Initial revision

1 files changed, 774 insertions, 0 deletions

diff --git a/src/mesa/main/pixel.c b/src/mesa/main/pixel.c
new file mode 100644
index 00000000000..316c357af19
--- /dev/null
+++ b/src/mesa/main/pixel.c
@@ -0,0 +1,774 @@
+/* $Id: pixel.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.
+ */
+
+
+
+
+
+/*
+ * glPixelStore, glPixelTransfer, glPixelMap, glPixelZoom, etc.
+ */
+
+
+#ifdef PC_HEADER
+#include "all.h"
+#else
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include "context.h"
+#include "macros.h"
+#include "pixel.h"
+#include "types.h"
+#ifdef XFree86Server
+#include "GL/xf86glx.h"
+#endif
+#endif
+
+
+
+/**********************************************************************/
+/*****                    glPixelZoom                             *****/
+/**********************************************************************/
+
+
+
+void gl_PixelZoom( GLcontext *ctx, GLfloat xfactor, GLfloat yfactor )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPixelZoom");
+
+   ctx->Pixel.ZoomX = xfactor;
+   ctx->Pixel.ZoomY = yfactor;
+}
+
+
+
+/**********************************************************************/
+/*****                    glPixelStore                            *****/
+/**********************************************************************/
+
+
+void gl_PixelStorei( GLcontext *ctx, GLenum pname, GLint param )
+{
+   /* NOTE: this call can't be compiled into the display list */
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPixelStore");
+
+
+   switch (pname) {
+      case GL_PACK_SWAP_BYTES:
+         ctx->Pack.SwapBytes = param ? GL_TRUE : GL_FALSE;
+	 break;
+      case GL_PACK_LSB_FIRST:
+         ctx->Pack.LsbFirst = param ? GL_TRUE : GL_FALSE;
+	 break;
+      case GL_PACK_ROW_LENGTH:
+	 if (param<0) {
+	    gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
+	 }
+	 else {
+	    ctx->Pack.RowLength = param;
+	 }
+	 break;
+      case GL_PACK_IMAGE_HEIGHT:
+         if (param<0)
+            gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
+         else
+            ctx->Pack.ImageHeight = param;
+         break;
+      case GL_PACK_SKIP_PIXELS:
+	 if (param<0) {
+	    gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
+	 }
+	 else {
+	    ctx->Pack.SkipPixels = param;
+	 }
+	 break;
+      case GL_PACK_SKIP_ROWS:
+	 if (param<0) {
+	    gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
+	 }
+	 else {
+	    ctx->Pack.SkipRows = param;
+	 }
+	 break;
+      case GL_PACK_ALIGNMENT:
+         if (param==1 || param==2 || param==4 || param==8) {
+	    ctx->Pack.Alignment = param;
+	 }
+	 else {
+	    gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
+	 }
+	 break;
+      case GL_UNPACK_SWAP_BYTES:
+	 ctx->Unpack.SwapBytes = param ? GL_TRUE : GL_FALSE;
+         break;
+      case GL_UNPACK_LSB_FIRST:
+	 ctx->Unpack.LsbFirst = param ? GL_TRUE : GL_FALSE;
+	 break;
+      case GL_UNPACK_ROW_LENGTH:
+	 if (param<0) {
+	    gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
+	 }
+	 else {
+	    ctx->Unpack.RowLength = param;
+	 }
+	 break;
+      case GL_UNPACK_IMAGE_HEIGHT:
+         if (param<0)
+            gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
+         else
+            ctx->Unpack.ImageHeight = param;
+         break;
+      case GL_UNPACK_SKIP_PIXELS:
+	 if (param<0) {
+	    gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
+	 }
+	 else {
+	    ctx->Unpack.SkipPixels = param;
+	 }
+	 break;
+      case GL_UNPACK_SKIP_ROWS:
+	 if (param<0) {
+	    gl_error( ctx, GL_INVALID_VALUE, "glPixelStore(param)" );
+	 }
+	 else {
+	    ctx->Unpack.SkipRows = param;
+	 }
+	 break;
