Moved software rasterizer functionality to new directory.

1 files changed, 821 insertions, 0 deletions

diff --git a/src/mesa/swrast/s_copypix.c b/src/mesa/swrast/s_copypix.c
new file mode 100644
index 00000000000..eddfe390371
--- /dev/null
+++ b/src/mesa/swrast/s_copypix.c
@@ -0,0 +1,821 @@
+/* $Id: s_copypix.c,v 1.1 2000/10/31 18:00:04 keithw Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.5
+ * 
+ * Copyright (C) 1999-2000  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 "colormac.h"
+#include "context.h"
+#include "convolve.h"
+#include "feedback.h"
+#include "macros.h"
+#include "mem.h"
+#include "mmath.h"
+#include "pixel.h"
+
+#include "s_depth.h"
+#include "s_imaging.h"
+#include "s_pixeltex.h"
+#include "s_span.h"
+#include "s_stencil.h"
+#include "s_texture.h"
+#include "s_zoom.h"
+
+
+
+/*
+ * Determine if there's overlap in an image copy
+ */
+static GLboolean
+regions_overlap(int srcx, int srcy, int dstx, int dsty, int width, int height,
+                float zoomX, float zoomY)
+{
+   if ((srcx > dstx + (width * zoomX) + 1) || (srcx + width + 1 < dstx)) {
+      return GL_FALSE;
+   }
+   else if ((srcy < dsty) && (srcy + height < dsty + (height * zoomY))) {
+      return GL_FALSE;
+   }
+   else if ((srcy > dsty) && (srcy + height > dsty + (height * zoomY))) {
+      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)
+{
+   GLdepth zspan[MAX_WIDTH];
+   GLboolean quick_draw;
+   GLint row;
+   GLboolean changeBuffer;
+   GLchan *saveReadAlpha;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   const GLuint transferOps = ctx->ImageTransferState;
+   GLfloat *dest, *tmpImage, *convImage;
+
+   if (ctx->Depth.Test || ctx->Fog.Enabled) {
+      /* fill in array of z values */
+      GLdepth z = (GLdepth)
+         (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
+      GLint i;
+      for (i = 0; i < width; i++) {
+         zspan[i] = z;
+      }
+   }
+
+   if (ctx->RasterMask == 0
+       && !zoom
+       && destx >= 0
+       && destx + width <= ctx->DrawBuffer->Width) {
+      quick_draw = GL_TRUE;
+   }
+   else {
+      quick_draw = GL_FALSE;
+   }
+
+   /* If read and draw buffer are different we must do buffer switching */
+   saveReadAlpha = ctx->ReadBuffer->Alpha;
+   changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
+               || ctx->DrawBuffer != ctx->ReadBuffer;
+
+
+   /* allocate space for GLfloat image */
+   tmpImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
+   if (!tmpImage) {
+      gl_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+      return;
+   }
+   convImage = (GLfloat *) MALLOC(width * height * 4 * sizeof(GLfloat));
+   if (!convImage) {
+      FREE(tmpImage);
+      gl_error(ctx, GL_OUT_OF_MEMORY, "glCopyPixels");
+      return;
+   }
+
+   dest = tmpImage;
+
+   if (changeBuffer) {
+      (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                    ctx->Pixel.DriverReadBuffer );
+      if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
+         ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
+      else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
+         ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
+      else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
+         ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
+      else
+         ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
+   }
+
+   /* read source image */
+   dest = tmpImage;
+   for (row = 0; row < height; row++) {
+      GLchan rgba[MAX_WIDTH][4];
+      GLint i;
+      gl_read_rgba_span(ctx, ctx->ReadBuffer, width, srcx, srcy + row, rgba);
+      /* convert GLchan to GLfloat */
+      for (i = 0; i < width; i++) {
+         *dest++ = (GLfloat) rgba[i][RCOMP] * (1.0F / CHAN_MAXF);
+         *dest++ = (GLfloat) rgba[i][GCOMP] * (1.0F / CHAN_MAXF);
+         *dest++ = (GLfloat) rgba[i][BCOMP] * (1.0F / CHAN_MAXF);
+         *dest++ = (GLfloat) rgba[i][ACOMP] * (1.0F / CHAN_MAXF);
+      }
+   }
+
+   /* read from the draw buffer again (in case of blending) */
