text: /*
   * Mesa 3-D graphics library
   * Version:  6.1
   *
   * Copyright (C) 1999-2004  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.
   */
  /* $XFree86: xc/extras/Mesa/src/mesa/main/colortab.c,v 1.5 2004/12/13 22:40:54 tsi Exp $ */
  
  #include "glheader.h"
  #include "imports.h"
  #include "colortab.h"
  #include "context.h"
  #include "image.h"
  #include "macros.h"
  #include "state.h"
  
  
  /*
   * Given an internalFormat token passed to glColorTable,
   * return the corresponding base format.
   * Return -1 if invalid token.
   */
  static GLint
  base_colortab_format( GLenum format )
  {
     switch (format) {
        case GL_ALPHA:
        case GL_ALPHA4:
        case GL_ALPHA8:
        case GL_ALPHA12:
        case GL_ALPHA16:
           return GL_ALPHA;
        case GL_LUMINANCE:
        case GL_LUMINANCE4:
        case GL_LUMINANCE8:
        case GL_LUMINANCE12:
        case GL_LUMINANCE16:
           return GL_LUMINANCE;
        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 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 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;
        default:
           return -1;  /* error */
     }
  }
  
  
  
  /*
   * Examine table's format and set the component sizes accordingly.
   */
  static void
  set_component_sizes( struct gl_color_table *table )
  {
     GLubyte sz;
  
     switch (table->Type) {
     case GL_UNSIGNED_BYTE:
        sz = sizeof(GLubyte);
        break;
     case GL_UNSIGNED_SHORT:
        sz = sizeof(GLushort);
        break;
     case GL_FLOAT:
        sz = sizeof(GLfloat);
        break;
     default:
        _mesa_problem(NULL, "bad color table type in set_component_sizes 0x%x", table->Type);
        return;
     }
  
     switch (table->Format) {
        case GL_ALPHA:
           table->RedSize = 0;
           table->GreenSize = 0;
           table->BlueSize = 0;
           table->AlphaSize = sz;
           table->IntensitySize = 0;
           table->LuminanceSize = 0;
           break;
        case GL_LUMINANCE:
           table->RedSize = 0;
           table->GreenSize = 0;
           table->BlueSize = 0;
           table->AlphaSize = 0;
           table->IntensitySize = 0;
           table->LuminanceSize = sz;
           break;
        case GL_LUMINANCE_ALPHA:
           table->RedSize = 0;
           table->GreenSize = 0;
           table->BlueSize = 0;
           table->AlphaSize = sz;
           table->IntensitySize = 0;
           table->LuminanceSize = sz;
           break;
        case GL_INTENSITY:
           table->RedSize = 0;
           table->GreenSize = 0;
           table->BlueSize = 0;
           table->AlphaSize = 0;
           table->IntensitySize = sz;
           table->LuminanceSize = 0;
           break;
        case GL_RGB:
           table->RedSize = sz;
           table->GreenSize = sz;
           table->BlueSize = sz;
           table->AlphaSize = 0;
           table->IntensitySize = 0;
           table->LuminanceSize = 0;
           break;
        case GL_RGBA:
           table->RedSize = sz;
           table->GreenSize = sz;
           table->BlueSize = sz;
           table->AlphaSize = sz;
           table->IntensitySize = 0;
           table->LuminanceSize = 0;
           break;
        default:
           _mesa_problem(NULL, "unexpected format in set_component_sizes");
     }
  }
  
  
  
  /**
   * Update/replace all or part of a color table.  Helper function
   * used by _mesa_ColorTable() and _mesa_ColorSubTable().
   * The table->Table buffer should already be allocated.
   * \param start first entry to update
   * \param count number of entries to update
   * \param format format of user-provided table data
   * \param type datatype of user-provided table data
   * \param data user-provided table data
   * \param [rgba]Scale - RGBA scale factors
   * \param [rgba]Bias - RGBA bias factors
   */
  static void
  store_colortable_entries(GLcontext *ctx, struct gl_color_table *table,
  			 GLsizei start, GLsizei count,
  			 GLenum format, GLenum type, const GLvoid *data,
  			 GLfloat rScale, GLfloat rBias,
  			 GLfloat gScale, GLfloat gBias,
  			 GLfloat bScale, GLfloat bBias,
  			 GLfloat aScale, GLfloat aBias)
  {
     if (table->Type == GL_FLOAT) {
        /* convert user-provided data to GLfloat values */
        GLfloat tempTab[MAX_COLOR_TABLE_SIZE * 4];
        GLfloat *tableF;
        GLint i;
  
        _mesa_unpack_color_span_float(ctx,
  				    count,          /* number of pixels */
  				    table->Format,  /* dest format */
                                      tempTab,        /* dest address */
                                      format, type, data, /* src data */
  				    &ctx->Unpack,
                                      IMAGE_CLAMP_BIT); /* transfer ops */
  
        tableF = (GLfloat *) table->Table;
  
