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kc3-lang/angle/src/compiler/translator/BuiltInFunctionEmulatorGLSL.cpp
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Author :
Olli Etuaho
Date : 2018-04-04 11:58:33
Hash : 5fec7ab2
Message : Identify functions by unique id in BuiltInFunctionEmulator Now that unique ids of all builtins are compile-time constants, we can use them to look up functions in BuiltInFunctionEmulator. This is simpler than using a custom struct with the name and parameters for identifying functions. This requires that we store a reference to a TFunction in those TIntermUnary nodes that were created based on a function. This decreases shader_translator binary size by about 6 KB on Windows. BUG=angleproject:2267 BUG=chromium:823856 TEST=angle_unittests Change-Id: Idd5a00c772c6f26dd36fdbbfbe161d22ab27c2fe Reviewed-on: https://chromium-review.googlesource.com/995372 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
- src/compiler/translator/BuiltInFunctionEmulatorGLSL.cpp
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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 "compiler/translator/BuiltInFunctionEmulatorGLSL.h" #include "angle_gl.h" #include "compiler/translator/BuiltInFunctionEmulator.h" #include "compiler/translator/VersionGLSL.h" #include "compiler/translator/tree_util/BuiltIn_autogen.h" namespace sh { void InitBuiltInAbsFunctionEmulatorForGLSLWorkarounds(BuiltInFunctionEmulator *emu, sh::GLenum shaderType) { if (shaderType == GL_VERTEX_SHADER) { emu->addEmulatedFunction(BuiltInId::abs_Int1, "int abs_emu(int x) { return x * sign(x); }"); } } void InitBuiltInIsnanFunctionEmulatorForGLSLWorkarounds(BuiltInFunctionEmulator *emu, int targetGLSLVersion) { // isnan() is supported since GLSL 1.3. if (targetGLSLVersion < GLSL_VERSION_130) return; // !(x > 0.0 || x < 0.0 || x == 0.0) will be optimized and always equal to false. emu->addEmulatedFunction( BuiltInId::isnan_Float1, "bool isnan_emu(float x) { return (x > 0.0 || x < 0.0) ? false : x != 0.0; }"); emu->addEmulatedFunction( BuiltInId::isnan_Float2, "bvec2 isnan_emu(vec2 x)\n" "{\n" " bvec2 isnan;\n" " for (int i = 0; i < 2; i++)\n" " {\n" " isnan[i] = (x[i] > 0.0 || x[i] < 0.0) ? false : x[i] != 0.0;\n" " }\n" " return isnan;\n" "}\n"); emu->addEmulatedFunction( BuiltInId::isnan_Float3, "bvec3 isnan_emu(vec3 x)\n" "{\n" " bvec3 isnan;\n" " for (int i = 0; i < 3; i++)\n" " {\n" " isnan[i] = (x[i] > 0.0 || x[i] < 0.0) ? false : x[i] != 0.0;\n" " }\n" " return isnan;\n" "}\n"); emu->addEmulatedFunction( BuiltInId::isnan_Float4, "bvec4 isnan_emu(vec4 x)\n" "{\n" " bvec4 isnan;\n" " for (int i = 0; i < 4; i++)\n" " {\n" " isnan[i] = (x[i] > 0.0 || x[i] < 0.0) ? false : x[i] != 0.0;\n" " }\n" " return isnan;\n" "}\n"); } void InitBuiltInAtanFunctionEmulatorForGLSLWorkarounds(BuiltInFunctionEmulator *emu) { emu->addEmulatedFunction(BuiltInId::atan_Float1_Float1, "emu_precision float atan_emu(emu_precision float y, emu_precision " "float x)\n" "{\n" " if (x > 0.0) return atan(y / x);\n" " else if (x < 0.0 && y >= 0.0) return atan(y / x) + 3.14159265;\n" " else if (x < 0.0 && y < 0.0) return atan(y / x) - 3.14159265;\n" " else return 1.57079632 * sign(y);\n" "}\n"); static const std::array<TSymbolUniqueId, 4> ids = { BuiltInId::atan_Float1_Float1, BuiltInId::atan_Float2_Float2, BuiltInId::atan_Float3_Float3, BuiltInId::atan_Float4_Float4, }; for (int dim = 2; dim <= 4; ++dim) { std::stringstream ss; ss << "emu_precision vec" << dim << " atan_emu(emu_precision vec" << dim << " y, emu_precision vec" << dim << " x)\n" << "{\n" " return vec" << dim << "("; for (int i = 0; i < dim; ++i) { ss << "atan_emu(y[" << i << "], x[" << i << "])"; if (i < dim - 1) { ss << ", "; } } ss << ");\n" "}\n"; emu->addEmulatedFunctionWithDependency(BuiltInId::atan_Float1_Float1, ids[dim - 1], ss.str().c_str()); } } // Emulate built-in functions missing from GLSL 1.30 and higher void InitBuiltInFunctionEmulatorForGLSLMissingFunctions(BuiltInFunctionEmulator *emu, sh::GLenum shaderType, int targetGLSLVersion) { // Emulate packUnorm2x16 and unpackUnorm2x16 (GLSL 4.10) if (targetGLSLVersion < GLSL_VERSION_410) { // clang-format off emu->addEmulatedFunction(BuiltInId::packUnorm2x16_Float2, "uint packUnorm2x16_emu(vec2 