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#include "../include/mgl/mgl.h"
#include <X11/Xutil.h>
#include <stdio.h>
#ifndef NDEBUG
#include <stdlib.h>
#endif
static mgl_context context;
static int init_count = 0;
static XErrorHandler prev_xerror = NULL;
static int ignore_xerror(Display *display, XErrorEvent *ee) {
(void)display;
(void)ee;
return 0;
}
static int glx_context_init() {
const int attr[] = {
GLX_RGBA,
GLX_BUFFER_SIZE, 24,
GLX_DEPTH_SIZE, 0,
GLX_STENCIL_SIZE, 0,
GLX_RED_SIZE, 8,
GLX_GREEN_SIZE, 8,
GLX_BLUE_SIZE, 8,
GLX_ALPHA_SIZE, 0,
GLX_ACCUM_RED_SIZE, 0,
GLX_ACCUM_GREEN_SIZE, 0,
GLX_ACCUM_BLUE_SIZE, 0,
GLX_ACCUM_ALPHA_SIZE, 0,
GLX_DOUBLEBUFFER, /* TODO: Add option to turn this off? */
None
};
context.visual_info = context.gl.glXChooseVisual(context.connection, DefaultScreen(context.connection), (int*)attr);
if(!context.visual_info) {
fprintf(stderr, "glXChooseVisual failed, no appropriate visual found\n");
return -1;
}
context.glx_context = context.gl.glXCreateContext(context.connection, context.visual_info, NULL, 1);
if(!context.glx_context) {
fprintf(stderr, "glXCreateContext failed\n");
return -1;
}
return 0;
}
static void glx_context_deinit() {
if(context.glx_context) {
context.gl.glXDestroyContext(context.connection, context.glx_context);
context.glx_context = NULL;
}
if(context.visual_info) {
XFree(context.visual_info);
context.visual_info = NULL;
}
}
int mgl_init(void) {
++init_count;
if(init_count == 1) {
context.connection = XOpenDisplay(NULL);
if(!context.connection) {
fprintf(stderr, "XOpenDisplay(NULL) failed\n");
mgl_deinit();
return -1;
}
prev_xerror = XSetErrorHandler(ignore_xerror);
if(mgl_gl_load(&context.gl) != 0) {
mgl_deinit();
return -1;
}
if(glx_context_init() != 0) {
mgl_deinit();
return -1;
}
}
return 0;
}
void mgl_deinit(void) {
if(init_count == 1) {
glx_context_deinit();
mgl_gl_unload(&context.gl);
XSetErrorHandler(prev_xerror);
if(context.connection) {
XCloseDisplay(context.connection);
context.connection = NULL;
}
}
if(init_count > 0)
--init_count;
}
mgl_context* mgl_get_context(void) {
#ifndef NDEBUG
if(init_count == 0) {
fprintf(stderr, "Error: mgl_get_context was called before mgl_init\n");
abort();
}
#endif
return &context;
}
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