From 0687370b2e0d8caab3cc4f6ad18fda068bed5518 Mon Sep 17 00:00:00 2001
From: Harry Jeffery <harry@exec64.co.uk>
Date: Sat, 13 Jul 2019 11:38:26 +0100
Subject: Create stub X11 window implementation

---
 Makefile         |   5 ++
 config.mk        |   2 +-
 src/x11_window.c | 150 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 156 insertions(+), 1 deletion(-)
 create mode 100644 src/x11_window.c

diff --git a/Makefile b/Makefile
index e690e8b..a1e6289 100644
--- a/Makefile
+++ b/Makefile
@@ -41,6 +41,11 @@ ifeq ($(WINDOWS),wayland)
 	override LIBS += -lwayland-client -lwayland-egl -lEGL
 endif
 
+ifeq ($(WINDOWS),x11)
+	SOURCES += src/x11_window.c
+	override LIBS += -lX11 -lGL -lGLU
+endif
+
 # Add backends to build as configured
 ifeq ($(BACKEND_FREEIMAGE),yes)
 	SOURCES += src/backend_freeimage.c
diff --git a/config.mk b/config.mk
index c5fe837..7b3e554 100644
--- a/config.mk
+++ b/config.mk
@@ -3,7 +3,7 @@
 #Choices:
 # wayland - Use wayland backend
 # x11 - Use X11 backend
-WINDOWS=wayland
+WINDOWS=x11
 
 # Configure available backends:
 
diff --git a/src/x11_window.c b/src/x11_window.c
new file mode 100644
index 0000000..79046ff
--- /dev/null
+++ b/src/x11_window.c
@@ -0,0 +1,150 @@
+#include "window.h"
+
+#include <assert.h>
+#include <stdlib.h>
+#include <X11/Xlib.h>
+#include<GL/gl.h>
+#include<GL/glx.h>
+
+struct imv_window {
+  Display *x_display;
+  Window x_window;
+  GLXContext x_glc;
+};
+
+struct imv_window *imv_window_create(int w, int h, const char *title)
+{
+  struct imv_window *window = calloc(1, sizeof *window);
+  window->x_display = XOpenDisplay(NULL);
+  assert(window->x_display);
+  Window root = DefaultRootWindow(window->x_display);
+  assert(root);
+  
+  GLint att[] = {
+    GLX_RGBA,
+    GLX_DEPTH_SIZE,
+    24,
+    GLX_DOUBLEBUFFER,
+    None
+  };
+
+  XVisualInfo *vi = glXChooseVisual(window->x_display, 0, att);
+  assert(vi);
+
+  Colormap cmap = XCreateColormap(window->x_display, root,
+      vi->visual, AllocNone);
+
+  XSetWindowAttributes wa = {
+    .colormap = cmap,
+    .event_mask = ExposureMask | KeyPressMask
+  };
+
+  window->x_window = XCreateWindow(window->x_display, root, 0, 0, w, h,
+      0, vi->depth, InputOutput, vi->visual, CWColormap | CWEventMask, &wa);
+
+  XMapWindow(window->x_display, window->x_window);
+  XStoreName(window->x_display, window->x_window, title);
+
+  window->x_glc = glXCreateContext(window->x_display, vi, NULL, GL_TRUE);
+  assert(window->x_glc);
+  glXMakeCurrent(window->x_display, window->x_window, window->x_glc);
+
+  return window;
+}
+
+void imv_window_free(struct imv_window *window)
+{
+  glXDestroyContext(window->x_display, window->x_glc);
+  XCloseDisplay(window->x_display);
+  free(window);
+}
+
+void imv_window_clear(struct imv_window *window, unsigned char r,
+    unsigned char g, unsigned char b)
+{
+  (void)window;
+  glClearColor(r / 255.0f, g / 255.0f, b / 255.0f, 1.0);
+  glClear(GL_COLOR_BUFFER_BIT);
+}
+
+void imv_window_get_size(struct imv_window *window, int *w, int *h)
+{
+  (void)window;
+  (void)w;
+  (void)h;
+}
+
+void imv_window_get_framebuffer_size(struct imv_window *window, int *w, int *h)
+{
+  (void)window;
+  (void)w;
+  (void)h;
+}
+
+void imv_window_set_title(struct imv_window *window, const char *title)
+{
+  XStoreName(window->x_display, window->x_window, title);
+}
+
+bool imv_window_is_fullscreen(struct imv_window *window)
+{
+  (void)window;
+  return false;
+}
+
+void imv_window_set_fullscreen(struct imv_window *window, bool fullscreen)
+{
+  (void)window;
+  (void)fullscreen;
+}
+
+bool imv_window_get_mouse_button(struct imv_window *window, int button)
+{
+  (void)window;
+  (void)button;
+  return false;
+}
+
+void imv_window_get_mouse_position(struct imv_window *window, double *x, double *y)
+{
+  (void)window;
+  (void)x;
+  (void)y;
+}
+
+void imv_window_present(struct imv_window *window)
+{
+  (void)window;
+}
+
+void imv_window_wait_for_event(struct imv_window *window, double timeout)
+{
+  (void)window;
+  (void)timeout;
+}
+
+void imv_window_push_event(struct imv_window *window, struct imv_event *e)
+{
+  (void)window;
+  (void)e;
+}
+
+void imv_window_pump_events(struct imv_window *window, imv_event_handler handler, void *data)
+{
+  (void)handler;
+  (void)data;
+  XEvent xev;
+
+  while (XPending(window->x_display)) {
+    XNextEvent(window->x_display, &xev);
+
+    if (xev.type == Expose) {
+      XWindowAttributes wa;
+      XGetWindowAttributes(window->x_display, window->x_window, &wa);
+      glViewport(0, 0, wa.width, wa.height);
+      glXSwapBuffers(window->x_display, window->x_window);
+    }
+  }
+
+}
+
-- 
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