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Restructure z test code slightly.

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Make the logic slightly closer to an eventual SSE or SPE implementation.
This commit is contained in:
Keith Whitwell
2007-06-24 10:32:48 +01:00
parent 5d69aeb002
commit c2577bb1a0
1 changed files with 24 additions and 33 deletions
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src/mesa/pipe/softpipe/sp_quad_depth_test.c
+24 -33
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@@ -42,6 +42,7 @@ depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
GLuint j;
struct softpipe_surface *sps = softpipe_surface(softpipe->framebuffer.zbuf);
GLfloat zzzz[QUAD_SIZE]; /**< Z for four pixels in quad */
GLuint zmask = 0;
#if 0
assert(sps); /* shouldn't get here if there's no zbuffer */
@@ -55,48 +56,25 @@ depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
switch (softpipe->depth_test.func) {
case PIPE_FUNC_NEVER:
quad->mask = 0x0;
break;
case PIPE_FUNC_LESS:
/* Note this is pretty much a single sse or cell instruction.
*/
for (j = 0; j < QUAD_SIZE; j++) {
if (quad->mask & (1 << j)) {
if (quad->outputs.depth[j] >= zzzz[j]) {
/* fail */
quad->mask &= (1 << j);
}
else if (softpipe->depth_test.writemask) {
/* pass, and update Z buffer */
zzzz[j] = quad->outputs.depth[j];
}
}
if (quad->outputs.depth[j] < zzzz[j])
zmask |= 1 << j;
}
break;
case PIPE_FUNC_EQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (quad->mask & (1 << j)) {
if (quad->outputs.depth[j] != zzzz[j]) {
/* fail */
quad->mask &= (1 << j);
}
else if (softpipe->depth_test.writemask) {
/* pass, and update Z buffer */
zzzz[j] = quad->outputs.depth[j];
}
}
if (quad->outputs.depth[j] == zzzz[j])
zmask |= 1 << j;
}
break;
case PIPE_FUNC_LEQUAL:
for (j = 0; j < QUAD_SIZE; j++) {
if (quad->mask & (1 << j)) {
if (quad->outputs.depth[j] > zzzz[j]) {
/* fail */
quad->mask &= (1 << j);
}
else if (softpipe->depth_test.writemask) {
/* pass, and update Z buffer */
zzzz[j] = quad->outputs.depth[j];
}
}
if (quad->outputs.depth[j] <= zzzz[j])
zmask |= (1 << j);
}
break;
/* XXX fill in remaining cases */
@@ -104,8 +82,21 @@ depth_test_quad(struct quad_stage *qs, struct quad_header *quad)
abort();
}
/* XXX write updated zquad to zbuffer */
sps->write_quad_z(sps, quad->x0, quad->y0, zzzz);
quad->mask &= zmask;
if (softpipe->depth_test.writemask) {
/* This is also efficient with sse / spe instructions:
*/
for (j = 0; j < QUAD_SIZE; j++) {
if (zmask & (1 << j)) {
zzzz[j] = quad->outputs.depth[j];
}
}
/* XXX write updated zquad to zbuffer */
sps->write_quad_z(sps, quad->x0, quad->y0, zzzz);
}
qs->next->run(qs->next, quad);
}