src/mesa/main/texcompress_fxt1.c

   1 /*
   2  * Mesa 3-D graphics library
   3  * Version:  6.1
   4  *
   5  * Copyright (C) 1999-2004  Brian Paul   All Rights Reserved.
   6  *
   7  * Permission is hereby granted, free of charge, to any person obtaining a
   8  * copy of this software and associated documentation files (the "Software"),
   9  * to deal in the Software without restriction, including without limitation
  10  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  11  * and/or sell copies of the Software, and to permit persons to whom the
  12  * Software is furnished to do so, subject to the following conditions:
  13  *
  14  * The above copyright notice and this permission notice shall be included
  15  * in all copies or substantial portions of the Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  18  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  21  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  22  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25
  26 /**
  27  * \file texcompress_fxt1.c
  28  * GL_EXT_texture_compression_fxt1 support.
  29  */
  30
  31
  32 #include "glheader.h"
  33 #include "imports.h"
  34 #include "colormac.h"
  35 #include "context.h"
  36 #include "convolve.h"
  37 #include "image.h"
  38 #include "texcompress.h"
  39 #include "texformat.h"
  40 #include "texstore.h"
  41
  42
  43 static GLuint
  44 compress_fxt1 (GLcontext *ctx,
  45                GLsizei srcWidth,
  46                GLsizei srcHeight,
  47                GLenum srcFormat,
  48                const GLchan *source,
  49                GLint srcRowStride,
  50                GLubyte *dest,
  51                GLint dstRowStride);
  52
  53
  54 /**
  55  * Called during context initialization.
  56  */
  57 void
  58 _mesa_init_texture_fxt1( GLcontext *ctx )
  59 {
  60 }
  61
  62
  63 /**
  64  * Called via TexFormat->StoreImage to store an RGB_FXT1 texture.
  65  */
  66 static GLboolean
  67 texstore_rgb_fxt1(STORE_PARAMS)
  68 {
  69    const GLchan *pixels;
  70    GLint srcRowStride;
  71    GLubyte *dst;
  72    const GLint texWidth = dstRowStride * 8 / 16; /* a bit of a hack */
  73    const GLchan *tempImage = NULL;
  74
  75    ASSERT(dstFormat == &_mesa_texformat_rgb_fxt1);
  76    ASSERT(dstXoffset % 8 == 0);
  77    ASSERT(dstYoffset % 4 == 0);
  78    ASSERT(dstZoffset     == 0);
  79
  80    /* [dBorca]
  81     * we still need to pass 4byte/texel to the codec
  82     */
  83    if (1 || srcFormat != GL_RGB ||
  84        srcType != CHAN_TYPE ||
  85        ctx->_ImageTransferState ||
  86        srcPacking->SwapBytes) {
  87       /* convert image to RGB/GLchan */
  88       tempImage = _mesa_make_temp_chan_image(ctx, dims,
  89                                              baseInternalFormat,
  90                                              /*dstFormat->BaseFormat*/GL_RGBA,
  91                                              srcWidth, srcHeight, srcDepth,
  92                                              srcFormat, srcType, srcAddr,
  93                                              srcPacking);
  94       if (!tempImage)
  95          return GL_FALSE; /* out of memory */
  96       _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
  97       pixels = tempImage;
  98       srcRowStride = /*3*/4 * srcWidth;
  99       srcFormat = GL_RGB;
 100    }
 101    else {
 102       pixels = (const GLchan *) srcAddr;
 103       srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
 104                                             srcType) / sizeof(GLchan);
 105    }
 106
 107    dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
 108                                         GL_COMPRESSED_RGB_FXT1_3DFX,
 109                                         texWidth, dstAddr);
 110
 111    compress_fxt1(ctx, srcWidth, srcHeight, srcFormat, pixels, srcRowStride,
 112                  dst, dstRowStride);
 113
 114    if (tempImage)
 115       _mesa_free((void *) tempImage);
 116
 117    return GL_TRUE;
 118 }
 119
 120
 121 /**
 122  * Called via TexFormat->StoreImage to store an RGBA_FXT1 texture.