        switch (table->Format) {
           case GL_INTENSITY:
              for (i = 0; i < count; i++) {
                 GLuint j = start + i;
                 tableF[j] = CLAMP(tempTab[i] * rScale + rBias, 0.0F, 1.0F);
              }
              break;
           case GL_LUMINANCE:
              for (i = 0; i < count; i++) {
                 GLuint j = start + i;
                 tableF[j] = CLAMP(tempTab[i] * rScale + rBias, 0.0F, 1.0F);
              }
              break;
           case GL_ALPHA:
              for (i = 0; i < count; i++) {
                 GLuint j = start + i;
                 tableF[j] = CLAMP(tempTab[i] * aScale + aBias, 0.0F, 1.0F);
              }
              break;
           case GL_LUMINANCE_ALPHA:
              for (i = 0; i < count; i++) {
                 GLuint j = start + i;
                 tableF[j*2+0] = CLAMP(tempTab[i*2+0] * rScale + rBias, 0.0F, 1.0F);
                 tableF[j*2+1] = CLAMP(tempTab[i*2+1] * aScale + aBias, 0.0F, 1.0F);
              }
              break;
           case GL_RGB:
              for (i = 0; i < count; i++) {
                 GLuint j = start + i;
                 tableF[j*3+0] = CLAMP(tempTab[i*3+0] * rScale + rBias, 0.0F, 1.0F);
                 tableF[j*3+1] = CLAMP(tempTab[i*3+1] * gScale + gBias, 0.0F, 1.0F);
                 tableF[j*3+2] = CLAMP(tempTab[i*3+2] * bScale + bBias, 0.0F, 1.0F);
              }
              break;
           case GL_RGBA:
              for (i = 0; i < count; i++) {
                 GLuint j = start + i;
                 tableF[j*4+0] = CLAMP(tempTab[i*4+0] * rScale + rBias, 0.0F, 1.0F);
                 tableF[j*4+1] = CLAMP(tempTab[i*4+1] * gScale + gBias, 0.0F, 1.0F);
                 tableF[j*4+2] = CLAMP(tempTab[i*4+2] * bScale + bBias, 0.0F, 1.0F);
                 tableF[j*4+3] = CLAMP(tempTab[i*4+3] * aScale + aBias, 0.0F, 1.0F);
              }
              break;
           default:
              _mesa_problem(ctx, "Bad format in store_colortable_entries");
              return;
           }
     }
     else {
        /* non-float (GLchan) */
        const GLint comps = _mesa_components_in_format(table->Format);
        GLchan *dest = (GLchan *) table->Table + start * comps;
        _mesa_unpack_color_span_chan(ctx, count,         /* number of entries */
  				   table->Format,      /* dest format */
  				   dest,               /* dest address */
                                     format, type, data, /* src data */
  				   &ctx->Unpack,
  				   0);                 /* transfer ops */
     }
  }
  
  
  
  void GLAPIENTRY
  _mesa_ColorTable( GLenum target, GLenum internalFormat,
                    GLsizei width, GLenum format, GLenum type,
                    const GLvoid *data )
  {
     GET_CURRENT_CONTEXT(ctx);
     struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
     struct gl_texture_object *texObj = NULL;
     struct gl_color_table *table = NULL;
     GLboolean proxy = GL_FALSE;
     GLint baseFormat;
     GLfloat rScale = 1.0, gScale = 1.0, bScale = 1.0, aScale = 1.0;
     GLfloat rBias  = 0.0, gBias  = 0.0, bBias  = 0.0, aBias  = 0.0;
     GLenum tableType = CHAN_TYPE;
     GLint comps;
     ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx); /* too complex */
  
     switch (target) {
        case GL_TEXTURE_1D:
           texObj = texUnit->Current1D;
           table = &texObj->Palette;
           break;
        case GL_TEXTURE_2D:
           texObj = texUnit->Current2D;
           table = &texObj->Palette;
           break;
        case GL_TEXTURE_3D:
           texObj = texUnit->Current3D;
           table = &texObj->Palette;
           break;
        case GL_TEXTURE_CUBE_MAP_ARB:
           if (!ctx->Extensions.ARB_texture_cube_map) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorTable(target)");
              return;
           }
           texObj = texUnit->CurrentCubeMap;
           table = &texObj->Palette;
           break;
        case GL_PROXY_TEXTURE_1D:
           texObj = ctx->Texture.Proxy1D;
           table = &texObj->Palette;
           proxy = GL_TRUE;
           break;
        case GL_PROXY_TEXTURE_2D:
           texObj = ctx->Texture.Proxy2D;
           table = &texObj->Palette;
           proxy = GL_TRUE;
           break;
        case GL_PROXY_TEXTURE_3D:
           texObj = ctx->Texture.Proxy3D;
           table = &texObj->Palette;
           proxy = GL_TRUE;
           break;
        case GL_PROXY_TEXTURE_CUBE_MAP_ARB:
           if (!ctx->Extensions.ARB_texture_cube_map) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorTable(target)");
              return;
           }
           texObj = ctx->Texture.ProxyCubeMap;
           table = &texObj->Palette;
           break;
        case GL_SHARED_TEXTURE_PALETTE_EXT:
           table = &ctx->Texture.Palette;
           break;
        case GL_COLOR_TABLE:
           table = &ctx->ColorTable;
  	 tableType = GL_FLOAT;
           rScale = ctx->Pixel.ColorTableScale[0];
           gScale = ctx->Pixel.ColorTableScale[1];
           bScale = ctx->Pixel.ColorTableScale[2];
           aScale = ctx->Pixel.ColorTableScale[3];
           rBias = ctx->Pixel.ColorTableBias[0];
           gBias = ctx->Pixel.ColorTableBias[1];
           bBias = ctx->Pixel.ColorTableBias[2];
           aBias = ctx->Pixel.ColorTableBias[3];
           break;
        case GL_PROXY_COLOR_TABLE:
           table = &ctx->ProxyColorTable;
           proxy = GL_TRUE;
           break;
        case GL_TEXTURE_COLOR_TABLE_SGI:
           if (!ctx->Extensions.SGI_texture_color_table) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorTable(target)");
              return;
           }
           table = &(texUnit->ColorTable);
  	 tableType = GL_FLOAT;
           rScale = ctx->Pixel.TextureColorTableScale[0];
           gScale = ctx->Pixel.TextureColorTableScale[1];
           bScale = ctx->Pixel.TextureColorTableScale[2];
           aScale = ctx->Pixel.TextureColorTableScale[3];
           rBias = ctx->Pixel.TextureColorTableBias[0];
           gBias = ctx->Pixel.TextureColorTableBias[1];
           bBias = ctx->Pixel.TextureColorTableBias[2];
           aBias = ctx->Pixel.TextureColorTableBias[3];
           break;
        case GL_PROXY_TEXTURE_COLOR_TABLE_SGI:
           if (!ctx->Extensions.SGI_texture_color_table) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorTable(target)");
              return;
           }
           table = &(texUnit->ProxyColorTable);
           proxy = GL_TRUE;
           break;
        case GL_POST_CONVOLUTION_COLOR_TABLE:
           table = &ctx->PostConvolutionColorTable;
  	 tableType = GL_FLOAT;
           rScale = ctx->Pixel.PCCTscale[0];
           gScale = ctx->Pixel.PCCTscale[1];
           bScale = ctx->Pixel.PCCTscale[2];
           aScale = ctx->Pixel.PCCTscale[3];
           rBias = ctx->Pixel.PCCTbias[0];
           gBias = ctx->Pixel.PCCTbias[1];
           bBias = ctx->Pixel.PCCTbias[2];
           aBias = ctx->Pixel.PCCTbias[3];
           break;
        case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
           table = &ctx->ProxyPostConvolutionColorTable;
           proxy = GL_TRUE;
           break;
        case GL_POST_COLOR_MATRIX_COLOR_TABLE:
           table = &ctx->PostColorMatrixColorTable;
  	 tableType = GL_FLOAT;
           rScale = ctx->Pixel.PCMCTscale[0];
           gScale = ctx->Pixel.PCMCTscale[1];
           bScale = ctx->Pixel.PCMCTscale[2];
           aScale = ctx->Pixel.PCMCTscale[3];
           rBias = ctx->Pixel.PCMCTbias[0];
           gBias = ctx->Pixel.PCMCTbias[1];
           bBias = ctx->Pixel.PCMCTbias[2];
           aBias = ctx->Pixel.PCMCTbias[3];
           break;
        case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
           table = &ctx->ProxyPostColorMatrixColorTable;
           proxy = GL_TRUE;
           break;
        default:
           _mesa_error(ctx, GL_INVALID_ENUM, "glColorTable(target)");
           return;
     }
  
