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//
// Copyright (c) 2014 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.
//
// Compiler.cpp: implements the gl::Compiler class.
#include "libANGLE/Compiler.h"
#include "common/debug.h"
#include "libANGLE/Data.h"
#include "libANGLE/renderer/CompilerImpl.h"
#include "libANGLE/renderer/ImplFactory.h"
namespace gl
{
namespace
{
// Global count of active shader compiler handles. Needed to know when to call ShInitialize and
// ShFinalize.
size_t activeCompilerHandles = 0;
} // anonymous namespace
Compiler::Compiler(rx::ImplFactory *implFactory, const gl::Data &data)
: mImplementation(implFactory->createCompiler()),
mSpec(data.clientVersion > 2 ? SH_GLES3_SPEC : SH_GLES2_SPEC),
mOutputType(mImplementation->getTranslatorOutputType()),
mResources(),
mFragmentCompiler(nullptr),
mVertexCompiler(nullptr)
{
ASSERT(data.clientVersion == 2 || data.clientVersion == 3);
const gl::Caps &caps = *data.caps;
const gl::Extensions &extensions = *data.extensions;
ShInitBuiltInResources(&mResources);
mResources.MaxVertexAttribs = caps.maxVertexAttributes;
mResources.MaxVertexUniformVectors = caps.maxVertexUniformVectors;
mResources.MaxVaryingVectors = caps.maxVaryingVectors;
mResources.MaxVertexTextureImageUnits = caps.maxVertexTextureImageUnits;
mResources.MaxCombinedTextureImageUnits = caps.maxCombinedTextureImageUnits;
mResources.MaxTextureImageUnits = caps.maxTextureImageUnits;
mResources.MaxFragmentUniformVectors = caps.maxFragmentUniformVectors;
mResources.MaxDrawBuffers = caps.maxDrawBuffers;
mResources.OES_standard_derivatives = extensions.standardDerivatives;
mResources.EXT_draw_buffers = extensions.drawBuffers;
mResources.EXT_shader_texture_lod = extensions.shaderTextureLOD;
// TODO: disabled until the extension is actually supported.
mResources.OES_EGL_image_external = 0;
// TODO: use shader precision caps to determine if high precision is supported?
mResources.FragmentPrecisionHigh = 1;
mResources.EXT_frag_depth = extensions.fragDepth;
// GLSL ES 3.0 constants
mResources.MaxVertexOutputVectors = caps.maxVertexOutputComponents / 4;
mResources.MaxFragmentInputVectors = caps.maxFragmentInputComponents / 4;
mResources.MinProgramTexelOffset = caps.minProgramTexelOffset;
mResources.MaxProgramTexelOffset = caps.maxProgramTexelOffset;
}
Compiler::~Compiler()
{
release();
SafeDelete(mImplementation);
}
Error Compiler::release()
{
if (mFragmentCompiler)
{
ShDestruct(mFragmentCompiler);
mFragmentCompiler = nullptr;
ASSERT(activeCompilerHandles > 0);
activeCompilerHandles--;
}
if (mVertexCompiler)
{
ShDestruct(mVertexCompiler);
mVertexCompiler = nullptr;
ASSERT(activeCompilerHandles > 0);
activeCompilerHandles--;
}
if (activeCompilerHandles == 0)
{
ShFinalize();
}
mImplementation->release();
return gl::Error(GL_NO_ERROR);
}
ShHandle Compiler::getCompilerHandle(GLenum type)
{
ShHandle *compiler = nullptr;
switch (type)
{
case GL_VERTEX_SHADER:
compiler = &mVertexCompiler;
break;
case GL_FRAGMENT_SHADER:
compiler = &mFragmentCompiler;
break;
default:
UNREACHABLE();
return nullptr;
}
if (!(*compiler))
{
if (activeCompilerHandles == 0)
{
ShInitialize();
}
*compiler = ShConstructCompiler(type, mSpec, mOutputType, &mResources);
activeCompilerHandles++;
}
return *compiler;
}
} // namespace gl
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