svn merge ^/branches/released .

1 files changed, 2007 insertions, 2008 deletions

diff --git a/mesalib/src/mesa/main/renderbuffer.c b/mesalib/src/mesa/main/renderbuffer.c
index adc1199d8..ddc2fe30d 100644
--- a/mesalib/src/mesa/main/renderbuffer.c
+++ b/mesalib/src/mesa/main/renderbuffer.c
@@ -1,2008 +1,2007 @@
-/*
- * Mesa 3-D graphics library
- * Version:  6.5
- *
- * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included
- * in all copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
- * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-
-
-/**
- * Functions for allocating/managing renderbuffers.
- * Also, routines for reading/writing software-based renderbuffer data as
- * ubytes, ushorts, uints, etc.
- *
- * The 'alpha8' renderbuffer is interesting.  It's used to add a software-based
- * alpha channel to RGB renderbuffers.  This is done by wrapping the RGB
- * renderbuffer with the alpha renderbuffer.  We can do this because of the
- * OO-nature of renderbuffers.
- *
- * Down the road we'll use this for run-time support of 8, 16 and 32-bit
- * color channels.  For example, Mesa may use 32-bit/float color channels
- * internally (swrast) and use wrapper renderbuffers to convert 32-bit
- * values down to 16 or 8-bit values for whatever kind of framebuffer we have.
- */
-
-
-#include "glheader.h"
-#include "imports.h"
-#include "context.h"
-#include "fbobject.h"
-#include "formats.h"
-#include "mtypes.h"
-#include "fbobject.h"
-#include "renderbuffer.h"
-
-
-/*
- * Routines for get/put values in common buffer formats follow.
- * Someday add support for arbitrary row stride to make them more
- * flexible.
- */
-
-/**********************************************************************
- * Functions for buffers of 1 X GLubyte values.
- * Typically stencil.
- */
-
-static void *
-get_pointer_ubyte(GLcontext *ctx, struct gl_renderbuffer *rb,
-                  GLint x, GLint y)
-{
-   if (!rb->Data)
-      return NULL;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   /* Can't assert rb->Format since these funcs may be used for serveral
-    * different formats (GL_ALPHA8, GL_STENCIL_INDEX8, etc).
-    */
-   return (GLubyte *) rb->Data + y * rb->Width + x;
-}
-
-
-static void
-get_row_ubyte(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-              GLint x, GLint y, void *values)
-{
-   const GLubyte *src = (const GLubyte *) rb->Data + y * rb->Width + x;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   memcpy(values, src, count * sizeof(GLubyte));
-}
-
-
-static void
-get_values_ubyte(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                 const GLint x[], const GLint y[], void *values)
-{
-   GLubyte *dst = (GLubyte *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   for (i = 0; i < count; i++) {
-      const GLubyte *src = (GLubyte *) rb->Data + y[i] * rb->Width + x[i];
-      dst[i] = *src;
-   }
-}
-
-
-static void
-put_row_ubyte(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-              GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   const GLubyte *src = (const GLubyte *) values;
-   GLubyte *dst = (GLubyte *) rb->Data + y * rb->Width + x;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i] = src[i];
-         }
-      }
-   }
-   else {
-      memcpy(dst, values, count * sizeof(GLubyte));
-   }
-}
-
-
-static void
-put_mono_row_ubyte(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                   GLint x, GLint y, const void *value, const GLubyte *mask)
-{
-   const GLubyte val = *((const GLubyte *) value);
-   GLubyte *dst = (GLubyte *) rb->Data + y * rb->Width + x;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i] = val;
-         }
-      }
-   }
-   else {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         dst[i] = val;
-      }
-   }
-}
-
-
-static void
-put_values_ubyte(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                 const GLint x[], const GLint y[],
-                 const void *values, const GLubyte *mask)
-{
-   const GLubyte *src = (const GLubyte *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLubyte *dst = (GLubyte *) rb->Data + y[i] * rb->Width + x[i];
-         *dst = src[i];
-      }
-   }
-}
-
-
-static void
-put_mono_values_ubyte(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                      const GLint x[], const GLint y[],
-                      const void *value, const GLubyte *mask)
-{
-   const GLubyte val = *((const GLubyte *) value);
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLubyte *dst = (GLubyte *) rb->Data + y[i] * rb->Width + x[i];
-         *dst = val;
-      }
-   }
-}
-
-
-/**********************************************************************
- * Functions for buffers of 1 X GLushort values.
- * Typically depth/Z.
- */
-
-static void *
-get_pointer_ushort(GLcontext *ctx, struct gl_renderbuffer *rb,
-                   GLint x, GLint y)
-{
-   if (!rb->Data)
-      return NULL;
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);
-   ASSERT(rb->Width > 0);
-   return (GLushort *) rb->Data + y * rb->Width + x;
-}
-
-
-static void
-get_row_ushort(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-               GLint x, GLint y, void *values)
-{
-   const void *src = rb->GetPointer(ctx, rb, x, y);
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);
-   memcpy(values, src, count * sizeof(GLushort));
-}
-
-
-static void
-get_values_ushort(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                  const GLint x[], const GLint y[], void *values)
-{
-   GLushort *dst = (GLushort *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);
-   for (i = 0; i < count; i++) {
-      const GLushort *src = (GLushort *) rb->Data + y[i] * rb->Width + x[i];
-      dst[i] = *src;
-   }
-}
-
-
-static void
-put_row_ushort(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-               GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   const GLushort *src = (const GLushort *) values;
-   GLushort *dst = (GLushort *) rb->Data + y * rb->Width + x;
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i] = src[i];
-         }
-      }
-   }
-   else {
-      memcpy(dst, src, count * sizeof(GLushort));
-   }
-}
-
-
-static void
-put_mono_row_ushort(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                    GLint x, GLint y, const void *value, const GLubyte *mask)
-{
-   const GLushort val = *((const GLushort *) value);
-   GLushort *dst = (GLushort *) rb->Data + y * rb->Width + x;
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i] = val;
-         }
-      }
-   }
-   else {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         dst[i] = val;
-      }
-   }
-}
-
-
-static void
-put_values_ushort(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                  const GLint x[], const GLint y[], const void *values,
-                  const GLubyte *mask)
-{
-   const GLushort *src = (const GLushort *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLushort *dst = (GLushort *) rb->Data + y[i] * rb->Width + x[i];
-         *dst = src[i];
-      }
-   }
-}
- 
-
-static void
-put_mono_values_ushort(GLcontext *ctx, struct gl_renderbuffer *rb,
-                       GLuint count, const GLint x[], const GLint y[],
-                       const void *value, const GLubyte *mask)
-{
-   const GLushort val = *((const GLushort *) value);
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            GLushort *dst = (GLushort *) rb->Data + y[i] * rb->Width + x[i];
-            *dst = val;
-         }
-      }
-   }
-   else {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         GLushort *dst = (GLushort *) rb->Data + y[i] * rb->Width + x[i];
-         *dst = val;
-      }
-   }
-}
- 
-
-/**********************************************************************
- * Functions for buffers of 1 X GLuint values.
- * Typically depth/Z or color index.
- */
-
-static void *
-get_pointer_uint(GLcontext *ctx, struct gl_renderbuffer *rb,
-                 GLint x, GLint y)
-{
-   if (!rb->Data)
-      return NULL;
-   ASSERT(rb->DataType == GL_UNSIGNED_INT ||
-          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);
-   return (GLuint *) rb->Data + y * rb->Width + x;
-}
-
-
-static void
-get_row_uint(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-             GLint x, GLint y, void *values)
-{
-   const void *src = rb->GetPointer(ctx, rb, x, y);
-   ASSERT(rb->DataType == GL_UNSIGNED_INT ||
-          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);
-   memcpy(values, src, count * sizeof(GLuint));
-}
-
-
-static void
-get_values_uint(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                const GLint x[], const GLint y[], void *values)
-{
-   GLuint *dst = (GLuint *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_INT ||
-          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);
-   for (i = 0; i < count; i++) {
-      const GLuint *src = (GLuint *) rb->Data + y[i] * rb->Width + x[i];
-      dst[i] = *src;
-   }
-}
-
-
-static void
-put_row_uint(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-             GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   const GLuint *src = (const GLuint *) values;
-   GLuint *dst = (GLuint *) rb->Data + y * rb->Width + x;
-   ASSERT(rb->DataType == GL_UNSIGNED_INT ||
-          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i] = src[i];
-         }
-      }
-   }
-   else {
-      memcpy(dst, src, count * sizeof(GLuint));
-   }
-}
-
-
-static void
-put_mono_row_uint(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                  GLint x, GLint y, const void *value, const GLubyte *mask)
-{
-   const GLuint val = *((const GLuint *) value);
-   GLuint *dst = (GLuint *) rb->Data + y * rb->Width + x;
-   ASSERT(rb->DataType == GL_UNSIGNED_INT ||
-          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i] = val;
-         }
-      }
-   }
-   else {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         dst[i] = val;
-      }
-   }
-}
-
-
-static void
-put_values_uint(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                const GLint x[], const GLint y[], const void *values,
-                const GLubyte *mask)
-{
-   const GLuint *src = (const GLuint *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_INT ||
-          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLuint *dst = (GLuint *) rb->Data + y[i] * rb->Width + x[i];
-         *dst = src[i];
-      }
-   }
-}
-
-
-static void
-put_mono_values_uint(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                     const GLint x[], const GLint y[], const void *value,
-                     const GLubyte *mask)
-{
-   const GLuint val = *((const GLuint *) value);
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_INT ||
-          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLuint *dst = (GLuint *) rb->Data + y[i] * rb->Width + x[i];
-         *dst = val;
-      }
-   }
-}
-
-
-/**********************************************************************
- * Functions for buffers of 3 X GLubyte (or GLbyte) values.
- * Typically color buffers.
- * NOTE: the incoming and outgoing colors are RGBA!  We ignore incoming
- * alpha values and return 255 for outgoing alpha values.
- */
-
-static void *
-get_pointer_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb,
-                   GLint x, GLint y)
-{
-   ASSERT(rb->Format == MESA_FORMAT_RGB888);
-   /* No direct access since this buffer is RGB but caller will be
-    * treating it as if it were RGBA.
-    */
-   return NULL;
-}
-
-
-static void
-get_row_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-               GLint x, GLint y, void *values)
-{
-   const GLubyte *src = (const GLubyte *) rb->Data + 3 * (y * rb->Width + x);
-   GLubyte *dst = (GLubyte *) values;
-   GLuint i;
-   ASSERT(rb->Format == MESA_FORMAT_RGB888);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   for (i = 0; i < count; i++) {
-      dst[i * 4 + 0] = src[i * 3 + 0];
-      dst[i * 4 + 1] = src[i * 3 + 1];
-      dst[i * 4 + 2] = src[i * 3 + 2];
-      dst[i * 4 + 3] = 255;
-   }
-}
-
-
-static void
-get_values_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                  const GLint x[], const GLint y[], void *values)
-{
-   GLubyte *dst = (GLubyte *) values;
-   GLuint i;
-   ASSERT(rb->Format == MESA_FORMAT_RGB888);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   for (i = 0; i < count; i++) {
-      const GLubyte *src
-         = (GLubyte *) rb->Data + 3 * (y[i] * rb->Width + x[i]);
-      dst[i * 4 + 0] = src[0];
-      dst[i * 4 + 1] = src[1];
-      dst[i * 4 + 2] = src[2];
-      dst[i * 4 + 3] = 255;
-   }
-}
-
-
-static void
-put_row_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-               GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   /* note: incoming values are RGB+A! */
-   const GLubyte *src = (const GLubyte *) values;
-   GLubyte *dst = (GLubyte *) rb->Data + 3 * (y * rb->Width + x);
-   GLuint i;
-   ASSERT(rb->Format == MESA_FORMAT_RGB888);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         dst[i * 3 + 0] = src[i * 4 + 0];
-         dst[i * 3 + 1] = src[i * 4 + 1];
-         dst[i * 3 + 2] = src[i * 4 + 2];
-      }
-   }
-}
-
-
-static void
-put_row_rgb_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                   GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   /* note: incoming values are RGB+A! */
-   const GLubyte *src = (const GLubyte *) values;
-   GLubyte *dst = (GLubyte *) rb->Data + 3 * (y * rb->Width + x);
-   GLuint i;
-   ASSERT(rb->Format == MESA_FORMAT_RGB888);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         dst[i * 3 + 0] = src[i * 3 + 0];
-         dst[i * 3 + 1] = src[i * 3 + 1];
-         dst[i * 3 + 2] = src[i * 3 + 2];
-      }
-   }
-}
-
-
-static void
-put_mono_row_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                    GLint x, GLint y, const void *value, const GLubyte *mask)
-{
-   /* note: incoming value is RGB+A! */
-   const GLubyte val0 = ((const GLubyte *) value)[0];
-   const GLubyte val1 = ((const GLubyte *) value)[1];
-   const GLubyte val2 = ((const GLubyte *) value)[2];
-   GLubyte *dst = (GLubyte *) rb->Data + 3 * (y * rb->Width + x);
-   ASSERT(rb->Format == MESA_FORMAT_RGB888);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   if (!mask && val0 == val1 && val1 == val2) {
-      /* optimized case */
-      memset(dst, val0, 3 * count);
-   }
-   else {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (!mask || mask[i]) {
