summaryrefslogtreecommitdiff
path: root/src/gallium/drivers/llvmpipe/lp_bld_blend_aos.c
blob: ced7b9c11d739e1821357c13d5778b823e0e760c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
/**************************************************************************
 *
 * Copyright 2009 VMware, Inc.
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sub license, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice (including the
 * next paragraph) shall be included in all copies or substantial portions
 * of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 **************************************************************************/


/**
 * @file
 * Blend LLVM IR generation -- AoS layout.
 *
 * AoS blending is in general much slower than SoA, but there are some cases
 * where it might be faster. In particular, if a pixel is rendered only once
 * then the overhead of tiling and untiling will dominate over the speedup that
 * SoA gives. So we might want to detect such cases and fallback to AoS in the
 * future, but for now this function is here for historical/benchmarking
 * purposes.
 *
 * Run lp_blend_test after any change to this file.
 *
 * @author Jose Fonseca <jfonseca@vmware.com>
 */


#include "pipe/p_state.h"

#include "lp_bld_type.h"
#include "lp_bld_const.h"
#include "lp_bld_arit.h"
#include "lp_bld_logic.h"
#include "lp_bld_swizzle.h"
#include "lp_bld_blend.h"
#include "lp_bld_debug.h"


/**
 * We may the same values several times, so we keep them here to avoid
 * recomputing them. Also reusing the values allows us to do simplifications
 * that LLVM optimization passes wouldn't normally be able to do.
 */
struct lp_build_blend_aos_context
{
   struct lp_build_context base;
   
   LLVMValueRef src;
   LLVMValueRef dst;
   LLVMValueRef const_;

   LLVMValueRef inv_src;
   LLVMValueRef inv_dst;
   LLVMValueRef inv_const;
   LLVMValueRef saturate;

   LLVMValueRef rgb_src_factor;
   LLVMValueRef alpha_src_factor;
   LLVMValueRef rgb_dst_factor;
   LLVMValueRef alpha_dst_factor;
};


static LLVMValueRef
lp_build_blend_factor_unswizzled(struct lp_build_blend_aos_context *bld,
                                 unsigned factor,
                                 boolean alpha)
{
   switch (factor) {
   case PIPE_BLENDFACTOR_ZERO:
      return bld->base.zero;
   case PIPE_BLENDFACTOR_ONE:
      return bld->base.one;
   case PIPE_BLENDFACTOR_SRC_COLOR:
   case PIPE_BLENDFACTOR_SRC_ALPHA:
      return bld->src;
   case PIPE_BLENDFACTOR_DST_COLOR:
   case PIPE_BLENDFACTOR_DST_ALPHA:
      return bld->dst;
   case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
      if(alpha)
         return bld->base.one;
      else {
         if(!bld->inv_dst)
            bld->inv_dst = lp_build_comp(&bld->base, bld->dst);
         if(!bld->saturate)
            bld->saturate = lp_build_min(&bld->base, bld->src, bld->inv_dst);
         return bld->saturate;
      }
   case PIPE_BLENDFACTOR_CONST_COLOR:
   case PIPE_BLENDFACTOR_CONST_ALPHA:
      return bld->const_;
   case PIPE_BLENDFACTOR_SRC1_COLOR:
   case PIPE_BLENDFACTOR_SRC1_ALPHA:
      /* TODO */
      assert(0);
      return bld->base.zero;
   case PIPE_BLENDFACTOR_INV_SRC_COLOR:
   case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
      if(!bld->inv_src)
         bld->inv_src = lp_build_comp(&bld->base, bld->src);
      return bld->inv_src;
   case PIPE_BLENDFACTOR_INV_DST_COLOR:
   case PIPE_BLENDFACTOR_INV_DST_ALPHA:
      if(!bld->inv_dst)
         bld->inv_dst = lp_build_comp(&bld->base, bld->dst);
      return bld->inv_dst;
   case PIPE_BLENDFACTOR_INV_CONST_COLOR:
   case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
      if(!bld->inv_const)
         bld->inv_const = lp_build_comp(&bld->base, bld->const_);
      return bld->inv_const;
   case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
   case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
      /* TODO */
      assert(0);
      return bld->base.zero;
   default:
      assert(0);
      return bld->base.zero;
   }
}


enum lp_build_blend_swizzle {
   LP_BUILD_BLEND_SWIZZLE_RGBA = 0,
   LP_BUILD_BLEND_SWIZZLE_AAAA = 1
};


