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shader_translator.cpp
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shader_translator.cpp
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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 "GLSLANG/ShaderLang.h"
#include <assert.h>
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sstream>
#include <vector>
#include "angle_gl.h"
#if defined(ANGLE_ENABLE_VULKAN)
// SPIR-V tools include for disassembly.
# include <spirv-tools/libspirv.hpp>
#endif
//
// Return codes from main.
//
enum TFailCode
{
ESuccess = 0,
EFailUsage,
EFailCompile,
EFailCompilerCreate,
};
static void usage();
static sh::GLenum FindShaderType(const char *fileName);
static bool CompileFile(char *fileName, ShHandle compiler, const ShCompileOptions &compileOptions);
static void LogMsg(const char *msg, const char *name, const int num, const char *logName);
static void PrintVariable(const std::string &prefix, size_t index, const sh::ShaderVariable &var);
static void PrintActiveVariables(ShHandle compiler);
// If NUM_SOURCE_STRINGS is set to a value > 1, the input file data is
// broken into that many chunks. This will affect file/line numbering in
// the preprocessor.
const unsigned int NUM_SOURCE_STRINGS = 1;
typedef std::vector<char *> ShaderSource;
static bool ReadShaderSource(const char *fileName, ShaderSource &source);
static void FreeShaderSource(ShaderSource &source);
static bool ParseGLSLOutputVersion(const std::string &, ShShaderOutput *outResult);
static bool ParseIntValue(const std::string &, int emptyDefault, int *outValue);
static void PrintSpirv(const sh::BinaryBlob &blob);
//
// Set up the per compile resources
//
void GenerateResources(ShBuiltInResources *resources)
{
sh::InitBuiltInResources(resources);
resources->MaxVertexAttribs = 8;
resources->MaxVertexUniformVectors = 128;
resources->MaxVaryingVectors = 8;
resources->MaxVertexTextureImageUnits = 0;
resources->MaxCombinedTextureImageUnits = 8;
resources->MaxTextureImageUnits = 8;
resources->MaxFragmentUniformVectors = 16;
resources->MaxDrawBuffers = 1;
resources->MaxDualSourceDrawBuffers = 1;
resources->OES_standard_derivatives = 0;
resources->OES_EGL_image_external = 0;
resources->EXT_geometry_shader = 1;
resources->ANGLE_texture_multisample = 0;
resources->APPLE_clip_distance = 0;
}
int main(int argc, char *argv[])
{
TFailCode failCode = ESuccess;
ShCompileOptions compileOptions = {};
int numCompiles = 0;
ShHandle vertexCompiler = 0;
ShHandle fragmentCompiler = 0;
ShHandle computeCompiler = 0;
ShHandle geometryCompiler = 0;
ShHandle tessEvalCompiler = 0;
ShHandle tessControlCompiler = 0;
ShShaderSpec spec = SH_GLES2_SPEC;
ShShaderOutput output = SH_ESSL_OUTPUT;
sh::Initialize();
ShBuiltInResources resources;
GenerateResources(&resources);
bool printActiveVariables = false;
argc--;
argv++;
for (; (argc >= 1) && (failCode == ESuccess); argc--, argv++)
{
if (argv[0][0] == '-')
{
switch (argv[0][1])
{
case 'i':
compileOptions.intermediateTree = true;
break;
case 'o':
compileOptions.objectCode = true;