+   if (changeBuffer) {
+      (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                    ctx->Color.DriverDrawBuffer );
+      ctx->ReadBuffer->Alpha = saveReadAlpha;
+   }
+
+   /* do image transfer ops up until convolution */
+   for (row = 0; row < height; row++) {
+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) tmpImage + row * width * 4;
+
+      /* scale & bias */
+      if (transferOps & IMAGE_SCALE_BIAS_BIT) {
+         _mesa_scale_and_bias_rgba(ctx, width, rgba);
+      }
+      /* color map lookup */
+      if (transferOps & IMAGE_MAP_COLOR_BIT) {
+         _mesa_map_rgba(ctx, width, rgba);
+      }
+      /* GL_COLOR_TABLE lookup */
+      if (transferOps & IMAGE_COLOR_TABLE_BIT) {
+         _mesa_lookup_rgba(&ctx->ColorTable, 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);
+   }
+   FREE(tmpImage);
+
+   /* do remaining image transfer ops */
+   for (row = 0; row < height; row++) {
+      GLfloat (*rgba)[4] = (GLfloat (*)[4]) convImage + row * width * 4;
+
+      /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
+      if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
+         _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgba);
+      }
+      /* color matrix */
+      if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
+         _mesa_transform_rgba(ctx, width, rgba);
+      }
+      /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
+      if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
+         _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgba);
+      }
+      /* update histogram count */
+      if (transferOps & IMAGE_HISTOGRAM_BIT) {
+         _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgba);
+      }
+      /* update min/max */
+      if (transferOps & IMAGE_MIN_MAX_BIT) {
+         _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgba);
+      }
+   }
+
+   for (row = 0; row < height; row++) {
+      const GLfloat *src = convImage + row * width * 4;
+      GLchan rgba[MAX_WIDTH][4];
+      GLint i, dy;
+
+      /* clamp to [0,1] and convert float back to chan */
+      for (i = 0; i < width; i++) {
+         GLint r = (GLint) (src[i * 4 + RCOMP] * CHAN_MAXF);
+         GLint g = (GLint) (src[i * 4 + GCOMP] * CHAN_MAXF);
+         GLint b = (GLint) (src[i * 4 + BCOMP] * CHAN_MAXF);
+         GLint a = (GLint) (src[i * 4 + ACOMP] * CHAN_MAXF);
+         rgba[i][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+         rgba[i][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+         rgba[i][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+         rgba[i][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+      }
+
+      if (ctx->Texture.ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
+         GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
+         GLchan primary_rgba[MAX_WIDTH][4];
+         GLuint unit;
+         /* XXX not sure how multitexture is supposed to work here */
+
+         MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
+
+         for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++) {
+            _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
+                              s, t, r, q);
+            gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
+                              primary_rgba, rgba);
+         }
+      }
+
+      /* write row to framebuffer */
+
+      dy = desty + row;
+      if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
+         (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy, 
+				       (const GLchan (*)[4])rgba, NULL );
+      }
+      else if (zoom) {
+         gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0, 
+				    (const GLchan (*)[4])rgba, desty);
+      }
+      else {
+         gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
+      }
+   }
+
+   FREE(convImage);
+}
+
+
+/*
+ * RGBA copypixels
+ */
+static void
+copy_rgba_pixels(GLcontext *ctx, GLint srcx, GLint srcy,
+                 GLint width, GLint height, GLint destx, GLint desty)
