Synchronised line endinge with release branch

1 files changed, 1114 insertions, 1114 deletions

diff --git a/mesalib/src/mesa/main/depthstencil.c b/mesalib/src/mesa/main/depthstencil.c
index 1fdd1cc0e..40d6c9612 100644
--- a/mesalib/src/mesa/main/depthstencil.c
+++ b/mesalib/src/mesa/main/depthstencil.c
@@ -1,1114 +1,1114 @@
-/*

- * 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.

- */

-

-#include "glheader.h"

-#include "imports.h"

-#include "context.h"

-#include "formats.h"

-#include "mtypes.h"

-#include "depthstencil.h"

-#include "renderbuffer.h"

-

-

-/**

- * Adaptor/wrappers for GL_DEPTH_STENCIL renderbuffers.

- *

- * The problem with a GL_DEPTH_STENCIL renderbuffer is that sometimes we

- * want to treat it as a stencil buffer, other times we want to treat it

- * as a depth/z buffer and still other times when we want to treat it as

- * a combined Z+stencil buffer!  That implies we need three different sets

- * of Get/Put functions.

- *

- * We solve this by wrapping the Z24_S8 or S8_Z24 renderbuffer with depth and

- * stencil adaptors, each with the right kind of depth/stencil Get/Put functions.

- */

-

-

-static void *

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

-{

-   (void) ctx;

-   (void) rb;

-   (void) x;

-   (void) y;

-   return NULL;

-}

-

-

-/**

- * Delete a depth or stencil wrapper renderbuffer.

- */

-static void

-delete_wrapper(struct gl_renderbuffer *rb)

-{

-   ASSERT(rb->Format == MESA_FORMAT_S8 ||

-          rb->Format == MESA_FORMAT_X8_Z24 ||

-          rb->Format == MESA_FORMAT_Z32_FLOAT);

-   _mesa_reference_renderbuffer(&rb->Wrapped, NULL);

-   free(rb);

-}

-

-

-/**

- * Realloc storage for wrapper.

- */

-static GLboolean

-alloc_wrapper_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,

-                      GLenum internalFormat, GLuint width, GLuint height)

-{

-   /* just pass this on to the wrapped renderbuffer */

-   struct gl_renderbuffer *dsrb = rb->Wrapped;

-   GLboolean retVal;

-

-   (void) internalFormat;

-

-   ASSERT(dsrb->Format == MESA_FORMAT_Z24_S8 ||

-          dsrb->Format == MESA_FORMAT_Z24_X8 ||

-          dsrb->Format == MESA_FORMAT_S8_Z24 ||

-          dsrb->Format == MESA_FORMAT_X8_Z24);

-

-   retVal = dsrb->AllocStorage(ctx, dsrb, dsrb->InternalFormat, width, height);

-   if (retVal) {

-      rb->Width = width;

-      rb->Height = height;

-      rb->RowStride = dsrb->RowStride;

-   }

-   return retVal;

-}

-

-

-

-

-/*======================================================================

- * Depth wrapper around depth/stencil renderbuffer

- */

-

-static void

-get_row_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,

-            GLint x, GLint y, void *values)

-{

-   struct gl_renderbuffer *dsrb = z24rb->Wrapped;

-   GLuint temp[MAX_WIDTH], i;

-   GLuint *dst = (GLuint *) values;

-   const GLuint *src = (const GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);

-   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-   if (!src) {

-      dsrb->GetRow(ctx, dsrb, count, x, y, temp);

-      src = temp;

-   }

-   if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

-         dst[i] = src[i] >> 8;

-      }

-   }

-   else {

-      assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

-         dst[i] = src[i] & 0xffffff;

-      }

-   }

-}

-

-static void

-get_values_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,

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

-{

-   struct gl_renderbuffer *dsrb = z24rb->Wrapped;

-   GLuint temp[MAX_WIDTH], i;

-   GLuint *dst = (GLuint *) values;

-   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-   ASSERT(count <= MAX_WIDTH);

-   /* don't bother trying direct access */

-   dsrb->GetValues(ctx, dsrb, count, x, y, temp);

-   if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

-         dst[i] = temp[i] >> 8;

-      }

-   }

-   else {

-      assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

-         dst[i] = temp[i] & 0xffffff;

-      }

-   }

-}

-

-static void

-put_row_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,

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

-{

-   struct gl_renderbuffer *dsrb = z24rb->Wrapped;

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

-   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);

-   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-   if (dst) {

-      /* direct access */

-      GLuint i;

-      if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               dst[i] = (src[i] << 8) | (dst[i] & 0xff);

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               dst[i] = (src[i] & 0xffffff) | (dst[i] & 0xff000000);

-            }

-         }

-      }

-   }

-   else {

-      /* get, modify, put */

-      GLuint temp[MAX_WIDTH], i;

-      dsrb->GetRow(ctx, dsrb, count, x, y, temp);

-      if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               temp[i] = (src[i] << 8) | (temp[i] & 0xff);

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               temp[i] = (src[i] & 0xffffff) | (temp[i] & 0xff000000);

-            }

-         }

-      }

-      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);

-   }

-}

-

-static void

-put_mono_row_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,

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

-{

-   struct gl_renderbuffer *dsrb = z24rb->Wrapped;

-   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);

-   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-   if (dst) {

-      /* direct access */

-      GLuint i;

-      if (dsrb->Format == MESA_FORMAT_Z24_S8) {

-         const GLuint shiftedVal = *((GLuint *) value) << 8;

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

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

-               dst[i] = shiftedVal | (dst[i] & 0xff);

-            }

-         }

-      }

-      else {

-         const GLuint shiftedVal = *((GLuint *) value);

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               dst[i] = shiftedVal | (dst[i] & 0xff000000);

-            }

-         }

-      }

-   }

-   else {

-      /* get, modify, put */

-      GLuint temp[MAX_WIDTH], i;

-      dsrb->GetRow(ctx, dsrb, count, x, y, temp);

-      if (dsrb->Format == MESA_FORMAT_Z24_S8) {

-         const GLuint shiftedVal = *((GLuint *) value) << 8;

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

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

-               temp[i] = shiftedVal | (temp[i] & 0xff);

-            }

-         }

-      }

-      else {

-         const GLuint shiftedVal = *((GLuint *) value);

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               temp[i] = shiftedVal | (temp[i] & 0xff000000);

-            }

-         }

-      }

-      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);

-   }

-}

-

-static void

-put_values_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,

-               const GLint x[], const GLint y[],

-               const void *values, const GLubyte *mask)

-{

-   struct gl_renderbuffer *dsrb = z24rb->Wrapped;

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

-   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-   if (dsrb->GetPointer(ctx, dsrb, 0, 0)) {

-      /* direct access */

-      GLuint i;

-      if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);

-               *dst = (src[i] << 8) | (*dst & 0xff);

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);

-               *dst = (src[i] & 0xffffff) | (*dst & 0xff000000);

-            }

-         }

-      }

-   }

-   else {

-      /* get, modify, put */

-      GLuint temp[MAX_WIDTH], i;

-      dsrb->GetValues(ctx, dsrb, count, x, y, temp);

-      if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               temp[i] = (src[i] << 8) | (temp[i] & 0xff);