     assert(table);
  
     if (!_mesa_is_legal_format_and_type(ctx, format, type) ||
         format == GL_INTENSITY) {
        _mesa_error(ctx, GL_INVALID_OPERATION, "glColorTable(format or type)");
        return;
     }
  
     baseFormat = base_colortab_format(internalFormat);
     if (baseFormat < 0 || baseFormat == GL_COLOR_INDEX) {
        _mesa_error(ctx, GL_INVALID_ENUM, "glColorTable(internalFormat)");
        return;
     }
  
     if (width < 0 || (width != 0 && _mesa_bitcount(width) != 1)) {
        /* error */
        if (proxy) {
           table->Size = 0;
           table->IntFormat = (GLenum) 0;
           table->Format = (GLenum) 0;
        }
        else {
           _mesa_error(ctx, GL_INVALID_VALUE, "glColorTable(width=%d)", width);
        }
        return;
     }
  
     if (width > (GLsizei) ctx->Const.MaxColorTableSize) {
        if (proxy) {
           table->Size = 0;
           table->IntFormat = (GLenum) 0;
           table->Format = (GLenum) 0;
        }
        else {
           _mesa_error(ctx, GL_TABLE_TOO_LARGE, "glColorTable(width)");
        }
        return;
     }
  
     table->Size = width;
     table->IntFormat = internalFormat;
     table->Format = (GLenum) baseFormat;
     set_component_sizes(table);
  
     comps = _mesa_components_in_format(table->Format);
     assert(comps > 0);  /* error should have been caught sooner */
  
     if (!proxy) {
        /* free old table, if any */
        if (table->Table) {
           FREE(table->Table);
           table->Table = NULL;
        }
  
        if (width > 0) {
           if (tableType == GL_FLOAT) {
  	    table->Type = GL_FLOAT;
  	    table->Table = MALLOC(comps * width * sizeof(GLfloat));
  	 }
  	 else {
  	    table->Type = CHAN_TYPE;
              table->Table = MALLOC(comps * width * sizeof(GLchan));
  	 }
  
  	 if (!table->Table) {
  	    _mesa_error(ctx, GL_OUT_OF_MEMORY, "glColorTable");
  	    return;
  	 }
  
  	 store_colortable_entries(ctx, table,
  				  0, width,  /* start, count */
  				  format, type, data,
  				  rScale, rBias,
  				  gScale, gBias,
  				  bScale, bBias,
  				  aScale, aBias);
        }
     } /* proxy */
  
     if (texObj || target == GL_SHARED_TEXTURE_PALETTE_EXT) {
        /* texture object palette, texObj==NULL means the shared palette */
        if (ctx->Driver.UpdateTexturePalette) {
           (*ctx->Driver.UpdateTexturePalette)( ctx, texObj );
        }
     }
  
     ctx->NewState |= _NEW_PIXEL;
  }
  
  
  
