RewriteInterpolateAtOffset.h

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//

// Copyright 2020 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.

//

// This mutating tree traversal flips the 2nd argument of interpolateAtOffset() to account for

// Y-coordinate flipping

//

// From: interpolateAtOffset(float interpolant, vec2 offset);

// To: interpolateAtOffset(float interpolant, vec2(offset * (pre-rotation * viewportYScale)));

//

// See http://anglebug.com/42262252

#ifndef COMPILER_TRANSLATOR_TREEOPS_SPIRV_REWRITEINTERPOLATEATOFFSET_H_

#define COMPILER_TRANSLATOR_TREEOPS_SPIRV_REWRITEINTERPOLATEATOFFSET_H_

#include "common/angleutils.h"

#include "compiler/translator/Compiler.h"

namespace sh

class TCompiler;

class TIntermBlock;

class TSymbolTable;

class DriverUniform;

// If fragRotation = nullptr, no rotation will be applied.

[[nodiscard]] bool RewriteInterpolateAtOffset(TCompiler *compiler,

                                              TIntermBlock *root,

                                              TSymbolTable *symbolTable,

                                              int shaderVersion,

                                              const DriverUniform *driverUniforms);

}  // namespace sh

#endif  // COMPILER_TRANSLATOR_TREEOPS_SPIRV_REWRITEINTERPOLATEATOFFSET_H_