Added MesaLib-7.6

1 files changed, 932 insertions, 0 deletions

diff --git a/mesalib/src/mesa/swrast/s_copypix.c b/mesalib/src/mesa/swrast/s_copypix.c
new file mode 100644
index 000000000..5ecfb1e90
--- /dev/null
+++ b/mesalib/src/mesa/swrast/s_copypix.c
@@ -0,0 +1,932 @@
+/*
+ * Mesa 3-D graphics library
+ * Version:  7.1
+ *
+ * Copyright (C) 1999-2007  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/context.h"
+#include "main/colormac.h"
+#include "main/convolve.h"
+#include "main/histogram.h"
+#include "main/image.h"
+#include "main/macros.h"
+#include "main/imports.h"
+#include "main/pixel.h"
+
+#include "s_context.h"
+#include "s_depth.h"
+#include "s_span.h"
+#include "s_stencil.h"
+#include "s_zoom.h"
+
+
+
+/**
+ * Determine if there's overlap in an image copy.
+ * This test also compensates for the fact that copies are done from
+ * bottom to top and overlaps can sometimes be handled correctly
+ * without making a temporary image copy.
+ * \return GL_TRUE if the regions overlap, GL_FALSE otherwise.
+ */
+static GLboolean
+regions_overlap(GLint srcx, GLint srcy,
+                GLint dstx, GLint dsty,
+                GLint width, GLint height,
+                GLfloat zoomX, GLfloat zoomY)
+{
+   if (zoomX == 1.0 && zoomY == 1.0) {
+      /* no zoom */
+      if (srcx >= dstx + width || (srcx + width <= dstx)) {
+         return GL_FALSE;
+      }
+      else if (srcy < dsty) { /* this is OK */
+         return GL_FALSE;
+      }
+      else if (srcy > dsty + height) {
+         return GL_FALSE;
+      }
+      else {
+         return GL_TRUE;
+      }
+   }
+   else {
+      /* add one pixel of slop when zooming, just to be safe */
+      if (srcx > (dstx + ((zoomX > 0.0F) ? (width * zoomX + 1.0F) : 0.0F))) {
+         /* src is completely right of dest */
+         return GL_FALSE;
+      }
+      else if (srcx + width + 1.0F < dstx + ((zoomX > 0.0F) ? 0.0F : (width * zoomX))) {
+         /* src is completely left of dest */
+         return GL_FALSE;
+      }
+      else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
+         /* src is completely below dest */
+         return GL_FALSE;
+      }
+      else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
+         /* src is completely above dest */
+         return GL_FALSE;
+      }
+      else {
+         return GL_TRUE;
+      }
+   }
+}
+
+
+/**
+ * RGBA copypixels with convolution.
+ */
+static void
+copy_conv_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+                      GLint width, GLint height, GLint destx, GLint desty)
+{
+   GLint row;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   const GLbitfield transferOps = ctx->_ImageTransferState;
+   const GLboolean sink = (ctx->Pixel.MinMaxEnabled && ctx->MinMax.Sink)
+      || (ctx->Pixel.HistogramEnabled && ctx->Histogram.Sink);
+   GLfloat *dest, *tmpImage, *convImage;
+   SWspan span;
+
+   INIT_SPAN(span, GL_BITMAP);
+   _swrast_span_default_attribs(ctx, &span);
+   span.arrayMask = SPAN_RGBA;
+   span.arrayAttribs = FRAG_BIT_COL0;
+
+   /* allocate space for GLfloat image */
+   tmpImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
+   if (!tmpImage) {
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+      return;
+   }
+   convImage = (GLfloat *) _mesa_malloc(width * height * 4 * sizeof(GLfloat));
+   if (!convImage) {
+      _mesa_free(tmpImage);
+      _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+      return;
+   }
+
+   /* read source image as float/RGBA */
+   dest = tmpImage;
+   for (row = 0; row < height; row++) {
+      _swrast_read_rgba_span(ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                             width, srcx, srcy + row, GL_FLOAT, dest);
+      dest += 4 * width;
+   }
+
+   /* do the image transfer ops which preceed convolution */
