svn merge ^/branches/released . --username marha

1 files changed, 344 insertions, 0 deletions

diff --git a/mesalib/src/mesa/swrast/s_clear.c b/mesalib/src/mesa/swrast/s_clear.c
new file mode 100644
index 000000000..35080fd39
--- /dev/null
+++ b/mesalib/src/mesa/swrast/s_clear.c
@@ -0,0 +1,344 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.1
+ *
+ * Copyright (C) 1999-2008  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 "main/glheader.h"
+#include "main/colormac.h"
+#include "main/macros.h"
+#include "main/imports.h"
+#include "main/mtypes.h"
+
+#include "s_accum.h"
+#include "s_context.h"
+#include "s_depth.h"
+#include "s_masking.h"
+#include "s_stencil.h"
+
+
+/**
+ * Clear the color buffer when glColorMask is in effect.
+ */
+static void
+clear_rgba_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   const GLint x = ctx->DrawBuffer->_Xmin;
+   const GLint y = ctx->DrawBuffer->_Ymin;
+   const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
+   const GLint width  = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
+   SWspan span;
+   GLint i;
+
+   ASSERT(ctx->Visual.rgbMode);
+   ASSERT(rb->PutRow);
+
+   /* Initialize color span with clear color */
+   /* XXX optimize for clearcolor == black/zero (bzero) */
+   INIT_SPAN(span, GL_BITMAP);
+   span.end = width;
+   span.arrayMask = SPAN_RGBA;
+   span.array->ChanType = rb->DataType;
+   if (span.array->ChanType == GL_UNSIGNED_BYTE) {
+      GLubyte clearColor[4];
+      UNCLAMPED_FLOAT_TO_UBYTE(clearColor[RCOMP], ctx->Color.ClearColor[0]);
+      UNCLAMPED_FLOAT_TO_UBYTE(clearColor[GCOMP], ctx->Color.ClearColor[1]);
+      UNCLAMPED_FLOAT_TO_UBYTE(clearColor[BCOMP], ctx->Color.ClearColor[2]);
+      UNCLAMPED_FLOAT_TO_UBYTE(clearColor[ACOMP], ctx->Color.ClearColor[3]);
+      for (i = 0; i < width; i++) {
+         COPY_4UBV(span.array->rgba[i], clearColor);
+      }
+   }
+   else if (span.array->ChanType == GL_UNSIGNED_SHORT) {
+      GLushort clearColor[4];
+      UNCLAMPED_FLOAT_TO_USHORT(clearColor[RCOMP], ctx->Color.ClearColor[0]);
+      UNCLAMPED_FLOAT_TO_USHORT(clearColor[GCOMP], ctx->Color.ClearColor[1]);
+      UNCLAMPED_FLOAT_TO_USHORT(clearColor[BCOMP], ctx->Color.ClearColor[2]);
+      UNCLAMPED_FLOAT_TO_USHORT(clearColor[ACOMP], ctx->Color.ClearColor[3]);
+      for (i = 0; i < width; i++) {
+         COPY_4V(span.array->rgba[i], clearColor);
+      }
+   }
+   else {
+      ASSERT(span.array->ChanType == GL_FLOAT);
+      for (i = 0; i < width; i++) {
+         CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][0], ctx->Color.ClearColor[0]);
+         CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][1], ctx->Color.ClearColor[1]);
+         CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][2], ctx->Color.ClearColor[2]);
+         CLAMPED_FLOAT_TO_CHAN(span.array->rgba[i][3], ctx->Color.ClearColor[3]);
+      }
+   }
+
+   /* Note that masking will change the color values, but only the
+    * channels for which the write mask is GL_FALSE.  The channels
+    * which which are write-enabled won't get modified.
+    */
+   for (i = 0; i < height; i++) {
+      span.x = x;
+      span.y = y + i;
+      _swrast_mask_rgba_span(ctx, rb, &span);
+      /* write masked row */
+      rb->PutRow(ctx, rb, width, x, y + i, span.array->rgba, NULL);
+   }
+}
+
+
+/**
+ * Clear color index buffer with masking.
