| /* |
| * Copyright 2014 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "glsl/GrGLSLShaderBuilder.h" |
| #include "glsl/GrGLSLCaps.h" |
| #include "glsl/GrGLSLShaderVar.h" |
| #include "glsl/GrGLSLTextureSampler.h" |
| #include "glsl/GrGLSLProgramBuilder.h" |
| |
| static void map_swizzle(const char* swizzleMap, const char* swizzle, char* mangledSwizzle) { |
| int i; |
| for (i = 0; '\0' != swizzle[i]; ++i) { |
| switch (swizzle[i]) { |
| case 'r': |
| mangledSwizzle[i] = swizzleMap[0]; |
| break; |
| case 'g': |
| mangledSwizzle[i] = swizzleMap[1]; |
| break; |
| case 'b': |
| mangledSwizzle[i] = swizzleMap[2]; |
| break; |
| case 'a': |
| mangledSwizzle[i] = swizzleMap[3]; |
| break; |
| default: |
| SkFAIL("Unsupported swizzle"); |
| } |
| } |
| mangledSwizzle[i] ='\0'; |
| } |
| |
| static void append_texture_lookup(SkString* out, |
| const GrGLSLCaps* glslCaps, |
| const char* samplerName, |
| const char* coordName, |
| GrPixelConfig config, |
| const char* swizzle, |
| GrSLType varyingType = kVec2f_GrSLType) { |
| SkASSERT(coordName); |
| |
| out->appendf("%s(%s, %s)", |
| GrGLSLTexture2DFunctionName(varyingType, glslCaps->generation()), |
| samplerName, |
| coordName); |
| |
| char mangledSwizzle[5]; |
| |
| // This refers to any swizzling we may need to get from some backend internal format to the |
| // format used in GrPixelConfig. Some backends will automatically do the sizzling for us. |
| if (glslCaps->mustSwizzleInShader()) { |
| const char* swizzleMap = glslCaps->getSwizzleMap(config); |
| // if the map is simply 'rgba' then we don't need to do any manual swizzling to get us to |
| // a GrPixelConfig format. |
| if (memcmp(swizzleMap, "rgba", 4)) { |
| // Manually 'swizzle' the swizzle using our mapping |
| map_swizzle(swizzleMap, swizzle, mangledSwizzle); |
| swizzle = mangledSwizzle; |
| } |
| } |
| |
| // For shader prettiness we omit the swizzle rather than appending ".rgba". |
| if (memcmp(swizzle, "rgba", 4)) { |
| out->appendf(".%s", swizzle); |
| } |
| } |
| |
| GrGLSLShaderBuilder::GrGLSLShaderBuilder(GrGLSLProgramBuilder* program) |
| : fProgramBuilder(program) |
| , fInputs(GrGLSLProgramBuilder::kVarsPerBlock) |
| , fOutputs(GrGLSLProgramBuilder::kVarsPerBlock) |
| , fFeaturesAddedMask(0) |
| , fCodeIndex(kCode) |
| , fFinalized(false) { |
| // We push back some dummy pointers which will later become our header |
| for (int i = 0; i <= kCode; i++) { |
| fShaderStrings.push_back(); |
| fCompilerStrings.push_back(nullptr); |
| fCompilerStringLengths.push_back(0); |
| } |
| |
| this->main() = "void main() {"; |
| } |
| |
| void GrGLSLShaderBuilder::declAppend(const GrGLSLShaderVar& var) { |
| SkString tempDecl; |
| var.appendDecl(fProgramBuilder->glslCaps(), &tempDecl); |
| this->codeAppendf("%s;", tempDecl.c_str()); |
| } |
| |
| void GrGLSLShaderBuilder::emitFunction(GrSLType returnType, |
| const char* name, |
| int argCnt, |
| const GrGLSLShaderVar* args, |
| const char* body, |
| SkString* outName) { |
| this->functions().append(GrGLSLTypeString(returnType)); |
| fProgramBuilder->nameVariable(outName, '\0', name); |
| this->functions().appendf(" %s", outName->c_str()); |
| this->functions().append("("); |
| for (int i = 0; i < argCnt; ++i) { |
| args[i].appendDecl(fProgramBuilder->glslCaps(), &this->functions()); |
| if (i < argCnt - 1) { |
| this->functions().append(", "); |
| } |
| } |
| this->functions().append(") {\n"); |
| this->functions().append(body); |
| this->functions().append("}\n\n"); |
| } |
| |
