feat: add spot light shadows with a tilled buffer

destrum/assets_src/shaders/shadow.vert

@@ -1,12 +1,20 @@
 #version 460
 
 #extension GL_GOOGLE_include_directive : require
+#extension GL_EXT_buffer_reference : require
+#extension GL_EXT_scalar_block_layout : require
 
-#include "mesh_pcs.glsl"
+#include "vertex.glsl"
+
+layout (push_constant, scalar) uniform constants
+{
+    mat4 modelToLightClip;
+    VertexBuffer vertexBuffer;
+} pcs;
 
 void main()
 {
     Vertex v = pcs.vertexBuffer.vertices[gl_VertexIndex];
 
-    gl_Position = pcs.sceneData.lightViewProj * pcs.transform * vec4(v.position, 1.0f);
+    gl_Position = pcs.modelToLightClip * vec4(v.position, 1.0f);
 }