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// Copyright (c) 2012 The Chromium 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 "gpu/command_buffer/service/shader_translator.h"
#include <string.h>
#include <GLES2/gl2.h>
#include <algorithm>
#include "base/at_exit.h"
#include "base/command_line.h"
#include "base/lazy_instance.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/trace_event/trace_event.h"
#include "gpu/command_buffer/service/gpu_switches.h"
#include "ui/gl/gl_implementation.h"
namespace gpu {
namespace gles2 {
namespace {
class ShaderTranslatorInitializer {
public:
ShaderTranslatorInitializer() {
TRACE_EVENT0("gpu", "ShInitialize");
CHECK(ShInitialize());
}
~ShaderTranslatorInitializer() {
TRACE_EVENT0("gpu", "ShFinalize");
ShFinalize();
}
};
base::LazyInstance<ShaderTranslatorInitializer> g_translator_initializer =
LAZY_INSTANCE_INITIALIZER;
void GetAttributes(ShHandle compiler, AttributeMap* var_map) {
if (!var_map)
return;
var_map->clear();
const std::vector<sh::Attribute>* attribs = ShGetAttributes(compiler);
if (attribs) {
for (size_t ii = 0; ii < attribs->size(); ++ii)
(*var_map)[(*attribs)[ii].mappedName] = (*attribs)[ii];
}
}
void GetUniforms(ShHandle compiler, UniformMap* var_map) {
if (!var_map)
return;
var_map->clear();
const std::vector<sh::Uniform>* uniforms = ShGetUniforms(compiler);
if (uniforms) {
for (size_t ii = 0; ii < uniforms->size(); ++ii)
(*var_map)[(*uniforms)[ii].mappedName] = (*uniforms)[ii];
}
}
void GetVaryings(ShHandle compiler, VaryingMap* var_map) {
if (!var_map)
return;
var_map->clear();
const std::vector<sh::Varying>* varyings = ShGetVaryings(compiler);
if (varyings) {
for (size_t ii = 0; ii < varyings->size(); ++ii)
(*var_map)[(*varyings)[ii].mappedName] = (*varyings)[ii];
}
}
void GetNameHashingInfo(ShHandle compiler, NameMap* name_map) {
if (!name_map)
return;
name_map->clear();
typedef std::map<std::string, std::string> NameMapANGLE;
const NameMapANGLE* angle_map = ShGetNameHashingMap(compiler);
DCHECK(angle_map);
for (NameMapANGLE::const_iterator iter = angle_map->begin();
iter != angle_map->end(); ++iter) {
// Note that in ANGLE, the map is (original_name, hash);
// here, we want (hash, original_name).
(*name_map)[iter->second] = iter->first;
}
}
} // namespace
ShaderTranslator::DestructionObserver::DestructionObserver() {
}
ShaderTranslator::DestructionObserver::~DestructionObserver() {
}
ShaderTranslator::ShaderTranslator()
: compiler_(NULL),
implementation_is_glsl_es_(false),
driver_bug_workarounds_(static_cast<ShCompileOptions>(0)) {
}
bool ShaderTranslator::Init(
GLenum shader_type,
ShShaderSpec shader_spec,
const ShBuiltInResources* resources,
ShaderTranslatorInterface::GlslImplementationType glsl_implementation_type,
ShCompileOptions driver_bug_workarounds) {
// Make sure Init is called only once.
DCHECK(compiler_ == NULL);
DCHECK(shader_type == GL_FRAGMENT_SHADER || shader_type == GL_VERTEX_SHADER);
DCHECK(shader_spec == SH_GLES2_SPEC || shader_spec == SH_WEBGL_SPEC ||
shader_spec == SH_GLES3_SPEC || shader_spec == SH_WEBGL2_SPEC);
DCHECK(resources != NULL);
g_translator_initializer.Get();
ShShaderOutput shader_output;
if (glsl_implementation_type == kGlslES) {
shader_output = SH_ESSL_OUTPUT;
} else {
// TODO(kbr): clean up the tests of shader_spec and
// gfx::GetGLImplementation(). crbug.com/471960
if (shader_spec == SH_WEBGL2_SPEC ||
gfx::GetGLImplementation() ==
gfx::kGLImplementationDesktopGLCoreProfile) {
shader_output = SH_GLSL_CORE_OUTPUT;
} else {
shader_output = SH_GLSL_COMPATIBILITY_OUTPUT;
}
}
{
TRACE_EVENT0("gpu", "ShConstructCompiler");
compiler_ = ShConstructCompiler(
shader_type, shader_spec, shader_output, resources);
}
implementation_is_glsl_es_ = (glsl_implementation_type == kGlslES);
driver_bug_workarounds_ = driver_bug_workarounds;
return compiler_ != NULL;
}
int ShaderTranslator::GetCompileOptions() const {
int compile_options =
SH_OBJECT_CODE | SH_VARIABLES | SH_ENFORCE_PACKING_RESTRICTIONS |
SH_LIMIT_EXPRESSION_COMPLEXITY | SH_LIMIT_CALL_STACK_DEPTH |
SH_CLAMP_INDIRECT_ARRAY_BOUNDS;
if (base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kGLShaderIntermOutput))
compile_options |= SH_INTERMEDIATE_TREE;
compile_options |= driver_bug_workarounds_;
return compile_options;
}
bool ShaderTranslator::Translate(const std::string& shader_source,
std::string* info_log,
std::string* translated_source,
AttributeMap* attrib_map,
UniformMap* uniform_map,
VaryingMap* varying_map,
NameMap* name_map) const {
// Make sure this instance is initialized.
DCHECK(compiler_ != NULL);
bool success = false;
{
TRACE_EVENT0("gpu", "ShCompile");
const char* const shader_strings[] = { shader_source.c_str() };
success = ShCompile(
compiler_, shader_strings, 1, GetCompileOptions());
}
if (success) {
// Get translated shader.
if (translated_source) {
*translated_source = ShGetObjectCode(compiler_);
}
// Get info for attribs, uniforms, and varyings.
GetAttributes(compiler_, attrib_map);
GetUniforms(compiler_, uniform_map);
GetVaryings(compiler_, varying_map);
// Get info for name hashing.
GetNameHashingInfo(compiler_, name_map);
}
// Get info log.
if (info_log) {
*info_log = ShGetInfoLog(compiler_);
}
return success;
}
std::string ShaderTranslator::GetStringForOptionsThatWouldAffectCompilation()
const {
DCHECK(compiler_ != NULL);
return std::string(":CompileOptions:" +
base::IntToString(GetCompileOptions())) +
ShGetBuiltInResourcesString(compiler_);
}
void ShaderTranslator::AddDestructionObserver(
DestructionObserver* observer) {
destruction_observers_.AddObserver(observer);
}
void ShaderTranslator::RemoveDestructionObserver(
DestructionObserver* observer) {
destruction_observers_.RemoveObserver(observer);
}
ShaderTranslator::~ShaderTranslator() {
FOR_EACH_OBSERVER(DestructionObserver,
destruction_observers_,
OnDestruct(this));
if (compiler_ != NULL)
ShDestruct(compiler_);
}
} // namespace gles2
} // namespace gpu
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