Initial revision

1 files changed, 2344 insertions, 0 deletions

diff --git a/src/mesa/main/teximage.c b/src/mesa/main/teximage.c
new file mode 100644
index 00000000000..f2f301e398b
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+++ b/src/mesa/main/teximage.c
@@ -0,0 +1,2344 @@
+/* $Id: teximage.c,v 1.1 1999/08/19 00:55:41 jtg Exp $ */
+
+/*
+ * Mesa 3-D graphics library
+ * Version:  3.1
+ * 
+ * Copyright (C) 1999  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.
+ */
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "context.h"
+#include "image.h"
+#include "macros.h"
+#include "mmath.h"
+#include "span.h"
+#include "teximage.h"
+#include "texstate.h"
+#include "types.h"
+#ifdef XFree86Server
+#include "GL/xf86glx.h"
+#endif
+#endif
+
+
+/*
+ * NOTES:
+ *
+ * The internal texture storage convension is an array of N GLubytes
+ * where N = width * height * components.  There is no padding.
+ */
+
+
+
+
+/*
+ * Compute log base 2 of n.
+ * If n isn't an exact power of two return -1.
+ * If n<0 return -1.
+ */
+static int logbase2( int n )
+{
+   GLint i = 1;
+   GLint log2 = 0;
+
+   if (n<0) {
+      return -1;
+   }
+
+   while ( n > i ) {
+      i *= 2;
+      log2++;
+   }
+   if (i != n) {
+      return -1;
+   }
+   else {
+      return log2;
+   }
+}
+
+
+
+/*
+ * Given an internal texture format enum or 1, 2, 3, 4 return the
+ * corresponding _base_ internal format:  GL_ALPHA, GL_LUMINANCE,
+ * GL_LUMANCE_ALPHA, GL_INTENSITY, GL_RGB, or GL_RGBA.  Return -1 if
+ * invalid enum.
+ */
+static GLint decode_internal_format( GLint format )
+{
+   switch (format) {
+      case GL_ALPHA:
+      case GL_ALPHA4:
+      case GL_ALPHA8:
+      case GL_ALPHA12:
+      case GL_ALPHA16:
+         return GL_ALPHA;
+      case 1:
+      case GL_LUMINANCE:
+      case GL_LUMINANCE4:
+      case GL_LUMINANCE8:
+      case GL_LUMINANCE12:
+      case GL_LUMINANCE16:
+         return GL_LUMINANCE;
+      case 2:
+      case GL_LUMINANCE_ALPHA:
+      case GL_LUMINANCE4_ALPHA4:
+      case GL_LUMINANCE6_ALPHA2:
+      case GL_LUMINANCE8_ALPHA8:
+      case GL_LUMINANCE12_ALPHA4:
+      case GL_LUMINANCE12_ALPHA12:
+      case GL_LUMINANCE16_ALPHA16:
+         return GL_LUMINANCE_ALPHA;
+      case GL_INTENSITY:
+      case GL_INTENSITY4:
+      case GL_INTENSITY8:
+      case GL_INTENSITY12:
+      case GL_INTENSITY16:
+         return GL_INTENSITY;
+      case 3:
+      case GL_RGB:
+      case GL_R3_G3_B2:
+      case GL_RGB4:
+      case GL_RGB5:
+      case GL_RGB8:
+      case GL_RGB10:
+      case GL_RGB12:
+      case GL_RGB16:
+         return GL_RGB;
+      case 4:
+      case GL_RGBA:
+      case GL_RGBA2:
+      case GL_RGBA4:
+      case GL_RGB5_A1:
+      case GL_RGBA8:
+      case GL_RGB10_A2:
+      case GL_RGBA12:
+      case GL_RGBA16:
+         return GL_RGBA;
+      case GL_COLOR_INDEX:
+      case GL_COLOR_INDEX1_EXT:
+      case GL_COLOR_INDEX2_EXT:
+      case GL_COLOR_INDEX4_EXT:
+      case GL_COLOR_INDEX8_EXT:
+      case GL_COLOR_INDEX12_EXT:
+      case GL_COLOR_INDEX16_EXT:
+         return GL_COLOR_INDEX;
+      default:
+         return -1;  /* error */
+   }
+}
+
+
+
+/*
+ * Given an internal texture format enum or 1, 2, 3, 4 return the
+ * corresponding _base_ internal format:  GL_ALPHA, GL_LUMINANCE,
+ * GL_LUMANCE_ALPHA, GL_INTENSITY, GL_RGB, or GL_RGBA.  Return the
+ * number of components for the format.  Return -1 if invalid enum.
+ */
+static GLint components_in_intformat( GLint format )
+{
+   switch (format) {
+      case GL_ALPHA:
+      case GL_ALPHA4:
+      case GL_ALPHA8:
+      case GL_ALPHA12:
+      case GL_ALPHA16:
+         return 1;
+      case 1:
+      case GL_LUMINANCE:
+      case GL_LUMINANCE4:
+      case GL_LUMINANCE8:
+      case GL_LUMINANCE12:
+      case GL_LUMINANCE16:
+         return 1;
+      case 2:
+      case GL_LUMINANCE_ALPHA:
+      case GL_LUMINANCE4_ALPHA4:
+      case GL_LUMINANCE6_ALPHA2:
+      case GL_LUMINANCE8_ALPHA8:
+      case GL_LUMINANCE12_ALPHA4:
+      case GL_LUMINANCE12_ALPHA12:
+      case GL_LUMINANCE16_ALPHA16:
+         return 2;
+      case GL_INTENSITY:
+      case GL_INTENSITY4:
+      case GL_INTENSITY8:
+      case GL_INTENSITY12:
+      case GL_INTENSITY16:
+         return 1;
+      case 3:
+      case GL_RGB:
+      case GL_R3_G3_B2:
+      case GL_RGB4:
+      case GL_RGB5:
+      case GL_RGB8:
+      case GL_RGB10:
+      case GL_RGB12:
+      case GL_RGB16:
+         return 3;
+      case 4:
+      case GL_RGBA:
+      case GL_RGBA2:
+      case GL_RGBA4:
+      case GL_RGB5_A1:
+      case GL_RGBA8:
+      case GL_RGB10_A2:
+      case GL_RGBA12:
+      case GL_RGBA16:
+         return 4;
+      case GL_COLOR_INDEX:
+      case GL_COLOR_INDEX1_EXT:
+      case GL_COLOR_INDEX2_EXT:
+      case GL_COLOR_INDEX4_EXT:
+      case GL_COLOR_INDEX8_EXT:
+      case GL_COLOR_INDEX12_EXT:
+      case GL_COLOR_INDEX16_EXT:
+         return 1;
+      default:
+         return -1;  /* error */
+   }
+}
+
+
+
+struct gl_texture_image *gl_alloc_texture_image( void )
+{
+   return (struct gl_texture_image *) calloc( 1, sizeof(struct gl_texture_image) );
+}
+
+
+
+void gl_free_texture_image( struct gl_texture_image *teximage )
+{
+   if (teximage->Data) {
+      free( teximage->Data );
+   }
+   free( teximage );
+}
+
+
+
+/*
+ * Examine the texImage->Format field and set the Red, Green, Blue, etc
+ * texel component sizes to default values.
+ * These fields are set only here by core Mesa but device drivers may
+ * overwritting these fields to indicate true texel resolution.
+ */
+static void set_teximage_component_sizes( struct gl_texture_image *texImage )
+{
+   switch (texImage->Format) {
+      case GL_ALPHA:
+         texImage->RedBits = 0;
+         texImage->GreenBits = 0;
+         texImage->BlueBits = 0;
+         texImage->AlphaBits = 8;
+         texImage->IntensityBits = 0;
+         texImage->LuminanceBits = 0;
+         texImage->IndexBits = 0;
+         break;
+      case GL_LUMINANCE:
+         texImage->RedBits = 0;
+         texImage->GreenBits = 0;
+         texImage->BlueBits = 0;
+         texImage->AlphaBits = 0;
+         texImage->IntensityBits = 0;
+         texImage->LuminanceBits = 8;
+         texImage->IndexBits = 0;
+         break;
+      case GL_LUMINANCE_ALPHA:
+         texImage->RedBits = 0;
+         texImage->GreenBits = 0;
+         texImage->BlueBits = 0;
+         texImage->AlphaBits = 8;
+         texImage->IntensityBits = 0;
+         texImage->LuminanceBits = 8;
+         texImage->IndexBits = 0;
+         break;
+      case GL_INTENSITY:
+         texImage->RedBits = 0;
+         texImage->GreenBits = 0;
+         texImage->BlueBits = 0;
+         texImage->AlphaBits = 0;
+         texImage->IntensityBits = 8;
+         texImage->LuminanceBits = 0;
+         texImage->IndexBits = 0;
+         break;
+      case GL_RGB:
+         texImage->RedBits = 8;
+         texImage->GreenBits = 8;
+         texImage->BlueBits = 8;
+         texImage->AlphaBits = 0;
+         texImage->IntensityBits = 0;
+         texImage->LuminanceBits = 0;
+         texImage->IndexBits = 0;
+         break;
+      case GL_RGBA:
+         texImage->RedBits = 8;
+         texImage->GreenBits = 8;
+         texImage->BlueBits = 8;
+         texImage->AlphaBits = 8;
+         texImage->IntensityBits = 0;
+         texImage->LuminanceBits = 0;
+         texImage->IndexBits = 0;
+         break;
+      case GL_COLOR_INDEX:
+         texImage->RedBits = 0;
+         texImage->GreenBits = 0;
+         texImage->BlueBits = 0;
+         texImage->AlphaBits = 0;
+         texImage->IntensityBits = 0;
+         texImage->LuminanceBits = 0;
+         texImage->IndexBits = 8;
+         break;
+      default:
+         gl_problem(NULL, "unexpected format in set_teximage_component_sizes");
+   }
+}
+
+
+/* Need this to prevent an out-of-bounds memory access when using
+ * X86 optimized code.
+ */
+#ifdef USE_X86_ASM
+#  define EXTRA_BYTE 1
+#else
+#  define EXTRA_BYTE 0
+#endif
+
+
+/*
+ * Given a gl_image, apply the pixel transfer scale, bias, and mapping
+ * to produce a gl_texture_image.  Convert image data to GLubytes.
+ * Input:  image - the incoming gl_image
+ *         internalFormat - desired format of resultant texture
+ *         border - texture border width (0 or 1)
+ * Return:  pointer to a gl_texture_image or NULL if an error occurs.