break;
case 'u':
printActiveVariables = true;
break;
case 's':
if (argv[0][2] == '=')
{
switch (argv[0][3])
{
case 'e':
if (argv[0][4] == '3')
{
if (argv[0][5] == '1')
{
spec = SH_GLES3_1_SPEC;
}
else if (argv[0][5] == '2')
{
spec = SH_GLES3_2_SPEC;
}
else
{
spec = SH_GLES3_SPEC;
}
}
else
{
spec = SH_GLES2_SPEC;
}
break;
case 'w':
if (argv[0][4] == '3')
{
spec = SH_WEBGL3_SPEC;
}
else if (argv[0][4] == '2')
{
spec = SH_WEBGL2_SPEC;
}
else if (argv[0][4] == 'n')
{
spec = SH_WEBGL_SPEC;
}
else
{
spec = SH_WEBGL_SPEC;
resources.FragmentPrecisionHigh = 1;
}
break;
default:
failCode = EFailUsage;
}
}
else
{
failCode = EFailUsage;
}
break;
case 'b':
if (argv[0][2] == '=')
{
switch (argv[0][3])
{
case 'e':
output = SH_ESSL_OUTPUT;
compileOptions.initializeUninitializedLocals = true;
break;
case 'g':
if (!ParseGLSLOutputVersion(&argv[0][sizeof("-b=g") - 1], &output))
{
failCode = EFailUsage;
}
compileOptions.initializeUninitializedLocals = true;
break;
case 'v':
output = SH_SPIRV_VULKAN_OUTPUT;
compileOptions.initializeUninitializedLocals = true;
break;
case 'h':
if (argv[0][4] == '1' && argv[0][5] == '1')
{
output = SH_HLSL_4_1_OUTPUT;
}
else
{
output = SH_HLSL_3_0_OUTPUT;
}
break;
case 'm':
output = SH_MSL_METAL_OUTPUT;
break;
default:
failCode = EFailUsage;
}
}
else
{
failCode = EFailUsage;
}
break;
case 'x':
if (argv[0][2] == '=')
{
// clang-format off
switch (argv[0][3])
{
case 'i': resources.OES_EGL_image_external = 1; break;
case 'd': resources.OES_standard_derivatives = 1; break;
case 'r': resources.ARB_texture_rectangle = 1; break;
case 'b':
if (ParseIntValue(&argv[0][sizeof("-x=b") - 1], 1,
&resources.MaxDualSourceDrawBuffers))
{
resources.EXT_blend_func_extended = 1;
}
else
{
failCode = EFailUsage;
}
break;
case 'w':
if (ParseIntValue(&argv[0][sizeof("-x=w") - 1], 1,
&resources.MaxDrawBuffers))
{
resources.EXT_draw_buffers = 1;
}
else
{
failCode = EFailUsage;
}
break;
case 'g': resources.EXT_frag_depth = 1; break;
case 'l': resources.EXT_shader_texture_lod = 1; break;
case 'f': resources.EXT_shader_framebuffer_fetch = 1; break;
case 'n': resources.NV_shader_framebuffer_fetch = 1; break;
case 'a': resources.ARM_shader_framebuffer_fetch = 1; break;
case 'm':
resources.OVR_multiview2 = 1;
resources.OVR_multiview = 1;
compileOptions.initializeBuiltinsForInstancedMultiview = true;
compileOptions.selectViewInNvGLSLVertexShader = true;
break;
case 'y': resources.EXT_YUV_target = 1; break;
case 's': resources.OES_sample_variables = 1; break;
default: failCode = EFailUsage;
}
// clang-format on
}
else
{
failCode = EFailUsage;
}
break;
default:
failCode = EFailUsage;
}
}
else
{
if (spec != SH_GLES2_SPEC && spec != SH_WEBGL_SPEC)
{
resources.MaxDrawBuffers = 8;
resources.MaxVertexTextureImageUnits = 16;
resources.MaxTextureImageUnits = 16;
}
ShHandle compiler = 0;
switch (FindShaderType(argv[0]))
{
case GL_VERTEX_SHADER:
if (vertexCompiler == 0)
{
vertexCompiler =
sh::ConstructCompiler(GL_VERTEX_SHADER, spec, output, &resources);
}
compiler = vertexCompiler;
break;
case GL_FRAGMENT_SHADER:
