diff options
Diffstat (limited to 'src/mesa')
| -rw-r--r-- | src/mesa/pipe/softpipe/sp_quad_earlyz.c | 34 |
1 files changed, 13 insertions, 21 deletions
diff --git a/src/mesa/pipe/softpipe/sp_quad_earlyz.c b/src/mesa/pipe/softpipe/sp_quad_earlyz.c index 7e0b37519c..89fab2dd35 100644 --- a/src/mesa/pipe/softpipe/sp_quad_earlyz.c +++ b/src/mesa/pipe/softpipe/sp_quad_earlyz.c @@ -31,38 +31,30 @@ #include "pipe/p_defines.h" #include "pipe/p_util.h" -#include "sp_context.h" #include "sp_headers.h" -#include "sp_surface.h" #include "sp_quad.h" -#include "sp_tile_cache.h" + +/** + * All this stage does is compute the quad's Z values (which is normally + * done by the shading stage). + * The next stage will do the actual depth test. + */ static void earlyz_quad( struct quad_stage *qs, struct quad_header *quad ) { - uint i; const float fx = (float) quad->x0; const float fy = (float) quad->y0; - float xy[4][2]; + const float dzdx = quad->coef[0].dadx[2]; + const float dzdy = quad->coef[0].dady[2]; + const float z0 = quad->coef[0].a0[2] + dzdx * fx + dzdy * fy; - xy[0][0] = fx; - xy[1][0] = fx + 1.0f; - xy[2][0] = fx; - xy[3][0] = fx + 1.0f; - - xy[0][1] = fy; - xy[1][1] = fy; - xy[2][1] = fy + 1.0f; - xy[3][1] = fy + 1.0f; - - for (i = 0; i < QUAD_SIZE; i++) { - quad->outputs.depth[i] = - quad->coef[0].a0[2] + - quad->coef[0].dadx[2] * xy[i][0] + - quad->coef[0].dady[2] * xy[i][1]; - } + quad->outputs.depth[0] = z0; + quad->outputs.depth[1] = z0 + dzdx; + quad->outputs.depth[2] = z0 + dzdy; + quad->outputs.depth[3] = z0 + dzdx + dzdy; if (qs->next) { qs->next->run( qs->next, quad ); |