/**
* Performs blending of src and dst pixels
*
* @param blend the blend state of the shader variant
* @param cbuf_format format of the colour buffer
* @param type data type of the pixel vector
* @param rt render target index
* @param src blend src
* @param src_alpha blend src alpha (if not included in src)
* @param src1 second blend src (for dual source blend)
* @param src1_alpha second blend src alpha (if not included in src1)
* @param dst blend dst
* @param mask optional mask to apply to the blending result
* @param const_ const blend color
* @param const_alpha const blend color alpha (if not included in const_)
* @param swizzle swizzle values for RGBA
*
* @return the result of blending src and dst
*/
LLVMValueRef
lp_build_blend_aos(struct gallivm_state *gallivm,
const struct pipe_blend_state *blend,
enum pipe_format cbuf_format,
struct lp_type type,
unsigned rt,
LLVMValueRef src,
LLVMValueRef src_alpha,
LLVMValueRef src1,
LLVMValueRef src1_alpha,
LLVMValueRef dst,
LLVMValueRef mask,
LLVMValueRef const_,
LLVMValueRef const_alpha,
const unsigned char swizzle[4],
int nr_channels)
{
const struct pipe_rt_blend_state * state = &blend->rt[rt];
const struct util_format_description * desc;
struct lp_build_blend_aos_context bld;
LLVMValueRef src_factor, dst_factor;
LLVMValueRef result;
unsigned alpha_swizzle = UTIL_FORMAT_SWIZZLE_NONE;
unsigned i;
desc = util_format_description(cbuf_format);
/* Setup build context */
memset(&bld, 0, sizeof bld);
lp_build_context_init(&bld.base, gallivm, type);
bld.src = src;
bld.src1 = src1;
bld.dst = dst;
bld.const_ = const_;
bld.src_alpha = src_alpha;
bld.src1_alpha = src1_alpha;
bld.const_alpha = const_alpha;
/* Find the alpha channel if not provided seperately */
if (!src_alpha) {
for (i = 0; i < 4; ++i) {
if (swizzle[i] == 3) {
alpha_swizzle = i;
}
}
}
if (blend->logicop_enable) {
if(!type.floating) {
result = lp_build_logicop(gallivm->builder, blend->logicop_func, src, dst);
}
else {
result = src;
}
} else if (!state->blend_enable) {
result = src;
} else {
boolean rgb_alpha_same = (state->rgb_src_factor == state->rgb_dst_factor && state->alpha_src_factor == state->alpha_dst_factor) || nr_channels == 1;
src_factor = lp_build_blend_factor(&bld, state->rgb_src_factor,
state->alpha_src_factor,
alpha_swizzle,
nr_channels);
dst_factor = lp_build_blend_factor(&bld, state->rgb_dst_factor,
state->alpha_dst_factor,
alpha_swizzle,
nr_channels);
result = lp_build_blend(&bld.base,
state->rgb_func,
state->rgb_src_factor,
state->rgb_dst_factor,
src,
dst,
src_factor,
dst_factor,
rgb_alpha_same,
false);
if(state->rgb_func != state->alpha_func && nr_channels > 1 && alpha_swizzle != UTIL_FORMAT_SWIZZLE_NONE) {
LLVMValueRef alpha;
alpha = lp_build_blend(&bld.base,
state->alpha_func,
state->alpha_src_factor,
state->alpha_dst_factor,
src,
dst,
src_factor,
dst_factor,
rgb_alpha_same,
false);
result = lp_build_blend_swizzle(&bld,
result,
alpha,
LP_BUILD_BLEND_SWIZZLE_RGBA,
alpha_swizzle,
nr_channels);
}
}
/* Check if color mask is necessary */
if (!util_format_colormask_full(desc, state->colormask)) {
LLVMValueRef color_mask;
color_mask = lp_build_const_mask_aos_swizzled(gallivm, bld.base.type, state->colormask, nr_channels, swizzle);
lp_build_name(color_mask, "color_mask");
/* Combine with input mask if necessary */
if (mask) {
/* We can be blending floating values but masks are always integer... */
unsigned floating = bld.base.type.floating;
bld.base.type.floating = 0;
mask = lp_build_and(&bld.base, color_mask, mask);
bld.base.type.floating = floating;
} else {
mask = color_mask;
}
}
/* Apply mask, if one exists */
if (mask) {
result = lp_build_select(&bld.base, mask, result, dst);
}
return result;
}
/**
* Generate blend code in SOA mode.