-            dst[i * 3 + 0] = val0;
-            dst[i * 3 + 1] = val1;
-            dst[i * 3 + 2] = val2;
-         }
-      }
-   }
-}
-
-
-static void
-put_values_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                  const GLint x[], const GLint y[], const void *values,
-                  const GLubyte *mask)
-{
-   /* note: incoming values are RGB+A! */
-   const GLubyte *src = (const GLubyte *) values;
-   GLuint i;
-   ASSERT(rb->Format == MESA_FORMAT_RGB888);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLubyte *dst = (GLubyte *) rb->Data + 3 * (y[i] * rb->Width + x[i]);
-         dst[0] = src[i * 4 + 0];
-         dst[1] = src[i * 4 + 1];
-         dst[2] = src[i * 4 + 2];
-      }
-   }
-}
-
-
-static void
-put_mono_values_ubyte3(GLcontext *ctx, struct gl_renderbuffer *rb,
-                       GLuint count, const GLint x[], const GLint y[],
-                       const void *value, const GLubyte *mask)
-{
-   /* note: incoming value is RGB+A! */
-   const GLubyte val0 = ((const GLubyte *) value)[0];
-   const GLubyte val1 = ((const GLubyte *) value)[1];
-   const GLubyte val2 = ((const GLubyte *) value)[2];
-   GLuint i;
-   ASSERT(rb->Format == MESA_FORMAT_RGB888);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLubyte *dst = (GLubyte *) rb->Data + 3 * (y[i] * rb->Width + x[i]);
-         dst[0] = val0;
-         dst[1] = val1;
-         dst[2] = val2;
-      }
-   }
-}
-
-
-/**********************************************************************
- * Functions for buffers of 4 X GLubyte (or GLbyte) values.
- * Typically color buffers.
- */
-
-static void *
-get_pointer_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb,
-                   GLint x, GLint y)
-{
-   if (!rb->Data)
-      return NULL;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);
-   return (GLubyte *) rb->Data + 4 * (y * rb->Width + x);
-}
-
-
-static void
-get_row_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-               GLint x, GLint y, void *values)
-{
-   const GLubyte *src = (const GLubyte *) rb->Data + 4 * (y * rb->Width + x);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);
-   memcpy(values, src, 4 * count * sizeof(GLubyte));
-}
-
-
-static void
-get_values_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                  const GLint x[], const GLint y[], void *values)
-{
-   /* treat 4*GLubyte as 1*GLuint */
-   GLuint *dst = (GLuint *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);
-   for (i = 0; i < count; i++) {
-      const GLuint *src = (GLuint *) rb->Data + (y[i] * rb->Width + x[i]);
-      dst[i] = *src;
-   }
-}
-
-
-static void
-put_row_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-               GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   /* treat 4*GLubyte as 1*GLuint */
-   const GLuint *src = (const GLuint *) values;
-   GLuint *dst = (GLuint *) rb->Data + (y * rb->Width + x);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i] = src[i];
-         }
-      }
-   }
-   else {
-      memcpy(dst, src, 4 * count * sizeof(GLubyte));
-   }
-}
-
-
-static void
-put_row_rgb_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                   GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   /* Store RGB values in RGBA buffer */
-   const GLubyte *src = (const GLubyte *) values;
-   GLubyte *dst = (GLubyte *) rb->Data + 4 * (y * rb->Width + x);
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         dst[i * 4 + 0] = src[i * 3 + 0];
-         dst[i * 4 + 1] = src[i * 3 + 1];
-         dst[i * 4 + 2] = src[i * 3 + 2];
-         dst[i * 4 + 3] = 0xff;
-      }
-   }
-}
-
-
-static void
-put_mono_row_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                    GLint x, GLint y, const void *value, const GLubyte *mask)
-{
-   /* treat 4*GLubyte as 1*GLuint */
-   const GLuint val = *((const GLuint *) value);
-   GLuint *dst = (GLuint *) rb->Data + (y * rb->Width + x);
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);
-   if (!mask && val == 0) {
-      /* common case */
-      memset(dst, 0, count * 4 * sizeof(GLubyte));
-   }
-   else {
-      /* general case */
-      if (mask) {
-         GLuint i;
-         for (i = 0; i < count; i++) {
-            if (mask[i]) {
-               dst[i] = val;
-            }
-         }
-      }
-      else {
-         GLuint i;
-         for (i = 0; i < count; i++) {
-            dst[i] = val;
-         }
-      }
-   }
-}
-
-
-static void
-put_values_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                  const GLint x[], const GLint y[], const void *values,
-                  const GLubyte *mask)
-{
-   /* treat 4*GLubyte as 1*GLuint */
-   const GLuint *src = (const GLuint *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLuint *dst = (GLuint *) rb->Data + (y[i] * rb->Width + x[i]);
-         *dst = src[i];
-      }
-   }
-}
-
-
-static void
-put_mono_values_ubyte4(GLcontext *ctx, struct gl_renderbuffer *rb,
-                       GLuint count, const GLint x[], const GLint y[],
-                       const void *value, const GLubyte *mask)
-{
-   /* treat 4*GLubyte as 1*GLuint */
-   const GLuint val = *((const GLuint *) value);
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);
-   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLuint *dst = (GLuint *) rb->Data + (y[i] * rb->Width + x[i]);
-         *dst = val;
-      }
-   }
-}
-
-
-/**********************************************************************
- * Functions for buffers of 4 X GLushort (or GLshort) values.
- * Typically accum buffer.
- */
-
-static void *
-get_pointer_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb,
-                    GLint x, GLint y)
-{
-   if (!rb->Data)
-      return NULL;
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
-   return (GLushort *) rb->Data + 4 * (y * rb->Width + x);
-}
-
-
-static void
-get_row_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                GLint x, GLint y, void *values)
-{
-   const GLshort *src = (const GLshort *) rb->Data + 4 * (y * rb->Width + x);
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
-   memcpy(values, src, 4 * count * sizeof(GLshort));
-}
-
-
-static void
-get_values_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                   const GLint x[], const GLint y[], void *values)
-{
-   GLushort *dst = (GLushort *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
-   for (i = 0; i < count; i++) {
-      const GLushort *src
-         = (GLushort *) rb->Data + 4 * (y[i] * rb->Width + x[i]);
-      dst[i] = *src;
-   }
-}
-
-
-static void
-put_row_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   const GLushort *src = (const GLushort *) values;
-   GLushort *dst = (GLushort *) rb->Data + 4 * (y * rb->Width + x);
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i * 4 + 0] = src[i * 4 + 0];
-            dst[i * 4 + 1] = src[i * 4 + 1];
-            dst[i * 4 + 2] = src[i * 4 + 2];
-            dst[i * 4 + 3] = src[i * 4 + 3];
-         }
-      }
-   }
-   else {
-      memcpy(dst, src, 4 * count * sizeof(GLushort));
-   }
-}
-
-
-static void
-put_row_rgb_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                    GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   /* Put RGB values in RGBA buffer */
-   const GLushort *src = (const GLushort *) values;
-   GLushort *dst = (GLushort *) rb->Data + 4 * (y * rb->Width + x);
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i * 4 + 0] = src[i * 3 + 0];
-            dst[i * 4 + 1] = src[i * 3 + 1];
-            dst[i * 4 + 2] = src[i * 3 + 2];
-            dst[i * 4 + 3] = 0xffff;
-         }
-      }
-   }
-   else {
-      memcpy(dst, src, 4 * count * sizeof(GLushort));
-   }
-}
-
-
-static void
-put_mono_row_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                     GLint x, GLint y, const void *value, const GLubyte *mask)
-{
-   const GLushort val0 = ((const GLushort *) value)[0];
-   const GLushort val1 = ((const GLushort *) value)[1];
-   const GLushort val2 = ((const GLushort *) value)[2];
-   const GLushort val3 = ((const GLushort *) value)[3];
-   GLushort *dst = (GLushort *) rb->Data + 4 * (y * rb->Width + x);
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
-   if (!mask && val0 == 0 && val1 == 0 && val2 == 0 && val3 == 0) {
-      /* common case for clearing accum buffer */
-      memset(dst, 0, count * 4 * sizeof(GLushort));
-   }
-   else {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (!mask || mask[i]) {
-            dst[i * 4 + 0] = val0;
-            dst[i * 4 + 1] = val1;
-            dst[i * 4 + 2] = val2;
-            dst[i * 4 + 3] = val3;
-         }
-      }
-   }
-}
-
-
-static void
-put_values_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb, GLuint count,
-                   const GLint x[], const GLint y[], const void *values,
-                   const GLubyte *mask)
-{
-   const GLushort *src = (const GLushort *) values;
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLushort *dst = (GLushort *) rb->Data + 4 * (y[i] * rb->Width + x[i]);
-         dst[0] = src[i * 4 + 0];
-         dst[1] = src[i * 4 + 1];
-         dst[2] = src[i * 4 + 2];
-         dst[3] = src[i * 4 + 3];
-      }
-   }
-}
-
-
-static void
-put_mono_values_ushort4(GLcontext *ctx, struct gl_renderbuffer *rb,
-                        GLuint count, const GLint x[], const GLint y[],
-                        const void *value, const GLubyte *mask)
-{
-   const GLushort val0 = ((const GLushort *) value)[0];
-   const GLushort val1 = ((const GLushort *) value)[1];
-   const GLushort val2 = ((const GLushort *) value)[2];
-   const GLushort val3 = ((const GLushort *) value)[3];
-   GLuint i;
-   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLushort *dst = (GLushort *) rb->Data + 4 * (y[i] * rb->Width + x[i]);
-         dst[0] = val0;
-         dst[1] = val1;
-         dst[2] = val2;
-         dst[3] = val3;
-      }
-   }
-}
-
-
-
-/**
- * This is a software fallback for the gl_renderbuffer->AllocStorage
- * function.
- * Device drivers will typically override this function for the buffers
- * which it manages (typically color buffers, Z and stencil).
- * Other buffers (like software accumulation and aux buffers) which the driver
- * doesn't manage can be handled with this function.
- *
- * This one multi-purpose function can allocate stencil, depth, accum, color
- * or color-index buffers!
- *
- * This function also plugs in the appropriate GetPointer, Get/PutRow and
- * Get/PutValues functions.
- */
-GLboolean
-_mesa_soft_renderbuffer_storage(GLcontext *ctx, struct gl_renderbuffer *rb,
-                                GLenum internalFormat,
-                                GLuint width, GLuint height)
-{
-   GLuint pixelSize;
-
-   switch (internalFormat) {
-   case GL_RGB:
-   case GL_R3_G3_B2:
-   case GL_RGB4:
-   case GL_RGB5:
-   case GL_RGB8:
-   case GL_RGB10:
-   case GL_RGB12:
-   case GL_RGB16:
-      rb->Format = MESA_FORMAT_RGB888;
-      rb->DataType = GL_UNSIGNED_BYTE;
-      rb->GetPointer = get_pointer_ubyte3;
-      rb->GetRow = get_row_ubyte3;
-      rb->GetValues = get_values_ubyte3;
-      rb->PutRow = put_row_ubyte3;
-      rb->PutRowRGB = put_row_rgb_ubyte3;
-      rb->PutMonoRow = put_mono_row_ubyte3;
-      rb->PutValues = put_values_ubyte3;
-      rb->PutMonoValues = put_mono_values_ubyte3;
-      pixelSize = 3 * sizeof(GLubyte);
-      break;
-   case GL_RGBA:
-   case GL_RGBA2:
-   case GL_RGBA4:
-   case GL_RGB5_A1:
-   case GL_RGBA8:
-#if 1
-   case GL_RGB10_A2:
-   case GL_RGBA12:
-#endif
-      rb->Format = MESA_FORMAT_RGBA8888;
-      rb->DataType = GL_UNSIGNED_BYTE;
-      rb->GetPointer = get_pointer_ubyte4;
-      rb->GetRow = get_row_ubyte4;
-      rb->GetValues = get_values_ubyte4;
-      rb->PutRow = put_row_ubyte4;
-      rb->PutRowRGB = put_row_rgb_ubyte4;
-      rb->PutMonoRow = put_mono_row_ubyte4;
-      rb->PutValues = put_values_ubyte4;
-      rb->PutMonoValues = put_mono_values_ubyte4;
-      pixelSize = 4 * sizeof(GLubyte);
-      break;
-   case GL_RGBA16:
-   case GL_RGBA16_SNORM:
-      /* for accum buffer */
-      rb->Format = MESA_FORMAT_SIGNED_RGBA_16;
-      rb->DataType = GL_SHORT;
-      rb->GetPointer = get_pointer_ushort4;
-      rb->GetRow = get_row_ushort4;
-      rb->GetValues = get_values_ushort4;
-      rb->PutRow = put_row_ushort4;
-      rb->PutRowRGB = put_row_rgb_ushort4;
-      rb->PutMonoRow = put_mono_row_ushort4;
-      rb->PutValues = put_values_ushort4;
-      rb->PutMonoValues = put_mono_values_ushort4;
-      pixelSize = 4 * sizeof(GLushort);
-      break;
-#if 0
-   case GL_ALPHA8:
-      rb->Format = MESA_FORMAT_A8;
-      rb->DataType = GL_UNSIGNED_BYTE;
-      rb->GetPointer = get_pointer_alpha8;
-      rb->GetRow = get_row_alpha8;
-      rb->GetValues = get_values_alpha8;
-      rb->PutRow = put_row_alpha8;
-      rb->PutRowRGB = NULL;
-      rb->PutMonoRow = put_mono_row_alpha8;
-      rb->PutValues = put_values_alpha8;
-      rb->PutMonoValues = put_mono_values_alpha8;
-      pixelSize = sizeof(GLubyte);
-      break;
-#endif
-   case GL_STENCIL_INDEX:
-   case GL_STENCIL_INDEX1_EXT:
-   case GL_STENCIL_INDEX4_EXT:
-   case GL_STENCIL_INDEX8_EXT:
-   case GL_STENCIL_INDEX16_EXT:
-      rb->Format = MESA_FORMAT_S8;
-      rb->DataType = GL_UNSIGNED_BYTE;
-      rb->GetPointer = get_pointer_ubyte;
-      rb->GetRow = get_row_ubyte;
-      rb->GetValues = get_values_ubyte;
-      rb->PutRow = put_row_ubyte;
-      rb->PutRowRGB = NULL;
-      rb->PutMonoRow = put_mono_row_ubyte;
-      rb->PutValues = put_values_ubyte;
-      rb->PutMonoValues = put_mono_values_ubyte;
-      pixelSize = sizeof(GLubyte);
-      break;
-   case GL_DEPTH_COMPONENT:
-   case GL_DEPTH_COMPONENT16:
-      rb->Format = MESA_FORMAT_Z16;
-      rb->DataType = GL_UNSIGNED_SHORT;
-      rb->GetPointer = get_pointer_ushort;
-      rb->GetRow = get_row_ushort;
-      rb->GetValues = get_values_ushort;
-      rb->PutRow = put_row_ushort;
-      rb->PutRowRGB = NULL;
-      rb->PutMonoRow = put_mono_row_ushort;
-      rb->PutValues = put_values_ushort;
-      rb->PutMonoValues = put_mono_values_ushort;
-      pixelSize = sizeof(GLushort);
-      break;
-   case GL_DEPTH_COMPONENT24:
-      rb->DataType = GL_UNSIGNED_INT;
-      rb->GetPointer = get_pointer_uint;
-      rb->GetRow = get_row_uint;
-      rb->GetValues = get_values_uint;
-      rb->PutRow = put_row_uint;
-      rb->PutRowRGB = NULL;
-      rb->PutMonoRow = put_mono_row_uint;
-      rb->PutValues = put_values_uint;
