chromium/third_party/angle/src/compiler/translator/tree_ops/EmulateMultiDrawShaderBuiltins.cpp

//
// Copyright 2019 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.
//
// EmulateGLDrawID is an AST traverser to convert the gl_DrawID builtin
// to a uniform int
//
// EmulateGLBaseVertex is an AST traverser to convert the gl_BaseVertex builtin
// to a uniform int
//
// EmulateGLBaseInstance is an AST traverser to convert the gl_BaseInstance builtin
// to a uniform int
//

#include "compiler/translator/tree_ops/EmulateMultiDrawShaderBuiltins.h"

#include "angle_gl.h"
#include "compiler/translator/StaticType.h"
#include "compiler/translator/Symbol.h"
#include "compiler/translator/SymbolTable.h"
#include "compiler/translator/tree_util/BuiltIn.h"
#include "compiler/translator/tree_util/IntermTraverse.h"
#include "compiler/translator/tree_util/ReplaceVariable.h"
#include "compiler/translator/util.h"

namespace sh
{

namespace
{

constexpr const ImmutableString kEmulatedGLDrawIDName("angle_DrawID");

class FindGLDrawIDTraverser : public TIntermTraverser
{ … };

class AddBaseVertexToGLVertexIDTraverser : public TIntermTraverser
{ … };

constexpr const ImmutableString kEmulatedGLBaseVertexName("angle_BaseVertex");

class FindGLBaseVertexTraverser : public TIntermTraverser
{ … };

constexpr const ImmutableString kEmulatedGLBaseInstanceName("angle_BaseInstance");

class FindGLBaseInstanceTraverser : public TIntermTraverser
{ … };

}  // namespace

bool EmulateGLDrawID(TCompiler *compiler,
                     TIntermBlock *root,
                     TSymbolTable *symbolTable,
                     std::vector<sh::ShaderVariable> *uniforms)
{ … }

bool EmulateGLBaseVertexBaseInstance(TCompiler *compiler,
                                     TIntermBlock *root,
                                     TSymbolTable *symbolTable,
                                     std::vector<sh::ShaderVariable> *uniforms,
                                     bool addBaseVertexToVertexID)
{ … }

}  // namespace sh