* \param src src/fragment color
* \param dst dst/framebuffer color
* \param con constant blend color
* \param res the result/output
*/
void
lp_build_blend_soa(LLVMBuilderRef builder,
const struct pipe_blend_state *blend,
struct 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->logicop_enable) {
if(!type.floating) {
res[i] = lp_build_logicop(builder, blend->logicop_func, src[i], dst[i]);
}
else
res[i] = dst[i];
}
else 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];
}
}
}
/**
* Generate blend code in SOA mode.
* \param rt render target index (to index the blend / colormask state)
* \param src src/fragment color
* \param dst dst/framebuffer color
* \param con constant blend color
* \param res the result/output
*/
void
lp_build_blend_soa(struct gallivm_state *gallivm,
const struct pipe_blend_state *blend,
struct lp_type type,
unsigned rt,
LLVMValueRef src[4],
LLVMValueRef dst[4],
LLVMValueRef con[4],
LLVMValueRef res[4])
{
LLVMBuilderRef builder = gallivm->builder;
struct lp_build_blend_soa_context bld;
unsigned i, j, k;
assert(rt < PIPE_MAX_COLOR_BUFS);
/* Setup build context */
memset(&bld, 0, sizeof bld);
lp_build_context_init(&bld.base, gallivm, 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) {
/* only compute blending for the color channels enabled for writing */
if (blend->rt[rt].colormask & (1 << i)) {
if (blend->logicop_enable) {
if(!type.floating) {
res[i] = lp_build_logicop(builder, blend->logicop_func, src[i], dst[i]);
}
else
res[i] = dst[i];
}
else if (blend->rt[rt].blend_enable) {
unsigned src_factor = i < 3 ? blend->rt[rt].rgb_src_factor : blend->rt[rt].alpha_src_factor;
unsigned dst_factor = i < 3 ? blend->rt[rt].rgb_dst_factor : blend->rt[rt].alpha_dst_factor;
unsigned func = i < 3 ? blend->rt[rt].rgb_func : blend->rt[rt].alpha_func;
boolean func_commutative = lp_build_blend_func_commutative(func);
/*
* 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);
/*
* Check if lp_build_blend can perform any optimisations
*/
res[i] = lp_build_blend(&bld.base,
func,
src_factor,
dst_factor,
bld.factor[0][0][i],
bld.factor[1][0][i],
bld.factor[0][1][i],
bld.factor[1][1][i],
true,
true);
if (res[i]) {
continue;
}
/*
* 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][j])
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]);
if (src_factor == PIPE_BLENDFACTOR_ZERO &&
(dst_factor == PIPE_BLENDFACTOR_DST_ALPHA ||
dst_factor == PIPE_BLENDFACTOR_INV_DST_ALPHA)) {
/* XXX special case these combos to work around an apparent
* bug in LLVM.
* This hack disables the check for multiplication by zero
* in lp_bld_mul(). When we optimize away the
* multiplication, something goes wrong during code
* generation and we segfault at runtime.
*/
LLVMValueRef zeroSave = bld.base.zero;
bld.base.zero = NULL;
bld.term[k][i] = lp_build_mul(&bld.base, bld.factor[k][0][i],
bld.factor[k][1][i]);
bld.base.zero = zeroSave;
}
}
/*
* Combine terms
*/
/* See if this function has been previously applied */
for(j = 0; j < i; ++j) {
unsigned prev_func = j < 3 ? blend->rt[rt].rgb_func : blend->rt[rt].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];
}
}
}