-      rb->PutMonoValues = put_mono_values_uint;
-      rb->Format = MESA_FORMAT_X8_Z24;
-      pixelSize = sizeof(GLuint);
-      break;
-   case GL_DEPTH_COMPONENT32:
-      rb->DataType = GL_UNSIGNED_INT;
-      rb->GetPointer = get_pointer_uint;
-      rb->GetRow = get_row_uint;
-      rb->GetValues = get_values_uint;
-      rb->PutRow = put_row_uint;
-      rb->PutRowRGB = NULL;
-      rb->PutMonoRow = put_mono_row_uint;
-      rb->PutValues = put_values_uint;
-      rb->PutMonoValues = put_mono_values_uint;
-      rb->Format = MESA_FORMAT_Z32;
-      pixelSize = sizeof(GLuint);
-      break;
-   case GL_DEPTH_STENCIL_EXT:
-   case GL_DEPTH24_STENCIL8_EXT:
-      rb->Format = MESA_FORMAT_Z24_S8;
-      rb->DataType = GL_UNSIGNED_INT_24_8_EXT;
-      rb->GetPointer = get_pointer_uint;
-      rb->GetRow = get_row_uint;
-      rb->GetValues = get_values_uint;
-      rb->PutRow = put_row_uint;
-      rb->PutRowRGB = NULL;
-      rb->PutMonoRow = put_mono_row_uint;
-      rb->PutValues = put_values_uint;
-      rb->PutMonoValues = put_mono_values_uint;
-      pixelSize = sizeof(GLuint);
-      break;
-   default:
-      _mesa_problem(ctx, "Bad internalFormat in _mesa_soft_renderbuffer_storage");
-      return GL_FALSE;
-   }
-
-   ASSERT(rb->DataType);
-   ASSERT(rb->GetPointer);
-   ASSERT(rb->GetRow);
-   ASSERT(rb->GetValues);
-   ASSERT(rb->PutRow);
-   ASSERT(rb->PutMonoRow);
-   ASSERT(rb->PutValues);
-   ASSERT(rb->PutMonoValues);
-
-   /* free old buffer storage */
-   if (rb->Data) {
-      free(rb->Data);
-      rb->Data = NULL;
-   }
-
-   if (width > 0 && height > 0) {
-      /* allocate new buffer storage */
-      rb->Data = malloc(width * height * pixelSize);
-
-      if (rb->Data == NULL) {
-         rb->Width = 0;
-         rb->Height = 0;
-         _mesa_error(ctx, GL_OUT_OF_MEMORY,
-                     "software renderbuffer allocation (%d x %d x %d)",
-                     width, height, pixelSize);
-         return GL_FALSE;
-      }
-   }
-
-   rb->Width = width;
-   rb->Height = height;
-   rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);
-   ASSERT(rb->_BaseFormat);
-
-   return GL_TRUE;
-}
-
-
-
-/**********************************************************************/
-/**********************************************************************/
-/**********************************************************************/
-
-
-/**
- * Here we utilize the gl_renderbuffer->Wrapper field to put an alpha
- * buffer wrapper around an existing RGB renderbuffer (hw or sw).
- *
- * When PutRow is called (for example), we store the alpha values in
- * this buffer, then pass on the PutRow call to the wrapped RGB
- * buffer.
- */
-
-
-static GLboolean
-alloc_storage_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb,
-                     GLenum internalFormat, GLuint width, GLuint height)
-{
-   ASSERT(arb != arb->Wrapped);
-   ASSERT(arb->Format == MESA_FORMAT_A8);
-
-   /* first, pass the call to the wrapped RGB buffer */
-   if (!arb->Wrapped->AllocStorage(ctx, arb->Wrapped, internalFormat,
-                                  width, height)) {
-      return GL_FALSE;
-   }
-
-   /* next, resize my alpha buffer */
-   if (arb->Data) {
-      free(arb->Data);
-   }
-
-   arb->Data = malloc(width * height * sizeof(GLubyte));
-   if (arb->Data == NULL) {
-      arb->Width = 0;
-      arb->Height = 0;
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "software alpha buffer allocation");
-      return GL_FALSE;
-   }
-
-   arb->Width = width;
-   arb->Height = height;
-
-   return GL_TRUE;
-}
-
-
-/**
- * Delete an alpha_renderbuffer object, as well as the wrapped RGB buffer.
- */
-static void
-delete_renderbuffer_alpha8(struct gl_renderbuffer *arb)
-{
-   if (arb->Data) {
-      free(arb->Data);
-   }
-   ASSERT(arb->Wrapped);
-   ASSERT(arb != arb->Wrapped);
-   arb->Wrapped->Delete(arb->Wrapped);
-   arb->Wrapped = NULL;
-   free(arb);
-}
-
-
-static void *
-get_pointer_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb,
-                   GLint x, GLint y)
-{
-   return NULL;   /* don't allow direct access! */
-}
-
-
-static void
-get_row_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
-               GLint x, GLint y, void *values)
-{
-   /* NOTE: 'values' is RGBA format! */
-   const GLubyte *src = (const GLubyte *) arb->Data + y * arb->Width + x;
-   GLubyte *dst = (GLubyte *) values;
-   GLuint i;
-   ASSERT(arb != arb->Wrapped);
-   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
-   /* first, pass the call to the wrapped RGB buffer */
-   arb->Wrapped->GetRow(ctx, arb->Wrapped, count, x, y, values);
-   /* second, fill in alpha values from this buffer! */
-   for (i = 0; i < count; i++) {
-      dst[i * 4 + 3] = src[i];
-   }
-}
-
-
-static void
-get_values_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
-                  const GLint x[], const GLint y[], void *values)
-{
-   GLubyte *dst = (GLubyte *) values;
-   GLuint i;
-   ASSERT(arb != arb->Wrapped);
-   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
-   /* first, pass the call to the wrapped RGB buffer */
-   arb->Wrapped->GetValues(ctx, arb->Wrapped, count, x, y, values);
-   /* second, fill in alpha values from this buffer! */
-   for (i = 0; i < count; i++) {
-      const GLubyte *src = (GLubyte *) arb->Data + y[i] * arb->Width + x[i];
-      dst[i * 4 + 3] = *src;
-   }
-}
-
-
-static void
-put_row_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
-               GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   const GLubyte *src = (const GLubyte *) values;
-   GLubyte *dst = (GLubyte *) arb->Data + y * arb->Width + x;
-   GLuint i;
-   ASSERT(arb != arb->Wrapped);
-   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
-   /* first, pass the call to the wrapped RGB buffer */
-   arb->Wrapped->PutRow(ctx, arb->Wrapped, count, x, y, values, mask);
-   /* second, store alpha in our buffer */
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         dst[i] = src[i * 4 + 3];
-      }
-   }
-}
-
-
-static void
-put_row_rgb_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
-                   GLint x, GLint y, const void *values, const GLubyte *mask)
-{
-   const GLubyte *src = (const GLubyte *) values;
-   GLubyte *dst = (GLubyte *) arb->Data + y * arb->Width + x;
-   GLuint i;
-   ASSERT(arb != arb->Wrapped);
-   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
-   /* first, pass the call to the wrapped RGB buffer */
-   arb->Wrapped->PutRowRGB(ctx, arb->Wrapped, count, x, y, values, mask);
-   /* second, store alpha in our buffer */
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         dst[i] = src[i * 4 + 3];
-      }
-   }
-}
-
-
-static void
-put_mono_row_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
-                    GLint x, GLint y, const void *value, const GLubyte *mask)
-{
-   const GLubyte val = ((const GLubyte *) value)[3];
-   GLubyte *dst = (GLubyte *) arb->Data + y * arb->Width + x;
-   ASSERT(arb != arb->Wrapped);
-   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
-   /* first, pass the call to the wrapped RGB buffer */
-   arb->Wrapped->PutMonoRow(ctx, arb->Wrapped, count, x, y, value, mask);
-   /* second, store alpha in our buffer */
-   if (mask) {
-      GLuint i;
-      for (i = 0; i < count; i++) {
-         if (mask[i]) {
-            dst[i] = val;
-         }
-      }
-   }
-   else {
-      memset(dst, val, count);
-   }
-}
-
-
-static void
-put_values_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb, GLuint count,
-                  const GLint x[], const GLint y[],
-                  const void *values, const GLubyte *mask)
-{
-   const GLubyte *src = (const GLubyte *) values;
-   GLuint i;
-   ASSERT(arb != arb->Wrapped);
-   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
-   /* first, pass the call to the wrapped RGB buffer */
-   arb->Wrapped->PutValues(ctx, arb->Wrapped, count, x, y, values, mask);
-   /* second, store alpha in our buffer */
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLubyte *dst = (GLubyte *) arb->Data + y[i] * arb->Width + x[i];
-         *dst = src[i * 4 + 3];
-      }
-   }
-}
-
-
-static void
-put_mono_values_alpha8(GLcontext *ctx, struct gl_renderbuffer *arb,
-                       GLuint count, const GLint x[], const GLint y[],
-                       const void *value, const GLubyte *mask)
-{
-   const GLubyte val = ((const GLubyte *) value)[3];
-   GLuint i;
-   ASSERT(arb != arb->Wrapped);
-   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);
-   /* first, pass the call to the wrapped RGB buffer */
-   arb->Wrapped->PutValues(ctx, arb->Wrapped, count, x, y, value, mask);
-   /* second, store alpha in our buffer */
-   for (i = 0; i < count; i++) {
-      if (!mask || mask[i]) {
-         GLubyte *dst = (GLubyte *) arb->Data + y[i] * arb->Width + x[i];
-         *dst = val;
-      }
-   }
-}
-
-
-static void
-copy_buffer_alpha8(struct gl_renderbuffer* dst, struct gl_renderbuffer* src)
-{
-   ASSERT(dst->Format == MESA_FORMAT_A8);
-   ASSERT(src->Format == MESA_FORMAT_A8);
-   ASSERT(dst->Width == src->Width);
-   ASSERT(dst->Height == src->Height);
-
-   memcpy(dst->Data, src->Data, dst->Width * dst->Height * sizeof(GLubyte));
-}
-
-
-/**********************************************************************/
-/**********************************************************************/
-/**********************************************************************/
-
-
-/**
- * Default GetPointer routine.  Always return NULL to indicate that
- * direct buffer access is not supported.
- */
-static void *
-nop_get_pointer(GLcontext *ctx, struct gl_renderbuffer *rb, GLint x, GLint y)
-{
-   return NULL;
-}
-
-
-/**
- * Initialize the fields of a gl_renderbuffer to default values.
- */
-void
-_mesa_init_renderbuffer(struct gl_renderbuffer *rb, GLuint name)
-{
-   _glthread_INIT_MUTEX(rb->Mutex);
-
-   rb->Magic = RB_MAGIC;
-   rb->ClassID = 0;
-   rb->Name = name;
-   rb->RefCount = 0;
-   rb->Delete = _mesa_delete_renderbuffer;
-
-   /* The rest of these should be set later by the caller of this function or
-    * the AllocStorage method:
-    */
-   rb->AllocStorage = NULL;
-
-   rb->Width = 0;
-   rb->Height = 0;
-   rb->InternalFormat = GL_NONE;
-   rb->Format = MESA_FORMAT_NONE;
-
-   rb->DataType = GL_NONE;
-   rb->Data = NULL;
-
-   /* Point back to ourself so that we don't have to check for Wrapped==NULL
-    * all over the drivers.
-    */
-   rb->Wrapped = rb;
-
-   rb->GetPointer = nop_get_pointer;
-   rb->GetRow = NULL;
-   rb->GetValues = NULL;
-   rb->PutRow = NULL;
-   rb->PutRowRGB = NULL;
-   rb->PutMonoRow = NULL;
-   rb->PutValues = NULL;
-   rb->PutMonoValues = NULL;
-}
-
-
-/**
- * Allocate a new gl_renderbuffer object.  This can be used for user-created
- * renderbuffers or window-system renderbuffers.
- */
-struct gl_renderbuffer *
-_mesa_new_renderbuffer(GLcontext *ctx, GLuint name)
-{
-   struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);
-   if (rb) {
-      _mesa_init_renderbuffer(rb, name);
-   }
-   return rb;
-}
-
-
-/**
- * Delete a gl_framebuffer.
- * This is the default function for renderbuffer->Delete().
- */
-void
-_mesa_delete_renderbuffer(struct gl_renderbuffer *rb)
-{
-   if (rb->Data) {
-      free(rb->Data);
-   }
-   free(rb);
-}
-
-
-/**
- * Allocate a software-based renderbuffer.  This is called via the
- * ctx->Driver.NewRenderbuffer() function when the user creates a new
- * renderbuffer.
- * This would not be used for hardware-based renderbuffers.
- */
-struct gl_renderbuffer *
-_mesa_new_soft_renderbuffer(GLcontext *ctx, GLuint name)
-{
-   struct gl_renderbuffer *rb = _mesa_new_renderbuffer(ctx, name);
-   if (rb) {
-      rb->AllocStorage = _mesa_soft_renderbuffer_storage;
-      /* Normally, one would setup the PutRow, GetRow, etc functions here.
-       * But we're doing that in the _mesa_soft_renderbuffer_storage() function
-       * instead.
-       */
-   }
-   return rb;
-}
-
-
-/**
- * Add software-based color renderbuffers to the given framebuffer.
- * This is a helper routine for device drivers when creating a
- * window system framebuffer (not a user-created render/framebuffer).
- * Once this function is called, you can basically forget about this
- * renderbuffer; core Mesa will handle all the buffer management and
- * rendering!
- */
-GLboolean
-_mesa_add_color_renderbuffers(GLcontext *ctx, struct gl_framebuffer *fb,
-                              GLuint rgbBits, GLuint alphaBits,
-                              GLboolean frontLeft, GLboolean backLeft,
-                              GLboolean frontRight, GLboolean backRight)
-{
-   GLuint b;
-
-   if (rgbBits > 16 || alphaBits > 16) {
-      _mesa_problem(ctx,
-                    "Unsupported bit depth in _mesa_add_color_renderbuffers");
-      return GL_FALSE;
-   }
-
-   assert(MAX_COLOR_ATTACHMENTS >= 4);
-
-   for (b = BUFFER_FRONT_LEFT; b <= BUFFER_BACK_RIGHT; b++) {
-      struct gl_renderbuffer *rb;
-
-      if (b == BUFFER_FRONT_LEFT && !frontLeft)
-         continue;
-      else if (b == BUFFER_BACK_LEFT && !backLeft)
-         continue;
-      else if (b == BUFFER_FRONT_RIGHT && !frontRight)
-         continue;
-      else if (b == BUFFER_BACK_RIGHT && !backRight)
-         continue;
-
-      assert(fb->Attachment[b].Renderbuffer == NULL);
-
-      rb = _mesa_new_renderbuffer(ctx, 0);
-      if (!rb) {
-         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating color buffer");
-         return GL_FALSE;
-      }
-
-      if (rgbBits <= 8) {
-         if (alphaBits)
-            rb->Format = MESA_FORMAT_RGBA8888;
-         else
-            rb->Format = MESA_FORMAT_RGB888;
-      }
-      else {
-         assert(rgbBits <= 16);
-         rb->Format = MESA_FORMAT_NONE; /*XXX RGBA16;*/
-      }
-      rb->InternalFormat = GL_RGBA;
-
-      rb->AllocStorage = _mesa_soft_renderbuffer_storage;
-      _mesa_add_renderbuffer(fb, b, rb);
-   }
-
-   return GL_TRUE;
-}
-
-
-/**
- * Add software-based alpha renderbuffers to the given framebuffer.
- * This is a helper routine for device drivers when creating a
- * window system framebuffer (not a user-created render/framebuffer).
- * Once this function is called, you can basically forget about this
- * renderbuffer; core Mesa will handle all the buffer management and
- * rendering!
- */
-GLboolean
-_mesa_add_alpha_renderbuffers(GLcontext *ctx, struct gl_framebuffer *fb,
-                              GLuint alphaBits,
-                              GLboolean frontLeft, GLboolean backLeft,
