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//
// 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 "angle_gl.h"
#include "compiler/translator/BuiltInFunctionEmulator.h"
#include "compiler/translator/BuiltInFunctionEmulatorGLSL.h"
#include "compiler/translator/SymbolTable.h"
void InitBuiltInFunctionEmulatorForGLSL(BuiltInFunctionEmulator *emu, sh::GLenum shaderType)
{
// 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.
TType float1(EbtFloat);
TType float2(EbtFloat, 2);
TType float3(EbtFloat, 3);
TType float4(EbtFloat, 4);
if (shaderType == GL_FRAGMENT_SHADER)
{
emu->addEmulatedFunction(EOpCos, float1, "webgl_emu_precision float webgl_cos_emu(webgl_emu_precision float a) { return cos(a); }");
emu->addEmulatedFunction(EOpCos, float2, "webgl_emu_precision vec2 webgl_cos_emu(webgl_emu_precision vec2 a) { return cos(a); }");
emu->addEmulatedFunction(EOpCos, float3, "webgl_emu_precision vec3 webgl_cos_emu(webgl_emu_precision vec3 a) { return cos(a); }");
emu->addEmulatedFunction(EOpCos, float4, "webgl_emu_precision vec4 webgl_cos_emu(webgl_emu_precision vec4 a) { return cos(a); }");
}
emu->addEmulatedFunction(EOpDistance, float1, float1, "#define webgl_distance_emu(x, y) ((x) >= (y) ? (x) - (y) : (y) - (x))");
emu->addEmulatedFunction(EOpDot, float1, float1, "#define webgl_dot_emu(x, y) ((x) * (y))");
emu->addEmulatedFunction(EOpLength, float1, "#define webgl_length_emu(x) ((x) >= 0.0 ? (x) : -(x))");
emu->addEmulatedFunction(EOpNormalize, float1, "#define webgl_normalize_emu(x) ((x) == 0.0 ? 0.0 : ((x) > 0.0 ? 1.0 : -1.0))");
emu->addEmulatedFunction(EOpReflect, float1, float1, "#define webgl_reflect_emu(I, N) ((I) - 2.0 * (N) * (I) * (N))");
}
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