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/* bzflag
* Copyright (c) 1993-2025 Tim Riker
*
* This package is free software; you can redistribute it and/or
* modify it under the terms of the license found in the file
* named COPYING that should have accompanied this file.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/* OpenGLTexture:
* Encapsulates an OpenGL texture.
*
* Data must be in GL_RGBA format with type GL_UNSIGNED_BYTE.
* If, for all pixels, the RGB components are equal, then
* the data will be transformed to GL_LUMINANCE_ALPHA. If,
* for all pixels, the alpha component is opaque, then the
* data will be transformed to GL_LUMINANCE or GL_RGB.
* hasAlpha() will return true iff the alpha component was
* kept.
*
* OpenGLTexture reference counts so copying or assigning a
* texture keeps the same display list until the object is
* changed.
*
* A default constructed texture is invalid. The only way to
* make such an object valid is to assign a valid texture to it.
* Drawing an invalid texture has no effect.
*
* operator==() returns true iff the two objects refer to the
* same display list. operator!=() returns true iff the two
* objects do not refer to the same display list. Textures
* that don't refer to the same display list but have exactly
* the same texture map compare not-equal.
*
* <, <=, >, >= define an arbitrary ordering of textures.
*/
#ifndef BZF_OPENGL_TEXTURE_H
#define BZF_OPENGL_TEXTURE_H
#include "common.h"
#include <string>
#include "bzfgl.h"
class OpenGLTexture
{
public:
enum Filter
{
Off,
Nearest,
Linear,
NearestMipmapNearest,
LinearMipmapNearest,
NearestMipmapLinear,
LinearMipmapLinear,
Max = LinearMipmapLinear,
Default = Max
};
OpenGLTexture(int width, int height,
const GLvoid* pixels,
Filter maxFilter = Linear,
bool repeat = true);
~OpenGLTexture();
bool hasAlpha() const;
void execute();
float getAspectRatio() const;
int getWidth() const;
int getHeight() const;
Filter getFilter();
void setFilter(Filter);
void freeContext();
void initContext();
static int getFilterCount();
static const char* getFilterName(Filter id);
static const char** getFilterNames();
static Filter getMaxFilter();
static void setMaxFilter(Filter);
private:
OpenGLTexture(const OpenGLTexture&);
OpenGLTexture& operator=(const OpenGLTexture&);
bool operator==(const OpenGLTexture&) const;
bool operator!=(const OpenGLTexture&) const;
bool operator<(const OpenGLTexture&) const;
void getBestFormat();
void bind();
void setupImage(const GLubyte* pixels);
void* operator new(size_t s)
{
return ::operator new(s);
}
void operator delete(void *p)
{
::operator delete(p);
}
bool alpha;
const int width;
const int height;
GLint scaledWidth;
GLint scaledHeight;
GLubyte* image;
GLubyte* imageMemory;
bool repeat;
int internalFormat;
GLuint list;
Filter filter;
static Filter maxFilter;
static const int filterCount;
static const char* configFilterNames[];
static const GLenum minifyFilter[];
static const GLenum magnifyFilter[];
static void static_freeContext(void *that);
static void static_initContext(void *that);
friend class TextureManager;
};
//
// OpenGLTexture
//
inline bool OpenGLTexture::hasAlpha() const
{
return alpha;
}
inline int OpenGLTexture::getWidth() const
{
return width;
}
inline int OpenGLTexture::getHeight() const
{
return height;
}
#endif // BZF_OPENGL_TEXTURE_H
// Local Variables: ***
// mode: C++ ***
// tab-width: 4 ***
// c-basic-offset: 4 ***
// indent-tabs-mode: nil ***
// End: ***
// ex: shiftwidth=4 tabstop=4
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