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-rw-r--r--gfx/angle/checkout/src/compiler/translator/BuiltInFunctionEmulatorGLSL.cpp284
1 files changed, 284 insertions, 0 deletions
diff --git a/gfx/angle/checkout/src/compiler/translator/BuiltInFunctionEmulatorGLSL.cpp b/gfx/angle/checkout/src/compiler/translator/BuiltInFunctionEmulatorGLSL.cpp
new file mode 100644
index 0000000000..9212336585
--- /dev/null
+++ b/gfx/angle/checkout/src/compiler/translator/BuiltInFunctionEmulatorGLSL.cpp
@@ -0,0 +1,284 @@
+//
+// 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/BuiltInFunctionEmulatorGLSL.h"
+
+#include "angle_gl.h"
+#include "compiler/translator/BuiltInFunctionEmulator.h"
+#include "compiler/translator/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 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 = sh::InitializeStream<std::stringstream>();
+ 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
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