1 /**************************************************************************
3 * Copyright 2009 VMware, Inc.
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:
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
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 VMWARE 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.
26 **************************************************************************/
31 * Blend LLVM IR generation -- AoS layout.
33 * AoS blending is in general much slower than SoA, but there are some cases
34 * where it might be faster. In particular, if a pixel is rendered only once
35 * then the overhead of tiling and untiling will dominate over the speedup that
36 * SoA gives. So we might want to detect such cases and fallback to AoS in the
37 * future, but for now this function is here for historical/benchmarking
40 * Run lp_blend_test after any change to this file.
42 * @author Jose Fonseca <jfonseca@vmware.com>
46 #include "pipe/p_state.h"
47 #include "util/u_debug.h"
48 #include "util/u_format.h"
50 #include "gallivm/lp_bld_type.h"
51 #include "gallivm/lp_bld_const.h"
52 #include "gallivm/lp_bld_arit.h"
53 #include "gallivm/lp_bld_logic.h"
54 #include "gallivm/lp_bld_swizzle.h"
55 #include "gallivm/lp_bld_bitarit.h"
56 #include "gallivm/lp_bld_debug.h"
58 #include "lp_bld_blend.h"
62 * We may the same values several times, so we keep them here to avoid
63 * recomputing them. Also reusing the values allows us to do simplifications
64 * that LLVM optimization passes wouldn't normally be able to do.
66 struct lp_build_blend_aos_context
68 struct lp_build_context base
;
71 LLVMValueRef src_alpha
;
73 LLVMValueRef src1_alpha
;
76 LLVMValueRef const_alpha
;
77 boolean has_dst_alpha
;
80 LLVMValueRef inv_src_alpha
;
82 LLVMValueRef inv_const
;
83 LLVMValueRef inv_const_alpha
;
84 LLVMValueRef saturate
;
86 LLVMValueRef rgb_src_factor
;
87 LLVMValueRef alpha_src_factor
;
88 LLVMValueRef rgb_dst_factor
;
89 LLVMValueRef alpha_dst_factor
;
94 lp_build_blend_factor_unswizzled(struct lp_build_blend_aos_context
*bld
,
98 LLVMValueRef src_alpha
= bld
->src_alpha
? bld
->src_alpha
: bld
->src
;
99 LLVMValueRef src1_alpha
= bld
->src1_alpha
? bld
->src1_alpha
: bld
->src1
;
100 LLVMValueRef const_alpha
= bld
->const_alpha
? bld
->const_alpha
: bld
->const_
;
103 case PIPE_BLENDFACTOR_ZERO
:
104 return bld
->base
.zero
;
105 case PIPE_BLENDFACTOR_ONE
:
106 return bld
->base
.one
;
107 case PIPE_BLENDFACTOR_SRC_COLOR
:
109 case PIPE_BLENDFACTOR_SRC_ALPHA
:
111 case PIPE_BLENDFACTOR_DST_COLOR
:
112 case PIPE_BLENDFACTOR_DST_ALPHA
:
114 case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE
:
116 return bld
->base
.one
;
119 * If there's no dst alpha the complement is zero but for unclamped
120 * float inputs min can be non-zero (negative).
122 if (!bld
->has_dst_alpha
) {
124 bld
->saturate
= lp_build_min(&bld
->base
, src_alpha
, bld
->base
.zero
);
128 bld
->inv_dst
= lp_build_comp(&bld
->base
, bld
->dst
);
130 bld
->saturate
= lp_build_min(&bld
->base
, src_alpha
, bld
->inv_dst
);
132 return bld
->saturate
;
134 case PIPE_BLENDFACTOR_CONST_COLOR
:
136 case PIPE_BLENDFACTOR_CONST_ALPHA
:
138 case PIPE_BLENDFACTOR_SRC1_COLOR
:
140 case PIPE_BLENDFACTOR_SRC1_ALPHA
:
142 case PIPE_BLENDFACTOR_INV_SRC_COLOR
:
144 bld
->inv_src
= lp_build_comp(&bld
->base
, bld
->src
);
146 case PIPE_BLENDFACTOR_INV_SRC_ALPHA
:
147 if(!bld
->inv_src_alpha
)
148 bld
->inv_src_alpha
= lp_build_comp(&bld
->base
, src_alpha
);
149 return bld
->inv_src_alpha
;
150 case PIPE_BLENDFACTOR_INV_DST_COLOR
:
151 case PIPE_BLENDFACTOR_INV_DST_ALPHA
:
153 bld
->inv_dst
= lp_build_comp(&bld
->base
, bld
->dst
);
155 case PIPE_BLENDFACTOR_INV_CONST_COLOR
:
157 bld
->inv_const
= lp_build_comp(&bld
->base
, bld
->const_
);
158 return bld
->inv_const
;
159 case PIPE_BLENDFACTOR_INV_CONST_ALPHA
:
160 if(!bld
->inv_const_alpha
)
161 bld
->inv_const_alpha
= lp_build_comp(&bld
->base
, const_alpha
);
162 return bld
->inv_const_alpha
;
163 case PIPE_BLENDFACTOR_INV_SRC1_COLOR
:
164 return lp_build_comp(&bld
->base
, bld
->src1
);
165 case PIPE_BLENDFACTOR_INV_SRC1_ALPHA
:
166 return lp_build_comp(&bld
->base
, src1_alpha
);
169 return bld
->base
.zero
;
174 enum lp_build_blend_swizzle
{
175 LP_BUILD_BLEND_SWIZZLE_RGBA
= 0,
176 LP_BUILD_BLEND_SWIZZLE_AAAA
= 1
181 * How should we shuffle the base factor.
