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Add conditional-free implementation (disabled, not tested)

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This commit is contained in:
Keith Whitwell 2007-07-13 11:28:42 +01:00
parent 60a21f6c54
commit aa0f415c8d
1 changed files with 11 additions and 2 deletions
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13
src/mesa/pipe/softpipe/sp_quad_stipple.c
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@ -23,13 +23,15 @@ stipple_quad(struct quad_stage *qs, struct quad_header *quad)
const GLint row0 = quad->y0 % 32;
const GLuint stipple0 = softpipe->poly_stipple.stipple[row0];
const GLuint stipple1 = softpipe->poly_stipple.stipple[row0 + 1];
/* XXX this should be acheivable without conditionals */
#if 1
GLbitfield mask = 0x0;
/* XXX this could be optimize a bit to use just two conditionals */
if ((1 << col0) & stipple0)
mask |= MASK_BOTTOM_LEFT;
if ((2 << col0) & stipple0)
if ((2 << col0) & stipple0) /* note: col0 <= 30 */
mask |= MASK_BOTTOM_RIGHT;
if ((1 << col0) & stipple1)
@ -39,6 +41,13 @@ stipple_quad(struct quad_stage *qs, struct quad_header *quad)
mask |= MASK_TOP_RIGHT;
quad->mask &= mask;
#else
/* XXX there may be a better way to lay out the stored stipple
* values to further simplify this computation.
*/
quad->mask &= (((stipple0 >> col0) & 0x3) |
(((stipple1 >> col0) & 0x3) << 2));
#endif
if (quad->mask)
qs->next->run(qs->next, quad);