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               temp[i] = (src[i] & 0xffffff) | (temp[i] & 0xff000000);

-            }

-         }

-      }

-      dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);

-   }

-}

-

-static void

-put_mono_values_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb,

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

-                    const void *value, const GLubyte *mask)

-{

-   struct gl_renderbuffer *dsrb = z24rb->Wrapped;

-   GLuint temp[MAX_WIDTH], i;

-   /* get, modify, put */

-   dsrb->GetValues(ctx, dsrb, count, x, y, temp);

-   if (dsrb->Format == MESA_FORMAT_Z24_S8) {

-      const GLuint shiftedVal = *((GLuint *) value) << 8;

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

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

-            temp[i] = shiftedVal | (temp[i] & 0xff);

-         }

-      }

-   }

-   else {

-      const GLuint shiftedVal = *((GLuint *) value);

-      assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-            temp[i] = shiftedVal | (temp[i] & 0xff000000);

-         }

-      }

-   }

-   dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);

-}

-

-

-/**

- * Wrap the given GL_DEPTH_STENCIL renderbuffer so that it acts like

- * a depth renderbuffer.

- * \return new depth renderbuffer

- */

-struct gl_renderbuffer *

-_mesa_new_z24_renderbuffer_wrapper(struct gl_context *ctx,

-                                   struct gl_renderbuffer *dsrb)

-{

-   struct gl_renderbuffer *z24rb;

-

-   ASSERT(dsrb->Format == MESA_FORMAT_Z24_S8 ||

-          dsrb->Format == MESA_FORMAT_Z24_X8 ||

-          dsrb->Format == MESA_FORMAT_S8_Z24 ||

-          dsrb->Format == MESA_FORMAT_X8_Z24);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-

-   z24rb = ctx->Driver.NewRenderbuffer(ctx, 0);

-   if (!z24rb)

-      return NULL;

-

-   /* NOTE: need to do manual refcounting here */

-   z24rb->Wrapped = dsrb;

-   dsrb->RefCount++;

-

-   z24rb->Name = dsrb->Name;

-   z24rb->RefCount = 0;

-   z24rb->Width = dsrb->Width;

-   z24rb->Height = dsrb->Height;

-   z24rb->RowStride = dsrb->RowStride;

-   z24rb->InternalFormat = GL_DEPTH_COMPONENT24;

-   z24rb->Format = MESA_FORMAT_X8_Z24;

-   z24rb->_BaseFormat = GL_DEPTH_COMPONENT;

-   z24rb->DataType = GL_UNSIGNED_INT;

-   z24rb->Data = NULL;

-   z24rb->Delete = delete_wrapper;

-   z24rb->AllocStorage = alloc_wrapper_storage;

-   z24rb->GetPointer = nop_get_pointer;

-   z24rb->GetRow = get_row_z24;

-   z24rb->GetValues = get_values_z24;

-   z24rb->PutRow = put_row_z24;

-   z24rb->PutRowRGB = NULL;

-   z24rb->PutMonoRow = put_mono_row_z24;

-   z24rb->PutValues = put_values_z24;

-   z24rb->PutMonoValues = put_mono_values_z24;

-

-   return z24rb;

-}

-

-

-static void

-get_row_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,

-             GLint x, GLint y, void *values)

-{

-   struct gl_renderbuffer *dsrb = z32frb->Wrapped;

-   GLfloat temp[MAX_WIDTH*2];

-   GLfloat *dst = (GLfloat *) values;

-   const GLfloat *src = (const GLfloat *) dsrb->GetPointer(ctx, dsrb, x, y);

-   GLuint i;

-   ASSERT(z32frb->DataType == GL_FLOAT);

-   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);

-   if (!src) {

-      dsrb->GetRow(ctx, dsrb, count, x, y, temp);

-      src = temp;

-   }

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

-      dst[i] = src[i*2];

-   }

-}

-

-static void

-get_values_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,

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

-{

-   struct gl_renderbuffer *dsrb = z32frb->Wrapped;

-   GLfloat temp[MAX_WIDTH*2];

-   GLfloat *dst = (GLfloat *) values;

-   GLuint i;

-   ASSERT(z32frb->DataType == GL_FLOAT);

-   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);

-   ASSERT(count <= MAX_WIDTH);

-   /* don't bother trying direct access */

-   dsrb->GetValues(ctx, dsrb, count, x, y, temp);

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

-      dst[i] = temp[i*2];

-   }

-}

-

-static void

-put_row_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,

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

-{

-   struct gl_renderbuffer *dsrb = z32frb->Wrapped;

-   const GLfloat *src = (const GLfloat *) values;

-   GLfloat *dst = (GLfloat *) dsrb->GetPointer(ctx, dsrb, x, y);

-   ASSERT(z32frb->DataType == GL_FLOAT);

-   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);

-   if (dst) {

-      /* direct access */

-      GLuint i;

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

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

-            dst[i*2] = src[i];

-         }

-      }

-   }

-   else {

-      /* get, modify, put */

-      GLfloat temp[MAX_WIDTH*2];

-      GLuint i;

-      dsrb->GetRow(ctx, dsrb, count, x, y, temp);

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

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

-            temp[i*2] = src[i];

-         }

-      }

-      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);

-   }

-}

-

-static void

-put_mono_row_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,

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

-{

-   struct gl_renderbuffer *dsrb = z32frb->Wrapped;

-   GLfloat *dst = (GLfloat *) dsrb->GetPointer(ctx, dsrb, x, y);

-   ASSERT(z32frb->DataType == GL_FLOAT);

-   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);

-   if (dst) {

-      /* direct access */

-      GLuint i;

-      const GLfloat val = *(GLfloat*)value;

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

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

-            dst[i*2] = val;

-         }

-      }

-   }

-   else {

-      /* get, modify, put */

-      GLfloat temp[MAX_WIDTH*2];

-      GLuint i;

-      const GLfloat val = *(GLfloat *)value;

-      dsrb->GetRow(ctx, dsrb, count, x, y, temp);

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

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

-            temp[i*2] = val;

-         }

-      }

-      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);

-   }

-}

-

-static void

-put_values_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,

-                const GLint x[], const GLint y[],

-                const void *values, const GLubyte *mask)

-{

-   struct gl_renderbuffer *dsrb = z32frb->Wrapped;

-   const GLfloat *src = (const GLfloat *) values;

-   ASSERT(z32frb->DataType == GL_FLOAT);

-   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);

-   if (dsrb->GetPointer(ctx, dsrb, 0, 0)) {

-      /* direct access */

-      GLuint i;

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

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

-            GLfloat *dst = (GLfloat *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);

-            *dst = src[i];

-         }

-      }

-   }

-   else {

-      /* get, modify, put */

-      GLfloat temp[MAX_WIDTH*2];

-      GLuint i;

-      dsrb->GetValues(ctx, dsrb, count, x, y, temp);

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

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

-            temp[i*2] = src[i];

-         }

-      }

-      dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);

-   }

-}

-

-static void

-put_mono_values_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb,

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

-                     const void *value, const GLubyte *mask)

-{

-   struct gl_renderbuffer *dsrb = z32frb->Wrapped;

-   GLfloat temp[MAX_WIDTH*2];

-   GLuint i;

-   const GLfloat val = *(GLfloat *)value;

-   ASSERT(z32frb->DataType == GL_FLOAT);

-   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);

-   /* get, modify, put */

-   dsrb->GetValues(ctx, dsrb, count, x, y, temp);

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

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

-         temp[i*2] = val;

-      }

-   }

-   dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);

-}

-

-

-/**

- * Wrap the given GL_DEPTH_STENCIL renderbuffer so that it acts like

- * a depth renderbuffer.