+{
+   GLdepth zspan[MAX_WIDTH];
+   GLchan rgba[MAX_WIDTH][4];
+   GLchan *tmpImage,*p;
+   GLboolean quick_draw;
+   GLint sy, dy, stepy;
+   GLint i, j;
+   GLboolean changeBuffer;
+   GLchan *saveReadAlpha;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   GLint overlapping;
+   const GLuint transferOps = ctx->ImageTransferState;
+
+   if (ctx->Pixel.Convolution2DEnabled || ctx->Pixel.Separable2DEnabled) {
+      copy_conv_rgba_pixels(ctx, srcx, srcy, width, height, destx, desty);
+      return;
+   }
+
+   /* Determine if copy should be done bottom-to-top or top-to-bottom */
+   if (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;
+   }
+
+   overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                 ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+
+   if (ctx->Depth.Test || ctx->Fog.Enabled) {
+      /* fill in array of z values */
+      GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
+      for (i=0;i<width;i++) {
+         zspan[i] = z;
+      }
+   }
+
+   if (ctx->RasterMask == 0
+       && !zoom
+       && destx >= 0
+       && destx + width <= ctx->DrawBuffer->Width) {
+      quick_draw = GL_TRUE;
+   }
+   else {
+      quick_draw = GL_FALSE;
+   }
+
+   /* If read and draw buffer are different we must do buffer switching */
+   saveReadAlpha = ctx->ReadBuffer->Alpha;
+   changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
+               || ctx->DrawBuffer != ctx->ReadBuffer;
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLchan *) MALLOC(width * height * sizeof(GLchan) * 4);
+      if (!tmpImage) {
+         gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      p = tmpImage;
+      if (changeBuffer) {
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                       ctx->Pixel.DriverReadBuffer );
+         if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT)
+            ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
+         else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT)
+            ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
+         else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT)
+            ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
+         else
+            ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
+      }
+      for (j = 0; j < height; j++, ssy += stepy) {
+         gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, ssy,
+                            (GLchan (*)[4]) p );
+         p += (width * sizeof(GLchan) * 4);
+      }
+      p = tmpImage;
+   }
+   else {
+      tmpImage = NULL;  /* silence compiler warnings */
+      p = NULL;
+   }
+
+   for (j = 0; j < height; j++, sy += stepy, dy += stepy) {
+      /* Get source pixels */
+      if (overlapping) {
+         /* get from buffered image */
+         MEMCPY(rgba, p, width * sizeof(GLchan) * 4);
+         p += (width * sizeof(GLchan) * 4);
+      }
+      else {
+         /* get from framebuffer */
+         if (changeBuffer) {
+            (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                          ctx->Pixel.DriverReadBuffer );
+            if (ctx->Pixel.DriverReadBuffer == GL_FRONT_LEFT) {
+               ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontLeftAlpha;
+            }
+            else if (ctx->Pixel.DriverReadBuffer == GL_BACK_LEFT) {
+               ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackLeftAlpha;
+            }
+            else if (ctx->Pixel.DriverReadBuffer == GL_FRONT_RIGHT) {
+               ctx->ReadBuffer->Alpha = ctx->ReadBuffer->FrontRightAlpha;
+            }
+            else {
+               ctx->ReadBuffer->Alpha = ctx->ReadBuffer->BackRightAlpha;
+            }
+         }
+         gl_read_rgba_span( ctx, ctx->ReadBuffer, width, srcx, sy, rgba );
+      }
+
+      if (changeBuffer) {
+         /* read from the draw buffer again (in case of blending) */
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                       ctx->Color.DriverDrawBuffer );