+ */
+static void
+clear_ci_buffer_with_masking(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   const GLint x = ctx->DrawBuffer->_Xmin;
+   const GLint y = ctx->DrawBuffer->_Ymin;
+   const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
+   const GLint width  = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
+   SWspan span;
+   GLint i;
+
+   ASSERT(!ctx->Visual.rgbMode);
+   ASSERT(rb->PutRow);
+   ASSERT(rb->DataType == GL_UNSIGNED_INT);
+
+   /* Initialize index span with clear index */
+   INIT_SPAN(span, GL_BITMAP);
+   span.end = width;
+   span.arrayMask = SPAN_INDEX;
+   for (i = 0; i < width;i++) {
+      span.array->index[i] = ctx->Color.ClearIndex;
+   }
+
+   /* Note that masking will change the color indexes, but only the
+    * bits for which the write mask is GL_FALSE.  The bits
+    * which are write-enabled won't get modified.
+    */
+   for (i = 0; i < height;i++) {
+      span.x = x;
+      span.y = y + i;
+      _swrast_mask_ci_span(ctx, rb, &span);
+      /* write masked row */
+      rb->PutRow(ctx, rb, width, x, y + i, span.array->index, NULL);
+   }
+}
+
+
+/**
+ * Clear an rgba color buffer without channel masking.
+ */
+static void
+clear_rgba_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   const GLint x = ctx->DrawBuffer->_Xmin;
+   const GLint y = ctx->DrawBuffer->_Ymin;
+   const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
+   const GLint width  = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
+   GLubyte clear8[4];
+   GLushort clear16[4];
+   GLvoid *clearVal;
+   GLint i;
+
+   ASSERT(ctx->Visual.rgbMode);
+
+   ASSERT(ctx->Color.ColorMask[0] &&
+          ctx->Color.ColorMask[1] &&
+          ctx->Color.ColorMask[2] &&
+          ctx->Color.ColorMask[3]);             
+
+   ASSERT(rb->PutMonoRow);
+
+   switch (rb->DataType) {
+      case GL_UNSIGNED_BYTE:
+         UNCLAMPED_FLOAT_TO_UBYTE(clear8[0], ctx->Color.ClearColor[0]);
+         UNCLAMPED_FLOAT_TO_UBYTE(clear8[1], ctx->Color.ClearColor[1]);
+         UNCLAMPED_FLOAT_TO_UBYTE(clear8[2], ctx->Color.ClearColor[2]);
+         UNCLAMPED_FLOAT_TO_UBYTE(clear8[3], ctx->Color.ClearColor[3]);
+         clearVal = clear8;
+         break;
+      case GL_UNSIGNED_SHORT:
+         UNCLAMPED_FLOAT_TO_USHORT(clear16[0], ctx->Color.ClearColor[0]);
+         UNCLAMPED_FLOAT_TO_USHORT(clear16[1], ctx->Color.ClearColor[1]);
+         UNCLAMPED_FLOAT_TO_USHORT(clear16[2], ctx->Color.ClearColor[2]);
+         UNCLAMPED_FLOAT_TO_USHORT(clear16[3], ctx->Color.ClearColor[3]);
+         clearVal = clear16;
+         break;
+      case GL_FLOAT:
+         clearVal = ctx->Color.ClearColor;
+         break;
+      default:
+         _mesa_problem(ctx, "Bad rb DataType in clear_color_buffer");
+         return;
+   }
+
+   for (i = 0; i < height; i++) {
+      rb->PutMonoRow(ctx, rb, width, x, y + i, clearVal, NULL);
+   }
+}
+
+
+/**
+ * Clear color index buffer without masking.
+ */
+static void
+clear_ci_buffer(GLcontext *ctx, struct gl_renderbuffer *rb)
+{
+   const GLint x = ctx->DrawBuffer->_Xmin;
+   const GLint y = ctx->DrawBuffer->_Ymin;
+   const GLint height = ctx->DrawBuffer->_Ymax - ctx->DrawBuffer->_Ymin;
+   const GLint width  = ctx->DrawBuffer->_Xmax - ctx->DrawBuffer->_Xmin;
+   GLubyte clear8;
+   GLushort clear16;
+   GLuint clear32;
+   GLvoid *clearVal;
+   GLint i;
+
+   ASSERT(!ctx->Visual.rgbMode);
+
+   ASSERT((ctx->Color.IndexMask & ((1 << rb->IndexBits) - 1))
+          == (GLuint) ((1 << rb->IndexBits) - 1));
+
+   ASSERT(rb->PutMonoRow);
+
+   /* setup clear value */
+   switch (rb->DataType) {
+      case GL_UNSIGNED_BYTE:
+         clear8 = (GLubyte) ctx->Color.ClearIndex;
+         clearVal = &clear8;
+         break;
+      case GL_UNSIGNED_SHORT:
+         clear16 = (GLushort) ctx->Color.ClearIndex;
+         clearVal = &clear16;
+         break;
+      case GL_UNSIGNED_INT:
+         clear32 = ctx->Color.ClearIndex;
+         clearVal = &clear32;
+         break;
+      default:
+         _mesa_problem(ctx, "Bad rb DataType in clear_color_buffer");
+         return;
+   }
+
+   for (i = 0; i < height; i++)
+      rb->PutMonoRow(ctx, rb, width, x, y + i, clearVal, NULL);
+}
+
+
+/**
+ * Clear the front/back/left/right/aux color buffers.
