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/* $Id: texformat.h,v 1.1 2003-02-28 11:42:05 pj Exp $ */
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/*
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 * Mesa 3-D graphics library
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 * Version:  4.1
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 *
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 * Copyright (C) 1999-2002  Brian Paul   All Rights Reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a
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 * copy of this software and associated documentation files (the "Software"),
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 * to deal in the Software without restriction, including without limitation
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 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
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 * and/or sell copies of the Software, and to permit persons to whom the
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 * Software is furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included
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 * in all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
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 * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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 * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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 *
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 * Author:
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 *    Gareth Hughes
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 */
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#ifndef TEXFORMAT_H
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#define TEXFORMAT_H
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#include "mtypes.h"
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/*
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 * The Mesa internal texture image types.
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 * All texture images must be stored in one of these formats.
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 */
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enum _format {
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   /* Hardware-friendly formats.  Drivers can override the default
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    * formats and convert texture images to one of these as required.
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    * The driver's ChooseTextureFormat() function will choose one of
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    * these formats.
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    * These formats are all little endian, as shown below.  They will be
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    * most useful for x86-based PC graphics card drivers.
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    *
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    * NOTE: In the default case, some of these formats will be
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    * duplicates of the generic formats listed below.  However, these
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    * formats guarantee their internal component sizes, while GLchan may
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    * vary betwen GLubyte, GLushort and GLfloat.
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    */
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                                /* msb <------ TEXEL BITS -----------> lsb */
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                                /* ---- ---- ---- ---- ---- ---- ---- ---- */
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   MESA_FORMAT_RGBA8888,        /* RRRR RRRR GGGG GGGG BBBB BBBB AAAA AAAA */
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   MESA_FORMAT_ARGB8888,        /* AAAA AAAA RRRR RRRR GGGG GGGG BBBB BBBB */
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   MESA_FORMAT_RGB888,          /*           RRRR RRRR GGGG GGGG BBBB BBBB */
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   MESA_FORMAT_RGB565,          /*                     RRRR RGGG GGGB BBBB */
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   MESA_FORMAT_ARGB4444,        /*                     AAAA RRRR GGGG BBBB */
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   MESA_FORMAT_ARGB1555,        /*                     ARRR RRGG GGGB BBBB */
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   MESA_FORMAT_AL88,            /*                     AAAA AAAA LLLL LLLL */
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   MESA_FORMAT_RGB332,          /*                               RRRG GGBB */
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   MESA_FORMAT_A8,              /*                               AAAA AAAA */
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   MESA_FORMAT_L8,              /*                               LLLL LLLL */
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   MESA_FORMAT_I8,              /*                               IIII IIII */
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   MESA_FORMAT_CI8,             /*                               CCCC CCCC */
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   MESA_FORMAT_YCBCR,           /*                     YYYY YYYY UorV UorV */
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   MESA_FORMAT_YCBCR_REV,       /*                     UorV UorV YYYY YYYY */
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#if 0
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   /* upcoming little-endian formats: */
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                                /* msb <------ TEXEL BITS -----------> lsb */
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                                /* ---- ---- ---- ---- ---- ---- ---- ---- */
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   MESA_FORMAT_ABGR8888,        /* AAAA AAAA BBBB BBBB GGGG GGGG RRRR RRRR */
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   MESA_FORMAT_BGRA8888,        /* BBBB BBBB GGGG GGGG RRRR RRRR AAAA AAAA */
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   MESA_FORMAT_BGR888,          /*           BBBB BBBB GGGG GGGG RRRR RRRR */
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   MESA_FORMAT_BGR565,          /*                     BBBB BGGG GGGR RRRR */
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   MESA_FORMAT_BGRA4444,        /*                     BBBB GGGG RRRR AAAA */
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   MESA_FORMAT_BGRA5551,        /*                     BBBB BGGG GGRR RRRA */
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   MESA_FORMAT_LA88,            /*                     LLLL LLLL AAAA AAAA */
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   MESA_FORMAT_BGR233,          /*                               BBGG GRRR */
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#endif
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   /* Generic GLchan-based formats.  These are the default formats used
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    * by the software rasterizer and, unless the driver overrides the
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    * texture image functions, incoming images will be converted to one
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    * of these formats.  Components are arrays of GLchan values, so
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    * there will be no big/little endian issues.
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    *
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    * NOTE: Because these are based on the GLchan datatype, one cannot
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    * assume 8 bits per channel with these formats.  If you require
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    * GLubyte channels, use one of the hardware formats above.
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    */
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   MESA_FORMAT_RGBA,
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   MESA_FORMAT_RGB,
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   MESA_FORMAT_ALPHA,
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   MESA_FORMAT_LUMINANCE,
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   MESA_FORMAT_LUMINANCE_ALPHA,
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   MESA_FORMAT_INTENSITY,
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   MESA_FORMAT_COLOR_INDEX,
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   MESA_FORMAT_DEPTH_COMPONENT
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};
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extern GLboolean
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_mesa_is_hardware_tex_format( const struct gl_texture_format *format );
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extern const struct gl_texture_format *
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_mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
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                         GLenum format, GLenum type );
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extern GLint
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_mesa_base_compressed_texformat(GLcontext *ctx, GLint intFormat);
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/* The default formats, GLchan per component:
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 */
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extern const struct gl_texture_format _mesa_texformat_rgba;
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extern const struct gl_texture_format _mesa_texformat_rgb;
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extern const struct gl_texture_format _mesa_texformat_alpha;
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extern const struct gl_texture_format _mesa_texformat_luminance;
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extern const struct gl_texture_format _mesa_texformat_luminance_alpha;
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extern const struct gl_texture_format _mesa_texformat_intensity;
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extern const struct gl_texture_format _mesa_texformat_color_index;
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extern const struct gl_texture_format _mesa_texformat_depth_component;
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/* The hardware-friendly formats:
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 */
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extern const struct gl_texture_format _mesa_texformat_rgba8888;
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extern const struct gl_texture_format _mesa_texformat_argb8888;
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extern const struct gl_texture_format _mesa_texformat_rgb888;
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extern const struct gl_texture_format _mesa_texformat_rgb565;
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extern const struct gl_texture_format _mesa_texformat_argb4444;
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extern const struct gl_texture_format _mesa_texformat_argb1555;
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extern const struct gl_texture_format _mesa_texformat_al88;
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extern const struct gl_texture_format _mesa_texformat_rgb332;
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extern const struct gl_texture_format _mesa_texformat_a8;
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extern const struct gl_texture_format _mesa_texformat_l8;
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extern const struct gl_texture_format _mesa_texformat_i8;
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extern const struct gl_texture_format _mesa_texformat_ci8;
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extern const struct gl_texture_format _mesa_texformat_ycbcr;
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extern const struct gl_texture_format _mesa_texformat_ycbcr_rev;
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/* The null format:
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 */
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extern const struct gl_texture_format _mesa_null_texformat;
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#endif