Program Listing for File opengl-features.h

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(c) Intel Corporation.

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and your use of them is governed by the express license under which they
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#pragma once

#include "opengl-version.h"

#include <bitset>
#include <set>
#include <string>

struct GPADispatchTable;

namespace gpa {
namespace gpu_utility {

enum class GLFeature : size_t {
    kVertexArrayObject,
    kVertexArrayOjectApple,
    kDrawBuffers,
    kDrawBuffersIndexedExt,
    kDrawBuffersBlendEquations,
    kDrawBuffersBlendMaskEnable,
    kBlendEquation,
    kSamplerObject,
    kPixelBufferObject,
    kPackSubImage,
    kUnpackSubImage,
    kTexture3D,
    kViewportArray,
    kAppleRowBytes,
    kFramebufferBlit,

    kCount  // Keep it at the end
};

// NOTE: GLFeatures is not thread safe!
// Methods of the single GLFeatures object should be called from the single thread (on per-context basis)
class GLFeatures
{
public:
    explicit GLFeatures(const GPADispatchTable& dispatchTable);

    GLFeatures(const GLFeatures&) = delete;
    GLFeatures& operator=(const GLFeatures&) = delete;

    GLFeatures(GLFeatures&&) noexcept = delete;
    GLFeatures& operator=(GLFeatures&&) noexcept = delete;

    bool IsAvailable(GLFeature feature) const
    {
        return mFeatureFlags[static_cast<size_t>(feature)];
    }

    void Update(const GLVersion::Desc& versionDesc);

private:
    void UpdateWithVersion(const GLVersion::Desc& versionDesc);
    void UpdateWithExtensions();

    std::set<std::string> GetCurrentExtensions(const GLVersion::Desc& versionDesc) const;

    const GPADispatchTable& mDispatchTable;
    std::bitset<static_cast<size_t>(GLFeature::kCount)> mFeatureFlags;
    std::set<std::string> mExtensions;
    GLVersion::Desc mVersionDesc;
};

}  // namespace gpu_utility
}  // namespace gpa