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/* $Id: texformat.h,v 1.6 2001/04/04 21:54:21 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 3.5
*
* Copyright (C) 1999-2001 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.
*
* Author:
* Gareth Hughes <gareth@valinux.com>
*/
#ifndef TEXFORMAT_H
#define TEXFORMAT_H
#include "mtypes.h"
/* The Mesa internal texture image types. These will be set to their
* default value, but may be changed by drivers as required.
*/
enum _format {
/* Hardware-friendly formats. Drivers can override the default
* formats and convert texture images to one of these as required.
* These formats are all little endian, as shown below. They will be
* most useful for x86-based PC graphics card drivers.
*
* NOTE: In the default case, some of these formats will be
* duplicates of the default formats listed above. However, these
* formats guarantee their internal component sizes, while GLchan may
* vary betwen GLubyte, GLushort and GLfloat.
*/
/* msb <------ TEXEL BITS -----------> lsb */
/* ---- ---- ---- ---- ---- ---- ---- ---- */
MESA_FORMAT_RGBA8888, /* RRRR RRRR GGGG GGGG BBBB BBBB AAAA AAAA */
MESA_FORMAT_ARGB8888, /* AAAA AAAA RRRR RRRR GGGG GGGG BBBB BBBB */
MESA_FORMAT_RGB888, /* RRRR RRRR GGGG GGGG BBBB BBBB */
MESA_FORMAT_RGB565, /* RRRR RGGG GGGB BBBB */
MESA_FORMAT_ARGB4444, /* AAAA RRRR GGGG BBBB */
MESA_FORMAT_ARGB1555, /* ARRR RRGG GGGB BBBB */
MESA_FORMAT_AL88, /* AAAA AAAA LLLL LLLL */
MESA_FORMAT_RGB332, /* RRRG GGBB */
MESA_FORMAT_A8, /* AAAA AAAA */
MESA_FORMAT_L8, /* LLLL LLLL */
MESA_FORMAT_I8, /* IIII IIII */
MESA_FORMAT_CI8, /* CCCC CCCC */
/* Generic GLchan-based formats. These are the default formats used
* by the software rasterizer and, unless the driver overrides the
* texture image functions, incoming images will be converted to one
* of these formats. Components are arrays of GLchan values, so
* there will be no big/little endian issues.
*
* NOTE: Because these are based on the GLchan datatype, one cannot
* assume 8 bits per channel with these formats. If you require
* GLubyte per channel, use one of the hardware formats below.
*/
MESA_FORMAT_RGBA,
MESA_FORMAT_RGB,
MESA_FORMAT_ALPHA,
MESA_FORMAT_LUMINANCE,
MESA_FORMAT_LUMINANCE_ALPHA,
MESA_FORMAT_INTENSITY,
MESA_FORMAT_COLOR_INDEX,
MESA_FORMAT_DEPTH_COMPONENT
};
extern GLboolean
_mesa_is_hardware_tex_format( const struct gl_texture_format *format );
extern const struct gl_texture_format *
_mesa_choose_tex_format( GLcontext *ctx, GLint internalFormat,
GLenum format, GLenum type );
/* The default formats, GLchan per component:
*/
extern const struct gl_texture_format _mesa_texformat_rgba;
extern const struct gl_texture_format _mesa_texformat_rgb;
extern const struct gl_texture_format _mesa_texformat_alpha;
extern const struct gl_texture_format _mesa_texformat_luminance;
extern const struct gl_texture_format _mesa_texformat_luminance_alpha;
extern const struct gl_texture_format _mesa_texformat_intensity;
extern const struct gl_texture_format _mesa_texformat_color_index;
extern const struct gl_texture_format _mesa_texformat_depth_component;
/* The hardware-friendly formats:
*/
extern const struct gl_texture_format _mesa_texformat_rgba8888;
extern const struct gl_texture_format _mesa_texformat_argb8888;
extern const struct gl_texture_format _mesa_texformat_rgb888;
extern const struct gl_texture_format _mesa_texformat_rgb565;
extern const struct gl_texture_format _mesa_texformat_argb4444;
extern const struct gl_texture_format _mesa_texformat_argb1555;
extern const struct gl_texture_format _mesa_texformat_al88;
extern const struct gl_texture_format _mesa_texformat_rgb332;
extern const struct gl_texture_format _mesa_texformat_a8;
extern const struct gl_texture_format _mesa_texformat_l8;
extern const struct gl_texture_format _mesa_texformat_i8;
extern const struct gl_texture_format _mesa_texformat_ci8;
/* The null format:
*/
extern const struct gl_texture_format _mesa_null_texformat;
#endif
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