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/*
* Copyright 2014 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrGLSLFragmentShaderBuilder.h"
#include "GrRenderTarget.h"
#include "GrRenderTargetPriv.h"
#include "GrShaderCaps.h"
#include "gl/GrGLGpu.h"
#include "glsl/GrGLSLProgramBuilder.h"
#include "glsl/GrGLSLUniformHandler.h"
#include "glsl/GrGLSLVarying.h"
const char* GrGLSLFragmentShaderBuilder::kDstColorName = "_dstColor";
static const char* specific_layout_qualifier_name(GrBlendEquation equation) {
SkASSERT(GrBlendEquationIsAdvanced(equation));
static const char* kLayoutQualifierNames[] = {
"blend_support_screen",
"blend_support_overlay",
"blend_support_darken",
"blend_support_lighten",
"blend_support_colordodge",
"blend_support_colorburn",
"blend_support_hardlight",
"blend_support_softlight",
"blend_support_difference",
"blend_support_exclusion",
"blend_support_multiply",
"blend_support_hsl_hue",
"blend_support_hsl_saturation",
"blend_support_hsl_color",
"blend_support_hsl_luminosity"
};
return kLayoutQualifierNames[equation - kFirstAdvancedGrBlendEquation];
GR_STATIC_ASSERT(0 == kScreen_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(1 == kOverlay_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(2 == kDarken_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(3 == kLighten_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(4 == kColorDodge_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(5 == kColorBurn_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(6 == kHardLight_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(7 == kSoftLight_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(8 == kDifference_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(9 == kExclusion_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(10 == kMultiply_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(11 == kHSLHue_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(12 == kHSLSaturation_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(13 == kHSLColor_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(14 == kHSLLuminosity_GrBlendEquation - kFirstAdvancedGrBlendEquation);
GR_STATIC_ASSERT(SK_ARRAY_COUNT(kLayoutQualifierNames) ==
kGrBlendEquationCnt - kFirstAdvancedGrBlendEquation);
}
uint8_t GrGLSLFragmentShaderBuilder::KeyForSurfaceOrigin(GrSurfaceOrigin origin) {
SkASSERT(kTopLeft_GrSurfaceOrigin == origin || kBottomLeft_GrSurfaceOrigin == origin);
return origin + 1;
GR_STATIC_ASSERT(0 == kTopLeft_GrSurfaceOrigin);
GR_STATIC_ASSERT(1 == kBottomLeft_GrSurfaceOrigin);
}
GrGLSLFragmentShaderBuilder::GrGLSLFragmentShaderBuilder(GrGLSLProgramBuilder* program)
: GrGLSLFragmentBuilder(program)
, fSetupFragPosition(false)
, fHasCustomColorOutput(false)
, fCustomColorOutputIndex(-1)
, fHasSecondaryOutput(false)
, fForceHighPrecision(false) {
fSubstageIndices.push_back(0);
#ifdef SK_DEBUG
fHasReadDstColor = false;
#endif
}
SkString GrGLSLFragmentShaderBuilder::ensureCoords2D(const GrShaderVar& coords) {
if (kFloat3_GrSLType != coords.getType() && kHalf3_GrSLType != coords.getType()) {
SkASSERT(kFloat2_GrSLType == coords.getType() || kHalf2_GrSLType == coords.getType());
return coords.getName();
}
SkString coords2D;
coords2D.printf("%s_ensure2D", coords.c_str());
this->codeAppendf("\tfloat2 %s = %s.xy / %s.z;", coords2D.c_str(), coords.c_str(),
coords.c_str());
return coords2D;
}
const char* GrGLSLFragmentShaderBuilder::dstColor() {
SkDEBUGCODE(fHasReadDstColor = true;)
const char* override = fProgramBuilder->primitiveProcessor().getDestColorOverride();
if (override != nullptr) {
return override;
}
const GrShaderCaps* shaderCaps = fProgramBuilder->shaderCaps();
if (shaderCaps->fbFetchSupport()) {
this->addFeature(1 << kFramebufferFetch_GLSLPrivateFeature,
shaderCaps->fbFetchExtensionString());
// Some versions of this extension string require declaring custom color output on ES 3.0+
const char* fbFetchColorName = "sk_LastFragColor";
if (shaderCaps->fbFetchNeedsCustomOutput()) {
this->enableCustomOutput();
