渲染后端加入

shaders/shape.vert

@@ -0,0 +1,13 @@
+#version 300 es
+precision highp float;
+layout(location = 0) in vec2 aPosition;
+layout(location = 1) in vec4 aColor;
+
+uniform mat4 u_viewProjection;
+
+out vec4 vColor;
+
+void main() {
+    gl_Position = u_viewProjection * vec4(aPosition, 0.0, 1.0);
+    vColor = aColor;
+}