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Diffstat (limited to 'gfx/angle/src/compiler/translator/TranslatorGLSL.cpp')
| -rwxr-xr-x | gfx/angle/src/compiler/translator/TranslatorGLSL.cpp | 298 |
1 files changed, 298 insertions, 0 deletions
diff --git a/gfx/angle/src/compiler/translator/TranslatorGLSL.cpp b/gfx/angle/src/compiler/translator/TranslatorGLSL.cpp new file mode 100755 index 000000000..1d6582b02 --- /dev/null +++ b/gfx/angle/src/compiler/translator/TranslatorGLSL.cpp @@ -0,0 +1,298 @@ +// +// Copyright (c) 2002-2013 The ANGLE Project Authors. All rights reserved. +// Use of this source code is governed by a BSD-style license that can be +// found in the LICENSE file. +// + +#include "compiler/translator/TranslatorGLSL.h" + +#include "angle_gl.h" +#include "compiler/translator/BuiltInFunctionEmulatorGLSL.h" +#include "compiler/translator/EmulatePrecision.h" +#include "compiler/translator/ExtensionGLSL.h" +#include "compiler/translator/OutputGLSL.h" +#include "compiler/translator/RewriteTexelFetchOffset.h" +#include "compiler/translator/VersionGLSL.h" + +namespace sh +{ + +TranslatorGLSL::TranslatorGLSL(sh::GLenum type, + ShShaderSpec spec, + ShShaderOutput output) + : TCompiler(type, spec, output) { +} + +void TranslatorGLSL::initBuiltInFunctionEmulator(BuiltInFunctionEmulator *emu, + ShCompileOptions compileOptions) +{ + if (compileOptions & SH_EMULATE_ABS_INT_FUNCTION) + { + InitBuiltInAbsFunctionEmulatorForGLSLWorkarounds(emu, getShaderType()); + } + + if (compileOptions & SH_EMULATE_ISNAN_FLOAT_FUNCTION) + { + InitBuiltInIsnanFunctionEmulatorForGLSLWorkarounds(emu, getShaderVersion()); + } + + int targetGLSLVersion = ShaderOutputTypeToGLSLVersion(getOutputType()); + InitBuiltInFunctionEmulatorForGLSLMissingFunctions(emu, getShaderType(), targetGLSLVersion); +} + +void TranslatorGLSL::translate(TIntermNode *root, ShCompileOptions compileOptions) +{ + TInfoSinkBase& sink = getInfoSink().obj; + + // Write GLSL version. + writeVersion(root); + + // Write extension behaviour as needed + writeExtensionBehavior(root); + + // Write pragmas after extensions because some drivers consider pragmas + // like non-preprocessor tokens. + writePragma(compileOptions); + + // If flattening the global invariant pragma, write invariant declarations for built-in + // variables. It should be harmless to do this twice in the case that the shader also explicitly + // did this. However, it's important to emit invariant qualifiers only for those built-in + // variables that are actually used, to avoid affecting the behavior of the shader. + if ((compileOptions & SH_FLATTEN_PRAGMA_STDGL_INVARIANT_ALL) && getPragma().stdgl.invariantAll) + { + ASSERT(wereVariablesCollected()); + + switch (getShaderType()) + { + case GL_VERTEX_SHADER: + sink << "invariant gl_Position;\n"; + + // gl_PointSize should be declared invariant in both ESSL 1.00 and 3.00 fragment + // shaders if it's statically referenced. + conditionallyOutputInvariantDeclaration("gl_PointSize"); + break; + case GL_FRAGMENT_SHADER: + // The preprocessor will reject this pragma if it's used in ESSL 3.00 fragment + // shaders, so we can use simple logic to determine whether to declare these + // variables invariant. + conditionallyOutputInvariantDeclaration("gl_FragCoord"); + conditionallyOutputInvariantDeclaration("gl_PointCoord"); + break; + default: + // Currently not reached, but leave this in for future expansion. + ASSERT(false); + break; + } + } + + if ((compileOptions & SH_REWRITE_TEXELFETCHOFFSET_TO_TEXELFETCH) != 0) + { + sh::RewriteTexelFetchOffset(root, getSymbolTable(), getShaderVersion()); + } + + bool precisionEmulation = getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision; + + if (precisionEmulation) + { + EmulatePrecision emulatePrecision(getSymbolTable(), getShaderVersion()); + root->traverse(&emulatePrecision); + emulatePrecision.updateTree(); + emulatePrecision.writeEmulationHelpers(sink, getShaderVersion(), getOutputType()); + } + + // Write emulated built-in functions if needed. + if (!getBuiltInFunctionEmulator().IsOutputEmpty()) + { + sink << "// BEGIN: Generated code for built-in function emulation\n\n"; + sink << "#define webgl_emu_precision\n\n"; + getBuiltInFunctionEmulator().OutputEmulatedFunctions(sink); + sink << "// END: Generated code for built-in function emulation\n\n"; + } + + // Write array bounds clamping emulation if needed. + getArrayBoundsClamper().OutputClampingFunctionDefinition(sink); + + // Declare gl_FragColor and glFragData as webgl_FragColor and webgl_FragData + // if it's core profile shaders and they are used. + if (getShaderType() == GL_FRAGMENT_SHADER) + { + const bool mayHaveESSL1SecondaryOutputs = + IsExtensionEnabled(getExtensionBehavior(), "GL_EXT_blend_func_extended") && + getShaderVersion() == 100; + const bool declareGLFragmentOutputs = IsGLSL130OrNewer(getOutputType()); + + bool