- * \return new depth renderbuffer

- */

-struct gl_renderbuffer *

-_mesa_new_z32f_renderbuffer_wrapper(struct gl_context *ctx,

-                                    struct gl_renderbuffer *dsrb)

-{

-   struct gl_renderbuffer *z32frb;

-

-   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);

-   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-

-   z32frb = ctx->Driver.NewRenderbuffer(ctx, 0);

-   if (!z32frb)

-      return NULL;

-

-   /* NOTE: need to do manual refcounting here */

-   z32frb->Wrapped = dsrb;

-   dsrb->RefCount++;

-

-   z32frb->Name = dsrb->Name;

-   z32frb->RefCount = 0;

-   z32frb->Width = dsrb->Width;

-   z32frb->Height = dsrb->Height;

-   z32frb->RowStride = dsrb->RowStride;

-   z32frb->InternalFormat = GL_DEPTH_COMPONENT32F;

-   z32frb->Format = MESA_FORMAT_Z32_FLOAT;

-   z32frb->_BaseFormat = GL_DEPTH_COMPONENT;

-   z32frb->DataType = GL_FLOAT;

-   z32frb->Data = NULL;

-   z32frb->Delete = delete_wrapper;

-   z32frb->AllocStorage = alloc_wrapper_storage;

-   z32frb->GetPointer = nop_get_pointer;

-   z32frb->GetRow = get_row_z32f;

-   z32frb->GetValues = get_values_z32f;

-   z32frb->PutRow = put_row_z32f;

-   z32frb->PutRowRGB = NULL;

-   z32frb->PutMonoRow = put_mono_row_z32f;

-   z32frb->PutValues = put_values_z32f;

-   z32frb->PutMonoValues = put_mono_values_z32f;

-

-   return z32frb;

-}

-

-

-/*======================================================================

- * Stencil wrapper around depth/stencil renderbuffer

- */

-

-static void

-get_row_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,

-           GLint x, GLint y, void *values)

-{

-   struct gl_renderbuffer *dsrb = s8rb->Wrapped;

-   GLuint temp[MAX_WIDTH*2], i;

-   GLubyte *dst = (GLubyte *) values;

-   const GLuint *src = (const GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);

-   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||

-          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   if (!src) {

-      dsrb->GetRow(ctx, dsrb, count, x, y, temp);

-      src = temp;

-   }

-   if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {

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

-         dst[i] = src[i*2+1] & 0xff;

-      }

-   }

-   else if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

-         dst[i] = src[i] & 0xff;

-      }

-   }

-   else {

-      assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

-         dst[i] = src[i] >> 24;

-      }

-   }

-}

-

-static void

-get_values_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,

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

-{

-   struct gl_renderbuffer *dsrb = s8rb->Wrapped;

-   GLuint temp[MAX_WIDTH*2], i;

-   GLubyte *dst = (GLubyte *) values;

-   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||

-          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   ASSERT(count <= MAX_WIDTH);

-   /* don't bother trying direct access */

-   dsrb->GetValues(ctx, dsrb, count, x, y, temp);

-   if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {

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

-         dst[i] = temp[i*2+1] & 0xff;

-      }

-   }

-   else if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

-         dst[i] = temp[i] & 0xff;

-      }

-   }

-   else {

-      assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

-         dst[i] = temp[i] >> 24;

-      }

-   }

-}

-

-static void

-put_row_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,

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

-{

-   struct gl_renderbuffer *dsrb = s8rb->Wrapped;

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

-   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);

-   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||

-          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   if (dst) {

-      /* direct access */

-      GLuint i;

-      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {

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

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

-               dst[i*2+1] = src[i];

-            }

-         }

-      }

-      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               dst[i] = (dst[i] & 0xffffff00) | src[i];

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               dst[i] = (dst[i] & 0xffffff) | (src[i] << 24);

-            }

-         }

-      }

-   }

-   else {

-      /* get, modify, put */

-      GLuint temp[MAX_WIDTH*2], i;

-      dsrb->GetRow(ctx, dsrb, count, x, y, temp);

-      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {

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

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

-               temp[i*2+1] = src[i];

-            }

-         }

-      }

-      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               temp[i] = (temp[i] & 0xffffff00) | src[i];

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               temp[i] = (temp[i] & 0xffffff) | (src[i] << 24);

-            }

-         }

-      }

-      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);

-   }

-}

-

-static void

-put_mono_row_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,

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

-{

-   struct gl_renderbuffer *dsrb = s8rb->Wrapped;

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

-   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);

-   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||

-          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   if (dst) {

-      /* direct access */

-      GLuint i;

-      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {

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

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

-               dst[i*2+1] = val;

-            }

-         }

-      }

-      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               dst[i] = (dst[i] & 0xffffff00) | val;

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               dst[i] = (dst[i] & 0xffffff) | (val << 24);

-            }

-         }

-      }

-   }

-   else {

-      /* get, modify, put */

-      GLuint temp[MAX_WIDTH*2], i;

-      dsrb->GetRow(ctx, dsrb, count, x, y, temp);

-      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {

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

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

-               temp[i*2+1] = val;

-            }

-         }

-      }

-      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               temp[i] = (temp[i] & 0xffffff00) | val;

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               temp[i] = (temp[i] & 0xffffff) | (val << 24);

-            }

-         }

-      }

-      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);

-   }

-}

-

-static void

-put_values_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,

-              const GLint x[], const GLint y[],

-              const void *values, const GLubyte *mask)

-{

-   struct gl_renderbuffer *dsrb = s8rb->Wrapped;

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

-   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||

-          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-   if (dsrb->GetPointer(ctx, dsrb, 0, 0)) {

-      /* direct access */

-      GLuint i;

-      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {

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

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

-               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);

-               dst[1] = src[i];

-            }

-         }

-      }

-      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);

-               *dst = (*dst & 0xffffff00) | src[i];

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);

-               *dst = (*dst & 0xffffff) | (src[i] << 24);

-            }

-         }

-      }

-   }

-   else {

-      /* get, modify, put */

-      GLuint temp[MAX_WIDTH*2], i;

-      dsrb->GetValues(ctx, dsrb, count, x, y, temp);

-      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {

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

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

-               temp[i*2+1] = src[i];

-            }

-         }

-      }

-      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-               temp[i] = (temp[i] & 0xffffff00) | src[i];

-            }

-         }

-      }

-      else {

-         assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-               temp[i] = (temp[i] & 0xffffff) | (src[i] << 24);

-            }

-         }

-      }

-      dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);

-   }

-}

-

-static void

-put_mono_values_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,

-                   const GLint x[], const GLint y[],

-                   const void *value, const GLubyte *mask)

-{

-   struct gl_renderbuffer *dsrb = s8rb->Wrapped;

-   GLuint temp[MAX_WIDTH*2], i;

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

-   /* get, modify, put */

-   dsrb->GetValues(ctx, dsrb, count, x, y, temp);

-   if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {

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

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

-            temp[i*2+1] = val;

-         }

-      }

-   }

-   else if (dsrb->Format == MESA_FORMAT_Z24_S8) {

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

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

-            temp[i] = (temp[i] & 0xffffff00) | val;

-         }

-      }

-   }

-   else {

-      assert(dsrb->Format == MESA_FORMAT_S8_Z24);

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

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

-            temp[i] = (temp[i] & 0xffffff) | (val << 24);

-         }

-      }

-   }

-   dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);

-}

-

-

-/**

- * Wrap the given GL_DEPTH_STENCIL renderbuffer so that it acts like

- * a stencil renderbuffer.

