1 : //
2 : // Copyright (c) 2011 The ANGLE Project Authors. All rights reserved.
3 : // Use of this source code is governed by a BSD-style license that can be
4 : // found in the LICENSE file.
5 : //
6 :
7 : #ifndef COMPILIER_BUILT_IN_FUNCTION_EMULATOR_H_
8 : #define COMPILIER_BUILT_IN_FUNCTION_EMULATOR_H_
9 :
10 : #include "GLSLANG/ShaderLang.h"
11 :
12 : #include "compiler/InfoSink.h"
13 : #include "compiler/intermediate.h"
14 :
15 : //
16 : // This class decides which built-in functions need to be replaced with the
17 : // emulated ones.
18 : // It's only a workaround for OpenGL driver bugs, and isn't needed in general.
19 : //
20 0 : class BuiltInFunctionEmulator {
21 : public:
22 : BuiltInFunctionEmulator(ShShaderType shaderType);
23 : // Records that a function is called by the shader and might needs to be
24 : // emulated. If the function's group is not in mFunctionGroupFilter, this
25 : // becomes an no-op.
26 : // Returns true if the function call needs to be replaced with an emulated
27 : // one.
28 : bool SetFunctionCalled(TOperator op, const TType& param);
29 : bool SetFunctionCalled(
30 : TOperator op, const TType& param1, const TType& param2);
31 :
32 : // Output function emulation definition. This should be before any other
33 : // shader source.
34 : void OutputEmulatedFunctionDefinition(TInfoSinkBase& out, bool withPrecision) const;
35 :
36 : void MarkBuiltInFunctionsForEmulation(TIntermNode* root);
37 :
38 : void Cleanup();
39 :
40 : // "name(" becomes "webgl_name_emu(".
41 : static TString GetEmulatedFunctionName(const TString& name);
42 :
43 : private:
44 : //
45 : // Built-in functions.
46 : //
47 : enum TBuiltInFunction {
48 : TFunctionAtan1_1 = 0, // float atan(float, float);
49 : TFunctionAtan2_2, // vec2 atan(vec2, vec2);
50 : TFunctionAtan3_3, // vec3 atan(vec3, vec2);
51 : TFunctionAtan4_4, // vec4 atan(vec4, vec2);
52 :
53 : TFunctionCos1, // float cos(float);
54 : TFunctionCos2, // vec2 cos(vec2);
55 : TFunctionCos3, // vec3 cos(vec3);
56 : TFunctionCos4, // vec4 cos(vec4);
57 :
58 : TFunctionDistance1_1, // float distance(float, float);
59 : TFunctionDistance2_2, // vec2 distance(vec2, vec2);
60 : TFunctionDistance3_3, // vec3 distance(vec3, vec3);
61 : TFunctionDistance4_4, // vec4 distance(vec4, vec4);
62 :
63 : TFunctionDot1_1, // float dot(float, float);
64 : TFunctionDot2_2, // vec2 dot(vec2, vec2);
65 : TFunctionDot3_3, // vec3 dot(vec3, vec3);
66 : TFunctionDot4_4, // vec4 dot(vec4, vec4);
67 :
68 : TFunctionLength1, // float length(float);
69 : TFunctionLength2, // float length(vec2);
70 : TFunctionLength3, // float length(vec3);
71 : TFunctionLength4, // float length(vec4);
72 :
73 : TFunctionMod1_1, // float mod(float, float);
74 : TFunctionMod2_2, // vec2 mod(vec2, vec2);
75 : TFunctionMod3_3, // vec3 mod(vec3, vec3);
76 : TFunctionMod4_4, // vec4 mod(vec4, vec4);
77 :
78 : TFunctionNormalize1, // float normalize(float);
79 : TFunctionNormalize2, // vec2 normalize(vec2);
80 : TFunctionNormalize3, // vec3 normalize(vec3);
81 : TFunctionNormalize4, // vec4 normalize(vec4);
82 :
83 : TFunctionReflect1_1, // float reflect(float, float);
84 : TFunctionReflect2_2, // vec2 reflect(vec2, vec2);
85 : TFunctionReflect3_3, // vec3 reflect(vec3, vec3);
86 : TFunctionReflect4_4, // vec4 reflect(vec4, vec4);
87 :
88 : TFunctionUnknown
89 : };
90 :
91 : TBuiltInFunction IdentifyFunction(TOperator op, const TType& param);
92 : TBuiltInFunction IdentifyFunction(
93 : TOperator op, const TType& param1, const TType& param2);
94 :
95 : bool SetFunctionCalled(TBuiltInFunction function);
96 :
97 : std::vector<TBuiltInFunction> mFunctions;
98 :
99 : const bool* mFunctionMask; // a boolean flag for each function.
100 : const char** mFunctionSource;
101 : };
102 :
103 : #endif // COMPILIER_BUILT_IN_FUNCTION_EMULATOR_H_
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