fOutputs[fCustomColorOutputIndex].setTypeModifier(GrShaderVar::kInOut_TypeModifier);
fbFetchColorName = DeclaredColorOutputName();
// Set the dstColor to an intermediate variable so we don't override it with the output
this->codeAppendf("half4 %s = %s;", kDstColorName, fbFetchColorName);
} else {
return fbFetchColorName;
}
}
return kDstColorName;
}
void GrGLSLFragmentShaderBuilder::enableAdvancedBlendEquationIfNeeded(GrBlendEquation equation) {
SkASSERT(GrBlendEquationIsAdvanced(equation));
const GrShaderCaps& caps = *fProgramBuilder->shaderCaps();
if (!caps.mustEnableAdvBlendEqs()) {
return;
}
this->addFeature(1 << kBlendEquationAdvanced_GLSLPrivateFeature,
"GL_KHR_blend_equation_advanced");
if (caps.mustEnableSpecificAdvBlendEqs()) {
this->addLayoutQualifier(specific_layout_qualifier_name(equation), kOut_InterfaceQualifier);
} else {
this->addLayoutQualifier("blend_support_all_equations", kOut_InterfaceQualifier);
}
}
void GrGLSLFragmentShaderBuilder::enableCustomOutput() {
if (!fHasCustomColorOutput) {
fHasCustomColorOutput = true;
fCustomColorOutputIndex = fOutputs.count();
fOutputs.push_back().set(kHalf4_GrSLType, DeclaredColorOutputName(),
GrShaderVar::kOut_TypeModifier);
fProgramBuilder->finalizeFragmentOutputColor(fOutputs.back());
}
}
void GrGLSLFragmentShaderBuilder::enableSecondaryOutput() {
SkASSERT(!fHasSecondaryOutput);
fHasSecondaryOutput = true;
const GrShaderCaps& caps = *fProgramBuilder->shaderCaps();
if (const char* extension = caps.secondaryOutputExtensionString()) {
this->addFeature(1 << kBlendFuncExtended_GLSLPrivateFeature, extension);
}
// If the primary output is declared, we must declare also the secondary output
// and vice versa, since it is not allowed to use a built-in gl_FragColor and a custom
// output. The condition also co-incides with the condition in whici GLES SL 2.0
// requires the built-in gl_SecondaryFragColorEXT, where as 3.0 requires a custom output.
if (caps.mustDeclareFragmentShaderOutput()) {
fOutputs.push_back().set(kHalf4_GrSLType, DeclaredSecondaryColorOutputName(),
GrShaderVar::kOut_TypeModifier);
fProgramBuilder->finalizeFragmentSecondaryColor(fOutputs.back());
}
}
const char* GrGLSLFragmentShaderBuilder::getPrimaryColorOutputName() const {
return fHasCustomColorOutput ? DeclaredColorOutputName() : "sk_FragColor";
}
bool GrGLSLFragmentShaderBuilder::primaryColorOutputIsInOut() const {
return fHasCustomColorOutput &&
fOutputs[fCustomColorOutputIndex].getTypeModifier() == GrShaderVar::kInOut_TypeModifier;
}
void GrGLSLFragmentBuilder::declAppendf(const char* fmt, ...) {
va_list argp;
va_start(argp, fmt);
inputs().appendVAList(fmt, argp);
va_end(argp);
}
const char* GrGLSLFragmentShaderBuilder::getSecondaryColorOutputName() const {
const GrShaderCaps& caps = *fProgramBuilder->shaderCaps();
return caps.mustDeclareFragmentShaderOutput() ? DeclaredSecondaryColorOutputName()
: "gl_SecondaryFragColorEXT";
}
GrSurfaceOrigin GrGLSLFragmentShaderBuilder::getSurfaceOrigin() const {
SkASSERT(fProgramBuilder->header().fSurfaceOriginKey);
return static_cast<GrSurfaceOrigin>(fProgramBuilder->header().fSurfaceOriginKey-1);
GR_STATIC_ASSERT(0 == kTopLeft_GrSurfaceOrigin);
GR_STATIC_ASSERT(1 == kBottomLeft_GrSurfaceOrigin);
}
void GrGLSLFragmentShaderBuilder::onFinalize() {
fProgramBuilder->varyingHandler()->getFragDecls(&this->inputs(), &this->outputs());
}
void GrGLSLFragmentShaderBuilder::onBeforeChildProcEmitCode() {
SkASSERT(fSubstageIndices.count() >= 1);
fSubstageIndices.push_back(0);
// second-to-last value in the fSubstageIndices stack is the index of the child proc
// at that level which is currently emitting code.
fMangleString.appendf("_c%d", fSubstageIndices[fSubstageIndices.count() - 2]);
}
void GrGLSLFragmentShaderBuilder::onAfterChildProcEmitCode() {
SkASSERT(fSubstageIndices.count() >= 2);
fSubstageIndices.pop_back();
fSubstageIndices.back()++;
int removeAt = fMangleString.findLastOf('_');
fMangleString.remove(removeAt, fMangleString.size() - removeAt);
}
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