Implement configurable lighting

gpu.h

@@ -9,6 +9,11 @@
 
 #define MAX_FRAMES_IN_FLIGHT 4
 
+typedef struct {
+	vec3_t sun_dir;
+	float cloudiness;
+} light_params_t;
+
 typedef struct {
 	VkInstance inst;
 	VkSurfaceKHR surface;
@@ -77,8 +82,8 @@ void gpu_model_load(
 void gpu_model_cleanup(const gpu_ctx_t *ctx, const gpu_model_t *model);
 
 void gpu_render(
-    const gpu_ctx_t *ctx, mat4_t vp, mat4_t light_vp, size_t model_count,
-    const gpu_model_t *models, const mat4_t **bone_matrices,
-    const mat4_t *model_transforms);
+    const gpu_ctx_t *ctx, mat4_t vp, light_params_t light,
+    size_t model_count, const gpu_model_t *models,
+    const mat4_t **bone_matrices, const mat4_t *model_transforms);
 
 #endif