+      case GL_UNPACK_ALIGNMENT:
+         if (param==1 || param==2 || param==4 || param==8) {
+	    ctx->Unpack.Alignment = param;
+	 }
+	 else {
+	    gl_error( ctx, GL_INVALID_VALUE, "glPixelStore" );
+	 }
+	 break;
+      default:
+	 gl_error( ctx, GL_INVALID_ENUM, "glPixelStore" );
+   }
+}
+
+
+
+
+
+/**********************************************************************/
+/*****                         glPixelMap                         *****/
+/**********************************************************************/
+
+
+
+void gl_PixelMapfv( GLcontext *ctx,
+                    GLenum map, GLint mapsize, const GLfloat *values )
+{
+   GLint i;
+
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPixelMapfv");
+
+
+   if (mapsize<0 || mapsize>MAX_PIXEL_MAP_TABLE) {
+      gl_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
+      return;
+   }
+
+   if (map>=GL_PIXEL_MAP_S_TO_S && map<=GL_PIXEL_MAP_I_TO_A) {
+      /* test that mapsize is a power of two */
+      GLuint p;
+      GLboolean ok = GL_FALSE;
+      for (p=1; p<=MAX_PIXEL_MAP_TABLE; p=p<<1) {
+	 if ( (p&mapsize) == p ) {
+	    ok = GL_TRUE;
+	    break;
+	 }
+      }
+      if (!ok) {
+	 gl_error( ctx, GL_INVALID_VALUE, "glPixelMapfv(mapsize)" );
+         return;
+      }
+   }
+
+   switch (map) {
+      case GL_PIXEL_MAP_S_TO_S:
+         ctx->Pixel.MapStoSsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+	    ctx->Pixel.MapStoS[i] = (GLint) values[i];
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_I:
+         ctx->Pixel.MapItoIsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+	    ctx->Pixel.MapItoI[i] = (GLint) values[i];
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_R:
+         ctx->Pixel.MapItoRsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+            GLfloat val = CLAMP( values[i], 0.0, 1.0 );
+	    ctx->Pixel.MapItoR[i] = val;
+	    ctx->Pixel.MapItoR8[i] = (GLint) (val * 255.0F);
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_G:
+         ctx->Pixel.MapItoGsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+            GLfloat val = CLAMP( values[i], 0.0, 1.0 );
+	    ctx->Pixel.MapItoG[i] = val;
+	    ctx->Pixel.MapItoG8[i] = (GLint) (val * 255.0F);
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_B:
+         ctx->Pixel.MapItoBsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+            GLfloat val = CLAMP( values[i], 0.0, 1.0 );
+	    ctx->Pixel.MapItoB[i] = val;
+	    ctx->Pixel.MapItoB8[i] = (GLint) (val * 255.0F);
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_A:
+         ctx->Pixel.MapItoAsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+            GLfloat val = CLAMP( values[i], 0.0, 1.0 );
+	    ctx->Pixel.MapItoA[i] = val;
+	    ctx->Pixel.MapItoA8[i] = (GLint) (val * 255.0F);
+	 }
+	 break;
+      case GL_PIXEL_MAP_R_TO_R:
+         ctx->Pixel.MapRtoRsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+	    ctx->Pixel.MapRtoR[i] = CLAMP( values[i], 0.0, 1.0 );
+	 }
+	 break;
+      case GL_PIXEL_MAP_G_TO_G:
+         ctx->Pixel.MapGtoGsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+	    ctx->Pixel.MapGtoG[i] = CLAMP( values[i], 0.0, 1.0 );
+	 }
+	 break;
+      case GL_PIXEL_MAP_B_TO_B:
+         ctx->Pixel.MapBtoBsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+	    ctx->Pixel.MapBtoB[i] = CLAMP( values[i], 0.0, 1.0 );
+	 }
+	 break;
+      case GL_PIXEL_MAP_A_TO_A:
+         ctx->Pixel.MapAtoAsize = mapsize;
+         for (i=0;i<mapsize;i++) {
+	    ctx->Pixel.MapAtoA[i] = CLAMP( values[i], 0.0, 1.0 );
+	 }
+	 break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glPixelMapfv(map)" );
