[RELEASE] u22-v03

This version is submitted to U22 breau.

util/glyphas/drawer.fshader

@@ -0,0 +1,14 @@
+#version 330
+#extension GL_ARB_explicit_uniform_location : enable
+
+layout (location = 0) uniform sampler2D u_tex;
+
+in vec2 v_uv;
+in vec4 v_color;
+
+out vec4 o_color;
+
+void main(void) {
+  float a = texture(u_tex, v_uv).r;
+  o_color = vec4(v_color.rgb, v_color.a*a);
+}