opengl.h

/*
**  UICore
**  Copyright (c) 1997-2015 The UICore Team
**
**  This software is provided 'as-is', without any express or implied
**  warranty.  In no event will the authors be held liable for any damages
**  arising from the use of this software.
**
**  Permission is granted to anyone to use this software for any purpose,
**  including commercial applications, and to alter it and redistribute it
**  freely, subject to the following restrictions:
**
**  1. The origin of this software must not be misrepresented; you must not
**     claim that you wrote the original software. If you use this software
**     in a product, an acknowledgment in the product documentation would be
**     appreciated but is not required.
**  2. Altered source versions must be plainly marked as such, and must not be
**     misrepresented as being the original software.
**  3. This notice may not be removed or altered from any source distribution.
**
**  Note: Some of the libraries UICore may link to may have additional
**  requirements or restrictions.
**
**  File Author(s):
**
**    Magnus Norddahl
*/


#pragma once

#include "opengl_defines.h"
#include <utility>
#include <string>
#include "../Display/Render/texture.h"

#if defined(_MSC_VER)
#define cl_tls_variable _declspec(thread)
#elif defined(__APPLE__) // To do: change check to only apply to iOS/ARM target
#define cl_tls_variable
#else
#define cl_tls_variable __thread
#endif

namespace uicore
{
    class GLFunctions;
    class GraphicContext;
    class OpenGLContextProvider;
    class GL1GraphicContext;
    class GL3GraphicContext;

    enum TextureFormat;

    typedef void (ProcAddress)();

    typedef struct
    {
        TextureFormat texture_format;
        bool valid;     
        GLint internal_format;
        GLenum pixel_format;
        GLenum pixel_datatype;
    } TextureFormat_GL;

    typedef struct
    {
        GLenum source;
        GLenum type;
        GLenum severity;
        GLuint id;
        std::string message;

    } MessageLog_GL;

    class OpenGL
    {
    public:
        static ProcAddress *get_proc_address(const std::string &function_name);

        static cl_tls_variable GLFunctions *functions;

        static TextureFormat_GL textureformat(TextureFormat format);

        static void set_active(const GraphicContextPtr &gc);

        static void set_active(const OpenGLContextProvider * const gc_provider);

        static bool set_active();

        static void check_error();

        static std::vector<MessageLog_GL> get_message_log(GLuint numMsgs);

        static GLuint get_texture_handle(const TexturePtr &texture);

        static GLenum to_enum(DrawBuffer buf);
        static GLenum to_enum(CompareFunction func);
        static GLenum to_enum(StencilOp op);
        static GLenum to_enum(CullMode mode);
        static GLenum to_enum(FillMode mode);
        static GLenum to_enum(BlendFunc func);
        static GLenum to_enum(BlendEquation eq);
        static GLenum to_enum(VertexAttributeDataType value);
        static GLenum to_enum(PrimitivesType value);
        static GLenum to_enum(LogicOp op);
        static GLenum to_enum(TextureFilter filter);
        static GLenum to_enum(TextureWrapMode mode);
        static GLenum to_enum(TextureCompareMode mode);
        static GLenum to_cube_target(int index);
        static GLenum to_enum(BufferUsage usage);
        static GLenum to_enum(BufferAccess access);

    private:
        static void remove_active(const OpenGLContextProvider * const gc_provider);

        friend class GL1GraphicContext;
        friend class GL3GraphicContext;
        friend class PBuffer_GL1_Impl;
    };
}