if (fragmentCompiler == 0)
{
fragmentCompiler =
sh::ConstructCompiler(GL_FRAGMENT_SHADER, spec, output, &resources);
}
compiler = fragmentCompiler;
break;
case GL_COMPUTE_SHADER:
if (computeCompiler == 0)
{
computeCompiler =
sh::ConstructCompiler(GL_COMPUTE_SHADER, spec, output, &resources);
}
compiler = computeCompiler;
break;
case GL_GEOMETRY_SHADER_EXT:
if (geometryCompiler == 0)
{
resources.EXT_geometry_shader = 1;
geometryCompiler =
sh::ConstructCompiler(GL_GEOMETRY_SHADER_EXT, spec, output, &resources);
}
compiler = geometryCompiler;
break;
case GL_TESS_CONTROL_SHADER_EXT:
if (tessControlCompiler == 0)
{
assert(spec == SH_GLES3_1_SPEC || spec == SH_GLES3_2_SPEC);
resources.EXT_tessellation_shader = 1;
tessControlCompiler = sh::ConstructCompiler(GL_TESS_CONTROL_SHADER_EXT,
spec, output, &resources);
}
compiler = tessControlCompiler;
break;
case GL_TESS_EVALUATION_SHADER_EXT:
if (tessEvalCompiler == 0)
{
assert(spec == SH_GLES3_1_SPEC || spec == SH_GLES3_2_SPEC);
resources.EXT_tessellation_shader = 1;
tessEvalCompiler = sh::ConstructCompiler(GL_TESS_EVALUATION_SHADER_EXT,
spec, output, &resources);
}
compiler = tessEvalCompiler;
break;
default:
break;
}
if (compiler)
{
switch (output)
{
case SH_HLSL_3_0_OUTPUT:
case SH_HLSL_4_1_OUTPUT:
compileOptions.selectViewInNvGLSLVertexShader = false;
break;
default:
break;
}
bool compiled = CompileFile(argv[0], compiler, compileOptions);
LogMsg("BEGIN", "COMPILER", numCompiles, "INFO LOG");
std::string log = sh::GetInfoLog(compiler);
puts(log.c_str());
LogMsg("END", "COMPILER", numCompiles, "INFO LOG");
printf("\n\n");
if (compiled && compileOptions.objectCode)
{
LogMsg("BEGIN", "COMPILER", numCompiles, "OBJ CODE");
if (output != SH_SPIRV_VULKAN_OUTPUT)
{
const std::string &code = sh::GetObjectCode(compiler);
puts(code.c_str());
}
else
{
const sh::BinaryBlob &blob = sh::GetObjectBinaryBlob(compiler);
PrintSpirv(blob);
}
LogMsg("END", "COMPILER", numCompiles, "OBJ CODE");
printf("\n\n");
}
if (compiled && printActiveVariables)
{
LogMsg("BEGIN", "COMPILER", numCompiles, "VARIABLES");
PrintActiveVariables(compiler);
LogMsg("END", "COMPILER", numCompiles, "VARIABLES");
printf("\n\n");
}
if (!compiled)
failCode = EFailCompile;
++numCompiles;
}
else
{
failCode = EFailCompilerCreate;
}
}
}
if ((vertexCompiler == 0) && (fragmentCompiler == 0) && (computeCompiler == 0) &&
(geometryCompiler == 0) && (tessControlCompiler == 0) && (tessEvalCompiler == 0))
{
failCode = EFailUsage;
}
if (failCode == EFailUsage)
{
usage();
}
if (vertexCompiler)
{
sh::Destruct(vertexCompiler);
}
if (fragmentCompiler)
{
sh::Destruct(fragmentCompiler);
}
if (computeCompiler)
{
sh::Destruct(computeCompiler);
}
if (geometryCompiler)
{
sh::Destruct(geometryCompiler);
}
if (tessControlCompiler)
{
sh::Destruct(tessControlCompiler);
}
if (tessEvalCompiler)
{
sh::Destruct(tessEvalCompiler);
}
sh::Finalize();
return failCode;
}
//
// print usage to stdout
//
void usage()
{
// clang-format off
printf(
"Usage: translate [-i -o -u -l -b=e -b=g -b=h9 -x=i -x=d] file1 file2 ...\n"
