src/mesa/main/texstate.h

   1 /**
   2  * \file texstate.h
   3  * Texture state management.
   4  */
   5
   6 /*
   7  * Mesa 3-D graphics library
   8  *
   9  * Copyright (C) 1999-2007  Brian Paul   All Rights Reserved.
  10  *
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included
  19  * in all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  22  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  24  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  25  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  26  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  27  * OTHER DEALINGS IN THE SOFTWARE.
  28  */
  29
  30
  31 #ifndef TEXSTATE_H
  32 #define TEXSTATE_H
  33
  34
  35 #include "enums.h"
  36 #include "macros.h"
  37 #include "mtypes.h"
  38
  39
  40 static inline struct gl_texture_unit *
  41 _mesa_get_tex_unit(struct gl_context *ctx, GLuint unit)
  42 {
  43    assert(unit < ARRAY_SIZE(ctx->Texture.Unit));
  44    return &(ctx->Texture.Unit[unit]);
  45 }
  46
  47 /**
  48  * Return pointer to current texture unit.
  49  * This the texture unit set by glActiveTexture(), not glClientActiveTexture().
  50  */
  51 static inline struct gl_texture_unit *
  52 _mesa_get_current_tex_unit(struct gl_context *ctx)
  53 {
  54    return _mesa_get_tex_unit(ctx, ctx->Texture.CurrentUnit);
  55 }
  56
  57
  58 /**
  59  * Return pointer to current fixed-func texture unit.
  60  * This the texture unit set by glActiveTexture(), not glClientActiveTexture().
  61  * \return NULL if the current unit is not a fixed-func texture unit
  62  */
  63 static inline struct gl_fixedfunc_texture_unit *
  64 _mesa_get_current_fixedfunc_tex_unit(struct gl_context *ctx)
  65 {
  66    unsigned unit = ctx->Texture.CurrentUnit;
  67
  68    if (unit >= ARRAY_SIZE(ctx->Texture.FixedFuncUnit))
  69       return NULL;
  70
  71    return &ctx->Texture.FixedFuncUnit[unit];
  72 }
  73
  74
  75 static inline GLuint
  76 _mesa_max_tex_unit(struct gl_context *ctx)
  77 {
  78    /* See OpenGL spec for glActiveTexture: */
  79    return MAX2(ctx->Const.MaxCombinedTextureImageUnits,
  80                ctx->Const.MaxTextureCoordUnits);
  81 }
  82
  83
  84 extern void
  85 _mesa_copy_texture_state( const struct gl_context *src, struct gl_context *dst );
  86
  87 extern void
  88 _mesa_print_texunit_state( struct gl_context *ctx, GLuint unit );
  89
  90
  91
  92 /**
  93  * \name Called from API
  94  */
  95 /*@{*/
  96
  97 extern void GLAPIENTRY
  98 _mesa_ActiveTexture_no_error( GLenum target );
  99
 100 extern void GLAPIENTRY
 101 _mesa_ActiveTexture( GLenum target );
 102
 103 extern void GLAPIENTRY
 104 _mesa_ClientActiveTexture( GLenum target );
 105
 106 /*@}*/
 107
 108
 109 /**
 110  * \name Initialization, state maintenance
 111  */
 112 /*@{*/
 113
 114 extern void
 115 _mesa_update_texture_matrices(struct gl_context *ctx);
 116
 117 extern void
 118 _mesa_update_texture_state(struct gl_context *ctx);
 119
 120 extern GLboolean
 121 _mesa_init_texture( struct gl_context *ctx );
 122
 123 extern void
 124 _mesa_free_texture_data( struct gl_context *ctx );
 125
 126 extern void
 127 _mesa_update_default_objects_texture(struct gl_context *ctx);
 128
 129 /*@}*/
 130
 131 #endif