  void GLAPIENTRY
  _mesa_ColorSubTable( GLenum target, GLsizei start,
                       GLsizei count, GLenum format, GLenum type,
                       const GLvoid *data )
  {
     GET_CURRENT_CONTEXT(ctx);
     struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
     struct gl_texture_object *texObj = NULL;
     struct gl_color_table *table = NULL;
     GLfloat rScale = 1.0, gScale = 1.0, bScale = 1.0, aScale = 1.0;
     GLfloat rBias  = 0.0, gBias  = 0.0, bBias  = 0.0, aBias  = 0.0;
     ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  
     switch (target) {
        case GL_TEXTURE_1D:
           texObj = texUnit->Current1D;
           table = &texObj->Palette;
           break;
        case GL_TEXTURE_2D:
           texObj = texUnit->Current2D;
           table = &texObj->Palette;
           break;
        case GL_TEXTURE_3D:
           texObj = texUnit->Current3D;
           table = &texObj->Palette;
           break;
        case GL_TEXTURE_CUBE_MAP_ARB:
           if (!ctx->Extensions.ARB_texture_cube_map) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorSubTable(target)");
              return;
           }
           texObj = texUnit->CurrentCubeMap;
           table = &texObj->Palette;
           break;
        case GL_SHARED_TEXTURE_PALETTE_EXT:
           table = &ctx->Texture.Palette;
           break;
        case GL_COLOR_TABLE:
           table = &ctx->ColorTable;
           rScale = ctx->Pixel.ColorTableScale[0];
           gScale = ctx->Pixel.ColorTableScale[1];
           bScale = ctx->Pixel.ColorTableScale[2];
           aScale = ctx->Pixel.ColorTableScale[3];
           rBias = ctx->Pixel.ColorTableBias[0];
           gBias = ctx->Pixel.ColorTableBias[1];
           bBias = ctx->Pixel.ColorTableBias[2];
           aBias = ctx->Pixel.ColorTableBias[3];
           break;
        case GL_TEXTURE_COLOR_TABLE_SGI:
           if (!ctx->Extensions.SGI_texture_color_table) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorSubTable(target)");
              return;
           }
           table = &(texUnit->ColorTable);
           rScale = ctx->Pixel.TextureColorTableScale[0];
           gScale = ctx->Pixel.TextureColorTableScale[1];
           bScale = ctx->Pixel.TextureColorTableScale[2];
           aScale = ctx->Pixel.TextureColorTableScale[3];
           rBias = ctx->Pixel.TextureColorTableBias[0];
           gBias = ctx->Pixel.TextureColorTableBias[1];
           bBias = ctx->Pixel.TextureColorTableBias[2];
           aBias = ctx->Pixel.TextureColorTableBias[3];
           break;
        case GL_POST_CONVOLUTION_COLOR_TABLE:
           table = &ctx->PostConvolutionColorTable;
           rScale = ctx->Pixel.PCCTscale[0];
           gScale = ctx->Pixel.PCCTscale[1];
           bScale = ctx->Pixel.PCCTscale[2];
           aScale = ctx->Pixel.PCCTscale[3];
           rBias = ctx->Pixel.PCCTbias[0];
           gBias = ctx->Pixel.PCCTbias[1];
           bBias = ctx->Pixel.PCCTbias[2];
           aBias = ctx->Pixel.PCCTbias[3];
           break;
        case GL_POST_COLOR_MATRIX_COLOR_TABLE:
           table = &ctx->PostColorMatrixColorTable;
           rScale = ctx->Pixel.PCMCTscale[0];
           gScale = ctx->Pixel.PCMCTscale[1];
           bScale = ctx->Pixel.PCMCTscale[2];
           aScale = ctx->Pixel.PCMCTscale[3];
           rBias = ctx->Pixel.PCMCTbias[0];
           gBias = ctx->Pixel.PCMCTbias[1];
           bBias = ctx->Pixel.PCMCTbias[2];
           aBias = ctx->Pixel.PCMCTbias[3];
           break;
        default:
           _mesa_error(ctx, GL_INVALID_ENUM, "glColorSubTable(target)");
           return;
     }
  
     assert(table);
  
     if (!_mesa_is_legal_format_and_type(ctx, format, type) ||
         format == GL_INTENSITY) {
        _mesa_error(ctx, GL_INVALID_OPERATION, "glColorSubTable(format or type)");
        return;
     }
  
     if (count < 1) {
        _mesa_error(ctx, GL_INVALID_VALUE, "glColorSubTable(count)");
        return;
     }
  
     /* error should have been caught sooner */
     assert(_mesa_components_in_format(table->Format) > 0);
  
     if (start + count > (GLint) table->Size) {
        _mesa_error(ctx, GL_INVALID_VALUE, "glColorSubTable(count)");
        return;
     }
  
     if (!table->Table) {
        _mesa_error(ctx, GL_OUT_OF_MEMORY, "glColorSubTable");
        return;
     }
  
     store_colortable_entries(ctx, table, start, count,
  			    format, type, data,
  			    rScale, rBias,
  			    gScale, gBias,
  			    bScale, bBias,
  			    aScale, aBias);
  
     if (texObj || target == GL_SHARED_TEXTURE_PALETTE_EXT) {
        /* per-texture object palette */
        if (ctx->Driver.UpdateTexturePalette) {
           (*ctx->Driver.UpdateTexturePalette)( ctx, texObj );
        }
     }
  
     ctx->NewState |= _NEW_PIXEL;
  }
  
  
  
  /* XXX not tested */
  void GLAPIENTRY
  _mesa_CopyColorTable(GLenum target, GLenum internalformat,
                       GLint x, GLint y, GLsizei width)
  {
     GET_CURRENT_CONTEXT(ctx);
     ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  
     /* Select buffer to read from */
     ctx->Driver.CopyColorTable( ctx, target, internalformat, x, y, width );
  }
  
  
  
  /* XXX not tested */
  void GLAPIENTRY
  _mesa_CopyColorSubTable(GLenum target, GLsizei start,
                          GLint x, GLint y, GLsizei width)
  {
     GET_CURRENT_CONTEXT(ctx);
     ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  
     ctx->Driver.CopyColorSubTable( ctx, target, start, x, y, width );
  }
  
  
  
  void GLAPIENTRY
  _mesa_GetColorTable( GLenum target, GLenum format,
                       GLenum type, GLvoid *data )
  {
     GET_CURRENT_CONTEXT(ctx);
     struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
     struct gl_color_table *table = NULL;
     GLchan rgba[MAX_COLOR_TABLE_SIZE][4];
     ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  
     if (ctx->NewState) {
        _mesa_update_state(ctx);
     }
  
     switch (target) {
        case GL_TEXTURE_1D:
           table = &texUnit->Current1D->Palette;
           break;
        case GL_TEXTURE_2D:
           table = &texUnit->Current2D->Palette;
           break;
        case GL_TEXTURE_3D:
           table = &texUnit->Current3D->Palette;
           break;
        case GL_TEXTURE_CUBE_MAP_ARB:
           if (!ctx->Extensions.ARB_texture_cube_map) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTable(target)");
              return;
           }
           table = &texUnit->CurrentCubeMap->Palette;
           break;
        case GL_SHARED_TEXTURE_PALETTE_EXT:
           table = &ctx->Texture.Palette;
           break;
        case GL_COLOR_TABLE:
           table = &ctx->ColorTable;
           break;
        case GL_TEXTURE_COLOR_TABLE_SGI:
           if (!ctx->Extensions.SGI_texture_color_table) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTable(target)");
              return;
           }
           table = &(texUnit->ColorTable);
           break;
        case GL_POST_CONVOLUTION_COLOR_TABLE:
           table = &ctx->PostConvolutionColorTable;
           break;
        case GL_POST_COLOR_MATRIX_COLOR_TABLE:
           table = &ctx->PostColorMatrixColorTable;
           break;
        default:
           _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTable(target)");
           return;
     }
  
