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