183 static enum lp_build_blend_swizzle
184 lp_build_blend_factor_swizzle(unsigned factor
)
187 case PIPE_BLENDFACTOR_ONE
:
188 case PIPE_BLENDFACTOR_ZERO
:
189 case PIPE_BLENDFACTOR_SRC_COLOR
:
190 case PIPE_BLENDFACTOR_DST_COLOR
:
191 case PIPE_BLENDFACTOR_CONST_COLOR
:
192 case PIPE_BLENDFACTOR_SRC1_COLOR
:
193 case PIPE_BLENDFACTOR_INV_SRC_COLOR
:
194 case PIPE_BLENDFACTOR_INV_DST_COLOR
:
195 case PIPE_BLENDFACTOR_INV_CONST_COLOR
:
196 case PIPE_BLENDFACTOR_INV_SRC1_COLOR
:
197 return LP_BUILD_BLEND_SWIZZLE_RGBA
;
198 case PIPE_BLENDFACTOR_SRC_ALPHA
:
199 case PIPE_BLENDFACTOR_DST_ALPHA
:
200 case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE
:
201 case PIPE_BLENDFACTOR_SRC1_ALPHA
:
202 case PIPE_BLENDFACTOR_CONST_ALPHA
:
203 case PIPE_BLENDFACTOR_INV_SRC_ALPHA
:
204 case PIPE_BLENDFACTOR_INV_DST_ALPHA
:
205 case PIPE_BLENDFACTOR_INV_CONST_ALPHA
:
206 case PIPE_BLENDFACTOR_INV_SRC1_ALPHA
:
207 return LP_BUILD_BLEND_SWIZZLE_AAAA
;
210 return LP_BUILD_BLEND_SWIZZLE_RGBA
;
216 lp_build_blend_swizzle(struct lp_build_blend_aos_context
*bld
,
219 enum lp_build_blend_swizzle rgb_swizzle
,
220 unsigned alpha_swizzle
,
221 unsigned num_channels
)
223 LLVMValueRef swizzled_rgb
;
225 switch (rgb_swizzle
) {
226 case LP_BUILD_BLEND_SWIZZLE_RGBA
:
229 case LP_BUILD_BLEND_SWIZZLE_AAAA
:
230 swizzled_rgb
= lp_build_swizzle_scalar_aos(&bld
->base
, rgb
, alpha_swizzle
, num_channels
);
234 swizzled_rgb
= bld
->base
.undef
;
238 swizzled_rgb
= lp_build_select_aos(&bld
->base
, 1 << alpha_swizzle
,
247 * @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendFuncSeparate.xml
250 lp_build_blend_factor(struct lp_build_blend_aos_context
*bld
,
252 unsigned alpha_factor
,
253 unsigned alpha_swizzle
,
254 unsigned num_channels
)
256 LLVMValueRef rgb_factor_
, alpha_factor_
;
257 enum lp_build_blend_swizzle rgb_swizzle
;
259 if (alpha_swizzle
== PIPE_SWIZZLE_X
&& num_channels
== 1) {
260 return lp_build_blend_factor_unswizzled(bld
, alpha_factor
, TRUE
);
263 rgb_factor_
= lp_build_blend_factor_unswizzled(bld
, rgb_factor
, FALSE
);
265 if (alpha_swizzle
!= PIPE_SWIZZLE_NONE
) {
266 rgb_swizzle
= lp_build_blend_factor_swizzle(rgb_factor
);
267 alpha_factor_
= lp_build_blend_factor_unswizzled(bld
, alpha_factor
, TRUE
);
268 return lp_build_blend_swizzle(bld
, rgb_factor_
, alpha_factor_
, rgb_swizzle
,
269 alpha_swizzle
, num_channels
);
277 * Performs blending of src and dst pixels
279 * @param blend the blend state of the shader variant
280 * @param cbuf_format format of the colour buffer
281 * @param type data type of the pixel vector
282 * @param rt render target index
283 * @param src blend src
284 * @param src_alpha blend src alpha (if not included in src)
285 * @param src1 second blend src (for dual source blend)
286 * @param src1_alpha second blend src alpha (if not included in src1)
287 * @param dst blend dst
288 * @param mask optional mask to apply to the blending result
289 * @param const_ const blend color
290 * @param const_alpha const blend color alpha (if not included in const_)