-                              GLboolean frontRight, GLboolean backRight)
-{
-   GLuint b;
-
-   /* for window system framebuffers only! */
-   assert(fb->Name == 0);
-
-   if (alphaBits > 8) {
-      _mesa_problem(ctx,
-                    "Unsupported bit depth in _mesa_add_alpha_renderbuffers");
-      return GL_FALSE;
-   }
-
-   assert(MAX_COLOR_ATTACHMENTS >= 4);
-
-   /* Wrap each of the RGB color buffers with an alpha renderbuffer.
-    */
-   for (b = BUFFER_FRONT_LEFT; b <= BUFFER_BACK_RIGHT; b++) {
-      struct gl_renderbuffer *arb;
-
-      if (b == BUFFER_FRONT_LEFT && !frontLeft)
-         continue;
-      else if (b == BUFFER_BACK_LEFT && !backLeft)
-         continue;
-      else if (b == BUFFER_FRONT_RIGHT && !frontRight)
-         continue;
-      else if (b == BUFFER_BACK_RIGHT && !backRight)
-         continue;
-
-      /* the RGB buffer to wrap must already exist!! */
-      assert(fb->Attachment[b].Renderbuffer);
-
-      /* only GLubyte supported for now */
-      assert(fb->Attachment[b].Renderbuffer->DataType == GL_UNSIGNED_BYTE);
-
-      /* allocate alpha renderbuffer */
-      arb = _mesa_new_renderbuffer(ctx, 0);
-      if (!arb) {
-         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating alpha buffer");
-         return GL_FALSE;
-      }
-
-      /* wrap the alpha renderbuffer around the RGB renderbuffer */
-      arb->Wrapped = fb->Attachment[b].Renderbuffer;
-
-      /* Set up my alphabuffer fields and plug in my functions.
-       * The functions will put/get the alpha values from/to RGBA arrays
-       * and then call the wrapped buffer's functions to handle the RGB
-       * values.
-       */
-      arb->InternalFormat = arb->Wrapped->InternalFormat;
-      arb->Format         = MESA_FORMAT_A8;
-      arb->DataType       = arb->Wrapped->DataType;
-      arb->AllocStorage   = alloc_storage_alpha8;
-      arb->Delete         = delete_renderbuffer_alpha8;
-      arb->GetPointer     = get_pointer_alpha8;
-      arb->GetRow         = get_row_alpha8;
-      arb->GetValues      = get_values_alpha8;
-      arb->PutRow         = put_row_alpha8;
-      arb->PutRowRGB      = put_row_rgb_alpha8;
-      arb->PutMonoRow     = put_mono_row_alpha8;
-      arb->PutValues      = put_values_alpha8;
-      arb->PutMonoValues  = put_mono_values_alpha8;
-
-      /* clear the pointer to avoid assertion/sanity check failure later */
-      fb->Attachment[b].Renderbuffer = NULL;
-
-      /* plug the alpha renderbuffer into the colorbuffer attachment */
-      _mesa_add_renderbuffer(fb, b, arb);
-   }
-
-   return GL_TRUE;
-}
-
-
-/**
- * For framebuffers that use a software alpha channel wrapper
- * created by _mesa_add_alpha_renderbuffer or _mesa_add_soft_renderbuffers,
- * copy the back buffer alpha channel into the front buffer alpha channel.
- */
-void
-_mesa_copy_soft_alpha_renderbuffers(GLcontext *ctx, struct gl_framebuffer *fb)
-{
-   if (fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer &&
-       fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer)
-      copy_buffer_alpha8(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer,
-                         fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);
-
-
-   if (fb->Attachment[BUFFER_FRONT_RIGHT].Renderbuffer &&
-       fb->Attachment[BUFFER_BACK_RIGHT].Renderbuffer)
-      copy_buffer_alpha8(fb->Attachment[BUFFER_FRONT_RIGHT].Renderbuffer,
-                         fb->Attachment[BUFFER_BACK_RIGHT].Renderbuffer);
-}
-
-
-/**
- * Add a software-based depth renderbuffer to the given framebuffer.
- * This is a helper routine for device drivers when creating a
- * window system framebuffer (not a user-created render/framebuffer).
- * Once this function is called, you can basically forget about this
- * renderbuffer; core Mesa will handle all the buffer management and
- * rendering!
- */
-GLboolean
-_mesa_add_depth_renderbuffer(GLcontext *ctx, struct gl_framebuffer *fb,
-                             GLuint depthBits)
-{
-   struct gl_renderbuffer *rb;
-
-   if (depthBits > 32) {
-      _mesa_problem(ctx,
-                    "Unsupported depthBits in _mesa_add_depth_renderbuffer");
-      return GL_FALSE;
-   }
-
-   assert(fb->Attachment[BUFFER_DEPTH].Renderbuffer == NULL);
-
-   rb = _mesa_new_renderbuffer(ctx, 0);
-   if (!rb) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating depth buffer");
-      return GL_FALSE;
-   }
-
-   if (depthBits <= 16) {
-      rb->Format = MESA_FORMAT_Z16;
-      rb->InternalFormat = GL_DEPTH_COMPONENT16;
-   }
-   else if (depthBits <= 24) {
-      rb->Format = MESA_FORMAT_X8_Z24;
-      rb->InternalFormat = GL_DEPTH_COMPONENT24;
-   }
-   else {
-      rb->Format = MESA_FORMAT_Z32;
-      rb->InternalFormat = GL_DEPTH_COMPONENT32;
-   }
-
-   rb->AllocStorage = _mesa_soft_renderbuffer_storage;
-   _mesa_add_renderbuffer(fb, BUFFER_DEPTH, rb);
-
-   return GL_TRUE;
-}
-
-
-/**
- * Add a software-based stencil renderbuffer to the given framebuffer.
- * This is a helper routine for device drivers when creating a
- * window system framebuffer (not a user-created render/framebuffer).
- * Once this function is called, you can basically forget about this
- * renderbuffer; core Mesa will handle all the buffer management and
- * rendering!
- */
-GLboolean
-_mesa_add_stencil_renderbuffer(GLcontext *ctx, struct gl_framebuffer *fb,
-                               GLuint stencilBits)
-{
-   struct gl_renderbuffer *rb;
-
-   if (stencilBits > 16) {
-      _mesa_problem(ctx,
-                  "Unsupported stencilBits in _mesa_add_stencil_renderbuffer");
-      return GL_FALSE;
-   }
-
-   assert(fb->Attachment[BUFFER_STENCIL].Renderbuffer == NULL);
-
-   rb = _mesa_new_renderbuffer(ctx, 0);
-   if (!rb) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating stencil buffer");
-      return GL_FALSE;
-   }
-
-   assert(stencilBits <= 8);
-   rb->Format = MESA_FORMAT_S8;
-   rb->InternalFormat = GL_STENCIL_INDEX8;
-
-   rb->AllocStorage = _mesa_soft_renderbuffer_storage;
-   _mesa_add_renderbuffer(fb, BUFFER_STENCIL, rb);
-
-   return GL_TRUE;
-}
-
-
-/**
- * Add a software-based accumulation renderbuffer to the given framebuffer.
- * This is a helper routine for device drivers when creating a
- * window system framebuffer (not a user-created render/framebuffer).
- * Once this function is called, you can basically forget about this
- * renderbuffer; core Mesa will handle all the buffer management and
- * rendering!
- */
-GLboolean
-_mesa_add_accum_renderbuffer(GLcontext *ctx, struct gl_framebuffer *fb,
-                             GLuint redBits, GLuint greenBits,
-                             GLuint blueBits, GLuint alphaBits)
-{
-   struct gl_renderbuffer *rb;
-
-   if (redBits > 16 || greenBits > 16 || blueBits > 16 || alphaBits > 16) {
-      _mesa_problem(ctx,
-                    "Unsupported accumBits in _mesa_add_accum_renderbuffer");
-      return GL_FALSE;
-   }
-
-   assert(fb->Attachment[BUFFER_ACCUM].Renderbuffer == NULL);
-
-   rb = _mesa_new_renderbuffer(ctx, 0);
-   if (!rb) {
-      _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating accum buffer");
-      return GL_FALSE;
-   }
-
-   rb->Format = MESA_FORMAT_SIGNED_RGBA_16;
-   rb->InternalFormat = GL_RGBA16_SNORM;
-   rb->AllocStorage = _mesa_soft_renderbuffer_storage;
-   _mesa_add_renderbuffer(fb, BUFFER_ACCUM, rb);
-
-   return GL_TRUE;
-}
-
-
-
-/**
- * Add a software-based accumulation renderbuffer to the given framebuffer.
- * This is a helper routine for device drivers when creating a
- * window system framebuffer (not a user-created render/framebuffer).
- * Once this function is called, you can basically forget about this
- * renderbuffer; core Mesa will handle all the buffer management and
- * rendering!
- *
- * NOTE: color-index aux buffers not supported.
- */
-GLboolean
-_mesa_add_aux_renderbuffers(GLcontext *ctx, struct gl_framebuffer *fb,
-                            GLuint colorBits, GLuint numBuffers)
-{
-   GLuint i;
-
-   if (colorBits > 16) {
-      _mesa_problem(ctx,
-                    "Unsupported accumBits in _mesa_add_aux_renderbuffers");
-      return GL_FALSE;
-   }
-
-   assert(numBuffers <= MAX_AUX_BUFFERS);
-
-   for (i = 0; i < numBuffers; i++) {
-      struct gl_renderbuffer *rb = _mesa_new_renderbuffer(ctx, 0);
-
-      assert(fb->Attachment[BUFFER_AUX0 + i].Renderbuffer == NULL);
-
-      if (!rb) {
-         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating accum buffer");
-         return GL_FALSE;
-      }
-
-      assert (colorBits <= 8);
-      rb->Format = MESA_FORMAT_RGBA8888;
-      rb->InternalFormat = GL_RGBA;
-
-      rb->AllocStorage = _mesa_soft_renderbuffer_storage;
-      _mesa_add_renderbuffer(fb, BUFFER_AUX0 + i, rb);
-   }
-   return GL_TRUE;
-}
-
-
-/**
- * Create/attach software-based renderbuffers to the given framebuffer.
- * This is a helper routine for device drivers.  Drivers can just as well
- * call the individual _mesa_add_*_renderbuffer() routines directly.
- */
-void
-_mesa_add_soft_renderbuffers(struct gl_framebuffer *fb,
-                             GLboolean color,
-                             GLboolean depth,
-                             GLboolean stencil,
-                             GLboolean accum,
-                             GLboolean alpha,
-                             GLboolean aux)
-{
-   GLboolean frontLeft = GL_TRUE;
-   GLboolean backLeft = fb->Visual.doubleBufferMode;
-   GLboolean frontRight = fb->Visual.stereoMode;
-   GLboolean backRight = fb->Visual.stereoMode && fb->Visual.doubleBufferMode;
-
-   if (color) {
-      assert(fb->Visual.redBits == fb->Visual.greenBits);
-      assert(fb->Visual.redBits == fb->Visual.blueBits);
-      _mesa_add_color_renderbuffers(NULL, fb,
-				    fb->Visual.redBits,
-				    fb->Visual.alphaBits,
-				    frontLeft, backLeft,
-				    frontRight, backRight);
-   }
-
-   if (depth) {
-      assert(fb->Visual.depthBits > 0);
-      _mesa_add_depth_renderbuffer(NULL, fb, fb->Visual.depthBits);
-   }
-
-   if (stencil) {
-      assert(fb->Visual.stencilBits > 0);
-      _mesa_add_stencil_renderbuffer(NULL, fb, fb->Visual.stencilBits);
-   }
-
-   if (accum) {
-      assert(fb->Visual.accumRedBits > 0);
-      assert(fb->Visual.accumGreenBits > 0);
-      assert(fb->Visual.accumBlueBits > 0);
-      _mesa_add_accum_renderbuffer(NULL, fb,
-                                   fb->Visual.accumRedBits,
-                                   fb->Visual.accumGreenBits,
-                                   fb->Visual.accumBlueBits,
-                                   fb->Visual.accumAlphaBits);
-   }
-
-   if (aux) {
-      assert(fb->Visual.numAuxBuffers > 0);
-      _mesa_add_aux_renderbuffers(NULL, fb, fb->Visual.redBits,
-                                  fb->Visual.numAuxBuffers);
-   }
-
-   if (alpha) {
-      assert(fb->Visual.alphaBits > 0);
-      _mesa_add_alpha_renderbuffers(NULL, fb, fb->Visual.alphaBits,
-                                    frontLeft, backLeft,
-                                    frontRight, backRight);
-   }
-
-#if 0
-   if (multisample) {
-      /* maybe someday */
-   }
-#endif
-}
-
-
-/**
- * Attach a renderbuffer to a framebuffer.
- */
-void
-_mesa_add_renderbuffer(struct gl_framebuffer *fb,
-                       GLuint bufferName, struct gl_renderbuffer *rb)
-{
-   assert(fb);
-   assert(rb);
-   assert(bufferName < BUFFER_COUNT);
-
-   /* There should be no previous renderbuffer on this attachment point,
-    * with the exception of depth/stencil since the same renderbuffer may
-    * be used for both.
-    */
-   assert(bufferName == BUFFER_DEPTH ||
-          bufferName == BUFFER_STENCIL ||
-          fb->Attachment[bufferName].Renderbuffer == NULL);
-
-   /* winsys vs. user-created buffer cross check */
-   if (fb->Name) {
-      assert(rb->Name);
-   }
-   else {
-      assert(!rb->Name);
-   }
-
-   fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;
-   fb->Attachment[bufferName].Complete = GL_TRUE;
-   _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);
-}
-
-
-/**
- * Remove the named renderbuffer from the given framebuffer.
- */
-void
-_mesa_remove_renderbuffer(struct gl_framebuffer *fb, GLuint bufferName)
-{
-   struct gl_renderbuffer *rb;
-
-   assert(bufferName < BUFFER_COUNT);
-
-   rb = fb->Attachment[bufferName].Renderbuffer;
-   if (!rb)
-      return;
-
-   _mesa_reference_renderbuffer(&rb, NULL);
-
-   fb->Attachment[bufferName].Renderbuffer = NULL;
-}
-
-
-/**
- * Set *ptr to point to rb.  If *ptr points to another renderbuffer,
- * dereference that buffer first.  The new renderbuffer's refcount will
- * be incremented.  The old renderbuffer's refcount will be decremented.
- */
-void
-_mesa_reference_renderbuffer(struct gl_renderbuffer **ptr,
-                             struct gl_renderbuffer *rb)
-{
-   assert(ptr);
-   if (*ptr == rb) {
-      /* no change */
-      return;
-   }
-
-   if (*ptr) {
-      /* Unreference the old renderbuffer */
-      GLboolean deleteFlag = GL_FALSE;
-      struct gl_renderbuffer *oldRb = *ptr;
-
-      assert(oldRb->Magic == RB_MAGIC);
-      _glthread_LOCK_MUTEX(oldRb->Mutex);
-      assert(oldRb->Magic == RB_MAGIC);
-      ASSERT(oldRb->RefCount > 0);
-      oldRb->RefCount--;
-      /*printf("RB DECR %p (%d) to %d\n", (void*) oldRb, oldRb->Name, oldRb->RefCount);*/
-      deleteFlag = (oldRb->RefCount == 0);
-      _glthread_UNLOCK_MUTEX(oldRb->Mutex);
-
-      if (deleteFlag) {
-         oldRb->Magic = 0; /* now invalid memory! */
-         oldRb->Delete(oldRb);
-      }
-
-      *ptr = NULL;
-   }
-   assert(!*ptr);
-
-   if (rb) {
-      assert(rb->Magic == RB_MAGIC);
-      /* reference new renderbuffer */
-      _glthread_LOCK_MUTEX(rb->Mutex);
-      rb->RefCount++;
-      /*printf("RB INCR %p (%d) to %d\n", (void*) rb, rb->Name, rb->RefCount);*/
-      _glthread_UNLOCK_MUTEX(rb->Mutex);
-      *ptr = rb;
-   }
-}
-
-
-/**
- * Create a new combined depth/stencil renderbuffer for implementing
- * the GL_EXT_packed_depth_stencil extension.
- * \return new depth/stencil renderbuffer
- */
-struct gl_renderbuffer *
-_mesa_new_depthstencil_renderbuffer(GLcontext *ctx, GLuint name)
-{
-   struct gl_renderbuffer *dsrb;
-
-   dsrb = _mesa_new_renderbuffer(ctx, name);
-   if (!dsrb)
-      return NULL;
-
-   /* init fields not covered by _mesa_new_renderbuffer() */
-   dsrb->InternalFormat = GL_DEPTH24_STENCIL8_EXT;
-   dsrb->Format = MESA_FORMAT_Z24_S8;
-   dsrb->AllocStorage = _mesa_soft_renderbuffer_storage;
-
-   return dsrb;
-}
+/*