/**
 * How should we shuffle the base factor.
 */
static enum lp_build_blend_swizzle
lp_build_blend_factor_swizzle(unsigned factor)
{
   switch (factor) {
   case PIPE_BLENDFACTOR_ONE:
   case PIPE_BLENDFACTOR_ZERO:
   case PIPE_BLENDFACTOR_SRC_COLOR:
   case PIPE_BLENDFACTOR_DST_COLOR:
   case PIPE_BLENDFACTOR_CONST_COLOR:
   case PIPE_BLENDFACTOR_SRC1_COLOR:
   case PIPE_BLENDFACTOR_INV_SRC_COLOR:
   case PIPE_BLENDFACTOR_INV_DST_COLOR:
   case PIPE_BLENDFACTOR_INV_CONST_COLOR:
   case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
      return LP_BUILD_BLEND_SWIZZLE_RGBA;
   case PIPE_BLENDFACTOR_SRC_ALPHA:
   case PIPE_BLENDFACTOR_DST_ALPHA:
   case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
   case PIPE_BLENDFACTOR_SRC1_ALPHA:
   case PIPE_BLENDFACTOR_CONST_ALPHA:
   case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
   case PIPE_BLENDFACTOR_INV_DST_ALPHA:
   case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
   case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
      return LP_BUILD_BLEND_SWIZZLE_AAAA;
   default:
      assert(0);
      return LP_BUILD_BLEND_SWIZZLE_RGBA;
   }
}


static LLVMValueRef
lp_build_blend_swizzle(struct lp_build_blend_aos_context *bld,
                       LLVMValueRef rgb, 
                       LLVMValueRef alpha, 
                       enum lp_build_blend_swizzle rgb_swizzle,
                       unsigned alpha_swizzle)
{
   if(rgb == alpha) {
      if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_RGBA)
         return rgb;
      if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_AAAA)
         return lp_build_broadcast_aos(&bld->base, rgb, alpha_swizzle);
   }
   else {
      if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_RGBA) {
         boolean cond[4] = {0, 0, 0, 0};
         cond[alpha_swizzle] = 1;
         return lp_build_select_aos(&bld->base, alpha, rgb, cond);
      }
      if(rgb_swizzle == LP_BUILD_BLEND_SWIZZLE_AAAA) {
         unsigned char swizzle[4];
         swizzle[0] = alpha_swizzle;
         swizzle[1] = alpha_swizzle;
         swizzle[2] = alpha_swizzle;
         swizzle[3] = alpha_swizzle;
         swizzle[alpha_swizzle] += 4;
         return lp_build_swizzle2_aos(&bld->base, rgb, alpha, swizzle);
      }
   }
   assert(0);
   return bld->base.undef;
}


/**
 * @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendFuncSeparate.xml
 */
static LLVMValueRef
lp_build_blend_factor(struct lp_build_blend_aos_context *bld,
                      LLVMValueRef factor1,
                      unsigned rgb_factor,
                      unsigned alpha_factor,
                      unsigned alpha_swizzle)
{
   LLVMValueRef rgb_factor_;
   LLVMValueRef alpha_factor_;
   LLVMValueRef factor2;
   enum lp_build_blend_swizzle rgb_swizzle;

   rgb_factor_   = lp_build_blend_factor_unswizzled(bld, rgb_factor,   FALSE);
   alpha_factor_ = lp_build_blend_factor_unswizzled(bld, alpha_factor, TRUE);

   rgb_swizzle = lp_build_blend_factor_swizzle(rgb_factor);

