Compiler.cpp

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Author : Jamie Madill
Date : 2019-11-09 16:24:50
Hash : 3f647b1b
Message : Vulkan: Improve Bresenham line emulation. Clamps the vertex position to the subpixel grid before interpolation. This will give more correct results on systems that have less than 8 bits of subpixel accuracy. Also uses a more accurate formulation for the emulation filter in the fragment shader using dfdx and dfdy. Fixes line raster CTS tests on SwiftShader. Still does not produce spec conformant lines. Updates the public docs to indicate this. Bug: angleproject:2830 Change-Id: Ib9a268df3e7d986bd2b1348be664389fe8fc0ef2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1826598 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com>
src/libANGLE/Compiler.cpp
//
// Copyright 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/State.h"
#include "libANGLE/renderer/CompilerImpl.h"
#include "libANGLE/renderer/GLImplFactory.h"

namespace gl
{

namespace
{

// To know when to call sh::Initialize and sh::Finalize.
size_t gActiveCompilers = 0;

ShShaderSpec SelectShaderSpec(GLint majorVersion,
                              GLint minorVersion,
                              bool isWebGL,
                              EGLenum clientType)
{
    // For Desktop GL
    if (clientType == EGL_OPENGL_API)
    {
        return SH_GL_COMPATIBILITY_SPEC;
    }

    if (majorVersion >= 3)
    {
        if (minorVersion == 1)
        {
            return isWebGL ? SH_WEBGL3_SPEC : SH_GLES3_1_SPEC;
        }
        else
        {
            return isWebGL ? SH_WEBGL2_SPEC : SH_GLES3_SPEC;
        }
    }

    // GLES1 emulation: Use GLES3 shader spec.
    if (!isWebGL && majorVersion == 1)
    {
        return SH_GLES3_SPEC;
    }

    return isWebGL ? SH_WEBGL_SPEC : SH_GLES2_SPEC;
}

}  // anonymous namespace

Compiler::Compiler(rx::GLImplFactory *implFactory, const State &state)
    : mImplementation(implFactory->createCompiler()),
      mSpec(SelectShaderSpec(state.getClientMajorVersion(),
                             state.getClientMinorVersion(),
                             state.getExtensions().webglCompatibility,
                             state.getClientType())),
      mOutputType(mImplementation->getTranslatorOutputType()),
      mResources()
{
    // TODO(http://anglebug.com/3819): Update for GL version specific validation
    ASSERT(state.getClientMajorVersion() == 1 || state.getClientMajorVersion() == 2 ||
           state.getClientMajorVersion() == 3 || state.getClientMajorVersion() == 4);

    const gl::Caps &caps             = state.getCaps();
    const gl::Extensions &extensions = state.getExtensions();

    if (gActiveCompilers == 0)
    {
        sh::Initialize();
    }
    ++gActiveCompilers;

    sh::InitBuiltInResources(&mResources);
    mResources.MaxVertexAttribs             = caps.maxVertexAttributes;
    mResources.MaxVertexUniformVectors      = caps.maxVertexUniformVectors;
    mResources.MaxVaryingVectors            = caps.maxVaryingVectors;
    mResources.MaxVertexTextureImageUnits   = caps.maxShaderTextureImageUnits[ShaderType::Vertex];
    mResources.MaxCombinedTextureImageUnits = caps.maxCombinedTextureImageUnits;
    mResources.MaxTextureImageUnits         = caps.maxShaderTextureImageUnits[ShaderType::Fragment];
    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;
    mResources.OES_EGL_image_external       = extensions.eglImageExternal;
    mResources.OES_EGL_image_external_essl3 = extensions.eglImageExternalEssl3;
    mResources.NV_EGL_stream_consumer_external = extensions.eglStreamConsumerExternal;
    mResources.ARB_texture_rectangle           = extensions.textureRectangle;
    mResources.OES_texture_storage_multisample_2d_array =
        extensions.textureStorageMultisample2DArray;
    mResources.OES_texture_3D                  = extensions.texture3DOES;
    mResources.ANGLE_texture_multisample       = extensions.textureMultisample;
    mResources.ANGLE_multi_draw                = extensions.multiDraw;
    mResources.ANGLE_base_vertex_base_instance = extensions.baseVertexBaseInstance;