+ */
+static struct gl_texture_image *
+image_to_texture( GLcontext *ctx, const struct gl_image *image,
+                  GLint internalFormat, GLint border )
+{
+   GLint components;
+   struct gl_texture_image *texImage;
+   GLint numPixels, pixel;
+   GLboolean scaleOrBias;
+
+   assert(image);
+   assert(image->Width>0);
+   assert(image->Height>0);
+   assert(image->Depth>0);
+
+   /*   internalFormat = decode_internal_format(internalFormat);*/
+   components = components_in_intformat(internalFormat);
+   numPixels = image->Width * image->Height * image->Depth;
+
+   texImage = gl_alloc_texture_image();
+   if (!texImage)
+      return NULL;
+
+   texImage->Format = (GLenum) decode_internal_format(internalFormat);
+   set_teximage_component_sizes( texImage );
+   texImage->IntFormat = (GLenum) internalFormat;
+   texImage->Border = border;
+   texImage->Width = image->Width;
+   texImage->Height = image->Height;
+   texImage->Depth = image->Depth;
+   texImage->WidthLog2 = logbase2(image->Width - 2*border);
+   if (image->Height==1)  /* 1-D texture */
+      texImage->HeightLog2 = 0;
+   else
+      texImage->HeightLog2 = logbase2(image->Height - 2*border);
+   if (image->Depth==1)   /* 2-D texture */
+      texImage->DepthLog2 = 0;
+   else
+      texImage->DepthLog2 = logbase2(image->Depth - 2*border);
+   texImage->Width2 = 1 << texImage->WidthLog2;
+   texImage->Height2 = 1 << texImage->HeightLog2;
+   texImage->Depth2 = 1 << texImage->DepthLog2;
+   texImage->MaxLog2 = MAX2( texImage->WidthLog2, texImage->HeightLog2 );
+   texImage->Data = (GLubyte *) malloc( numPixels * components + EXTRA_BYTE );
+
+   if (!texImage->Data) {
+      /* out of memory */
+      gl_free_texture_image( texImage );
+      return NULL;
+   }
+
+   /* Determine if scaling and/or biasing is needed */
+   if (ctx->Pixel.RedScale!=1.0F   || ctx->Pixel.RedBias!=0.0F ||
+       ctx->Pixel.GreenScale!=1.0F || ctx->Pixel.GreenBias!=0.0F ||
+       ctx->Pixel.BlueScale!=1.0F  || ctx->Pixel.BlueBias!=0.0F ||
+       ctx->Pixel.AlphaScale!=1.0F || ctx->Pixel.AlphaBias!=0.0F) {
+      scaleOrBias = GL_TRUE;
+   }
+   else {
+      scaleOrBias = GL_FALSE;
+   }
+
+   switch (image->Type) {
+      case GL_BITMAP:
+         {
+            GLint shift = ctx->Pixel.IndexShift;
+            GLint offset = ctx->Pixel.IndexOffset;
+            /* MapIto[RGBA]Size must be powers of two */
+            GLint rMask = ctx->Pixel.MapItoRsize-1;
+            GLint gMask = ctx->Pixel.MapItoGsize-1;
+            GLint bMask = ctx->Pixel.MapItoBsize-1;
+            GLint aMask = ctx->Pixel.MapItoAsize-1;
+            GLint i, j;
+            GLubyte *srcPtr = (GLubyte *) image->Data;
+
+            assert( image->Format==GL_COLOR_INDEX );
+
+            for (j=0; j<image->Height; j++) {
+               GLubyte bitMask = 128;
+               for (i=0; i<image->Width; i++) {
+                  GLint index;
+                  GLubyte red, green, blue, alpha;
+
+                  /* Fetch image color index */
+                  index = (*srcPtr & bitMask) ? 1 : 0;
+                  bitMask = bitMask >> 1;
+                  if (bitMask==0) {
+                     bitMask = 128;
+                     srcPtr++;
+                  }
+                  /* apply index shift and offset */
+                  if (shift>=0) {
+                     index = (index << shift) + offset;
+                  }
+                  else {
+                     index = (index >> -shift) + offset;
+                  }
+                  /* convert index to RGBA */
+                  red   = (GLint) (ctx->Pixel.MapItoR[index & rMask] * 255.0F);
+                  green = (GLint) (ctx->Pixel.MapItoG[index & gMask] * 255.0F);
+                  blue  = (GLint) (ctx->Pixel.MapItoB[index & bMask] * 255.0F);
+                  alpha = (GLint) (ctx->Pixel.MapItoA[index & aMask] * 255.0F);
+
+                  /* store texel (components are GLubytes in [0,255]) */
+                  pixel = j * image->Width + i;
+                  switch (texImage->Format) {
+                     case GL_ALPHA:
+                        texImage->Data[pixel] = alpha;
+                        break;
+                     case GL_LUMINANCE:
+                        texImage->Data[pixel] = red;
+                        break;
+                     case GL_LUMINANCE_ALPHA:
+                        texImage->Data[pixel*2+0] = red;
+                        texImage->Data[pixel*2+1] = alpha;
+                        break;
+                     case GL_INTENSITY:
+                        texImage->Data[pixel] = red;
+                        break;
+                     case GL_RGB:
+                        texImage->Data[pixel*3+0] = red;
+                        texImage->Data[pixel*3+1] = green;
+                        texImage->Data[pixel*3+2] = blue;
+                        break;
+                     case GL_RGBA:
+                        texImage->Data[pixel*4+0] = red;
+                        texImage->Data[pixel*4+1] = green;
+                        texImage->Data[pixel*4+2] = blue;
+                        texImage->Data[pixel*4+3] = alpha;
+                        break;
+                     default:
+                        gl_problem(ctx,"Bad format in image_to_texture");
+                        return NULL;
+                  }
+               }
+               if (bitMask!=128) {
+                  srcPtr++;
+               }
+            }
+         }
+         break;
+
+      case GL_UNSIGNED_BYTE:
+         if (image->Format == texImage->Format && !scaleOrBias && !ctx->Pixel.MapColorFlag) {
+            switch (image->Format) {
+               case GL_COLOR_INDEX:
+                  if (decode_internal_format(internalFormat)!=GL_COLOR_INDEX) {
+                     /* convert color index to RGBA */
+                     for (pixel=0; pixel<numPixels; pixel++) {
+                        GLint index = ((GLubyte*)image->Data)[pixel];
+                        index = (GLint) (255.0F * ctx->Pixel.MapItoR[index]);
+                        texImage->Data[pixel] = index;
+                     }
+                     numPixels = 0;
+                     break;
+                  }
+               case GL_ALPHA:
+               case GL_LUMINANCE:
+               case GL_INTENSITY:
+                  MEMCPY(texImage->Data, image->Data, numPixels * 1);
+                  numPixels = 0;
+                  break;
+               case GL_LUMINANCE_ALPHA:
+                  MEMCPY(texImage->Data, image->Data, numPixels * 2);
+                  numPixels = 0;
+                  break;
+               case GL_RGB:
+                  MEMCPY(texImage->Data, image->Data, numPixels * 3);
+                  numPixels = 0;
+                  break;
+               case GL_RGBA:
+                  MEMCPY(texImage->Data, image->Data, numPixels * 4);
+                  numPixels = 0;
+                  break;
+               default:
+                  break;
+            }
+         }
+         for (pixel=0; pixel<numPixels; pixel++) {
+            GLubyte red, green, blue, alpha;
+            switch (image->Format) {
+               case GL_COLOR_INDEX:
+                  if (decode_internal_format(internalFormat)==GL_COLOR_INDEX) {
+                     /* a paletted texture */
+                     GLint index = ((GLubyte*)image->Data)[pixel];
+                     red = index;
+                  }
+                  else {
+                     /* convert color index to RGBA */
+                     GLint index = ((GLubyte*)image->Data)[pixel];
+                     red   = (GLint) (255.0F * ctx->Pixel.MapItoR[index]);
+                     green = (GLint) (255.0F * ctx->Pixel.MapItoG[index]);
+                     blue  = (GLint) (255.0F * ctx->Pixel.MapItoB[index]);
+                     alpha = (GLint) (255.0F * ctx->Pixel.MapItoA[index]);
+                  }
+                  break;
+               case GL_RGB:
+                  /* Fetch image RGBA values */
+                  red   = ((GLubyte*) image->Data)[pixel*3+0];
+                  green = ((GLubyte*) image->Data)[pixel*3+1];
+                  blue  = ((GLubyte*) image->Data)[pixel*3+2];
+                  alpha = 255;
+                  break;
+               case GL_RGBA:
+                  red   = ((GLubyte*) image->Data)[pixel*4+0];
+                  green = ((GLubyte*) image->Data)[pixel*4+1];
+                  blue  = ((GLubyte*) image->Data)[pixel*4+2];
+                  alpha = ((GLubyte*) image->Data)[pixel*4+3];
+                  break;
+               case GL_RED:
+                  red   = ((GLubyte*) image->Data)[pixel];
+                  green = 0;
+                  blue  = 0;
+                  alpha = 255;
+                  break;
+               case GL_GREEN:
+                  red   = 0;
+                  green = ((GLubyte*) image->Data)[pixel];
+                  blue  = 0;
+                  alpha = 255;
+                  break;
+               case GL_BLUE:
+                  red   = 0;
+                  green = 0;
+                  blue  = ((GLubyte*) image->Data)[pixel];
+                  alpha = 255;
+                  break;
+               case GL_ALPHA:
+                  red   = 0;
+                  green = 0;
+                  blue  = 0;
+                  alpha = ((GLubyte*) image->Data)[pixel];
+                  break;
+               case GL_LUMINANCE: 
+                  red   = ((GLubyte*) image->Data)[pixel];
+                  green = red;
+                  blue  = red;
+                  alpha = 255;
+                  break;
+              case GL_LUMINANCE_ALPHA:
+                  red   = ((GLubyte*) image->Data)[pixel*2+0];
+                  green = red;
+                  blue  = red;
+                  alpha = ((GLubyte*) image->Data)[pixel*2+1];
+                  break;
+              default:
+                 gl_problem(ctx,"Bad format (2) in image_to_texture");
+                 return NULL;
+            }
+            
+            if (scaleOrBias || ctx->Pixel.MapColorFlag) {
