medfall

commit 3abebe1b8f077a106949da5a7520e16ca987d8a4
parent a90e3cb42e4b60af9fdcc7d440b67ab0ef19b579
Author: Michael Savage <mikejsavage@gmail.com>
Date:   Wed, 15 Nov 2017 23:45:54 +0200

Small optimisation

Diffstat:
clipmap.cc
 | 
20
++++++++------------

1 file changed, 8 insertions(+), 12 deletions(-)
diff --git a/clipmap.cc b/clipmap.cc
@@ -514,17 +514,11 @@ GAME_FRAME( game_frame ) {
 	UniformBinding sun_uniforms = renderer_uniforms( sun_dir, game->sun_angle );
 
 	v2 clipmap_tl;
-	v2 clipmap_br;
-	float max_scale;
+	float scale = 1.0f;
+	v2 base = v2( -float( PATCH_RESOLUTION * 2 ) );
 
 	// draw terrain
 	for( u32 l = 0; l < NUM_LODS; l++ ) {
-		float scale = 1.0f;
-		v2 base = v2( -float( PATCH_RESOLUTION * 2 ) );
-		for( u32 i = 0; i < l; i++ ) {
-			scale *= 2.0f;
-			base *= 2.0f;
-		}
 		v2 tile_size = v2( scale * float( PATCH_RESOLUTION ) );
 
 		for( int x = 0; x < 4; x++ ) {
@@ -562,12 +556,14 @@ GAME_FRAME( game_frame ) {
 		}
 
 		clipmap_tl = base + game->pos.xy();
-		max_scale = scale;
+		scale *= 2.0f;
+		base *= 2.0f;
 	}
 
-	clipmap_tl.x = floorf( clipmap_tl.x / max_scale ) * max_scale;
-	clipmap_tl.y = floorf( clipmap_tl.y / max_scale ) * max_scale;
-	clipmap_br = clipmap_tl + v2( 4 * max_scale * float( PATCH_RESOLUTION ) );
+	scale /= 2.0f;
+	clipmap_tl.x = floorf( clipmap_tl.x / scale ) * scale;
+	clipmap_tl.y = floorf( clipmap_tl.y / scale ) * scale;
+	v2 clipmap_br = clipmap_tl + v2( 4 * scale * float( PATCH_RESOLUTION ) );
 
 	// draw skirts
 	{