     ASSERT(table);
  
     switch (table->Format) {
        case GL_ALPHA:
           if (table->Type == GL_FLOAT) {
              const GLfloat *tableF = (const GLfloat *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = 0;
                 rgba[i][GCOMP] = 0;
                 rgba[i][BCOMP] = 0;
                 rgba[i][ACOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
              }
           }
           else {
              const GLchan *tableUB = (const GLchan *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = 0;
                 rgba[i][GCOMP] = 0;
                 rgba[i][BCOMP] = 0;
                 rgba[i][ACOMP] = tableUB[i];
              }
           }
           break;
        case GL_LUMINANCE:
           if (table->Type == GL_FLOAT) {
              const GLfloat *tableF = (const GLfloat *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
                 rgba[i][GCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
                 rgba[i][BCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
                 rgba[i][ACOMP] = CHAN_MAX;
              }
           }
           else {
              const GLchan *tableUB = (const GLchan *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = tableUB[i];
                 rgba[i][GCOMP] = tableUB[i];
                 rgba[i][BCOMP] = tableUB[i];
                 rgba[i][ACOMP] = CHAN_MAX;
              }
           }
           break;
        case GL_LUMINANCE_ALPHA:
           if (table->Type == GL_FLOAT) {
              const GLfloat *tableF = (const GLfloat *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = IROUND_POS(tableF[i*2+0] * CHAN_MAXF);
                 rgba[i][GCOMP] = IROUND_POS(tableF[i*2+0] * CHAN_MAXF);
                 rgba[i][BCOMP] = IROUND_POS(tableF[i*2+0] * CHAN_MAXF);
                 rgba[i][ACOMP] = IROUND_POS(tableF[i*2+1] * CHAN_MAXF);
              }
           }
           else {
              const GLchan *tableUB = (const GLchan *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = tableUB[i*2+0];
                 rgba[i][GCOMP] = tableUB[i*2+0];
                 rgba[i][BCOMP] = tableUB[i*2+0];
                 rgba[i][ACOMP] = tableUB[i*2+1];
              }
           }
           break;
        case GL_INTENSITY:
           if (table->Type == GL_FLOAT) {
              const GLfloat *tableF = (const GLfloat *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
                 rgba[i][GCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
                 rgba[i][BCOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
                 rgba[i][ACOMP] = IROUND_POS(tableF[i] * CHAN_MAXF);
              }
           }
           else {
              const GLchan *tableUB = (const GLchan *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = tableUB[i];
                 rgba[i][GCOMP] = tableUB[i];
                 rgba[i][BCOMP] = tableUB[i];
                 rgba[i][ACOMP] = tableUB[i];
              }
           }
           break;
        case GL_RGB:
           if (table->Type == GL_FLOAT) {
              const GLfloat *tableF = (const GLfloat *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = IROUND_POS(tableF[i*3+0] * CHAN_MAXF);
                 rgba[i][GCOMP] = IROUND_POS(tableF[i*3+1] * CHAN_MAXF);
                 rgba[i][BCOMP] = IROUND_POS(tableF[i*3+2] * CHAN_MAXF);
                 rgba[i][ACOMP] = CHAN_MAX;
              }
           }
           else {
              const GLchan *tableUB = (const GLchan *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = tableUB[i*3+0];
                 rgba[i][GCOMP] = tableUB[i*3+1];
                 rgba[i][BCOMP] = tableUB[i*3+2];
                 rgba[i][ACOMP] = CHAN_MAX;
              }
           }
           break;
        case GL_RGBA:
           if (table->Type == GL_FLOAT) {
              const GLfloat *tableF = (const GLfloat *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = IROUND_POS(tableF[i*4+0] * CHAN_MAXF);
                 rgba[i][GCOMP] = IROUND_POS(tableF[i*4+1] * CHAN_MAXF);
                 rgba[i][BCOMP] = IROUND_POS(tableF[i*4+2] * CHAN_MAXF);
                 rgba[i][ACOMP] = IROUND_POS(tableF[i*4+3] * CHAN_MAXF);
              }
           }
           else {
              const GLchan *tableUB = (const GLchan *) table->Table;
              GLuint i;
              for (i = 0; i < table->Size; i++) {
                 rgba[i][RCOMP] = tableUB[i*4+0];
                 rgba[i][GCOMP] = tableUB[i*4+1];
                 rgba[i][BCOMP] = tableUB[i*4+2];
                 rgba[i][ACOMP] = tableUB[i*4+3];
              }
           }
           break;
        default:
           _mesa_problem(ctx, "bad table format in glGetColorTable");
           return;
     }
  
     _mesa_pack_rgba_span_chan(ctx, table->Size, (const GLchan (*)[4]) rgba,
                          format, type, data, &ctx->Pack, GL_FALSE);
  }
  
  
  
  void GLAPIENTRY
  _mesa_ColorTableParameterfv(GLenum target, GLenum pname, const GLfloat *params)
  {
     GET_CURRENT_CONTEXT(ctx);
     ASSERT_OUTSIDE_BEGIN_END_AND_FLUSH(ctx);
  
