implement image atlasing and tiling

resources/shaders/tiling.vs

@@ -0,0 +1,19 @@
+#version 330
+
+in vec3 vertexPosition;
+in vec2 vertexTexCoord;
+in vec2 vertexTexCoord2;
+in vec4 vertexColor;
+
+out vec2 fragTexCoord;
+out vec2 fragTexCoord2;
+out vec4 fragColor;
+
+uniform mat4 mvp;
+
+void main() {
+	fragTexCoord = vertexTexCoord;
+	fragColor = vertexColor;
+  fragTexCoord2 = vertexTexCoord2;
+  gl_Position = mvp*vec4(vertexPosition, 1.0);
+}