+ * Mesa 3-D graphics library

+ * Version:  6.5

+ *

+ * Copyright (C) 1999-2006  Brian Paul   All Rights Reserved.

+ *

+ * Permission is hereby granted, free of charge, to any person obtaining a

+ * copy of this software and associated documentation files (the "Software"),

+ * to deal in the Software without restriction, including without limitation

+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,

+ * and/or sell copies of the Software, and to permit persons to whom the

+ * Software is furnished to do so, subject to the following conditions:

+ *

+ * The above copyright notice and this permission notice shall be included

+ * in all copies or substantial portions of the Software.

+ *

+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

+ * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

+ * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN

+ * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

+ */

+

+

+/**

+ * Functions for allocating/managing renderbuffers.

+ * Also, routines for reading/writing software-based renderbuffer data as

+ * ubytes, ushorts, uints, etc.

+ *

+ * The 'alpha8' renderbuffer is interesting.  It's used to add a software-based

+ * alpha channel to RGB renderbuffers.  This is done by wrapping the RGB

+ * renderbuffer with the alpha renderbuffer.  We can do this because of the

+ * OO-nature of renderbuffers.

+ *

+ * Down the road we'll use this for run-time support of 8, 16 and 32-bit

+ * color channels.  For example, Mesa may use 32-bit/float color channels

+ * internally (swrast) and use wrapper renderbuffers to convert 32-bit

+ * values down to 16 or 8-bit values for whatever kind of framebuffer we have.

+ */

+

+

+#include "glheader.h"

+#include "imports.h"

+#include "context.h"

+#include "fbobject.h"

+#include "formats.h"

+#include "mtypes.h"

+#include "renderbuffer.h"

+

+

+/*

+ * Routines for get/put values in common buffer formats follow.

+ * Someday add support for arbitrary row stride to make them more

+ * flexible.

+ */

+

+/**********************************************************************

+ * Functions for buffers of 1 X GLubyte values.

+ * Typically stencil.

+ */

+

+static void *

+get_pointer_ubyte(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                  GLint x, GLint y)

+{

+   if (!rb->Data)

+      return NULL;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   /* Can't assert rb->Format since these funcs may be used for serveral

+    * different formats (GL_ALPHA8, GL_STENCIL_INDEX8, etc).

+    */

+   return (GLubyte *) rb->Data + y * rb->Width + x;

+}

+

+

+static void

+get_row_ubyte(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+              GLint x, GLint y, void *values)

+{

+   const GLubyte *src = (const GLubyte *) rb->Data + y * rb->Width + x;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   memcpy(values, src, count * sizeof(GLubyte));

+}

+

+

+static void

+get_values_ubyte(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                 const GLint x[], const GLint y[], void *values)

+{

+   GLubyte *dst = (GLubyte *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   for (i = 0; i < count; i++) {

+      const GLubyte *src = (GLubyte *) rb->Data + y[i] * rb->Width + x[i];

+      dst[i] = *src;

+   }

+}

+

+

+static void

+put_row_ubyte(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+              GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   const GLubyte *src = (const GLubyte *) values;

+   GLubyte *dst = (GLubyte *) rb->Data + y * rb->Width + x;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i] = src[i];

+         }

+      }

+   }

+   else {

+      memcpy(dst, values, count * sizeof(GLubyte));

+   }

+}

+

+

+static void

+put_mono_row_ubyte(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                   GLint x, GLint y, const void *value, const GLubyte *mask)

+{

+   const GLubyte val = *((const GLubyte *) value);

+   GLubyte *dst = (GLubyte *) rb->Data + y * rb->Width + x;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i] = val;

+         }

+      }

+   }

+   else {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         dst[i] = val;

+      }

+   }

+}

+

+

+static void

+put_values_ubyte(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                 const GLint x[], const GLint y[],

+                 const void *values, const GLubyte *mask)

+{

+   const GLubyte *src = (const GLubyte *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLubyte *dst = (GLubyte *) rb->Data + y[i] * rb->Width + x[i];

+         *dst = src[i];

+      }

+   }

+}

+

+

+static void

+put_mono_values_ubyte(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                      const GLint x[], const GLint y[],

+                      const void *value, const GLubyte *mask)

+{

+   const GLubyte val = *((const GLubyte *) value);

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLubyte *dst = (GLubyte *) rb->Data + y[i] * rb->Width + x[i];

+         *dst = val;

+      }

+   }

+}

+

+

+/**********************************************************************

+ * Functions for buffers of 1 X GLushort values.

+ * Typically depth/Z.

+ */

+

+static void *

+get_pointer_ushort(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                   GLint x, GLint y)

+{

+   if (!rb->Data)

+      return NULL;

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);

+   ASSERT(rb->Width > 0);

+   return (GLushort *) rb->Data + y * rb->Width + x;

+}

+

+

+static void

+get_row_ushort(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+               GLint x, GLint y, void *values)

+{

+   const void *src = rb->GetPointer(ctx, rb, x, y);

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);

+   memcpy(values, src, count * sizeof(GLushort));

+}

+

+

+static void

+get_values_ushort(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                  const GLint x[], const GLint y[], void *values)

+{

+   GLushort *dst = (GLushort *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);

+   for (i = 0; i < count; i++) {

+      const GLushort *src = (GLushort *) rb->Data + y[i] * rb->Width + x[i];

+      dst[i] = *src;

+   }

+}

+

+

+static void

+put_row_ushort(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+               GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   const GLushort *src = (const GLushort *) values;

+   GLushort *dst = (GLushort *) rb->Data + y * rb->Width + x;

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i] = src[i];

+         }

+      }

+   }

+   else {

+      memcpy(dst, src, count * sizeof(GLushort));

+   }

+}

+

+

+static void

+put_mono_row_ushort(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                    GLint x, GLint y, const void *value, const GLubyte *mask)

+{

+   const GLushort val = *((const GLushort *) value);

+   GLushort *dst = (GLushort *) rb->Data + y * rb->Width + x;

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i] = val;

+         }

+      }

+   }

+   else {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         dst[i] = val;

+      }

+   }

+}

+

+

+static void

+put_values_ushort(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                  const GLint x[], const GLint y[], const void *values,

+                  const GLubyte *mask)

+{

+   const GLushort *src = (const GLushort *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLushort *dst = (GLushort *) rb->Data + y[i] * rb->Width + x[i];

+         *dst = src[i];

+      }

+   }

+}

+ 

+

+static void

+put_mono_values_ushort(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                       GLuint count, const GLint x[], const GLint y[],

+                       const void *value, const GLubyte *mask)

+{

+   const GLushort val = *((const GLushort *) value);

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            GLushort *dst = (GLushort *) rb->Data + y[i] * rb->Width + x[i];

+            *dst = val;

+         }

+      }

+   }

+   else {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         GLushort *dst = (GLushort *) rb->Data + y[i] * rb->Width + x[i];

+         *dst = val;

+      }

+   }

+}

+ 

+

+/**********************************************************************

+ * Functions for buffers of 1 X GLuint values.

+ * Typically depth/Z or color index.

+ */

+

+static void *

+get_pointer_uint(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                 GLint x, GLint y)

+{

+   if (!rb->Data)

+      return NULL;

+   ASSERT(rb->DataType == GL_UNSIGNED_INT ||

+          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);

+   return (GLuint *) rb->Data + y * rb->Width + x;

+}

+

+

+static void

+get_row_uint(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+             GLint x, GLint y, void *values)

+{

+   const void *src = rb->GetPointer(ctx, rb, x, y);

+   ASSERT(rb->DataType == GL_UNSIGNED_INT ||

+          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);

+   memcpy(values, src, count * sizeof(GLuint));

+}

+

+

+static void

+get_values_uint(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                const GLint x[], const GLint y[], void *values)

+{

+   GLuint *dst = (GLuint *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_INT ||

+          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);

+   for (i = 0; i < count; i++) {

+      const GLuint *src = (GLuint *) rb->Data + y[i] * rb->Width + x[i];

+      dst[i] = *src;

+   }

+}

+

+

+static void

+put_row_uint(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+             GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   const GLuint *src = (const GLuint *) values;

+   GLuint *dst = (GLuint *) rb->Data + y * rb->Width + x;

+   ASSERT(rb->DataType == GL_UNSIGNED_INT ||

+          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i] = src[i];

+         }

+      }

+   }

+   else {

+      memcpy(dst, src, count * sizeof(GLuint));

+   }

+}

+

+

+static void

+put_mono_row_uint(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                  GLint x, GLint y, const void *value, const GLubyte *mask)

+{

+   const GLuint val = *((const GLuint *) value);

+   GLuint *dst = (GLuint *) rb->Data + y * rb->Width + x;

+   ASSERT(rb->DataType == GL_UNSIGNED_INT ||

+          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i] = val;

+         }

+      }

+   }

+   else {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         dst[i] = val;

+      }

+   }

+}

+

+

+static void

+put_values_uint(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                const GLint x[], const GLint y[], const void *values,

+                const GLubyte *mask)

+{

+   const GLuint *src = (const GLuint *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_INT ||

+          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLuint *dst = (GLuint *) rb->Data + y[i] * rb->Width + x[i];

+         *dst = src[i];

+      }

+   }

+}

+

+

+static void

+put_mono_values_uint(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                     const GLint x[], const GLint y[], const void *value,

+                     const GLubyte *mask)

+{

+   const GLuint val = *((const GLuint *) value);

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_INT ||

+          rb->DataType == GL_UNSIGNED_INT_24_8_EXT);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLuint *dst = (GLuint *) rb->Data + y[i] * rb->Width + x[i];

+         *dst = val;

+      }

+   }

+}

+

+

+/**********************************************************************

+ * Functions for buffers of 3 X GLubyte (or GLbyte) values.

+ * Typically color buffers.

+ * NOTE: the incoming and outgoing colors are RGBA!  We ignore incoming

+ * alpha values and return 255 for outgoing alpha values.

+ */

+

+static void *

+get_pointer_ubyte3(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                   GLint x, GLint y)

+{

+   ASSERT(rb->Format == MESA_FORMAT_RGB888);

+   /* No direct access since this buffer is RGB but caller will be

+    * treating it as if it were RGBA.

+    */

+   return NULL;

+}

+

+

+static void

+get_row_ubyte3(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+               GLint x, GLint y, void *values)

+{

+   const GLubyte *src = (const GLubyte *) rb->Data + 3 * (y * rb->Width + x);

+   GLubyte *dst = (GLubyte *) values;

+   GLuint i;

+   ASSERT(rb->Format == MESA_FORMAT_RGB888);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   for (i = 0; i < count; i++) {

+      dst[i * 4 + 0] = src[i * 3 + 0];

+      dst[i * 4 + 1] = src[i * 3 + 1];

+      dst[i * 4 + 2] = src[i * 3 + 2];

+      dst[i * 4 + 3] = 255;

+   }

+}

+

+

+static void

+get_values_ubyte3(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                  const GLint x[], const GLint y[], void *values)

+{

+   GLubyte *dst = (GLubyte *) values;

+   GLuint i;

+   ASSERT(rb->Format == MESA_FORMAT_RGB888);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   for (i = 0; i < count; i++) {

+      const GLubyte *src

+         = (GLubyte *) rb->Data + 3 * (y[i] * rb->Width + x[i]);

+      dst[i * 4 + 0] = src[0];

+      dst[i * 4 + 1] = src[1];

+      dst[i * 4 + 2] = src[2];

+      dst[i * 4 + 3] = 255;

+   }

+}

+

+

+static void

+put_row_ubyte3(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+               GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   /* note: incoming values are RGB+A! */

+   const GLubyte *src = (const GLubyte *) values;

+   GLubyte *dst = (GLubyte *) rb->Data + 3 * (y * rb->Width + x);

+   GLuint i;

+   ASSERT(rb->Format == MESA_FORMAT_RGB888);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         dst[i * 3 + 0] = src[i * 4 + 0];

+         dst[i * 3 + 1] = src[i * 4 + 1];

+         dst[i * 3 + 2] = src[i * 4 + 2];

+      }

+   }

+}

+

+

+static void

+put_row_rgb_ubyte3(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                   GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   /* note: incoming values are RGB+A! */

+   const GLubyte *src = (const GLubyte *) values;

+   GLubyte *dst = (GLubyte *) rb->Data + 3 * (y * rb->Width + x);

+   GLuint i;

+   ASSERT(rb->Format == MESA_FORMAT_RGB888);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         dst[i * 3 + 0] = src[i * 3 + 0];

+         dst[i * 3 + 1] = src[i * 3 + 1];

+         dst[i * 3 + 2] = src[i * 3 + 2];

+      }

+   }

+}

+

+

+static void

+put_mono_row_ubyte3(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                    GLint x, GLint y, const void *value, const GLubyte *mask)

+{

+   /* note: incoming value is RGB+A! */

+   const GLubyte val0 = ((const GLubyte *) value)[0];

+   const GLubyte val1 = ((const GLubyte *) value)[1];

+   const GLubyte val2 = ((const GLubyte *) value)[2];

+   GLubyte *dst = (GLubyte *) rb->Data + 3 * (y * rb->Width + x);

+   ASSERT(rb->Format == MESA_FORMAT_RGB888);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   if (!mask && val0 == val1 && val1 == val2) {

+      /* optimized case */

+      memset(dst, val0, 3 * count);

+   }

+   else {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (!mask || mask[i]) {

+            dst[i * 3 + 0] = val0;

+            dst[i * 3 + 1] = val1;

+            dst[i * 3 + 2] = val2;

+         }

+      }

+   }

+}

+

+

+static void

+put_values_ubyte3(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                  const GLint x[], const GLint y[], const void *values,

+                  const GLubyte *mask)

+{

+   /* note: incoming values are RGB+A! */

+   const GLubyte *src = (const GLubyte *) values;

+   GLuint i;

+   ASSERT(rb->Format == MESA_FORMAT_RGB888);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLubyte *dst = (GLubyte *) rb->Data + 3 * (y[i] * rb->Width + x[i]);

+         dst[0] = src[i * 4 + 0];

+         dst[1] = src[i * 4 + 1];

+         dst[2] = src[i * 4 + 2];

+      }

+   }

+}

+

+

+static void

+put_mono_values_ubyte3(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                       GLuint count, const GLint x[], const GLint y[],

+                       const void *value, const GLubyte *mask)

+{

+   /* note: incoming value is RGB+A! */

+   const GLubyte val0 = ((const GLubyte *) value)[0];

+   const GLubyte val1 = ((const GLubyte *) value)[1];

+   const GLubyte val2 = ((const GLubyte *) value)[2];

+   GLuint i;

+   ASSERT(rb->Format == MESA_FORMAT_RGB888);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLubyte *dst = (GLubyte *) rb->Data + 3 * (y[i] * rb->Width + x[i]);

+         dst[0] = val0;

+         dst[1] = val1;

+         dst[2] = val2;

+      }

+   }

+}

+

+

+/**********************************************************************

+ * Functions for buffers of 4 X GLubyte (or GLbyte) values.

+ * Typically color buffers.

