1 files changed, 88 insertions, 0 deletions
diff --git a/src/main/ui/x11/ui.c b/src/main/ui/x11/ui.c
new file mode 100644
index 0000000..349f49c
--- /dev/null
+++ b/src/main/ui/x11/ui.c
@@ -0,0 +1,88 @@
+/*-
+ * This file is part of Tris Game.
+ *
+ * Tris Game is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Tris Game is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Tris Game.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <GL/gl.h>
+#include <GL/glx.h>
+#include <X11/Xlib.h>
+
+static Display *display;
+static Window window;
+static GLXContext gl_context;
+
+void cleanup(void);
+
+void
+ui_init()
+{
+	display = XOpenDisplay(NULL);
+	if (!display) {
+		fprintf(stderr, "Error: Can't open X11 display\n");
+		exit(1);
+	}
+
+	int screen = DefaultScreen(display);
+	Window root = RootWindow(display, screen);
+
+	GLint attribs[] = { GLX_RGBA, GLX_DEPTH_SIZE, 24, GLX_DOUBLEBUFFER, None };
+	XVisualInfo *vi = glXChooseVisual(display, screen, attribs);
+
+	if (!vi) {
+		fprintf(stderr, "Error: No compatible Visual found\n");
+		exit(1);
+	}
+
+	Colormap colormap = XCreateColormap(display, root, vi->visual, AllocNone);
+	XSetWindowAttributes swa;
+	swa.colormap = colormap;
+	swa.event_mask = ExposureMask | KeyPressMask;
+
+	window = XCreateWindow(display, root, 0, 0, 640, 480, 0, vi->depth, InputOutput, vi->visual, CWColormap | CWEventMask, &swa);
+	XMapWindow(display, window);
+
+	XStoreName(display, window, "Tris game");
+
+	gl_context = glXCreateContext(display, vi, NULL, GL_TRUE);
+	glXMakeCurrent(display, window, gl_context);
+}
+
+void
+ui_loop(void (*draw_frame)())
+{
+	XEvent event;
+	while (1) {
+		XNextEvent(display, &event);
+		if (event.type == Expose) {
+			draw_frame();
+			glXSwapBuffers(display, window);
+		}
+		if (event.type == KeyPress) {
+			break;
+		}
+	}
+
+	cleanup();
+}
+
+void
+cleanup(void) {
+	glXMakeCurrent(display, None, NULL);
+	glXDestroyContext(display, gl_context);
+	XDestroyWindow(display, window);
+	XCloseDisplay(display);
+}