1 /**************************************************************************
2 *
3 * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 /*
29 * Authors:
30 * Keith Whitwell <keith@tungstengraphics.com>
31 * Brian Paul
32 */
33
34
35 #include "st_context.h"
36 #include "st_atom.h"
37
38 #include "pipe/p_context.h"
39 #include "pipe/p_defines.h"
40 #include "cso_cache/cso_context.h"
41
42 #include "main/macros.h"
43
44 /**
45 * Convert GLenum blend tokens to pipe tokens.
46 * Both blend factors and blend funcs are accepted.
47 */
48 static GLuint
translate_blend(GLenum blend)49 translate_blend(GLenum blend)
50 {
51 switch (blend) {
52 /* blend functions */
53 case GL_FUNC_ADD:
54 return PIPE_BLEND_ADD;
55 case GL_FUNC_SUBTRACT:
56 return PIPE_BLEND_SUBTRACT;
57 case GL_FUNC_REVERSE_SUBTRACT:
58 return PIPE_BLEND_REVERSE_SUBTRACT;
59 case GL_MIN:
60 return PIPE_BLEND_MIN;
61 case GL_MAX:
62 return PIPE_BLEND_MAX;
63
64 /* blend factors */
65 case GL_ONE:
66 return PIPE_BLENDFACTOR_ONE;
67 case GL_SRC_COLOR:
68 return PIPE_BLENDFACTOR_SRC_COLOR;
69 case GL_SRC_ALPHA:
70 return PIPE_BLENDFACTOR_SRC_ALPHA;
71 case GL_DST_ALPHA:
72 return PIPE_BLENDFACTOR_DST_ALPHA;
73 case GL_DST_COLOR:
74 return PIPE_BLENDFACTOR_DST_COLOR;
75 case GL_SRC_ALPHA_SATURATE:
76 return PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE;
77 case GL_CONSTANT_COLOR:
78 return PIPE_BLENDFACTOR_CONST_COLOR;
79 case GL_CONSTANT_ALPHA:
80 return PIPE_BLENDFACTOR_CONST_ALPHA;
81 case GL_SRC1_COLOR:
82 return PIPE_BLENDFACTOR_SRC1_COLOR;
83 case GL_SRC1_ALPHA:
84 return PIPE_BLENDFACTOR_SRC1_ALPHA;
85 case GL_ZERO:
86 return PIPE_BLENDFACTOR_ZERO;
87 case GL_ONE_MINUS_SRC_COLOR:
88 return PIPE_BLENDFACTOR_INV_SRC_COLOR;
89 case GL_ONE_MINUS_SRC_ALPHA:
90 return PIPE_BLENDFACTOR_INV_SRC_ALPHA;
91 case GL_ONE_MINUS_DST_COLOR:
92 return PIPE_BLENDFACTOR_INV_DST_COLOR;
93 case GL_ONE_MINUS_DST_ALPHA:
94 return PIPE_BLENDFACTOR_INV_DST_ALPHA;
95 case GL_ONE_MINUS_CONSTANT_COLOR:
96 return PIPE_BLENDFACTOR_INV_CONST_COLOR;
97 case GL_ONE_MINUS_CONSTANT_ALPHA:
98 return PIPE_BLENDFACTOR_INV_CONST_ALPHA;
99 case GL_ONE_MINUS_SRC1_COLOR:
100 return PIPE_BLENDFACTOR_INV_SRC1_COLOR;
101 case GL_ONE_MINUS_SRC1_ALPHA:
102 return PIPE_BLENDFACTOR_INV_SRC1_ALPHA;
103 default:
104 assert("invalid GL token in translate_blend()" == NULL);
105 return 0;
106 }
107 }
108
109
110 /**
111 * Convert GLenum logicop tokens to pipe tokens.
112 */
113 static GLuint
translate_logicop(GLenum logicop)114 translate_logicop(GLenum logicop)
115 {
116 switch (logicop) {
117 case GL_CLEAR:
118 return PIPE_LOGICOP_CLEAR;
119 case GL_NOR:
120 return PIPE_LOGICOP_NOR;
121 case GL_AND_INVERTED:
122 return PIPE_LOGICOP_AND_INVERTED;
123 case GL_COPY_INVERTED:
124 return PIPE_LOGICOP_COPY_INVERTED;
125 case GL_AND_REVERSE:
126 return PIPE_LOGICOP_AND_REVERSE;
127 case GL_INVERT:
128 return PIPE_LOGICOP_INVERT;
129 case GL_XOR:
130 return PIPE_LOGICOP_XOR;
131 case GL_NAND:
132 return PIPE_LOGICOP_NAND;
133 case GL_AND:
134 return PIPE_LOGICOP_AND;
135 case GL_EQUIV:
136 return PIPE_LOGICOP_EQUIV;
137 case GL_NOOP:
138 return PIPE_LOGICOP_NOOP;
139 case GL_OR_INVERTED:
140 return PIPE_LOGICOP_OR_INVERTED;
141 case GL_COPY:
142 return PIPE_LOGICOP_COPY;
143 case GL_OR_REVERSE:
144 return PIPE_LOGICOP_OR_REVERSE;
145 case GL_OR:
146 return PIPE_LOGICOP_OR;
147 case GL_SET:
148 return PIPE_LOGICOP_SET;
149 default:
150 assert("invalid GL token in translate_logicop()" == NULL);
151 return 0;
152 }
153 }
154
155 /**
156 * Figure out if colormasks are different per rt.