     switch (target) {
        case GL_COLOR_TABLE_SGI:
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              ctx->Pixel.ColorTableScale[0] = params[0];
              ctx->Pixel.ColorTableScale[1] = params[1];
              ctx->Pixel.ColorTableScale[2] = params[2];
              ctx->Pixel.ColorTableScale[3] = params[3];
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              ctx->Pixel.ColorTableBias[0] = params[0];
              ctx->Pixel.ColorTableBias[1] = params[1];
              ctx->Pixel.ColorTableBias[2] = params[2];
              ctx->Pixel.ColorTableBias[3] = params[3];
           }
           else {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorTableParameterfv(pname)");
              return;
           }
           break;
        case GL_TEXTURE_COLOR_TABLE_SGI:
           if (!ctx->Extensions.SGI_texture_color_table) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorTableParameter(target)");
              return;
           }
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              ctx->Pixel.TextureColorTableScale[0] = params[0];
              ctx->Pixel.TextureColorTableScale[1] = params[1];
              ctx->Pixel.TextureColorTableScale[2] = params[2];
              ctx->Pixel.TextureColorTableScale[3] = params[3];
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              ctx->Pixel.TextureColorTableBias[0] = params[0];
              ctx->Pixel.TextureColorTableBias[1] = params[1];
              ctx->Pixel.TextureColorTableBias[2] = params[2];
              ctx->Pixel.TextureColorTableBias[3] = params[3];
           }
           else {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorTableParameterfv(pname)");
              return;
           }
           break;
        case GL_POST_CONVOLUTION_COLOR_TABLE_SGI:
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              ctx->Pixel.PCCTscale[0] = params[0];
              ctx->Pixel.PCCTscale[1] = params[1];
              ctx->Pixel.PCCTscale[2] = params[2];
              ctx->Pixel.PCCTscale[3] = params[3];
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              ctx->Pixel.PCCTbias[0] = params[0];
              ctx->Pixel.PCCTbias[1] = params[1];
              ctx->Pixel.PCCTbias[2] = params[2];
              ctx->Pixel.PCCTbias[3] = params[3];
           }
           else {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorTableParameterfv(pname)");
              return;
           }
           break;
        case GL_POST_COLOR_MATRIX_COLOR_TABLE_SGI:
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              ctx->Pixel.PCMCTscale[0] = params[0];
              ctx->Pixel.PCMCTscale[1] = params[1];
              ctx->Pixel.PCMCTscale[2] = params[2];
              ctx->Pixel.PCMCTscale[3] = params[3];
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              ctx->Pixel.PCMCTbias[0] = params[0];
              ctx->Pixel.PCMCTbias[1] = params[1];
              ctx->Pixel.PCMCTbias[2] = params[2];
              ctx->Pixel.PCMCTbias[3] = params[3];
           }
           else {
              _mesa_error(ctx, GL_INVALID_ENUM, "glColorTableParameterfv(pname)");
              return;
           }
           break;
        default:
           _mesa_error(ctx, GL_INVALID_ENUM, "glColorTableParameter(target)");
           return;
     }
  
     ctx->NewState |= _NEW_PIXEL;
  }
  
  
  
  void GLAPIENTRY
  _mesa_ColorTableParameteriv(GLenum target, GLenum pname, const GLint *params)
  {
     GLfloat fparams[4];
     if (pname == GL_COLOR_TABLE_SGI ||
         pname == GL_TEXTURE_COLOR_TABLE_SGI ||
         pname == GL_POST_CONVOLUTION_COLOR_TABLE_SGI ||
         pname == GL_POST_COLOR_MATRIX_COLOR_TABLE_SGI) {
        /* four values */
        fparams[0] = (GLfloat) params[0];
        fparams[1] = (GLfloat) params[1];
        fparams[2] = (GLfloat) params[2];
        fparams[3] = (GLfloat) params[3];
     }
     else {
        /* one values */
        fparams[0] = (GLfloat) params[0];
     }
     _mesa_ColorTableParameterfv(target, pname, fparams);
  }
  
  
  
  void GLAPIENTRY
  _mesa_GetColorTableParameterfv( GLenum target, GLenum pname, GLfloat *params )
  {
     GET_CURRENT_CONTEXT(ctx);
     struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
     struct gl_color_table *table = NULL;
     ASSERT_OUTSIDE_BEGIN_END(ctx);
  
     switch (target) {
        case GL_TEXTURE_1D:
           table = &texUnit->Current1D->Palette;
           break;
        case GL_TEXTURE_2D:
           table = &texUnit->Current2D->Palette;
           break;
        case GL_TEXTURE_3D:
           table = &texUnit->Current3D->Palette;
           break;
        case GL_TEXTURE_CUBE_MAP_ARB:
           if (!ctx->Extensions.ARB_texture_cube_map) {
              _mesa_error(ctx, GL_INVALID_ENUM,
                          "glGetColorTableParameterfv(target)");
              return;
           }
           table = &texUnit->CurrentCubeMap->Palette;
           break;
        case GL_PROXY_TEXTURE_1D:
           table = &ctx->Texture.Proxy1D->Palette;
           break;
        case GL_PROXY_TEXTURE_2D:
           table = &ctx->Texture.Proxy2D->Palette;
           break;
        case GL_PROXY_TEXTURE_3D:
           table = &ctx->Texture.Proxy3D->Palette;
           break;
        case GL_PROXY_TEXTURE_CUBE_MAP_ARB:
           if (!ctx->Extensions.ARB_texture_cube_map) {
              _mesa_error(ctx, GL_INVALID_ENUM,
                          "glGetColorTableParameterfv(target)");
              return;
           }
           table = &ctx->Texture.ProxyCubeMap->Palette;
           break;
        case GL_SHARED_TEXTURE_PALETTE_EXT:
           table = &ctx->Texture.Palette;
           break;
        case GL_COLOR_TABLE:
           table = &ctx->ColorTable;
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              params[0] = ctx->Pixel.ColorTableScale[0];
              params[1] = ctx->Pixel.ColorTableScale[1];
              params[2] = ctx->Pixel.ColorTableScale[2];
              params[3] = ctx->Pixel.ColorTableScale[3];
              return;
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              params[0] = ctx->Pixel.ColorTableBias[0];
              params[1] = ctx->Pixel.ColorTableBias[1];
              params[2] = ctx->Pixel.ColorTableBias[2];
              params[3] = ctx->Pixel.ColorTableBias[3];
              return;
           }
           break;
        case GL_PROXY_COLOR_TABLE:
           table = &ctx->ProxyColorTable;
           break;
        case GL_TEXTURE_COLOR_TABLE_SGI:
           if (!ctx->Extensions.SGI_texture_color_table) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTableParameter(target)");
              return;
           }
           table = &(texUnit->ColorTable);
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              params[0] = ctx->Pixel.TextureColorTableScale[0];
              params[1] = ctx->Pixel.TextureColorTableScale[1];
              params[2] = ctx->Pixel.TextureColorTableScale[2];
              params[3] = ctx->Pixel.TextureColorTableScale[3];
              return;
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              params[0] = ctx->Pixel.TextureColorTableBias[0];
              params[1] = ctx->Pixel.TextureColorTableBias[1];
              params[2] = ctx->Pixel.TextureColorTableBias[2];
              params[3] = ctx->Pixel.TextureColorTableBias[3];
              return;
           }
           break;
        case GL_PROXY_TEXTURE_COLOR_TABLE_SGI:
           if (!ctx->Extensions.SGI_texture_color_table) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTableParameter(target)");
              return;
           }
           table = &(texUnit->ProxyColorTable);
           break;
        case GL_POST_CONVOLUTION_COLOR_TABLE:
           table = &ctx->PostConvolutionColorTable;
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              params[0] = ctx->Pixel.PCCTscale[0];
              params[1] = ctx->Pixel.PCCTscale[1];
              params[2] = ctx->Pixel.PCCTscale[2];
              params[3] = ctx->Pixel.PCCTscale[3];
              return;
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              params[0] = ctx->Pixel.PCCTbias[0];
              params[1] = ctx->Pixel.PCCTbias[1];
              params[2] = ctx->Pixel.PCCTbias[2];
              params[3] = ctx->Pixel.PCCTbias[3];
              return;
           }
           break;
        case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
           table = &ctx->ProxyPostConvolutionColorTable;
           break;
        case GL_POST_COLOR_MATRIX_COLOR_TABLE:
           table = &ctx->PostColorMatrixColorTable;
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              params[0] = ctx->Pixel.PCMCTscale[0];
              params[1] = ctx->Pixel.PCMCTscale[1];
              params[2] = ctx->Pixel.PCMCTscale[2];
              params[3] = ctx->Pixel.PCMCTscale[3];
              return;
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              params[0] = ctx->Pixel.PCMCTbias[0];
              params[1] = ctx->Pixel.PCMCTbias[1];
              params[2] = ctx->Pixel.PCMCTbias[2];
              params[3] = ctx->Pixel.PCMCTbias[3];
              return;
           }
           break;
        case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
           table = &ctx->ProxyPostColorMatrixColorTable;
           break;
        default:
           _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTableParameterfv(target)");
           return;
     }
  
