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authorMichal Krol <michal@vmware.com>2009-10-30 08:03:10 +0000
committerMichal Krol <michal@vmware.com>2009-10-30 08:05:40 +0000
commitca9c413647bf9efb5ed770e3a655bc758075aec7 (patch)
tree6b845bf7cd39730a7507ccdebf9d1f18c599a046 /src/gallium
parent4a253431abf43a0638afb43605b44a8742b72a60 (diff)
softpipe: Respect gl_rasterization_rules in primitive setup.
Diffstat (limited to 'src/gallium')
-rw-r--r--src/gallium/drivers/softpipe/sp_setup.c40
1 files changed, 26 insertions, 14 deletions
diff --git a/src/gallium/drivers/softpipe/sp_setup.c b/src/gallium/drivers/softpipe/sp_setup.c
index 00fb52a64f..615581b95f 100644
--- a/src/gallium/drivers/softpipe/sp_setup.c
+++ b/src/gallium/drivers/softpipe/sp_setup.c
@@ -87,6 +87,8 @@ struct setup_context {
float oneoverarea;
int facing;
+ float pixel_offset;
+
struct quad_header quad[MAX_QUADS];
struct quad_header *quad_ptrs[MAX_QUADS];
unsigned count;
@@ -379,6 +381,16 @@ static boolean setup_sort_vertices( struct setup_context *setup,
((det > 0.0) ^
(setup->softpipe->rasterizer->front_winding == PIPE_WINDING_CW));
+ /* Prepare pixel offset for rasterisation:
+ * - pixel center (0.5, 0.5) for GL, or
+ * - assume (0.0, 0.0) for other APIs.
+ */
+ if (setup->softpipe->rasterizer->gl_rasterization_rules) {
+ setup->pixel_offset = 0.5f;
+ } else {
+ setup->pixel_offset = 0.0f;
+ }
+
return TRUE;
}
@@ -427,7 +439,7 @@ static void tri_linear_coeff( struct setup_context *setup,
/* calculate a0 as the value which would be sampled for the
* fragment at (0,0), taking into account that we want to sample at
- * pixel centers, in other words (0.5, 0.5).
+ * pixel centers, in other words (pixel_offset, pixel_offset).
*
* this is neat but unfortunately not a good way to do things for
* triangles with very large values of dadx or dady as it will
@@ -438,8 +450,8 @@ static void tri_linear_coeff( struct setup_context *setup,
* instead - i'll switch to this later.
*/
coef->a0[i] = (setup->vmin[vertSlot][i] -
- (dadx * (setup->vmin[0][0] - 0.5f) +
- dady * (setup->vmin[0][1] - 0.5f)));
+ (dadx * (setup->vmin[0][0] - setup->pixel_offset) +
+ dady * (setup->vmin[0][1] - setup->pixel_offset)));
/*
debug_printf("attr[%d].%c: %f dx:%f dy:%f\n",
@@ -487,8 +499,8 @@ static void tri_persp_coeff( struct setup_context *setup,
coef->dadx[i] = dadx;
coef->dady[i] = dady;
coef->a0[i] = (mina -
- (dadx * (setup->vmin[0][0] - 0.5f) +
- dady * (setup->vmin[0][1] - 0.5f)));
+ (dadx * (setup->vmin[0][0] - setup->pixel_offset) +
+ dady * (setup->vmin[0][1] - setup->pixel_offset)));
}
@@ -575,12 +587,12 @@ static void setup_tri_coefficients( struct setup_context *setup )
static void setup_tri_edges( struct setup_context *setup )
{
- float vmin_x = setup->vmin[0][0] + 0.5f;
- float vmid_x = setup->vmid[0][0] + 0.5f;
+ float vmin_x = setup->vmin[0][0] + setup->pixel_offset;
+ float vmid_x = setup->vmid[0][0] + setup->pixel_offset;
- float vmin_y = setup->vmin[0][1] - 0.5f;
- float vmid_y = setup->vmid[0][1] - 0.5f;
- float vmax_y = setup->vmax[0][1] - 0.5f;
+ float vmin_y = setup->vmin[0][1] - setup->pixel_offset;
+ float vmid_y = setup->vmid[0][1] - setup->pixel_offset;
+ float vmax_y = setup->vmax[0][1] - setup->pixel_offset;
setup->emaj.sy = ceilf(vmin_y);
setup->emaj.lines = (int) ceilf(vmax_y - setup->emaj.sy);
@@ -780,8 +792,8 @@ line_linear_coeff(const struct setup_context *setup,
coef->dadx[i] = dadx;
coef->dady[i] = dady;
coef->a0[i] = (setup->vmin[vertSlot][i] -
- (dadx * (setup->vmin[0][0] - 0.5f) +
- dady * (setup->vmin[0][1] - 0.5f)));
+ (dadx * (setup->vmin[0][0] - setup->pixel_offset) +
+ dady * (setup->vmin[0][1] - setup->pixel_offset)));
}
@@ -803,8 +815,8 @@ line_persp_coeff(const struct setup_context *setup,
coef->dadx[i] = dadx;
coef->dady[i] = dady;
coef->a0[i] = (setup->vmin[vertSlot][i] -
- (dadx * (setup->vmin[0][0] - 0.5f) +
- dady * (setup->vmin[0][1] - 0.5f)));
+ (dadx * (setup->vmin[0][0] - setup->pixel_offset) +
+ dady * (setup->vmin[0][1] - setup->pixel_offset)));
}