+ */

+

+static void *

+get_pointer_ubyte4(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                   GLint x, GLint y)

+{

+   if (!rb->Data)

+      return NULL;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);

+   return (GLubyte *) rb->Data + 4 * (y * rb->Width + x);

+}

+

+

+static void

+get_row_ubyte4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+               GLint x, GLint y, void *values)

+{

+   const GLubyte *src = (const GLubyte *) rb->Data + 4 * (y * rb->Width + x);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);

+   memcpy(values, src, 4 * count * sizeof(GLubyte));

+}

+

+

+static void

+get_values_ubyte4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                  const GLint x[], const GLint y[], void *values)

+{

+   /* treat 4*GLubyte as 1*GLuint */

+   GLuint *dst = (GLuint *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);

+   for (i = 0; i < count; i++) {

+      const GLuint *src = (GLuint *) rb->Data + (y[i] * rb->Width + x[i]);

+      dst[i] = *src;

+   }

+}

+

+

+static void

+put_row_ubyte4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+               GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   /* treat 4*GLubyte as 1*GLuint */

+   const GLuint *src = (const GLuint *) values;

+   GLuint *dst = (GLuint *) rb->Data + (y * rb->Width + x);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i] = src[i];

+         }

+      }

+   }

+   else {

+      memcpy(dst, src, 4 * count * sizeof(GLubyte));

+   }

+}

+

+

+static void

+put_row_rgb_ubyte4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                   GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   /* Store RGB values in RGBA buffer */

+   const GLubyte *src = (const GLubyte *) values;

+   GLubyte *dst = (GLubyte *) rb->Data + 4 * (y * rb->Width + x);

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         dst[i * 4 + 0] = src[i * 3 + 0];

+         dst[i * 4 + 1] = src[i * 3 + 1];

+         dst[i * 4 + 2] = src[i * 3 + 2];

+         dst[i * 4 + 3] = 0xff;

+      }

+   }

+}

+

+

+static void

+put_mono_row_ubyte4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                    GLint x, GLint y, const void *value, const GLubyte *mask)

+{

+   /* treat 4*GLubyte as 1*GLuint */

+   const GLuint val = *((const GLuint *) value);

+   GLuint *dst = (GLuint *) rb->Data + (y * rb->Width + x);

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);

+   if (!mask && val == 0) {

+      /* common case */

+      memset(dst, 0, count * 4 * sizeof(GLubyte));

+   }

+   else {

+      /* general case */

+      if (mask) {

+         GLuint i;

+         for (i = 0; i < count; i++) {

+            if (mask[i]) {

+               dst[i] = val;

+            }

+         }

+      }

+      else {

+         GLuint i;

+         for (i = 0; i < count; i++) {

+            dst[i] = val;

+         }

+      }

+   }

+}

+

+

+static void

+put_values_ubyte4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                  const GLint x[], const GLint y[], const void *values,

+                  const GLubyte *mask)

+{

+   /* treat 4*GLubyte as 1*GLuint */

+   const GLuint *src = (const GLuint *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLuint *dst = (GLuint *) rb->Data + (y[i] * rb->Width + x[i]);

+         *dst = src[i];

+      }

+   }

+}

+

+

+static void

+put_mono_values_ubyte4(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                       GLuint count, const GLint x[], const GLint y[],

+                       const void *value, const GLubyte *mask)

+{

+   /* treat 4*GLubyte as 1*GLuint */

+   const GLuint val = *((const GLuint *) value);

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_BYTE);

+   ASSERT(rb->Format == MESA_FORMAT_RGBA8888);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLuint *dst = (GLuint *) rb->Data + (y[i] * rb->Width + x[i]);

+         *dst = val;

+      }

+   }

+}

+

+

+/**********************************************************************

+ * Functions for buffers of 4 X GLushort (or GLshort) values.

+ * Typically accum buffer.

+ */

+

+static void *

+get_pointer_ushort4(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                    GLint x, GLint y)

+{

+   if (!rb->Data)

+      return NULL;

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);

+   return (GLushort *) rb->Data + 4 * (y * rb->Width + x);

+}

+

+

+static void

+get_row_ushort4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                GLint x, GLint y, void *values)

+{

+   const GLshort *src = (const GLshort *) rb->Data + 4 * (y * rb->Width + x);

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);

+   memcpy(values, src, 4 * count * sizeof(GLshort));

+}

+

+

+static void

+get_values_ushort4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                   const GLint x[], const GLint y[], void *values)

+{

+   GLushort *dst = (GLushort *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);

+   for (i = 0; i < count; i++) {

+      const GLushort *src

+         = (GLushort *) rb->Data + 4 * (y[i] * rb->Width + x[i]);

+      dst[i] = *src;

+   }

+}

+

+

+static void

+put_row_ushort4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   const GLushort *src = (const GLushort *) values;

+   GLushort *dst = (GLushort *) rb->Data + 4 * (y * rb->Width + x);

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i * 4 + 0] = src[i * 4 + 0];

+            dst[i * 4 + 1] = src[i * 4 + 1];

+            dst[i * 4 + 2] = src[i * 4 + 2];

+            dst[i * 4 + 3] = src[i * 4 + 3];

+         }

+      }

+   }

+   else {

+      memcpy(dst, src, 4 * count * sizeof(GLushort));

+   }

+}

+

+

+static void

+put_row_rgb_ushort4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                    GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   /* Put RGB values in RGBA buffer */

+   const GLushort *src = (const GLushort *) values;

+   GLushort *dst = (GLushort *) rb->Data + 4 * (y * rb->Width + x);

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i * 4 + 0] = src[i * 3 + 0];

+            dst[i * 4 + 1] = src[i * 3 + 1];

+            dst[i * 4 + 2] = src[i * 3 + 2];

+            dst[i * 4 + 3] = 0xffff;

+         }

+      }

+   }

+   else {

+      memcpy(dst, src, 4 * count * sizeof(GLushort));

+   }

+}

+

+

+static void

+put_mono_row_ushort4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                     GLint x, GLint y, const void *value, const GLubyte *mask)

+{

+   const GLushort val0 = ((const GLushort *) value)[0];

+   const GLushort val1 = ((const GLushort *) value)[1];

+   const GLushort val2 = ((const GLushort *) value)[2];

+   const GLushort val3 = ((const GLushort *) value)[3];

+   GLushort *dst = (GLushort *) rb->Data + 4 * (y * rb->Width + x);

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);

+   if (!mask && val0 == 0 && val1 == 0 && val2 == 0 && val3 == 0) {

+      /* common case for clearing accum buffer */

+      memset(dst, 0, count * 4 * sizeof(GLushort));

+   }

+   else {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (!mask || mask[i]) {

+            dst[i * 4 + 0] = val0;

+            dst[i * 4 + 1] = val1;

+            dst[i * 4 + 2] = val2;

+            dst[i * 4 + 3] = val3;

+         }

+      }

+   }

+}

+

+

+static void

+put_values_ushort4(struct gl_context *ctx, struct gl_renderbuffer *rb, GLuint count,

+                   const GLint x[], const GLint y[], const void *values,

+                   const GLubyte *mask)

+{

+   const GLushort *src = (const GLushort *) values;

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLushort *dst = (GLushort *) rb->Data + 4 * (y[i] * rb->Width + x[i]);

+         dst[0] = src[i * 4 + 0];

+         dst[1] = src[i * 4 + 1];

+         dst[2] = src[i * 4 + 2];

+         dst[3] = src[i * 4 + 3];

+      }

+   }

+}

+

+

+static void

+put_mono_values_ushort4(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                        GLuint count, const GLint x[], const GLint y[],

+                        const void *value, const GLubyte *mask)

+{

+   const GLushort val0 = ((const GLushort *) value)[0];

+   const GLushort val1 = ((const GLushort *) value)[1];

+   const GLushort val2 = ((const GLushort *) value)[2];

+   const GLushort val3 = ((const GLushort *) value)[3];

+   GLuint i;

+   ASSERT(rb->DataType == GL_UNSIGNED_SHORT || rb->DataType == GL_SHORT);

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLushort *dst = (GLushort *) rb->Data + 4 * (y[i] * rb->Width + x[i]);

+         dst[0] = val0;

+         dst[1] = val1;

+         dst[2] = val2;

+         dst[3] = val3;

+      }

+   }

+}

+

+

+

+/**

+ * This is a software fallback for the gl_renderbuffer->AllocStorage

+ * function.

+ * Device drivers will typically override this function for the buffers

+ * which it manages (typically color buffers, Z and stencil).

+ * Other buffers (like software accumulation and aux buffers) which the driver

+ * doesn't manage can be handled with this function.

+ *

+ * This one multi-purpose function can allocate stencil, depth, accum, color

+ * or color-index buffers!

+ *

+ * This function also plugs in the appropriate GetPointer, Get/PutRow and

+ * Get/PutValues functions.

+ */

+GLboolean

+_mesa_soft_renderbuffer_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,

+                                GLenum internalFormat,

+                                GLuint width, GLuint height)

+{

+   GLuint pixelSize;

+

+   switch (internalFormat) {

+   case GL_RGB:

+   case GL_R3_G3_B2:

+   case GL_RGB4:

+   case GL_RGB5:

+   case GL_RGB8:

+   case GL_RGB10:

+   case GL_RGB12:

+   case GL_RGB16:

+      rb->Format = MESA_FORMAT_RGB888;

+      rb->DataType = GL_UNSIGNED_BYTE;

+      rb->GetPointer = get_pointer_ubyte3;

+      rb->GetRow = get_row_ubyte3;

+      rb->GetValues = get_values_ubyte3;

+      rb->PutRow = put_row_ubyte3;

+      rb->PutRowRGB = put_row_rgb_ubyte3;

+      rb->PutMonoRow = put_mono_row_ubyte3;

+      rb->PutValues = put_values_ubyte3;

+      rb->PutMonoValues = put_mono_values_ubyte3;

+      pixelSize = 3 * sizeof(GLubyte);

+      break;

+   case GL_RGBA:

+   case GL_RGBA2:

+   case GL_RGBA4:

+   case GL_RGB5_A1:

+   case GL_RGBA8:

+#if 1

+   case GL_RGB10_A2:

+   case GL_RGBA12:

+#endif

+      rb->Format = MESA_FORMAT_RGBA8888;

+      rb->DataType = GL_UNSIGNED_BYTE;

+      rb->GetPointer = get_pointer_ubyte4;

+      rb->GetRow = get_row_ubyte4;

+      rb->GetValues = get_values_ubyte4;

+      rb->PutRow = put_row_ubyte4;

+      rb->PutRowRGB = put_row_rgb_ubyte4;

+      rb->PutMonoRow = put_mono_row_ubyte4;

+      rb->PutValues = put_values_ubyte4;

+      rb->PutMonoValues = put_mono_values_ubyte4;

+      pixelSize = 4 * sizeof(GLubyte);

+      break;

+   case GL_RGBA16:

+   case GL_RGBA16_SNORM:

+      /* for accum buffer */

+      rb->Format = MESA_FORMAT_SIGNED_RGBA_16;

+      rb->DataType = GL_SHORT;

+      rb->GetPointer = get_pointer_ushort4;

+      rb->GetRow = get_row_ushort4;

+      rb->GetValues = get_values_ushort4;

+      rb->PutRow = put_row_ushort4;

+      rb->PutRowRGB = put_row_rgb_ushort4;

+      rb->PutMonoRow = put_mono_row_ushort4;

+      rb->PutValues = put_values_ushort4;

+      rb->PutMonoValues = put_mono_values_ushort4;

+      pixelSize = 4 * sizeof(GLushort);

+      break;

+#if 0

+   case GL_ALPHA8:

+      rb->Format = MESA_FORMAT_A8;

+      rb->DataType = GL_UNSIGNED_BYTE;

+      rb->GetPointer = get_pointer_alpha8;

+      rb->GetRow = get_row_alpha8;

+      rb->GetValues = get_values_alpha8;

+      rb->PutRow = put_row_alpha8;

+      rb->PutRowRGB = NULL;

+      rb->PutMonoRow = put_mono_row_alpha8;

+      rb->PutValues = put_values_alpha8;

+      rb->PutMonoValues = put_mono_values_alpha8;

+      pixelSize = sizeof(GLubyte);

+      break;

+#endif

+   case GL_STENCIL_INDEX:

+   case GL_STENCIL_INDEX1_EXT:

+   case GL_STENCIL_INDEX4_EXT:

+   case GL_STENCIL_INDEX8_EXT:

+   case GL_STENCIL_INDEX16_EXT:

+      rb->Format = MESA_FORMAT_S8;

+      rb->DataType = GL_UNSIGNED_BYTE;

+      rb->GetPointer = get_pointer_ubyte;

+      rb->GetRow = get_row_ubyte;

+      rb->GetValues = get_values_ubyte;

+      rb->PutRow = put_row_ubyte;

+      rb->PutRowRGB = NULL;

+      rb->PutMonoRow = put_mono_row_ubyte;

+      rb->PutValues = put_values_ubyte;

+      rb->PutMonoValues = put_mono_values_ubyte;

+      pixelSize = sizeof(GLubyte);

+      break;

+   case GL_DEPTH_COMPONENT:

+   case GL_DEPTH_COMPONENT16:

+      rb->Format = MESA_FORMAT_Z16;

+      rb->DataType = GL_UNSIGNED_SHORT;

+      rb->GetPointer = get_pointer_ushort;

+      rb->GetRow = get_row_ushort;

+      rb->GetValues = get_values_ushort;

+      rb->PutRow = put_row_ushort;

+      rb->PutRowRGB = NULL;

+      rb->PutMonoRow = put_mono_row_ushort;

+      rb->PutValues = put_values_ushort;

+      rb->PutMonoValues = put_mono_values_ushort;

+      pixelSize = sizeof(GLushort);

+      break;

+   case GL_DEPTH_COMPONENT24:

+      rb->DataType = GL_UNSIGNED_INT;

+      rb->GetPointer = get_pointer_uint;

+      rb->GetRow = get_row_uint;

+      rb->GetValues = get_values_uint;

+      rb->PutRow = put_row_uint;

+      rb->PutRowRGB = NULL;

+      rb->PutMonoRow = put_mono_row_uint;

+      rb->PutValues = put_values_uint;

+      rb->PutMonoValues = put_mono_values_uint;

+      rb->Format = MESA_FORMAT_X8_Z24;

+      pixelSize = sizeof(GLuint);

+      break;

+   case GL_DEPTH_COMPONENT32:

+      rb->DataType = GL_UNSIGNED_INT;

+      rb->GetPointer = get_pointer_uint;

+      rb->GetRow = get_row_uint;

+      rb->GetValues = get_values_uint;

+      rb->PutRow = put_row_uint;

+      rb->PutRowRGB = NULL;

+      rb->PutMonoRow = put_mono_row_uint;

+      rb->PutValues = put_values_uint;

+      rb->PutMonoValues = put_mono_values_uint;

+      rb->Format = MESA_FORMAT_Z32;

+      pixelSize = sizeof(GLuint);

+      break;

+   case GL_DEPTH_STENCIL_EXT:

+   case GL_DEPTH24_STENCIL8_EXT:

+      rb->Format = MESA_FORMAT_Z24_S8;

+      rb->DataType = GL_UNSIGNED_INT_24_8_EXT;

+      rb->GetPointer = get_pointer_uint;

+      rb->GetRow = get_row_uint;

+      rb->GetValues = get_values_uint;

+      rb->PutRow = put_row_uint;

+      rb->PutRowRGB = NULL;

+      rb->PutMonoRow = put_mono_row_uint;

+      rb->PutValues = put_values_uint;

+      rb->PutMonoValues = put_mono_values_uint;

+      pixelSize = sizeof(GLuint);

+      break;

+   default:

+      _mesa_problem(ctx, "Bad internalFormat in _mesa_soft_renderbuffer_storage");

+      return GL_FALSE;

+   }

+

+   ASSERT(rb->DataType);

+   ASSERT(rb->GetPointer);

+   ASSERT(rb->GetRow);

+   ASSERT(rb->GetValues);

+   ASSERT(rb->PutRow);

+   ASSERT(rb->PutMonoRow);

+   ASSERT(rb->PutValues);

+   ASSERT(rb->PutMonoValues);

+

+   /* free old buffer storage */

+   if (rb->Data) {

+      free(rb->Data);

+      rb->Data = NULL;

+   }

+

+   if (width > 0 && height > 0) {

+      /* allocate new buffer storage */

+      rb->Data = malloc(width * height * pixelSize);

+

+      if (rb->Data == NULL) {

+         rb->Width = 0;

+         rb->Height = 0;

+         _mesa_error(ctx, GL_OUT_OF_MEMORY,

+                     "software renderbuffer allocation (%d x %d x %d)",

+                     width, height, pixelSize);

+         return GL_FALSE;

+      }

+   }

+

+   rb->Width = width;

+   rb->Height = height;

+   rb->_BaseFormat = _mesa_base_fbo_format(ctx, internalFormat);

+   ASSERT(rb->_BaseFormat);

+

+   return GL_TRUE;

+}

+

+

+

+/**********************************************************************/

+/**********************************************************************/

+/**********************************************************************/

+

+

+/**

+ * Here we utilize the gl_renderbuffer->Wrapper field to put an alpha

+ * buffer wrapper around an existing RGB renderbuffer (hw or sw).