+   }
+}
+
+
+
+
+
+void gl_GetPixelMapfv( GLcontext *ctx, GLenum map, GLfloat *values )
+{
+   GLint i;
+
+   ASSERT_OUTSIDE_BEGIN_END(ctx, "glGetPixelMapfv");
+
+   switch (map) {
+      case GL_PIXEL_MAP_I_TO_I:
+         for (i=0;i<ctx->Pixel.MapItoIsize;i++) {
+	    values[i] = (GLfloat) ctx->Pixel.MapItoI[i];
+	 }
+	 break;
+      case GL_PIXEL_MAP_S_TO_S:
+         for (i=0;i<ctx->Pixel.MapStoSsize;i++) {
+	    values[i] = (GLfloat) ctx->Pixel.MapStoS[i];
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_R:
+         MEMCPY(values,ctx->Pixel.MapItoR,ctx->Pixel.MapItoRsize*sizeof(GLfloat));
+	 break;
+      case GL_PIXEL_MAP_I_TO_G:
+         MEMCPY(values,ctx->Pixel.MapItoG,ctx->Pixel.MapItoGsize*sizeof(GLfloat));
+	 break;
+      case GL_PIXEL_MAP_I_TO_B:
+         MEMCPY(values,ctx->Pixel.MapItoB,ctx->Pixel.MapItoBsize*sizeof(GLfloat));
+	 break;
+      case GL_PIXEL_MAP_I_TO_A:
+         MEMCPY(values,ctx->Pixel.MapItoA,ctx->Pixel.MapItoAsize*sizeof(GLfloat));
+	 break;
+      case GL_PIXEL_MAP_R_TO_R:
+         MEMCPY(values,ctx->Pixel.MapRtoR,ctx->Pixel.MapRtoRsize*sizeof(GLfloat));
+	 break;
+      case GL_PIXEL_MAP_G_TO_G:
+         MEMCPY(values,ctx->Pixel.MapGtoG,ctx->Pixel.MapGtoGsize*sizeof(GLfloat));
+	 break;
+      case GL_PIXEL_MAP_B_TO_B:
+         MEMCPY(values,ctx->Pixel.MapBtoB,ctx->Pixel.MapBtoBsize*sizeof(GLfloat));
+	 break;
+      case GL_PIXEL_MAP_A_TO_A:
+         MEMCPY(values,ctx->Pixel.MapAtoA,ctx->Pixel.MapAtoAsize*sizeof(GLfloat));
+	 break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
+   }
+}
+
+
+void gl_GetPixelMapuiv( GLcontext *ctx, GLenum map, GLuint *values )
+{
+   GLint i;
+
+   ASSERT_OUTSIDE_BEGIN_END(ctx, "glGetPixelMapfv");
+
+   switch (map) {
+      case GL_PIXEL_MAP_I_TO_I:
+         MEMCPY(values, ctx->Pixel.MapItoI, ctx->Pixel.MapItoIsize*sizeof(GLint));
+	 break;
+      case GL_PIXEL_MAP_S_TO_S:
+         MEMCPY(values, ctx->Pixel.MapStoS, ctx->Pixel.MapStoSsize*sizeof(GLint));
+	 break;
+      case GL_PIXEL_MAP_I_TO_R:
+	 for (i=0;i<ctx->Pixel.MapItoRsize;i++) {
+	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoR[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_G:
+	 for (i=0;i<ctx->Pixel.MapItoGsize;i++) {
+	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoG[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_B:
+	 for (i=0;i<ctx->Pixel.MapItoBsize;i++) {
+	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoB[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_A:
+	 for (i=0;i<ctx->Pixel.MapItoAsize;i++) {
+	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapItoA[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_R_TO_R:
+	 for (i=0;i<ctx->Pixel.MapRtoRsize;i++) {
+	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapRtoR[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_G_TO_G:
+	 for (i=0;i<ctx->Pixel.MapGtoGsize;i++) {
+	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapGtoG[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_B_TO_B:
+	 for (i=0;i<ctx->Pixel.MapBtoBsize;i++) {
+	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapBtoB[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_A_TO_A:
+	 for (i=0;i<ctx->Pixel.MapAtoAsize;i++) {
+	    values[i] = FLOAT_TO_UINT( ctx->Pixel.MapAtoA[i] );
+	 }
+	 break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
+   }
+}
+
+
+void gl_GetPixelMapusv( GLcontext *ctx, GLenum map, GLushort *values )
+{
+   GLint i;
+
+   ASSERT_OUTSIDE_BEGIN_END(ctx, "glGetPixelMapfv");
+
+   switch (map) {
+      case GL_PIXEL_MAP_I_TO_I:
+	 for (i=0;i<ctx->Pixel.MapItoIsize;i++) {
+	    values[i] = (GLushort) ctx->Pixel.MapItoI[i];