"Where: filename : filename ending in .frag*, .vert*, .comp*, .geom*, .tcs* or .tes*\n"
" -i : print intermediate tree\n"
" -o : print translated code\n"
" -u : print active attribs, uniforms, varyings and program outputs\n"
" -s=e2 : use GLES2 spec (this is by default)\n"
" -s=e3 : use GLES3 spec\n"
" -s=e31 : use GLES31 spec (in development)\n"
" -s=e32 : use GLES32 spec (in development)\n"
" -s=w : use WebGL 1.0 spec\n"
" -s=wn : use WebGL 1.0 spec with no highp support in fragment shaders\n"
" -s=w2 : use WebGL 2.0 spec\n"
" -b=e : output GLSL ES code (this is by default)\n"
" -b=g : output GLSL code (compatibility profile)\n"
" -b=g[NUM]: output GLSL code (NUM can be 130, 140, 150, 330, 400, 410, 420, 430, "
"440, 450)\n"
" -b=v : output Vulkan SPIR-V code\n"
" -b=h9 : output HLSL9 code\n"
" -b=h11 : output HLSL11 code\n"
" -b=m : output MSL code (direct)\n"
" -x=i : enable GL_OES_EGL_image_external\n"
" -x=d : enable GL_OES_EGL_standard_derivatives\n"
" -x=r : enable ARB_texture_rectangle\n"
" -x=b[NUM]: enable EXT_blend_func_extended (NUM default 1)\n"
" -x=w[NUM]: enable EXT_draw_buffers (NUM default 1)\n"
" -x=g : enable EXT_frag_depth\n"
" -x=l : enable EXT_shader_texture_lod\n"
" -x=f : enable EXT_shader_framebuffer_fetch\n"
" -x=n : enable NV_shader_framebuffer_fetch\n"
" -x=a : enable ARM_shader_framebuffer_fetch\n"
" -x=m : enable OVR_multiview\n"
" -x=y : enable YUV_target\n"
" -x=s : enable OES_sample_variables\n");
// clang-format on
}
//
// Deduce the shader type from the filename. Files must end in one of the
// following extensions:
//
// .frag* = fragment shader
// .vert* = vertex shader
// .comp* = compute shader
// .geom* = geometry shader
// .tcs* = tessellation control shader
// .tes* = tessellation evaluation shader
//
sh::GLenum FindShaderType(const char *fileName)
{
assert(fileName);
const char *ext = strrchr(fileName, '.');
if (ext && strcmp(ext, ".sl") == 0)
for (; ext > fileName && ext[0] != '.'; ext--)
;
ext = strrchr(fileName, '.');
if (ext)
{
if (strncmp(ext, ".frag", 5) == 0)
return GL_FRAGMENT_SHADER;
if (strncmp(ext, ".vert", 5) == 0)
return GL_VERTEX_SHADER;
if (strncmp(ext, ".comp", 5) == 0)
return GL_COMPUTE_SHADER;
if (strncmp(ext, ".geom", 5) == 0)
return GL_GEOMETRY_SHADER_EXT;
if (strncmp(ext, ".tcs", 5) == 0)
return GL_TESS_CONTROL_SHADER_EXT;
if (strncmp(ext, ".tes", 5) == 0)
return GL_TESS_EVALUATION_SHADER_EXT;
}
return GL_FRAGMENT_SHADER;
}
//
// Read a file's data into a string, and compile it using sh::Compile
//
bool CompileFile(char *fileName, ShHandle compiler, const ShCompileOptions &compileOptions)
{
ShaderSource source;
if (!ReadShaderSource(fileName, source))
return false;
int ret = sh::Compile(compiler, &source[0], source.size(), compileOptions);
FreeShaderSource(source);
return ret ? true : false;
}
void LogMsg(const char *msg, const char *name, const int num, const char *logName)
{
printf("#### %s %s %d %s ####\n", msg, name, num, logName);
}
void PrintVariable(const std::string &prefix, size_t index, const sh::ShaderVariable &var)