+ *

+ * When PutRow is called (for example), we store the alpha values in

+ * this buffer, then pass on the PutRow call to the wrapped RGB

+ * buffer.

+ */

+

+

+static GLboolean

+alloc_storage_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb,

+                     GLenum internalFormat, GLuint width, GLuint height)

+{

+   ASSERT(arb != arb->Wrapped);

+   ASSERT(arb->Format == MESA_FORMAT_A8);

+

+   /* first, pass the call to the wrapped RGB buffer */

+   if (!arb->Wrapped->AllocStorage(ctx, arb->Wrapped, internalFormat,

+                                  width, height)) {

+      return GL_FALSE;

+   }

+

+   /* next, resize my alpha buffer */

+   if (arb->Data) {

+      free(arb->Data);

+   }

+

+   arb->Data = malloc(width * height * sizeof(GLubyte));

+   if (arb->Data == NULL) {

+      arb->Width = 0;

+      arb->Height = 0;

+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "software alpha buffer allocation");

+      return GL_FALSE;

+   }

+

+   arb->Width = width;

+   arb->Height = height;

+

+   return GL_TRUE;

+}

+

+

+/**

+ * Delete an alpha_renderbuffer object, as well as the wrapped RGB buffer.

+ */

+static void

+delete_renderbuffer_alpha8(struct gl_renderbuffer *arb)

+{

+   if (arb->Data) {

+      free(arb->Data);

+   }

+   ASSERT(arb->Wrapped);

+   ASSERT(arb != arb->Wrapped);

+   arb->Wrapped->Delete(arb->Wrapped);

+   arb->Wrapped = NULL;

+   free(arb);

+}

+

+

+static void *

+get_pointer_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb,

+                   GLint x, GLint y)

+{

+   return NULL;   /* don't allow direct access! */

+}

+

+

+static void

+get_row_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,

+               GLint x, GLint y, void *values)

+{

+   /* NOTE: 'values' is RGBA format! */

+   const GLubyte *src = (const GLubyte *) arb->Data + y * arb->Width + x;

+   GLubyte *dst = (GLubyte *) values;

+   GLuint i;

+   ASSERT(arb != arb->Wrapped);

+   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);

+   /* first, pass the call to the wrapped RGB buffer */

+   arb->Wrapped->GetRow(ctx, arb->Wrapped, count, x, y, values);

+   /* second, fill in alpha values from this buffer! */

+   for (i = 0; i < count; i++) {

+      dst[i * 4 + 3] = src[i];

+   }

+}

+

+

+static void

+get_values_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,

+                  const GLint x[], const GLint y[], void *values)

+{

+   GLubyte *dst = (GLubyte *) values;

+   GLuint i;

+   ASSERT(arb != arb->Wrapped);

+   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);

+   /* first, pass the call to the wrapped RGB buffer */

+   arb->Wrapped->GetValues(ctx, arb->Wrapped, count, x, y, values);

+   /* second, fill in alpha values from this buffer! */

+   for (i = 0; i < count; i++) {

+      const GLubyte *src = (GLubyte *) arb->Data + y[i] * arb->Width + x[i];

+      dst[i * 4 + 3] = *src;

+   }

+}

+

+

+static void

+put_row_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,

+               GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   const GLubyte *src = (const GLubyte *) values;

+   GLubyte *dst = (GLubyte *) arb->Data + y * arb->Width + x;

+   GLuint i;

+   ASSERT(arb != arb->Wrapped);

+   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);

+   /* first, pass the call to the wrapped RGB buffer */

+   arb->Wrapped->PutRow(ctx, arb->Wrapped, count, x, y, values, mask);

+   /* second, store alpha in our buffer */

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         dst[i] = src[i * 4 + 3];

+      }

+   }

+}

+

+

+static void

+put_row_rgb_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,

+                   GLint x, GLint y, const void *values, const GLubyte *mask)

+{

+   const GLubyte *src = (const GLubyte *) values;

+   GLubyte *dst = (GLubyte *) arb->Data + y * arb->Width + x;

+   GLuint i;

+   ASSERT(arb != arb->Wrapped);

+   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);

+   /* first, pass the call to the wrapped RGB buffer */

+   arb->Wrapped->PutRowRGB(ctx, arb->Wrapped, count, x, y, values, mask);

+   /* second, store alpha in our buffer */

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         dst[i] = src[i * 4 + 3];

+      }

+   }

+}

+

+

+static void

+put_mono_row_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,

+                    GLint x, GLint y, const void *value, const GLubyte *mask)

+{

+   const GLubyte val = ((const GLubyte *) value)[3];

+   GLubyte *dst = (GLubyte *) arb->Data + y * arb->Width + x;

+   ASSERT(arb != arb->Wrapped);

+   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);

+   /* first, pass the call to the wrapped RGB buffer */

+   arb->Wrapped->PutMonoRow(ctx, arb->Wrapped, count, x, y, value, mask);

+   /* second, store alpha in our buffer */

+   if (mask) {

+      GLuint i;

+      for (i = 0; i < count; i++) {

+         if (mask[i]) {

+            dst[i] = val;

+         }

+      }

+   }

+   else {

+      memset(dst, val, count);

+   }

+}

+

+

+static void

+put_values_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb, GLuint count,

+                  const GLint x[], const GLint y[],

+                  const void *values, const GLubyte *mask)

+{

+   const GLubyte *src = (const GLubyte *) values;

+   GLuint i;

+   ASSERT(arb != arb->Wrapped);

+   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);

+   /* first, pass the call to the wrapped RGB buffer */

+   arb->Wrapped->PutValues(ctx, arb->Wrapped, count, x, y, values, mask);

+   /* second, store alpha in our buffer */

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLubyte *dst = (GLubyte *) arb->Data + y[i] * arb->Width + x[i];

+         *dst = src[i * 4 + 3];

+      }

+   }

+}

+

+

+static void

+put_mono_values_alpha8(struct gl_context *ctx, struct gl_renderbuffer *arb,

+                       GLuint count, const GLint x[], const GLint y[],

+                       const void *value, const GLubyte *mask)

+{

+   const GLubyte val = ((const GLubyte *) value)[3];

+   GLuint i;

+   ASSERT(arb != arb->Wrapped);

+   ASSERT(arb->DataType == GL_UNSIGNED_BYTE);

+   /* first, pass the call to the wrapped RGB buffer */

+   arb->Wrapped->PutValues(ctx, arb->Wrapped, count, x, y, value, mask);

+   /* second, store alpha in our buffer */

+   for (i = 0; i < count; i++) {

+      if (!mask || mask[i]) {

+         GLubyte *dst = (GLubyte *) arb->Data + y[i] * arb->Width + x[i];

+         *dst = val;

+      }

+   }

+}

+

+

+static void

+copy_buffer_alpha8(struct gl_renderbuffer* dst, struct gl_renderbuffer* src)

+{

+   ASSERT(dst->Format == MESA_FORMAT_A8);

+   ASSERT(src->Format == MESA_FORMAT_A8);

+   ASSERT(dst->Width == src->Width);

+   ASSERT(dst->Height == src->Height);

+

+   memcpy(dst->Data, src->Data, dst->Width * dst->Height * sizeof(GLubyte));

+}

+

+

+/**********************************************************************/

+/**********************************************************************/

+/**********************************************************************/

+

+

+/**

+ * Default GetPointer routine.  Always return NULL to indicate that

+ * direct buffer access is not supported.

+ */

+static void *

+nop_get_pointer(struct gl_context *ctx, struct gl_renderbuffer *rb, GLint x, GLint y)

+{

+   return NULL;

+}

+

+

+/**

+ * Initialize the fields of a gl_renderbuffer to default values.

+ */

+void

+_mesa_init_renderbuffer(struct gl_renderbuffer *rb, GLuint name)

+{

+   _glthread_INIT_MUTEX(rb->Mutex);

+

+   rb->Magic = RB_MAGIC;

+   rb->ClassID = 0;

+   rb->Name = name;

+   rb->RefCount = 0;

+   rb->Delete = _mesa_delete_renderbuffer;

+

+   /* The rest of these should be set later by the caller of this function or

+    * the AllocStorage method:

+    */

+   rb->AllocStorage = NULL;

+

+   rb->Width = 0;

+   rb->Height = 0;

+   rb->InternalFormat = GL_NONE;

+   rb->Format = MESA_FORMAT_NONE;

+

+   rb->DataType = GL_NONE;

+   rb->Data = NULL;

+

+   /* Point back to ourself so that we don't have to check for Wrapped==NULL

+    * all over the drivers.

+    */

+   rb->Wrapped = rb;

+

+   rb->GetPointer = nop_get_pointer;

+   rb->GetRow = NULL;

+   rb->GetValues = NULL;

+   rb->PutRow = NULL;

+   rb->PutRowRGB = NULL;

+   rb->PutMonoRow = NULL;

+   rb->PutValues = NULL;

+   rb->PutMonoValues = NULL;

+}

+

+

+/**

+ * Allocate a new gl_renderbuffer object.  This can be used for user-created

+ * renderbuffers or window-system renderbuffers.

+ */

+struct gl_renderbuffer *

+_mesa_new_renderbuffer(struct gl_context *ctx, GLuint name)

+{

+   struct gl_renderbuffer *rb = CALLOC_STRUCT(gl_renderbuffer);

+   if (rb) {

+      _mesa_init_renderbuffer(rb, name);

+   }

+   return rb;

+}

+

+

+/**

+ * Delete a gl_framebuffer.

+ * This is the default function for renderbuffer->Delete().

+ */

+void

+_mesa_delete_renderbuffer(struct gl_renderbuffer *rb)

+{

+   if (rb->Data) {

+      free(rb->Data);

+   }

+   free(rb);

+}

+

+

+/**

+ * Allocate a software-based renderbuffer.  This is called via the

+ * ctx->Driver.NewRenderbuffer() function when the user creates a new

+ * renderbuffer.

+ * This would not be used for hardware-based renderbuffers.

+ */

+struct gl_renderbuffer *

+_mesa_new_soft_renderbuffer(struct gl_context *ctx, GLuint name)

+{

+   struct gl_renderbuffer *rb = _mesa_new_renderbuffer(ctx, name);

+   if (rb) {

+      rb->AllocStorage = _mesa_soft_renderbuffer_storage;

+      /* Normally, one would setup the PutRow, GetRow, etc functions here.

+       * But we're doing that in the _mesa_soft_renderbuffer_storage() function

+       * instead.

+       */

+   }

+   return rb;

+}

+

+

+/**

+ * Add software-based color renderbuffers to the given framebuffer.

+ * This is a helper routine for device drivers when creating a

+ * window system framebuffer (not a user-created render/framebuffer).

+ * Once this function is called, you can basically forget about this

+ * renderbuffer; core Mesa will handle all the buffer management and

+ * rendering!

+ */

+GLboolean

+_mesa_add_color_renderbuffers(struct gl_context *ctx, struct gl_framebuffer *fb,

+                              GLuint rgbBits, GLuint alphaBits,

+                              GLboolean frontLeft, GLboolean backLeft,

+                              GLboolean frontRight, GLboolean backRight)

+{

+   GLuint b;

+

+   if (rgbBits > 16 || alphaBits > 16) {

+      _mesa_problem(ctx,

+                    "Unsupported bit depth in _mesa_add_color_renderbuffers");

+      return GL_FALSE;

+   }

+

+   assert(MAX_COLOR_ATTACHMENTS >= 4);

+

+   for (b = BUFFER_FRONT_LEFT; b <= BUFFER_BACK_RIGHT; b++) {

+      struct gl_renderbuffer *rb;

+

+      if (b == BUFFER_FRONT_LEFT && !frontLeft)

+         continue;

+      else if (b == BUFFER_BACK_LEFT && !backLeft)

+         continue;

+      else if (b == BUFFER_FRONT_RIGHT && !frontRight)

+         continue;

+      else if (b == BUFFER_BACK_RIGHT && !backRight)

+         continue;

+

+      assert(fb->Attachment[b].Renderbuffer == NULL);

+

+      rb = _mesa_new_renderbuffer(ctx, 0);

+      if (!rb) {

+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating color buffer");

+         return GL_FALSE;

+      }

+

+      if (rgbBits <= 8) {

+         if (alphaBits)

+            rb->Format = MESA_FORMAT_RGBA8888;

+         else

+            rb->Format = MESA_FORMAT_RGB888;

+      }

+      else {

+         assert(rgbBits <= 16);

+         rb->Format = MESA_FORMAT_NONE; /*XXX RGBA16;*/

+      }

+      rb->InternalFormat = GL_RGBA;

+

+      rb->AllocStorage = _mesa_soft_renderbuffer_storage;

+      _mesa_add_renderbuffer(fb, b, rb);

+   }

+

+   return GL_TRUE;

+}

+

+

+/**

+ * Add software-based alpha renderbuffers to the given framebuffer.

+ * This is a helper routine for device drivers when creating a

+ * window system framebuffer (not a user-created render/framebuffer).

+ * Once this function is called, you can basically forget about this

+ * renderbuffer; core Mesa will handle all the buffer management and

+ * rendering!

+ */

+GLboolean

+_mesa_add_alpha_renderbuffers(struct gl_context *ctx, struct gl_framebuffer *fb,

+                              GLuint alphaBits,

+                              GLboolean frontLeft, GLboolean backLeft,

+                              GLboolean frontRight, GLboolean backRight)

+{

+   GLuint b;

+

+   /* for window system framebuffers only! */

+   assert(fb->Name == 0);

+

+   if (alphaBits > 8) {

+      _mesa_problem(ctx,

+                    "Unsupported bit depth in _mesa_add_alpha_renderbuffers");

+      return GL_FALSE;

+   }

+

+   assert(MAX_COLOR_ATTACHMENTS >= 4);

+

+   /* Wrap each of the RGB color buffers with an alpha renderbuffer.

+    */

+   for (b = BUFFER_FRONT_LEFT; b <= BUFFER_BACK_RIGHT; b++) {

+      struct gl_renderbuffer *arb;

+

+      if (b == BUFFER_FRONT_LEFT && !frontLeft)

+         continue;

+      else if (b == BUFFER_BACK_LEFT && !backLeft)

+         continue;

+      else if (b == BUFFER_FRONT_RIGHT && !frontRight)

+         continue;

+      else if (b == BUFFER_BACK_RIGHT && !backRight)

+         continue;

+

+      /* the RGB buffer to wrap must already exist!! */

+      assert(fb->Attachment[b].Renderbuffer);

+

+      /* only GLubyte supported for now */

+      assert(fb->Attachment[b].Renderbuffer->DataType == GL_UNSIGNED_BYTE);

+

+      /* allocate alpha renderbuffer */

+      arb = _mesa_new_renderbuffer(ctx, 0);

+      if (!arb) {

+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating alpha buffer");

+         return GL_FALSE;

+      }

+

+      /* wrap the alpha renderbuffer around the RGB renderbuffer */

+      arb->Wrapped = fb->Attachment[b].Renderbuffer;

+

+      /* Set up my alphabuffer fields and plug in my functions.

