Generalize the GLX code and refactor for skia to reuse

1 files changed, 68 insertions, 0 deletions

diff --git a/src/glx.cpp b/src/glx.cpp
new file mode 100644
index 0000000..365c25f
--- /dev/null
+++ b/src/glx.cpp
@@ -0,0 +1,68 @@
+#include <err.h>
+#include <stdlib.h>
+
+#include "glx.h"
+
+bool
+createGLXContextAndWindow(glx_state_t *state, int width, int height)
+{
+  int rgba_attribs[] = {
+    GLX_RGBA,
+    GLX_RED_SIZE, 1,
+    GLX_GREEN_SIZE, 1,
+    GLX_BLUE_SIZE, 1,
+    GLX_ALPHA_SIZE, 1,
+    GLX_DOUBLEBUFFER,
+    None
+  };
+  XVisualInfo *visinfo;
+  XSetWindowAttributes xattr;
+
+  state->dpy = XOpenDisplay (NULL);
+  if (state->dpy == NULL) {
+    warnx ("Failed to open display: %s\n", XDisplayName (0));
+    return false;
+  }
+
+  visinfo = glXChooseVisual (state->dpy, DefaultScreen (state->dpy), rgba_attribs);
+  if (visinfo == NULL) {
+    warnx ("Failed to create RGBA and double-buffered visuals\n");
+    XCloseDisplay (state->dpy);
+    return NULL;
+  }
+
+  xattr.colormap = XCreateColormap (state->dpy,
+                                    RootWindow (state->dpy, visinfo->screen),
+                                    visinfo->visual, AllocNone);
+  xattr.border_pixel = 0;
+  state->window = XCreateWindow (state->dpy,
+                                 DefaultRootWindow (state->dpy),
+                                 100, 50,
+                                 width, height, 0, visinfo->depth,
+                                 InputOutput, visinfo->visual,
+                                 CWBorderPixel | CWColormap,
+                                 &xattr);
+  XMapWindow (state->dpy, state->window);
+
+  state->glx_context = glXCreateContext (state->dpy, visinfo, NULL, True);
+  XFree (visinfo);
+
+  if (state->glx_context == NULL) {
+    warnx ("Could not create glx context\n");
+    XCloseDisplay (state->dpy);
+    return false;
+  }
+
+  return true;
+}
+
+void
+destroyGLXContextAndWindow (glx_state_t *state)
+{
+  if (state->dpy) {
+    glXDestroyContext (state->dpy, state->glx_context);
+
+    XDestroyWindow (state->dpy, state->window);
+    XCloseDisplay (state->dpy);
+  }
+}