+         ctx->ReadBuffer->Alpha = saveReadAlpha;
+      }
+
+      if (transferOps) {
+         const GLfloat scale = (1.0F / CHAN_MAXF);
+         GLfloat rgbaFloat[MAX_WIDTH][4];
+         GLuint k;
+         /* convert chan to float */
+         for (k = 0; k < width; k++) {
+            rgbaFloat[k][RCOMP] = (GLfloat) rgba[k][RCOMP] * scale;
+            rgbaFloat[k][GCOMP] = (GLfloat) rgba[k][GCOMP] * scale;
+            rgbaFloat[k][BCOMP] = (GLfloat) rgba[k][BCOMP] * scale;
+            rgbaFloat[k][ACOMP] = (GLfloat) rgba[k][ACOMP] * scale;
+         }
+         /* scale & bias */
+         if (transferOps & IMAGE_SCALE_BIAS_BIT) {
+            _mesa_scale_and_bias_rgba(ctx, width, rgbaFloat);
+         }
+         /* color map lookup */
+         if (transferOps & IMAGE_MAP_COLOR_BIT) {
+            _mesa_map_rgba(ctx, width, rgbaFloat);
+         }
+         /* GL_COLOR_TABLE lookup */
+         if (transferOps & IMAGE_COLOR_TABLE_BIT) {
+            _mesa_lookup_rgba(&ctx->ColorTable, width, rgbaFloat);
+         }
+         /* convolution */
+         if (transferOps & IMAGE_CONVOLUTION_BIT) {
+            /* XXX to do */
+         }
+         /* GL_POST_CONVOLUTION_COLOR_TABLE lookup */
+         if (transferOps & IMAGE_POST_CONVOLUTION_COLOR_TABLE_BIT) {
+            _mesa_lookup_rgba(&ctx->PostConvolutionColorTable, width, rgbaFloat);
+         }
+         /* color matrix */
+         if (transferOps & IMAGE_COLOR_MATRIX_BIT) {
+            _mesa_transform_rgba(ctx, width, rgbaFloat);
+         }
+         /* GL_POST_COLOR_MATRIX_COLOR_TABLE lookup */
+         if (transferOps & IMAGE_POST_COLOR_MATRIX_COLOR_TABLE_BIT) {
+            _mesa_lookup_rgba(&ctx->PostColorMatrixColorTable, width, rgbaFloat);
+         }
+         /* update histogram count */
+         if (transferOps & IMAGE_HISTOGRAM_BIT) {
+            _mesa_update_histogram(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
+         }
+         /* update min/max */
+         if (transferOps & IMAGE_MIN_MAX_BIT) {
+            _mesa_update_minmax(ctx, width, (CONST GLfloat (*)[4]) rgbaFloat);
+         }
+         /* clamp to [0,1] and convert float back to chan */
+         for (k = 0; k < width; k++) {
+            GLint r = (GLint) (rgbaFloat[k][RCOMP] * CHAN_MAXF);
+            GLint g = (GLint) (rgbaFloat[k][GCOMP] * CHAN_MAXF);
+            GLint b = (GLint) (rgbaFloat[k][BCOMP] * CHAN_MAXF);
+            GLint a = (GLint) (rgbaFloat[k][ACOMP] * CHAN_MAXF);
+            rgba[k][RCOMP] = (GLchan) CLAMP(r, 0, CHAN_MAX);
+            rgba[k][GCOMP] = (GLchan) CLAMP(g, 0, CHAN_MAX);
+            rgba[k][BCOMP] = (GLchan) CLAMP(b, 0, CHAN_MAX);
+            rgba[k][ACOMP] = (GLchan) CLAMP(a, 0, CHAN_MAX);
+         }
+      }
+
+      if (ctx->Texture.ReallyEnabled && ctx->Pixel.PixelTextureEnabled) {
+         GLfloat s[MAX_WIDTH], t[MAX_WIDTH], r[MAX_WIDTH], q[MAX_WIDTH];
+         GLchan primary_rgba[MAX_WIDTH][4];
+         GLuint unit;
+         /* XXX not sure how multitexture is supposed to work here */
+
+         MEMCPY(primary_rgba, rgba, 4 * width * sizeof(GLchan));
+
+         for (unit = 0; unit < MAX_TEXTURE_UNITS; unit++) {
+            _mesa_pixeltexgen(ctx, width, (const GLchan (*)[4]) rgba,
+                              s, t, r, q);
+            gl_texture_pixels(ctx, unit, width, s, t, r, NULL,
+                              primary_rgba, rgba);
+         }
+      }
+
+      if (quick_draw && dy >= 0 && dy < ctx->DrawBuffer->Height) {
+         (*ctx->Driver.WriteRGBASpan)( ctx, width, destx, dy, 
+				       (const GLchan (*)[4])rgba, NULL );
+      }
+      else if (zoom) {
+         gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
+				    (const GLchan (*)[4])rgba, desty);
+      }
+      else {
+         gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, rgba, GL_BITMAP );
+      }
+   }
+
+   if (overlapping)
+      FREE(tmpImage);
+}
+
+
+static void copy_ci_pixels( GLcontext *ctx,
+                            GLint srcx, GLint srcy, GLint width, GLint height,