     assert(table);
  
     switch (pname) {
        case GL_COLOR_TABLE_FORMAT:
           *params = (GLfloat) table->IntFormat;
           break;
        case GL_COLOR_TABLE_WIDTH:
           *params = (GLfloat) table->Size;
           break;
        case GL_COLOR_TABLE_RED_SIZE:
           *params = (GLfloat) table->RedSize;
           break;
        case GL_COLOR_TABLE_GREEN_SIZE:
           *params = (GLfloat) table->GreenSize;
           break;
        case GL_COLOR_TABLE_BLUE_SIZE:
           *params = (GLfloat) table->BlueSize;
           break;
        case GL_COLOR_TABLE_ALPHA_SIZE:
           *params = (GLfloat) table->AlphaSize;
           break;
        case GL_COLOR_TABLE_LUMINANCE_SIZE:
           *params = (GLfloat) table->LuminanceSize;
           break;
        case GL_COLOR_TABLE_INTENSITY_SIZE:
           *params = (GLfloat) table->IntensitySize;
           break;
        default:
           _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTableParameterfv(pname)" );
           return;
     }
  }
  
  
  
  void GLAPIENTRY
  _mesa_GetColorTableParameteriv( GLenum target, GLenum pname, GLint *params )
  {
     GET_CURRENT_CONTEXT(ctx);
     struct gl_texture_unit *texUnit = &ctx->Texture.Unit[ctx->Texture.CurrentUnit];
     struct gl_color_table *table = NULL;
     ASSERT_OUTSIDE_BEGIN_END(ctx);
  