291 * @param swizzle swizzle values for RGBA
293 * @return the result of blending src and dst
296 lp_build_blend_aos(struct gallivm_state
*gallivm
,
297 const struct pipe_blend_state
*blend
,
298 enum pipe_format cbuf_format
,
302 LLVMValueRef src_alpha
,
304 LLVMValueRef src1_alpha
,
308 LLVMValueRef const_alpha
,
309 const unsigned char swizzle
[4],
312 const struct pipe_rt_blend_state
* state
= &blend
->rt
[rt
];
313 const struct util_format_description
* desc
;
314 struct lp_build_blend_aos_context bld
;
315 LLVMValueRef src_factor
, dst_factor
;
317 unsigned alpha_swizzle
= PIPE_SWIZZLE_NONE
;
320 desc
= util_format_description(cbuf_format
);
322 /* Setup build context */
323 memset(&bld
, 0, sizeof bld
);
324 lp_build_context_init(&bld
.base
, gallivm
, type
);
329 bld
.src_alpha
= src_alpha
;
330 bld
.src1_alpha
= src1_alpha
;
331 bld
.const_alpha
= const_alpha
;
332 bld
.has_dst_alpha
= FALSE
;
334 /* Find the alpha channel if not provided seperately */
336 for (i
= 0; i
< 4; ++i
) {
337 if (swizzle
[i
] == 3) {
342 * Note that we may get src_alpha included from source (and 4 channels)
343 * even if the destination doesn't have an alpha channel (for rgbx
344 * formats). Generally this shouldn't make much of a difference (we're
345 * relying on blend factors being sanitized already if there's no
348 bld
.has_dst_alpha
= desc
->swizzle
[3] <= PIPE_SWIZZLE_W
;
351 if (blend
->logicop_enable
) {
353 result
= lp_build_logicop(gallivm
->builder
, blend
->logicop_func
, src
, dst
);
358 } else if (!state
->blend_enable
) {
361 boolean rgb_alpha_same
= (state
->rgb_src_factor
== state
->rgb_dst_factor
&&
362 state
->alpha_src_factor
== state
->alpha_dst_factor
) ||
365 src_factor
= lp_build_blend_factor(&bld
, state
->rgb_src_factor
,
366 state
->alpha_src_factor
,
370 dst_factor
= lp_build_blend_factor(&bld
, state
->rgb_dst_factor
,
371 state
->alpha_dst_factor
,
375 result
= lp_build_blend(&bld
.base
,
377 state
->rgb_src_factor
,
378 state
->rgb_dst_factor
,
386 if(state
->rgb_func
!= state
->alpha_func
&& nr_channels
> 1 &&
387 alpha_swizzle
!= PIPE_SWIZZLE_NONE
) {
390 alpha
= lp_build_blend(&bld
.base
,
392 state
->alpha_src_factor
,
393 state
->alpha_dst_factor
,
401 result
= lp_build_blend_swizzle(&bld
,
404 LP_BUILD_BLEND_SWIZZLE_RGBA
,
410 /* Check if color mask is necessary */
411 if (!util_format_colormask_full(desc
, state
->colormask
)) {
412 LLVMValueRef color_mask
;
414 color_mask
= lp_build_const_mask_aos_swizzled(gallivm
, bld
.base
.type
,
415 state
->colormask
, nr_channels
, swizzle
);
416 lp_build_name(color_mask
, "color_mask");
418 /* Combine with input mask if necessary */
420 /* We can be blending floating values but masks are always integer... */
421 unsigned floating
= bld
.base
.type
.floating
;
422 bld
.base
.type
.floating
= 0;
424 mask
= lp_build_and(&bld
.base
, color_mask
, mask
);
426 bld
.base
.type
.floating
= floating
;
432 /* Apply mask, if one exists */
434 result
= lp_build_select(&bld
.base
, mask
, result
, dst
);