+   for (row = 0; row < height; row++) {
+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) (tmpImage + row * width * 4);
+      _mesa_apply_rgba_transfer_ops(ctx,
+                                    transferOps & IMAGE_PRE_CONVOLUTION_BITS,
+                                    width, rgba);
+   }
+
+   /* do convolution */
+   if (ctx->Pixel.Convolution2DEnabled) {
+      _mesa_convolve_2d_image(ctx, &width, &height, tmpImage, convImage);
+   }
+   else {
+      ASSERT(ctx->Pixel.Separable2DEnabled);
+      _mesa_convolve_sep_image(ctx, &width, &height, tmpImage, convImage);
+   }
+   _mesa_free(tmpImage);
+
+   /* do remaining post-convolution image transfer ops */
+   for (row = 0; row < height; row++) {
+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) (convImage + row * width * 4);
+      _mesa_apply_rgba_transfer_ops(ctx,
+                                    transferOps & IMAGE_POST_CONVOLUTION_BITS,
+                                    width, rgba);
+   }
+
+   if (!sink) {
+      /* write the new image */
+      for (row = 0; row < height; row++) {
+         const GLfloat *src = convImage + row * width * 4;
+         GLfloat *rgba = (GLfloat *) span.array->attribs[FRAG_ATTRIB_COL0];
+
+         /* copy convolved colors into span array */
+         _mesa_memcpy(rgba, src, width * 4 * sizeof(GLfloat));
+
+         /* write span */
+         span.x = destx;
+         span.y = desty + row;
+         span.end = width;
+         span.array->ChanType = GL_FLOAT;
+         if (zoom) {
+            _swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
+         }
+         else {
+            _swrast_write_rgba_span(ctx, &span);
+         }
+      }
+      /* restore this */
+      span.array->ChanType = CHAN_TYPE;
+   }
+
+   _mesa_free(convImage);
+}
+
+
+/**
+ * RGBA copypixels
+ */
+static void
+copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+                 GLint width, GLint height, GLint destx, GLint desty)
+{
+   GLfloat *tmpImage, *p;
+   GLint sy, dy, stepy, row;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   GLint overlapping;
+   GLuint transferOps = ctx->_ImageTransferState;
+   SWspan span;
+
+   if (!ctx->ReadBuffer->_ColorReadBuffer) {
+      /* no readbuffer - OK */
+      return;
+   }
+
+   if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
+      copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
+      return;
+   }
+   else if (ctx->Pixel.Convolution1DEnabled) {
+      /* make sure we don't apply 1D convolution */
+      transferOps &= ~(IMAGE_CONVOLUTION_BIT |
+                       IMAGE_POST_CONVOLUTION_SCALE_BIAS);
+   }
+
+   if (ctx->DrawBuffer == ctx->ReadBuffer) {
+      overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+   }
+   else {
+      overlapping = GL_FALSE;
+   }
+
+   /* Determine if copy should be done bottom-to-top or top-to-bottom */
+   if (!overlapping && srcy < desty) {
+      /* top-down  max-to-min */
+      sy = srcy + height - 1;
+      dy = desty + height - 1;
+      stepy = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      sy = srcy;
+      dy = desty;
+      stepy = 1;
+   }
+
+   INIT_SPAN(span, GL_BITMAP);
+   _swrast_span_default_attribs(ctx, &span);
+   span.arrayMask = SPAN_RGBA;
+   span.arrayAttribs = FRAG_BIT_COL0; /* we'll fill in COL0 attrib values */
+
+   if (overlapping) {
+      tmpImage = (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat) * 4);
+      if (!tmpImage) {
+         _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      /* read the source image as RGBA/float */
+      p = tmpImage;
+      for (row = 0; row < height; row++) {
+         _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                                 width, srcx, sy + row, GL_FLOAT, p );
+         p += width * 4;
+      }
+      p = tmpImage;
