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/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "GrShaderVar.h"
#include "GrShaderCaps.h"
static const char* type_modifier_string(GrShaderVar::TypeModifier t) {
switch (t) {
case GrShaderVar::kNone_TypeModifier: return "";
case GrShaderVar::kIn_TypeModifier: return "in";
case GrShaderVar::kInOut_TypeModifier: return "inout";
case GrShaderVar::kOut_TypeModifier: return "out";
case GrShaderVar::kUniform_TypeModifier: return "uniform";
}
SK_ABORT("Unknown shader variable type modifier.");
return "";
}
void GrShaderVar::setIOType(GrIOType ioType) {
switch (ioType) {
case kRW_GrIOType:
return;
case kRead_GrIOType:
this->addModifier("readonly");
return;
case kWrite_GrIOType:
this->addModifier("writeonly");
return;
}
SK_ABORT("Unknown io type.");
}
// Converts a GrSLPrecision to its corresponding GLSL precision qualifier. TODO: Remove this as we
// shouldn't need it with SkSL.
static inline const char* glsl_precision_string(GrSLPrecision p) {
switch (p) {
case kLow_GrSLPrecision:
return "lowp";
case kMedium_GrSLPrecision:
return "mediump";
case kHigh_GrSLPrecision:
return "highp";
case kDefault_GrSLPrecision:
return "";
}
SK_ABORT("Unexpected precision type.");
return "";
}
void GrShaderVar::appendDecl(const GrShaderCaps* shaderCaps, SkString* out) const {
SkASSERT(kDefault_GrSLPrecision == fPrecision || GrSLTypeTemporarilyAcceptsPrecision(fType));
SkString layout = fLayoutQualifier;
if (!fLayoutQualifier.isEmpty()) {
out->appendf("layout(%s) ", fLayoutQualifier.c_str());
}
out->append(fExtraModifiers);
if (this->getTypeModifier() != kNone_TypeModifier) {
out->append(type_modifier_string(this->getTypeModifier()));
out->append(" ");
}
GrSLType effectiveType = this->getType();
if (shaderCaps->usesPrecisionModifiers() && GrSLTypeAcceptsPrecision(effectiveType)) {
// Desktop GLSL has added precision qualifiers but they don't do anything.
out->appendf("%s ", glsl_precision_string(fPrecision));
}
if (this->isArray()) {
if (this->isUnsizedArray()) {
out->appendf("%s %s[]",
GrGLSLTypeString(shaderCaps, effectiveType),
this->getName().c_str());
} else {
SkASSERT(this->getArrayCount() > 0);
out->appendf("%s %s[%d]",
GrGLSLTypeString(shaderCaps, effectiveType),
this->getName().c_str(),
this->getArrayCount());
}
} else {
out->appendf("%s %s",
GrGLSLTypeString(shaderCaps, effectiveType),
this->getName().c_str());
}
}
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