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-rw-r--r--src/3rdparty/angle/src/compiler/BuiltInFunctionEmulator.cpp406
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diff --git a/src/3rdparty/angle/src/compiler/BuiltInFunctionEmulator.cpp b/src/3rdparty/angle/src/compiler/BuiltInFunctionEmulator.cpp
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+++ b/src/3rdparty/angle/src/compiler/BuiltInFunctionEmulator.cpp
@@ -0,0 +1,406 @@
+//
+// Copyright (c) 2002-2011 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 "compiler/BuiltInFunctionEmulator.h"
+
+#include "compiler/SymbolTable.h"
+
+namespace {
+
+// we use macros here instead of function definitions to work around more GLSL
+// compiler bugs, in particular on NVIDIA hardware on Mac OSX. Macros are
+// problematic because if the argument has side-effects they will be repeatedly
+// evaluated. This is unlikely to show up in real shaders, but is something to
+// consider.
+const char* kFunctionEmulationVertexSource[] = {
+ "#error no emulation for cos(float)",
+ "#error no emulation for cos(vec2)",
+ "#error no emulation for cos(vec3)",
+ "#error no emulation for cos(vec4)",
+
+ "#define webgl_distance_emu(x, y) ((x) >= (y) ? (x) - (y) : (y) - (x))",
+ "#error no emulation for distance(vec2, vec2)",
+ "#error no emulation for distance(vec3, vec3)",
+ "#error no emulation for distance(vec4, vec4)",
+
+ "#define webgl_dot_emu(x, y) ((x) * (y))",
+ "#error no emulation for dot(vec2, vec2)",
+ "#error no emulation for dot(vec3, vec3)",
+ "#error no emulation for dot(vec4, vec4)",
+
+ "#define webgl_length_emu(x) ((x) >= 0.0 ? (x) : -(x))",
+ "#error no emulation for length(vec2)",
+ "#error no emulation for length(vec3)",
+ "#error no emulation for length(vec4)",
+
+ "#define webgl_normalize_emu(x) ((x) == 0.0 ? 0.0 : ((x) > 0.0 ? 1.0 : -1.0))",
+ "#error no emulation for normalize(vec2)",
+ "#error no emulation for normalize(vec3)",
+ "#error no emulation for normalize(vec4)",
+
+ "#define webgl_reflect_emu(I, N) ((I) - 2.0 * (N) * (I) * (N))",
+ "#error no emulation for reflect(vec2, vec2)",
+ "#error no emulation for reflect(vec3, vec3)",
+ "#error no emulation for reflect(vec4, vec4)"
+};
+
+const char* kFunctionEmulationFragmentSource[] = {
+ "webgl_emu_precision float webgl_cos_emu(webgl_emu_precision float a) { return cos(a); }",
+ "webgl_emu_precision vec2 webgl_cos_emu(webgl_emu_precision vec2 a) { return cos(a); }",
+ "webgl_emu_precision vec3 webgl_cos_emu(webgl_emu_precision vec3 a) { return cos(a); }",
+ "webgl_emu_precision vec4 webgl_cos_emu(webgl_emu_precision vec4 a) { return cos(a); }",
+
+ "#define webgl_distance_emu(x, y) ((x) >= (y) ? (x) - (y) : (y) - (x))",
+ "#error no emulation for distance(vec2, vec2)",
+ "#error no emulation for distance(vec3, vec3)",
+ "#error no emulation for distance(vec4, vec4)",
+
+ "#define webgl_dot_emu(x, y) ((x) * (y))",
+ "#error no emulation for dot(vec2, vec2)",
+ "#error no emulation for dot(vec3, vec3)",
+ "#error no emulation for dot(vec4, vec4)",
+
+ "#define webgl_length_emu(x) ((x) >= 0.0 ? (x) : -(x))",
+ "#error no emulation for length(vec2)",
+ "#error no emulation for length(vec3)",
+ "#error no emulation for length(vec4)",
+
+ "#define webgl_normalize_emu(x) ((x) == 0.0 ? 0.0 : ((x) > 0.0 ? 1.0 : -1.0))",
+ "#error no emulation for normalize(vec2)",
+ "#error no emulation for normalize(vec3)",
+ "#error no emulation for normalize(vec4)",
+
+ "#define webgl_reflect_emu(I, N) ((I) - 2.0 * (N) * (I) * (N))",
+ "#error no emulation for reflect(vec2, vec2)",
+ "#error no emulation for reflect(vec3, vec3)",
+ "#error no emulation for reflect(vec4, vec4)"
+};
+
+const bool kFunctionEmulationVertexMask[] = {
+#if defined(__APPLE__)
+ // Work around ATI driver bugs in Mac.