+   }
+   else {
+      tmpImage = NULL;  /* silence compiler warnings */
+      p = NULL;
+   }
+
+   ASSERT(width < MAX_WIDTH);
+
+   for (row = 0; row < height; row++, sy += stepy, dy += stepy) {
+      GLvoid *rgba = span.array->attribs[FRAG_ATTRIB_COL0];
+
+      /* Get row/span of source pixels */
+      if (overlapping) {
+         /* get from buffered image */
+         _mesa_memcpy(rgba, p, width * sizeof(GLfloat) * 4);
+         p += width * 4;
+      }
+      else {
+         /* get from framebuffer */
+         _swrast_read_rgba_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                                 width, srcx, sy, GL_FLOAT, rgba );
+      }
+
+      if (transferOps) {
+         _mesa_apply_rgba_transfer_ops(ctx, transferOps, width,
+                                       (GLfloat (*)[4]) rgba);
+      }
+
+      /* Write color span */
+      span.x = destx;
+      span.y = dy;
+      span.end = width;
+      span.array->ChanType = GL_FLOAT;
+      if (zoom) {
+         _swrast_write_zoomed_rgba_span(ctx, destx, desty, &span, rgba);
+      }
+      else {
+         _swrast_write_rgba_span(ctx, &span);
+      }
+   }
+
+   span.array->ChanType = CHAN_TYPE; /* restore */
+
+   if (overlapping)
+      _mesa_free(tmpImage);
+}
+
+
+static void
+copy_ci_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+                GLint width, GLint height,
+                GLint destx, GLint desty )
+{
+   GLuint *tmpImage,*p;
+   GLint sy, dy, stepy;
+   GLint j;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   GLint overlapping;
+   SWspan span;
+
+   if (!ctx->ReadBuffer->_ColorReadBuffer) {
+      /* no readbuffer - OK */
+      return;
+   }
+
+   INIT_SPAN(span, GL_BITMAP);
+   _swrast_span_default_attribs(ctx, &span);
+   span.arrayMask = SPAN_INDEX;
+
+   if (ctx->DrawBuffer == ctx->ReadBuffer) {
+      overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+   }
+   else {
+      overlapping = GL_FALSE;
+   }
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (!overlapping && srcy < desty) {
+      /* top-down  max-to-min */
+      sy = srcy + height - 1;
+      dy = desty + height - 1;
+      stepy = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      sy = srcy;
+      dy = desty;
+      stepy = 1;
+   }
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLuint *) _mesa_malloc(width * height * sizeof(GLuint));
+      if (!tmpImage) {
+         _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      /* read the image */
+      p = tmpImage;
+      for (j = 0; j < height; j++, ssy += stepy) {
+         _swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                                  width, srcx, ssy, p );
+         p += width;
+      }
+      p = tmpImage;
+   }
+   else {
+      tmpImage = NULL;  /* silence compiler warning */
+      p = NULL;
+   }
+
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+      /* Get color indexes */
+      if (overlapping) {
+         _mesa_memcpy(span.array->index, p, width * sizeof(GLuint));
+         p += width;
+      }
+      else {
+         _swrast_read_index_span( ctx, ctx->ReadBuffer->_ColorReadBuffer,
+                                  width, srcx, sy, span.array->index );
+      }
+
+      if (ctx->_ImageTransferState)
+         _mesa_apply_ci_transfer_ops(ctx, ctx->_ImageTransferState,
+                                     width, span.array->index);
+
+      /* write color indexes */
+      span.x = destx;
+      span.y = dy;
+      span.end = width;
+      if (zoom)
+         _swrast_write_zoomed_index_span(ctx, destx, desty, &span);
+      else
+         _swrast_write_index_span(ctx, &span);
+   }
+
+   if (overlapping)
+      _mesa_free(tmpImage);
+}
+
+
+/**
+ * Convert floating point Z values to integer Z values with pixel transfer's
+ * Z scale and bias.
