Changeset 691 for soft/giet_vm/applications/raycast

Timestamp:

Aug 5, 2015, 6:46:13 PM (9 years ago)

Author:

guerin

Message:

raycast: precompute ymax

2087497 -> 2021308 cycles/frame (-3.2%) w/ 4 cpus, 512x512

File:

• soft/giet_vm/applications/raycast/disp.c (modified) (2 diffs)

soft/giet_vm/applications/raycast/disp.c

@@ -37 +37 @@
 {
     int y = (y0 >= 0 ? y0 : 0);
-
-    for (; y < y1 && y < FBUF_Y_SIZE; y++) {
+    int ymax = (y1 < FBUF_Y_SIZE ? y1 : FBUF_Y_SIZE);
+
+    for (; y < ymax; y++) {
         // Find texture coordinate
         int ty = (y - y0) * TEX_SIZE / (y1 - y0);
@@ -49 +50 @@
 {
     int y = (y0 >= 0 ? y0 : 0);
-
-    for (; y < y1 && y < FBUF_Y_SIZE; y++) {
+    int ymax = (y1 < FBUF_Y_SIZE ? y1 : FBUF_Y_SIZE);
+
+    for (; y < ymax; y++) {
         buf[cur_buf][y * FBUF_X_SIZE + x] = color;
     }