v)\n" "{\n" " int x = int(round(clamp(v.x, 0.0, 1.0) * 65535.0));\n" " int y = int(round(clamp(v.y, 0.0, 1.0) * 65535.0));\n" " return uint((y << 16) | (x & 0xFFFF));\n" "}\n"); emu->addEmulatedFunction(BuiltInId::unpackUnorm2x16_UInt1, "vec2 unpackUnorm2x16_emu(uint u)\n" "{\n" " float x = float(u & 0xFFFFu) / 65535.0;\n" " float y = float(u >> 16) / 65535.0;\n" " return vec2(x, y);\n" "}\n"); // clang-format on } // Emulate packSnorm2x16, packHalf2x16, unpackSnorm2x16, and unpackHalf2x16 (GLSL 4.20) // by using floatBitsToInt, floatBitsToUint, intBitsToFloat, and uintBitsToFloat (GLSL 3.30). if (targetGLSLVersion >= GLSL_VERSION_330 && targetGLSLVersion < GLSL_VERSION_420) { // clang-format off emu->addEmulatedFunction(BuiltInId::packSnorm2x16_Float2, "uint packSnorm2x16_emu(vec2 v)\n" "{\n" " #if defined(GL_ARB_shading_language_packing)\n" " return packSnorm2x16(v);\n" " #else\n" " int x = int(round(clamp(v.x, -1.0, 1.0) * 32767.0));\n" " int y = int(round(clamp(v.y, -1.0, 1.0) * 32767.0));\n" " return uint((y << 16) | (x & 0xFFFF));\n" " #endif\n" "}\n"); emu->addEmulatedFunction(BuiltInId::unpackSnorm2x16_UInt1, "#if !defined(GL_ARB_shading_language_packing)\n" " float fromSnorm(uint x)\n" " {\n" " int xi = (int(x) & 0x7FFF) - (int(x) & 0x8000);\n" " return clamp(float(xi) / 32767.0, -1.0, 1.0);\n" " }\n" "#endif\n" "\n" "vec2 unpackSnorm2x16_emu(uint u)\n" "{\n" " #if defined(GL_ARB_shading_language_packing)\n" " return unpackSnorm2x16(u);\n" " #else\n" " uint y = (u >> 16);\n" " uint x = u;\n" " return vec2(fromSnorm(x), fromSnorm(y));\n" " #endif\n" "}\n"); // Functions uint f32tof16(float val) and float f16tof32(uint val) are // based on the OpenGL redbook Appendix Session "Floating-Point Formats Used in OpenGL". emu->addEmulatedFunction(BuiltInId::packHalf2x16_Float2, "#if !defined(GL_ARB_shading_language_packing)\n" " uint f32tof16(float val)\n" " {\n" " uint f32 = floatBitsToUint(val);\n" " uint f16 = 0u;\n" " uint sign = (f32 >> 16) & 0x8000u;\n" " int exponent = int((f32 >> 23) & 0xFFu) - 127;\n" " uint mantissa = f32 & 0x007FFFFFu;\n" " if (exponent == 128)\n" " {\n" " // Infinity or NaN\n" " // NaN bits that are masked out by 0x3FF get discarded.\n" " // This can turn some NaNs to infinity, but this is allowed by the spec.\n" " f16 = sign | (0x1Fu << 10);\n" " f16 |= (mantissa & 0x3FFu);\n" " }\n" " else if (exponent > 15)\n" " {\n" " // Overflow - flush to Infinity\n" " f16 = sign | (0x1Fu << 10);\n" " }\n" " else if (exponent > -15)\n" " {\n" " // Representable value\n" " exponent += 15;\n" " mantissa >>= 13;\n" " f16 = sign | uint(exponent << 10) | mantissa;\n" " }\n" " else\n" " {\n" " f16 = sign;\n" " }\n" " return f16;\n" " }\n" "#endif\n" "\n" "uint packHalf2x16_emu(vec2 v)\n" "{\n" " #if defined(GL_ARB_shading_language_packing)\n" " return packHalf2x16(v);\n" " #else\n" " uint x = f32tof16(v.x);\n" " uint y = f32tof16(v.y);\n" " return (y << 16) | x;\n" " #endif\n" "}\n"); emu->addEmulatedFunction(BuiltInId::unpackHalf2x16_UInt1, "#if !defined(GL_ARB_shading_language_packing)\n" " float f16tof32(uint val)\n" " {\n" " uint sign = (val & 0x8000u) << 16;\n" " int exponent = int((val & 0x7C00u) >> 10);\n" " uint mantissa = val & 0x03FFu;\n" " float f32 = 0.0;\n" " if(exponent == 0)\n" " {\n" " if (mantissa != 0u)\n" " {\n" " const float scale = 1.0 / (1 << 24);\n" " f32 = scale * mantissa;\n" " }\n" " }\n" " else if (exponent == 31)\n" " {\n" " return uintBitsToFloat(sign | 0x7F800000u | mantissa);\n" " }\n" " else\n" " {\n" " exponent -= 15;\n" " float scale;\n" " if(exponent < 0)\n" " {\n" " // The negative unary operator is buggy on OSX.\n" " // Work around this by using abs instead.\n" " scale = 1.0 / (1 << abs(exponent));\n" " }\n" " else\n" " {\n" " scale = 1 << exponent;\n" " }\n" " float decimal = 1.0 + float(mantissa) / float(1 << 10);\n" " f32 = scale * decimal;\n" " }\n" "\n" " if (sign != 0u)\n" " {\n" " f32 = -f32;\n" " }\n" "\n" " return f32;\n" " }\n" "#endif\n" "\n" "vec2 unpackHalf2x16_emu(uint u)\n" "{\n" " #if defined(GL_ARB_shading_language_packing)\n" " return unpackHalf2x16(u);\n" " #else\n" " uint y = (u >> 16);\n" " uint x = u & 0xFFFFu;\n" " return vec2(f16tof32(x), f16tof32(y));\n" " #endif\n" "}\n"); // clang-format on } } } // namespace sh