opengl: enforce use of non-power-of-2-textures when drawing using Open GL ES...

opengl: enforce use of non-power-of-2-textures when drawing using Open GL ES 2, since those are supported by specification

Hence, checks for extensions adding this feature will fail.

This solves a green line issue on Apple's ES2 platform

modules/video_output/opengl.c

@@ -382,6 +382,14 @@ vout_display_opengl_t *vout_display_opengl_New(video_format_t *fmt,
     vgl->supports_npot = HasExtension(extensions, "GL_ARB_texture_non_power_of_two") ||
                          HasExtension(extensions, "GL_APPLE_texture_2D_limited_npot");
 
+#if USE_OPENGL_ES
+    /* OpenGL ES 2 includes support for non-power of 2 textures by specification
+     * so checks for extensions are bound to fail. Check for OpenGL ES version instead. */
+    const unsigned char *ogl_version = glGetString(GL_VERSION);
+    if (strverscmp((const char *)ogl_version, "2.0") >= 0)
+        vgl->supports_npot = true;
+#endif
+
     GLint max_texture_units = 0;
     glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &max_texture_units);