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// Copyright (c) 2011 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 "GLSLANG/ShaderLang.h"
#include "compiler/InfoSink.h"
#include "compiler/intermediate.h"
// This class decides which built-in functions need to be replaced with the
// emulated ones.
// It's only a workaround for OpenGL driver bugs, and isn't needed in general.
class BuiltInFunctionEmulator {
BuiltInFunctionEmulator(ShShaderType shaderType);
// Records that a function is called by the shader and might needs to be
// emulated. If the function's group is not in mFunctionGroupFilter, this
// becomes an no-op.
// Returns true if the function call needs to be replaced with an emulated
// one.
bool SetFunctionCalled(TOperator op, const TType& param);
bool SetFunctionCalled(
TOperator op, const TType& param1, const TType& param2);
// Output function emulation definition. This should be before any other
// shader source.
void OutputEmulatedFunctionDefinition(TInfoSinkBase& out, bool withPrecision) const;
void MarkBuiltInFunctionsForEmulation(TIntermNode* root);
void Cleanup();
// "name(" becomes "webgl_name_emu(".
static TString GetEmulatedFunctionName(const TString& name);
// Built-in functions.
enum TBuiltInFunction {
TFunctionCos1 = 0, // float cos(float);
TFunctionCos2, // vec2 cos(vec2);
TFunctionCos3, // vec3 cos(vec3);
TFunctionCos4, // vec4 cos(vec4);
TFunctionDistance1_1, // float distance(float, float);
TFunctionDistance2_2, // vec2 distance(vec2, vec2);
TFunctionDistance3_3, // vec3 distance(vec3, vec3);
TFunctionDistance4_4, // vec4 distance(vec4, vec4);
TFunctionDot1_1, // float dot(float, float);
TFunctionDot2_2, // vec2 dot(vec2, vec2);
TFunctionDot3_3, // vec3 dot(vec3, vec3);
TFunctionDot4_4, // vec4 dot(vec4, vec4);
TFunctionLength1, // float length(float);
TFunctionLength2, // float length(vec2);
TFunctionLength3, // float length(vec3);
TFunctionLength4, // float length(vec4);
TFunctionNormalize1, // float normalize(float);
TFunctionNormalize2, // vec2 normalize(vec2);
TFunctionNormalize3, // vec3 normalize(vec3);
TFunctionNormalize4, // vec4 normalize(vec4);
TFunctionReflect1_1, // float reflect(float, float);
TFunctionReflect2_2, // vec2 reflect(vec2, vec2);
TFunctionReflect3_3, // vec3 reflect(vec3, vec3);
TFunctionReflect4_4, // vec4 reflect(vec4, vec4);
TBuiltInFunction IdentifyFunction(TOperator op, const TType& param);
TBuiltInFunction IdentifyFunction(
TOperator op, const TType& param1, const TType& param2);
bool SetFunctionCalled(TBuiltInFunction function);
std::vector<TBuiltInFunction> mFunctions;
const bool* mFunctionMask; // a boolean flag for each function.
const char** mFunctionSource;