implement image atlasing and tiling

resources/shaders/tiling.fs

@@ -0,0 +1,16 @@
+#version 330 core
+
+uniform sampler2D diffuseMap;
+uniform vec2 textureTiling;
+
+in vec2 fragTexCoord;
+in vec2 fragTexCoord2;
+in vec4 fragColor;
+
+out vec4 outColor;
+
+void main()
+{
+    vec2 texCoord = (floor(fragTexCoord*textureTiling) + fract(fragTexCoord2)) / textureTiling;
+    outColor = texture(diffuseMap, texCoord);
+}

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);
+}