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 &&
getShaderType() != GL_COMPUTE_SHADER)
{
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 &&
getShaderVersion() == 100)
{
// Don't use "require" on to avoid breaking WebGL 1 on drivers that silently
// support index constant sampler array indexing, but don't have the extension or
// on drivers that don't have the extension at all as it would break WebGL 1 for
// some users.
sink << "#extension GL_ARB_gpu_shader5 : 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::translate(TIntermNode *root, int) {
TInfoSinkBase& sink = getInfoSink().obj;
// Write GLSL version.
writeVersion(root);
writePragma();
// Write extension behaviour as needed
writeExtensionBehavior();
bool precisionEmulation = getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
if (precisionEmulation)
{
EmulatePrecision emulatePrecision;
root->traverse(&emulatePrecision);
emulatePrecision.updateTree();
emulatePrecision.writeEmulationHelpers(sink, 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 && IsGLSL130OrNewer(getOutputType()))
{
TFragmentOutSearcher searcher;
root->traverse(&searcher);
ASSERT(!(searcher.usesGlFragData() && searcher.usesGlFragColor()));
if (searcher.usesGlFragColor())
{
sink << "out vec4 webgl_FragColor;\n";
}
if (searcher.usesGlFragData())
{
sink << "out vec4 webgl_FragData[gl_MaxDrawBuffers];\n";
}
}
// Write translated shader.
TOutputGLSL outputGLSL(sink,
getArrayIndexClampingStrategy(),
getHashFunction(),
getNameMap(),
getSymbolTable(),
getShaderVersion(),
getOutputType());
root->traverse(&outputGLSL);
}
void TranslatorESSL::translate(TIntermNode *root, int) {
TInfoSinkBase& sink = getInfoSink().obj;
int shaderVer = getShaderVersion();
if (shaderVer > 100)
{
sink << "#version " << shaderVer << " es\n";
}
writePragma();
// Write built-in extension behaviors.
writeExtensionBehavior();
bool precisionEmulation = getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
if (precisionEmulation)
{
EmulatePrecision emulatePrecision(getSymbolTable(), shaderVer);
root->traverse(&emulatePrecision);
emulatePrecision.updateTree();
emulatePrecision.writeEmulationHelpers(sink, SH_ESSL_OUTPUT);
}
unsigned int temporaryIndex = 0;
RecordConstantPrecision(root, &temporaryIndex);
// Write emulated built-in functions if needed.
if (!getBuiltInFunctionEmulator().IsOutputEmpty())
{
sink << "// BEGIN: Generated code for built-in function emulation\n\n";
if (getShaderType() == GL_FRAGMENT_SHADER)
{
sink << "#if defined(GL_FRAGMENT_PRECISION_HIGH)\n"
<< "#define webgl_emu_precision highp\n"
<< "#else\n"
<< "#define webgl_emu_precision mediump\n"
<< "#endif\n\n";
}
else
{
sink << "#define webgl_emu_precision highp\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);
// Write translated shader.
TOutputESSL outputESSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(),
getSymbolTable(), shaderVer, precisionEmulation);
root->traverse(&outputESSL);
}
void TranslatorHLSL::translate(TIntermNode *root, int compileOptions)
{
const ShBuiltInResources &resources = getResources();
int numRenderTargets = resources.EXT_draw_buffers ? resources.MaxDrawBuffers : 1;
sh::OutputHLSL outputHLSL(getShaderType(), getShaderVersion(), getExtensionBehavior(),
getSourcePath(), getOutputType(), numRenderTargets, getUniforms(), compileOptions);
outputHLSL.output(root, getInfoSink().obj);
mInterfaceBlockRegisterMap = outputHLSL.getInterfaceBlockRegisterMap();
mUniformRegisterMap = outputHLSL.getUniformRegisterMap();
}
void TranslatorGLSL::translate(TIntermNode *root, int) {
TInfoSinkBase& sink = getInfoSink().obj;
// Write GLSL version.
writeVersion(root);
writePragma();
// Write extension behaviour as needed
writeExtensionBehavior();
bool precisionEmulation = getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
if (precisionEmulation)
{
EmulatePrecision emulatePrecision(getSymbolTable(), getShaderVersion());
root->traverse(&emulatePrecision);
emulatePrecision.updateTree();
emulatePrecision.writeEmulationHelpers(sink, 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 translated shader.
TOutputGLSL outputGLSL(sink,
getHashFunction(),
getNameMap(),
getSymbolTable(),
getShaderVersion(),
getOutputType());
root->traverse(&outputGLSL);
}
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::writeExtensionBehavior(TIntermNode *root)
{
TInfoSinkBase& sink = getInfoSink().obj;
const TExtensionBehavior& extBehavior = getExtensionBehavior();
for (const auto &iter : extBehavior)
{
if (iter.second == EBhUndefined)
{
continue;
}
// For GLSL output, we don't need to emit most extensions explicitly,
// but some we need to translate.
if (iter.first == "GL_EXT_shader_texture_lod")
{
sink << "#extension GL_ARB_shader_texture_lod : " << 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";
}
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 TranslatorESSL::translate(TIntermNode* root) {
TInfoSinkBase& sink = getInfoSink().obj;
writePragma();
// Write built-in extension behaviors.
writeExtensionBehavior();
// Write emulated built-in functions if needed.
getBuiltInFunctionEmulator().OutputEmulatedFunctionDefinition(
sink, getShaderType() == GL_FRAGMENT_SHADER);
// Write array bounds clamping emulation if needed.
getArrayBoundsClamper().OutputClampingFunctionDefinition(sink);
// Write translated shader.