+ */
+static void
+scale_and_bias_z(GLcontext *ctx, GLuint width,
+                 const GLfloat depth[], GLuint z[])
+{
+   const GLuint depthMax = ctx->DrawBuffer->_DepthMax;
+   GLuint i;
+
+   if (depthMax <= 0xffffff &&
+       ctx->Pixel.DepthScale == 1.0 &&
+       ctx->Pixel.DepthBias == 0.0) {
+      /* no scale or bias and no clamping and no worry of overflow */
+      const GLfloat depthMaxF = ctx->DrawBuffer->_DepthMaxF;
+      for (i = 0; i < width; i++) {
+         z[i] = (GLuint) (depth[i] * depthMaxF);
+      }
+   }
+   else {
+      /* need to be careful with overflow */
+      const GLdouble depthMaxF = ctx->DrawBuffer->_DepthMaxF;
+      for (i = 0; i < width; i++) {
+         GLdouble d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
+         d = CLAMP(d, 0.0, 1.0) * depthMaxF;
+         if (d >= depthMaxF)
+            z[i] = depthMax;
+         else
+            z[i] = (GLuint) d;
+      }
+   }
+}
+
+
+
+/*
+ * TODO: Optimize!!!!
+ */
+static void
+copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+                   GLint width, GLint height,
+                   GLint destx, GLint desty )
+{
+   struct gl_framebuffer *fb = ctx->ReadBuffer;
+   struct gl_renderbuffer *readRb = fb->_DepthBuffer;
+   GLfloat *p, *tmpImage;
+   GLint sy, dy, stepy;
+   GLint j;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   GLint overlapping;
+   SWspan span;
+
+   if (!readRb) {
+      /* no readbuffer - OK */
+      return;
+   }
+
+   INIT_SPAN(span, GL_BITMAP);
+   _swrast_span_default_attribs(ctx, &span);
+   span.arrayMask = SPAN_Z;
+
+   if (ctx->DrawBuffer == ctx->ReadBuffer) {
+      overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+   }
+   else {
+      overlapping = GL_FALSE;
+   }
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (!overlapping && srcy < desty) {
+      /* top-down  max-to-min */
+      sy = srcy + height - 1;
+      dy = desty + height - 1;
+      stepy = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      sy = srcy;
+      dy = desty;
+      stepy = 1;
+   }
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat));
+      if (!tmpImage) {
+         _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      p = tmpImage;
+      for (j = 0; j < height; j++, ssy += stepy) {
+         _swrast_read_depth_span_float(ctx, readRb, width, srcx, ssy, p);
+         p += width;
+      }
+      p = tmpImage;
+   }
+   else {
+      tmpImage = NULL;  /* silence compiler warning */
+      p = NULL;
+   }
+
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+      GLfloat depth[MAX_WIDTH];
+      /* get depth values */
+      if (overlapping) {
+         _mesa_memcpy(depth, p, width * sizeof(GLfloat));
+         p += width;
+      }
+      else {
+         _swrast_read_depth_span_float(ctx, readRb, width, srcx, sy, depth);
+      }
+
+      /* apply scale and bias */
+      scale_and_bias_z(ctx, width, depth, span.array->z);
+
+      /* write depth values */
+      span.x = destx;
+      span.y = dy;
+      span.end = width;
+      if (fb->Visual.rgbMode) {
+         if (zoom)
+            _swrast_write_zoomed_depth_span(ctx, destx, desty, &span);
+         else
+            _swrast_write_rgba_span(ctx, &span);
+      }
+      else {
+         if (zoom)
+            _swrast_write_zoomed_depth_span(ctx, destx, desty, &span);
+         else
+            _swrast_write_index_span(ctx, &span);
+      }
+   }
+
+   if (overlapping)
+      _mesa_free(tmpImage);
+}
+
+
+
+static void
+copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+                     GLint width, GLint height,
+                     GLint destx, GLint desty )
+{
+   struct gl_framebuffer *fb = ctx->ReadBuffer;
+   struct gl_renderbuffer *rb = fb->_StencilBuffer;
+   GLint sy, dy, stepy;
