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//
// Copyright (c) 2016 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.
//
// TranslatorVulkan:
// A GLSL-based translator that outputs shaders that fit GL_KHR_vulkan_glsl.
// The shaders are then fed into glslang to spit out SPIR-V (libANGLE-side).
// See: https://www.khronos.org/registry/vulkan/specs/misc/GL_KHR_vulkan_glsl.txt
//
#include "compiler/translator/TranslatorVulkan.h"
#include "angle_gl.h"
#include "common/utilities.h"
#include "compiler/translator/OutputVulkanGLSL.h"
#include "compiler/translator/util.h"
namespace sh
{
class DeclareDefaultUniformsTraverser : public TIntermTraverser
{
public:
DeclareDefaultUniformsTraverser(TInfoSinkBase *sink,
ShHashFunction64 hashFunction,
NameMap *nameMap)
: TIntermTraverser(true, true, true),
mSink(sink),
mHashFunction(hashFunction),
mNameMap(nameMap),
mInDefaultUniform(false)
{
}
bool visitDeclaration(Visit visit, TIntermDeclaration *node) override
{
const TIntermSequence &sequence = *(node->getSequence());
// TODO(jmadill): Compound declarations.
ASSERT(sequence.size() == 1);
TIntermTyped *variable = sequence.front()->getAsTyped();
const TType &type = variable->getType();
bool isUniform = (type.getQualifier() == EvqUniform) && !IsOpaqueType(type.getBasicType());
if (visit == PreVisit)
{
if (isUniform)
{
(*mSink) << " " << GetTypeName(type, mHashFunction, mNameMap) << " ";
mInDefaultUniform = true;
}
}
else if (visit == InVisit)
{
mInDefaultUniform = isUniform;
}
else if (visit == PostVisit)
{
if (isUniform)
{
(*mSink) << ";\n";
// Remove the uniform declaration from the tree so it isn't parsed again.
TIntermSequence emptyReplacement;
mMultiReplacements.push_back(NodeReplaceWithMultipleEntry(
getParentNode()->getAsBlock(), node, emptyReplacement));
}
mInDefaultUniform = false;
}
return true;
}
void visitSymbol(TIntermSymbol *symbol) override
{
if (mInDefaultUniform)
{
const TName &name = symbol->getName();
ASSERT(name.getString().substr(0, 3) != "gl_");
(*mSink) << HashName(name, mHashFunction, mNameMap);
}
}
private:
TInfoSinkBase *mSink;
ShHashFunction64 mHashFunction;
NameMap *mNameMap;
bool mInDefaultUniform;
};
TranslatorVulkan::TranslatorVulkan(sh::GLenum type, ShShaderSpec spec)
: TCompiler(type, spec, SH_GLSL_450_CORE_OUTPUT)
{
}
void TranslatorVulkan::translate(TIntermBlock *root,
ShCompileOptions compileOptions,
PerformanceDiagnostics * /*perfDiagnostics*/)
{
TInfoSinkBase &sink = getInfoSink().obj;
sink << "#version 450 core\n";
// Write out default uniforms into a uniform block assigned to a specific set/binding.
int defaultUniformCount = 0;
for (const auto &uniform : getUniforms())
{
if (!uniform.isBuiltIn() && uniform.staticUse && !gl::IsOpaqueType(uniform.type))
{
++defaultUniformCount;
}
}
if (defaultUniformCount > 0)
{
sink << "\nlayout(@@ DEFAULT-UNIFORMS-SET-BINDING @@) uniform defaultUniforms\n{\n";
DeclareDefaultUniformsTraverser defaultTraverser(&sink, getHashFunction(), &getNameMap());
root->traverse(&defaultTraverser);
defaultTraverser.updateTree();
sink << "};\n";
}
// 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)
{
bool hasGLFragColor = false;
bool hasGLFragData = false;
for (const auto &outputVar : outputVariables)
{
if (outputVar.name == "gl_FragColor")
{
ASSERT(!hasGLFragColor);
hasGLFragColor = true;
continue;
}
else if (outputVar.name == "gl_FragData")
{
ASSERT(!hasGLFragData);
hasGLFragData = true;
continue;
}
}
ASSERT(!(hasGLFragColor && hasGLFragData));
if (hasGLFragColor)
{
sink << "layout(location = 0) out vec4 webgl_FragColor;\n";
}
if (hasGLFragData)
{
sink << "layout(location = 0) out vec4 webgl_FragData[gl_MaxDrawBuffers];\n";
}
}
// Write translated shader.
TOutputVulkanGLSL outputGLSL(sink, getArrayIndexClampingStrategy(), getHashFunction(),
getNameMap(), &getSymbolTable(), getShaderType(),
getShaderVersion(), getOutputType(), compileOptions);
root->traverse(&outputGLSL);
}
bool TranslatorVulkan::shouldFlattenPragmaStdglInvariantAll()
{
// Not necessary.
return false;
}
} // namespace sh
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