+               /* Apply RGBA scale and bias */
+               GLfloat r = UBYTE_COLOR_TO_FLOAT_COLOR(red);
+               GLfloat g = UBYTE_COLOR_TO_FLOAT_COLOR(green);
+               GLfloat b = UBYTE_COLOR_TO_FLOAT_COLOR(blue);
+               GLfloat a = UBYTE_COLOR_TO_FLOAT_COLOR(alpha);
+               if (scaleOrBias) {
+                  /* r,g,b,a now in [0,1] */
+                  r = r * ctx->Pixel.RedScale   + ctx->Pixel.RedBias;
+                  g = g * ctx->Pixel.GreenScale + ctx->Pixel.GreenBias;
+                  b = b * ctx->Pixel.BlueScale  + ctx->Pixel.BlueBias;
+                  a = a * ctx->Pixel.AlphaScale + ctx->Pixel.AlphaBias;
+                  r = CLAMP( r, 0.0F, 1.0F );
+                  g = CLAMP( g, 0.0F, 1.0F );
+                  b = CLAMP( b, 0.0F, 1.0F );
+                  a = CLAMP( a, 0.0F, 1.0F );
+               }
+               /* Apply pixel maps */
+               if (ctx->Pixel.MapColorFlag) {
+                  GLint ir = (GLint) (r*ctx->Pixel.MapRtoRsize);
+                  GLint ig = (GLint) (g*ctx->Pixel.MapGtoGsize);
+                  GLint ib = (GLint) (b*ctx->Pixel.MapBtoBsize);
+                  GLint ia = (GLint) (a*ctx->Pixel.MapAtoAsize);
+                  r = ctx->Pixel.MapRtoR[ir];
+                  g = ctx->Pixel.MapGtoG[ig];
+                  b = ctx->Pixel.MapBtoB[ib];
+                  a = ctx->Pixel.MapAtoA[ia];
+               }
+               red   = (GLint) (r * 255.0F);
+               green = (GLint) (g * 255.0F);
+               blue  = (GLint) (b * 255.0F);
+               alpha = (GLint) (a * 255.0F);
+            }
+
+            /* store texel (components are GLubytes in [0,255]) */
+            switch (texImage->Format) {
+               case GL_COLOR_INDEX:
+                  texImage->Data[pixel] = red; /* really an index */
+                  break;
+               case GL_ALPHA:
+                  texImage->Data[pixel] = alpha;
+                  break;
+               case GL_LUMINANCE:
+                  texImage->Data[pixel] = red;
+                  break;
+               case GL_LUMINANCE_ALPHA:
+                  texImage->Data[pixel*2+0] = red;
+                  texImage->Data[pixel*2+1] = alpha;
+                  break;
+               case GL_INTENSITY:
+                  texImage->Data[pixel] = red;
+                  break;
+               case GL_RGB:
+                  texImage->Data[pixel*3+0] = red;
+                  texImage->Data[pixel*3+1] = green;
+                  texImage->Data[pixel*3+2] = blue;
+                  break;
+               case GL_RGBA:
+                  texImage->Data[pixel*4+0] = red;
+                  texImage->Data[pixel*4+1] = green;
+                  texImage->Data[pixel*4+2] = blue;
+                  texImage->Data[pixel*4+3] = alpha;
+                  break;
+               default:
+                  gl_problem(ctx,"Bad format (3) in image_to_texture");
+                  return NULL;
+            }
+         }
+         break;
+
+      case GL_FLOAT:
+         for (pixel=0; pixel<numPixels; pixel++) {
+            GLfloat red, green, blue, alpha;
+            switch (image->Format) {
+               case GL_COLOR_INDEX:
+                  if (decode_internal_format(internalFormat)==GL_COLOR_INDEX) {
+                     /* a paletted texture */
+                     GLint index = (GLint) ((GLfloat*) image->Data)[pixel];
+                     red = index;
+                  }
+                  else {
+                     GLint shift = ctx->Pixel.IndexShift;
+                     GLint offset = ctx->Pixel.IndexOffset;
+                     /* MapIto[RGBA]Size must be powers of two */
+                     GLint rMask = ctx->Pixel.MapItoRsize-1;
+                     GLint gMask = ctx->Pixel.MapItoGsize-1;
+                     GLint bMask = ctx->Pixel.MapItoBsize-1;
+                     GLint aMask = ctx->Pixel.MapItoAsize-1;
+                     /* Fetch image color index */
+                     GLint index = (GLint) ((GLfloat*) image->Data)[pixel];
+                     /* apply index shift and offset */
+                     if (shift>=0) {
+                        index = (index << shift) + offset;
+                     }
+                     else {
+                        index = (index >> -shift) + offset;
+                     }
+                     /* convert index to RGBA */
+                     red   = ctx->Pixel.MapItoR[index & rMask];
+                     green = ctx->Pixel.MapItoG[index & gMask];
+                     blue  = ctx->Pixel.MapItoB[index & bMask];
+                     alpha = ctx->Pixel.MapItoA[index & aMask];
+                  }
+                  break;
+               case GL_RGB:
+                  /* Fetch image RGBA values */
+                  red   = ((GLfloat*) image->Data)[pixel*3+0];
+                  green = ((GLfloat*) image->Data)[pixel*3+1];
+                  blue  = ((GLfloat*) image->Data)[pixel*3+2];
+                  alpha = 1.0;
+                  break;
+               case GL_RGBA:
+                  red   = ((GLfloat*) image->Data)[pixel*4+0];
+                  green = ((GLfloat*) image->Data)[pixel*4+1];
+                  blue  = ((GLfloat*) image->Data)[pixel*4+2];
+                  alpha = ((GLfloat*) image->Data)[pixel*4+3];
+                  break;
+               case GL_RED:
+                  red   = ((GLfloat*) image->Data)[pixel];
+                  green = 0.0;
+                  blue  = 0.0;
+                  alpha = 1.0;
+                  break;
+               case GL_GREEN:
+                  red   = 0.0;
+                  green = ((GLfloat*) image->Data)[pixel];
+                  blue  = 0.0;
+                  alpha = 1.0;
+                  break;
+               case GL_BLUE:
+                  red   = 0.0;
+                  green = 0.0;
+                  blue  = ((GLfloat*) image->Data)[pixel];
+                  alpha = 1.0;
+                  break;
+               case GL_ALPHA:
+                  red   = 0.0;
+                  green = 0.0;
+                  blue  = 0.0;
+                  alpha = ((GLfloat*) image->Data)[pixel];
+                  break;
+               case GL_LUMINANCE: 
+                  red   = ((GLfloat*) image->Data)[pixel];
+                  green = red;
+                  blue  = red;
+                  alpha = 1.0;
+                  break;
+              case GL_LUMINANCE_ALPHA:
+                  red   = ((GLfloat*) image->Data)[pixel*2+0];
+                  green = red;
+                  blue  = red;
+                  alpha = ((GLfloat*) image->Data)[pixel*2+1];
+                  break;
+               default:
+                  gl_problem(ctx,"Bad format (4) in image_to_texture");
+                  return NULL;
+            }
+            
+            if (image->Format!=GL_COLOR_INDEX) {
+               /* Apply RGBA scale and bias */
+               if (scaleOrBias) {
+                  red   = red   * ctx->Pixel.RedScale   + ctx->Pixel.RedBias;
+                  green = green * ctx->Pixel.GreenScale + ctx->Pixel.GreenBias;
+                  blue  = blue  * ctx->Pixel.BlueScale  + ctx->Pixel.BlueBias;
+                  alpha = alpha * ctx->Pixel.AlphaScale + ctx->Pixel.AlphaBias;
+                  red   = CLAMP( red,    0.0F, 1.0F );
+                  green = CLAMP( green,  0.0F, 1.0F );
+                  blue  = CLAMP( blue,   0.0F, 1.0F );
+                  alpha = CLAMP( alpha,  0.0F, 1.0F );
+               }
+               /* Apply pixel maps */
+               if (ctx->Pixel.MapColorFlag) {
+                  GLint ir = (GLint) (red  *ctx->Pixel.MapRtoRsize);
+                  GLint ig = (GLint) (green*ctx->Pixel.MapGtoGsize);
+                  GLint ib = (GLint) (blue *ctx->Pixel.MapBtoBsize);
+                  GLint ia = (GLint) (alpha*ctx->Pixel.MapAtoAsize);
+                  red   = ctx->Pixel.MapRtoR[ir];
+                  green = ctx->Pixel.MapGtoG[ig];
+                  blue  = ctx->Pixel.MapBtoB[ib];
+                  alpha = ctx->Pixel.MapAtoA[ia];
+               }
+            }
+
+            /* store texel (components are GLubytes in [0,255]) */
+            switch (texImage->Format) {
+               case GL_COLOR_INDEX:
+                  /* a paletted texture */
+                  texImage->Data[pixel] = (GLint) (red * 255.0F);
+                  break;
+               case GL_ALPHA:
+                  texImage->Data[pixel] = (GLint) (alpha * 255.0F);
+                  break;
+               case GL_LUMINANCE:
+                  texImage->Data[pixel] = (GLint) (red * 255.0F);
+                  break;
+               case GL_LUMINANCE_ALPHA:
+                  texImage->Data[pixel*2+0] = (GLint) (red * 255.0F);
+                  texImage->Data[pixel*2+1] = (GLint) (alpha * 255.0F);
+                  break;
+               case GL_INTENSITY:
+                  texImage->Data[pixel] = (GLint) (red * 255.0F);
+                  break;
+               case GL_RGB:
+                  texImage->Data[pixel*3+0] = (GLint) (red   * 255.0F);
+                  texImage->Data[pixel*3+1] = (GLint) (green * 255.0F);
+                  texImage->Data[pixel*3+2] = (GLint) (blue  * 255.0F);
+                  break;
+               case GL_RGBA:
+                  texImage->Data[pixel*4+0] = (GLint) (red   * 255.0F);
+                  texImage->Data[pixel*4+1] = (GLint) (green * 255.0F);
+                  texImage->Data[pixel*4+2] = (GLint) (blue  * 255.0F);
+                  texImage->Data[pixel*4+3] = (GLint) (alpha * 255.0F);
+                  break;
+               default:
+                  gl_problem(ctx,"Bad format (5) in image_to_texture");
+                  return NULL;
+            }
+         }
+         break;
+
+      default:
+         gl_problem(ctx, "Bad image type in image_to_texture");
+         return NULL;
+   }
+
+   return texImage;
+}
+
+
+
+/*
+ * glTexImage[123]D can accept a NULL image pointer.  In this case we
+ * create a texture image with unspecified image contents per the OpenGL
+ * spec.
