opengl_tex.h

/*
 * See Licensing and Copyright notice in naev.h
 */
#pragma once

#include "SDL_endian.h"
#include "SDL_rwops.h"
#include <stdint.h>
 
#include "attributes.h"
#include "colour.h"
 
/* Recommended for compatibility and such */
#define RMASK SDL_SwapLE32( 0x000000ff ) 
#define GMASK SDL_SwapLE32( 0x0000ff00 ) 
#define BMASK SDL_SwapLE32( 0x00ff0000 ) 
#define AMASK SDL_SwapLE32( 0xff000000 ) 
#define RGBAMASK RMASK, GMASK, BMASK, AMASK
 
/*
 * Texture flags.
 */
#define OPENGL_TEX_MAPTRANS ( 1 << 0 ) 
#define OPENGL_TEX_MIPMAPS ( 1 << 1 )  
#define OPENGL_TEX_VFLIP                                                       \
   ( 1 << 2 ) 
#define OPENGL_TEX_SKIPCACHE                                                   \
   ( 1 << 3 ) 
#define OPENGL_TEX_SDF                                                         \
   ( 1 << 4 ) 
#define OPENGL_TEX_CLAMP_ALPHA                                                 \
   ( 1 << 5 ) 
#define OPENGL_TEX_NOTSRGB ( 1 << 6 ) 

typedef struct glTexture_ {
   char *name; 
 
   /* dimensions */
   double w; 
   double h; 
 
   /* sprites */
   double sx;  
   double sy;  
   double sw;  
   double sh;  
   double srw; 
   double srh; 
 
   /* data */
   GLuint   texture; 
   uint8_t *trans;   
   double   vmax;    
 
   /* properties */
   uint8_t flags; 
} glTexture;
 
/*
 * Init/exit.
 */
int  gl_initTextures( void );
void gl_exitTextures( void );
 
/*
 * Creating.
 */
USE_RESULT glTexture *gl_texExistsOrCreate( const char  *path,
                                            unsigned int flags, int sx, int sy,
                                            int *created );
USE_RESULT glTexture *gl_loadImageData( float *data, int w, int h, int sx,
                                        int sy, const char *name );
USE_RESULT glTexture *gl_newImage( const char *path, const unsigned int flags );
USE_RESULT glTexture                       *
gl_newImageRWops( const char *path, SDL_RWops *rw,
                                        const unsigned int flags ); /* Does not close the RWops. */
USE_RESULT glTexture *gl_newSprite( const char *path, const int sx,
                                    const int sy, const unsigned int flags );
USE_RESULT glTexture *gl_newSpriteRWops( const char *path, SDL_RWops *rw,
                                         const int sx, const int sy,
                                         const unsigned int flags );
USE_RESULT glTexture *gl_dupTexture( const glTexture *texture );
USE_RESULT glTexture *gl_rawTexture( const char *name, GLuint tex, double w,
                                     double h );
 
/*
 * Clean up.
 */
void gl_freeTexture( glTexture *texture );
 
/*
 * FBO stuff.
 */
int gl_fboCreate( GLuint *fbo, GLuint *tex, GLsizei width, GLsizei height );
int gl_fboAddDepth( GLuint fbo, GLuint *tex, GLsizei width, GLsizei height );
 
/*
 * Misc.
 */
void        gl_contextSet( void );
void        gl_contextUnset( void );
int         gl_isTrans( const glTexture *t, const int x, const int y );
void        gl_getSpriteFromDir( int *x, int *y, int sx, int sy, double dir );
glTexture **gl_copyTexArray( glTexture **tex );
glTexture **gl_addTexArray( glTexture **tex, glTexture *t );