+ false, // TFunctionCos1
+ false, // TFunctionCos2
+ false, // TFunctionCos3
+ false, // TFunctionCos4
+ true, // TFunctionDistance1_1
+ false, // TFunctionDistance2_2
+ false, // TFunctionDistance3_3
+ false, // TFunctionDistance4_4
+ true, // TFunctionDot1_1
+ false, // TFunctionDot2_2
+ false, // TFunctionDot3_3
+ false, // TFunctionDot4_4
+ true, // TFunctionLength1
+ false, // TFunctionLength2
+ false, // TFunctionLength3
+ false, // TFunctionLength4
+ true, // TFunctionNormalize1
+ false, // TFunctionNormalize2
+ false, // TFunctionNormalize3
+ false, // TFunctionNormalize4
+ true, // TFunctionReflect1_1
+ false, // TFunctionReflect2_2
+ false, // TFunctionReflect3_3
+ false, // TFunctionReflect4_4
+#else
+ // Work around D3D driver bug in Win.
+ false, // TFunctionCos1
+ false, // TFunctionCos2
+ false, // TFunctionCos3
+ false, // TFunctionCos4
+ false, // TFunctionDistance1_1
+ false, // TFunctionDistance2_2
+ false, // TFunctionDistance3_3
+ false, // TFunctionDistance4_4
+ false, // TFunctionDot1_1
+ false, // TFunctionDot2_2
+ false, // TFunctionDot3_3
+ false, // TFunctionDot4_4
+ false, // TFunctionLength1
+ false, // TFunctionLength2
+ false, // TFunctionLength3
+ false, // TFunctionLength4
+ false, // TFunctionNormalize1
+ false, // TFunctionNormalize2
+ false, // TFunctionNormalize3
+ false, // TFunctionNormalize4
+ false, // TFunctionReflect1_1
+ false, // TFunctionReflect2_2
+ false, // TFunctionReflect3_3
+ false, // TFunctionReflect4_4
+#endif
+ false // TFunctionUnknown
+};
+
+const bool kFunctionEmulationFragmentMask[] = {
+#if defined(__APPLE__)
+ // Work around ATI driver bugs in Mac.
+ true, // TFunctionCos1
+ true, // TFunctionCos2
+ true, // TFunctionCos3
+ true, // TFunctionCos4
+ true, // TFunctionDistance1_1
+ false, // TFunctionDistance2_2
+ false, // TFunctionDistance3_3
+ false, // TFunctionDistance4_4
+ true, // TFunctionDot1_1
+ false, // TFunctionDot2_2
+ false, // TFunctionDot3_3
+ false, // TFunctionDot4_4
+ true, // TFunctionLength1
+ false, // TFunctionLength2
+ false, // TFunctionLength3
+ false, // TFunctionLength4
+ true, // TFunctionNormalize1
+ false, // TFunctionNormalize2
+ false, // TFunctionNormalize3
+ false, // TFunctionNormalize4
+ true, // TFunctionReflect1_1
+ false, // TFunctionReflect2_2
+ false, // TFunctionReflect3_3
+ false, // TFunctionReflect4_4
+#else
+ // Work around D3D driver bug in Win.