157 */
158 static GLboolean
colormask_per_rt(const struct gl_context * ctx)159 colormask_per_rt(const struct gl_context *ctx)
160 {
161 /* a bit suboptimal have to compare lots of values */
162 unsigned i;
163 for (i = 1; i < ctx->Const.MaxDrawBuffers; i++) {
164 if (memcmp(ctx->Color.ColorMask[0], ctx->Color.ColorMask[i], 4)) {
165 return GL_TRUE;
166 }
167 }
168 return GL_FALSE;
169 }
170
171 /**
172 * Figure out if blend enables/state are different per rt.
173 */
174 static GLboolean
blend_per_rt(const struct gl_context * ctx)175 blend_per_rt(const struct gl_context *ctx)
176 {
177 if (ctx->Color.BlendEnabled &&
178 (ctx->Color.BlendEnabled != ((1 << ctx->Const.MaxDrawBuffers) - 1))) {
179 /* This can only happen if GL_EXT_draw_buffers2 is enabled */
180 return GL_TRUE;
181 }
182 if (ctx->Color._BlendFuncPerBuffer || ctx->Color._BlendEquationPerBuffer) {
183 /* this can only happen if GL_ARB_draw_buffers_blend is enabled */
184 return GL_TRUE;
185 }
186 return GL_FALSE;
187 }
188
189 static void
update_blend(struct st_context * st)190 update_blend( struct st_context *st )
191 {
192 struct pipe_blend_state *blend = &st->state.blend;
193 const struct gl_context *ctx = st->ctx;
194 unsigned num_state = 1;
195 unsigned i, j;
196
197 memset(blend, 0, sizeof(*blend));
198
199 if (blend_per_rt(ctx) || colormask_per_rt(ctx)) {
200 num_state = ctx->Const.MaxDrawBuffers;
201 blend->independent_blend_enable = 1;
202 }
203 if (ctx->Color.ColorLogicOpEnabled) {
204 /* logicop enabled */
205 blend->logicop_enable = 1;
206 blend->logicop_func = translate_logicop(ctx->Color.LogicOp);
207 }
208 else if (ctx->Color.BlendEnabled) {
209 /* blending enabled */
210 for (i = 0, j = 0; i < num_state; i++) {
211
212 blend->rt[i].blend_enable = (ctx->Color.BlendEnabled >> i) & 0x1;
213
214 if (ctx->Extensions.ARB_draw_buffers_blend)
215 j = i;
216
217 blend->rt[i].rgb_func =
218 translate_blend(ctx->Color.Blend[j].EquationRGB);
219
220 if (ctx->Color.Blend[i].EquationRGB == GL_MIN ||
221 ctx->Color.Blend[i].EquationRGB == GL_MAX) {
222 /* Min/max are special */
223 blend->rt[i].rgb_src_factor = PIPE_BLENDFACTOR_ONE;
224 blend->rt[i].rgb_dst_factor = PIPE_BLENDFACTOR_ONE;
225 }
226 else {
227 blend->rt[i].rgb_src_factor =
228 translate_blend(ctx->Color.Blend[j].SrcRGB);
229 blend->rt[i].rgb_dst_factor =
230 translate_blend(ctx->Color.Blend[j].DstRGB);
231 }
232
233 blend->rt[i].alpha_func =
234 translate_blend(ctx->Color.Blend[j].EquationA);
235
236 if (ctx->Color.Blend[i].EquationA == GL_MIN ||
237 ctx->Color.Blend[i].EquationA == GL_MAX) {
238 /* Min/max are special */
239 blend->rt[i].alpha_src_factor = PIPE_BLENDFACTOR_ONE;
240 blend->rt[i].alpha_dst_factor = PIPE_BLENDFACTOR_ONE;
241 }
242 else {
243 blend->rt[i].alpha_src_factor =
244 translate_blend(ctx->Color.Blend[j].SrcA);
245 blend->rt[i].alpha_dst_factor =
246 translate_blend(ctx->Color.Blend[j].DstA);
247 }
248 }
249 }
250 else {
251 /* no blending / logicop */
252 }
253
254 /* Colormask - maybe reverse these bits? */
255 for (i = 0; i < num_state; i++) {
256 if (ctx->Color.ColorMask[i][0])
257 blend->rt[i].colormask |= PIPE_MASK_R;
258 if (ctx->Color.ColorMask[i][1])
259 blend->rt[i].colormask |= PIPE_MASK_G;
260 if (ctx->Color.ColorMask[i][2])
261 blend->rt[i].colormask |= PIPE_MASK_B;
262 if (ctx->Color.ColorMask[i][3])
263 blend->rt[i].colormask |= PIPE_MASK_A;
264 }
265
266 if (ctx->Color.DitherFlag)
267 blend->dither = 1;
268
269 if (ctx->Multisample.Enabled) {
270 /* unlike in gallium/d3d10 these operations are only performed
271 if msaa is enabled */
272 if (ctx->Multisample.SampleAlphaToCoverage)
273 blend->alpha_to_coverage = 1;
274 if (ctx->Multisample.SampleAlphaToOne)
275 blend->alpha_to_one = 1;
276 }
277
278 cso_set_blend(st->cso_context, blend);
279
280 {
281 struct pipe_blend_color bc;
282 COPY_4FV(bc.color, ctx->Color.BlendColorUnclamped);
283 cso_set_blend_color(st->cso_context, &bc);
284 }
285 }
286
287
288 const struct st_tracked_state st_update_blend = {
289 "st_update_blend", /* name */
290 { /* dirty */
291 (_NEW_COLOR | _NEW_MULTISAMPLE), /* XXX _NEW_BLEND someday? */ /* mesa */
292 0, /* st */
293 },
294 update_blend, /* update */
295 };
296