{
std::string typeName;
switch (var.type)
{
case GL_FLOAT:
typeName = "GL_FLOAT";
break;
case GL_FLOAT_VEC2:
typeName = "GL_FLOAT_VEC2";
break;
case GL_FLOAT_VEC3:
typeName = "GL_FLOAT_VEC3";
break;
case GL_FLOAT_VEC4:
typeName = "GL_FLOAT_VEC4";
break;
case GL_INT:
typeName = "GL_INT";
break;
case GL_INT_VEC2:
typeName = "GL_INT_VEC2";
break;
case GL_INT_VEC3:
typeName = "GL_INT_VEC3";
break;
case GL_INT_VEC4:
typeName = "GL_INT_VEC4";
break;
case GL_UNSIGNED_INT:
typeName = "GL_UNSIGNED_INT";
break;
case GL_UNSIGNED_INT_VEC2:
typeName = "GL_UNSIGNED_INT_VEC2";
break;
case GL_UNSIGNED_INT_VEC3:
typeName = "GL_UNSIGNED_INT_VEC3";
break;
case GL_UNSIGNED_INT_VEC4:
typeName = "GL_UNSIGNED_INT_VEC4";
break;
case GL_BOOL:
typeName = "GL_BOOL";
break;
case GL_BOOL_VEC2:
typeName = "GL_BOOL_VEC2";
break;
case GL_BOOL_VEC3:
typeName = "GL_BOOL_VEC3";
break;
case GL_BOOL_VEC4:
typeName = "GL_BOOL_VEC4";
break;
case GL_FLOAT_MAT2:
typeName = "GL_FLOAT_MAT2";
break;
case GL_FLOAT_MAT3:
typeName = "GL_FLOAT_MAT3";
break;
case GL_FLOAT_MAT4:
typeName = "GL_FLOAT_MAT4";
break;
case GL_FLOAT_MAT2x3:
typeName = "GL_FLOAT_MAT2x3";
break;
case GL_FLOAT_MAT3x2:
typeName = "GL_FLOAT_MAT3x2";
break;
case GL_FLOAT_MAT4x2:
typeName = "GL_FLOAT_MAT4x2";
break;
case GL_FLOAT_MAT2x4:
typeName = "GL_FLOAT_MAT2x4";
break;
case GL_FLOAT_MAT3x4:
typeName = "GL_FLOAT_MAT3x4";
break;
case GL_FLOAT_MAT4x3:
typeName = "GL_FLOAT_MAT4x3";
break;
case GL_SAMPLER_2D:
typeName = "GL_SAMPLER_2D";
break;
case GL_SAMPLER_3D:
typeName = "GL_SAMPLER_3D";
break;
case GL_SAMPLER_CUBE:
typeName = "GL_SAMPLER_CUBE";
break;
case GL_SAMPLER_CUBE_SHADOW:
typeName = "GL_SAMPLER_CUBE_SHADOW";
break;
case GL_SAMPLER_2D_SHADOW:
typeName = "GL_SAMPLER_2D_ARRAY_SHADOW";
break;
case GL_SAMPLER_2D_ARRAY:
typeName = "GL_SAMPLER_2D_ARRAY";
break;
case GL_SAMPLER_2D_ARRAY_SHADOW:
typeName = "GL_SAMPLER_2D_ARRAY_SHADOW";
break;
case GL_SAMPLER_2D_MULTISAMPLE:
typeName = "GL_SAMPLER_2D_MULTISAMPLE";
break;
case GL_IMAGE_2D:
typeName = "GL_IMAGE_2D";
break;
case GL_IMAGE_3D:
typeName = "GL_IMAGE_3D";
break;
case GL_IMAGE_CUBE:
typeName = "GL_IMAGE_CUBE";
break;
case GL_IMAGE_2D_ARRAY:
typeName = "GL_IMAGE_2D_ARRAY";
break;
case GL_INT_SAMPLER_2D:
typeName = "GL_INT_SAMPLER_2D";
break;
case GL_INT_SAMPLER_3D:
typeName = "GL_INT_SAMPLER_3D";
break;
case GL_INT_SAMPLER_CUBE:
typeName = "GL_INT_SAMPLER_CUBE";
break;
case GL_INT_SAMPLER_2D_ARRAY:
typeName = "GL_INT_SAMPLER_2D_ARRAY";
break;
case GL_INT_SAMPLER_2D_MULTISAMPLE:
typeName = "GL_INT_SAMPLER_2D_MULTISAMPLE";
break;
case GL_INT_IMAGE_2D:
typeName = "GL_INT_IMAGE_2D";
break;
case GL_INT_IMAGE_3D:
typeName = "GL_INT_IMAGE_3D";
break;
case GL_INT_IMAGE_CUBE:
typeName = "GL_INT_IMAGE_CUBE";
break;
case GL_INT_IMAGE_2D_ARRAY:
typeName = "GL_INT_IMAGE_2D_ARRAY";
break;
case GL_UNSIGNED_INT_SAMPLER_2D:
typeName = "GL_UNSIGNED_INT_SAMPLER_2D";
break;
case GL_UNSIGNED_INT_SAMPLER_3D:
typeName = "GL_UNSIGNED_INT_SAMPLER_3D";
break;
case GL_UNSIGNED_INT_SAMPLER_CUBE:
typeName = "GL_UNSIGNED_INT_SAMPLER_CUBE";
