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_fixedfunc_tex_unit(struct gl_context *ctx, GLuint unit)
65{
66   if (unit >= ARRAY_SIZE(ctx->Texture.FixedFuncUnit))
67      return NULL;
68
69   return &ctx->Texture.FixedFuncUnit[unit];
70}
71
72
73static inline GLuint
74_mesa_max_tex_unit(struct gl_context *ctx)
75{
76   /* See OpenGL spec for glActiveTexture: */
77   return MAX2(ctx->Const.MaxCombinedTextureImageUnits,
78               ctx->Const.MaxTextureCoordUnits);
79}
80
81
82extern void
83_mesa_copy_texture_state( const struct gl_context *src, struct gl_context *dst );
84
85extern void
86_mesa_print_texunit_state( struct gl_context *ctx, GLuint unit );
87
88
89
90/**
91 * \name Called from API
92 */
93/*@{*/
94
95extern void GLAPIENTRY
96_mesa_ActiveTexture_no_error( GLenum target );
97
98extern void GLAPIENTRY
99_mesa_ActiveTexture( GLenum target );
100
101extern void GLAPIENTRY
102_mesa_ClientActiveTexture( GLenum target );
103
104/*@}*/
105
106
107/**
108 * \name Initialization, state maintenance
109 */
110/*@{*/
111
112extern GLbitfield
113_mesa_update_texture_matrices(struct gl_context *ctx);
114
115extern GLbitfield
116_mesa_update_texture_state(struct gl_context *ctx);
117
118extern GLboolean
119_mesa_init_texture( struct gl_context *ctx );
120
121extern void
122_mesa_free_texture_data( struct gl_context *ctx );
123
124extern void
125_mesa_update_default_objects_texture(struct gl_context *ctx);
126
127/*@}*/
128
129#endif
130