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 void
  44 _mesa_init_texture_fxt1( GLcontext *ctx )
  45 {
  46    /* called during context initialization */
  47 }
  48
  49
  50 static GLboolean
  51 texstore_rgb_fxt1(STORE_PARAMS)
  52 {
  53    /* XXX to do */
  54    return GL_FALSE;
  55 }
  56
  57
  58 static GLboolean
  59 texstore_rgba_fxt1(STORE_PARAMS)
  60 {
  61    /* XXX to do */
  62    return GL_FALSE;
  63 }
  64
  65
  66
  67 static void
  68 fetch_texel_2d_rgba_fxt1( const struct gl_texture_image *texImage,
  69                           GLint i, GLint j, GLint k, GLchan *texel )
  70 {
  71    /* XXX to do */
  72 }
  73
  74
  75 static void
  76 fetch_texel_2d_f_rgba_fxt1( const struct gl_texture_image *texImage,
  77                             GLint i, GLint j, GLint k, GLfloat *texel )
  78 {
  79    /* just sample as GLchan and convert to float here */
  80    GLchan rgba[4];
  81    fetch_texel_2d_rgba_fxt1(texImage, i, j, k, rgba);
  82    texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
  83    texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
  84    texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
  85    texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
  86 }
  87
  88
  89 static void
  90 fetch_texel_2d_rgb_fxt1( const struct gl_texture_image *texImage,
  91                          GLint i, GLint j, GLint k, GLchan *texel )
  92 {
  93    /* XXX to do */
  94 }
  95
  96
  97 static void
  98 fetch_texel_2d_f_rgb_fxt1( const struct gl_texture_image *texImage,
  99                            GLint i, GLint j, GLint k, GLfloat *texel )
 100 {
 101    /* just sample as GLchan and convert to float here */
 102    GLchan rgba[4];
 103    fetch_texel_2d_rgb_fxt1(texImage, i, j, k, rgba);
 104    texel[RCOMP] = CHAN_TO_FLOAT(rgba[RCOMP]);
 105    texel[GCOMP] = CHAN_TO_FLOAT(rgba[GCOMP]);
 106    texel[BCOMP] = CHAN_TO_FLOAT(rgba[BCOMP]);
 107    texel[ACOMP] = CHAN_TO_FLOAT(rgba[ACOMP]);
 108 }
 109
 110
 111
 112 const struct gl_texture_format _mesa_texformat_rgb_fxt1 = {
 113    MESA_FORMAT_RGB_FXT1,                /* MesaFormat */
 114    GL_RGB,                              /* BaseFormat */
 115    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 116    4, /*approx*/                        /* RedBits */
 117    4, /*approx*/                        /* GreenBits */
 118    4, /*approx*/                        /* BlueBits */
 119    0,                                   /* AlphaBits */
 120    0,                                   /* LuminanceBits */
 121    0,                                   /* IntensityBits */
 122    0,                                   /* IndexBits */
 123    0,                                   /* DepthBits */
 124    0,                                   /* TexelBytes */
 125    texstore_rgb_fxt1,                   /* StoreTexImageFunc */
 126    NULL, /*impossible*/                 /* FetchTexel1D */
 127    fetch_texel_2d_rgb_fxt1,             /* FetchTexel2D */
 128    NULL, /*impossible*/                 /* FetchTexel3D */
 129    NULL, /*impossible*/                 /* FetchTexel1Df */
 130    fetch_texel_2d_f_rgb_fxt1,           /* FetchTexel2Df */
 131    NULL, /*impossible*/                 /* FetchTexel3Df */
 132 };
 133
 134 const struct gl_texture_format _mesa_texformat_rgba_fxt1 = {
 135    MESA_FORMAT_RGBA_FXT1,               /* MesaFormat */
 136    GL_RGBA,                             /* BaseFormat */
 137    GL_UNSIGNED_NORMALIZED_ARB,          /* DataType */
 138    4, /*approx*/                        /* RedBits */
 139    4, /*approx*/                        /* GreenBits */
 140    4, /*approx*/                        /* BlueBits */
 141    1, /*approx*/                        /* AlphaBits */
 142    0,                                   /* LuminanceBits */
 143    0,                                   /* IntensityBits */
 144    0,                                   /* IndexBits */
 145    0,                                   /* DepthBits */
 146    0,                                   /* TexelBytes */
 147    texstore_rgba_fxt1,                  /* StoreTexImageFunc */
 148    NULL, /*impossible*/                 /* FetchTexel1D */
 149    fetch_texel_2d_rgba_fxt1,            /* FetchTexel2D */
 150    NULL, /*impossible*/                 /* FetchTexel3D */
 151    NULL, /*impossible*/                 /* FetchTexel1Df */
 152    fetch_texel_2d_f_rgba_fxt1,          /* FetchTexel2Df */
 153    NULL, /*impossible*/                 /* FetchTexel3Df */
 154 };
 155