TOutputESSL outputESSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(), getSymbolTable(), getShaderVersion());
root->traverse(&outputESSL);
}
void TranslatorGLSL::translate(TIntermNode *root, int compileOptions)
{
TInfoSinkBase& sink = getInfoSink().obj;
// Write GLSL version.
writeVersion(root);
writePragma();
// Write extension behaviour as needed
writeExtensionBehavior(root);
bool precisionEmulation = getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
if (precisionEmulation)
{
EmulatePrecision emulatePrecision(getSymbolTable(), getShaderVersion());
root->traverse(&emulatePrecision);
emulatePrecision.updateTree();
emulatePrecision.writeEmulationHelpers(sink, 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";
}
}
// Write translated shader.
TOutputGLSL outputGLSL(sink,
getArrayIndexClampingStrategy(),
getHashFunction(),
getNameMap(),
getSymbolTable(),
getShaderVersion(),
getOutputType());
root->traverse(&outputGLSL);
}
void TranslatorESSL::translate(TIntermBlock *root,
ShCompileOptions compileOptions,
PerformanceDiagnostics * /*perfDiagnostics*/)
{
TInfoSinkBase &sink = getInfoSink().obj;
int shaderVer = getShaderVersion();
if (shaderVer > 100)
{
sink << "#version " << shaderVer << " es\n";
}
// Write built-in extension behaviors.
writeExtensionBehavior(compileOptions);
// Write pragmas after extensions because some drivers consider pragmas
// like non-preprocessor tokens.
writePragma(compileOptions);
bool precisionEmulation =
getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
if (precisionEmulation)
{
EmulatePrecision emulatePrecision(&getSymbolTable());
root->traverse(&emulatePrecision);
emulatePrecision.updateTree();
emulatePrecision.writeEmulationHelpers(sink, shaderVer, SH_ESSL_OUTPUT);
}
RecordConstantPrecision(root, &getSymbolTable());
// Write emulated built-in functions if needed.
if (!getBuiltInFunctionEmulator().isOutputEmpty())
{
sink << "// BEGIN: Generated code for built-in function emulation\n\n";
if (getShaderType() == GL_FRAGMENT_SHADER)
{
sink << "#if defined(GL_FRAGMENT_PRECISION_HIGH)\n"
<< "#define emu_precision highp\n"
<< "#else\n"
<< "#define emu_precision mediump\n"
<< "#endif\n\n";
}
else
{
sink << "#define emu_precision highp\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);
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";
}
if (getShaderType() == GL_GEOMETRY_SHADER_EXT)
{
WriteGeometryShaderLayoutQualifiers(
sink, getGeometryShaderInputPrimitiveType(), getGeometryShaderInvocations(),
getGeometryShaderOutputPrimitiveType(), getGeometryShaderMaxVertices());
}
// Write translated shader.
TOutputESSL outputESSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(),
&getSymbolTable(), getShaderType(), shaderVer, precisionEmulation,
compileOptions);
root->traverse(&outputESSL);
}
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);
}
void TranslatorHLSL::translate(TIntermNode *root, int compileOptions)
{
const ShBuiltInResources &resources = getResources();
int numRenderTargets = resources.EXT_draw_buffers ? resources.MaxDrawBuffers : 1;
sh::AddDefaultReturnStatements(root);
SeparateDeclarations(root);
// TODO (oetuaho): Sequence operators should also be split in case there is dynamic indexing of
// a vector or matrix as an l-value inside (RemoveDynamicIndexing transformation step generates
// statements in this case).
SplitSequenceOperator(root,
IntermNodePatternMatcher::kExpressionReturningArray |
IntermNodePatternMatcher::kUnfoldedShortCircuitExpression |
IntermNodePatternMatcher::kDynamicIndexingOfVectorOrMatrixInLValue,
getTemporaryIndex(), getSymbolTable(), getShaderVersion());
// Note that SeparateDeclarations needs to be run before UnfoldShortCircuitToIf.
UnfoldShortCircuitToIf(root, getTemporaryIndex());
SeparateExpressionsReturningArrays(root, getTemporaryIndex());
// Note that SeparateDeclarations needs to be run before SeparateArrayInitialization.
SeparateArrayInitialization(root);
// HLSL doesn't support arrays as return values, we'll need to make functions that have an array
// as a return value to use an out parameter to transfer the array data instead.