| void GrGLSLShaderBuilder::appendTextureLookup(SkString* out, |
| const GrGLSLTextureSampler& sampler, |
| const char* coordName, |
| GrSLType varyingType) const { |
| append_texture_lookup(out, |
| fProgramBuilder->glslCaps(), |
| fProgramBuilder->getUniformCStr(sampler.fSamplerUniform), |
| coordName, |
| sampler.config(), |
| sampler.swizzle(), |
| varyingType); |
| } |
| |
| void GrGLSLShaderBuilder::appendTextureLookup(const GrGLSLTextureSampler& sampler, |
| const char* coordName, |
| GrSLType varyingType) { |
| this->appendTextureLookup(&this->code(), sampler, coordName, varyingType); |
| } |
| |
| void GrGLSLShaderBuilder::appendTextureLookupAndModulate(const char* modulation, |
| const GrGLSLTextureSampler& sampler, |
| const char* coordName, |
| GrSLType varyingType) { |
| SkString lookup; |
| this->appendTextureLookup(&lookup, sampler, coordName, varyingType); |
| this->codeAppend((GrGLSLExpr4(modulation) * GrGLSLExpr4(lookup)).c_str()); |
| } |
| |
| void GrGLSLShaderBuilder::addFeature(uint32_t featureBit, const char* extensionName) { |
| if (!(featureBit & fFeaturesAddedMask)) { |
| this->extensions().appendf("#extension %s: require\n", extensionName); |
| fFeaturesAddedMask |= featureBit; |
| } |
| } |
| |
| void GrGLSLShaderBuilder::appendDecls(const VarArray& vars, SkString* out) const { |
| for (int i = 0; i < vars.count(); ++i) { |
| vars[i].appendDecl(fProgramBuilder->glslCaps(), out); |
| out->append(";\n"); |
| } |
| } |
| |
| void GrGLSLShaderBuilder::addLayoutQualifier(const char* param, InterfaceQualifier interface) { |
| SkASSERT(fProgramBuilder->glslCaps()->generation() >= k330_GrGLSLGeneration || |
| fProgramBuilder->glslCaps()->mustEnableAdvBlendEqs()); |
| fLayoutParams[interface].push_back() = param; |
| } |
| |
| void GrGLSLShaderBuilder::compileAndAppendLayoutQualifiers() { |
| static const char* interfaceQualifierNames[] = { |
| "out" |
| }; |
| |
| for (int interface = 0; interface <= kLastInterfaceQualifier; ++interface) { |
| const SkTArray<SkString>& params = fLayoutParams[interface]; |
| if (params.empty()) { |
| continue; |
| } |
| this->layoutQualifiers().appendf("layout(%s", params[0].c_str()); |
| for (int i = 1; i < params.count(); ++i) { |
| this->layoutQualifiers().appendf(", %s", params[i].c_str()); |
| } |
| this->layoutQualifiers().appendf(") %s;\n", interfaceQualifierNames[interface]); |
| } |
| |
| GR_STATIC_ASSERT(0 == GrGLSLShaderBuilder::kOut_InterfaceQualifier); |
| GR_STATIC_ASSERT(SK_ARRAY_COUNT(interfaceQualifierNames) == kLastInterfaceQualifier + 1); |
| } |
| |
| void GrGLSLShaderBuilder::finalize(uint32_t visibility) { |
| SkASSERT(!fFinalized); |
| this->versionDecl() = fProgramBuilder->glslCaps()->versionDeclString(); |
| this->compileAndAppendLayoutQualifiers(); |
| SkASSERT(visibility); |
| fProgramBuilder->appendUniformDecls((GrGLSLProgramBuilder::ShaderVisibility) visibility, |
| &this->uniforms()); |
| this->appendDecls(fInputs, &this->inputs()); |
| // We should not have any outputs in the fragment shader when using version 1.10 |
| SkASSERT(GrGLSLProgramBuilder::kFragment_Visibility != visibility || |
| k110_GrGLSLGeneration != fProgramBuilder->glslCaps()->generation() || |
| fOutputs.empty()); |
| this->appendDecls(fOutputs, &this->outputs()); |
| this->onFinalize(); |
| // append the 'footer' to code |
| this->code().append("}"); |
| |
| for (int i = 0; i <= fCodeIndex; i++) { |
| fCompilerStrings[i] = fShaderStrings[i].c_str(); |
| fCompilerStringLengths[i] = (int)fShaderStrings[i].size(); |
| } |
| |
| fFinalized = true; |
| } |
| |