texstate.h revision b8e80941 
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
40static 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 */
51static 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 */
63static 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
75static 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
84extern void
85_mesa_copy_texture_state( const struct gl_context *src, struct gl_context *dst );
86
87extern void
88_mesa_print_texunit_state( struct gl_context *ctx, GLuint unit );
89
90
91
92/**
93 * \name Called from API
94 */
95/*@{*/
96
97extern void GLAPIENTRY
98_mesa_ActiveTexture_no_error( GLenum target );
99
100extern void GLAPIENTRY
101_mesa_ActiveTexture( GLenum target );
102
103extern void GLAPIENTRY
104_mesa_ClientActiveTexture( GLenum target );
105
106/*@}*/
107
108
109/**
110 * \name Initialization, state maintenance
111 */
112/*@{*/
113
114extern void
115_mesa_update_texture_matrices(struct gl_context *ctx);
116
117extern void
118_mesa_update_texture_state(struct gl_context *ctx);
119
120extern GLboolean
121_mesa_init_texture( struct gl_context *ctx );
122
123extern void
124_mesa_free_texture_data( struct gl_context *ctx );
125
126extern void
127_mesa_update_default_objects_texture(struct gl_context *ctx);
128
129/*@}*/
130
131#endif
132