+	 }
+	 break;
+      case GL_PIXEL_MAP_S_TO_S:
+	 for (i=0;i<ctx->Pixel.MapStoSsize;i++) {
+	    values[i] = (GLushort) ctx->Pixel.MapStoS[i];
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_R:
+	 for (i=0;i<ctx->Pixel.MapItoRsize;i++) {
+	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoR[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_G:
+	 for (i=0;i<ctx->Pixel.MapItoGsize;i++) {
+	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoG[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_B:
+	 for (i=0;i<ctx->Pixel.MapItoBsize;i++) {
+	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoB[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_I_TO_A:
+	 for (i=0;i<ctx->Pixel.MapItoAsize;i++) {
+	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapItoA[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_R_TO_R:
+	 for (i=0;i<ctx->Pixel.MapRtoRsize;i++) {
+	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapRtoR[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_G_TO_G:
+	 for (i=0;i<ctx->Pixel.MapGtoGsize;i++) {
+	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapGtoG[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_B_TO_B:
+	 for (i=0;i<ctx->Pixel.MapBtoBsize;i++) {
+	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapBtoB[i] );
+	 }
+	 break;
+      case GL_PIXEL_MAP_A_TO_A:
+	 for (i=0;i<ctx->Pixel.MapAtoAsize;i++) {
+	    values[i] = FLOAT_TO_USHORT( ctx->Pixel.MapAtoA[i] );
+	 }
+	 break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glGetPixelMapfv" );
+   }
+}
+
+
+
+/**********************************************************************/
+/*****                       glPixelTransfer                      *****/
+/**********************************************************************/
+
+
+/*
+ * Implements glPixelTransfer[fi] whether called immediately or from a
+ * display list.
+ */
+void gl_PixelTransferf( GLcontext *ctx, GLenum pname, GLfloat param )
+{
+   ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx, "glPixelTransfer");
+
+
+   switch (pname) {
+      case GL_MAP_COLOR:
+         ctx->Pixel.MapColorFlag = param ? GL_TRUE : GL_FALSE;
+	 break;
+      case GL_MAP_STENCIL:
+         ctx->Pixel.MapStencilFlag = param ? GL_TRUE : GL_FALSE;
+	 break;
+      case GL_INDEX_SHIFT:
+         ctx->Pixel.IndexShift = (GLint) param;
+	 break;
+      case GL_INDEX_OFFSET:
+         ctx->Pixel.IndexOffset = (GLint) param;
+	 break;
+      case GL_RED_SCALE:
+         ctx->Pixel.RedScale = param;
+	 break;
+      case GL_RED_BIAS:
+         ctx->Pixel.RedBias = param;
+	 break;
+      case GL_GREEN_SCALE:
+         ctx->Pixel.GreenScale = param;
+	 break;
+      case GL_GREEN_BIAS:
+         ctx->Pixel.GreenBias = param;
+	 break;
+      case GL_BLUE_SCALE:
+         ctx->Pixel.BlueScale = param;
+	 break;
+      case GL_BLUE_BIAS:
+         ctx->Pixel.BlueBias = param;
+	 break;
+      case GL_ALPHA_SCALE:
+         ctx->Pixel.AlphaScale = param;
+	 break;
+      case GL_ALPHA_BIAS:
+         ctx->Pixel.AlphaBias = param;
+	 break;
+      case GL_DEPTH_SCALE:
+         ctx->Pixel.DepthScale = param;
+	 break;
+      case GL_DEPTH_BIAS:
+         ctx->Pixel.DepthBias = param;
+	 break;
+      default:
+         gl_error( ctx, GL_INVALID_ENUM, "glPixelTransfer(pname)" );
+         return;
+   }
+
+   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) {
+      ctx->Pixel.ScaleOrBiasRGBA = GL_TRUE;
+   }
+   else {
+      ctx->Pixel.ScaleOrBiasRGBA = GL_FALSE;
+   }
+}
+
+
+
+
+/*
+ * Pixel processing functions
+ */
+
+
+/*
+ * Apply scale and bias factors to an array of RGBA pixels.