+                            GLint destx, GLint desty )
+{
+   GLdepth zspan[MAX_WIDTH];
+   GLuint *tmpImage,*p;
+   GLint sy, dy, stepy;
+   GLint i, j;
+   GLboolean changeBuffer;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
+   GLint overlapping;
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (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;
+   }
+
+   overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                 ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+
+   if (ctx->Depth.Test || ctx->Fog.Enabled) {
+      /* fill in array of z values */
+      GLdepth z = (GLdepth) (ctx->Current.RasterPos[2] * ctx->Visual.DepthMax);
+      for (i=0;i<width;i++) {
+         zspan[i] = z;
+      }
+   }
+
+   /* If read and draw buffer are different we must do buffer switching */
+   changeBuffer = ctx->Pixel.ReadBuffer != ctx->Color.DrawBuffer
+               || ctx->DrawBuffer != ctx->ReadBuffer;
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLuint *) MALLOC(width * height * sizeof(GLuint));
+      if (!tmpImage) {
+         gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      p = tmpImage;
+      if (changeBuffer) {
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                       ctx->Pixel.DriverReadBuffer );
+      }
+      for (j = 0; j < height; j++, ssy += stepy) {
+         gl_read_index_span( ctx, ctx->ReadBuffer, 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) {
+      GLuint indexes[MAX_WIDTH];
+      if (overlapping) {
+         MEMCPY(indexes, p, width * sizeof(GLuint));
+         p += width;
+      }
+      else {
+         if (changeBuffer) {
+            (*ctx->Driver.SetReadBuffer)( ctx, ctx->ReadBuffer,
+                                          ctx->Pixel.DriverReadBuffer );
+         }
+         gl_read_index_span( ctx, ctx->ReadBuffer, width, srcx, sy, indexes );
+      }
+
+      if (changeBuffer) {
+         /* set read buffer back to draw buffer (in case of logicops) */
+         (*ctx->Driver.SetReadBuffer)( ctx, ctx->DrawBuffer,
+                                       ctx->Color.DriverDrawBuffer );
+      }
+
+      if (shift_or_offset) {
+         _mesa_shift_and_offset_ci( ctx, width, indexes );
+      }
+      if (ctx->Pixel.MapColorFlag) {
+         _mesa_map_ci( ctx, width, indexes );
+      }
+
+      if (zoom) {
+         gl_write_zoomed_index_span( ctx, width, destx, dy, zspan, 0, indexes, desty );
+      }
+      else {
+         gl_write_index_span(ctx, width, destx, dy, zspan, 0, indexes, GL_BITMAP);
+      }
+   }
+
+   if (overlapping)
+      FREE(tmpImage);
+}
+
+
+
+/*
+ * TODO: Optimize!!!!
+ */
+static void copy_depth_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+                               GLint width, GLint height,
+                               GLint destx, GLint desty )
+{
+   GLfloat depth[MAX_WIDTH];
+   GLdepth zspan[MAX_WIDTH];
+   GLfloat *p, *tmpImage;
+   GLuint indexes[MAX_WIDTH];
+   GLchan rgba[MAX_WIDTH][4];
+   GLint sy, dy, stepy;
+   GLint i, j;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   GLint overlapping;
+
+   if (!ctx->ReadBuffer->DepthBuffer || !ctx->DrawBuffer->DepthBuffer) {
+      gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
+      return;
+   }
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (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;
+   }
+
+   overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                 ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+
+   /* setup colors or indexes */
+   if (ctx->Visual.RGBAflag) {
+      GLuint *rgba32 = (GLuint *) rgba;
+      GLuint color = *(GLuint*)( ctx->Current.Color );
+      for (i = 0; i < width; i++) {
+         rgba32[i] = color;
+      }
+   }
+   else {
+      for (i = 0; i < width; i++) {
+         indexes[i] = ctx->Current.Index;
+      }
+   }
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLfloat *) MALLOC(width * height * sizeof(GLfloat));
+      if (!tmpImage) {
+         gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      p = tmpImage;