+ */
+static struct gl_texture_image *
+make_null_texture( GLcontext *ctx, GLenum internalFormat,
+                   GLsizei width, GLsizei height, GLsizei depth, GLint border )
+{
+   GLint components;
+   struct gl_texture_image *texImage;
+   GLint numPixels;
+   (void) ctx;
+
+   /*internalFormat = decode_internal_format(internalFormat);*/
+   components = components_in_intformat(internalFormat);
+   numPixels = width * height * depth;
+
+   texImage = gl_alloc_texture_image();
+   if (!texImage)
+      return NULL;
+
+   texImage->Format = (GLenum) decode_internal_format(internalFormat);
+   set_teximage_component_sizes( texImage );
+   texImage->IntFormat = internalFormat;
+   texImage->Border = border;
+   texImage->Width = width;
+   texImage->Height = height;
+   texImage->Depth = depth;
+   texImage->WidthLog2 = logbase2(width - 2*border);
+   if (height==1)  /* 1-D texture */
+      texImage->HeightLog2 = 0;
+   else
+      texImage->HeightLog2 = logbase2(height - 2*border);
+   if (depth==1)   /* 2-D texture */
+      texImage->DepthLog2 = 0;
+   else
+      texImage->DepthLog2 = logbase2(depth - 2*border);
+   texImage->Width2 = 1 << texImage->WidthLog2;
+   texImage->Height2 = 1 << texImage->HeightLog2;
+   texImage->Depth2 = 1 << texImage->DepthLog2;
+   texImage->MaxLog2 = MAX2( texImage->WidthLog2, texImage->HeightLog2 );
+
+   /* XXX should we really allocate memory for the image or let it be NULL? */
+   /*texImage->Data = NULL;*/
+
+   texImage->Data = (GLubyte *) malloc( numPixels * components + EXTRA_BYTE );
+
+   /*
+    * Let's see if anyone finds this.  If glTexImage2D() is called with
+    * a NULL image pointer then load the texture image with something
+    * interesting instead of leaving it indeterminate.
+    */
+   if (texImage->Data) {
+      char message[8][32] = {
+         "   X   X  XXXXX   XXX     X    ",
+         "   XX XX  X      X   X   X X   ",
+         "   X X X  X      X      X   X  ",
+         "   X   X  XXXX    XXX   XXXXX  ",
+         "   X   X  X          X  X   X  ",
+         "   X   X  X      X   X  X   X  ",
+         "   X   X  XXXXX   XXX   X   X  ",
+         "                               "
+      };
+
+      GLubyte *imgPtr = texImage->Data;
+      GLint i, j, k;
+      for (i=0;i<height;i++) {
+         GLint srcRow = 7 - i % 8;
+         for (j=0;j<width;j++) {
+            GLint srcCol = j % 32;
+            GLubyte texel = (message[srcRow][srcCol]=='X') ? 255 : 70;
+            for (k=0;k<components;k++) {
+               *imgPtr++ = texel;
+            }
+         }
+      }
+   }
+
+   return texImage;
+}
+
+
+
+/*
+ * Test glTexImage() parameters for errors.
+ * Input:
+ *         dimensions - must be 1 or 2 or 3
+ * Return:  GL_TRUE = an error was detected, GL_FALSE = no errors
+ */
+static GLboolean texture_error_check( GLcontext *ctx, GLenum target,
+                                      GLint level, GLint internalFormat,
+                                      GLenum format, GLenum type,
+                                      GLint dimensions,
+                                      GLint width, GLint height,
+                                      GLint depth, GLint border )
+{
+   GLboolean isProxy;
+   GLint iformat;
+
+   if (dimensions == 1) {
+      isProxy = (target == GL_PROXY_TEXTURE_1D);
+      if (target != GL_TEXTURE_1D && !isProxy) {
+         gl_error( ctx, GL_INVALID_ENUM, "glTexImage1D(target)" );
+         return GL_TRUE;
+      }
+   }
+   else if (dimensions == 2) {
+      isProxy = (target == GL_PROXY_TEXTURE_2D);
+      if (target != GL_TEXTURE_2D && !isProxy) {
+          gl_error( ctx, GL_INVALID_ENUM, "glTexImage2D(target)" );
+          return GL_TRUE;
+      }
+   }
+   else if (dimensions == 3) {
+      isProxy = (target == GL_PROXY_TEXTURE_3D);
+      if (target != GL_TEXTURE_3D && !isProxy) {
+         gl_error( ctx, GL_INVALID_ENUM, "glTexImage3D(target)" );
+         return GL_TRUE;
+      }
+   }
+   else {
+      gl_problem( ctx, "bad dims in texture_error_check" );
+      return GL_TRUE;
+   }
+
+   /* Border */
+   if (border!=0 && border!=1) {
+      if (!isProxy) {
+         if (dimensions == 1)
+            gl_error( ctx, GL_INVALID_VALUE, "glTexImage1D(border)" );
+         else if (dimensions == 2)
+            gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(border)" );
+         else if (dimensions == 3)
+            gl_error( ctx, GL_INVALID_VALUE, "glTexImage3D(border)" );
+      }
+      return GL_TRUE;
+   }
+
+   /* Width */
+   if (width < 2 * border || width > 2 + ctx->Const.MaxTextureSize
+       || logbase2( width - 2 * border ) < 0) {
+      if (!isProxy) {
+         if (dimensions == 1)
+            gl_error( ctx, GL_INVALID_VALUE, "glTexImage1D(width)" );
+         else if (dimensions == 2)
+            gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(width)" );
+         else if (dimensions == 3)
+            gl_error( ctx, GL_INVALID_VALUE, "glTexImage3D(width)" );
+      }
+      return GL_TRUE;
+   }
+
+   /* Height */
+   if (dimensions >= 2) {
+      if (height < 2 * border || height > 2 + ctx->Const.MaxTextureSize
+          || logbase2( height - 2 * border ) < 0) {
+         if (!isProxy) {
+            if (dimensions == 2)
+               gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(height)" );
+            else if (dimensions == 3)
+               gl_error( ctx, GL_INVALID_VALUE, "glTexImage3D(height)" );
+            return GL_TRUE;
+         }
+      }
+   }
+
+   /* Depth */
+   if (dimensions >= 3) {
+      if (depth < 2 * border || depth > 2 + ctx->Const.MaxTextureSize
+          || logbase2( depth - 2 * border ) < 0) {
+         if (!isProxy) {
+            gl_error( ctx, GL_INVALID_VALUE, "glTexImage3D(depth)" );
+         }
+         return GL_TRUE;
+      }
+   }
+
+   /* Level */
+   if (level<0 || level>=ctx->Const.MaxTextureLevels) {
+      if (dimensions == 1)
+         gl_error( ctx, GL_INVALID_VALUE, "glTexImage1D(level)" );
+      else if (dimensions == 2)
+         gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(level)" );
+      else if (dimensions == 3)
+         gl_error( ctx, GL_INVALID_VALUE, "glTexImage3D(level)" );
+      return GL_TRUE;
+   }
+
+   iformat = decode_internal_format( internalFormat );
+   if (iformat < 0) {
+      if (dimensions == 1)
+         gl_error( ctx, GL_INVALID_VALUE, "glTexImage1D(internalFormat)" );
+      else if (dimensions == 2)
+         gl_error( ctx, GL_INVALID_VALUE, "glTexImage2D(internalFormat)" );
+      else if (dimensions == 3)
+         gl_error( ctx, GL_INVALID_VALUE, "glTexImage3D(internalFormat)" );
+      return GL_TRUE;
+   }
+
+   if (!gl_is_legal_format_and_type( format, type )) {
+      if (dimensions == 1)
+         gl_error( ctx, GL_INVALID_ENUM, "glTexImage1D(format or type)");
+      else if (dimensions == 2)
+         gl_error( ctx, GL_INVALID_ENUM, "glTexImage2D(format or type)");
+      else if (dimensions == 3)
+         gl_error( ctx, GL_INVALID_ENUM, "glTexImage3D(format or type)");
+      return GL_TRUE;
+   }
+
+   /* if we get here, the parameters are OK */
+   return GL_FALSE;
+}
+
+
+
+/*
+ * Called from the API.  Note that width includes the border.
+ */
+void gl_TexImage1D( GLcontext *ctx,
+                    GLenum target, GLint level, GLint internalformat,
+		    GLsizei width, GLint border, GLenum format,
+		    GLenum type, struct gl_image *image )
+{
+   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glTexImage1D");
+
+   if (target==GL_TEXTURE_1D) {
+      struct gl_texture_image *teximage;
+      if (texture_error_check( ctx, target, level, internalformat,
+                               format, type, 1, width, 1, 1, border )) {
+         /* error in texture image was detected */
+         return;
+      }
+
+      /* free current texture image, if any */
+      if (texUnit->CurrentD[1]->Image[level]) {
+         gl_free_texture_image( texUnit->CurrentD[1]->Image[level] );
+      }
+
+      /* make new texture from source image */
+      if (image) {
+         teximage = image_to_texture(ctx, image, internalformat, border);
+      }
+      else {
+         teximage = make_null_texture(ctx, (GLenum) internalformat,
+                                      width, 1, 1, border);
+      }
+
+      /* install new texture image */
+
+      texUnit->CurrentD[1]->Image[level] = teximage;
+      gl_put_texobj_on_dirty_list( ctx, texUnit->CurrentD[1] );
+      ctx->NewState |= NEW_TEXTURING;
+
+      /* free the source image */
+      if (image && image->RefCount==0) {
+         /* if RefCount>0 then image must be in a display list */
+         gl_free_image(image);
+      }
+
+      /* tell driver about change */
+      if (ctx->Driver.TexImage) {
+         (*ctx->Driver.TexImage)( ctx, GL_TEXTURE_1D,
+                                  texUnit->CurrentD[1],
+                                  level, internalformat, teximage );
+      }
+   }
+   else if (target==GL_PROXY_TEXTURE_1D) {
+      /* Proxy texture: check for errors and update proxy state */
+      if (texture_error_check( ctx, target, level, internalformat,
+                               format, type, 1, width, 1, 1, border )) {
+         if (level>=0 && level<ctx->Const.MaxTextureLevels) {
+            MEMSET( ctx->Texture.Proxy1D->Image[level], 0,
+                    sizeof(struct gl_texture_image) );
+         }
+      }
+      else {
+         ctx->Texture.Proxy1D->Image[level]->Format = (GLenum) format;
+         set_teximage_component_sizes( ctx->Texture.Proxy1D->Image[level] );
+         ctx->Texture.Proxy1D->Image[level]->IntFormat = (GLenum) internalformat;
+         ctx->Texture.Proxy1D->Image[level]->Border = border;
+         ctx->Texture.Proxy1D->Image[level]->Width = width;
+         ctx->Texture.Proxy1D->Image[level]->Height = 1;
+         ctx->Texture.Proxy1D->Image[level]->Depth = 1;
+      }
+      if (image && image->RefCount==0) {
+         /* if RefCount>0 then image must be in a display list */
+         gl_free_image(image);
+      }
+   }
+   else {
+      gl_error( ctx, GL_INVALID_ENUM, "glTexImage1D(target)" );
+      return;
+   }
+}
+
+
+
+
+/*
+ * Called by the API or display list executor.
