replace vert and frag

src/drawer2D.ts

@@ -1,9 +1,22 @@
 import {createProgramFromSource, ProgramError, ShaderError} from "./gl_util";
 
-/// <reference path="./glsl.d.ts" />
-import vert_src from "./vertex.vert";
-import frag_src from "./fragment.frag";
+const vert_src = `#version 300 es
+layout(location=0) in vec4 pos;
 
+void main() {
+  gl_Position = pos;
+}
+`;
+const frag_src = `#version 300 es
+precision highp float;
+layout(location=0) out vec4 outColor;
+//in vec4 gl_FragCoord;
+//in vec2 gl_PointCoord;
+uniform vec4 u_color;
+
+void main() {
+  outColor = u_color;
+}`;
 import { Drawable } from "./drawable";
 import * as G from "./glWrapper";
 import { getUniformDefaultValue, UniformSet } from "./uniform";