- * \return new stencil renderbuffer

- */

-struct gl_renderbuffer *

-_mesa_new_s8_renderbuffer_wrapper(struct gl_context *ctx, struct gl_renderbuffer *dsrb)

-{

-   struct gl_renderbuffer *s8rb;

-

-   ASSERT(dsrb->Format == MESA_FORMAT_Z24_S8 ||

-          dsrb->Format == MESA_FORMAT_S8_Z24 ||

-          dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);

-   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||

-          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);

-

-   s8rb = ctx->Driver.NewRenderbuffer(ctx, 0);

-   if (!s8rb)

-      return NULL;

-

-   /* NOTE: need to do manual refcounting here */

-   s8rb->Wrapped = dsrb;

-   dsrb->RefCount++;

-

-   s8rb->Name = dsrb->Name;

-   s8rb->RefCount = 0;

-   s8rb->Width = dsrb->Width;

-   s8rb->Height = dsrb->Height;

-   s8rb->RowStride = dsrb->RowStride;

-   s8rb->InternalFormat = GL_STENCIL_INDEX8_EXT;

-   s8rb->Format = MESA_FORMAT_S8;

-   s8rb->_BaseFormat = GL_STENCIL_INDEX;

-   s8rb->DataType = GL_UNSIGNED_BYTE;

-   s8rb->Data = NULL;

-   s8rb->Delete = delete_wrapper;

-   s8rb->AllocStorage = alloc_wrapper_storage;

-   s8rb->GetPointer = nop_get_pointer;

-   s8rb->GetRow = get_row_s8;

-   s8rb->GetValues = get_values_s8;

-   s8rb->PutRow = put_row_s8;

-   s8rb->PutRowRGB = NULL;

-   s8rb->PutMonoRow = put_mono_row_s8;

-   s8rb->PutValues = put_values_s8;

-   s8rb->PutMonoValues = put_mono_values_s8;

-

-   return s8rb;

-}

-

-

-

-/**

- ** The following functions are useful for hardware drivers that only

- ** implement combined depth/stencil buffers.

- ** The GL_EXT_framebuffer_object extension allows indepedent depth and

- ** stencil buffers to be used in any combination.

- ** Therefore, we sometimes have to merge separate depth and stencil

- ** renderbuffers into a single depth+stencil renderbuffer.  And sometimes

- ** we have to split combined depth+stencil renderbuffers into separate

- ** renderbuffers.

- **/

-

-

-/**

- * Extract stencil values from the combined depth/stencil renderbuffer, storing

- * the values into a separate stencil renderbuffer.

- * \param dsRb  the source depth/stencil renderbuffer

- * \param stencilRb  the destination stencil renderbuffer

- *                   (either 8-bit or 32-bit)

- */

-void

-_mesa_extract_stencil(struct gl_context *ctx,

-                      struct gl_renderbuffer *dsRb,

-                      struct gl_renderbuffer *stencilRb)

-{

-   GLuint row, width, height;

-

-   ASSERT(dsRb);

-   ASSERT(stencilRb);

-

-   ASSERT(dsRb->Format == MESA_FORMAT_Z24_S8);

-   ASSERT(dsRb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-   ASSERT(stencilRb->Format == MESA_FORMAT_Z24_S8 ||

-          stencilRb->Format == MESA_FORMAT_S8);

-   ASSERT(dsRb->Width == stencilRb->Width);

-   ASSERT(dsRb->Height == stencilRb->Height);

-

-   width = dsRb->Width;

-   height = dsRb->Height;

-

-   for (row = 0; row < height; row++) {

-      GLuint depthStencil[MAX_WIDTH];

-      dsRb->GetRow(ctx, dsRb, width, 0, row, depthStencil);

-      if (stencilRb->Format == MESA_FORMAT_S8) {

-         /* 8bpp stencil */

-         GLubyte stencil[MAX_WIDTH];

-         GLuint i;

-         for (i = 0; i < width; i++) {

-            stencil[i] = depthStencil[i] & 0xff;

-         }

-         stencilRb->PutRow(ctx, stencilRb, width, 0, row, stencil, NULL);

-      }

-      else {

-         /* 32bpp stencil */

-         /* the 24 depth bits will be ignored */

-         ASSERT(stencilRb->Format == MESA_FORMAT_Z24_S8);

-         ASSERT(stencilRb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-         stencilRb->PutRow(ctx, stencilRb, width, 0, row, depthStencil, NULL);

-      }

-   }

-}

-

-

-/**

- * Copy stencil values from a stencil renderbuffer into a combined

- * depth/stencil renderbuffer.

- * \param dsRb  the destination depth/stencil renderbuffer

- * \param stencilRb  the source stencil buffer (either 8-bit or 32-bit)

- */

-void

-_mesa_insert_stencil(struct gl_context *ctx,

-                     struct gl_renderbuffer *dsRb,

-                     struct gl_renderbuffer *stencilRb)

-{

-   GLuint row, width, height;

-

-   ASSERT(dsRb);

-   ASSERT(stencilRb);

-

-   ASSERT(dsRb->Format == MESA_FORMAT_Z24_S8);

-   ASSERT(dsRb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-   ASSERT(stencilRb->Format == MESA_FORMAT_Z24_S8 ||

-          stencilRb->Format == MESA_FORMAT_S8);

-

-   ASSERT(dsRb->Width == stencilRb->Width);

-   ASSERT(dsRb->Height == stencilRb->Height);

-

-   width = dsRb->Width;

-   height = dsRb->Height;

-

-   for (row = 0; row < height; row++) {

-      GLuint depthStencil[MAX_WIDTH];

-

-      dsRb->GetRow(ctx, dsRb, width, 0, row, depthStencil);

-

-      if (stencilRb->Format == MESA_FORMAT_S8) {

-         /* 8bpp stencil */

-         GLubyte stencil[MAX_WIDTH];

-         GLuint i;

-         stencilRb->GetRow(ctx, stencilRb, width, 0, row, stencil);

-         for (i = 0; i < width; i++) {

-            depthStencil[i] = (depthStencil[i] & 0xffffff00) | stencil[i];

-         }

-      }

-      else {

-         /* 32bpp stencil buffer */

-         GLuint stencil[MAX_WIDTH], i;

-         ASSERT(stencilRb->Format == MESA_FORMAT_Z24_S8);

-         ASSERT(stencilRb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-         stencilRb->GetRow(ctx, stencilRb, width, 0, row, stencil);

-         for (i = 0; i < width; i++) {

-            depthStencil[i]

-               = (depthStencil[i] & 0xffffff00) | (stencil[i] & 0xff);

-         }

-      }

-

-      dsRb->PutRow(ctx, dsRb, width, 0, row, depthStencil, NULL);

-   }

-}

-

-

-/**

- * Convert the stencil buffer from 8bpp to 32bpp depth/stencil.

