Use instanced arrays to draw the lights

shaders/light_vert.glsl

@@ -0,0 +1,18 @@
+#version 330 core
+
+#define POINT_LIGHT_COUNT 4
+
+layout(location=0) in vec3 position;
+layout(location=1) in vec3 normal;
+layout(location=2) in vec2 uv;
+layout(location=3) in mat4 model;
+
+layout (std140) uniform Common {
+  mat4 projection;
+  mat4 view;
+  vec3 camera_position;
+};
+
+void main() {
+  gl_Position = projection * view * model * vec4(position, 1.0);
+};