generator/templates/opengl/OpenGLFunctionsBase.h

//* Copyright 2019 The Dawn & Tint Authors
//*
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//* modification, are permitted provided that the following conditions are met:
//*
//* 1. Redistributions of source code must retain the above copyright notice, this
//*    list of conditions and the following disclaimer.
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//* 2. Redistributions in binary form must reproduce the above copyright notice,
//*    this list of conditions and the following disclaimer in the documentation
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#ifndef DAWNNATIVE_OPENGL_OPENGLFUNCTIONSBASE_H_
#define DAWNNATIVE_OPENGL_OPENGLFUNCTIONSBASE_H_

#include <unordered_set>

#include "dawn/native/Error.h"
#include "dawn/native/opengl/opengl_platform.h"

namespace dawn::native::opengl {
    using GetProcAddress = void* (*) (const char*);

    struct OpenGLFunctionsBase {
      public:
        {% for block in header_blocks %}
            // {{block.description}}
            {% for proc in block.procs %}
                {{proc.PFNGLPROCNAME()}} {{proc.ProcName()}} = nullptr;
            {% endfor %}

        {% endfor%}

        // GL_ANGLE_base_vertex_base_instance
        // See crbug.com/dawn/1715 for why this is embedded
        PFNGLDRAWARRAYSINSTANCEDBASEINSTANCEANGLEPROC DrawArraysInstancedBaseInstanceANGLE = nullptr;
        PFNGLDRAWELEMENTSINSTANCEDBASEVERTEXBASEINSTANCEANGLEPROC DrawElementsInstancedBaseVertexBaseInstanceANGLE = nullptr;
        PFNGLMULTIDRAWARRAYSINSTANCEDBASEINSTANCEANGLEPROC MultiDrawArraysInstancedBaseInstanceANGLE = nullptr;
        PFNGLMULTIDRAWELEMENTSINSTANCEDBASEVERTEXBASEINSTANCEANGLEPROC MultiDrawElementsInstancedBaseVertexBaseInstanceANGLE = nullptr;

        bool IsGLExtensionSupported(const char* extension) const;

      protected:
        MaybeError LoadDesktopGLProcs(GetProcAddress getProc, int majorVersion, int minorVersion);
        MaybeError LoadOpenGLESProcs(GetProcAddress getProc, int majorVersion, int minorVersion);

      private:
        template<typename T>
        MaybeError LoadProc(GetProcAddress getProc, T* memberProc, const char* name);
        void InitializeSupportedGLExtensions();

        std::unordered_set<std::string> mSupportedGLExtensionsSet;
    };

}  // namespace dawn::native::opengl

#endif // DAWNNATIVE_OPENGL_OPENGLFUNCTIONSBASE_H_