   factor2 = lp_build_blend_swizzle(bld, rgb_factor_, alpha_factor_, rgb_swizzle, alpha_swizzle);

   return lp_build_mul(&bld->base, factor1, factor2);
}


boolean
lp_build_blend_func_commutative(unsigned func)
{
   switch (func) {
   case PIPE_BLEND_ADD:
   case PIPE_BLEND_MIN:
   case PIPE_BLEND_MAX:
      return TRUE;
   case PIPE_BLEND_SUBTRACT:
   case PIPE_BLEND_REVERSE_SUBTRACT:
      return FALSE;
   default:
      assert(0);
      return TRUE;
   }
}


boolean
lp_build_blend_func_reverse(unsigned rgb_func, unsigned alpha_func)
{
   if(rgb_func == alpha_func)
      return FALSE;
   if(rgb_func == PIPE_BLEND_SUBTRACT && alpha_func == PIPE_BLEND_REVERSE_SUBTRACT)
      return TRUE;
   if(rgb_func == PIPE_BLEND_REVERSE_SUBTRACT && alpha_func == PIPE_BLEND_SUBTRACT)
      return TRUE;
   return FALSE;
}


/**
 * @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendEquationSeparate.xml
 */
LLVMValueRef
lp_build_blend_func(struct lp_build_context *bld,
                    unsigned func,
                    LLVMValueRef term1, 
                    LLVMValueRef term2)
{
   switch (func) {
   case PIPE_BLEND_ADD:
      return lp_build_add(bld, term1, term2);
      break;
   case PIPE_BLEND_SUBTRACT:
      return lp_build_sub(bld, term1, term2);
   case PIPE_BLEND_REVERSE_SUBTRACT:
      return lp_build_sub(bld, term2, term1);
   case PIPE_BLEND_MIN:
      return lp_build_min(bld, term1, term2);
   case PIPE_BLEND_MAX:
      return lp_build_max(bld, term1, term2);
   default:
      assert(0);
      return bld->zero;
   }
}


LLVMValueRef
lp_build_blend_aos(LLVMBuilderRef builder,
                   const struct pipe_blend_state *blend,
                   struct lp_type type,
                   LLVMValueRef src,
                   LLVMValueRef dst,
                   LLVMValueRef const_,
                   unsigned alpha_swizzle)
{
   struct lp_build_blend_aos_context bld;
   LLVMValueRef src_term;
   LLVMValueRef dst_term;

   /* FIXME */
   assert(blend->colormask == 0xf);

   if(!blend->blend_enable)
      return src;

   /* It makes no sense to blend unless values are normalized */
   assert(type.norm);

   /* Setup build context */
   memset(&bld, 0, sizeof bld);
   lp_build_context_init(&bld.base, builder, type);
   bld.src = src;
   bld.dst = dst;
   bld.const_ = const_;

   /* TODO: There are still a few optimization opportunities here. For certain
    * combinations it is possible to reorder the operations and therefore saving
    * some instructions. */

   src_term = lp_build_blend_factor(&bld, src, blend->rgb_src_factor, blend->alpha_src_factor, alpha_swizzle);
   dst_term = lp_build_blend_factor(&bld, dst, blend->rgb_dst_factor, blend->alpha_dst_factor, alpha_swizzle);

   lp_build_name(src_term, "src_term");
   lp_build_name(dst_term, "dst_term");

   if(blend->rgb_func == blend->alpha_func) {
      return lp_build_blend_func(&bld.base, blend->rgb_func, src_term, dst_term);
   }
   else {
      /* Seperate RGB / A functions */

      LLVMValueRef rgb;
      LLVMValueRef alpha;

      rgb   = lp_build_blend_func(&bld.base, blend->rgb_func,   src_term, dst_term);
      alpha = lp_build_blend_func(&bld.base, blend->alpha_func, src_term, dst_term);

      return lp_build_blend_swizzle(&bld, rgb, alpha, LP_BUILD_BLEND_SWIZZLE_RGBA, alpha_swizzle);
   }
}