Fix building with opengl, again

Signed-off-by: Yuxuan Shui <yshuiv7@gmail.com>

.editorconfig

@@ -2,3 +2,4 @@ root = true
 [*.{c,h}]
 indent_style = space
 indent_size = 2
+max_line_length = 90

src/common.h

@@ -375,7 +375,7 @@ typedef struct glx_prog_main {
 
 #endif
 #else
-typedef uint32_t glx_prog_main_t;
+struct glx_prog_main { };
 #endif
 
 #define PAINT_INIT { .pixmap = None, .pict = None }

src/render.c

@@ -4,7 +4,11 @@
 #include <xcb/xcb_image.h>
 
 #include "common.h"
+
+#ifdef CONFIG_OPENGL
 #include "opengl.h"
+#endif
+
 #include "vsync.h"
 #include "win.h"
 
@@ -76,7 +80,9 @@ void free_picture(xcb_connection_t *c, xcb_render_picture_t *p) {
  * Free paint_t.
  */
 void free_paint(session_t *ps, paint_t *ppaint) {
+#ifdef CONFIG_OPENGL
 	free_paint_glx(ps, ppaint);
+#endif
 	free_picture(ps->c, &ppaint->pict);
 	if (ppaint->pixmap)
 		xcb_free_pixmap(ps->c, ppaint->pixmap);
@@ -1214,9 +1220,13 @@ bool init_render(session_t *ps) {
 	// Blur filter
 	if (ps->o.blur_background || ps->o.blur_background_frame) {
 		bool ret;
-		if (ps->o.backend == BKEND_GLX)
+		if (ps->o.backend == BKEND_GLX) {
+#ifdef CONFIG_OPENGL
 			ret = glx_init_blur(ps);
-		else
+#else
+			assert(false);
+#endif
+		} else
 			ret = xr_init_blur(ps);
 		if (!ret)
 			return false;

src/vsync.c

@@ -5,7 +5,10 @@
 
 #include "common.h"
 #include "log.h"
+
+#ifdef CONFIG_OPENGL
 #include "opengl.h"
+#endif
 
 #include "vsync.h"