109 lines
3.6 KiB
C++
109 lines
3.6 KiB
C++
//
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// Copyright Contributors to the MaterialX Project
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// SPDX-License-Identifier: Apache-2.0
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//
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#include <MaterialXGenGlsl/EsslShaderGenerator.h>
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#include <MaterialXGenGlsl/EsslSyntax.h>
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#include <MaterialXGenShader/Nodes/HwImageNode.h>
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MATERIALX_NAMESPACE_BEGIN
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const string EsslShaderGenerator::TARGET = "essl";
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const string EsslShaderGenerator::VERSION = "300 es"; // Current target is WebGL 2.0
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EsslShaderGenerator::EsslShaderGenerator() :
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GlslShaderGenerator()
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{
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_syntax = EsslSyntax::create();
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// Add in ESSL specific keywords
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const StringSet reservedWords = { "precision", "highp", "mediump", "lowp" };
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_syntax->registerReservedWords(reservedWords);
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}
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void EsslShaderGenerator::emitDirectives(GenContext&, ShaderStage& stage) const
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{
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emitLine("#version " + getVersion(), stage, false);
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emitLineBreak(stage);
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emitLine("precision mediump float", stage);
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}
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void EsslShaderGenerator::emitUniforms(GenContext& context, ShaderStage& stage) const
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{
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for (const auto& it : stage.getUniformBlocks())
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{
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const VariableBlock& uniforms = *it.second;
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// Skip light uniforms as they are handled separately
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if (!uniforms.empty() && uniforms.getName() != HW::LIGHT_DATA)
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{
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emitComment("Uniform block: " + uniforms.getName(), stage);
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emitVariableDeclarations(uniforms, _syntax->getUniformQualifier(), Syntax::SEMICOLON, context, stage, false);
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emitLineBreak(stage);
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}
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}
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}
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void EsslShaderGenerator::emitInputs(GenContext& context, ShaderStage& stage) const
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{
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DEFINE_SHADER_STAGE(stage, Stage::VERTEX)
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{
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const VariableBlock& vertexInputs = stage.getInputBlock(HW::VERTEX_INPUTS);
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if (!vertexInputs.empty())
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{
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emitComment("Inputs block: " + vertexInputs.getName(), stage);
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emitVariableDeclarations(vertexInputs, _syntax->getInputQualifier(), Syntax::SEMICOLON, context, stage, false);
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emitLineBreak(stage);
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}
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}
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DEFINE_SHADER_STAGE(stage, Stage::PIXEL)
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{
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const VariableBlock& vertexData = stage.getInputBlock(HW::VERTEX_DATA);
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if (!vertexData.empty())
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{
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emitVariableDeclarations(vertexData, _syntax->getInputQualifier(), Syntax::SEMICOLON, context, stage, false);
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emitLineBreak(stage);
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}
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}
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}
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void EsslShaderGenerator::emitOutputs(GenContext& context, ShaderStage& stage) const
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{
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DEFINE_SHADER_STAGE(stage, Stage::VERTEX)
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{
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const VariableBlock& vertexData = stage.getOutputBlock(HW::VERTEX_DATA);
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if (!vertexData.empty())
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{
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emitVariableDeclarations(vertexData, _syntax->getOutputQualifier(), Syntax::SEMICOLON, context, stage, false);
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emitLineBreak(stage);
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}
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}
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DEFINE_SHADER_STAGE(stage, Stage::PIXEL)
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{
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emitComment("Pixel shader outputs", stage);
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const VariableBlock& outputs = stage.getOutputBlock(HW::PIXEL_OUTPUTS);
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emitVariableDeclarations(outputs, _syntax->getOutputQualifier(), Syntax::SEMICOLON, context, stage, false);
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emitLineBreak(stage);
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}
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}
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string EsslShaderGenerator::getVertexDataPrefix(const VariableBlock&) const
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{
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return EMPTY_STRING;
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}
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HwResourceBindingContextPtr EsslShaderGenerator::getResourceBindingContext(GenContext& context) const
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{
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HwResourceBindingContextPtr resoureBindingCtx = GlslShaderGenerator::getResourceBindingContext(context);
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if (resoureBindingCtx)
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{
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throw ExceptionShaderGenError("The EsslShaderGenerator does not support resource binding.");
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}
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return nullptr;
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}
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MATERIALX_NAMESPACE_END
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