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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 "GrShaderCaps.h"
#include "glsl/GrGLSLVarying.h"
#include "glsl/GrGLSLProgramBuilder.h"
void GrGLSLVaryingHandler::addPassThroughAttribute(const GrGeometryProcessor::Attribute& input,
const char* output,
Interpolation interpolation) {
SkASSERT(input.isInitialized());
SkASSERT(!fProgramBuilder->primitiveProcessor().willUseGeoShader());
GrSLType type = GrVertexAttribTypeToSLType(input.type());
GrGLSLVarying v(type);
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");
return false;
}
void GrGLSLVaryingHandler::addVarying(const char* name, GrGLSLVarying* varying,
Interpolation interpolation) {
SkASSERT(GrSLTypeIsFloatType(varying->type()) || Interpolation::kMustBeFlat == interpolation);
bool willUseGeoShader = fProgramBuilder->primitiveProcessor().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());
fProgramBuilder->nameVariable(&v.fVsOut, 'v', name);
v.fVisibility = kNone_GrShaderFlags;
if (varying->isInVertexShader()) {
varying->fVsOut = v.fVsOut.c_str();
v.fVisibility |= kVertex_GrShaderFlag;
}
if (willUseGeoShader) {
fProgramBuilder->nameVariable(&v.fGsOut, '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) {
int vaCount = gp.numVertexAttributes();
for (int i = 0; i < vaCount; i++) {
this->addAttribute(gp.vertexAttribute(i).asShaderVar());
}
int iaCount = gp.numInstanceAttributes();
for (int i = 0; i < iaCount; i++) {
this->addAttribute(gp.instanceAttribute(i).asShaderVar());
}
}
void GrGLSLVaryingHandler::addAttribute(const GrShaderVar& var) {
SkASSERT(GrShaderVar::kIn_TypeModifier == var.getTypeModifier());
for (int j = 0; j < fVertexInputs.count(); ++j) {
const GrShaderVar& attr = fVertexInputs[j];
// 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 << GrGLSLFragmentBuilder::kNoPerspectiveInterpolation_GLSLPrivateFeature;
fProgramBuilder->fVS.addFeature(bit, extension);
if (fProgramBuilder->primitiveProcessor().willUseGeoShader()) {
fProgramBuilder->fGS.addFeature(bit, extension);
}
fProgramBuilder->fFS.addFeature(bit, extension);
}
fDefaultInterpolationModifier = "noperspective";
}
void GrGLSLVaryingHandler::finalize() {
for (int i = 0; i < fVaryings.count(); ++i) {
const VaryingInfo& v = this->fVaryings[i];
const char* modifier = v.fIsFlat ? "flat" : fDefaultInterpolationModifier;
if (v.fVisibility & kVertex_GrShaderFlag) {
fVertexOutputs.push_back().set(v.fType, v.fVsOut, GrShaderVar::kOut_TypeModifier,
kDefault_GrSLPrecision, nullptr, modifier);
if (v.fVisibility & kGeometry_GrShaderFlag) {
fGeomInputs.push_back().set(v.fType, v.fVsOut, GrShaderVar::kUnsizedArray,
GrShaderVar::kIn_TypeModifier, kDefault_GrSLPrecision,
nullptr, modifier);
}
}
if (v.fVisibility & kFragment_GrShaderFlag) {
const char* fsIn = v.fVsOut.c_str();
if (v.fVisibility & kGeometry_GrShaderFlag) {
fGeomOutputs.push_back().set(v.fType, v.fGsOut, GrShaderVar::kOut_TypeModifier,
kDefault_GrSLPrecision, nullptr, modifier);
fsIn = v.fGsOut.c_str();
}
fFragInputs.push_back().set(v.fType, fsIn, GrShaderVar::kIn_TypeModifier,
kDefault_GrSLPrecision, nullptr, modifier);
}
}
this->onFinalize();
}
void GrGLSLVaryingHandler::appendDecls(const VarArray& vars, SkString* out) const {
for (int i = 0; i < vars.count(); ++i) {
vars[i].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);
}
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