From 3b2fceed064c06d55e1cd33d51e855e909c81f75 Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Sun, 10 Oct 2021 12:56:55 +0200
Subject: add event and test graphics

---
 src/window.c | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 93 insertions(+), 1 deletion(-)

(limited to 'src/window.c')

diff --git a/src/window.c b/src/window.c
index 39855da..9836907 100644
--- a/src/window.c
+++ b/src/window.c
@@ -1,13 +1,105 @@
 #include "../include/mgl/window.h"
+#include "../include/mgl/mgl.h"
+#include <X11/Xutil.h>
+#include <stdio.h>
 
-void mgl_window_init(mgl_window *self) {
+#define GL_COLOR_BUFFER_BIT 0x00004000
 
+int mgl_window_create(mgl_window *self, const char *title, int width, int height, mgl_window_callback *callback, void *userdata) {
+    return mgl_window_create_with_params(self, title, width, height, DefaultRootWindow(mgl_get_context()->connection), callback, userdata);
+}
+
+int mgl_window_create_with_params(mgl_window *self, const char *title, int width, int height, unsigned long parent_window, mgl_window_callback *callback, void *userdata) {
+    self->window = 0;
+    self->callback = *callback;
+    self->callback_userdata = userdata;
+
+    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 = ExposureMask | 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);
+    if(!self->window) {
+        fprintf(stderr, "XCreateWindow failed\n");
+        mgl_window_deinit(self);
+        return -1;
+    }
+
+    /* TODO: Test utf8 */
+    XStoreName(context->connection, self->window, title);
+    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 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->glx.glXSwapBuffers(context->connection, self->window);
 }
 
 void mgl_window_show(mgl_window *self) {
+    mgl_context *context = mgl_get_context();
+
+    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->glx.glXMakeCurrent(context->connection, self->window, context->glx_context);
+    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) {
+    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 = timeout_ms / 1000;
+    tv.tv_usec = (timeout_ms * 1000) - (tv.tv_sec * 1000 * 1000);
 
+    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);
+        }
+    }
 }
-- 
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