scummvm/backends/platform/android/texture.h

/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.

 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.

 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * $URL$
 * $Id$
 *
 */

#ifndef _ANDROID_TEXTURE_H_
#define _ANDROID_TEXTURE_H_

#if defined(__ANDROID__)

#include <GLES/gl.h>

#include "graphics/surface.h"

#include "common/rect.h"
#include "common/array.h"

class GLESTexture {
public:
	static void initGLExtensions();

	GLESTexture();
	virtual ~GLESTexture();

	virtual void reinitGL();
	virtual void allocBuffer(GLuint width, GLuint height);

	virtual void updateBuffer(GLuint x, GLuint y, GLuint width, GLuint height,
								const void *buf, int pitch);
	virtual void fillBuffer(byte x);

	virtual void drawTexture(GLshort x, GLshort y, GLshort w, GLshort h);

	inline GLuint width() const {
		return _surface.w;
	}

	inline GLuint height() const {
		return _surface.h;
	}

	inline const Graphics::Surface *surface_const() const {
		return &_surface;
	}

	inline Graphics::Surface *surface() {
		setDirty();
		return &_surface;
	}

	inline bool dirty() const {
		return _all_dirty || !_dirty_rect.isEmpty();
	}

	inline void drawTexture() {
		drawTexture(0, 0, _surface.w, _surface.h);
	}

protected:
	virtual byte bytesPerPixel() const = 0;
	virtual GLenum glFormat() const = 0;
	virtual GLenum glType() const = 0;

	virtual size_t paletteSize() const {
		return 0;
	}

	inline void setDirty() {
		_all_dirty = true;
		_dirty_rect = Common::Rect();
	}

	inline void setDirtyRect(const Common::Rect& r) {
		if (!_all_dirty) {
			if (_dirty_rect.isEmpty())
				_dirty_rect = r;
			else
				_dirty_rect.extend(r);
		}
	}

	GLuint _texture_name;
	Graphics::Surface _surface;
	GLuint _texture_width;
	GLuint _texture_height;
	bool _all_dirty;

	// Covers dirty area
	Common::Rect _dirty_rect;
};

// RGBA4444 texture
class GLES4444Texture : public GLESTexture {
protected:
	virtual byte bytesPerPixel() const {
		return 2;
	}

	virtual GLenum glFormat() const {
		return GL_RGBA;
	}

	virtual GLenum glType() const {
		return GL_UNSIGNED_SHORT_4_4_4_4;
	}
};

// RGB565 texture
class GLES565Texture : public GLESTexture {
protected:
	virtual byte bytesPerPixel() const {
		return 2;
	}

	virtual GLenum glFormat() const {
		return GL_RGB;
	}

	virtual GLenum glType() const {
		return GL_UNSIGNED_SHORT_5_6_5;
	}
};

// RGB888 256-entry paletted texture
class GLESPaletteTexture : public GLESTexture {
public:
	GLESPaletteTexture();
	virtual ~GLESPaletteTexture();

	virtual void allocBuffer(GLuint width, GLuint height);
	virtual void updateBuffer(GLuint x, GLuint y, GLuint width, GLuint height,
								const void *buf, int pitch);
	virtual void fillBuffer(byte x);

	virtual void drawTexture(GLshort x, GLshort y, GLshort w, GLshort h);

	inline void drawTexture() {
		drawTexture(0, 0, _surface.w, _surface.h);
	}

	inline const byte *palette_const() const {
		return _texture;
	};

	inline byte *palette() {
		setDirty();
		return _texture;
	};

protected:
	virtual byte bytesPerPixel() const {
		return 1;
	}

	virtual GLenum glFormat() const {
		return GL_RGB;
	}

	virtual GLenum glType() const {
		return GL_PALETTE8_RGB8_OES;
	}

	virtual size_t paletteSize() const {
		return 256 * 3;
	}

	void uploadTexture() const;

	byte *_texture;
};

// RGBA8888 256-entry paletted texture
class GLESPaletteATexture : public GLESPaletteTexture {
protected:
	virtual GLenum glFormat() const {
		return GL_RGBA;
	}

	virtual GLenum glType() const {
		return GL_PALETTE8_RGBA8_OES;
	}

	virtual size_t paletteSize() const {
		return 256 * 4;
	}
};

#endif
#endif