     switch (target) {
        case GL_TEXTURE_1D:
           table = &texUnit->Current1D->Palette;
           break;
        case GL_TEXTURE_2D:
           table = &texUnit->Current2D->Palette;
           break;
        case GL_TEXTURE_3D:
           table = &texUnit->Current3D->Palette;
           break;
        case GL_TEXTURE_CUBE_MAP_ARB:
           if (!ctx->Extensions.ARB_texture_cube_map) {
              _mesa_error(ctx, GL_INVALID_ENUM,
                          "glGetColorTableParameteriv(target)");
              return;
           }
           table = &texUnit->CurrentCubeMap->Palette;
           break;
        case GL_PROXY_TEXTURE_1D:
           table = &ctx->Texture.Proxy1D->Palette;
           break;
        case GL_PROXY_TEXTURE_2D:
           table = &ctx->Texture.Proxy2D->Palette;
           break;
        case GL_PROXY_TEXTURE_3D:
           table = &ctx->Texture.Proxy3D->Palette;
           break;
        case GL_PROXY_TEXTURE_CUBE_MAP_ARB:
           if (!ctx->Extensions.ARB_texture_cube_map) {
              _mesa_error(ctx, GL_INVALID_ENUM,
                          "glGetColorTableParameteriv(target)");
              return;
           }
           table = &ctx->Texture.ProxyCubeMap->Palette;
           break;
        case GL_SHARED_TEXTURE_PALETTE_EXT:
           table = &ctx->Texture.Palette;
           break;
        case GL_COLOR_TABLE:
           table = &ctx->ColorTable;
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              params[0] = (GLint) ctx->Pixel.ColorTableScale[0];
              params[1] = (GLint) ctx->Pixel.ColorTableScale[1];
              params[2] = (GLint) ctx->Pixel.ColorTableScale[2];
              params[3] = (GLint) ctx->Pixel.ColorTableScale[3];
              return;
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              params[0] = (GLint) ctx->Pixel.ColorTableBias[0];
              params[1] = (GLint) ctx->Pixel.ColorTableBias[1];
              params[2] = (GLint) ctx->Pixel.ColorTableBias[2];
              params[3] = (GLint) ctx->Pixel.ColorTableBias[3];
              return;
           }
           break;
        case GL_PROXY_COLOR_TABLE:
           table = &ctx->ProxyColorTable;
           break;
        case GL_TEXTURE_COLOR_TABLE_SGI:
           if (!ctx->Extensions.SGI_texture_color_table) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTableParameter(target)");
              return;
           }
           table = &(texUnit->ColorTable);
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              params[0] = (GLint) ctx->Pixel.TextureColorTableScale[0];
              params[1] = (GLint) ctx->Pixel.TextureColorTableScale[1];
              params[2] = (GLint) ctx->Pixel.TextureColorTableScale[2];
              params[3] = (GLint) ctx->Pixel.TextureColorTableScale[3];
              return;
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              params[0] = (GLint) ctx->Pixel.TextureColorTableBias[0];
              params[1] = (GLint) ctx->Pixel.TextureColorTableBias[1];
              params[2] = (GLint) ctx->Pixel.TextureColorTableBias[2];
              params[3] = (GLint) ctx->Pixel.TextureColorTableBias[3];
              return;
           }
           break;
        case GL_PROXY_TEXTURE_COLOR_TABLE_SGI:
           if (!ctx->Extensions.SGI_texture_color_table) {
              _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTableParameter(target)");
              return;
           }
           table = &(texUnit->ProxyColorTable);
           break;
        case GL_POST_CONVOLUTION_COLOR_TABLE:
           table = &ctx->PostConvolutionColorTable;
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              params[0] = (GLint) ctx->Pixel.PCCTscale[0];
              params[1] = (GLint) ctx->Pixel.PCCTscale[1];
              params[2] = (GLint) ctx->Pixel.PCCTscale[2];
              params[3] = (GLint) ctx->Pixel.PCCTscale[3];
              return;
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              params[0] = (GLint) ctx->Pixel.PCCTbias[0];
              params[1] = (GLint) ctx->Pixel.PCCTbias[1];
              params[2] = (GLint) ctx->Pixel.PCCTbias[2];
              params[3] = (GLint) ctx->Pixel.PCCTbias[3];
              return;
           }
           break;
        case GL_PROXY_POST_CONVOLUTION_COLOR_TABLE:
           table = &ctx->ProxyPostConvolutionColorTable;
           break;
        case GL_POST_COLOR_MATRIX_COLOR_TABLE:
           table = &ctx->PostColorMatrixColorTable;
           if (pname == GL_COLOR_TABLE_SCALE_SGI) {
              params[0] = (GLint) ctx->Pixel.PCMCTscale[0];
              params[1] = (GLint) ctx->Pixel.PCMCTscale[1];
              params[2] = (GLint) ctx->Pixel.PCMCTscale[2];
              params[3] = (GLint) ctx->Pixel.PCMCTscale[3];
              return;
           }
           else if (pname == GL_COLOR_TABLE_BIAS_SGI) {
              params[0] = (GLint) ctx->Pixel.PCMCTbias[0];
              params[1] = (GLint) ctx->Pixel.PCMCTbias[1];
              params[2] = (GLint) ctx->Pixel.PCMCTbias[2];
              params[3] = (GLint) ctx->Pixel.PCMCTbias[3];
              return;
           }
           break;
        case GL_PROXY_POST_COLOR_MATRIX_COLOR_TABLE:
           table = &ctx->ProxyPostColorMatrixColorTable;
           break;
        default:
           _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTableParameteriv(target)");
           return;
     }
  
     assert(table);
  
     switch (pname) {
        case GL_COLOR_TABLE_FORMAT:
           *params = table->IntFormat;
           break;
        case GL_COLOR_TABLE_WIDTH:
           *params = table->Size;
           break;
        case GL_COLOR_TABLE_RED_SIZE:
           *params = table->RedSize;
           break;
        case GL_COLOR_TABLE_GREEN_SIZE:
           *params = table->GreenSize;
           break;
        case GL_COLOR_TABLE_BLUE_SIZE:
           *params = table->BlueSize;
           break;
        case GL_COLOR_TABLE_ALPHA_SIZE:
           *params = table->AlphaSize;
           break;
        case GL_COLOR_TABLE_LUMINANCE_SIZE:
           *params = table->LuminanceSize;
           break;
        case GL_COLOR_TABLE_INTENSITY_SIZE:
           *params = table->IntensitySize;
           break;
        default:
           _mesa_error(ctx, GL_INVALID_ENUM, "glGetColorTableParameteriv(pname)" );
           return;
     }
  }
  
  /**********************************************************************/
  /*****                      Initialization                        *****/
  /**********************************************************************/
  
  
  void
  _mesa_init_colortable( struct gl_color_table *p )
  {
     p->Type = CHAN_TYPE;
     p->Table = NULL;
     p->Size = 0;
     p->IntFormat = GL_RGBA;
  }
  
  
  
  void
  _mesa_free_colortable_data( struct gl_color_table *p )
  {
     if (p->Table) {
        FREE(p->Table);
        p->Table = NULL;
     }
  }
  
  
  /*
   * Initialize all colortables for a context.
   */
  void _mesa_init_colortables( GLcontext * ctx )
  {
     /* Color tables */
     _mesa_init_colortable(&ctx->ColorTable);
     _mesa_init_colortable(&ctx->ProxyColorTable);
     _mesa_init_colortable(&ctx->PostConvolutionColorTable);
     _mesa_init_colortable(&ctx->ProxyPostConvolutionColorTable);
     _mesa_init_colortable(&ctx->PostColorMatrixColorTable);
     _mesa_init_colortable(&ctx->ProxyPostColorMatrixColorTable);
  }
  
  
  /*
   * Free all colortable data for a context
   */
  void _mesa_free_colortables_data( GLcontext *ctx )
  {
     _mesa_free_colortable_data(&ctx->ColorTable);
     _mesa_free_colortable_data(&ctx->ProxyColorTable);
     _mesa_free_colortable_data(&ctx->PostConvolutionColorTable);
     _mesa_free_colortable_data(&ctx->ProxyPostConvolutionColorTable);
     _mesa_free_colortable_data(&ctx->PostColorMatrixColorTable);
     _mesa_free_colortable_data(&ctx->ProxyPostColorMatrixColorTable);
  }
  