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

//
// Copyright 2017 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.
//
// Applies the necessary AST transformations to support multiview rendering through instancing.
// Check the header file For more information.
//

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

#include "compiler/translator/Compiler.h"
#include "compiler/translator/StaticType.h"
#include "compiler/translator/SymbolTable.h"
#include "compiler/translator/tree_ops/InitializeVariables.h"
#include "compiler/translator/tree_util/BuiltIn.h"
#include "compiler/translator/tree_util/FindMain.h"
#include "compiler/translator/tree_util/IntermNode_util.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 kViewIDVariableName("ViewID_OVR");
constexpr const ImmutableString kInstanceIDVariableName("InstanceID");
constexpr const ImmutableString kMultiviewBaseViewLayerIndexVariableName(
    "multiviewBaseViewLayerIndex");

// Adds the InstanceID and ViewID_OVR initializers to the end of the initializers' sequence.
void InitializeViewIDAndInstanceID(const TVariable *viewID,
                                   const TVariable *instanceID,
                                   unsigned numberOfViews,
                                   const TSymbolTable &symbolTable,
                                   TIntermSequence *initializers)
{ … }

// Write int(ViewID_OVR) to gl_Layer. The assignment is
// added to the end of the initializers' sequence.
void SelectViewIndexInVertexShader(const TVariable *viewID,
                                   const TVariable *multiviewBaseViewLayerIndex,
                                   TIntermSequence *initializers,
                                   const TSymbolTable &symbolTable)
{ … }

}  // namespace

bool DeclareAndInitBuiltinsForInstancedMultiview(TCompiler *compiler,
                                                 TIntermBlock *root,
                                                 unsigned numberOfViews,
                                                 GLenum shaderType,
                                                 const ShCompileOptions &compileOptions,
                                                 ShShaderOutput shaderOutput,
                                                 TSymbolTable *symbolTable)
{ … }

}  // namespace sh