+ */
+void gl_scale_and_bias_color( const GLcontext *ctx, GLuint n,
+                              GLfloat red[], GLfloat green[],
+                              GLfloat blue[], GLfloat alpha[] )
+{
+   GLuint i;
+   for (i=0;i<n;i++) {
+      GLfloat r = red[i]   * ctx->Pixel.RedScale   + ctx->Pixel.RedBias;
+      GLfloat g = green[i] * ctx->Pixel.GreenScale + ctx->Pixel.GreenBias;
+      GLfloat b = blue[i]  * ctx->Pixel.BlueScale  + ctx->Pixel.BlueBias;
+      GLfloat a = alpha[i] * ctx->Pixel.AlphaScale + ctx->Pixel.AlphaBias;
+      red[i]   = CLAMP( r, 0.0F, 1.0F );
+      green[i] = CLAMP( g, 0.0F, 1.0F );
+      blue[i]  = CLAMP( b, 0.0F, 1.0F );
+      alpha[i] = CLAMP( a, 0.0F, 1.0F );
+   }
+}
+
+
+/*
+ * Apply scale and bias factors to an array of RGBA pixels.
+ */
+void gl_scale_and_bias_rgba( const GLcontext *ctx, GLuint n, GLubyte rgba[][4] )
+{
+   GLfloat rbias = ctx->Pixel.RedBias   * 255.0F;
+   GLfloat gbias = ctx->Pixel.GreenBias * 255.0F;
+   GLfloat bbias = ctx->Pixel.BlueBias  * 255.0F;
+   GLfloat abias = ctx->Pixel.AlphaBias * 255.0F;
+   GLuint i;
+   for (i=0;i<n;i++) {
+      GLint r = (GLint) (rgba[i][RCOMP] * ctx->Pixel.RedScale   + rbias);
+      GLint g = (GLint) (rgba[i][GCOMP] * ctx->Pixel.GreenScale + gbias);
+      GLint b = (GLint) (rgba[i][BCOMP] * ctx->Pixel.BlueScale  + bbias);
+      GLint a = (GLint) (rgba[i][ACOMP] * ctx->Pixel.AlphaScale + abias);
+      rgba[i][RCOMP] = CLAMP( r, 0, 255 );
+      rgba[i][GCOMP] = CLAMP( g, 0, 255 );
+      rgba[i][BCOMP] = CLAMP( b, 0, 255 );
+      rgba[i][ACOMP] = CLAMP( a, 0, 255 );
+   }
+}
+
+
+/*
+ * Apply pixel mapping to an array of RGBA pixels.
