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/**************************************************************************
*
* 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 -- SoA.
*
* @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_blend.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_soa_context
{
struct lp_build_context base;
LLVMValueRef src[4];
LLVMValueRef dst[4];
LLVMValueRef con[4];
LLVMValueRef inv_src[4];
LLVMValueRef inv_dst[4];
LLVMValueRef inv_con[4];
LLVMValueRef src_alpha_saturate;
/**
* We store all factors in a table in order to eliminate redundant
* multiplications later.
*/
LLVMValueRef factor[2][2][4];
/**
* Table with all terms.
*/
LLVMValueRef term[2][4];
};
static LLVMValueRef
lp_build_blend_soa_factor(struct lp_build_blend_soa_context *bld,
unsigned factor, unsigned i)
{
/*
* Compute src/first term RGB
*/
switch (factor) {
case PIPE_BLENDFACTOR_ONE:
return bld->base.one;
case PIPE_BLENDFACTOR_SRC_COLOR:
return bld->src[i];
case PIPE_BLENDFACTOR_SRC_ALPHA:
return bld->src[3];
case PIPE_BLENDFACTOR_DST_COLOR:
return bld->dst[i];
case PIPE_BLENDFACTOR_DST_ALPHA:
return bld->dst[3];
case PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE:
if(i == 3)
return bld->base.one;
else {
if(!bld->inv_dst[3])
bld->inv_dst[3] = lp_build_comp(&bld->base, bld->dst[3]);
if(!bld->src_alpha_saturate)
bld->src_alpha_saturate = lp_build_min(&bld->base, bld->src[3], bld->inv_dst[3]);
return bld->src_alpha_saturate;
}
case PIPE_BLENDFACTOR_CONST_COLOR:
return bld->con[i];
case PIPE_BLENDFACTOR_CONST_ALPHA:
return bld->con[3];
case PIPE_BLENDFACTOR_SRC1_COLOR:
/* TODO */
assert(0);
return bld->base.zero;
case PIPE_BLENDFACTOR_SRC1_ALPHA:
/* TODO */
assert(0);
return bld->base.zero;
case PIPE_BLENDFACTOR_ZERO:
return bld->base.zero;
case PIPE_BLENDFACTOR_INV_SRC_COLOR:
if(!bld->inv_src[i])
bld->inv_src[i] = lp_build_comp(&bld->base, bld->src[i]);
return bld->inv_src[i];
case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
if(!bld->inv_src[3])
bld->inv_src[3] = lp_build_comp(&bld->base, bld->src[3]);
return bld->inv_src[3];
case PIPE_BLENDFACTOR_INV_DST_COLOR:
if(!bld->inv_dst[i])
bld->inv_dst[i] = lp_build_comp(&bld->base, bld->dst[i]);
return bld->inv_dst[i];
case PIPE_BLENDFACTOR_INV_DST_ALPHA:
if(!bld->inv_dst[3])
bld->inv_dst[3] = lp_build_comp(&bld->base, bld->dst[3]);
return bld->inv_dst[3];
case PIPE_BLENDFACTOR_INV_CONST_COLOR:
if(!bld->inv_con[i])
bld->inv_con[i] = lp_build_comp(&bld->base, bld->con[i]);
return bld->inv_con[i];
case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
if(!bld->inv_con[3])
bld->inv_con[3] = lp_build_comp(&bld->base, bld->con[3]);
return bld->inv_con[3];
case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
/* TODO */
assert(0);
return bld->base.zero;
case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
/* TODO */
assert(0);
return bld->base.zero;
default:
assert(0);
return bld->base.zero;
}
}
void
lp_build_blend_soa(LLVMBuilderRef builder,
const struct pipe_blend_state *blend,
union lp_type type,
LLVMValueRef src[4],
LLVMValueRef dst[4],
LLVMValueRef con[4],
LLVMValueRef res[4])
{
struct lp_build_blend_soa_context bld;
unsigned i, j, k;
/* Setup build context */
memset(&bld, 0, sizeof bld);
lp_build_context_init(&bld.base, builder, type);
for (i = 0; i < 4; ++i) {
bld.src[i] = src[i];
bld.dst[i] = dst[i];
bld.con[i] = con[i];
}
for (i = 0; i < 4; ++i) {
if (blend->colormask & (1 << i)) {
if (blend->blend_enable) {
unsigned src_factor = i < 3 ? blend->rgb_src_factor : blend->alpha_src_factor;
unsigned dst_factor = i < 3 ? blend->rgb_dst_factor : blend->alpha_dst_factor;
unsigned func = i < 3 ? blend->rgb_func : blend->alpha_func;
boolean func_commutative = lp_build_blend_func_commutative(func);
/* It makes no sense to blend unless values are normalized */
assert(type.norm);
/*
* Compute src/dst factors.
*/
bld.factor[0][0][i] = src[i];
bld.factor[0][1][i] = lp_build_blend_soa_factor(&bld, src_factor, i);
bld.factor[1][0][i] = dst[i];
bld.factor[1][1][i] = lp_build_blend_soa_factor(&bld, dst_factor, i);
/*
* Compute src/dst terms
*/
for(k = 0; k < 2; ++k) {
/* See if this multiplication has been previously computed */
for(j = 0; j < i; ++j) {
if((bld.factor[k][0][j] == bld.factor[k][0][i] &&
bld.factor[k][1][j] == bld.factor[k][1][i]) ||
(bld.factor[k][0][j] == bld.factor[k][1][i] &&
bld.factor[k][1][j] == bld.factor[k][0][i]))
break;
}
if(j < i)
bld.term[k][i] = bld.term[k][j];
else
bld.term[k][i] = lp_build_mul(&bld.base, bld.factor[k][0][i], bld.factor[k][1][i]);
}
/*
* Combine terms
*/
/* See if this function has been previously applied */
for(j = 0; j < i; ++j) {
unsigned prev_func = j < 3 ? blend->rgb_func : blend->alpha_func;
unsigned func_reverse = lp_build_blend_func_reverse(func, prev_func);
if((!func_reverse &&
bld.term[0][j] == bld.term[0][i] &&
bld.term[1][j] == bld.term[1][i]) ||
((func_commutative || func_reverse) &&
bld.term[0][j] == bld.term[1][i] &&
bld.term[1][j] == bld.term[0][i]))
break;
}
if(j < i)
res[i] = res[j];
else
res[i] = lp_build_blend_func(&bld.base, func, bld.term[0][i], bld.term[1][i]);
}
else {
res[i] = src[i];
}
}
else {
res[i] = dst[i];
}
}
}
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