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#include "../include/mgl/window.h"
#include "../include/mgl/mgl.h"
#include <X11/Xutil.h>
#include <errno.h>
#include <stdio.h>
/* TODO: check for glx swap control extension string (GLX_EXT_swap_control, etc) */
static void set_vertical_sync_enabled(Window window, int enabled) {
int result = 0;
mgl_context *context = mgl_get_context();
if(context->gl.glXSwapIntervalEXT) {
context->gl.glXSwapIntervalEXT(context->connection, window, enabled ? 1 : 0);
} else if(context->gl.glXSwapIntervalMESA) {
result = context->gl.glXSwapIntervalMESA(enabled ? 1 : 0);
} else if(context->gl.glXSwapIntervalSGI) {
result = context->gl.glXSwapIntervalSGI(enabled ? 1 : 0);
} else {
static int warned = 0;
if (!warned) {
warned = 1;
fprintf(stderr, "Warning: setting vertical sync not supported\n");
}
}
if(result != 0)
fprintf(stderr, "Warning: setting vertical sync failed\n");
}
static void mgl_window_on_resize(mgl_window *self, int width, int height) {
mgl_context *context = mgl_get_context();
self->width = width;
self->height = height;
context->gl.glViewport(0, 0, self->width, self->height);
context->gl.glMatrixMode(GL_PROJECTION);
context->gl.glLoadIdentity();
context->gl.glOrtho(0.0, width, height, 0.0, -1.0, 1.0);
}
int mgl_window_create(mgl_window *self, const char *title, int width, int height, mgl_window_callback *callback) {
return mgl_window_create_with_params(self, title, width, height, DefaultRootWindow(mgl_get_context()->connection), callback);
}
int mgl_window_create_with_params(mgl_window *self, const char *title, int width, int height, unsigned long parent_window, mgl_window_callback *callback) {
self->window = 0;
self->callback = *callback;
mgl_context *context = mgl_get_context();
Colormap color_map = XCreateColormap(context->connection, DefaultRootWindow(context->connection), ((XVisualInfo*)context->visual_info)->visual, AllocNone);
if(!color_map) {
fprintf(stderr, "XCreateColormap failed\n");
return -1;
}
XSetWindowAttributes window_attr;
window_attr.colormap = color_map;
window_attr.event_mask = KeyPressMask | StructureNotifyMask;
self->window = XCreateWindow(context->connection, parent_window, 0, 0, width, height, 0, ((XVisualInfo*)context->visual_info)->depth, InputOutput, ((XVisualInfo*)context->visual_info)->visual, CWColormap | CWEventMask, &window_attr);
XFreeColormap(context->connection, color_map);
if(!self->window) {
fprintf(stderr, "XCreateWindow failed\n");
mgl_window_deinit(self);
return -1;
}
/* TODO: Test utf8 */
XStoreName(context->connection, self->window, title);
XMapWindow(context->connection, self->window);
XFlush(context->connection);
/* TODO: Switch current when rendering to another window, and set current to NULL when destroying the currently selected context */
context->gl.glXMakeCurrent(context->connection, self->window, context->glx_context);
set_vertical_sync_enabled(self->window, 1);
context->gl.glEnable(GL_TEXTURE_2D);
context->gl.glEnable(GL_BLEND);
context->gl.glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
XWindowAttributes gwa;
gwa.width = 0;
gwa.height = 0;
XGetWindowAttributes(context->connection, self->window, &gwa);
mgl_window_on_resize(self, gwa.width, gwa.height);
mgl_window_draw(self);
return 0;
}
void mgl_window_deinit(mgl_window *self) {
mgl_context *context = mgl_get_context();
if(self->window) {
XDestroyWindow(context->connection, self->window);
self->window = 0;
}
}
static void on_receive_x11_event(mgl_window *window, XEvent *xev) {
if(xev->type == ConfigureNotify) {
if(xev->xconfigure.width != window->width || xev->xconfigure.height != window->height) {
mgl_window_on_resize(window, xev->xconfigure.width, xev->xconfigure.height);
/*fprintf(stderr, "resize!\n");*/
}
}
}
void mgl_window_events_poll(mgl_window *self) {
Display *display = mgl_get_context()->connection;
const int x11_fd = ConnectionNumber(display);
fd_set in_fds;
FD_ZERO(&in_fds); /* TODO: Optimize */
FD_SET(x11_fd, &in_fds);
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
/*tv.tv_sec = timeout_ms / 1000;
tv.tv_usec = (timeout_ms * 1000) - (tv.tv_sec * 1000 * 1000);*/
/* TODO: Is this needed when using XPending? */
const int num_ready_fds = select(1 + x11_fd, &in_fds, NULL, NULL, &tv);
if(num_ready_fds > 0) {
XEvent xev;
while(XPending(display)) {
XNextEvent(display, &xev);
on_receive_x11_event(self, &xev);
}
} else if(num_ready_fds == -1 && errno != EINTR) {
/* TODO: */
fprintf(stderr, "Disconnected!\n");
}
}
void mgl_window_draw(mgl_window *self) {
mgl_context *context = mgl_get_context();
context->gl.glClear(GL_COLOR_BUFFER_BIT);
context->gl.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
if(self->callback.draw)
self->callback.draw(self, self->callback.userdata);
context->gl.glXSwapBuffers(context->connection, self->window);
}
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