+ */
+void gl_map_rgba( const GLcontext *ctx, GLuint n, GLubyte rgba[][4] )
+{
+   GLfloat rscale = (ctx->Pixel.MapRtoRsize - 1) / 255.0F;
+   GLfloat gscale = (ctx->Pixel.MapGtoGsize - 1) / 255.0F;
+   GLfloat bscale = (ctx->Pixel.MapBtoBsize - 1) / 255.0F;
+   GLfloat ascale = (ctx->Pixel.MapAtoAsize - 1) / 255.0F;
+   GLuint i;
+   for (i=0;i<n;i++) {
+      GLint ir = (GLint) (rgba[i][RCOMP] * rscale);
+      GLint ig = (GLint) (rgba[i][GCOMP] * gscale);
+      GLint ib = (GLint) (rgba[i][BCOMP] * bscale);
+      GLint ia = (GLint) (rgba[i][ACOMP] * ascale);
+      rgba[i][RCOMP] = (GLint) (ctx->Pixel.MapRtoR[ir] * 255.0F);
+      rgba[i][GCOMP] = (GLint) (ctx->Pixel.MapGtoG[ig] * 255.0F);
+      rgba[i][BCOMP] = (GLint) (ctx->Pixel.MapBtoB[ib] * 255.0F);
+      rgba[i][ACOMP] = (GLint) (ctx->Pixel.MapAtoA[ia] * 255.0F);
+   }
+}
+
+
+/*
+ * Apply pixel mapping to an array of RGBA pixels.
+ */
+void gl_map_color( const GLcontext *ctx, GLuint n,
+                   GLfloat red[], GLfloat green[],
+                   GLfloat blue[], GLfloat alpha[] )
+{
+   GLfloat rscale = ctx->Pixel.MapRtoRsize-1;
+   GLfloat gscale = ctx->Pixel.MapGtoGsize-1;
+   GLfloat bscale = ctx->Pixel.MapBtoBsize-1;
+   GLfloat ascale = ctx->Pixel.MapAtoAsize-1;
+   GLuint i;
+   for (i=0;i<n;i++) {
+      red[i]   = ctx->Pixel.MapRtoR[ (GLint) (red[i]   * rscale) ];
+      green[i] = ctx->Pixel.MapGtoG[ (GLint) (green[i] * gscale) ];
+      blue[i]  = ctx->Pixel.MapBtoB[ (GLint) (blue[i]  * bscale) ];
+      alpha[i] = ctx->Pixel.MapAtoA[ (GLint) (alpha[i] * ascale) ];
+   }
+}
+
+
+
+/*
+ * Apply color index shift and offset to an array of pixels.
+ */
+void gl_shift_and_offset_ci( const GLcontext *ctx, GLuint n, GLuint indexes[] )
+{
+   GLint shift = ctx->Pixel.IndexShift;
+   GLint offset = ctx->Pixel.IndexOffset;
+   GLuint i;
+   if (shift > 0) {
+      for (i=0;i<n;i++) {
+         indexes[i] = (indexes[i] << shift) + offset;
+      }
+   }
+   else if (shift < 0) {
+      shift = -shift;
+      for (i=0;i<n;i++) {
+         indexes[i] = (indexes[i] >> shift) + offset;
+      }
+   }
+   else {
+      for (i=0;i<n;i++) {
+         indexes[i] = indexes[i] + offset;
+      }
+   }
+}
+
+
+/*
+ * Apply color index mapping to color indexes.
+ */
+void gl_map_ci( const GLcontext *ctx, GLuint n, GLuint index[] )
+{
+   GLuint mask = ctx->Pixel.MapItoIsize - 1;
+   GLuint i;
+   for (i=0;i<n;i++) {
+      index[i] = ctx->Pixel.MapItoI[ index[i] & mask ];
+   }
+}
+
+
+/*
+ * Map color indexes to rgb values.