+ false, // TFunctionCos1
+ false, // TFunctionCos2
+ false, // TFunctionCos3
+ false, // TFunctionCos4
+ false, // TFunctionDistance1_1
+ false, // TFunctionDistance2_2
+ false, // TFunctionDistance3_3
+ false, // TFunctionDistance4_4
+ false, // TFunctionDot1_1
+ false, // TFunctionDot2_2
+ false, // TFunctionDot3_3
+ false, // TFunctionDot4_4
+ false, // TFunctionLength1
+ false, // TFunctionLength2
+ false, // TFunctionLength3
+ false, // TFunctionLength4
+ false, // TFunctionNormalize1
+ false, // TFunctionNormalize2
+ false, // TFunctionNormalize3
+ false, // TFunctionNormalize4
+ false, // TFunctionReflect1_1
+ false, // TFunctionReflect2_2
+ false, // TFunctionReflect3_3
+ false, // TFunctionReflect4_4
+#endif
+ false // TFunctionUnknown
+};
+
+class BuiltInFunctionEmulationMarker : public TIntermTraverser {
+public:
+ BuiltInFunctionEmulationMarker(BuiltInFunctionEmulator& emulator)
+ : mEmulator(emulator)
+ {
+ }
+
+ virtual bool visitUnary(Visit visit, TIntermUnary* node)
+ {
+ if (visit == PreVisit) {
+ bool needToEmulate = mEmulator.SetFunctionCalled(
+ node->getOp(), node->getOperand()->getType());
+ if (needToEmulate)
+ node->setUseEmulatedFunction();
+ }
+ return true;
+ }
+
+ virtual bool visitAggregate(Visit visit, TIntermAggregate* node)
+ {
+ if (visit == PreVisit) {
+ // Here we handle all the built-in functions instead of the ones we
+ // currently identified as problematic.
+ switch (node->getOp()) {
+ case EOpLessThan:
+ case EOpGreaterThan:
+ case EOpLessThanEqual:
+ case EOpGreaterThanEqual:
+ case EOpVectorEqual:
+ case EOpVectorNotEqual:
+ case EOpMod:
+ case EOpPow:
+ case EOpAtan:
+ case EOpMin:
+ case EOpMax:
+ case EOpClamp:
+ case EOpMix:
+ case EOpStep:
+ case EOpSmoothStep:
+ case EOpDistance:
+ case EOpDot:
+ case EOpCross:
+ case EOpFaceForward:
+ case EOpReflect:
+ case EOpRefract:
+ case EOpMul:
+ break;
+ default:
+ return true;
+ };
+ const TIntermSequence& sequence = node->getSequence();
+ // Right now we only handle built-in functions with two parameters.
+ if (sequence.size() != 2)
+ return true;
+ TIntermTyped* param1 = sequence[0]->getAsTyped();
+ TIntermTyped* param2 = sequence[1]->getAsTyped();
+ if (!param1 || !param2)
+ return true;
+ bool needToEmulate = mEmulator.SetFunctionCalled(
+ node->getOp(), param1->getType(), param2->getType());
+ if (needToEmulate)
+ node->setUseEmulatedFunction();
+ }
+ return true;
+ }
+
+private:
+ BuiltInFunctionEmulator& mEmulator;
+};
+
+} // anonymous namepsace
+
+BuiltInFunctionEmulator::BuiltInFunctionEmulator(ShShaderType shaderType)
+{
+ if (shaderType == SH_FRAGMENT_SHADER) {
+ mFunctionMask = kFunctionEmulationFragmentMask;
+ mFunctionSource = kFunctionEmulationFragmentSource;
+ } else {
+ mFunctionMask = kFunctionEmulationVertexMask;
+ mFunctionSource = kFunctionEmulationVertexSource;
+ }
+}
+
+bool BuiltInFunctionEmulator::SetFunctionCalled(
+ TOperator op, const TType& param)
+{
+ TBuiltInFunction function = IdentifyFunction(op, param);
+ return SetFunctionCalled(function);
+}
+
+bool BuiltInFunctionEmulator::SetFunctionCalled(
+ TOperator op, const TType& param1, const TType& param2)
