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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 "glheader.h"
37 #include "context.h"
38 #include "formats.h"
39 #include "extensions.h"
40 
41 struct gl_context;
42 struct gl_framebuffer;
43 
44 
45 extern void GLAPIENTRY
46 _mesa_BlendFunc( GLenum sfactor, GLenum dfactor );
47 
48 extern void GLAPIENTRY
49 _mesa_BlendFunc_no_error(GLenum sfactor, GLenum dfactor);
50 
51 extern void GLAPIENTRY
52 _mesa_BlendFuncSeparate( GLenum sfactorRGB, GLenum dfactorRGB,
53                             GLenum sfactorA, GLenum dfactorA );
54 
55 extern void GLAPIENTRY
56 _mesa_BlendFuncSeparate_no_error(GLenum sfactorRGB, GLenum dfactorRGB,
57                                  GLenum sfactorA, GLenum dfactorA);
58 
59 extern void GLAPIENTRY
60 _mesa_BlendFunciARB_no_error(GLuint buf, GLenum sfactor, GLenum dfactor);
61 extern void GLAPIENTRY
62 _mesa_BlendFunciARB(GLuint buf, GLenum sfactor, GLenum dfactor);
63 
64 
65 extern void GLAPIENTRY
66 _mesa_BlendFuncSeparateiARB_no_error(GLuint buf, GLenum sfactorRGB,
67                                      GLenum dfactorRGB, GLenum sfactorA,
68                                      GLenum dfactorA);
69 extern void GLAPIENTRY
70 _mesa_BlendFuncSeparateiARB(GLuint buf, GLenum sfactorRGB, GLenum dfactorRGB,
71                          GLenum sfactorA, GLenum dfactorA);
72 
73 
74 extern void GLAPIENTRY
75 _mesa_BlendEquation( GLenum mode );
76 
77 
78 void GLAPIENTRY
79 _mesa_BlendEquationiARB_no_error(GLuint buf, GLenum mode);
80 
81 extern void GLAPIENTRY
82 _mesa_BlendEquationiARB(GLuint buf, GLenum mode);
83 
84 
85 void GLAPIENTRY
86 _mesa_BlendEquationSeparate_no_error(GLenum modeRGB, GLenum modeA);
87 
88 extern void GLAPIENTRY
89 _mesa_BlendEquationSeparate( GLenum modeRGB, GLenum modeA );
90 
91 
92 extern void GLAPIENTRY
93 _mesa_BlendEquationSeparateiARB_no_error(GLuint buf, GLenum modeRGB,
94                                          GLenum modeA);
95 extern void GLAPIENTRY
96 _mesa_BlendEquationSeparateiARB(GLuint buf, GLenum modeRGB, GLenum modeA);
97 
98 
99 extern void GLAPIENTRY
100 _mesa_BlendColor(GLclampf red, GLclampf green, GLclampf blue, GLclampf alpha);
101 
102 
103 extern void GLAPIENTRY
104 _mesa_AlphaFunc( GLenum func, GLclampf ref );
105 
106 
107 extern void GLAPIENTRY
108 _mesa_LogicOp( GLenum opcode );
109 
110 
111 extern void GLAPIENTRY
112 _mesa_LogicOp_no_error(GLenum opcode);
113 
114 
115 extern void GLAPIENTRY
116 _mesa_IndexMask( GLuint mask );
117 
118 extern void GLAPIENTRY
119 _mesa_ColorMask( GLboolean red, GLboolean green,
120                  GLboolean blue, GLboolean alpha );
121 
122 extern void GLAPIENTRY
123 _mesa_ColorMaski( GLuint buf, GLboolean red, GLboolean green,
124                         GLboolean blue, GLboolean alpha );
125 
126 
127 extern void GLAPIENTRY
128 _mesa_ClampColor(GLenum target, GLenum clamp);
129 
130 extern GLboolean
131 _mesa_get_clamp_fragment_color(const struct gl_context *ctx,
132                                const struct gl_framebuffer *drawFb);
133 
134 extern GLboolean
135 _mesa_get_clamp_vertex_color(const struct gl_context *ctx,
136                              const struct gl_framebuffer *drawFb);