+ * This function is usually only called if the device driver can't
+ * clear its own color buffers for some reason (such as with masking).
+ */
+static void
+clear_color_buffers(GLcontext *ctx)
+{
+   GLboolean masking;
+   GLuint buf;
+
+   if (ctx->Visual.rgbMode) {
+      if (ctx->Color.ColorMask[0] && 
+          ctx->Color.ColorMask[1] && 
+          ctx->Color.ColorMask[2] && 
+          ctx->Color.ColorMask[3]) {
+         masking = GL_FALSE;
+      }
+      else {
+         masking = GL_TRUE;
+      }
+   }
+   else {
+      struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[0];
+      const GLuint indexBits = (1 << rb->IndexBits) - 1;
+      if ((ctx->Color.IndexMask & indexBits) == indexBits) {
+         masking = GL_FALSE;
+      }
+      else {
+         masking = GL_TRUE;
+      }
+   }
+
+   for (buf = 0; buf < ctx->DrawBuffer->_NumColorDrawBuffers; buf++) {
+      struct gl_renderbuffer *rb = ctx->DrawBuffer->_ColorDrawBuffers[buf];
+      if (ctx->Visual.rgbMode) {
+         if (masking) {
+            clear_rgba_buffer_with_masking(ctx, rb);
+         }
+         else {
+            clear_rgba_buffer(ctx, rb);
+         }
+      }
+      else {
+         if (masking) {
+            clear_ci_buffer_with_masking(ctx, rb);
+         }
+         else {
+            clear_ci_buffer(ctx, rb);
+         }
+      }
+   }
+}
+
+
+/**
+ * Called via the device driver's ctx->Driver.Clear() function if the
+ * device driver can't clear one or more of the buffers itself.
+ * \param buffers  bitfield of BUFFER_BIT_* values indicating which
+ *                 renderbuffers are to be cleared.
+ * \param all  if GL_TRUE, clear whole buffer, else clear specified region.
+ */
+void
+_swrast_Clear(GLcontext *ctx, GLbitfield buffers)
+{
+#ifdef DEBUG_FOO
+   {
+      const GLbitfield legalBits =
+         BUFFER_BIT_FRONT_LEFT |
+	 BUFFER_BIT_FRONT_RIGHT |
+	 BUFFER_BIT_BACK_LEFT |
+	 BUFFER_BIT_BACK_RIGHT |
+	 BUFFER_BIT_DEPTH |
+	 BUFFER_BIT_STENCIL |
+	 BUFFER_BIT_ACCUM |
+         BUFFER_BIT_AUX0;
+      assert((buffers & (~legalBits)) == 0);
+   }
+#endif
+
+   swrast_render_start(ctx);
+
+   /* do software clearing here */
+   if (buffers) {
+      if ((buffers & BUFFER_BITS_COLOR)
+          && (ctx->DrawBuffer->_NumColorDrawBuffers > 0)) {
+         clear_color_buffers(ctx);
+      }
+      if (buffers & BUFFER_BIT_DEPTH) {
+         _swrast_clear_depth_buffer(ctx, ctx->DrawBuffer->_DepthBuffer);
+      }
+      if (buffers & BUFFER_BIT_ACCUM) {
+         _swrast_clear_accum_buffer(ctx,
+                       ctx->DrawBuffer->Attachment[BUFFER_ACCUM].Renderbuffer);
+      }
+      if (buffers & BUFFER_BIT_STENCIL) {
+         _swrast_clear_stencil_buffer(ctx, ctx->DrawBuffer->_StencilBuffer);
+      }
+   }
+
+   swrast_render_finish(ctx);
+}