- * \param stencilRb  the stencil renderbuffer to promote

- */

-void

-_mesa_promote_stencil(struct gl_context *ctx, struct gl_renderbuffer *stencilRb)

-{

-   const GLsizei width = stencilRb->Width;

-   const GLsizei height = stencilRb->Height;

-   GLubyte *data;

-   GLint i, j, k;

-

-   ASSERT(stencilRb->Format == MESA_FORMAT_S8);

-   ASSERT(stencilRb->Data);

-

-   data = (GLubyte *) stencilRb->Data;

-   stencilRb->Data = NULL;

-   stencilRb->AllocStorage(ctx, stencilRb, GL_DEPTH24_STENCIL8_EXT,

-                           width, height);

-

-   ASSERT(stencilRb->DataType == GL_UNSIGNED_INT_24_8_EXT);

-

-   k = 0;

-   for (i = 0; i < height; i++) {

-      GLuint depthStencil[MAX_WIDTH];

-      for (j = 0; j < width; j++) {

-         depthStencil[j] = data[k++];

-      }

-      stencilRb->PutRow(ctx, stencilRb, width, 0, i, depthStencil, NULL);

-   }

-   free(data);

-}

+/*
+ * 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.
+ */
+
+#include "glheader.h"
+#include "imports.h"
+#include "context.h"
+#include "formats.h"
+#include "mtypes.h"
+#include "depthstencil.h"
+#include "renderbuffer.h"
+
+
+/**
+ * Adaptor/wrappers for GL_DEPTH_STENCIL renderbuffers.
+ *
+ * The problem with a GL_DEPTH_STENCIL renderbuffer is that sometimes we
+ * want to treat it as a stencil buffer, other times we want to treat it
+ * as a depth/z buffer and still other times when we want to treat it as
+ * a combined Z+stencil buffer!  That implies we need three different sets
+ * of Get/Put functions.
+ *
+ * We solve this by wrapping the Z24_S8 or S8_Z24 renderbuffer with depth and
+ * stencil adaptors, each with the right kind of depth/stencil Get/Put functions.
+ */
+
+
+static void *
+nop_get_pointer(struct gl_context *ctx, struct gl_renderbuffer *rb, GLint x, GLint y)
+{
+   (void) ctx;
+   (void) rb;
+   (void) x;
+   (void) y;
+   return NULL;
+}
+
+
+/**
+ * Delete a depth or stencil wrapper renderbuffer.
+ */
+static void
+delete_wrapper(struct gl_renderbuffer *rb)
+{
+   ASSERT(rb->Format == MESA_FORMAT_S8 ||
+          rb->Format == MESA_FORMAT_X8_Z24 ||
+          rb->Format == MESA_FORMAT_Z32_FLOAT);
+   _mesa_reference_renderbuffer(&rb->Wrapped, NULL);
+   free(rb);
+}
+
+
+/**
+ * Realloc storage for wrapper.
+ */
+static GLboolean
+alloc_wrapper_storage(struct gl_context *ctx, struct gl_renderbuffer *rb,
+                      GLenum internalFormat, GLuint width, GLuint height)
+{
+   /* just pass this on to the wrapped renderbuffer */
+   struct gl_renderbuffer *dsrb = rb->Wrapped;
+   GLboolean retVal;
+
+   (void) internalFormat;
+
+   ASSERT(dsrb->Format == MESA_FORMAT_Z24_S8 ||
+          dsrb->Format == MESA_FORMAT_Z24_X8 ||
+          dsrb->Format == MESA_FORMAT_S8_Z24 ||
+          dsrb->Format == MESA_FORMAT_X8_Z24);
+
+   retVal = dsrb->AllocStorage(ctx, dsrb, dsrb->InternalFormat, width, height);
+   if (retVal) {
+      rb->Width = width;
+      rb->Height = height;
+      rb->RowStride = dsrb->RowStride;
+   }
+   return retVal;
+}
+
+
+
+
+/*======================================================================
+ * Depth wrapper around depth/stencil renderbuffer
+ */
+
+static void
+get_row_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+            GLint x, GLint y, void *values)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   GLuint temp[MAX_WIDTH], i;
+   GLuint *dst = (GLuint *) values;
+   const GLuint *src = (const GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (!src) {
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      src = temp;
+   }
+   if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+      for (i = 0; i < count; i++) {
+         dst[i] = src[i] >> 8;
+      }
+   }
+   else {
+      assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+      for (i = 0; i < count; i++) {
+         dst[i] = src[i] & 0xffffff;
+      }
+   }
+}
+
+static void
+get_values_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+               const GLint x[], const GLint y[], void *values)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   GLuint temp[MAX_WIDTH], i;
+   GLuint *dst = (GLuint *) values;
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   ASSERT(count <= MAX_WIDTH);
+   /* don't bother trying direct access */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+      for (i = 0; i < count; i++) {
+         dst[i] = temp[i] >> 8;
+      }
+   }
+   else {
+      assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+      for (i = 0; i < count; i++) {
+         dst[i] = temp[i] & 0xffffff;
+      }
+   }
+}
+
+static void
+put_row_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+            GLint x, GLint y, const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   const GLuint *src = (const GLuint *) values;
+   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i] = (src[i] << 8) | (dst[i] & 0xff);
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i] = (src[i] & 0xffffff) | (dst[i] & 0xff000000);
+            }
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH], i;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (src[i] << 8) | (temp[i] & 0xff);
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (src[i] & 0xffffff) | (temp[i] & 0xff000000);
+            }
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_row_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+                 GLint x, GLint y, const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         const GLuint shiftedVal = *((GLuint *) value) << 8;
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i] = shiftedVal | (dst[i] & 0xff);
+            }
+         }
+      }
+      else {
+         const GLuint shiftedVal = *((GLuint *) value);
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i] = shiftedVal | (dst[i] & 0xff000000);
+            }
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH], i;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         const GLuint shiftedVal = *((GLuint *) value) << 8;
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = shiftedVal | (temp[i] & 0xff);
+            }
+         }
+      }
+      else {
+         const GLuint shiftedVal = *((GLuint *) value);
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = shiftedVal | (temp[i] & 0xff000000);
+            }
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_values_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb, GLuint count,
+               const GLint x[], const GLint y[],
+               const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   const GLuint *src = (const GLuint *) values;
+   ASSERT(z24rb->DataType == GL_UNSIGNED_INT);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   if (dsrb->GetPointer(ctx, dsrb, 0, 0)) {
+      /* direct access */
+      GLuint i;
+      if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);
+               *dst = (src[i] << 8) | (*dst & 0xff);
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);
+               *dst = (src[i] & 0xffffff) | (*dst & 0xff000000);
+            }
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH], i;
+      dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+      if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (src[i] << 8) | (temp[i] & 0xff);
