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swrast: be a bit smarter in clip_span()

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If no pixels pass the clip test, return false.
This commit is contained in:
Brian Paul 2011-10-13 17:16:17 -06:00
parent bc4ef33108
commit 718cbe4ba9
1 changed files with 4 additions and 1 deletions
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5
src/mesa/swrast/s_span.c
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@ -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 */