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Implement AA points and AA coverage application in quad pipeline.

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Brian
2007-07-13 10:33:48 -06:00
parent 5796056e28
commit 46bba80a54
8 changed files with 155 additions and 26 deletions
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89
src/mesa/pipe/softpipe/sp_prim_setup.c
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@@ -858,60 +858,97 @@ setup_point(struct draw_stage *stage, struct prim_header *prim)
const GLint ixmax = block((GLint) (x + halfSize));
const GLint iymin = block((GLint) (y - halfSize));
const GLint iymax = block((GLint) (y + halfSize));
GLfloat halfSizeSquared = halfSize * halfSize;
GLint ix, iy;
for (iy = iymin; iy <= iymax; iy += 2) {
for (ix = ixmin; ix <= ixmax; ix += 2) {
if (round) {
/* rounded points */
const GLfloat rmin = halfSize - 0.7071F; /* 0.7071 = sqrt(2)/2 */
const GLfloat rmax = halfSize + 0.7071F;
const GLfloat rmin2 = MAX2(0.0F, rmin * rmin);
const GLfloat rmax2 = rmax * rmax;
const GLfloat cscale = 1.0F / (rmax2 - rmin2);
if (round) {
/* rounded points */
/* XXX for GL_SMOOTH, need to compute per-fragment coverage too */
GLfloat dx, dy;
for (iy = iymin; iy <= iymax; iy += 2) {
for (ix = ixmin; ix <= ixmax; ix += 2) {
GLfloat dx, dy, dist2, cover;
setup->quad.mask = 0x0;
dx = (ix + 0.5) - x;
dy = (iy + 0.5) - y;
if (dx * dx + dy * dy <= halfSizeSquared)
dist2 = dx * dx + dy * dy;
if (dist2 <= rmax2) {
cover = 1.0F - (dist2 - rmin2) * cscale;
setup->quad.coverage[QUAD_BOTTOM_LEFT] = MIN2(cover, 1.0);
setup->quad.mask |= MASK_BOTTOM_LEFT;
}
dx = (ix + 1.5) - x;
dy = (iy + 0.5) - y;
if (dx * dx + dy * dy <= halfSizeSquared)
dist2 = dx * dx + dy * dy;
if (dist2 <= rmax2) {
cover = 1.0F - (dist2 - rmin2) * cscale;
setup->quad.coverage[QUAD_BOTTOM_RIGHT] = MIN2(cover, 1.0);
setup->quad.mask |= MASK_BOTTOM_RIGHT;
}
dx = (ix + 0.5) - x;
dy = (iy + 1.5) - y;
if (dx * dx + dy * dy <= halfSizeSquared)
dist2 = dx * dx + dy * dy;
if (dist2 <= rmax2) {
cover = 1.0F - (dist2 - rmin2) * cscale;
setup->quad.coverage[QUAD_TOP_LEFT] = MIN2(cover, 1.0);
setup->quad.mask |= MASK_TOP_LEFT;
}
dx = (ix + 1.5) - x;
dy = (iy + 1.5) - y;
if (dx * dx + dy * dy <= halfSizeSquared)
dist2 = dx * dx + dy * dy;
if (dist2 <= rmax2) {
cover = 1.0F - (dist2 - rmin2) * cscale;
setup->quad.coverage[QUAD_TOP_RIGHT] = MIN2(cover, 1.0);
setup->quad.mask |= MASK_TOP_RIGHT;
}
if (setup->quad.mask) {
setup->quad.x0 = ix;
setup->quad.y0 = iy;
quad_emit( setup->softpipe, &setup->quad );
}
}
else {
/* square points */
}
}
else {
/* square points */
for (iy = iymin; iy <= iymax; iy += 2) {
for (ix = ixmin; ix <= ixmax; ix += 2) {
setup->quad.mask = 0xf;
if (ix + 0.5 < x - halfSize)
setup->quad.mask &= (MASK_BOTTOM_RIGHT | MASK_TOP_RIGHT);
if (ix + 0.5 < x - halfSize) {
/* fragment is past left edge of point, turn off left bits */
setup->quad.mask &= ~(MASK_BOTTOM_LEFT | MASK_TOP_LEFT);
}
if (ix + 1.5 > x + halfSize)
setup->quad.mask &= (MASK_BOTTOM_LEFT | MASK_TOP_LEFT);
if (ix + 1.5 > x + halfSize) {
/* past the right edge */
setup->quad.mask &= ~(MASK_BOTTOM_RIGHT | MASK_TOP_RIGHT);
}
if (iy + 0.5 < y - halfSize)
setup->quad.mask &= (MASK_TOP_LEFT | MASK_TOP_RIGHT);
if (iy + 0.5 < y - halfSize) {
/* below the bottom edge */
setup->quad.mask &= ~(MASK_BOTTOM_LEFT | MASK_BOTTOM_RIGHT);
}
if (iy + 1.5 > y + halfSize)
setup->quad.mask &= (MASK_BOTTOM_LEFT | MASK_BOTTOM_RIGHT);
}
if (iy + 1.5 > y + halfSize) {
/* above the top edge */
setup->quad.mask &= ~(MASK_TOP_LEFT | MASK_TOP_RIGHT);
}
if (setup->quad.mask) {
setup->quad.x0 = ix;
setup->quad.y0 = iy;
quad_emit( setup->softpipe, &setup->quad );
if (setup->quad.mask) {
setup->quad.x0 = ix;
setup->quad.y0 = iy;
quad_emit( setup->softpipe, &setup->quad );
}
}
}
}