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (src[i] & 0xffffff) | (temp[i] & 0xff000000);
+            }
+         }
+      }
+      dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_values_z24(struct gl_context *ctx, struct gl_renderbuffer *z24rb,
+                    GLuint count, const GLint x[], const GLint y[],
+                    const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z24rb->Wrapped;
+   GLuint temp[MAX_WIDTH], i;
+   /* get, modify, put */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+      const GLuint shiftedVal = *((GLuint *) value) << 8;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = shiftedVal | (temp[i] & 0xff);
+         }
+      }
+   }
+   else {
+      const GLuint shiftedVal = *((GLuint *) value);
+      assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = shiftedVal | (temp[i] & 0xff000000);
+         }
+      }
+   }
+   dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+}
+
+
+/**
+ * Wrap the given GL_DEPTH_STENCIL renderbuffer so that it acts like
+ * a depth renderbuffer.
+ * \return new depth renderbuffer
+ */
+struct gl_renderbuffer *
+_mesa_new_z24_renderbuffer_wrapper(struct gl_context *ctx,
+                                   struct gl_renderbuffer *dsrb)
+{
+   struct gl_renderbuffer *z24rb;
+
+   ASSERT(dsrb->Format == MESA_FORMAT_Z24_S8 ||
+          dsrb->Format == MESA_FORMAT_Z24_X8 ||
+          dsrb->Format == MESA_FORMAT_S8_Z24 ||
+          dsrb->Format == MESA_FORMAT_X8_Z24);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+
+   z24rb = ctx->Driver.NewRenderbuffer(ctx, 0);
+   if (!z24rb)
+      return NULL;
+
+   /* NOTE: need to do manual refcounting here */
+   z24rb->Wrapped = dsrb;
+   dsrb->RefCount++;
+
+   z24rb->Name = dsrb->Name;
+   z24rb->RefCount = 0;
+   z24rb->Width = dsrb->Width;
+   z24rb->Height = dsrb->Height;
+   z24rb->RowStride = dsrb->RowStride;
+   z24rb->InternalFormat = GL_DEPTH_COMPONENT24;
+   z24rb->Format = MESA_FORMAT_X8_Z24;
+   z24rb->_BaseFormat = GL_DEPTH_COMPONENT;
+   z24rb->DataType = GL_UNSIGNED_INT;
+   z24rb->Data = NULL;
+   z24rb->Delete = delete_wrapper;
+   z24rb->AllocStorage = alloc_wrapper_storage;
+   z24rb->GetPointer = nop_get_pointer;
+   z24rb->GetRow = get_row_z24;
+   z24rb->GetValues = get_values_z24;
+   z24rb->PutRow = put_row_z24;
+   z24rb->PutRowRGB = NULL;
+   z24rb->PutMonoRow = put_mono_row_z24;
+   z24rb->PutValues = put_values_z24;
+   z24rb->PutMonoValues = put_mono_values_z24;
+
+   return z24rb;
+}
+
+
+static void
+get_row_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,
+             GLint x, GLint y, void *values)
+{
+   struct gl_renderbuffer *dsrb = z32frb->Wrapped;
+   GLfloat temp[MAX_WIDTH*2];
+   GLfloat *dst = (GLfloat *) values;
+   const GLfloat *src = (const GLfloat *) dsrb->GetPointer(ctx, dsrb, x, y);
+   GLuint i;
+   ASSERT(z32frb->DataType == GL_FLOAT);
+   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);
+   if (!src) {
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      src = temp;
+   }
+   for (i = 0; i < count; i++) {
+      dst[i] = src[i*2];
+   }
+}
+
+static void
+get_values_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,
+                const GLint x[], const GLint y[], void *values)
+{
+   struct gl_renderbuffer *dsrb = z32frb->Wrapped;
+   GLfloat temp[MAX_WIDTH*2];
+   GLfloat *dst = (GLfloat *) values;
+   GLuint i;
+   ASSERT(z32frb->DataType == GL_FLOAT);
+   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);
+   ASSERT(count <= MAX_WIDTH);
+   /* don't bother trying direct access */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   for (i = 0; i < count; i++) {
+      dst[i] = temp[i*2];
+   }
+}
+
+static void
+put_row_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,
+             GLint x, GLint y, const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z32frb->Wrapped;
+   const GLfloat *src = (const GLfloat *) values;
+   GLfloat *dst = (GLfloat *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(z32frb->DataType == GL_FLOAT);
+   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            dst[i*2] = src[i];
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLfloat temp[MAX_WIDTH*2];
+      GLuint i;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i*2] = src[i];
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_row_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,
+                  GLint x, GLint y, const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z32frb->Wrapped;
+   GLfloat *dst = (GLfloat *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(z32frb->DataType == GL_FLOAT);
+   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      const GLfloat val = *(GLfloat*)value;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            dst[i*2] = val;
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLfloat temp[MAX_WIDTH*2];
+      GLuint i;
+      const GLfloat val = *(GLfloat *)value;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i*2] = val;
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_values_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb, GLuint count,
+                const GLint x[], const GLint y[],
+                const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z32frb->Wrapped;
+   const GLfloat *src = (const GLfloat *) values;
+   ASSERT(z32frb->DataType == GL_FLOAT);
+   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);
+   if (dsrb->GetPointer(ctx, dsrb, 0, 0)) {
+      /* direct access */
+      GLuint i;
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            GLfloat *dst = (GLfloat *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);
+            *dst = src[i];
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLfloat temp[MAX_WIDTH*2];
+      GLuint i;
+      dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i*2] = src[i];
+         }
+      }
+      dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_values_z32f(struct gl_context *ctx, struct gl_renderbuffer *z32frb,
+                     GLuint count, const GLint x[], const GLint y[],
+                     const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = z32frb->Wrapped;
+   GLfloat temp[MAX_WIDTH*2];
+   GLuint i;
+   const GLfloat val = *(GLfloat *)value;
+   ASSERT(z32frb->DataType == GL_FLOAT);
+   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);
+   /* get, modify, put */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   for (i = 0; i < count; i++) {
+      if (!mask || mask[i]) {
+         temp[i*2] = val;
+      }
+   }
+   dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+}
+
+
+/**
+ * Wrap the given GL_DEPTH_STENCIL renderbuffer so that it acts like
+ * a depth renderbuffer.
+ * \return new depth renderbuffer
+ */
+struct gl_renderbuffer *
+_mesa_new_z32f_renderbuffer_wrapper(struct gl_context *ctx,
+                                    struct gl_renderbuffer *dsrb)
+{
+   struct gl_renderbuffer *z32frb;
+
+   ASSERT(dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);
+   ASSERT(dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+
+   z32frb = ctx->Driver.NewRenderbuffer(ctx, 0);
+   if (!z32frb)
+      return NULL;
+
