feat: assignment 3

data/shaders/vertex.glsl

@@ -1,9 +1,12 @@
 uniform mat4 mvp;
 attribute vec3 vpos;
 attribute vec3 vcolor;
+attribute vec2 vtexcoord;
 varying vec3 fcolor;
+varying vec2 ftexcoord;
 
 void main() {
 	gl_Position = mvp * vec4(vpos, 1);
 	fcolor = vcolor;
+	ftexcoord = vtexcoord;
 }