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Rearrange _composite to optimize for common cases first

This commit is contained in:
Jeffrey Pfau 2013-10-26 16:43:11 -07:00
parent 6e40c7ec29
commit f5a3fd7c7f
1 changed files with 4 additions and 4 deletions
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4
src/gba/renderers/video-software.c
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@ -613,10 +613,10 @@ static void _composite(struct GBAVideoSoftwareRenderer* renderer, int offset, ui
// We stash the priority on the top bits so we can do a one-operator comparison
// The lower the number, the higher the priority, and sprites take precendence over backgrounds
// We want to do special processing if the color pixel is target 1, however
if ((color & FLAG_ORDER_MASK) < (current & FLAG_ORDER_MASK)) {
if (current & FLAG_UNWRITTEN) {
renderer->row[offset] = color | (current & FLAG_OBJWIN);
} else if (!(color & FLAG_TARGET_1) || !(current & FLAG_TARGET_2)) {
} else if ((color & FLAG_ORDER_MASK) < (current & FLAG_ORDER_MASK)) {
if (!(color & FLAG_TARGET_1) || !(current & FLAG_TARGET_2)) {
renderer->row[offset] = color | FLAG_FINALIZED;
} else {
renderer->row[offset] = _mix(renderer->bldb, current, renderer->blda, color) | FLAG_FINALIZED;