[RELEASE] u22-v04

This version is submitted for U22 final presentation. (squashed 158 commits)

core/loshader/particle.fshader

@@ -0,0 +1,9 @@
+in vec2  v_uv;
+in vec4  v_color;
+in float v_time;
+
+out vec4 o_color;
+
+void main(void) {
+  o_color = vec4(0., 0., 0., 1.);
+}