From 54b2376adad98d91d32378efc3f241f120ba970f Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sun, 10 Oct 2021 13:56:10 +0200
Subject: Draw every frame instead of x11 expose, enable vsync (if available)

---
 src/window.c | 63 +++++++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 43 insertions(+), 20 deletions(-)

(limited to 'src/window.c')

diff --git a/src/window.c b/src/window.c
index 9836907..bdbcd6f 100644
--- a/src/window.c
+++ b/src/window.c
@@ -24,7 +24,7 @@ int mgl_window_create_with_params(mgl_window *self, const char *title, int width
 
     XSetWindowAttributes window_attr;
     window_attr.colormap = color_map;
-    window_attr.event_mask = ExposureMask | KeyPressMask;
+    window_attr.event_mask = KeyPressMask;
 
     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);
@@ -48,19 +48,27 @@ void mgl_window_deinit(mgl_window *self) {
     }
 }
 
-static void mgl_window_draw(mgl_window *self) {
+/* 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();
 
-    /* TODO: Get window size from window resize event instead */
-    XWindowAttributes gwa;
-    XGetWindowAttributes(context->connection, self->window, &gwa);
+    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");
+        }
+    }
 
-    context->gl.glViewport(0, 0, gwa.width, gwa.height);
-    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->glx.glXSwapBuffers(context->connection, self->window);
+    if(result != 0)
+        fprintf(stderr, "Warning: setting vertical sync failed\n");
 }
 
 void mgl_window_show(mgl_window *self) {
@@ -70,19 +78,16 @@ void mgl_window_show(mgl_window *self) {
     XFlush(context->connection);
 
     /* TODO: Switch current when rendering to another window, and set current to NULL when destroying the currently selected context */
-    context->glx.glXMakeCurrent(context->connection, self->window, context->glx_context);
+    context->gl.glXMakeCurrent(context->connection, self->window, context->glx_context);
+    set_vertical_sync_enabled(self->window, 1);
     mgl_window_draw(self);
 }
 
 static void on_receive_x11_event(mgl_window *window, XEvent *xev) {
-    switch(xev->type) {
-        case Expose:
-            mgl_window_draw(window);
-            break;
-    }
+    
 }
 
-void mgl_window_event_poll(mgl_window *self, int timeout_ms) {
+void mgl_window_event_poll(mgl_window *self) {
     Display *display = mgl_get_context()->connection;
     const int x11_fd = ConnectionNumber(display);
 
@@ -91,9 +96,12 @@ void mgl_window_event_poll(mgl_window *self, int timeout_ms) {
     FD_SET(x11_fd, &in_fds);
 
     struct timeval tv;
-    tv.tv_sec = timeout_ms / 1000;
-    tv.tv_usec = (timeout_ms * 1000) - (tv.tv_sec * 1000 * 1000);
+    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;
@@ -103,3 +111,18 @@ void mgl_window_event_poll(mgl_window *self, int timeout_ms) {
         }
     }
 }
+
+void mgl_window_draw(mgl_window *self) {
+    mgl_context *context = mgl_get_context();
+
+    /* TODO: Get window size from window resize event instead */
+    XWindowAttributes gwa;
+    XGetWindowAttributes(context->connection, self->window, &gwa);
+
+    context->gl.glViewport(0, 0, gwa.width, gwa.height);
+    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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