break;
case GL_UNSIGNED_INT_SAMPLER_2D_ARRAY:
typeName = "GL_UNSIGNED_INT_SAMPLER_2D_ARRAY";
break;
case GL_UNSIGNED_INT_ATOMIC_COUNTER:
typeName = "GL_UNSIGNED_INT_ATOMIC_COUNTER";
break;
case GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE:
typeName = "GL_UNSIGNED_INT_SAMPLER_2D_MULTISAMPLE";
break;
case GL_UNSIGNED_INT_IMAGE_2D:
typeName = "GL_UNSIGNED_INT_IMAGE_2D";
break;
case GL_UNSIGNED_INT_IMAGE_3D:
typeName = "GL_UNSIGNED_INT_IMAGE_3D";
break;
case GL_UNSIGNED_INT_IMAGE_CUBE:
typeName = "GL_UNSIGNED_INT_IMAGE_CUBE";
break;
case GL_UNSIGNED_INT_IMAGE_2D_ARRAY:
typeName = "GL_UNSIGNED_INT_IMAGE_2D_ARRAY";
break;
case GL_SAMPLER_EXTERNAL_OES:
typeName = "GL_SAMPLER_EXTERNAL_OES";
break;
case GL_SAMPLER_EXTERNAL_2D_Y2Y_EXT:
typeName = "GL_SAMPLER_EXTERNAL_2D_Y2Y_EXT";
break;
default:
typeName = "UNKNOWN";
break;
}
printf("%s %u : name=%s, mappedName=%s, type=%s, arraySizes=", prefix.c_str(),
static_cast<unsigned int>(index), var.name.c_str(), var.mappedName.c_str(),
typeName.c_str());
for (unsigned int arraySize : var.arraySizes)
{
printf("%u ", arraySize);
}
printf("\n");
if (var.fields.size())
{
std::string structPrefix;
for (size_t i = 0; i < prefix.size(); ++i)
structPrefix += ' ';
printf("%s struct %s\n", structPrefix.c_str(), var.structOrBlockName.c_str());
structPrefix += " field";
for (size_t i = 0; i < var.fields.size(); ++i)
PrintVariable(structPrefix, i, var.fields[i]);
}
}
static void PrintActiveVariables(ShHandle compiler)
{
const std::vector<sh::ShaderVariable> *uniforms = sh::GetUniforms(compiler);
const std::vector<sh::ShaderVariable> *inputVaryings = sh::GetInputVaryings(compiler);
const std::vector<sh::ShaderVariable> *outputVaryings = sh::GetOutputVaryings(compiler);
const std::vector<sh::ShaderVariable> *attributes = sh::GetAttributes(compiler);
const std::vector<sh::ShaderVariable> *outputs = sh::GetOutputVariables(compiler);
for (size_t varCategory = 0; varCategory < 5; ++varCategory)
{
size_t numVars = 0;
std::string varCategoryName;
if (varCategory == 0)
{
numVars = uniforms->size();
varCategoryName = "uniform";
}
else if (varCategory == 1)
{
numVars = inputVaryings->size();
varCategoryName = "input varying";
}
else if (varCategory == 2)
{
numVars = outputVaryings->size();
varCategoryName = "output varying";
}
else if (varCategory == 3)
{
numVars = attributes->size();
varCategoryName = "attribute";
}
else
{
numVars = outputs->size();
varCategoryName = "output";
}
for (size_t i = 0; i < numVars; ++i)
{
const sh::ShaderVariable *var;
if (varCategory == 0)
var = &((*uniforms)[i]);
else if (varCategory == 1)
var = &((*inputVaryings)[i]);
else if (varCategory == 2)
var = &((*outputVaryings)[i]);
else if (varCategory == 3)
var = &((*attributes)[i]);
else
var = &((*outputs)[i]);
PrintVariable(varCategoryName, i, *var);
}
printf("\n");
}
}
static bool ReadShaderSource(const char *fileName, ShaderSource &source)
{
FILE *in = fopen(fileName, "rb");
if (!in)
{
printf("Error: unable to open input file: %s\n", fileName);
return false;
}
// Obtain file size.
