#ifndef GSR_EGL_H
#define GSR_EGL_H

/* OpenGL EGL library with a hidden window context (to allow using the opengl functions) */

#include <X11/X.h>
#include <X11/Xutil.h>
#include <stdbool.h>
#include <stdint.h>

typedef void* EGLDisplay;
typedef void* EGLSurface;
typedef void* EGLContext;
typedef void* EGLConfig;
typedef void* EGLNativeDisplayType;
typedef uintptr_t EGLNativeWindowType;

#define EGL_BUFFER_SIZE                         0x3020
#define EGL_RENDERABLE_TYPE                     0x3040
#define EGL_OPENGL_ES2_BIT                      0x0004
#define EGL_NONE                                0x3038
#define EGL_CONTEXT_CLIENT_VERSION              0x3098

#define GL_VENDOR                               0x1F00
#define GL_RENDERER                             0x1F01

typedef struct {
    void *egl_library;
    void *gl_library;
    Display *dpy;
    EGLDisplay egl_display;
    EGLSurface egl_surface;
    EGLContext egl_context;
    Window window;

    EGLDisplay (*eglGetDisplay)(EGLNativeDisplayType display_id);
    unsigned int (*eglInitialize)(EGLDisplay dpy, int32_t *major, int32_t *minor);
    unsigned int (*eglTerminate)(EGLDisplay dpy);
    unsigned int (*eglChooseConfig)(EGLDisplay dpy, const int32_t *attrib_list, EGLConfig *configs, int32_t config_size, int32_t *num_config);
    EGLSurface (*eglCreateWindowSurface)(EGLDisplay dpy, EGLConfig config, EGLNativeWindowType win, const int32_t *attrib_list);
    EGLContext (*eglCreateContext)(EGLDisplay dpy, EGLConfig config, EGLContext share_context, const int32_t *attrib_list);
    unsigned int (*eglMakeCurrent)(EGLDisplay dpy, EGLSurface draw, EGLSurface read, EGLContext ctx);
    unsigned int (*eglDestroyContext)(EGLDisplay dpy, EGLContext ctx);
    unsigned int (*eglDestroySurface)(EGLDisplay dpy, EGLSurface surface);

    const unsigned char* (*glGetString)(unsigned int name);
} gsr_egl;

bool gsr_egl_load(gsr_egl *self, Display *dpy);
void gsr_egl_unload(gsr_egl *self);

#endif /* GSR_EGL_H */