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/*
* Copyright 2015 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrXferProcessor.h"
#include "gl/GrGLCaps.h"
GrXferProcessor::GrXferProcessor()
: fWillReadDstColor(false), fReadsCoverage(true), fDstTextureOffset() {
}
GrXferProcessor::GrXferProcessor(const DstTexture* dstTexture, bool willReadDstColor)
: fWillReadDstColor(willReadDstColor)
, fReadsCoverage(true)
, fDstTextureOffset() {
if (dstTexture && dstTexture->texture()) {
fDstTexture.reset(dstTexture->texture());
fDstTextureOffset = dstTexture->offset();
this->addTextureAccess(&fDstTexture);
this->setWillReadFragmentPosition();
}
}
GrXferProcessor::OptFlags GrXferProcessor::getOptimizations(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
bool doesStencilWrite,
GrColor* overrideColor,
const GrCaps& caps) {
GrXferProcessor::OptFlags flags = this->onGetOptimizations(colorPOI,
coveragePOI,
doesStencilWrite,
overrideColor,
caps);
if (flags & GrXferProcessor::kIgnoreCoverage_OptFlag) {
fReadsCoverage = false;
}
return flags;
}
void GrXferProcessor::getGLProcessorKey(const GrGLSLCaps& caps, GrProcessorKeyBuilder* b) const {
uint32_t key = this->willReadDstColor() ? 0x1 : 0x0;
if (this->getDstTexture() &&
kTopLeft_GrSurfaceOrigin == this->getDstTexture()->origin()) {
key |= 0x2;
}
b->add32(key);
this->onGetGLProcessorKey(caps, b);
}
bool GrXferProcessor::willNeedXferBarrier(const GrRenderTarget* rt,
const GrCaps& caps,
GrXferBarrierType* outBarrierType) const {
if (static_cast<const GrSurface*>(rt) == this->getDstTexture()) {
// Texture barriers are required when a shader reads and renders to the same texture.
SkASSERT(rt);
SkASSERT(caps.textureBarrierSupport());
*outBarrierType = kTexture_GrXferBarrierType;
return true;
}
return this->onWillNeedXferBarrier(rt, caps, outBarrierType);
}
#ifdef SK_DEBUG
static const char* equation_string(GrBlendEquation eq) {
switch (eq) {
case kAdd_GrBlendEquation:
return "add";
case kSubtract_GrBlendEquation:
return "subtract";
case kReverseSubtract_GrBlendEquation:
return "reverse_subtract";
case kScreen_GrBlendEquation:
return "screen";
case kOverlay_GrBlendEquation:
return "overlay";
case kDarken_GrBlendEquation:
return "darken";
case kLighten_GrBlendEquation:
return "lighten";
case kColorDodge_GrBlendEquation:
return "color_dodge";
case kColorBurn_GrBlendEquation:
return "color_burn";
case kHardLight_GrBlendEquation:
return "hard_light";
case kSoftLight_GrBlendEquation:
return "soft_light";
case kDifference_GrBlendEquation:
return "difference";
case kExclusion_GrBlendEquation:
return "exclusion";
case kMultiply_GrBlendEquation:
return "multiply";
case kHSLHue_GrBlendEquation:
return "hsl_hue";
case kHSLSaturation_GrBlendEquation:
return "hsl_saturation";
case kHSLColor_GrBlendEquation:
return "hsl_color";
case kHSLLuminosity_GrBlendEquation:
return "hsl_luminosity";
};
return "";
}
static const char* coeff_string(GrBlendCoeff coeff) {
switch (coeff) {
case kZero_GrBlendCoeff:
return "zero";
case kOne_GrBlendCoeff:
return "one";
case kSC_GrBlendCoeff:
return "src_color";
case kISC_GrBlendCoeff:
return "inv_src_color";
case kDC_GrBlendCoeff:
return "dst_color";
case kIDC_GrBlendCoeff:
return "inv_dst_color";
case kSA_GrBlendCoeff:
return "src_alpha";
case kISA_GrBlendCoeff:
return "inv_src_alpha";
case kDA_GrBlendCoeff:
return "dst_alpha";
case kIDA_GrBlendCoeff:
return "inv_dst_alpha";
case kConstC_GrBlendCoeff:
return "const_color";
case kIConstC_GrBlendCoeff:
return "inv_const_color";
case kConstA_GrBlendCoeff:
return "const_alpha";
case kIConstA_GrBlendCoeff:
return "inv_const_alpha";
case kS2C_GrBlendCoeff:
return "src2_color";
case kIS2C_GrBlendCoeff:
return "inv_src2_color";
case kS2A_GrBlendCoeff:
return "src2_alpha";
case kIS2A_GrBlendCoeff:
return "inv_src2_alpha";
}
return "";
}
SkString GrXferProcessor::BlendInfo::dump() const {
SkString out;
out.printf("write_color(%d) equation(%s) src_coeff(%s) dst_coeff:(%s) const(0x%08x)",
fWriteColor, equation_string(fEquation), coeff_string(fSrcBlend),
coeff_string(fDstBlend), fBlendConstant);
return out;
}
#endif
///////////////////////////////////////////////////////////////////////////////
GrXferProcessor* GrXPFactory::createXferProcessor(const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI,
const DstTexture* dstTexture,
const GrCaps& caps) const {
#ifdef SK_DEBUG
if (this->willReadDstColor(caps, colorPOI, coveragePOI)) {
if (!caps.shaderCaps()->dstReadInShaderSupport()) {
SkASSERT(dstTexture && dstTexture->texture());
} else {
SkASSERT(!dstTexture || !dstTexture->texture());
}
} else {
SkASSERT(!dstTexture || !dstTexture->texture());
}
#endif
return this->onCreateXferProcessor(caps, colorPOI, coveragePOI, dstTexture);
}
bool GrXPFactory::willNeedDstTexture(const GrCaps& caps, const GrProcOptInfo& colorPOI,
const GrProcOptInfo& coveragePOI) const {
return (this->willReadDstColor(caps, colorPOI, coveragePOI)
&& !caps.shaderCaps()->dstReadInShaderSupport());
}
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