opengl.h

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

/* Include header generated by glad */
#include "SDL_video.h"
#include "glad.h"
 
/* We put all the other opengl stuff here to only have to include one header. */
#include "mat4.h"
#include "opengl_render.h" // IWYU pragma: export
#include "opengl_shader.h" // IWYU pragma: export
#include "opengl_tex.h"    // IWYU pragma: export
#include "opengl_vbo.h"    // IWYU pragma: export
 
#define OPENGL_NUM_FBOS 4 
 
/*
 * Contains info about the opengl screen
 */
#define OPENGL_DOUBLEBUF ( 1 << 1 ) 
#define OPENGL_VSYNC ( 1 << 2 ) 
#define OPENGL_SUBROUTINES                                                     \
   ( 1 << 3 ) 
#define gl_has( f ) ( gl_screen.flags & ( f ) ) 
typedef struct glInfo_ {
   int major; 
   int minor; 
   int glsl;  
   int x;     
   int y;     
   /* Viewport considers x/y offset. */
   int w; 
   int h; 
   /* Scaled window is the effective window resolution without considering
    * offsets. */
   int nw; 
   int nh; 
   /* Real window resolution is the real window resolution, unscaled and without
    * offsets. */
   int           rw;                   
   int           rh;                   
   double        scale;                
   double        wscale;               
   double        hscale;               
   double        dwscale;              
   double        dhscale;              
   double        mxscale;              
   double        myscale;              
   int           depth;                
   int           r;                    
   int           g;                    
   int           b;                    
   int           a;                    
   unsigned int  flags;                
   int           tex_max;              
   int           multitex_max;         
   int           fsaa;                 
   SDL_Window   *window;               
   SDL_GLContext context;              
   GLuint        current_fbo;          
   GLuint        fbo[OPENGL_NUM_FBOS]; 
   GLuint        fbo_tex[OPENGL_NUM_FBOS]; 
   GLuint
      fbo_depth_tex[OPENGL_NUM_FBOS]; 
} glInfo;
extern glInfo gl_screen; /* local structure set with gl_init and co */
 
extern mat4 gl_view_matrix;
 
#define SCREEN_X gl_screen.x 
#define SCREEN_Y gl_screen.y 
#define SCREEN_W gl_screen.w 
#define SCREEN_H gl_screen.h 
 
/*
 * initialization / cleanup
 */
int  gl_init( unsigned int extra_flags );
void gl_exit( void );
void gl_resize( void );
 
/*
 * Extensions and version.
 */
GLboolean gl_hasVersion( int major, int minor );
 
/*
 * Viewport.
 */
void gl_windowToScreenPos( int *sx, int *sy, int wx, int wy );
void gl_screenToWindowPos( int *wx, int *wy, int sx, int sy );
void gl_viewport( int x, int y, int w, int h );
void gl_defViewport( void );
void gl_setDefViewport( int x, int y, int w, int h );
int  gl_setupFullscreen( void );
 
/*
 * misc
 */
void   gl_colourblind( void );
GLenum gl_stringToFilter( const char *s );
GLenum gl_stringToClamp( const char *s );
GLenum gl_stringToBlendFunc( const char *s );
GLenum gl_stringToBlendFactor( const char *s );
void   gl_screenshot( const char *filename );
void   gl_saveFboDepth( GLuint fbo, const char *filename );
#ifdef DEBUGGING
#define gl_checkErr() gl_checkHandleError( __func__, __LINE__ )
int gl_checkHandleError( const char *func, int line );
#else                   /* DEBUGGING */
#define gl_checkErr() 0 
#endif                  /* DEBUGGING */