1 /**
2 * \file blend.h
3 * Blending functions operations.
4 */
5
6 /*
7 * Mesa 3-D graphics library
8 *
9 * Copyright (C) 1999-2006 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
32 #ifndef BLEND_H
33 #define BLEND_H
34
35
36 #include "util/glheader.h"
37 #include "context.h"
38 #include "formats.h"
39 #include "extensions.h"
40
41 #include "state_tracker/st_context.h"
42
43 struct gl_context;
44 struct gl_framebuffer;
45
46 extern GLboolean
47 _mesa_get_clamp_fragment_color(const struct gl_context *ctx,
48 const struct gl_framebuffer *drawFb);
49
50 extern GLboolean
51 _mesa_get_clamp_vertex_color(const struct gl_context *ctx,
52 const struct gl_framebuffer *drawFb);
53
54 extern GLboolean
55 _mesa_get_clamp_read_color(const struct gl_context *ctx,
56 const struct gl_framebuffer *readFb);
57
58 extern void
59 _mesa_update_clamp_fragment_color(struct gl_context *ctx,
60 const struct gl_framebuffer *drawFb);
61
62 extern void
63 _mesa_update_clamp_vertex_color(struct gl_context *ctx,
64 const struct gl_framebuffer *drawFb);
65
66 extern void
67 _mesa_init_color( struct gl_context * ctx );
68
69
70 static inline enum gl_advanced_blend_mode
_mesa_get_advanced_blend_sh_constant(GLbitfield blend_enabled,enum gl_advanced_blend_mode mode)71 _mesa_get_advanced_blend_sh_constant(GLbitfield blend_enabled,
72 enum gl_advanced_blend_mode mode)
73 {
74 return blend_enabled ? mode : BLEND_NONE;
75 }
76
77 static inline bool
_mesa_advanded_blend_sh_constant_changed(struct gl_context * ctx,GLbitfield new_blend_enabled,enum gl_advanced_blend_mode new_mode)78 _mesa_advanded_blend_sh_constant_changed(struct gl_context *ctx,
79 GLbitfield new_blend_enabled,
80 enum gl_advanced_blend_mode new_mode)
81 {
82 return _mesa_get_advanced_blend_sh_constant(new_blend_enabled, new_mode) !=
83 _mesa_get_advanced_blend_sh_constant(ctx->Color.BlendEnabled,
84 ctx->Color._AdvancedBlendMode);
85 }
86
87 static inline void
_mesa_flush_vertices_for_blend_state(struct gl_context * ctx)88 _mesa_flush_vertices_for_blend_state(struct gl_context *ctx)
89 {
90 FLUSH_VERTICES(ctx, 0, GL_COLOR_BUFFER_BIT);
91 ctx->NewDriverState |= ST_NEW_BLEND;
92 }
93
94 static inline void
_mesa_flush_vertices_for_blend_adv(struct gl_context * ctx,GLbitfield new_blend_enabled,enum gl_advanced_blend_mode new_mode)95 _mesa_flush_vertices_for_blend_adv(struct gl_context *ctx,
96 GLbitfield new_blend_enabled,
97 enum gl_advanced_blend_mode new_mode)
98 {
99 /* The advanced blend mode needs _NEW_COLOR to update the state constant. */
100 if (_mesa_has_KHR_blend_equation_advanced(ctx) &&
101 _mesa_advanded_blend_sh_constant_changed(ctx, new_blend_enabled,
102 new_mode)) {
103 FLUSH_VERTICES(ctx, _NEW_COLOR, GL_COLOR_BUFFER_BIT);
104 ctx->NewDriverState |= ST_NEW_BLEND;
105 return;
106 }
107 _mesa_flush_vertices_for_blend_state(ctx);
108 }
109
110 static inline GLbitfield
_mesa_replicate_colormask(GLbitfield mask0,unsigned num_buffers)111 _mesa_replicate_colormask(GLbitfield mask0, unsigned num_buffers)
112 {
113 GLbitfield mask = mask0;
114
115 for (unsigned i = 1; i < num_buffers; i++)
116 mask |= mask0 << (i * 4);
117 return mask;
118 }
119
120 #endif
121