Run shadow render pass and compute light position in vertex shaders

model-vert.glsl

@@ -6,10 +6,12 @@ layout(location = 2) in uvec4 bone_indices;
 layout(location = 3) in vec4 weights;
 
 layout(location = 0) out vec3 frag_normal;
+layout(location = 1) out vec4 light_pos;
 
-layout(push_constant) uniform vp_t {
-	mat4 transform;
-} vp;
+layout(push_constant) uniform push_t {
+	mat4 vp;
+	mat4 light_vp;
+} push;
 
 layout(binding = 0) uniform transform_t {
 	mat4 model;
@@ -25,8 +27,10 @@ void main() {
 		+ weights.y * bones.matrices[bone_indices.y]
 		+ weights.z * bones.matrices[bone_indices.z]
 		+ weights.w * bones.matrices[bone_indices.w];
-	gl_Position = vp.transform * transform.model * skinning_matrix
-		* vec4(position, 1.0);
+	const vec4 world_pos
+		= transform.model * skinning_matrix * vec4(position, 1.0);
+	gl_Position = push.vp * world_pos;
 	frag_normal = transpose(
 		inverse(mat3(transform.model * skinning_matrix))) * normal;
+	light_pos = push.light_vp * world_pos;
 }