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//
// 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/TranslatorESSL.h"
#include "compiler/translator/BuiltInFunctionEmulatorGLSL.h"
#include "compiler/translator/EmulatePrecision.h"
#include "compiler/translator/RecordConstantPrecision.h"
#include "compiler/translator/OutputESSL.h"
#include "angle_gl.h"
namespace sh
{
TranslatorESSL::TranslatorESSL(sh::GLenum type, ShShaderSpec spec)
: TCompiler(type, spec, SH_ESSL_OUTPUT)
{
}
void TranslatorESSL::initBuiltInFunctionEmulator(BuiltInFunctionEmulator *emu,
ShCompileOptions compileOptions)
{
if (compileOptions & SH_EMULATE_ATAN2_FLOAT_FUNCTION)
{
InitBuiltInAtanFunctionEmulatorForGLSLWorkarounds(emu);
}
}
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(), shaderVer);
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_OES)
{
WriteGeometryShaderLayoutQualifiers(
sink, getGeometryShaderInputPrimitiveType(), getGeometryShaderInvocations(),
getGeometryShaderOutputPrimitiveType(), getGeometryShaderMaxVertices());
}
// Write translated shader.
TOutputESSL outputESSL(sink, getArrayIndexClampingStrategy(), getHashFunction(), getNameMap(),
&getSymbolTable(), getShaderType(), shaderVer, precisionEmulation,
compileOptions);
if (compileOptions & SH_TRANSLATE_VIEWID_OVR_TO_UNIFORM)
{
TName uniformName(TString("ViewID_OVR"));
uniformName.setInternal(true);
sink << "highp uniform int " << outputESSL.hashName(uniformName) << ";\n";
}
root->traverse(&outputESSL);
}
bool TranslatorESSL::shouldFlattenPragmaStdglInvariantAll()
{
// Not necessary when translating to ESSL.
return false;
}
void TranslatorESSL::writeExtensionBehavior(ShCompileOptions compileOptions)
{
TInfoSinkBase &sink = getInfoSink().obj;
const TExtensionBehavior &extBehavior = getExtensionBehavior();
const bool isMultiviewExtEmulated =
(compileOptions &
(SH_TRANSLATE_VIEWID_OVR_TO_UNIFORM | SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW |
SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER)) != 0u;
for (TExtensionBehavior::const_iterator iter = extBehavior.begin(); iter != extBehavior.end();
++iter)
{
if (iter->second != EBhUndefined)
{
const bool isMultiview = (iter->first == TExtension::OVR_multiview);
if (getResources().NV_shader_framebuffer_fetch &&
iter->first == TExtension::EXT_shader_framebuffer_fetch)
{
sink << "#extension GL_NV_shader_framebuffer_fetch : "
<< GetBehaviorString(iter->second) << "\n";
}
else if (getResources().NV_draw_buffers && iter->first == TExtension::EXT_draw_buffers)
{
sink << "#extension GL_NV_draw_buffers : " << GetBehaviorString(iter->second)
<< "\n";
}
else if (isMultiview && isMultiviewExtEmulated)
{
if (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";
}
}
else if (iter->first == TExtension::OES_geometry_shader)
{
sink << "#ifdef GL_OES_geometry_shader\n"
<< "#extension GL_OES_geometry_shader : " << GetBehaviorString(iter->second)
<< "\n"
<< "#elif defined GL_EXT_geometry_shader\n"
<< "#extension GL_EXT_geometry_shader : " << GetBehaviorString(iter->second)
<< "\n";
if (iter->second == EBhRequire)
{
sink << "#else\n"
<< "#error \"No geometry shader extensions available.\" // Only generate "
"this if the extension is \"required\"\n";
}
sink << "#endif\n";
}
else
{
sink << "#extension " << GetExtensionNameString(iter->first) << " : "
<< GetBehaviorString(iter->second) << "\n";
}
}
}
}
} // namespace sh
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