void TOutputGLSL::visitSymbol(TIntermSymbol *node)
{
TInfoSinkBase& out = objSink();
const TString &symbol = node->getSymbol();
if (symbol == "gl_FragDepthEXT")
{
out << "gl_FragDepth";
}
else if (symbol == "gl_FragColor" && IsGLSL130OrNewer(getShaderOutput()))
{
out << "webgl_FragColor";
}
else if (symbol == "gl_FragData" && IsGLSL130OrNewer(getShaderOutput()))
{
out << "webgl_FragData";
}
else if (symbol == "gl_SecondaryFragColorEXT")
{
out << "angle_SecondaryFragColor";
}
else if (symbol == "gl_SecondaryFragDataEXT")
{
out << "angle_SecondaryFragData";
}
else
{
TOutputGLSLBase::visitSymbol(node);
}
}
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 TOutputGLSLBase::writeVariableType(const TType &type)
{
TInfoSinkBase &out = objSink();
if (type.isInvariant())
{
out << "invariant ";
}
TQualifier qualifier = type.getQualifier();
if (qualifier != EvqTemporary && qualifier != EvqGlobal)
{
if (IsGLSL130OrNewer(mOutput))
{
switch (qualifier)
{
case EvqAttribute:
out << "in ";
break;
case EvqVaryingIn:
out << "in ";
break;
case EvqVaryingOut:
out << "out ";
break;
default:
out << type.getQualifierString() << " ";
break;
}
}
else
{
out << type.getQualifierString() << " ";
}
}
// Declare the struct if we have not done so already.
if (type.getBasicType() == EbtStruct && !structDeclared(type.getStruct()))
{
TStructure *structure = type.getStruct();
declareStruct(structure);
if (!structure->name().empty())
{
mDeclaredStructs.insert(structure->uniqueId());
}
}
else
{
if (writeVariablePrecision(type.getPrecision()))
out << " ";
out << getTypeName(type);
}
}
TString TOutputGLSL::translateTextureFunction(TString &name)
{
static const char *simpleRename[] = {
"texture2DLodEXT", "texture2DLod",
"texture2DProjLodEXT", "texture2DProjLod",
"textureCubeLodEXT", "textureCubeLod",
"texture2DGradEXT", "texture2DGradARB",
"texture2DProjGradEXT", "texture2DProjGradARB",
"textureCubeGradEXT", "textureCubeGradARB",
NULL, NULL
};
static const char *legacyToCoreRename[] = {
"texture2D", "texture",
"texture2DProj", "textureProj",
"texture2DLod", "textureLod",
"texture2DProjLod", "textureProjLod",
"texture2DRect", "texture",
"textureCube", "texture",
"textureCubeLod", "textureLod",
// Extensions
"texture2DLodEXT", "textureLod",
"texture2DProjLodEXT", "textureProjLod",
"textureCubeLodEXT", "textureLod",
"texture2DGradEXT", "textureGrad",
"texture2DProjGradEXT", "textureProjGrad",
"textureCubeGradEXT", "textureGrad",
NULL, NULL
};
const char **mapping = (IsGLSL130OrNewer(getShaderOutput())) ?
legacyToCoreRename : simpleRename;
for (int i = 0; mapping[i] != NULL; i += 2)
{
if (name == mapping[i])
{
return mapping[i+1];
}
}
return name;
}
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 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());
}