+ * Note that width and height include the border.
+ */
+void gl_TexImage2D( GLcontext *ctx,
+                    GLenum target, GLint level, GLint internalformat,
+                    GLsizei width, GLsizei height, GLint border,
+                    GLenum format, GLenum type,
+                    struct gl_image *image )
+{
+   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glTexImage2D");
+
+   if (target==GL_TEXTURE_2D) {
+      struct gl_texture_image *teximage;
+      if (texture_error_check( ctx, target, level, internalformat,
+                               format, type, 2, width, height, 1, border )) {
+         /* error in texture image was detected */
+         return;
+      }
+
+      /* free current texture image, if any */
+      if (texUnit->CurrentD[2]->Image[level]) {
+         gl_free_texture_image( texUnit->CurrentD[2]->Image[level] );
+      }
+
+      /* make new texture from source image */
+      if (image) {
+         teximage = image_to_texture(ctx, image, internalformat, border);
+      }
+      else {
+         teximage = make_null_texture(ctx, (GLenum) internalformat,
+                                      width, height, 1, border);
+      }
+
+      /* install new texture image */
+      texUnit->CurrentD[2]->Image[level] = teximage;
+      gl_put_texobj_on_dirty_list( ctx, texUnit->CurrentD[2] );
+      ctx->NewState |= NEW_TEXTURING;
+
+      /* free the source image */
+      if (image && image->RefCount==0) {
+         /* if RefCount>0 then image must be in a display list */
+         gl_free_image(image);
+      }
+
+      /* tell driver about change */
+      if (ctx->Driver.TexImage) {
+         (*ctx->Driver.TexImage)( ctx, GL_TEXTURE_2D,
+                                  texUnit->CurrentD[2],
+                                  level, internalformat, teximage );
+      }
+   }
+   else if (target==GL_PROXY_TEXTURE_2D) {
+      /* Proxy texture: check for errors and update proxy state */
+      if (texture_error_check( ctx, target, level, internalformat,
+                               format, type, 2, width, height, 1, border )) {
+         if (level>=0 && level<ctx->Const.MaxTextureLevels) {
+            MEMSET( ctx->Texture.Proxy2D->Image[level], 0,
+                    sizeof(struct gl_texture_image) );
+         }
+      }
+      else {
+         ctx->Texture.Proxy2D->Image[level]->Format = (GLenum) format;
+         set_teximage_component_sizes( ctx->Texture.Proxy2D->Image[level] );
+         ctx->Texture.Proxy2D->Image[level]->IntFormat = (GLenum) internalformat;
+         ctx->Texture.Proxy2D->Image[level]->Border = border;
+         ctx->Texture.Proxy2D->Image[level]->Width = width;
+         ctx->Texture.Proxy2D->Image[level]->Height = height;
+         ctx->Texture.Proxy2D->Image[level]->Depth = 1;
+      }
+      if (image && image->RefCount==0) {
+         /* if RefCount>0 then image must be in a display list */
+         gl_free_image(image);
+      }
+   }
+   else {
+      gl_error( ctx, GL_INVALID_ENUM, "glTexImage2D(target)" );
+      return;
+   }
+}
+
+
+
+/*
+ * Called by the API or display list executor.
+ * Note that width and height include the border.
+ */
+void gl_TexImage3DEXT( GLcontext *ctx,
+                       GLenum target, GLint level, GLint internalformat,
+                       GLsizei width, GLsizei height, GLsizei depth,
+                       GLint border, GLenum format, GLenum type,
+                       struct gl_image *image )
+{
+   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glTexImage3DEXT");
+
+   if (target==GL_TEXTURE_3D_EXT) {
+      struct gl_texture_image *teximage;
+      if (texture_error_check( ctx, target, level, internalformat,
+                               format, type, 3, width, height, depth,
+                               border )) {
+         /* error in texture image was detected */
+         return;
+      }
+
+      /* free current texture image, if any */
+      if (texUnit->CurrentD[3]->Image[level]) {
+         gl_free_texture_image( texUnit->CurrentD[3]->Image[level] );
+      }
+
+      /* make new texture from source image */
+      if (image) {
+         teximage = image_to_texture(ctx, image, internalformat, border);
+      }
+      else {
+         teximage = make_null_texture(ctx, (GLenum) internalformat,
+                                      width, height, depth, border);
+      }
+
+      /* install new texture image */
+      texUnit->CurrentD[3]->Image[level] = teximage;
+      gl_put_texobj_on_dirty_list( ctx, texUnit->CurrentD[3] );
+      ctx->NewState |= NEW_TEXTURING;
+
+      /* free the source image */
+      if (image && image->RefCount==0) {
+         /* if RefCount>0 then image must be in a display list */
+         gl_free_image(image);
+      }
+
+      /* tell driver about change */
+      if (ctx->Driver.TexImage) {
+         (*ctx->Driver.TexImage)( ctx, GL_TEXTURE_3D_EXT,
+                                  texUnit->CurrentD[3],
+                                  level, internalformat, teximage );
+      }
+   }
+   else if (target==GL_PROXY_TEXTURE_3D_EXT) {
+      /* Proxy texture: check for errors and update proxy state */
+      if (texture_error_check( ctx, target, level, internalformat,
+                               format, type, 3, width, height, depth,
+                               border )) {
+         if (level>=0 && level<ctx->Const.MaxTextureLevels) {
+            MEMSET( ctx->Texture.Proxy3D->Image[level], 0,
+                    sizeof(struct gl_texture_image) );
+         }
+      }
+      else {
+         ctx->Texture.Proxy3D->Image[level]->Format = (GLenum) format;
+         set_teximage_component_sizes( ctx->Texture.Proxy3D->Image[level] );
+         ctx->Texture.Proxy3D->Image[level]->IntFormat = (GLenum) internalformat;
+         ctx->Texture.Proxy3D->Image[level]->Border = border;
+         ctx->Texture.Proxy3D->Image[level]->Width = width;
+         ctx->Texture.Proxy3D->Image[level]->Height = height;
+         ctx->Texture.Proxy3D->Image[level]->Depth  = depth;
+      }
+      if (image && image->RefCount==0) {
+         /* if RefCount>0 then image must be in a display list */
+         gl_free_image(image);
+      }
+   }
+   else {
+      gl_error( ctx, GL_INVALID_ENUM, "glTexImage3DEXT(target)" );
+      return;
+   }
+}
+
+
+
+void gl_GetTexImage( GLcontext *ctx, GLenum target, GLint level, GLenum format,
+                     GLenum type, GLvoid *pixels )
+{
+   const struct gl_texture_object *texObj;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glGetTexImage");
+
+   if (level < 0 || level >= ctx->Const.MaxTextureLevels) {
+      gl_error( ctx, GL_INVALID_VALUE, "glGetTexImage(level)" );
+      return;
+   }
+
+   if (gl_sizeof_type(type) <= 0) {
+      gl_error( ctx, GL_INVALID_ENUM, "glGetTexImage(type)" );
+      return;
+   }
+
+   if (gl_components_in_format(format) <= 0) {
+      gl_error( ctx, GL_INVALID_ENUM, "glGetTexImage(format)" );
+      return;
+   }
+
+   if (!pixels)
+      return;  /* XXX generate an error??? */
+
+   switch (target) {
+      case GL_TEXTURE_1D:
+         texObj = ctx->Texture.Unit[ctx->Texture.CurrentUnit].CurrentD[1];
+         break;
+      case GL_TEXTURE_2D:
+         texObj = ctx->Texture.Unit[ctx->Texture.CurrentUnit].CurrentD[2];
+         break;
+      case GL_TEXTURE_3D:
+         texObj = ctx->Texture.Unit[ctx->Texture.CurrentUnit].CurrentD[3];
+         break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glGetTexImage(target)" );
+         return;
+   }
+
+   if (texObj->Image[level] && texObj->Image[level]->Data) {
+      const struct gl_texture_image *texImage = texObj->Image[level];
+      GLint width = texImage->Width;
+      GLint height = texImage->Height;
+      GLint row;
+
+      for (row = 0; row < height; row++) {
+         /* compute destination address in client memory */
+         GLvoid *dest = gl_pixel_addr_in_image( &ctx->Unpack, pixels,
+                                                width, height,
+                                                format, type, 0, row, 0);
+
+         assert(dest);
+         if (texImage->Format == GL_RGBA) {
+            const GLubyte *src = texImage->Data + row * width * 4 * sizeof(GLubyte);
+            gl_pack_rgba_span( ctx, width, (void *) src, format, type, dest,
+                               &ctx->Pack, GL_TRUE );
+         }
+         else {
+            /* fetch RGBA row from texture image then pack it in client mem */
+            GLubyte rgba[MAX_WIDTH][4];
+            GLint i;
+            const GLubyte *src;
+            switch (texImage->Format) {
+               case GL_ALPHA:
+                  src = texImage->Data + row * width * sizeof(GLubyte);
+                  for (i = 0; i < width; i++) {
+                     rgba[i][RCOMP] = 255;
+                     rgba[i][GCOMP] = 255;
+                     rgba[i][BCOMP] = 255;
+                     rgba[i][ACOMP] = src[i];
+                  }
+                  break;
+               case GL_LUMINANCE:
+                  src = texImage->Data + row * width * sizeof(GLubyte);
+                  for (i = 0; i < width; i++) {
+                     rgba[i][RCOMP] = src[i];
+                     rgba[i][GCOMP] = src[i];
+                     rgba[i][BCOMP] = src[i];
+                     rgba[i][ACOMP] = 255;
+                   }
+                  break;
+               case GL_LUMINANCE_ALPHA:
+                  src = texImage->Data + row * 2 * width * sizeof(GLubyte);
+                  for (i = 0; i < width; i++) {
+                     rgba[i][RCOMP] = src[i*2+0];
+                     rgba[i][GCOMP] = src[i*2+0];
+                     rgba[i][BCOMP] = src[i*2+0];
+                     rgba[i][ACOMP] = src[i*2+1];
+                  }
+                  break;
+               case GL_INTENSITY:
+                  src = texImage->Data + row * width * sizeof(GLubyte);
+                  for (i = 0; i < width; i++) {
+                     rgba[i][RCOMP] = src[i];
+                     rgba[i][GCOMP] = src[i];
+                     rgba[i][BCOMP] = src[i];
+                     rgba[i][ACOMP] = 255;
+                  }
+                  break;
+               case GL_RGB:
+                  src = texImage->Data + row * 3 * width * sizeof(GLubyte);
+                  for (i = 0; i < width; i++) {
+                     rgba[i][RCOMP] = src[i*3+0];
+                     rgba[i][GCOMP] = src[i*3+1];
+                     rgba[i][BCOMP] = src[i*3+2];
+                     rgba[i][ACOMP] = 255;
+                  }
+                  break;
+               case GL_RGBA:
+                  /* this special case should have been handled above! */
+                  gl_problem( ctx, "error 1 in gl_GetTexImage" );
+                  break;
+               case GL_COLOR_INDEX:
+                  gl_problem( ctx, "GL_COLOR_INDEX not implemented in gl_GetTexImage" );
+                  break;
+               default:
+                  gl_problem( ctx, "bad format in gl_GetTexImage" );
+            }
+            gl_pack_rgba_span( ctx, width, (const GLubyte (*)[4])rgba,
+                               format, type, dest, &ctx->Pack, GL_TRUE );
+         }
+      }
+   }
+}
+
+
+
+/*
+ * Unpack the image data given to glTexSubImage[12]D.
