Module: Mesa
Branch: master
Commit: 718cbe4ba95439c074144ea2ce06ebf0915a660c
URL:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=718cbe4ba95439c074144ea2ce06ebf0915a660c
Author: Brian Paul <bri...@vmware.com>
Date: Thu Oct 13 17:16:17 2011 -0600
swrast: be a bit smarter in clip_span()
If no pixels pass the clip test, return false.
---
src/mesa/swrast/s_span.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/src/mesa/swrast/s_span.c b/src/mesa/swrast/s_span.c
index 1aa20f9..e517c9a 100644
--- a/src/mesa/swrast/s_span.c
+++ b/src/mesa/swrast/s_span.c
@@ -707,11 +707,13 @@ clip_span( struct gl_context *ctx, SWspan *span )
const GLint n = span->end;
GLubyte *mask = span->array->mask;
GLint i;
+ GLuint passed = 0;
if (span->arrayMask & SPAN_MASK) {
/* note: using & intead of && to reduce branches */
for (i = 0; i < n; i++) {
mask[i] &= (x[i] >= xmin) & (x[i] < xmax)
& (y[i] >= ymin) & (y[i] < ymax);
+ passed += mask[i];
}
}
else {
@@ -719,9 +721,10 @@ clip_span( struct gl_context *ctx, SWspan *span )
for (i = 0; i < n; i++) {
mask[i] = (x[i] >= xmin) & (x[i] < xmax)
& (y[i] >= ymin) & (y[i] < ymax);
+ passed += mask[i];
}
}
- return GL_TRUE; /* some pixels visible */
+ return passed > 0;
}
else {
/* horizontal span of pixels */
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