+       * The functions will put/get the alpha values from/to RGBA arrays

+       * and then call the wrapped buffer's functions to handle the RGB

+       * values.

+       */

+      arb->InternalFormat = arb->Wrapped->InternalFormat;

+      arb->Format         = MESA_FORMAT_A8;

+      arb->DataType       = arb->Wrapped->DataType;

+      arb->AllocStorage   = alloc_storage_alpha8;

+      arb->Delete         = delete_renderbuffer_alpha8;

+      arb->GetPointer     = get_pointer_alpha8;

+      arb->GetRow         = get_row_alpha8;

+      arb->GetValues      = get_values_alpha8;

+      arb->PutRow         = put_row_alpha8;

+      arb->PutRowRGB      = put_row_rgb_alpha8;

+      arb->PutMonoRow     = put_mono_row_alpha8;

+      arb->PutValues      = put_values_alpha8;

+      arb->PutMonoValues  = put_mono_values_alpha8;

+

+      /* clear the pointer to avoid assertion/sanity check failure later */

+      fb->Attachment[b].Renderbuffer = NULL;

+

+      /* plug the alpha renderbuffer into the colorbuffer attachment */

+      _mesa_add_renderbuffer(fb, b, arb);

+   }

+

+   return GL_TRUE;

+}

+

+

+/**

+ * For framebuffers that use a software alpha channel wrapper

+ * created by _mesa_add_alpha_renderbuffer or _mesa_add_soft_renderbuffers,

+ * copy the back buffer alpha channel into the front buffer alpha channel.

+ */

+void

+_mesa_copy_soft_alpha_renderbuffers(struct gl_context *ctx, struct gl_framebuffer *fb)

+{

+   if (fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer &&

+       fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer)

+      copy_buffer_alpha8(fb->Attachment[BUFFER_FRONT_LEFT].Renderbuffer,

+                         fb->Attachment[BUFFER_BACK_LEFT].Renderbuffer);

+

+

+   if (fb->Attachment[BUFFER_FRONT_RIGHT].Renderbuffer &&

+       fb->Attachment[BUFFER_BACK_RIGHT].Renderbuffer)

+      copy_buffer_alpha8(fb->Attachment[BUFFER_FRONT_RIGHT].Renderbuffer,

+                         fb->Attachment[BUFFER_BACK_RIGHT].Renderbuffer);

+}

+

+

+/**

+ * Add a software-based depth renderbuffer to the given framebuffer.

+ * This is a helper routine for device drivers when creating a

+ * window system framebuffer (not a user-created render/framebuffer).

+ * Once this function is called, you can basically forget about this

+ * renderbuffer; core Mesa will handle all the buffer management and

+ * rendering!

+ */

+GLboolean

+_mesa_add_depth_renderbuffer(struct gl_context *ctx, struct gl_framebuffer *fb,

+                             GLuint depthBits)

+{

+   struct gl_renderbuffer *rb;

+

+   if (depthBits > 32) {

+      _mesa_problem(ctx,

+                    "Unsupported depthBits in _mesa_add_depth_renderbuffer");

+      return GL_FALSE;

+   }

+

+   assert(fb->Attachment[BUFFER_DEPTH].Renderbuffer == NULL);

+

+   rb = _mesa_new_renderbuffer(ctx, 0);

+   if (!rb) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating depth buffer");

+      return GL_FALSE;

+   }

+

+   if (depthBits <= 16) {

+      rb->Format = MESA_FORMAT_Z16;

+      rb->InternalFormat = GL_DEPTH_COMPONENT16;

+   }

+   else if (depthBits <= 24) {

+      rb->Format = MESA_FORMAT_X8_Z24;

+      rb->InternalFormat = GL_DEPTH_COMPONENT24;

+   }

+   else {

+      rb->Format = MESA_FORMAT_Z32;

+      rb->InternalFormat = GL_DEPTH_COMPONENT32;

+   }

+

+   rb->AllocStorage = _mesa_soft_renderbuffer_storage;

+   _mesa_add_renderbuffer(fb, BUFFER_DEPTH, rb);

+

+   return GL_TRUE;

+}

+

+

+/**

+ * Add a software-based stencil renderbuffer to the given framebuffer.

+ * This is a helper routine for device drivers when creating a

+ * window system framebuffer (not a user-created render/framebuffer).

+ * Once this function is called, you can basically forget about this

+ * renderbuffer; core Mesa will handle all the buffer management and

+ * rendering!

+ */

+GLboolean

+_mesa_add_stencil_renderbuffer(struct gl_context *ctx, struct gl_framebuffer *fb,

+                               GLuint stencilBits)

+{

+   struct gl_renderbuffer *rb;

+

+   if (stencilBits > 16) {

+      _mesa_problem(ctx,

+                  "Unsupported stencilBits in _mesa_add_stencil_renderbuffer");

+      return GL_FALSE;

+   }

+

+   assert(fb->Attachment[BUFFER_STENCIL].Renderbuffer == NULL);

+

+   rb = _mesa_new_renderbuffer(ctx, 0);

+   if (!rb) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating stencil buffer");

+      return GL_FALSE;

+   }

+

+   assert(stencilBits <= 8);

+   rb->Format = MESA_FORMAT_S8;

+   rb->InternalFormat = GL_STENCIL_INDEX8;

+

+   rb->AllocStorage = _mesa_soft_renderbuffer_storage;

+   _mesa_add_renderbuffer(fb, BUFFER_STENCIL, rb);

+

+   return GL_TRUE;

+}

+

+

+/**

+ * Add a software-based accumulation renderbuffer to the given framebuffer.

+ * This is a helper routine for device drivers when creating a

+ * window system framebuffer (not a user-created render/framebuffer).

+ * Once this function is called, you can basically forget about this

+ * renderbuffer; core Mesa will handle all the buffer management and

+ * rendering!

+ */

+GLboolean

+_mesa_add_accum_renderbuffer(struct gl_context *ctx, struct gl_framebuffer *fb,

+                             GLuint redBits, GLuint greenBits,

+                             GLuint blueBits, GLuint alphaBits)

+{

+   struct gl_renderbuffer *rb;

+

+   if (redBits > 16 || greenBits > 16 || blueBits > 16 || alphaBits > 16) {

+      _mesa_problem(ctx,

+                    "Unsupported accumBits in _mesa_add_accum_renderbuffer");

+      return GL_FALSE;

+   }

+

+   assert(fb->Attachment[BUFFER_ACCUM].Renderbuffer == NULL);

+

+   rb = _mesa_new_renderbuffer(ctx, 0);

+   if (!rb) {

+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating accum buffer");

+      return GL_FALSE;

+   }

+

+   rb->Format = MESA_FORMAT_SIGNED_RGBA_16;

+   rb->InternalFormat = GL_RGBA16_SNORM;

+   rb->AllocStorage = _mesa_soft_renderbuffer_storage;

+   _mesa_add_renderbuffer(fb, BUFFER_ACCUM, rb);

+

+   return GL_TRUE;

+}

+

+

+

+/**

+ * Add a software-based aux renderbuffer to the given framebuffer.

+ * This is a helper routine for device drivers when creating a

+ * window system framebuffer (not a user-created render/framebuffer).

+ * Once this function is called, you can basically forget about this

+ * renderbuffer; core Mesa will handle all the buffer management and

+ * rendering!

+ *

+ * NOTE: color-index aux buffers not supported.

+ */

+GLboolean

+_mesa_add_aux_renderbuffers(struct gl_context *ctx, struct gl_framebuffer *fb,

+                            GLuint colorBits, GLuint numBuffers)

+{

+   GLuint i;

+

+   if (colorBits > 16) {

+      _mesa_problem(ctx,

+                    "Unsupported accumBits in _mesa_add_aux_renderbuffers");

+      return GL_FALSE;

+   }

+

+   assert(numBuffers <= MAX_AUX_BUFFERS);

+

+   for (i = 0; i < numBuffers; i++) {

+      struct gl_renderbuffer *rb = _mesa_new_renderbuffer(ctx, 0);

+

+      assert(fb->Attachment[BUFFER_AUX0 + i].Renderbuffer == NULL);

+

+      if (!rb) {

+         _mesa_error(ctx, GL_OUT_OF_MEMORY, "Allocating aux buffer");

+         return GL_FALSE;

+      }

+

+      assert (colorBits <= 8);

+      rb->Format = MESA_FORMAT_RGBA8888;

+      rb->InternalFormat = GL_RGBA;

+

+      rb->AllocStorage = _mesa_soft_renderbuffer_storage;

+      _mesa_add_renderbuffer(fb, BUFFER_AUX0 + i, rb);

+   }

+   return GL_TRUE;

+}

+

+

+/**

+ * Create/attach software-based renderbuffers to the given framebuffer.

+ * This is a helper routine for device drivers.  Drivers can just as well

+ * call the individual _mesa_add_*_renderbuffer() routines directly.

+ */

+void

+_mesa_add_soft_renderbuffers(struct gl_framebuffer *fb,

+                             GLboolean color,

+                             GLboolean depth,

+                             GLboolean stencil,

+                             GLboolean accum,

+                             GLboolean alpha,

+                             GLboolean aux)

+{

+   GLboolean frontLeft = GL_TRUE;

+   GLboolean backLeft = fb->Visual.doubleBufferMode;

+   GLboolean frontRight = fb->Visual.stereoMode;

+   GLboolean backRight = fb->Visual.stereoMode && fb->Visual.doubleBufferMode;

+

+   if (color) {

+      assert(fb->Visual.redBits == fb->Visual.greenBits);

+      assert(fb->Visual.redBits == fb->Visual.blueBits);

+      _mesa_add_color_renderbuffers(NULL, fb,

+				    fb->Visual.redBits,

+				    fb->Visual.alphaBits,

+				    frontLeft, backLeft,

+				    frontRight, backRight);

+   }

+

+   if (depth) {

+      assert(fb->Visual.depthBits > 0);

+      _mesa_add_depth_renderbuffer(NULL, fb, fb->Visual.depthBits);

+   }

+

+   if (stencil) {

+      assert(fb->Visual.stencilBits > 0);

+      _mesa_add_stencil_renderbuffer(NULL, fb, fb->Visual.stencilBits);

+   }

+

+   if (accum) {

+      assert(fb->Visual.accumRedBits > 0);

+      assert(fb->Visual.accumGreenBits > 0);

+      assert(fb->Visual.accumBlueBits > 0);

+      _mesa_add_accum_renderbuffer(NULL, fb,

+                                   fb->Visual.accumRedBits,

+                                   fb->Visual.accumGreenBits,

+                                   fb->Visual.accumBlueBits,

+                                   fb->Visual.accumAlphaBits);

+   }

+

+   if (aux) {

+      assert(fb->Visual.numAuxBuffers > 0);

+      _mesa_add_aux_renderbuffers(NULL, fb, fb->Visual.redBits,

+                                  fb->Visual.numAuxBuffers);

+   }

+

+   if (alpha) {

+      assert(fb->Visual.alphaBits > 0);

+      _mesa_add_alpha_renderbuffers(NULL, fb, fb->Visual.alphaBits,

+                                    frontLeft, backLeft,

+                                    frontRight, backRight);

+   }

+

+#if 0

+   if (multisample) {

+      /* maybe someday */

+   }

+#endif

+}

+

+

+/**

+ * Attach a renderbuffer to a framebuffer.

+ */

+void

+_mesa_add_renderbuffer(struct gl_framebuffer *fb,

+                       GLuint bufferName, struct gl_renderbuffer *rb)

+{

+   assert(fb);

+   assert(rb);

+   assert(bufferName < BUFFER_COUNT);

+

+   /* There should be no previous renderbuffer on this attachment point,

+    * with the exception of depth/stencil since the same renderbuffer may

+    * be used for both.

+    */

+   assert(bufferName == BUFFER_DEPTH ||

+          bufferName == BUFFER_STENCIL ||

+          fb->Attachment[bufferName].Renderbuffer == NULL);

+

+   /* winsys vs. user-created buffer cross check */

+   if (fb->Name) {

+      assert(rb->Name);

+   }

+   else {

+      assert(!rb->Name);

+   }

+

+   fb->Attachment[bufferName].Type = GL_RENDERBUFFER_EXT;

+   fb->Attachment[bufferName].Complete = GL_TRUE;

+   _mesa_reference_renderbuffer(&fb->Attachment[bufferName].Renderbuffer, rb);

+}

+

+

+/**

+ * Remove the named renderbuffer from the given framebuffer.

+ */

+void

+_mesa_remove_renderbuffer(struct gl_framebuffer *fb, GLuint bufferName)

+{

+   struct gl_renderbuffer *rb;

+

+   assert(bufferName < BUFFER_COUNT);

+

+   rb = fb->Attachment[bufferName].Renderbuffer;

+   if (!rb)

+      return;

+

+   _mesa_reference_renderbuffer(&rb, NULL);

+

+   fb->Attachment[bufferName].Renderbuffer = NULL;

+}

+

+

+/**

+ * Set *ptr to point to rb.  If *ptr points to another renderbuffer,

+ * dereference that buffer first.  The new renderbuffer's refcount will

+ * be incremented.  The old renderbuffer's refcount will be decremented.

+ */

+void

+_mesa_reference_renderbuffer(struct gl_renderbuffer **ptr,

+                             struct gl_renderbuffer *rb)

+{

+   assert(ptr);

+   if (*ptr == rb) {

+      /* no change */

+      return;

+   }

+

+   if (*ptr) {

+      /* Unreference the old renderbuffer */

+      GLboolean deleteFlag = GL_FALSE;

+      struct gl_renderbuffer *oldRb = *ptr;

+

+      assert(oldRb->Magic == RB_MAGIC);

+      _glthread_LOCK_MUTEX(oldRb->Mutex);

+      assert(oldRb->Magic == RB_MAGIC);

+      ASSERT(oldRb->RefCount > 0);

+      oldRb->RefCount--;

+      /*printf("RB DECR %p (%d) to %d\n", (void*) oldRb, oldRb->Name, oldRb->RefCount);*/

+      deleteFlag = (oldRb->RefCount == 0);

+      _glthread_UNLOCK_MUTEX(oldRb->Mutex);

+

+      if (deleteFlag) {

+         oldRb->Magic = 0; /* now invalid memory! */

+         oldRb->Delete(oldRb);

+      }

+

+      *ptr = NULL;

+   }

+   assert(!*ptr);

+

+   if (rb) {

+      assert(rb->Magic == RB_MAGIC);

+      /* reference new renderbuffer */

+      _glthread_LOCK_MUTEX(rb->Mutex);

+      rb->RefCount++;

+      /*printf("RB INCR %p (%d) to %d\n", (void*) rb, rb->Name, rb->RefCount);*/

+      _glthread_UNLOCK_MUTEX(rb->Mutex);

+      *ptr = rb;

+   }

+}

+

+

+/**

+ * Create a new combined depth/stencil renderbuffer for implementing

+ * the GL_EXT_packed_depth_stencil extension.

+ * \return new depth/stencil renderbuffer

+ */

+struct gl_renderbuffer *

+_mesa_new_depthstencil_renderbuffer(struct gl_context *ctx, GLuint name)

+{

+   struct gl_renderbuffer *dsrb;

+

+   dsrb = _mesa_new_renderbuffer(ctx, name);

+   if (!dsrb)

+      return NULL;

+

+   /* init fields not covered by _mesa_new_renderbuffer() */

+   dsrb->InternalFormat = GL_DEPTH24_STENCIL8_EXT;

+   dsrb->Format = MESA_FORMAT_Z24_S8;

+   dsrb->AllocStorage = _mesa_soft_renderbuffer_storage;

+

+   return dsrb;

+}