Letterbox, maintain render-resolution's aspect ratio

pass.odin

@@ -243,10 +243,12 @@ delete_pass :: proc(pass: ^Pass) {
 }
 
 @(private) delete_scene_pass :: proc(pass: ^Scene_Pass) {
+    assert(pass.draw_commands != nil)
     delete(pass.draw_commands)
 }
 
 @(private) delete_post_processing_pass :: proc(pass: ^Post_Processing_Pass) {
+    assert(pass.post_processing_nodes != nil)
     delete(pass.post_processing_nodes)
 }
 
@@ -294,9 +296,10 @@ execute_pass :: proc(renderer: ^Renderer, pass: ^Pass, view_matrix, projection_m
             should_clear_depth := should_write_depth
 
             should_clear_color := true
+            should_scissor :: false
             set_clear_color(renderer, RGBA_Color { 0, 0, 0, 0 })
-
-            clear_screen(renderer, should_clear_color, should_clear_depth)
+            clear_screen(renderer, should_clear_color, should_clear_depth, should_scissor)
+            
             apply_depth(renderer, should_test_depth, should_write_depth)
         
             apply_blend_mode(renderer, t.blend_mode)