fseek(in, 0, SEEK_END);
size_t count = ftell(in);
rewind(in);
int len = (int)ceil((float)count / (float)NUM_SOURCE_STRINGS);
source.reserve(NUM_SOURCE_STRINGS);
// Notice the usage of do-while instead of a while loop here.
// It is there to handle empty files in which case a single empty
// string is added to vector.
do
{
char *data = new char[len + 1];
size_t nread = fread(data, 1, len, in);
data[nread] = '\0';
source.push_back(data);
count -= nread;
} while (count > 0);
fclose(in);
return true;
}
static void FreeShaderSource(ShaderSource &source)
{
for (ShaderSource::size_type i = 0; i < source.size(); ++i)
{
delete[] source[i];
}
source.clear();
}
static bool ParseGLSLOutputVersion(const std::string &num, ShShaderOutput *outResult)
{
if (num.length() == 0)
{
*outResult = SH_GLSL_COMPATIBILITY_OUTPUT;
return true;
}
std::istringstream input(num);
int value;
if (!(input >> value && input.eof()))
{
return false;
}
switch (value)
{
case 130:
*outResult = SH_GLSL_130_OUTPUT;
return true;
case 140:
*outResult = SH_GLSL_140_OUTPUT;
return true;
case 150:
*outResult = SH_GLSL_150_CORE_OUTPUT;
return true;
case 330:
*outResult = SH_GLSL_330_CORE_OUTPUT;
return true;
case 400:
*outResult = SH_GLSL_400_CORE_OUTPUT;
return true;
case 410:
*outResult = SH_GLSL_410_CORE_OUTPUT;
return true;
case 420:
*outResult = SH_GLSL_420_CORE_OUTPUT;
return true;
case 430:
*outResult = SH_GLSL_430_CORE_OUTPUT;
return true;
case 440:
*outResult = SH_GLSL_440_CORE_OUTPUT;
return true;
case 450:
*outResult = SH_GLSL_450_CORE_OUTPUT;
return true;
default:
break;
}
return false;
}
static bool ParseIntValue(const std::string &num, int emptyDefault, int *outValue)
{
if (num.length() == 0)
{
*outValue = emptyDefault;
return true;
}
std::istringstream input(num);
int value;
if (!(input >> value && input.eof()))
{
return false;
}
*outValue = value;
return true;
}
static void PrintSpirv(const sh::BinaryBlob &blob)
{
#if defined(ANGLE_ENABLE_VULKAN)
spvtools::SpirvTools spirvTools(SPV_ENV_VULKAN_1_1);
std::string readableSpirv;
spirvTools.Disassemble(blob, &readableSpirv,
SPV_BINARY_TO_TEXT_OPTION_COMMENT | SPV_BINARY_TO_TEXT_OPTION_INDENT |
SPV_BINARY_TO_TEXT_OPTION_NESTED_INDENT);
puts(readableSpirv.c_str());
#endif
}