 123  */
 124 static GLboolean
 125 texstore_rgba_fxt1(STORE_PARAMS)
 126 {
 127    const GLchan *pixels;
 128    GLint srcRowStride;
 129    GLubyte *dst;
 130    GLint texWidth = dstRowStride * 8 / 16; /* a bit of a hack */
 131    const GLchan *tempImage = NULL;
 132
 133    ASSERT(dstFormat == &_mesa_texformat_rgba_fxt1);
 134    ASSERT(dstXoffset % 8 == 0);
 135    ASSERT(dstYoffset % 4 == 0);
 136    ASSERT(dstZoffset     == 0);
 137
 138    if (srcFormat != GL_RGBA ||
 139        srcType != CHAN_TYPE ||
 140        ctx->_ImageTransferState ||
 141        srcPacking->SwapBytes) {
 142       /* convert image to RGBA/GLchan */
 143       tempImage = _mesa_make_temp_chan_image(ctx, dims,
 144                                              baseInternalFormat,
 145                                              dstFormat->BaseFormat,
 146                                              srcWidth, srcHeight, srcDepth,
 147                                              srcFormat, srcType, srcAddr,
 148                                              srcPacking);
 149       if (!tempImage)
 150          return GL_FALSE; /* out of memory */
 151       _mesa_adjust_image_for_convolution(ctx, dims, &srcWidth, &srcHeight);
 152       pixels = tempImage;
 153       srcRowStride = 4 * srcWidth;
 154       srcFormat = GL_RGBA;
 155    }
 156    else {
 157       pixels = (const GLchan *) srcAddr;
 158       srcRowStride = _mesa_image_row_stride(srcPacking, srcWidth, srcFormat,
 159                                             srcType) / sizeof(GLchan);
 160    }
 161
 162    dst = _mesa_compressed_image_address(dstXoffset, dstYoffset, 0,
 163                                         GL_COMPRESSED_RGBA_FXT1_3DFX,
 164                                         texWidth, dstAddr);
 165
 166    compress_fxt1(ctx, srcWidth, srcHeight, srcFormat, pixels, srcRowStride,
 167                  dst, dstRowStride);
 168
 169    if (tempImage)
 170       _mesa_free((void*) tempImage);
 171
 172    return GL_TRUE;
 173 }
 174
 175
 176 static void
 177 fetch_texel_2d_rgba_fxt1( const struct gl_texture_image *texImage,
 178                           GLint i, GLint j, GLint k, GLchan *texel )
 179 {
 180    /* XXX to do */
 181 }
 182
 183
 184 static void
 185 fetch_texel_2d_f_rgba_fxt1( const struct gl_texture_image *texImage,
 186                             GLint i, GLint j, GLint k, GLfloat *texel )
 187 {
 188    /* just sample as GLchan and convert to float here */
 189    GLchan rgba[4];
 190    fetch_texel_2d_rgba_fxt1(texImage, i, j, k, rgba);
 191    texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
 192    texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
 193    texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
 194    texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
 195 }
 196
 197
 198 static void
 199 fetch_texel_2d_rgb_fxt1( const struct gl_texture_image *texImage,
 200                          GLint i, GLint j, GLint k, GLchan *texel )
 201 {
 202    /* XXX to do */
 203 }
 204
 205
 206 static void
 207 fetch_texel_2d_f_rgb_fxt1( const struct gl_texture_image *texImage,
 208                            GLint i, GLint j, GLint k, GLfloat *texel )
 209 {
 210    /* just sample as GLchan and convert to float here */
 211    GLchan rgba[4];
 212    fetch_texel_2d_rgb_fxt1(texImage, i, j, k, rgba);
 213    texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
 214    texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
 215    texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
 216    texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
 217 }
 218
 219
 220
 221 const struct gl_texture_format _mesa_texformat_rgb_fxt1 = {
 222    MESA_FORMAT_RGB_FXT1,                /* MesaFormat */
 223    GL_RGB,                              /* BaseFormat */
 224    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 225    4, /*approx*/                        /* RedBits */
 226    4, /*approx*/                        /* GreenBits */
 227    4, /*approx*/                        /* BlueBits */
 228    0,                                   /* AlphaBits */
 229    0,                                   /* LuminanceBits */
 230    0,                                   /* IntensityBits */
 231    0,                                   /* IndexBits */
 232    0,                                   /* DepthBits */
 233    0,                                   /* TexelBytes */
 234    texstore_rgb_fxt1,                   /* StoreTexImageFunc */
 235    NULL, /*impossible*/                 /* FetchTexel1D */
 236    fetch_texel_2d_rgb_fxt1,             /* FetchTexel2D */
 237    NULL, /*impossible*/                 /* FetchTexel3D */
 238    NULL, /*impossible*/                 /* FetchTexel1Df */
 239    fetch_texel_2d_f_rgb_fxt1,           /* FetchTexel2Df */
 240    NULL, /*impossible*/                 /* FetchTexel3Df */
 241 };
 242
 243 const struct gl_texture_format _mesa_texformat_rgba_fxt1 = {
 244    MESA_FORMAT_RGBA_FXT1,               /* MesaFormat */
 245    GL_RGBA,                             /* BaseFormat */
 246    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 247    4, /*approx*/                        /* RedBits */
 248    4, /*approx*/                        /* GreenBits */
 249    4, /*approx*/                        /* BlueBits */
 250    1, /*approx*/                        /* AlphaBits */
 251    0,                                   /* LuminanceBits */
 252    0,                                   /* IntensityBits */
 253    0,                                   /* IndexBits */
 254    0,                                   /* DepthBits */
 255    0,                                   /* TexelBytes */
 256    texstore_rgba_fxt1,                  /* StoreTexImageFunc */
 257    NULL, /*impossible*/                 /* FetchTexel1D */
 258    fetch_texel_2d_rgba_fxt1,            /* FetchTexel2D */
 259    NULL, /*impossible*/                 /* FetchTexel3D */
 260    NULL, /*impossible*/                 /* FetchTexel1Df */
 261    fetch_texel_2d_f_rgba_fxt1,          /* FetchTexel2Df */
 262    NULL, /*impossible*/                 /* FetchTexel3Df */
 263 };
 264
 265
 266 static GLuint
 267 compress_fxt1 (GLcontext *ctx,
 268                GLsizei srcWidth,
 269                GLsizei srcHeight,
 270                GLenum srcFormat,
 271                const GLchan *source,
 272                GLint srcRowStride,
 273                GLubyte *dest,
 274                GLint dstRowStride)
 275 {
 276    /* here be dragons */
 277    return -1;
 278 }