+   GLint j;
+   GLstencil *p, *tmpImage;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   GLint overlapping;
+
+   if (!rb) {
+      /* no readbuffer - OK */
+      return;
+   }
+
+   if (ctx->DrawBuffer == ctx->ReadBuffer) {
+      overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+   }
+   else {
+      overlapping = GL_FALSE;
+   }
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (!overlapping && srcy < desty) {
+      /* top-down  max-to-min */
+      sy = srcy + height - 1;
+      dy = desty + height - 1;
+      stepy = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      sy = srcy;
+      dy = desty;
+      stepy = 1;
+   }
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLstencil *) _mesa_malloc(width * height * sizeof(GLstencil));
+      if (!tmpImage) {
+         _mesa_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      p = tmpImage;
+      for (j = 0; j < height; j++, ssy += stepy) {
+         _swrast_read_stencil_span( ctx, rb, width, srcx, ssy, p );
+         p += width;
+      }
+      p = tmpImage;
+   }
+   else {
+      tmpImage = NULL;  /* silence compiler warning */
+      p = NULL;
+   }
+
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+      GLstencil stencil[MAX_WIDTH];
+
+      /* Get stencil values */
+      if (overlapping) {
+         _mesa_memcpy(stencil, p, width * sizeof(GLstencil));
+         p += width;
+      }
+      else {
+         _swrast_read_stencil_span( ctx, rb, width, srcx, sy, stencil );
+      }
+
+      _mesa_apply_stencil_transfer_ops(ctx, width, stencil);
+
+      /* Write stencil values */
+      if (zoom) {
+         _swrast_write_zoomed_stencil_span(ctx, destx, desty, width,
+                                           destx, dy, stencil);
+      }
+      else {
+         _swrast_write_stencil_span( ctx, width, destx, dy, stencil );
+      }
+   }
+
+   if (overlapping)
+      _mesa_free(tmpImage);
+}
+
+
+/**
+ * This isn't terribly efficient.  If a driver really has combined
+ * depth/stencil buffers the driver should implement an optimized
+ * CopyPixels function.
+ */
+static void
+copy_depth_stencil_pixels(GLcontext *ctx,
+                          const GLint srcX, const GLint srcY,
+                          const GLint width, const GLint height,
+                          const GLint destX, const GLint destY)
+{
+   struct gl_renderbuffer *stencilReadRb, *depthReadRb, *depthDrawRb;
+   GLint sy, dy, stepy;
+   GLint j;
+   GLstencil *tempStencilImage = NULL, *stencilPtr = NULL;
+   GLfloat *tempDepthImage = NULL, *depthPtr = NULL;
+   const GLfloat depthScale = ctx->DrawBuffer->_DepthMaxF;
+   const GLuint stencilMask = ctx->Stencil.WriteMask[0];
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   const GLboolean scaleOrBias
+      = ctx->Pixel.DepthScale != 1.0 || ctx->Pixel.DepthBias != 0.0;
+   GLint overlapping;
+
+   depthDrawRb = ctx->DrawBuffer->_DepthBuffer;
+   depthReadRb = ctx->ReadBuffer->_DepthBuffer;
+   stencilReadRb = ctx->ReadBuffer->_StencilBuffer;
+
+   ASSERT(depthDrawRb);
+   ASSERT(depthReadRb);
+   ASSERT(stencilReadRb);
+
+   if (ctx->DrawBuffer == ctx->ReadBuffer) {
+      overlapping = regions_overlap(srcX, srcY, destX, destY, width, height,
+                                    ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+   }
+   else {
+      overlapping = GL_FALSE;
+   }
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (!overlapping && srcY < destY) {
+      /* top-down  max-to-min */
+      sy = srcY + height - 1;
+      dy = destY + height - 1;
+      stepy = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      sy = srcY;
+      dy = destY;
+      stepy = 1;
+   }
+
+   if (overlapping) {
+      GLint ssy = sy;
+
+      if (stencilMask != 0x0) {
+         tempStencilImage
