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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 "src/gpu/GrShaderCaps.h"
#include "src/gpu/glsl/GrGLSLProgramBuilder.h"
#include "src/gpu/glsl/GrGLSLVarying.h"
void GrGLSLVaryingHandler::addPassThroughAttribute(const GrGeometryProcessor::Attribute& input,
const char* output,
Interpolation interpolation) {
SkASSERT(input.isInitialized());
SkASSERT(!fProgramBuilder->geometryProcessor().willUseGeoShader());
GrGLSLVarying v(input.gpuType());
this->addVarying(input.name(), &v, interpolation);
fProgramBuilder->fVS.codeAppendf("%s = %s;", v.vsOut(), input.name());
fProgramBuilder->fFS.codeAppendf("%s = %s;", output, v.fsIn());
}
static bool use_flat_interpolation(GrGLSLVaryingHandler::Interpolation interpolation,
const GrShaderCaps& shaderCaps) {
switch (interpolation) {
using Interpolation = GrGLSLVaryingHandler::Interpolation;
case Interpolation::kInterpolated:
return false;
case Interpolation::kCanBeFlat:
SkASSERT(!shaderCaps.preferFlatInterpolation() ||
shaderCaps.flatInterpolationSupport());
return shaderCaps.preferFlatInterpolation();
case Interpolation::kMustBeFlat:
SkASSERT(shaderCaps.flatInterpolationSupport());
return true;
}
SK_ABORT("Invalid interpolation");
}
void GrGLSLVaryingHandler::addVarying(const char* name, GrGLSLVarying* varying,
Interpolation interpolation) {
SkASSERT(GrSLTypeIsFloatType(varying->type()) || Interpolation::kMustBeFlat == interpolation);
bool willUseGeoShader = fProgramBuilder->geometryProcessor().willUseGeoShader();
VaryingInfo& v = fVaryings.push_back();
SkASSERT(varying);
SkASSERT(kVoid_GrSLType != varying->fType);
v.fType = varying->fType;
v.fIsFlat = use_flat_interpolation(interpolation, *fProgramBuilder->shaderCaps());
v.fVsOut = fProgramBuilder->nameVariable('v', name);
v.fVisibility = kNone_GrShaderFlags;
if (varying->isInVertexShader()) {
varying->fVsOut = v.fVsOut.c_str();
v.fVisibility |= kVertex_GrShaderFlag;
}
if (willUseGeoShader) {
v.fGsOut = fProgramBuilder->nameVariable('g', name);
varying->fGsIn = v.fVsOut.c_str();
varying->fGsOut = v.fGsOut.c_str();
v.fVisibility |= kGeometry_GrShaderFlag;
}
if (varying->isInFragmentShader()) {
varying->fFsIn = (willUseGeoShader ? v.fGsOut : v.fVsOut).c_str();
v.fVisibility |= kFragment_GrShaderFlag;
}
}
void GrGLSLVaryingHandler::emitAttributes(const GrGeometryProcessor& gp) {
for (const auto& attr : gp.vertexAttributes()) {
this->addAttribute(attr.asShaderVar());
}
for (const auto& attr : gp.instanceAttributes()) {
this->addAttribute(attr.asShaderVar());
}
}
void GrGLSLVaryingHandler::addAttribute(const GrShaderVar& var) {
SkASSERT(GrShaderVar::TypeModifier::In == var.getTypeModifier());
for (const GrShaderVar& attr : fVertexInputs.items()) {
// if attribute already added, don't add it again
if (attr.getName().equals(var.getName())) {
return;
}
}
fVertexInputs.push_back(var);
}
void GrGLSLVaryingHandler::setNoPerspective() {
const GrShaderCaps& caps = *fProgramBuilder->shaderCaps();
if (!caps.noperspectiveInterpolationSupport()) {
return;
}
if (const char* extension = caps.noperspectiveInterpolationExtensionString()) {
int bit = 1 << GrGLSLShaderBuilder::kNoPerspectiveInterpolation_GLSLPrivateFeature;
fProgramBuilder->fVS.addFeature(bit, extension);
if (fProgramBuilder->geometryProcessor().willUseGeoShader()) {
fProgramBuilder->fGS.addFeature(bit, extension);
}
fProgramBuilder->fFS.addFeature(bit, extension);
}
fDefaultInterpolationModifier = "noperspective";
}
void GrGLSLVaryingHandler::finalize() {
for (const VaryingInfo& v : fVaryings.items()) {
const char* modifier = v.fIsFlat ? "flat" : fDefaultInterpolationModifier;
if (v.fVisibility & kVertex_GrShaderFlag) {
fVertexOutputs.emplace_back(v.fVsOut, v.fType, GrShaderVar::TypeModifier::Out,
GrShaderVar::kNonArray, SkString(), SkString(modifier));
if (v.fVisibility & kGeometry_GrShaderFlag) {
fGeomInputs.emplace_back(v.fVsOut, v.fType, GrShaderVar::TypeModifier::In,
GrShaderVar::kUnsizedArray, SkString(), SkString(modifier));
}
}
if (v.fVisibility & kFragment_GrShaderFlag) {
const char* fsIn = v.fVsOut.c_str();
if (v.fVisibility & kGeometry_GrShaderFlag) {
fGeomOutputs.emplace_back(v.fGsOut, v.fType, GrShaderVar::TypeModifier::Out,
GrShaderVar::kNonArray, SkString(), SkString(modifier));
fsIn = v.fGsOut.c_str();
}
fFragInputs.emplace_back(SkString(fsIn), v.fType, GrShaderVar::TypeModifier::In,
GrShaderVar::kNonArray, SkString(), SkString(modifier));
}
}
this->onFinalize();
}
void GrGLSLVaryingHandler::appendDecls(const VarArray& vars, SkString* out) const {
for (const GrShaderVar& varying : vars.items()) {
varying.appendDecl(fProgramBuilder->shaderCaps(), out);
out->append(";");
}
}
void GrGLSLVaryingHandler::getVertexDecls(SkString* inputDecls, SkString* outputDecls) const {
this->appendDecls(fVertexInputs, inputDecls);
this->appendDecls(fVertexOutputs, outputDecls);
}
void GrGLSLVaryingHandler::getGeomDecls(SkString* inputDecls, SkString* outputDecls) const {
this->appendDecls(fGeomInputs, inputDecls);
this->appendDecls(fGeomOutputs, outputDecls);
}
void GrGLSLVaryingHandler::getFragDecls(SkString* inputDecls, SkString* outputDecls) const {
// We should not have any outputs in the fragment shader when using version 1.10
SkASSERT(k110_GrGLSLGeneration != fProgramBuilder->shaderCaps()->generation() ||
fFragOutputs.empty());
this->appendDecls(fFragInputs, inputDecls);
this->appendDecls(fFragOutputs, outputDecls);
}