+{
+ TBuiltInFunction function = IdentifyFunction(op, param1, param2);
+ return SetFunctionCalled(function);
+}
+
+bool BuiltInFunctionEmulator::SetFunctionCalled(
+ BuiltInFunctionEmulator::TBuiltInFunction function) {
+ if (function == TFunctionUnknown || mFunctionMask[function] == false)
+ return false;
+ for (size_t i = 0; i < mFunctions.size(); ++i) {
+ if (mFunctions[i] == function)
+ return true;
+ }
+ mFunctions.push_back(function);
+ return true;
+}
+
+void BuiltInFunctionEmulator::OutputEmulatedFunctionDefinition(
+ TInfoSinkBase& out, bool withPrecision) const
+{
+ if (mFunctions.size() == 0)
+ return;
+ out << "// BEGIN: Generated code for built-in function emulation\n\n";
+ if (withPrecision) {
+ out << "#if defined(GL_FRAGMENT_PRECISION_HIGH)\n"
+ << "#define webgl_emu_precision highp\n"
+ << "#else\n"
+ << "#define webgl_emu_precision mediump\n"
+ << "#endif\n\n";
+ } else {
+ out << "#define webgl_emu_precision\n\n";
+ }
+ for (size_t i = 0; i < mFunctions.size(); ++i) {
+ out << mFunctionSource[mFunctions[i]] << "\n\n";
+ }
+ out << "// END: Generated code for built-in function emulation\n\n";
+}
+
+BuiltInFunctionEmulator::TBuiltInFunction
+BuiltInFunctionEmulator::IdentifyFunction(
+ TOperator op, const TType& param)
+{
+ if (param.getNominalSize() > 4)
+ return TFunctionUnknown;
+ unsigned int function = TFunctionUnknown;
+ switch (op) {
+ case EOpCos:
+ function = TFunctionCos1;
+ break;
+ case EOpLength:
+ function = TFunctionLength1;
+ break;
+ case EOpNormalize:
+ function = TFunctionNormalize1;
+ break;
+ default:
+ break;
+ }
+ if (function == TFunctionUnknown)
+ return TFunctionUnknown;
+ if (param.isVector())
+ function += param.getNominalSize() - 1;
+ return static_cast<TBuiltInFunction>(function);
+}
+
+BuiltInFunctionEmulator::TBuiltInFunction
+BuiltInFunctionEmulator::IdentifyFunction(
+ TOperator op, const TType& param1, const TType& param2)
+{
+ // Right now for all the emulated functions with two parameters, the two
+ // parameters have the same type.
+ if (param1.isVector() != param2.isVector() ||
+ param1.getNominalSize() != param2.getNominalSize() ||
+ param1.getNominalSize() > 4)
+ return TFunctionUnknown;
+
+ unsigned int function = TFunctionUnknown;
+ switch (op) {
+ case EOpDistance:
+ function = TFunctionDistance1_1;
+ break;
+ case EOpDot:
+ function = TFunctionDot1_1;
+ break;
+ case EOpReflect:
+ function = TFunctionReflect1_1;
+ break;
+ default:
+ break;
+ }
+ if (function == TFunctionUnknown)
+ return TFunctionUnknown;
+ if (param1.isVector())
+ function += param1.getNominalSize() - 1;
+ return static_cast<TBuiltInFunction>(function);
+}
+
+void BuiltInFunctionEmulator::MarkBuiltInFunctionsForEmulation(
+ TIntermNode* root)
+{
+ ASSERT(root);
+
+ BuiltInFunctionEmulationMarker marker(*this);
+ root->traverse(&marker);
+}
+
+void BuiltInFunctionEmulator::Cleanup()
+{
+ mFunctions.clear();
+}
+
+//static
+TString BuiltInFunctionEmulator::GetEmulatedFunctionName(
+ const TString& name)
+{
+ ASSERT(name[name.length() - 1] == '(');
+ return "webgl_" + name.substr(0, name.length() - 1) + "_emu(";
+}
+