+            = (GLstencil *) _mesa_malloc(width * height * sizeof(GLstencil));
+         if (!tempStencilImage) {
+            _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+            return;
+         }
+
+         /* get copy of stencil pixels */
+         stencilPtr = tempStencilImage;
+         for (j = 0; j < height; j++, ssy += stepy) {
+            _swrast_read_stencil_span(ctx, stencilReadRb,
+                                      width, srcX, ssy, stencilPtr);
+            stencilPtr += width;
+         }
+         stencilPtr = tempStencilImage;
+      }
+
+      if (ctx->Depth.Mask) {
+         tempDepthImage
+            = (GLfloat *) _mesa_malloc(width * height * sizeof(GLfloat));
+         if (!tempDepthImage) {
+            _mesa_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+            _mesa_free(tempStencilImage);
+            return;
+         }
+
+         /* get copy of depth pixels */
+         depthPtr = tempDepthImage;
+         for (j = 0; j < height; j++, ssy += stepy) {
+            _swrast_read_depth_span_float(ctx, depthReadRb,
+                                          width, srcX, ssy, depthPtr);
+            depthPtr += width;
+         }
+         depthPtr = tempDepthImage;
+      }
+   }
+
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+      if (stencilMask != 0x0) {
+         GLstencil stencil[MAX_WIDTH];
+
+         /* Get stencil values */
+         if (overlapping) {
+            _mesa_memcpy(stencil, stencilPtr, width * sizeof(GLstencil));
+            stencilPtr += width;
+         }
+         else {
+            _swrast_read_stencil_span(ctx, stencilReadRb,
+                                      width, srcX, sy, stencil);
+         }
+
+         _mesa_apply_stencil_transfer_ops(ctx, width, stencil);
+
+         /* Write values */
+         if (zoom) {
+            _swrast_write_zoomed_stencil_span(ctx, destX, destY, width,
+                                              destX, dy, stencil);
+         }
+         else {
+            _swrast_write_stencil_span( ctx, width, destX, dy, stencil );
+         }
+      }
+
+      if (ctx->Depth.Mask) {
+         GLfloat depth[MAX_WIDTH];
+         GLuint zVals32[MAX_WIDTH];
+         GLushort zVals16[MAX_WIDTH];
+         GLvoid *zVals;
+         GLuint zBytes;
+
+         /* get depth values */
+         if (overlapping) {
+            _mesa_memcpy(depth, depthPtr, width * sizeof(GLfloat));
+            depthPtr += width;
+         }
+         else {
+            _swrast_read_depth_span_float(ctx, depthReadRb,
+                                          width, srcX, sy, depth);
+         }
+
+         /* scale & bias */
+         if (scaleOrBias) {
+            _mesa_scale_and_bias_depth(ctx, width, depth);
+         }
+         /* convert to integer Z values */
+         if (depthDrawRb->DataType == GL_UNSIGNED_SHORT) {
+            GLint k;
+            for (k = 0; k < width; k++)
+               zVals16[k] = (GLushort) (depth[k] * depthScale);
+            zVals = zVals16;
+            zBytes = 2;
+         }
+         else {
+            GLint k;
+            for (k = 0; k < width; k++)
+               zVals32[k] = (GLuint) (depth[k] * depthScale);
+            zVals = zVals32;
+            zBytes = 4;
+         }
+
+         /* Write values */
+         if (zoom) {
+            _swrast_write_zoomed_z_span(ctx, destX, destY, width,
+                                        destX, dy, zVals);
+         }
+         else {
+            _swrast_put_row(ctx, depthDrawRb, width, destX, dy, zVals, zBytes);
+         }
+      }
+   }
+
+   if (tempStencilImage)
+      _mesa_free(tempStencilImage);
+
+   if (tempDepthImage)
+      _mesa_free(tempDepthImage);
+}
+
+
+
+/**
+ * Try to do a fast copy pixels.
