feat: add lights

data/shaders/vertex.glsl

@@ -1,12 +1,19 @@
 uniform mat4 mvp;
+uniform mat4 modelView;
+uniform mat4 normalMatrix;
 attribute vec3 vpos;
 attribute vec3 vcolor;
 attribute vec2 vtexcoord;
+attribute vec3 vnormal;
 varying vec3 fcolor;
 varying vec2 ftexcoord;
+varying vec3 fnormal;
+varying vec4 fposition;
 
 void main() {
 	gl_Position = mvp * vec4(vpos, 1);
 	fcolor = vcolor;
 	ftexcoord = vtexcoord;
+	fnormal = vec3(normalMatrix * vec4(vnormal, 0.0));
+	fposition = modelView * vec4(vpos, 1);
 }