+ * This function is just a wrapper for gl_unpack_image() but it does
+ * some extra error checking.
+ */
+struct gl_image *
+gl_unpack_texsubimage( GLcontext *ctx, GLint width, GLint height,
+                       GLenum format, GLenum type, const GLvoid *pixels )
+{
+   if (type==GL_BITMAP && format!=GL_COLOR_INDEX) {
+      return NULL;
+   }
+
+   if (format==GL_STENCIL_INDEX || format==GL_DEPTH_COMPONENT){
+      return NULL;
+   }
+
+   if (gl_sizeof_type(type)<=0) {
+      return NULL;
+   }
+
+   return gl_unpack_image3D( ctx, width, height, 1, format, type, pixels, &ctx->Unpack );
+}
+
+
+/*
+ * Unpack the image data given to glTexSubImage3D.
+ * This function is just a wrapper for gl_unpack_image() but it does
+ * some extra error checking.
+ */
+struct gl_image *
+gl_unpack_texsubimage3D( GLcontext *ctx, GLint width, GLint height,
+                         GLint depth, GLenum format, GLenum type,
+                         const GLvoid *pixels )
+{
+   if (type==GL_BITMAP && format!=GL_COLOR_INDEX) {
+      return NULL;
+   }
+
+   if (format==GL_STENCIL_INDEX || format==GL_DEPTH_COMPONENT){
+      return NULL;
+   }
+
+   if (gl_sizeof_type(type)<=0) {
+      return NULL;
+   }
+
+   return gl_unpack_image3D( ctx, width, height, depth, format, type, pixels,
+                             &ctx->Unpack );
+}
+
+
+
+void gl_TexSubImage1D( GLcontext *ctx,
+                       GLenum target, GLint level, GLint xoffset,
+                       GLsizei width, GLenum format, GLenum type,
+                       struct gl_image *image )
+{
+   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+   struct gl_texture_image *destTex;
+
+   if (target!=GL_TEXTURE_1D) {
+      gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(target)" );
+      return;
+   }
+   if (level<0 || level>=ctx->Const.MaxTextureLevels) {
+      gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(level)" );
+      return;
+   }
+
+   destTex = texUnit->CurrentD[1]->Image[level];
+   if (!destTex) {
+      gl_error( ctx, GL_INVALID_OPERATION, "glTexSubImage1D" );
+      return;
+   }
+
+   if (xoffset < -((GLint)destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage1D(xoffset)" );
+      return;
+   }
+   if (xoffset + width > (GLint) (destTex->Width + destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage1D(xoffset+width)" );
+      return;
+   }
+
+   if (image) {
+      /* unpacking must have been error-free */
+      GLint texcomponents = components_in_intformat(destTex->Format);
+
+      if (image->Type==GL_UNSIGNED_BYTE && texcomponents==image->Components) {
+         /* Simple case, just byte copy image data into texture image */
+         /* row by row. */
+         GLubyte *dst = destTex->Data + texcomponents * xoffset;
+         GLubyte *src = (GLubyte *) image->Data;
+         MEMCPY( dst, src, width * texcomponents );
+      }
+      else {
+         /* General case, convert image pixels into texels, scale, bias, etc */
+         struct gl_texture_image *subTexImg = image_to_texture(ctx, image,
+                                        destTex->IntFormat, destTex->Border);
+         GLubyte *dst = destTex->Data + texcomponents * xoffset;
+         GLubyte *src = subTexImg->Data;
+         MEMCPY( dst, src, width * texcomponents );
+         gl_free_texture_image(subTexImg);
+      }
+
+      /* if the image's reference count is zero, delete it now */
+      if (image->RefCount==0) {
+         gl_free_image(image);
+      }
+
+      gl_put_texobj_on_dirty_list( ctx, texUnit->CurrentD[1] );
+
+      /* tell driver about change */
+      if (ctx->Driver.TexSubImage) {
+	(*ctx->Driver.TexSubImage)( ctx, GL_TEXTURE_1D,
+				    texUnit->CurrentD[1], level,
+				    xoffset,0,width,1,
+				    texUnit->CurrentD[1]->Image[level]->IntFormat,
+				    destTex );
+      }
+      else {
+	if (ctx->Driver.TexImage) {
+	  (*ctx->Driver.TexImage)( ctx, GL_TEXTURE_1D, texUnit->CurrentD[1], level,
+				   texUnit->CurrentD[1]->Image[level]->IntFormat,
+				   destTex );
+	}
+      }
+   }
+   else {
+      /* if no image, an error must have occured, do more testing now */
+      GLint components, size;
+
+      if (width<0) {
+         gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage1D(width)" );
+         return;
+      }
+      if (type==GL_BITMAP && format!=GL_COLOR_INDEX) {
+         gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(format)" );
+         return;
+      }
+      components = components_in_intformat( format );
+      if (components<0 || format==GL_STENCIL_INDEX
+          || format==GL_DEPTH_COMPONENT){
+         gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(format)" );
+         return;
+      }
+      size = gl_sizeof_type( type );
+      if (size<=0) {
+         gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(type)" );
+         return;
+      }
+      /* if we get here, probably ran out of memory during unpacking */
+      gl_error( ctx, GL_OUT_OF_MEMORY, "glTexSubImage1D" );
+   }
+}
+
+
+
+void gl_TexSubImage2D( GLcontext *ctx,
+                       GLenum target, GLint level,
+                       GLint xoffset, GLint yoffset,
+                       GLsizei width, GLsizei height,
+                       GLenum format, GLenum type,
+                       struct gl_image *image )
+{
+   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+   struct gl_texture_image *destTex;
+
+   if (target!=GL_TEXTURE_2D) {
+      gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage2D(target)" );
+      return;
+   }
+   if (level<0 || level>=ctx->Const.MaxTextureLevels) {
+      gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage2D(level)" );
+      return;
+   }
+
+   destTex = texUnit->CurrentD[2]->Image[level];
+   if (!destTex) {
+      gl_error( ctx, GL_INVALID_OPERATION, "glTexSubImage2D" );
+      return;
+   }
+
+   if (xoffset < -((GLint)destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(xoffset)" );
+      return;
+   }
+   if (yoffset < -((GLint)destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(yoffset)" );
+      return;
+   }
+   if (xoffset + width > (GLint) (destTex->Width + destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(xoffset+width)" );
+      return;
+   }
+   if (yoffset + height > (GLint) (destTex->Height + destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(yoffset+height)" );
+      return;
+   }
+
+   if (image) {
+      /* unpacking must have been error-free */
+      GLint texcomponents = components_in_intformat(destTex->Format);
+
+      if (image->Type==GL_UNSIGNED_BYTE && texcomponents==image->Components) {
+         /* Simple case, just byte copy image data into texture image */
+         /* row by row. */
+         GLubyte *dst = destTex->Data 
+                      + (yoffset * destTex->Width + xoffset) * texcomponents;
+         GLubyte *src = (GLubyte *) image->Data;
+         GLint  j;
+         for (j=0;j<height;j++) {
+            MEMCPY( dst, src, width * texcomponents );
+            dst += destTex->Width * texcomponents * sizeof(GLubyte);
+            src += width * texcomponents * sizeof(GLubyte);
+         }
+      }
+      else {
+         /* General case, convert image pixels into texels, scale, bias, etc */
+         struct gl_texture_image *subTexImg = image_to_texture(ctx, image,
+                                        destTex->IntFormat, destTex->Border);
+         GLubyte *dst = destTex->Data
+                  + (yoffset * destTex->Width + xoffset) * texcomponents;
+         GLubyte *src = subTexImg->Data;
+         GLint j;
+         for (j=0;j<height;j++) {
+            MEMCPY( dst, src, width * texcomponents );
+            dst += destTex->Width * texcomponents * sizeof(GLubyte);
+            src += width * texcomponents * sizeof(GLubyte);
+         }
+         gl_free_texture_image(subTexImg);
+      }
+
+      /* if the image's reference count is zero, delete it now */
+      if (image->RefCount==0) {
+         gl_free_image(image);
+      }
+
+      gl_put_texobj_on_dirty_list( ctx, texUnit->CurrentD[2] );
+
+      /* tell driver about change */
+      if (ctx->Driver.TexSubImage) {
+	(*ctx->Driver.TexSubImage)( ctx, GL_TEXTURE_2D, texUnit->CurrentD[2], level,
+				    xoffset, yoffset, width, height,
+				    texUnit->CurrentD[2]->Image[level]->IntFormat,
+				    destTex );
+      }
+      else {
+	if (ctx->Driver.TexImage) {
+	  (*ctx->Driver.TexImage)( ctx, GL_TEXTURE_2D, texUnit->CurrentD[2], level,
+				   texUnit->CurrentD[2]->Image[level]->IntFormat,
+				   destTex );
+	}
+      }
+   }
+   else {
+      /* if no image, an error must have occured, do more testing now */
+      GLint components, size;
+
+      if (width<0) {
+         gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(width)" );
+         return;
+      }
+      if (height<0) {
+         gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage2D(height)" );
+         return;
+      }
+      if (type==GL_BITMAP && format!=GL_COLOR_INDEX) {
+         gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage1D(format)" );
+         return;
+      }
+      components = gl_components_in_format( format );
+      if (components<0 || format==GL_STENCIL_INDEX
+          || format==GL_DEPTH_COMPONENT){
+         gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage2D(format)" );
+         return;
+      }
+      size = gl_sizeof_packed_type( type );
+      if (size<=0) {
+         gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage2D(type)" );
+         return;
+      }
+      /* if we get here, probably ran out of memory during unpacking */
+      gl_error( ctx, GL_OUT_OF_MEMORY, "glTexSubImage2D" );
+   }
+}
+
+
+
+void gl_TexSubImage3DEXT( GLcontext *ctx,
+                          GLenum target, GLint level,
+                          GLint xoffset, GLint yoffset, GLint zoffset,
+                          GLsizei width, GLsizei height, GLsizei depth,
+                          GLenum format, GLenum type,
+                          struct gl_image *image )
+{
+   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+   struct gl_texture_image *destTex;
+
+   if (target!=GL_TEXTURE_3D_EXT) {
+      gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage3DEXT(target)" );
+      return;
+   }
+   if (level<0 || level>=ctx->Const.MaxTextureLevels) {
+      gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage3DEXT(level)" );
+      return;
+   }
+
+   destTex = texUnit->CurrentD[3]->Image[level];
+   if (!destTex) {
+      gl_error( ctx, GL_INVALID_OPERATION, "glTexSubImage3DEXT" );
+      return;
+   }
+