+ */
+static GLboolean
+fast_copy_pixels(GLcontext *ctx,
+                 GLint srcX, GLint srcY, GLsizei width, GLsizei height,
+                 GLint dstX, GLint dstY, GLenum type)
+{
+   struct gl_framebuffer *srcFb = ctx->ReadBuffer;
+   struct gl_framebuffer *dstFb = ctx->DrawBuffer;
+   struct gl_renderbuffer *srcRb, *dstRb;
+   GLint row, yStep;
+
+   if (SWRAST_CONTEXT(ctx)->_RasterMask != 0x0 ||
+       ctx->Pixel.ZoomX != 1.0F ||
+       ctx->Pixel.ZoomY != 1.0F ||
+       ctx->_ImageTransferState) {
+      /* can't handle these */
+      return GL_FALSE;
+   }
+
+   if (type == GL_COLOR) {
+      if (dstFb->_NumColorDrawBuffers != 1)
+         return GL_FALSE;
+      srcRb = srcFb->_ColorReadBuffer;
+      dstRb = dstFb->_ColorDrawBuffers[0];
+   }
+   else if (type == GL_STENCIL) {
+      srcRb = srcFb->_StencilBuffer;
+      dstRb = dstFb->_StencilBuffer;
+   }
+   else if (type == GL_DEPTH) {
+      srcRb = srcFb->_DepthBuffer;
+      dstRb = dstFb->_DepthBuffer;
+   }
+   else {
+      ASSERT(type == GL_DEPTH_STENCIL_EXT);
+      /* XXX correct? */
+      srcRb = srcFb->Attachment[BUFFER_DEPTH].Renderbuffer;
+      dstRb = dstFb->Attachment[BUFFER_DEPTH].Renderbuffer;
+   }
+
+   /* src and dst renderbuffers must be same format and type */
+   if (!srcRb || !dstRb ||
+       srcRb->DataType != dstRb->DataType ||
+       srcRb->_BaseFormat != dstRb->_BaseFormat) {
+      return GL_FALSE;
+   }
+
+   /* clipping not supported */
+   if (srcX < 0 || srcX + width > (GLint) srcFb->Width ||
+       srcY < 0 || srcY + height > (GLint) srcFb->Height ||
+       dstX < dstFb->_Xmin || dstX + width > dstFb->_Xmax ||
+       dstY < dstFb->_Ymin || dstY + height > dstFb->_Ymax) {
+      return GL_FALSE;
+   }
+
+   /* overlapping src/dst doesn't matter, just determine Y direction */
+   if (srcY < dstY) {
+      /* top-down  max-to-min */
+      srcY = srcY + height - 1;
+      dstY = dstY + height - 1;
+      yStep = -1;
+   }
+   else {
+      /* bottom-up  min-to-max */
+      yStep = 1;
+   }
+
+   for (row = 0; row < height; row++) {
+      GLuint temp[MAX_WIDTH][4];
+      srcRb->GetRow(ctx, srcRb, width, srcX, srcY, temp);
+      dstRb->PutRow(ctx, dstRb, width, dstX, dstY, temp, NULL);
+      srcY += yStep;
+      dstY += yStep;
+   }
+
+   return GL_TRUE;
+}
+
+
+/**
+ * Do software-based glCopyPixels.
+ * By time we get here, all parameters will have been error-checked.
+ */
+void
+_swrast_CopyPixels( GLcontext *ctx,
+		    GLint srcx, GLint srcy, GLsizei width, GLsizei height,
+		    GLint destx, GLint desty, GLenum type )
+{
+   SWcontext *swrast = SWRAST_CONTEXT(ctx);
+   swrast_render_start(ctx);
+      
+   if (swrast->NewState)
+      _swrast_validate_derived( ctx );
+
+   if (!fast_copy_pixels(ctx, srcx, srcy, width, height, destx, desty, type)) {
+      switch (type) {
+      case GL_COLOR:
+         if (ctx->Visual.rgbMode) {
+            copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
+         }
+         else {
+            copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
+         }
+         break;
+      case GL_DEPTH:
+         copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
+         break;
+      case GL_STENCIL:
+         copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
+         break;
+      case GL_DEPTH_STENCIL_EXT:
+         copy_depth_stencil_pixels(ctx, srcx, srcy, width, height, destx, desty);
+         break;
+      default:
+         _mesa_problem(ctx, "unexpected type in _swrast_CopyPixels");
+      }
+   }
+
+   swrast_render_finish(ctx);
+}