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/* 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.
*
*/
#ifndef BACKENDS_GRAPHICS_OPENGL_TEXTURE_H
#define BACKENDS_GRAPHICS_OPENGL_TEXTURE_H
#include "backends/graphics/opengl/opengl-sys.h"
#include "graphics/pixelformat.h"
#include "graphics/surface.h"
#include "common/rect.h"
namespace OpenGL {
/**
* An OpenGL texture wrapper. It automatically takes care of all OpenGL
* texture handling issues and also provides access to the texture data.
*/
class Texture {
public:
/**
* Create a new texture with the specific internal format.
*
* @param glIntFormat The internal format to use.
* @param glFormat The input format.
* @param glType The input type.
* @param format The format used for the texture input.
*/
Texture(GLenum glIntFormat, GLenum glFormat, GLenum glType, const Graphics::PixelFormat &format);
virtual ~Texture();
/**
* Destroy the OpenGL texture name.
*/
void releaseInternalTexture();
/**
* Create the OpenGL texture name and flag the whole texture as dirty.
*/
void recreateInternalTexture();
/**
* Enable or disable linear texture filtering.
*
* @param enable true to enable and false to disable.
*/
void enableLinearFiltering(bool enable);
/**
* Allocate texture space for the desired dimensions. This wraps any
* handling of requirements for POT textures.
*
* @param width The desired logical width.
* @param height The desired logical height.
*/
virtual void allocate(uint width, uint height);
void copyRectToTexture(uint x, uint y, uint w, uint h, const void *src, uint srcPitch);
void fill(uint32 color);
void draw(GLfloat x, GLfloat y, GLfloat w, GLfloat h);
void flagDirty() { _allDirty = true; }
bool isDirty() const { return _allDirty || !_dirtyArea.isEmpty(); }
uint getWidth() const { return _userPixelData.w; }
uint getHeight() const { return _userPixelData.h; }
/**
* @return The hardware format of the texture data.
*/
const Graphics::PixelFormat &getHardwareFormat() const { return _format; }
/**
* @return The logical format of the texture data.
*/
virtual Graphics::PixelFormat getFormat() const { return _format; }
virtual Graphics::Surface *getSurface() { return &_userPixelData; }
virtual const Graphics::Surface *getSurface() const { return &_userPixelData; }
/**
* @return Whether the texture data is using a palette.
*/
virtual bool hasPalette() const { return false; }
virtual void setPalette(uint start, uint colors, const byte *palData) {}
virtual void *getPalette() { return 0; }
virtual const void *getPalette() const { return 0; }
/**
* Query texture related OpenGL information from the context. This only
* queries the maximum texture size for now.
*/
static void queryTextureInformation();
/**
* @return Return the maximum texture dimensions supported.
*/
static GLint getMaximumTextureSize() { return _maxTextureSize; }
protected:
virtual void updateTexture();
Common::Rect getDirtyArea() const;
private:
const GLenum _glIntFormat;
const GLenum _glFormat;
const GLenum _glType;
const Graphics::PixelFormat _format;
GLint _glFilter;
GLuint _glTexture;
Graphics::Surface _textureData;
Graphics::Surface _userPixelData;
bool _allDirty;
Common::Rect _dirtyArea;
void clearDirty() { _allDirty = false; _dirtyArea = Common::Rect(); }
static GLint _maxTextureSize;
};
class TextureCLUT8 : public Texture {
public:
TextureCLUT8(GLenum glIntFormat, GLenum glFormat, GLenum glType, const Graphics::PixelFormat &format);
virtual ~TextureCLUT8();
virtual void allocate(uint width, uint height);
virtual Graphics::PixelFormat getFormat() const;
virtual bool hasPalette() const { return true; }
virtual void setPalette(uint start, uint colors, const byte *palData);
virtual void *getPalette() { return _palette; }
virtual const void *getPalette() const { return _palette; }
virtual Graphics::Surface *getSurface() { return &_clut8Data; }
virtual const Graphics::Surface *getSurface() const { return &_clut8Data; }
protected:
virtual void updateTexture();
private:
Graphics::Surface _clut8Data;
byte *_palette;
};
} // End of namespace OpenGL
#endif
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