+   /* NOTE: need to do manual refcounting here */
+   z32frb->Wrapped = dsrb;
+   dsrb->RefCount++;
+
+   z32frb->Name = dsrb->Name;
+   z32frb->RefCount = 0;
+   z32frb->Width = dsrb->Width;
+   z32frb->Height = dsrb->Height;
+   z32frb->RowStride = dsrb->RowStride;
+   z32frb->InternalFormat = GL_DEPTH_COMPONENT32F;
+   z32frb->Format = MESA_FORMAT_Z32_FLOAT;
+   z32frb->_BaseFormat = GL_DEPTH_COMPONENT;
+   z32frb->DataType = GL_FLOAT;
+   z32frb->Data = NULL;
+   z32frb->Delete = delete_wrapper;
+   z32frb->AllocStorage = alloc_wrapper_storage;
+   z32frb->GetPointer = nop_get_pointer;
+   z32frb->GetRow = get_row_z32f;
+   z32frb->GetValues = get_values_z32f;
+   z32frb->PutRow = put_row_z32f;
+   z32frb->PutRowRGB = NULL;
+   z32frb->PutMonoRow = put_mono_row_z32f;
+   z32frb->PutValues = put_values_z32f;
+   z32frb->PutMonoValues = put_mono_values_z32f;
+
+   return z32frb;
+}
+
+
+/*======================================================================
+ * Stencil wrapper around depth/stencil renderbuffer
+ */
+
+static void
+get_row_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+           GLint x, GLint y, void *values)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   GLuint temp[MAX_WIDTH*2], i;
+   GLubyte *dst = (GLubyte *) values;
+   const GLuint *src = (const GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||
+          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   if (!src) {
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      src = temp;
+   }
+   if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
+      for (i = 0; i < count; i++) {
+         dst[i] = src[i*2+1] & 0xff;
+      }
+   }
+   else if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+      for (i = 0; i < count; i++) {
+         dst[i] = src[i] & 0xff;
+      }
+   }
+   else {
+      assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+      for (i = 0; i < count; i++) {
+         dst[i] = src[i] >> 24;
+      }
+   }
+}
+
+static void
+get_values_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+              const GLint x[], const GLint y[], void *values)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   GLuint temp[MAX_WIDTH*2], i;
+   GLubyte *dst = (GLubyte *) values;
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||
+          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   ASSERT(count <= MAX_WIDTH);
+   /* don't bother trying direct access */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
+      for (i = 0; i < count; i++) {
+         dst[i] = temp[i*2+1] & 0xff;
+      }
+   }
+   else if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+      for (i = 0; i < count; i++) {
+         dst[i] = temp[i] & 0xff;
+      }
+   }
+   else {
+      assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+      for (i = 0; i < count; i++) {
+         dst[i] = temp[i] >> 24;
+      }
+   }
+}
+
+static void
+put_row_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+           GLint x, GLint y, const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   const GLubyte *src = (const GLubyte *) values;
+   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||
+          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i*2+1] = src[i];
+            }
+         }
+      }
+      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i] = (dst[i] & 0xffffff00) | src[i];
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i] = (dst[i] & 0xffffff) | (src[i] << 24);
+            }
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH*2], i;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i*2+1] = src[i];
+            }
+         }
+      }
+      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (temp[i] & 0xffffff00) | src[i];
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (temp[i] & 0xffffff) | (src[i] << 24);
+            }
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_row_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+                GLint x, GLint y, const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   const GLubyte val = *((GLubyte *) value);
+   GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x, y);
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||
+          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   if (dst) {
+      /* direct access */
+      GLuint i;
+      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i*2+1] = val;
+            }
+         }
+      }
+      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i] = (dst[i] & 0xffffff00) | val;
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               dst[i] = (dst[i] & 0xffffff) | (val << 24);
+            }
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH*2], i;
+      dsrb->GetRow(ctx, dsrb, count, x, y, temp);
+      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i*2+1] = val;
+            }
+         }
+      }
+      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (temp[i] & 0xffffff00) | val;
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (temp[i] & 0xffffff) | (val << 24);
+            }
+         }
+      }
+      dsrb->PutRow(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_values_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+              const GLint x[], const GLint y[],
+              const void *values, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   const GLubyte *src = (const GLubyte *) values;
+   ASSERT(s8rb->DataType == GL_UNSIGNED_BYTE);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||
+          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+   if (dsrb->GetPointer(ctx, dsrb, 0, 0)) {
+      /* direct access */
+      GLuint i;
+      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);
+               dst[1] = src[i];
+            }
+         }
+      }
+      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);
+               *dst = (*dst & 0xffffff00) | src[i];
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               GLuint *dst = (GLuint *) dsrb->GetPointer(ctx, dsrb, x[i], y[i]);
+               *dst = (*dst & 0xffffff) | (src[i] << 24);
+            }
+         }
+      }
+   }
+   else {
+      /* get, modify, put */
+      GLuint temp[MAX_WIDTH*2], i;
+      dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+      if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i*2+1] = src[i];
+            }
+         }
+      }
+      else if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (temp[i] & 0xffffff00) | src[i];
+            }
+         }
+      }
+      else {
+         assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+         for (i = 0; i < count; i++) {
+            if (!mask || mask[i]) {
+               temp[i] = (temp[i] & 0xffffff) | (src[i] << 24);
+            }
+         }
+      }
+      dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+   }
+}
+
+static void
+put_mono_values_s8(struct gl_context *ctx, struct gl_renderbuffer *s8rb, GLuint count,
+                   const GLint x[], const GLint y[],
+                   const void *value, const GLubyte *mask)
+{
+   struct gl_renderbuffer *dsrb = s8rb->Wrapped;
+   GLuint temp[MAX_WIDTH*2], i;
+   const GLubyte val = *((GLubyte *) value);