+   if (xoffset < -((GLint)destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage3DEXT(xoffset)" );
+      return;
+   }
+   if (yoffset < -((GLint)destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage3DEXT(yoffset)" );
+      return;
+   }
+   if (zoffset < -((GLint)destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage3DEXT(zoffset)" );
+      return;
+   }
+   if (xoffset + width > (GLint) (destTex->Width+destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage3DEXT(xoffset+width)" );
+      return;
+   }
+   if (yoffset + height > (GLint) (destTex->Height+destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage3DEXT(yoffset+height)" );
+      return;
+   }
+   if (zoffset + depth  > (GLint) (destTex->Depth+destTex->Border)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage3DEXT(zoffset+depth)" );
+      return;
+   }
+
+   if (image) {
+      /* unpacking must have been error-free */
+      GLint texcomponents = components_in_intformat(destTex->Format);
+      GLint dstRectArea = destTex->Width * destTex->Height;
+      GLint srcRectArea = width * height;
+
+      if (image->Type==GL_UNSIGNED_BYTE && texcomponents==image->Components) {
+         /* Simple case, just byte copy image data into texture image */
+         /* row by row. */
+         GLubyte *dst = destTex->Data 
+               + (zoffset * dstRectArea +  yoffset * destTex->Width + xoffset)
+               * texcomponents;
+         GLubyte *src = (GLubyte *) image->Data;
+         GLint j, k;
+         for(k=0;k<depth; k++) {
+           for (j=0;j<height;j++) {
+              MEMCPY( dst, src, width * texcomponents );
+              dst += destTex->Width * texcomponents;
+              src += width * texcomponents;
+           }
+           dst += dstRectArea * texcomponents * sizeof(GLubyte);
+           src += srcRectArea * texcomponents * sizeof(GLubyte);
+         }
+      }
+      else {
+         /* General case, convert image pixels into texels, scale, bias, etc */
+         struct gl_texture_image *subTexImg = image_to_texture(ctx, image,
+                                        destTex->IntFormat, destTex->Border);
+         GLubyte *dst = destTex->Data 
+               + (zoffset * dstRectArea +  yoffset * destTex->Width + xoffset)
+               * texcomponents;
+         GLubyte *src = subTexImg->Data;
+         GLint j, k;
+         for(k=0;k<depth; k++) {
+           for (j=0;j<height;j++) {
+              MEMCPY( dst, src, width * texcomponents );
+              dst += destTex->Width * texcomponents;
+              src += width * texcomponents;
+           }
+           dst += dstRectArea * texcomponents * sizeof(GLubyte);
+           src += srcRectArea * texcomponents * sizeof(GLubyte);
+         }
+         gl_free_texture_image(subTexImg);
+      }
+      /* if the image's reference count is zero, delete it now */
+      if (image->RefCount==0) {
+         gl_free_image(image);
+      }
+
+      gl_put_texobj_on_dirty_list( ctx, texUnit->CurrentD[3] );
+
+      /* tell driver about change */
+      if (ctx->Driver.TexImage) {
+         (*ctx->Driver.TexImage)( ctx, GL_TEXTURE_3D_EXT, texUnit->CurrentD[3],
+                                  level, texUnit->CurrentD[3]->Image[level]->IntFormat,
+				  destTex );
+      }
+   }
+   else {
+      /* if no image, an error must have occured, do more testing now */
+      GLint components, size;
+
+      if (width<0) {
+         gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage3DEXT(width)" );
+         return;
+      }
+      if (height<0) {
+         gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage3DEXT(height)" );
+         return;
+      }
+      if (depth<0) {
+         gl_error( ctx, GL_INVALID_VALUE, "glTexSubImage3DEXT(depth)" );
+         return;
+      }
+      if (type==GL_BITMAP && format!=GL_COLOR_INDEX) {
+         gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage3DEXT(format)" );
+         return;
+      }
+      components = components_in_intformat( format );
+      if (components<0 || format==GL_STENCIL_INDEX
+          || format==GL_DEPTH_COMPONENT){
+         gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage3DEXT(format)" );
+         return;
+      }
+      size = gl_sizeof_type( type );
+      if (size<=0) {
+         gl_error( ctx, GL_INVALID_ENUM, "glTexSubImage3DEXT(type)" );
+         return;
+      }
+      /* if we get here, probably ran out of memory during unpacking */
+      gl_error( ctx, GL_OUT_OF_MEMORY, "glTexSubImage3DEXT" );
+   }
+}
+
+
+
+/*
+ * Read an RGBA image from the frame buffer.
+ * Input:  ctx - the context
+ *         x, y - lower left corner
+ *         width, height - size of region to read
+ *         format - one of GL_RED, GL_RGB, GL_LUMINANCE, etc.
+ * Return: gl_image pointer or NULL if out of memory
+ */
+static struct gl_image *read_color_image( GLcontext *ctx, GLint x, GLint y,
+                                          GLsizei width, GLsizei height,
+                                          GLenum format )
+{
+   struct gl_image *image;
+   GLubyte *imgptr;
+   GLint components;
+   GLint i, j;
+
+   components = components_in_intformat( format );
+
+   /*
+    * Allocate image struct and image data buffer
+    */
+   image = (struct gl_image *) malloc( sizeof(struct gl_image) );
+   if (image) {
+      image->Width = width;
+      image->Height = height;
+      image->Depth = 1;
+      image->Components = components;
+      image->Format = format;
+      image->Type = GL_UNSIGNED_BYTE;
+      image->RefCount = 0;
+      image->Data = (GLubyte *) malloc( width * height * components );
+      if (!image->Data) {
+         free(image);
+         return NULL;
+      }
+   }
+   else {
+      return NULL;
+   }
+
+   imgptr = (GLubyte *) image->Data;
+
+   /* Select buffer to read from */
+   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+
+   for (j=0;j<height;j++) {
+      GLubyte rgba[MAX_WIDTH][4];
+      gl_read_rgba_span( ctx, width, x, y+j, rgba );
+
+      switch (format) {
+         case GL_ALPHA:
+            for (i=0;i<width;i++) {
+               *imgptr++ = rgba[i][ACOMP];
+            }
+            break;
+         case GL_LUMINANCE:
+            for (i=0;i<width;i++) {
+               *imgptr++ = rgba[i][RCOMP];
+            }
+            break;
+         case GL_LUMINANCE_ALPHA:
+            for (i=0;i<width;i++) {
+               *imgptr++ = rgba[i][RCOMP];
+               *imgptr++ = rgba[i][ACOMP];
+            }
+            break;
+         case GL_INTENSITY:
+            for (i=0;i<width;i++) {
+               *imgptr++ = rgba[i][RCOMP];
+            }
+            break;
+         case GL_RGB:
+            for (i=0;i<width;i++) {
+               *imgptr++ = rgba[i][RCOMP];
+               *imgptr++ = rgba[i][GCOMP];
+               *imgptr++ = rgba[i][BCOMP];
+            }
+            break;
+         case GL_RGBA:
+            for (i=0;i<width;i++) {
+               *imgptr++ = rgba[i][RCOMP];
+               *imgptr++ = rgba[i][GCOMP];
+               *imgptr++ = rgba[i][BCOMP];
+               *imgptr++ = rgba[i][ACOMP];
+            }
+            break;
+         default:
+            gl_problem(ctx, "Bad format in read_color_image");
+            break;
+      } /*switch*/
+
+   } /*for*/         
+
+   /* Restore drawing buffer */
+   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+
+   return image;
+}
+
+
+
+
+void gl_CopyTexImage1D( GLcontext *ctx,
+                        GLenum target, GLint level,
+                        GLenum internalformat,
+                        GLint x, GLint y,
+                        GLsizei width, GLint border )
+{
+   GLint format;
+   struct gl_image *teximage;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glCopyTexImage1D");
+   if (target!=GL_TEXTURE_1D) {
+      gl_error( ctx, GL_INVALID_ENUM, "glCopyTexImage1D(target)" );
+      return;
+   }
+   if (level<0 || level>=ctx->Const.MaxTextureLevels) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage1D(level)" );
+      return;
+   }
+   if (border!=0 && border!=1) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage1D(border)" );
+      return;
+   }
+   if (width < 2*border || width > 2 + ctx->Const.MaxTextureSize || width<0) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage1D(width)" );
+      return;
+   }
+   format = decode_internal_format( internalformat );
+   if (format<0 || (internalformat>=1 && internalformat<=4)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage1D(format)" );
+      return;
+   }
+
+   teximage = read_color_image( ctx, x, y, width, 1, (GLenum) format );
+   if (!teximage) {
+      gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyTexImage1D" );
+      return;
+   }
+
+   gl_TexImage1D( ctx, target, level, internalformat, width,
+                  border, GL_RGBA, GL_UNSIGNED_BYTE, teximage );
+
+   /* teximage was freed in gl_TexImage1D */
+}
+
+
+
+void gl_CopyTexImage2D( GLcontext *ctx,
+                        GLenum target, GLint level, GLenum internalformat,
+                        GLint x, GLint y, GLsizei width, GLsizei height,
+                        GLint border )
+{
+   GLint format;
+   struct gl_image *teximage;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glCopyTexImage2D");
+   if (target!=GL_TEXTURE_2D) {
+      gl_error( ctx, GL_INVALID_ENUM, "glCopyTexImage2D(target)" );
+      return;
+   }
+   if (level<0 || level>=ctx->Const.MaxTextureLevels) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(level)" );
+      return;
+   }
+   if (border!=0 && border!=1) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(border)" );
+      return;
+   }
+   if (width<2*border || width>2+ctx->Const.MaxTextureSize || width<0) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(width)" );
+      return;
+   }
+   if (height<2*border || height>2+ctx->Const.MaxTextureSize || height<0) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(height)" );
+      return;
+   }
+   format = decode_internal_format( internalformat );
+   if (format<0 || (internalformat>=1 && internalformat<=4)) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexImage2D(format)" );
+      return;
+   }
+
+   teximage = read_color_image( ctx, x, y, width, height, (GLenum) format );
+   if (!teximage) {
+      gl_error( ctx, GL_OUT_OF_MEMORY, "glCopyTexImage2D" );
+      return;
+   }
+
+   gl_TexImage2D( ctx, target, level, internalformat, width, height,
+                  border, GL_RGBA, GL_UNSIGNED_BYTE, teximage );
+
+   /* teximage was freed in gl_TexImage2D */
+}
+
+
+
+
+/*
+ * Do the work of glCopyTexSubImage[123]D.