hasGLFragColor = false; + bool hasGLFragData = false; + bool hasGLSecondaryFragColor = false; + bool hasGLSecondaryFragData = false; + + for (const auto &outputVar : outputVariables) + { + if (declareGLFragmentOutputs) + { + if (outputVar.name == "gl_FragColor") + { + ASSERT(!hasGLFragColor); + hasGLFragColor = true; + continue; + } + else if (outputVar.name == "gl_FragData") + { + ASSERT(!hasGLFragData); + hasGLFragData = true; + continue; + } + } + if (mayHaveESSL1SecondaryOutputs) + { + if (outputVar.name == "gl_SecondaryFragColorEXT") + { + ASSERT(!hasGLSecondaryFragColor); + hasGLSecondaryFragColor = true; + continue; + } + else if (outputVar.name == "gl_SecondaryFragDataEXT") + { + ASSERT(!hasGLSecondaryFragData); + hasGLSecondaryFragData = true; + continue; + } + } + } + ASSERT(!((hasGLFragColor || hasGLSecondaryFragColor) && + (hasGLFragData || hasGLSecondaryFragData))); + if (hasGLFragColor) + { + sink << "out vec4 webgl_FragColor;\n"; + } + if (hasGLFragData) + { + sink << "out vec4 webgl_FragData[gl_MaxDrawBuffers];\n"; + } + if (hasGLSecondaryFragColor) + { + sink << "out vec4 angle_SecondaryFragColor;\n"; + } + if (hasGLSecondaryFragData) + { + sink << "out vec4 angle_SecondaryFragData[" << getResources().MaxDualSourceDrawBuffers + << "];\n"; + } + } + + if (getShaderType() == GL_COMPUTE_SHADER && isComputeShaderLocalSizeDeclared()) + { + const sh::WorkGroupSize &localSize = getComputeShaderLocalSize(); + sink << "layout (local_size_x=" << localSize[0] << ", local_size_y=" << localSize[1] + << ", local_size_z=" << localSize[2] << ") in;\n"; + } + + // Write translated shader. + TOutputGLSL outputGLSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(), + getSymbolTable(), getShaderType(), getShaderVersion(), getOutputType(), + compileOptions); + root->traverse(&outputGLSL); +} + +bool TranslatorGLSL::shouldFlattenPragmaStdglInvariantAll() +{ + // Required when outputting to any GLSL version greater than 1.20, but since ANGLE doesn't + // translate to that version, return true for the next higher version. + return IsGLSL130OrNewer(getOutputType()); +} + +bool TranslatorGLSL::shouldCollectVariables(ShCompileOptions compileOptions) +{ + return (compileOptions & SH_FLATTEN_PRAGMA_STDGL_INVARIANT_ALL) || + TCompiler::shouldCollectVariables(compileOptions); +} + +void TranslatorGLSL::writeVersion(TIntermNode *root) +{ + TVersionGLSL versionGLSL(getShaderType(), getPragma(), getOutputType()); + root->traverse(&versionGLSL); + int version = versionGLSL.getVersion(); + // We need to write version directive only if it is greater than 110. + // If there is no version directive in the shader, 110 is implied. + if (version > 110) + { + TInfoSinkBase& sink = getInfoSink().obj; + sink << "#version " << version << "\n"; + } +} + +void TranslatorGLSL::writeExtensionBehavior(TIntermNode *root) +{ + TInfoSinkBase& sink = getInfoSink().obj; + const TExtensionBehavior& extBehavior = getExtensionBehavior(); + for (const auto &iter : extBehavior) + { + if (iter.second == EBhUndefined) + { + continue; + } + + if (getOutputType() == SH_GLSL_COMPATIBILITY_OUTPUT) + { + // For GLSL output, we don't need to emit most extensions explicitly, + // but some we need to translate in GL compatibility profile. + if (iter.first == "GL_EXT_shader_texture_lod") + { + sink << "#extension GL_ARB_shader_texture_lod : " << getBehaviorString(iter.second) + << "\n"; + } + + if (iter.first == "GL_EXT_draw_buffers") + { + sink << "#extension GL_ARB_draw_buffers : " << getBehaviorString(iter.second) + << "\n"; + } + } + } + + // GLSL ES 3 explicit location qualifiers need to use an extension before GLSL 330 + if (getShaderVersion() >= 300 && getOutputType() < SH_GLSL_330_CORE_OUTPUT) + { + sink << "#extension GL_ARB_explicit_attrib_location : require\n"; + } + + // Need to enable gpu_shader5 to have index constant sampler array indexing + if (getOutputType() != SH_ESSL_OUTPUT && getOutputType() < SH_GLSL_400_CORE_OUTPUT) + { + sink << "#extension GL_ARB_gpu_shader5 : "; + + // Don't use "require" on WebGL 1 to avoid breaking WebGL on drivers that silently + // support index constant sampler array indexing, but don't have the extension. + if (getShaderVersion() >= 300) + { + sink << "require\n"; + } + else + { + sink << "enable\n"; + } + } + + TExtensionGLSL extensionGLSL(getOutputType()); + root->traverse(&extensionGLSL); + + for (const auto &ext : extensionGLSL.getEnabledExtensions()) + { + sink << "#extension " << ext << " : enable\n"; + } + for (const auto &ext : extensionGLSL.getRequiredExtensions()) + { + sink << "#extension " << ext << " : require\n"; + } +} + +void TranslatorGLSL::conditionallyOutputInvariantDeclaration(const char *builtinVaryingName) +{ + if (isVaryingDefined(builtinVaryingName)) + { + TInfoSinkBase &sink = getInfoSink().obj; + sink << "invariant " << builtinVaryingName << ";\n"; + } +} + +} // namespace sh |