+      for (j = 0; j < height; j++, ssy += stepy) {
+         _mesa_read_depth_span_float(ctx, 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) {
+      if (overlapping) {
+         MEMCPY(depth, p, width * sizeof(GLfloat));
+         p += width;
+      }
+      else {
+         _mesa_read_depth_span_float(ctx, width, srcx, sy, depth);
+      }
+
+      for (i = 0; i < width; i++) {
+         GLfloat d = depth[i] * ctx->Pixel.DepthScale + ctx->Pixel.DepthBias;
+         zspan[i] = (GLdepth) (CLAMP(d, 0.0F, 1.0F) * ctx->Visual.DepthMax);
+      }
+
+      if (ctx->Visual.RGBAflag) {
+         if (zoom) {
+            gl_write_zoomed_rgba_span( ctx, width, destx, dy, zspan, 0,
+				       (const GLchan (*)[4])rgba, desty );
+         }
+         else {
+            gl_write_rgba_span( ctx, width, destx, dy, zspan, 0, 
+				rgba, GL_BITMAP);
+         }
+      }
+      else {
+         if (zoom) {
+            gl_write_zoomed_index_span( ctx, width, destx, dy,
+                                        zspan, 0, indexes, desty );
+         }
+         else {
+            gl_write_index_span( ctx, width, destx, dy,
+                                 zspan, 0, indexes, GL_BITMAP );
+         }
+      }
+   }
+
+  if (overlapping)
+     FREE(tmpImage);
+}
+
+
+
+static void copy_stencil_pixels( GLcontext *ctx, GLint srcx, GLint srcy,
+                                 GLint width, GLint height,
+                                 GLint destx, GLint desty )
+{
+   GLint sy, dy, stepy;
+   GLint j;
+   GLstencil *p, *tmpImage;
+   const GLboolean zoom = ctx->Pixel.ZoomX != 1.0F || ctx->Pixel.ZoomY != 1.0F;
+   const GLboolean shift_or_offset = ctx->Pixel.IndexShift || ctx->Pixel.IndexOffset;
+   GLint overlapping;
+
+   if (!ctx->DrawBuffer->Stencil || !ctx->ReadBuffer->Stencil) {
+      gl_error( ctx, GL_INVALID_OPERATION, "glCopyPixels" );
+      return;
+   }
+
+   /* Determine if copy should be bottom-to-top or top-to-bottom */
+   if (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;
+   }
+
+   overlapping = regions_overlap(srcx, srcy, destx, desty, width, height,
+                                 ctx->Pixel.ZoomX, ctx->Pixel.ZoomY);
+
+   if (overlapping) {
+      GLint ssy = sy;
+      tmpImage = (GLstencil *) MALLOC(width * height * sizeof(GLstencil));
+      if (!tmpImage) {
+         gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyPixels" );
+         return;
+      }
+      p = tmpImage;
+      for (j = 0; j < height; j++, ssy += stepy) {
+         _mesa_read_stencil_span( ctx, 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];
+
+      if (overlapping) {
+         MEMCPY(stencil, p, width * sizeof(GLstencil));
+         p += width;
+      }
+      else {
+         _mesa_read_stencil_span( ctx, width, srcx, sy, stencil );
+      }
+
+      if (shift_or_offset) {
+         _mesa_shift_and_offset_stencil( ctx, width, stencil );
+      }
+      if (ctx->Pixel.MapStencilFlag) {
+         _mesa_map_stencil( ctx, width, stencil );
+      }
+
+      if (zoom) {
+         gl_write_zoomed_stencil_span( ctx, width, destx, dy, stencil, desty );
+      }
+      else {
+         _mesa_write_stencil_span( ctx, width, destx, dy, stencil );
+      }
+   }
+
+   if (overlapping)
+      FREE(tmpImage);
+}
+
+
+
+
+void
+_swrast_CopyPixels( GLcontext *ctx,
+		    GLint srcx, GLint srcy, GLsizei width, GLsizei height,
+		    GLint destx, GLint desty,
+		    GLenum type )
+{
+   if (type == GL_COLOR && ctx->Visual.RGBAflag) {
+      copy_rgba_pixels( ctx, srcx, srcy, width, height, destx, desty );
+   }
+   else if (type == GL_COLOR && !ctx->Visual.RGBAflag) {
+      copy_ci_pixels( ctx, srcx, srcy, width, height, destx, desty );
+   }
+   else if (type == GL_DEPTH) {
+      copy_depth_pixels( ctx, srcx, srcy, width, height, destx, desty );
+   }
+   else if (type == GL_STENCIL) {
+      copy_stencil_pixels( ctx, srcx, srcy, width, height, destx, desty );
+   }
+   else {
+      gl_error( ctx, GL_INVALID_ENUM, "glCopyPixels" );
+   }
+}