    // TODO: use shader precision caps to determine if high precision is supported?
    mResources.FragmentPrecisionHigh = 1;
    mResources.EXT_frag_depth        = extensions.fragDepth;

    // OVR_multiview state
    mResources.OVR_multiview = extensions.multiview;

    // OVR_multiview2 state
    mResources.OVR_multiview2 = extensions.multiview2;
    mResources.MaxViewsOVR    = extensions.maxViews;

    // EXT_multisampled_render_to_texture
    mResources.EXT_multisampled_render_to_texture = extensions.multisampledRenderToTexture;

    // GLSL ES 3.0 constants
    mResources.MaxVertexOutputVectors  = caps.maxVertexOutputComponents / 4;
    mResources.MaxFragmentInputVectors = caps.maxFragmentInputComponents / 4;
    mResources.MinProgramTexelOffset   = caps.minProgramTexelOffset;
    mResources.MaxProgramTexelOffset   = caps.maxProgramTexelOffset;

    // EXT_blend_func_extended
    mResources.EXT_blend_func_extended  = extensions.blendFuncExtended;
    mResources.MaxDualSourceDrawBuffers = extensions.maxDualSourceDrawBuffers;

    // GLSL ES 3.1 constants
    mResources.MaxProgramTextureGatherOffset    = caps.maxProgramTextureGatherOffset;
    mResources.MinProgramTextureGatherOffset    = caps.minProgramTextureGatherOffset;
    mResources.MaxImageUnits                    = caps.maxImageUnits;
    mResources.MaxVertexImageUniforms           = caps.maxShaderImageUniforms[ShaderType::Vertex];
    mResources.MaxFragmentImageUniforms         = caps.maxShaderImageUniforms[ShaderType::Fragment];
    mResources.MaxComputeImageUniforms          = caps.maxShaderImageUniforms[ShaderType::Compute];
    mResources.MaxCombinedImageUniforms         = caps.maxCombinedImageUniforms;
    mResources.MaxCombinedShaderOutputResources = caps.maxCombinedShaderOutputResources;
    mResources.MaxUniformLocations              = caps.maxUniformLocations;

    for (size_t index = 0u; index < 3u; ++index)
    {
        mResources.MaxComputeWorkGroupCount[index] = caps.maxComputeWorkGroupCount[index];
        mResources.MaxComputeWorkGroupSize[index]  = caps.maxComputeWorkGroupSize[index];
    }

    mResources.MaxComputeUniformComponents = caps.maxShaderUniformComponents[ShaderType::Compute];
    mResources.MaxComputeTextureImageUnits = caps.maxShaderTextureImageUnits[ShaderType::Compute];

    mResources.MaxComputeAtomicCounters = caps.maxShaderAtomicCounters[ShaderType::Compute];
    mResources.MaxComputeAtomicCounterBuffers =
        caps.maxShaderAtomicCounterBuffers[ShaderType::Compute];

    mResources.MaxVertexAtomicCounters   = caps.maxShaderAtomicCounters[ShaderType::Vertex];
    mResources.MaxFragmentAtomicCounters = caps.maxShaderAtomicCounters[ShaderType::Fragment];
    mResources.MaxCombinedAtomicCounters = caps.maxCombinedAtomicCounters;
    mResources.MaxAtomicCounterBindings  = caps.maxAtomicCounterBufferBindings;
    mResources.MaxVertexAtomicCounterBuffers =
        caps.maxShaderAtomicCounterBuffers[ShaderType::Vertex];
    mResources.MaxFragmentAtomicCounterBuffers =
        caps.maxShaderAtomicCounterBuffers[ShaderType::Fragment];
    mResources.MaxCombinedAtomicCounterBuffers = caps.maxCombinedAtomicCounterBuffers;
    mResources.MaxAtomicCounterBufferSize      = caps.maxAtomicCounterBufferSize;

    mResources.MaxUniformBufferBindings       = caps.maxUniformBufferBindings;
    mResources.MaxShaderStorageBufferBindings = caps.maxShaderStorageBufferBindings;

    // Needed by point size clamping workaround
    mResources.MaxPointSize = caps.maxAliasedPointSize;

    if (state.getClientMajorVersion() == 2 && !extensions.drawBuffers)
    {
        mResources.MaxDrawBuffers = 1;
    }

