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