ArrayReturnValueToOutParameter(root, getTemporaryIndex());
if (!shouldRunLoopAndIndexingValidation(compileOptions))
{
// HLSL doesn't support dynamic indexing of vectors and matrices.
RemoveDynamicIndexing(root, getTemporaryIndex(), getSymbolTable(), getShaderVersion());
}
// Work around D3D9 bug that would manifest in vertex shaders with selection blocks which
// use a vertex attribute as a condition, and some related computation in the else block.
if (getOutputType() == SH_HLSL_3_0_OUTPUT && getShaderType() == GL_VERTEX_SHADER)
{
sh::RewriteElseBlocks(root, getTemporaryIndex());
}
bool precisionEmulation =
getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
if (precisionEmulation)
{
EmulatePrecision emulatePrecision(getSymbolTable(), getShaderVersion());
root->traverse(&emulatePrecision);
emulatePrecision.updateTree();
emulatePrecision.writeEmulationHelpers(getInfoSink().obj, getShaderVersion(),
getOutputType());
}
if ((compileOptions & SH_EXPAND_SELECT_HLSL_INTEGER_POW_EXPRESSIONS) != 0)
{
sh::ExpandIntegerPowExpressions(root, getTemporaryIndex());
}
sh::OutputHLSL outputHLSL(getShaderType(), getShaderVersion(), getExtensionBehavior(),
getSourcePath(), getOutputType(), numRenderTargets, getUniforms(), compileOptions);
outputHLSL.output(root, getInfoSink().obj);
mInterfaceBlockRegisterMap = outputHLSL.getInterfaceBlockRegisterMap();
mUniformRegisterMap = outputHLSL.getUniformRegisterMap();
}
void TranslatorGLSL::translate(TIntermNode* root) {
TInfoSinkBase& sink = getInfoSink().obj;
// Write GLSL version.
writeVersion(getShaderType(), root, sink);
// Write extension behaviour as needed
writeExtensionBehavior();
// Write emulated built-in functions if needed.
getBuiltInFunctionEmulator().OutputEmulatedFunctionDefinition(
sink, false);
// Write array bounds clamping emulation if needed.
getArrayBoundsClamper().OutputClampingFunctionDefinition(sink);
// Write translated shader.
TOutputGLSL outputGLSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(), getSymbolTable(), getShaderVersion());
root->traverse(&outputGLSL);
}
void TranslatorGLSL::writeExtensionBehavior(TIntermNode *root, ShCompileOptions compileOptions)
{
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 == TExtension::EXT_shader_texture_lod)
{
sink << "#extension GL_ARB_shader_texture_lod : " << GetBehaviorString(iter.second)
<< "\n";
}
if (iter.first == TExtension::EXT_draw_buffers)
{
sink << "#extension GL_ARB_draw_buffers : " << GetBehaviorString(iter.second)
<< "\n";
}
if (iter.first == TExtension::EXT_geometry_shader)
{
sink << "#extension GL_ARB_geometry_shader4 : " << GetBehaviorString(iter.second)
<< "\n";
}
}
const bool isMultiview = (iter.first == TExtension::OVR_multiview);
if (isMultiview && getShaderType() == GL_VERTEX_SHADER &&
(compileOptions & SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER) != 0u)
{
// Emit the NV_viewport_array2 extension in a vertex shader if the
// SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER option is set and the OVR_multiview(2)
// extension is requested.
sink << "#extension GL_NV_viewport_array2 : require\n";
}
}
// GLSL ES 3 explicit location qualifiers need to use an extension before GLSL 330
if (getShaderVersion() >= 300 && getOutputType() < SH_GLSL_330_CORE_OUTPUT &&
getShaderType() != GL_COMPUTE_SHADER)
{
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 &&
getShaderVersion() == 100)
{
// Don't use "require" on to avoid breaking WebGL 1 on drivers that silently
// support index constant sampler array indexing, but don't have the extension or
// on drivers that don't have the extension at all as it would break WebGL 1 for
// some users.
sink << "#extension GL_ARB_gpu_shader5 : 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 TranslatorESSL::translate(TIntermNode *root, int) {
TInfoSinkBase& sink = getInfoSink().obj;
writePragma();
// Write built-in extension behaviors.
writeExtensionBehavior();
bool precisionEmulation = getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
if (precisionEmulation)
{
EmulatePrecision emulatePrecision;
root->traverse(&emulatePrecision);
emulatePrecision.updateTree();
emulatePrecision.writeEmulationHelpers(sink, SH_ESSL_OUTPUT);
}
// Write emulated built-in functions if needed.
getBuiltInFunctionEmulator().OutputEmulatedFunctionDefinition(
sink, getShaderType() == GL_FRAGMENT_SHADER);
// Write array bounds clamping emulation if needed.
getArrayBoundsClamper().OutputClampingFunctionDefinition(sink);
// Write translated shader.
TOutputESSL outputESSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(), getSymbolTable(), getShaderVersion(), precisionEmulation);
root->traverse(&outputESSL);
}