Hash :
56e9bfff
Author :
Date :
2025-06-19T00:00:00
GL: Remove obsolete macOS workarounds Bug: angleproject:427600175 Change-Id: I8bfc062b71f1a34de09cbf76b504293ccd081fe0 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6676022 Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com>
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//
// Copyright 2002 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/glsl/BuiltInFunctionEmulatorGLSL.h"
#include "angle_gl.h"
#include "compiler/translator/BuiltInFunctionEmulator.h"
#include "compiler/translator/glsl/VersionGLSL.h"
#include "compiler/translator/tree_util/BuiltIn.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 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");
emu->addEmulatedFunctionWithDependency(
BuiltInId::atan_Float1_Float1, BuiltInId::atan_Float2_Float2,
"emu_precision vec2 atan_emu(emu_precision vec2 y, emu_precision vec2 x)\n"
"{\n"
" return vec2(atan_emu(y[0], x[0]), atan_emu(y[1], x[1]));\n"
"}\n");
emu->addEmulatedFunctionWithDependency(
BuiltInId::atan_Float1_Float1, BuiltInId::atan_Float3_Float3,
"emu_precision vec3 atan_emu(emu_precision vec3 y, emu_precision vec3 x)\n"
"{\n"
" return vec3(atan_emu(y[0], x[0]), atan_emu(y[1], x[1]), atan_emu(y[2], x[2]));\n"
"}\n");
emu->addEmulatedFunctionWithDependency(
BuiltInId::atan_Float1_Float1, BuiltInId::atan_Float4_Float4,
"emu_precision vec4 atan_emu(emu_precision vec4 y, emu_precision vec4 x)\n"
"{\n"
" return vec4(atan_emu(y[0], x[0]), atan_emu(y[1], x[1]), atan_emu(y[2], x[2]), "
"atan_emu(y[3], x[3]))\n;"
"}\n");
}
// 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