137 
138 extern GLboolean
139 _mesa_get_clamp_read_color(const struct gl_context *ctx,
140                            const struct gl_framebuffer *readFb);
141 
142 extern void
143 _mesa_update_clamp_fragment_color(struct gl_context *ctx,
144                                   const struct gl_framebuffer *drawFb);
145 
146 extern void
147 _mesa_update_clamp_vertex_color(struct gl_context *ctx,
148                                 const struct gl_framebuffer *drawFb);
149 
150 extern mesa_format
151 _mesa_get_render_format(const struct gl_context *ctx, mesa_format format);
152 
153 extern void
154 _mesa_init_color( struct gl_context * ctx );
155 
156 
157 static inline enum gl_advanced_blend_mode
_mesa_get_advanced_blend_sh_constant(GLbitfield blend_enabled,enum gl_advanced_blend_mode mode)158 _mesa_get_advanced_blend_sh_constant(GLbitfield blend_enabled,
159                                      enum gl_advanced_blend_mode mode)
160 {
161    return blend_enabled ? mode : BLEND_NONE;
162 }
163 
164 static inline bool
_mesa_advanded_blend_sh_constant_changed(struct gl_context * ctx,GLbitfield new_blend_enabled,enum gl_advanced_blend_mode new_mode)165 _mesa_advanded_blend_sh_constant_changed(struct gl_context *ctx,
166                                          GLbitfield new_blend_enabled,
167                                          enum gl_advanced_blend_mode new_mode)
168 {
169    return _mesa_get_advanced_blend_sh_constant(new_blend_enabled, new_mode) !=
170           _mesa_get_advanced_blend_sh_constant(ctx->Color.BlendEnabled,
171                                                ctx->Color._AdvancedBlendMode);
172 }
173 
174 static inline void
_mesa_flush_vertices_for_blend_state(struct gl_context * ctx)175 _mesa_flush_vertices_for_blend_state(struct gl_context *ctx)
176 {
177    if (!ctx->DriverFlags.NewBlend) {
178       FLUSH_VERTICES(ctx, _NEW_COLOR);
179    } else {
180       FLUSH_VERTICES(ctx, 0);
181       ctx->NewDriverState |= ctx->DriverFlags.NewBlend;
182    }
183 }
184 
185 static inline void
_mesa_flush_vertices_for_blend_adv(struct gl_context * ctx,GLbitfield new_blend_enabled,enum gl_advanced_blend_mode new_mode)186 _mesa_flush_vertices_for_blend_adv(struct gl_context *ctx,
187                                    GLbitfield new_blend_enabled,
188                                    enum gl_advanced_blend_mode new_mode)
189 {
190    /* The advanced blend mode needs _NEW_COLOR to update the state constant. */
191    if (_mesa_has_KHR_blend_equation_advanced(ctx) &&
192        _mesa_advanded_blend_sh_constant_changed(ctx, new_blend_enabled,
193                                                 new_mode)) {
194       FLUSH_VERTICES(ctx, _NEW_COLOR);
195       ctx->NewDriverState |= ctx->DriverFlags.NewBlend;
196       return;
197    }
198    _mesa_flush_vertices_for_blend_state(ctx);
199 }
200 
201 static inline GLbitfield
_mesa_replicate_colormask(GLbitfield mask0,unsigned num_buffers)202 _mesa_replicate_colormask(GLbitfield mask0, unsigned num_buffers)
203 {
204    GLbitfield mask = mask0;
205 
206    for (unsigned i = 1; i < num_buffers; i++)
207       mask |= mask0 << (i * 4);
208    return mask;
209 }
210 
211 #endif
212