src/mesa/main/texformat.h

   1 /* $Id: texformat.h,v 1.6 2001/04/04 21:54:21 brianp Exp $ */
   2
   3 /*
   4  * Mesa 3-D graphics library
   5  * Version:  3.5
   6  *
   7  * Copyright (C) 1999-2001  Brian Paul   All Rights Reserved.
   8  *
   9  * Permission is hereby granted, free of charge, to any person obtaining a
  10  * copy of this software and associated documentation files (the "Software"),
  11  * to deal in the Software without restriction, including without limitation
  12  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  13  * and/or sell copies of the Software, and to permit persons to whom the
  14  * Software is furnished to do so, subject to the following conditions:
  15  *
  16  * The above copyright notice and this permission notice shall be included
  17  * in all copies or substantial portions of the Software.
  18  *
  19  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  20  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  21  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  22  * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  23  * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  24  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  25  *
  26  * Author:
  27  *    Gareth Hughes <gareth@valinux.com>
  28  */
  29
  30 #ifndef TEXFORMAT_H
  31 #define TEXFORMAT_H
  32
  33 #include "mtypes.h"
  34
  35
  36 /* The Mesa internal texture image types.  These will be set to their
  37  * default value, but may be changed by drivers as required.
  38  */
  39 enum _format {
  40    /* Hardware-friendly formats.  Drivers can override the default
  41     * formats and convert texture images to one of these as required.
  42     * These formats are all little endian, as shown below.  They will be
  43     * most useful for x86-based PC graphics card drivers.
  44     *
  45     * NOTE: In the default case, some of these formats will be
  46     * duplicates of the default formats listed above.  However, these
  47     * formats guarantee their internal component sizes, while GLchan may
  48     * vary betwen GLubyte, GLushort and GLfloat.
  49     */
  50                                 /* msb <------ TEXEL BITS -----------> lsb */
  51                                 /* ---- ---- ---- ---- ---- ---- ---- ---- */
  52    MESA_FORMAT_RGBA8888,        /* RRRR RRRR GGGG GGGG BBBB BBBB AAAA AAAA */
  53    MESA_FORMAT_ARGB8888,        /* AAAA AAAA RRRR RRRR GGGG GGGG BBBB BBBB */
  54    MESA_FORMAT_RGB888,          /*           RRRR RRRR GGGG GGGG BBBB BBBB */
  55    MESA_FORMAT_RGB565,          /*                     RRRR RGGG GGGB BBBB */
  56    MESA_FORMAT_ARGB4444,        /*                     AAAA RRRR GGGG BBBB */
  57    MESA_FORMAT_ARGB1555,        /*                     ARRR RRGG GGGB BBBB */
  58    MESA_FORMAT_AL88,            /*                     AAAA AAAA LLLL LLLL */
  59    MESA_FORMAT_RGB332,          /*                               RRRG GGBB */
  60    MESA_FORMAT_A8,              /*                               AAAA AAAA */
  61    MESA_FORMAT_L8,              /*                               LLLL LLLL */
  62    MESA_FORMAT_I8,              /*                               IIII IIII */
  63    MESA_FORMAT_CI8,             /*                               CCCC CCCC */
  64
  65    /* Generic GLchan-based formats.  These are the default formats used
  66     * by the software rasterizer and, unless the driver overrides the
  67     * texture image functions, incoming images will be converted to one
  68     * of these formats.  Components are arrays of GLchan values, so
  69     * there will be no big/little endian issues.
  70     *
  71     * NOTE: Because these are based on the GLchan datatype, one cannot
  72     * assume 8 bits per channel with these formats.  If you require
  73     * GLubyte per channel, use one of the hardware formats below.
  74     */
  75    MESA_FORMAT_RGBA,
  76    MESA_FORMAT_RGB,
  77    MESA_FORMAT_ALPHA,
  78    MESA_FORMAT_LUMINANCE,
  79    MESA_FORMAT_LUMINANCE_ALPHA,
  80    MESA_FORMAT_INTENSITY,
  81    MESA_FORMAT_COLOR_INDEX,
  82    MESA_FORMAT_DEPTH_COMPONENT
  83 };
  84
  85
  86 extern GLboolean
  87 _mesa_is_hardware_tex_format( const struct gl_texture_format *format );
  88
  89 extern const struct gl_texture_format *
  90 _mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
  91                          GLenum format, GLenum type );
  92
  93
  94 /* The default formats, GLchan per component:
  95  */
  96 extern const struct gl_texture_format _mesa_texformat_rgba;
  97 extern const struct gl_texture_format _mesa_texformat_rgb;
  98 extern const struct gl_texture_format _mesa_texformat_alpha;
  99 extern const struct gl_texture_format _mesa_texformat_luminance;
 100 extern const struct gl_texture_format _mesa_texformat_luminance_alpha;
 101 extern const struct gl_texture_format _mesa_texformat_intensity;
 102 extern const struct gl_texture_format _mesa_texformat_color_index;
 103 extern const struct gl_texture_format _mesa_texformat_depth_component;
 104
 105 /* The hardware-friendly formats:
 106  */
 107 extern const struct gl_texture_format _mesa_texformat_rgba8888;
 108 extern const struct gl_texture_format _mesa_texformat_argb8888;
 109 extern const struct gl_texture_format _mesa_texformat_rgb888;
 110 extern const struct gl_texture_format _mesa_texformat_rgb565;
 111 extern const struct gl_texture_format _mesa_texformat_argb4444;
 112 extern const struct gl_texture_format _mesa_texformat_argb1555;
 113 extern const struct gl_texture_format _mesa_texformat_al88;
 114 extern const struct gl_texture_format _mesa_texformat_rgb332;
 115 extern const struct gl_texture_format _mesa_texformat_a8;
 116 extern const struct gl_texture_format _mesa_texformat_l8;
 117 extern const struct gl_texture_format _mesa_texformat_i8;
 118 extern const struct gl_texture_format _mesa_texformat_ci8;
 119
 120 /* The null format:
 121  */
 122 extern const struct gl_texture_format _mesa_null_texformat;
 123
 124 #endif