+   /* get, modify, put */
+   dsrb->GetValues(ctx, dsrb, count, x, y, temp);
+   if (dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8) {
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i*2+1] = val;
+         }
+      }
+   }
+   else if (dsrb->Format == MESA_FORMAT_Z24_S8) {
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = (temp[i] & 0xffffff00) | val;
+         }
+      }
+   }
+   else {
+      assert(dsrb->Format == MESA_FORMAT_S8_Z24);
+      for (i = 0; i < count; i++) {
+         if (!mask || mask[i]) {
+            temp[i] = (temp[i] & 0xffffff) | (val << 24);
+         }
+      }
+   }
+   dsrb->PutValues(ctx, dsrb, count, x, y, temp, mask);
+}
+
+
+/**
+ * Wrap the given GL_DEPTH_STENCIL renderbuffer so that it acts like
+ * a stencil renderbuffer.
+ * \return new stencil renderbuffer
+ */
+struct gl_renderbuffer *
+_mesa_new_s8_renderbuffer_wrapper(struct gl_context *ctx, struct gl_renderbuffer *dsrb)
+{
+   struct gl_renderbuffer *s8rb;
+
+   ASSERT(dsrb->Format == MESA_FORMAT_Z24_S8 ||
+          dsrb->Format == MESA_FORMAT_S8_Z24 ||
+          dsrb->Format == MESA_FORMAT_Z32_FLOAT_X24S8);
+   ASSERT(dsrb->DataType == GL_UNSIGNED_INT_24_8_EXT ||
+          dsrb->DataType == GL_FLOAT_32_UNSIGNED_INT_24_8_REV);
+
+   s8rb = ctx->Driver.NewRenderbuffer(ctx, 0);
+   if (!s8rb)
+      return NULL;
+
+   /* NOTE: need to do manual refcounting here */
+   s8rb->Wrapped = dsrb;
+   dsrb->RefCount++;
+
+   s8rb->Name = dsrb->Name;
+   s8rb->RefCount = 0;
+   s8rb->Width = dsrb->Width;
+   s8rb->Height = dsrb->Height;
+   s8rb->RowStride = dsrb->RowStride;
+   s8rb->InternalFormat = GL_STENCIL_INDEX8_EXT;
+   s8rb->Format = MESA_FORMAT_S8;
+   s8rb->_BaseFormat = GL_STENCIL_INDEX;
+   s8rb->DataType = GL_UNSIGNED_BYTE;
+   s8rb->Data = NULL;
+   s8rb->Delete = delete_wrapper;
+   s8rb->AllocStorage = alloc_wrapper_storage;
+   s8rb->GetPointer = nop_get_pointer;
+   s8rb->GetRow = get_row_s8;
+   s8rb->GetValues = get_values_s8;
+   s8rb->PutRow = put_row_s8;
+   s8rb->PutRowRGB = NULL;
+   s8rb->PutMonoRow = put_mono_row_s8;
+   s8rb->PutValues = put_values_s8;
+   s8rb->PutMonoValues = put_mono_values_s8;
+
+   return s8rb;
+}
+
+
+
+/**
+ ** The following functions are useful for hardware drivers that only
+ ** implement combined depth/stencil buffers.
+ ** The GL_EXT_framebuffer_object extension allows indepedent depth and
+ ** stencil buffers to be used in any combination.
+ ** Therefore, we sometimes have to merge separate depth and stencil
+ ** renderbuffers into a single depth+stencil renderbuffer.  And sometimes
+ ** we have to split combined depth+stencil renderbuffers into separate
+ ** renderbuffers.
+ **/
+
+
+/**
+ * Extract stencil values from the combined depth/stencil renderbuffer, storing
+ * the values into a separate stencil renderbuffer.
+ * \param dsRb  the source depth/stencil renderbuffer
+ * \param stencilRb  the destination stencil renderbuffer
+ *                   (either 8-bit or 32-bit)
+ */
+void
+_mesa_extract_stencil(struct gl_context *ctx,
+                      struct gl_renderbuffer *dsRb,
+                      struct gl_renderbuffer *stencilRb)
+{
+   GLuint row, width, height;
+
+   ASSERT(dsRb);
+   ASSERT(stencilRb);
+
+   ASSERT(dsRb->Format == MESA_FORMAT_Z24_S8);
+   ASSERT(dsRb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   ASSERT(stencilRb->Format == MESA_FORMAT_Z24_S8 ||
+          stencilRb->Format == MESA_FORMAT_S8);
+   ASSERT(dsRb->Width == stencilRb->Width);
+   ASSERT(dsRb->Height == stencilRb->Height);
+
+   width = dsRb->Width;
+   height = dsRb->Height;
+
+   for (row = 0; row < height; row++) {
+      GLuint depthStencil[MAX_WIDTH];
+      dsRb->GetRow(ctx, dsRb, width, 0, row, depthStencil);
+      if (stencilRb->Format == MESA_FORMAT_S8) {
+         /* 8bpp stencil */
+         GLubyte stencil[MAX_WIDTH];
+         GLuint i;
+         for (i = 0; i < width; i++) {
+            stencil[i] = depthStencil[i] & 0xff;
+         }
+         stencilRb->PutRow(ctx, stencilRb, width, 0, row, stencil, NULL);
+      }
+      else {
+         /* 32bpp stencil */
+         /* the 24 depth bits will be ignored */
+         ASSERT(stencilRb->Format == MESA_FORMAT_Z24_S8);
+         ASSERT(stencilRb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+         stencilRb->PutRow(ctx, stencilRb, width, 0, row, depthStencil, NULL);
+      }
+   }
+}
+
+
+/**
+ * Copy stencil values from a stencil renderbuffer into a combined
+ * depth/stencil renderbuffer.
+ * \param dsRb  the destination depth/stencil renderbuffer
+ * \param stencilRb  the source stencil buffer (either 8-bit or 32-bit)
+ */
+void
+_mesa_insert_stencil(struct gl_context *ctx,
+                     struct gl_renderbuffer *dsRb,
+                     struct gl_renderbuffer *stencilRb)
+{
+   GLuint row, width, height;
+
+   ASSERT(dsRb);
+   ASSERT(stencilRb);
+
+   ASSERT(dsRb->Format == MESA_FORMAT_Z24_S8);
+   ASSERT(dsRb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+   ASSERT(stencilRb->Format == MESA_FORMAT_Z24_S8 ||
+          stencilRb->Format == MESA_FORMAT_S8);
+
+   ASSERT(dsRb->Width == stencilRb->Width);
+   ASSERT(dsRb->Height == stencilRb->Height);
+
+   width = dsRb->Width;
+   height = dsRb->Height;
+
+   for (row = 0; row < height; row++) {
+      GLuint depthStencil[MAX_WIDTH];
+
+      dsRb->GetRow(ctx, dsRb, width, 0, row, depthStencil);
+
+      if (stencilRb->Format == MESA_FORMAT_S8) {
+         /* 8bpp stencil */
+         GLubyte stencil[MAX_WIDTH];
+         GLuint i;
+         stencilRb->GetRow(ctx, stencilRb, width, 0, row, stencil);
+         for (i = 0; i < width; i++) {
+            depthStencil[i] = (depthStencil[i] & 0xffffff00) | stencil[i];
+         }
+      }
+      else {
+         /* 32bpp stencil buffer */
+         GLuint stencil[MAX_WIDTH], i;
+         ASSERT(stencilRb->Format == MESA_FORMAT_Z24_S8);
+         ASSERT(stencilRb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+         stencilRb->GetRow(ctx, stencilRb, width, 0, row, stencil);
+         for (i = 0; i < width; i++) {
+            depthStencil[i]
+               = (depthStencil[i] & 0xffffff00) | (stencil[i] & 0xff);
+         }
+      }
+
+      dsRb->PutRow(ctx, dsRb, width, 0, row, depthStencil, NULL);
+   }
+}
+
+
+/**
+ * Convert the stencil buffer from 8bpp to 32bpp depth/stencil.
+ * \param stencilRb  the stencil renderbuffer to promote
+ */
+void
+_mesa_promote_stencil(struct gl_context *ctx, struct gl_renderbuffer *stencilRb)
+{
+   const GLsizei width = stencilRb->Width;
+   const GLsizei height = stencilRb->Height;
+   GLubyte *data;
+   GLint i, j, k;
+
+   ASSERT(stencilRb->Format == MESA_FORMAT_S8);
+   ASSERT(stencilRb->Data);
+
+   data = (GLubyte *) stencilRb->Data;
+   stencilRb->Data = NULL;
+   stencilRb->AllocStorage(ctx, stencilRb, GL_DEPTH24_STENCIL8_EXT,
+                           width, height);
+
+   ASSERT(stencilRb->DataType == GL_UNSIGNED_INT_24_8_EXT);
+
+   k = 0;
+   for (i = 0; i < height; i++) {
+      GLuint depthStencil[MAX_WIDTH];
+      for (j = 0; j < width; j++) {
+         depthStencil[j] = data[k++];
+      }
+      stencilRb->PutRow(ctx, stencilRb, width, 0, i, depthStencil, NULL);
+   }
+   free(data);
+}