//**************************************************************
//*            OpenGLide - Glide to OpenGL Wrapper
//*             http://openglide.sourceforge.net
//*
//*                  framebuffer emulation
//*
//*         OpenGLide is OpenSource under LGPL license
//*  Mac version and additional features by Jens-Olaf Hemprich
//**************************************************************

#pragma once

class Framebuffer
{
public:
	Framebuffer();
	~Framebuffer();
/*
	enum Format
	{
		None = -1,
		USHORT_565 = GL_UNSIGNED_SHORT_5_6_5,
		USHORT_5551_REV = GL_UNSIGNED_SHORT_1_5_5_5_REV,
		UBYTE_8888
	};
*/
	static const int MaxTiles = 12;
	struct tilesize {GLint y; GLint x[MaxTiles];};
public:
	bool initialise_buffers(BufferStruct* framebuffer, BufferStruct* texbuffer, FxU32 width, FxU32 height, const tilesize* tilesizetable, bool use_client_storage);
	bool initialise_buffers(BufferStruct* framebuffer, BufferStruct* texbuffer, FxU32 width, FxU32 height, FxU32 x_tile, FxU32 y_tile, bool use_client_storage);
	void free_buffers();
	void initialise_format(GrLfbWriteMode_t format);
	bool begin_write();
	bool end_write();
	bool end_write(FxU32 alpha);
	bool end_write(FxU32 alpha, GLfloat depth, bool pixelpipeline);
	bool end_write_opaque();
protected:
	void Clear();
	bool draw(const tilesize* tilesizetable, bool pixelpipeline);
	void set_gl_state(bool pixelpipeline);
	void restore_gl_state(bool pixelpipeline);
	inline bool createTextureData(FxU32* texbuffer, FxU32 x, FxU32 y, FxU32 x_step, FxU32 y_step);
	inline bool Convert565Kto8888(FxU16* buffer1, FxU32* buffer2, register FxU32 width, register FxU32 height, register FxU32 stride);
	inline bool Convert1555Kto8888(FxU16* buffer1, register FxU32* buffer2, FxU32 register width, register FxU32 height, register FxU32 stride);
	inline bool ConvertARGB8888Kto8888(FxU32* buffer1, register FxU32* buffer2, FxU32 register width, register FxU32 height, register FxU32 stride);
	static const int m_max_client_storage_textures = 256;
	GLuint m_tex_name[m_max_client_storage_textures];
	bool m_use_client_storage;
	bool m_must_clear_buffer;
	GrOriginLocation_t m_origin;
//	GrLfbWriteMode_t m_writemode;
	GLint m_glInternalFormat;
	GLint m_glFormat;
	GLint m_glType;
	FxU16 m_ChromaKey;
	bool m_format_valid;
	BufferStruct* m_framebuffer;
	BufferStruct* m_texbuffer;
//	FxU16* m_framebuffer;
//	void* m_texbuffer;
	FxU32 m_width;
	FxU32 m_height;
	GLint m_x_step_start;
	GLint m_y_step_start;
	GLint m_x_step_start_opaque;
	GLint m_y_step_start_opaque;
	tilesize m_tilesizes[MaxTiles];
	const tilesize* m_custom_tilesizes;
	GLfloat m_glDepth;
	FxU32 m_glAlpha;
	// Pixelpipeline
	bool m_bRestoreColorCombine;
	bool m_bRestoreAlphaCombine;
};