    // Geometry Shader constants
    mResources.EXT_geometry_shader          = extensions.geometryShader;
    mResources.MaxGeometryUniformComponents = caps.maxShaderUniformComponents[ShaderType::Geometry];
    mResources.MaxGeometryUniformBlocks     = caps.maxShaderUniformBlocks[ShaderType::Geometry];
    mResources.MaxGeometryInputComponents   = caps.maxGeometryInputComponents;
    mResources.MaxGeometryOutputComponents  = caps.maxGeometryOutputComponents;
    mResources.MaxGeometryOutputVertices    = caps.maxGeometryOutputVertices;
    mResources.MaxGeometryTotalOutputComponents = caps.maxGeometryTotalOutputComponents;
    mResources.MaxGeometryTextureImageUnits = caps.maxShaderTextureImageUnits[ShaderType::Geometry];

    mResources.MaxGeometryAtomicCounterBuffers =
        caps.maxShaderAtomicCounterBuffers[ShaderType::Geometry];
    mResources.MaxGeometryAtomicCounters      = caps.maxShaderAtomicCounters[ShaderType::Geometry];
    mResources.MaxGeometryShaderStorageBlocks = caps.maxShaderStorageBlocks[ShaderType::Geometry];
    mResources.MaxGeometryShaderInvocations   = caps.maxGeometryShaderInvocations;
    mResources.MaxGeometryImageUniforms       = caps.maxShaderImageUniforms[ShaderType::Geometry];

    // Subpixel bits.
    mResources.SubPixelBits = static_cast<int>(caps.subPixelBits);
}

Compiler::~Compiler()
{
    for (auto &pool : mPools)
    {
        for (ShCompilerInstance &instance : pool)
        {
            instance.destroy();
        }
    }
    --gActiveCompilers;
    if (gActiveCompilers == 0)
    {
        sh::Finalize();
    }
}

ShCompilerInstance Compiler::getInstance(ShaderType type)
{
    ASSERT(type != ShaderType::InvalidEnum);
    auto &pool = mPools[type];
    if (pool.empty())
    {
        ShHandle handle = sh::ConstructCompiler(ToGLenum(type), mSpec, mOutputType, &mResources);
        ASSERT(handle);
        return ShCompilerInstance(handle, mOutputType, type);
    }
    else
    {
        ShCompilerInstance instance = std::move(pool.back());
        pool.pop_back();
        return instance;
    }
}

void Compiler::putInstance(ShCompilerInstance &&instance)
{
    static constexpr size_t kMaxPoolSize = 32;
    auto &pool                           = mPools[instance.getShaderType()];
    if (pool.size() < kMaxPoolSize)
    {
        pool.push_back(std::move(instance));
    }
    else
    {
        instance.destroy();
    }
}

ShCompilerInstance::ShCompilerInstance() : mHandle(nullptr) {}

ShCompilerInstance::ShCompilerInstance(ShHandle handle,
                                       ShShaderOutput outputType,
                                       ShaderType shaderType)
    : mHandle(handle), mOutputType(outputType), mShaderType(shaderType)
{}

ShCompilerInstance::~ShCompilerInstance()
{
    ASSERT(mHandle == nullptr);
}

void ShCompilerInstance::destroy()
{
    if (mHandle != nullptr)
    {
        sh::Destruct(mHandle);
        mHandle = nullptr;
    }
}

ShCompilerInstance::ShCompilerInstance(ShCompilerInstance &&other)
    : mHandle(other.mHandle), mOutputType(other.mOutputType), mShaderType(other.mShaderType)
{
    other.mHandle = nullptr;
}

ShCompilerInstance &ShCompilerInstance::operator=(ShCompilerInstance &&other)
{
    mHandle       = other.mHandle;
    mOutputType   = other.mOutputType;
    mShaderType   = other.mShaderType;
    other.mHandle = nullptr;
    return *this;
}

ShHandle ShCompilerInstance::getHandle()
{
    return mHandle;
}

ShaderType ShCompilerInstance::getShaderType() const
{
    return mShaderType;
}

const std::string &ShCompilerInstance::getBuiltinResourcesString()
{
    return sh::GetBuiltInResourcesString(mHandle);
}

ShShaderOutput ShCompilerInstance::getShaderOutputType() const
{
    return mOutputType;
}

}  // namespace gl
kc3-lang/angle/src/libANGLE/Compiler.cpp

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kc3-lang/angle /src/libANGLE/Compiler.cpp