+ * TODO: apply pixel bias scale and mapping.
+ */
+static void copy_tex_sub_image( GLcontext *ctx, struct gl_texture_image *dest,
+                                GLint width, GLint height,
+                                GLint srcx, GLint srcy,
+                                GLint dstx, GLint dsty, GLint zoffset )
+{
+   GLint i, j;
+   GLint format, components, rectarea;
+   GLint texwidth, texheight; 
+
+   texwidth = dest->Width;
+   texheight = dest->Height;
+   rectarea = texwidth * texheight;
+   zoffset *= rectarea; 
+   format = dest->Format;
+   components = components_in_intformat( format );
+
+   /* Select buffer to read from */
+   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Pixel.DriverReadBuffer );
+
+   for (j=0;j<height;j++) {
+      GLubyte rgba[MAX_WIDTH][4];
+      GLubyte *texptr;
+
+      gl_read_rgba_span( ctx, width, srcx, srcy+j, rgba );
+
+      texptr = dest->Data + ( zoffset + (dsty+j) * texwidth + dstx) * components;
+
+      switch (format) {
+         case GL_ALPHA:
+            for (i=0;i<width;i++) {
+               *texptr++ = rgba[i][ACOMP];
+            }
+            break;
+         case GL_LUMINANCE:
+            for (i=0;i<width;i++) {
+               *texptr++ = rgba[i][RCOMP];
+            }
+            break;
+         case GL_LUMINANCE_ALPHA:
+            for (i=0;i<width;i++) {
+               *texptr++ = rgba[i][RCOMP];
+               *texptr++ = rgba[i][ACOMP];
+            }
+            break;
+         case GL_INTENSITY:
+            for (i=0;i<width;i++) {
+               *texptr++ = rgba[i][RCOMP];
+            }
+            break;
+         case GL_RGB:
+            for (i=0;i<width;i++) {
+               *texptr++ = rgba[i][RCOMP];
+               *texptr++ = rgba[i][GCOMP];
+               *texptr++ = rgba[i][BCOMP];
+            }
+            break;
+         case GL_RGBA:
+            for (i=0;i<width;i++) {
+               *texptr++ = rgba[i][RCOMP];
+               *texptr++ = rgba[i][GCOMP];
+               *texptr++ = rgba[i][BCOMP];
+               *texptr++ = rgba[i][ACOMP];
+            }
+            break;
+      } /*switch*/
+   } /*for*/         
+
+
+   /* Restore drawing buffer */
+   (void) (*ctx->Driver.SetBuffer)( ctx, ctx->Color.DriverDrawBuffer );
+}
+
+
+
+
+void gl_CopyTexSubImage1D( GLcontext *ctx,
+                              GLenum target, GLint level,
+                              GLint xoffset, GLint x, GLint y, GLsizei width )
+{
+   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+   struct gl_texture_image *teximage;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glCopyTexSubImage1D");
+   if (target!=GL_TEXTURE_1D) {
+      gl_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage1D(target)" );
+      return;
+   }
+   if (level<0 || level>=ctx->Const.MaxTextureLevels) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage1D(level)" );
+      return;
+   }
+   if (width<0) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage1D(width)" );
+      return;
+   }
+
+   teximage = texUnit->CurrentD[1]->Image[level];
+
+   if (teximage) {
+      if (xoffset < -((GLint)teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage1D(xoffset)" );
+         return;
+      }
+      /* NOTE: we're adding the border here, not subtracting! */
+      if (xoffset+width > (GLint) (teximage->Width+teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE,
+                   "glCopyTexSubImage1D(xoffset+width)" );
+         return;
+      }
+      if (teximage->Data) {
+         copy_tex_sub_image( ctx, teximage, width, 1, x, y, xoffset, 0, 0 );
+
+	 /* tell driver about change */
+	 if (ctx->Driver.TexSubImage) {
+	   (*ctx->Driver.TexSubImage)( ctx, GL_TEXTURE_1D,
+				       texUnit->CurrentD[1], level,
+				       xoffset,0,width,1,
+				       teximage->IntFormat,
+				       teximage );
+	 }
+	 else {
+	   if (ctx->Driver.TexImage) {
+	     (*ctx->Driver.TexImage)( ctx, GL_TEXTURE_1D, texUnit->CurrentD[1], level,
+				      teximage->IntFormat,
+				      teximage );
+	   }
+	 }
+      }
+   }
+   else {
+      gl_error( ctx, GL_INVALID_OPERATION, "glCopyTexSubImage1D" );
+   }
+}
+
+
+
+void gl_CopyTexSubImage2D( GLcontext *ctx,
+                              GLenum target, GLint level,
+                              GLint xoffset, GLint yoffset,
+                              GLint x, GLint y, GLsizei width, GLsizei height )
+{
+   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+   struct gl_texture_image *teximage;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glCopyTexSubImage2D");
+   if (target!=GL_TEXTURE_2D) {
+      gl_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage2D(target)" );
+      return;
+   }
+   if (level<0 || level>=ctx->Const.MaxTextureLevels) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(level)" );
+      return;
+   }
+   if (width<0) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(width)" );
+      return;
+   }
+   if (height<0) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(height)" );
+      return;
+   }
+
+   teximage = texUnit->CurrentD[2]->Image[level];
+
+   if (teximage) {
+      if (xoffset < -((GLint)teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(xoffset)" );
+         return;
+      }
+      if (yoffset < -((GLint)teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage2D(yoffset)" );
+         return;
+      }
+      /* NOTE: we're adding the border here, not subtracting! */
+      if (xoffset+width > (GLint) (teximage->Width+teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE,
+                   "glCopyTexSubImage2D(xoffset+width)" );
+         return;
+      }
+      if (yoffset+height > (GLint) (teximage->Height+teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE,
+                   "glCopyTexSubImage2D(yoffset+height)" );
+         return;
+      }
+
+      if (teximage->Data) {
+         copy_tex_sub_image( ctx, teximage, width, height,
+                             x, y, xoffset, yoffset, 0 );
+	 /* tell driver about change */
+	 if (ctx->Driver.TexSubImage) {
+	   (*ctx->Driver.TexSubImage)( ctx, GL_TEXTURE_2D, texUnit->CurrentD[2], level,
+				       xoffset, yoffset, width, height,
+				       teximage->IntFormat,
+				       teximage );
+	 }
+	 else {
+	   if (ctx->Driver.TexImage) {
+	     (*ctx->Driver.TexImage)( ctx, GL_TEXTURE_2D, texUnit->CurrentD[2], level,
+				      teximage->IntFormat,
+				      teximage );
+	   }
+	 }
+      }
+   }
+   else {
+      gl_error( ctx, GL_INVALID_OPERATION, "glCopyTexSubImage2D" );
+   }
+}
+
+
+
+void gl_CopyTexSubImage3DEXT( GLcontext *ctx,
+                              GLenum target, GLint level,
+                              GLint xoffset, GLint yoffset, GLint zoffset,
+                              GLint x, GLint y, GLsizei width, GLsizei height )
+{
+   struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
+   struct gl_texture_image *teximage;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glCopyTexSubImage3DEXT");
+   if (target!=GL_TEXTURE_2D) {
+      gl_error( ctx, GL_INVALID_ENUM, "glCopyTexSubImage3DEXT(target)" );
+      return;
+   }
+   if (level<0 || level>=ctx->Const.MaxTextureLevels) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage3DEXT(level)" );
+      return;
+   }
+   if (width<0) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage3DEXT(width)" );
+      return;
+   }
+   if (height<0) {
+      gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage3DEXT(height)" );
+      return;
+   }
+
+   teximage = texUnit->CurrentD[3]->Image[level];
+   if (teximage) {
+      if (xoffset < -((GLint)teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage3DEXT(xoffset)" );
+         return;
+      }
+      if (yoffset < -((GLint)teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage3DEXT(yoffset)" );
+         return;
+      }
+      if (zoffset < -((GLint)teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE, "glCopyTexSubImage3DEXT(zoffset)" );
+         return;
+      }
+      /* NOTE: we're adding the border here, not subtracting! */
+      if (xoffset+width > (GLint) (teximage->Width+teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE,
+                   "glCopyTexSubImage3DEXT(xoffset+width)" );
+         return;
+      }
+      if (yoffset+height > (GLint) (teximage->Height+teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE,
+                   "glCopyTexSubImage3DEXT(yoffset+height)" );
+         return;
+      }
+      if (zoffset > (GLint) (teximage->Depth+teximage->Border)) {
+         gl_error( ctx, GL_INVALID_VALUE,
+                   "glCopyTexSubImage3DEXT(zoffset+depth)" );
+         return;
+      }
+
+      if (teximage->Data) {
+         copy_tex_sub_image( ctx, teximage, width, height, 
+                             x, y, xoffset, yoffset, zoffset);
+
+	 /* tell driver about change */
+	 if (ctx->Driver.TexImage) {
+	   (*ctx->Driver.TexImage)( ctx, GL_TEXTURE_3D_EXT, texUnit->CurrentD[3],
+				    level, teximage->IntFormat,
+				    teximage );
+	 }
+      }
+   }
+   else {
+      gl_error( ctx, GL_INVALID_OPERATION, "glCopyTexSubImage3DEXT" );
+   }
+}
+