+ */
+void gl_map_ci_to_rgba( const GLcontext *ctx, GLuint n, const GLuint index[],
+                        GLubyte rgba[][4] )
+{
+   GLuint rmask = ctx->Pixel.MapItoRsize - 1;
+   GLuint gmask = ctx->Pixel.MapItoGsize - 1;
+   GLuint bmask = ctx->Pixel.MapItoBsize - 1;
+   GLuint amask = ctx->Pixel.MapItoAsize - 1;
+   const GLubyte *rMap = ctx->Pixel.MapItoR8;
+   const GLubyte *gMap = ctx->Pixel.MapItoG8;
+   const GLubyte *bMap = ctx->Pixel.MapItoB8;
+   const GLubyte *aMap = ctx->Pixel.MapItoA8;
+   GLuint i;
+   for (i=0;i<n;i++) {
+      rgba[i][RCOMP] = rMap[index[i] & rmask];
+      rgba[i][GCOMP] = gMap[index[i] & gmask];
+      rgba[i][BCOMP] = bMap[index[i] & bmask];
+      rgba[i][ACOMP] = aMap[index[i] & amask];
+   }
+}
+
+
+/*
+ * Map 8-bit color indexes to rgb values.
+ */
+void gl_map_ci8_to_rgba( const GLcontext *ctx, GLuint n, const GLubyte index[],
+                         GLubyte rgba[][4] )
+{
+   GLuint rmask = ctx->Pixel.MapItoRsize - 1;
+   GLuint gmask = ctx->Pixel.MapItoGsize - 1;
+   GLuint bmask = ctx->Pixel.MapItoBsize - 1;
+   GLuint amask = ctx->Pixel.MapItoAsize - 1;
+   const GLubyte *rMap = ctx->Pixel.MapItoR8;
+   const GLubyte *gMap = ctx->Pixel.MapItoG8;
+   const GLubyte *bMap = ctx->Pixel.MapItoB8;
+   const GLubyte *aMap = ctx->Pixel.MapItoA8;
+   GLuint i;
+   for (i=0;i<n;i++) {
+      rgba[i][RCOMP] = rMap[index[i] & rmask];
+      rgba[i][GCOMP] = gMap[index[i] & gmask];
+      rgba[i][BCOMP] = bMap[index[i] & bmask];
+      rgba[i][ACOMP] = aMap[index[i] & amask];
+   }
+}
+
+
+void gl_map_ci_to_color( const GLcontext *ctx, GLuint n, const GLuint index[],
+                         GLfloat r[], GLfloat g[],
+                         GLfloat b[], GLfloat a[] )
+{
+   GLuint rmask = ctx->Pixel.MapItoRsize - 1;
+   GLuint gmask = ctx->Pixel.MapItoGsize - 1;
+   GLuint bmask = ctx->Pixel.MapItoBsize - 1;
+   GLuint amask = ctx->Pixel.MapItoAsize - 1;
+   GLuint i;
+   for (i=0;i<n;i++) {
+      r[i] = ctx->Pixel.MapItoR[index[i] & rmask];
+      g[i] = ctx->Pixel.MapItoG[index[i] & gmask];
+      b[i] = ctx->Pixel.MapItoB[index[i] & bmask];
+      a[i] = ctx->Pixel.MapItoA[index[i] & amask];
+   }
+}
+
+
+
+void gl_shift_and_offset_stencil( const GLcontext *ctx, GLuint n,
+                                  GLstencil stencil[] )
+{
+   GLuint i;
+   GLint shift = ctx->Pixel.IndexShift;
+   GLint offset = ctx->Pixel.IndexOffset;
+   if (shift > 0) {
+      for (i=0;i<n;i++) {
+         stencil[i] = (stencil[i] << shift) + offset;
+      }
+   }
+   else if (shift < 0) {
+      shift = -shift;
+      for (i=0;i<n;i++) {
+         stencil[i] = (stencil[i] >> shift) + offset;
+      }
+   }
+   else {
+      for (i=0;i<n;i++) {
+         stencil[i] = stencil[i] + offset;
+      }
+   }
+
+}
+
+
+
+void gl_map_stencil( const GLcontext *ctx, GLuint n, GLstencil stencil[] )
+{
+   GLuint mask = ctx->Pixel.MapStoSsize - 1;
+   GLuint i;
+   for (i=0;i<n;i++) {
+      stencil[i] = ctx->Pixel.MapStoS[ stencil[i] & mask ];
+   }
+}
+