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(TIntermBlock *root,
ShCompileOptions compileOptions,
PerformanceDiagnostics * /*perfDiagnostics*/)
{
TInfoSinkBase &sink = getInfoSink().obj;
// Write GLSL version.
writeVersion(root);
// Write extension behaviour as needed
writeExtensionBehavior(root, compileOptions);
// 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) != 0 &&
getPragma().stdgl.invariantAll &&
!sh::RemoveInvariant(getShaderType(), getShaderVersion(), getOutputType(), compileOptions))
{
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());
}
if ((compileOptions & SH_REWRITE_FLOAT_UNARY_MINUS_OPERATOR) != 0)
{
sh::RewriteUnaryMinusOperatorFloat(root);
}
bool precisionEmulation =
getResources().WEBGL_debug_shader_precision && getPragma().debugShaderPrecision;
if (precisionEmulation)
{
EmulatePrecision emulatePrecision(&getSymbolTable());
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 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(), TExtension::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";
}
if (getShaderType() == GL_GEOMETRY_SHADER_EXT)
{
WriteGeometryShaderLayoutQualifiers(
sink, getGeometryShaderInputPrimitiveType(), getGeometryShaderInvocations(),
getGeometryShaderOutputPrimitiveType(), getGeometryShaderMaxVertices());
}
// Write translated shader.
TOutputGLSL outputGLSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(),
&getSymbolTable(), getShaderType(), getShaderVersion(), getOutputType(),
compileOptions);
root->traverse(&outputGLSL);
}