/**************************************************************************
*
* 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.
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**************************************************************************/
/**
* @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 "util/u_debug.h"
#include "util/u_format.h"
#include "gallivm/lp_bld_type.h"
#include "gallivm/lp_bld_const.h"
#include "gallivm/lp_bld_arit.h"
#include "gallivm/lp_bld_logic.h"
#include "gallivm/lp_bld_swizzle.h"
#include "gallivm/lp_bld_bitarit.h"
#include "gallivm/lp_bld_debug.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_aos_context
{
struct lp_build_context base;
LLVMValueRef src;
LLVMValueRef src_alpha;
LLVMValueRef src1;
LLVMValueRef src1_alpha;
LLVMValueRef dst;
LLVMValueRef const_;
LLVMValueRef const_alpha;
boolean has_dst_alpha;
LLVMValueRef inv_src;
LLVMValueRef inv_src_alpha;
LLVMValueRef inv_dst;
LLVMValueRef inv_const;
LLVMValueRef inv_const_alpha;
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)
{
LLVMValueRef src_alpha = bld->src_alpha ? bld->src_alpha : bld->src;
LLVMValueRef src1_alpha = bld->src1_alpha ? bld->src1_alpha : bld->src1;
LLVMValueRef const_alpha = bld->const_alpha ? bld->const_alpha : bld->const_;
switch (factor) {
case PIPE_BLENDFACTOR_ZERO:
return bld->base.zero;
case PIPE_BLENDFACTOR_ONE:
return bld->base.one;
case PIPE_BLENDFACTOR_SRC_COLOR:
return bld->src;
case PIPE_BLENDFACTOR_SRC_ALPHA:
return src_alpha;
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 there's no dst alpha the complement is zero but for unclamped
* float inputs (or snorm inputs) min can be non-zero (negative).
*/
if (!bld->saturate) {
if (!bld->has_dst_alpha) {
bld->saturate = lp_build_min(&bld->base, src_alpha, bld->base.zero);
}
else if (bld->base.type.norm && bld->base.type.sign) {
/*
* The complement/min totally doesn't work, since
* the complement is in range [0,2] but the other
* min input is [-1,1]. However, we can just clamp to 0
* before doing the complement...
*/
LLVMValueRef inv_dst;
inv_dst = lp_build_max(&bld->base, bld->base.zero, bld->dst);
inv_dst = lp_build_comp(&bld->base, inv_dst);
bld->saturate = lp_build_min(&bld->base, src_alpha, inv_dst);
} else {
if (!bld->inv_dst) {
bld->inv_dst = lp_build_comp(&bld->base, bld->dst);
}
bld->saturate = lp_build_min(&bld->base, src_alpha, bld->inv_dst);
}
}
return bld->saturate;
}
case PIPE_BLENDFACTOR_CONST_COLOR:
return bld->const_;
case PIPE_BLENDFACTOR_CONST_ALPHA:
return const_alpha;
case PIPE_BLENDFACTOR_SRC1_COLOR:
return bld->src1;
case PIPE_BLENDFACTOR_SRC1_ALPHA:
return src1_alpha;
case PIPE_BLENDFACTOR_INV_SRC_COLOR:
if (!bld->inv_src)
bld->inv_src = lp_build_comp(&bld->base, bld->src);
return bld->inv_src;
case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
if (!bld->inv_src_alpha)
bld->inv_src_alpha = lp_build_comp(&bld->base, src_alpha);
return bld->inv_src_alpha;
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:
if (!bld->inv_const)
bld->inv_const = lp_build_comp(&bld->base, bld->const_);
return bld->inv_const;
case PIPE_BLENDFACTOR_INV_CONST_ALPHA:
if (!bld->inv_const_alpha)
bld->inv_const_alpha = lp_build_comp(&bld->base, const_alpha);
return bld->inv_const_alpha;
case PIPE_BLENDFACTOR_INV_SRC1_COLOR:
return lp_build_comp(&bld->base, bld->src1);
case PIPE_BLENDFACTOR_INV_SRC1_ALPHA:
return lp_build_comp(&bld->base, src1_alpha);
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,
unsigned num_channels)
{
LLVMValueRef swizzled_rgb;
switch (rgb_swizzle) {
case LP_BUILD_BLEND_SWIZZLE_RGBA:
swizzled_rgb = rgb;
break;
case LP_BUILD_BLEND_SWIZZLE_AAAA:
swizzled_rgb = lp_build_swizzle_scalar_aos(&bld->base, rgb, alpha_swizzle, num_channels);
break;
default:
assert(0);
swizzled_rgb = bld->base.undef;
}
if (rgb != alpha) {
swizzled_rgb = lp_build_select_aos(&bld->base, 1 << alpha_swizzle,
alpha, swizzled_rgb,
num_channels);
}
return swizzled_rgb;
}
/**
* @sa http://www.opengl.org/sdk/docs/man/xhtml/glBlendFuncSeparate.xml
*/
static LLVMValueRef
lp_build_blend_factor(struct lp_build_blend_aos_context *bld,
unsigned rgb_factor,
unsigned alpha_factor,
unsigned alpha_swizzle,
unsigned num_channels)
{
LLVMValueRef rgb_factor_, alpha_factor_;
enum lp_build_blend_swizzle rgb_swizzle;
if (alpha_swizzle == PIPE_SWIZZLE_X && num_channels == 1) {
return lp_build_blend_factor_unswizzled(bld, alpha_factor, TRUE);
}
rgb_factor_ = lp_build_blend_factor_unswizzled(bld, rgb_factor, FALSE);
if (alpha_swizzle != PIPE_SWIZZLE_NONE) {
rgb_swizzle = lp_build_blend_factor_swizzle(rgb_factor);
alpha_factor_ = lp_build_blend_factor_unswizzled(bld, alpha_factor, TRUE);
return lp_build_blend_swizzle(bld, rgb_factor_, alpha_factor_, rgb_swizzle,
alpha_swizzle, num_channels);
} else {
return rgb_factor_;
}
}
/**
* 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 = PIPE_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;
bld.has_dst_alpha = FALSE;
/* Find the alpha channel if not provided separately */
if (!src_alpha) {
for (i = 0; i < 4; ++i) {
if (swizzle[i] == 3) {
alpha_swizzle = i;
}
}
/*
* Note that we may get src_alpha included from source (and 4 channels)
* even if the destination doesn't have an alpha channel (for rgbx
* formats). Generally this shouldn't make much of a difference (we're
* relying on blend factors being sanitized already if there's no
* dst alpha).
*/
bld.has_dst_alpha = desc->swizzle[3] <= PIPE_SWIZZLE_W;
}
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;
boolean alpha_only = nr_channels == 1 && alpha_swizzle == PIPE_SWIZZLE_X;
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,
alpha_only ? state->alpha_src_factor : state->rgb_src_factor,
alpha_only ? state->alpha_dst_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 != PIPE_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;
}