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llvmpipe: scale up bounding box planes to subpixel precision

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Otherwise some planes we get in rasterization have subpixel precision, others
not. Doesn't matter so far, but will soon. (OpenGL actually supports viewports
with subpixel accuracy, so could even do bounding box calcs with that).

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Jose Fonseca <jfonseca@vmware.com>
This commit is contained in:
Roland Scheidegger 2016-01-03 01:13:45 +01:00
parent 0298f5aca7
commit 16530fdc82
3 changed files with 30 additions and 30 deletions
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20
src/gallium/drivers/llvmpipe/lp_setup_line.c
View file

@ -713,24 +713,24 @@ try_setup_line( struct lp_setup_context *setup,
const struct u_rect *scissor =
&setup->scissors[viewport_index];
plane[4].dcdx = -1;
plane[4].dcdx = -1 << 8;
plane[4].dcdy = 0;
plane[4].c = 1-scissor->x0;
plane[4].eo = 1;
plane[4].c = (1-scissor->x0) << 8;
plane[4].eo = 1 << 8;
plane[5].dcdx = 1;
plane[5].dcdx = 1 << 8;
plane[5].dcdy = 0;
plane[5].c = scissor->x1+1;
plane[5].c = (scissor->x1+1) << 8;
plane[5].eo = 0;
plane[6].dcdx = 0;
plane[6].dcdy = 1;
plane[6].c = 1-scissor->y0;
plane[6].eo = 1;
plane[6].dcdy = 1 << 8;
plane[6].c = (1-scissor->y0) << 8;
plane[6].eo = 1 << 8;
plane[7].dcdx = 0;
plane[7].dcdy = -1;
plane[7].c = scissor->y1+1;
plane[7].dcdy = -1 << 8;
plane[7].c = (scissor->y1+1) << 8;
plane[7].eo = 0;
}

20
src/gallium/drivers/llvmpipe/lp_setup_point.c
View file

@ -492,24 +492,24 @@ try_setup_point( struct lp_setup_context *setup,
{
struct lp_rast_plane *plane = GET_PLANES(point);
plane[0].dcdx = -1;
plane[0].dcdx = -1 << 8;
plane[0].dcdy = 0;
plane[0].c = 1-bbox.x0;
plane[0].eo = 1;
plane[0].c = (1-bbox.x0) << 8;
plane[0].eo = 1 << 8;
plane[1].dcdx = 1;
plane[1].dcdx = 1 << 8;
plane[1].dcdy = 0;
plane[1].c = bbox.x1+1;
plane[1].c = (bbox.x1+1) << 8;
plane[1].eo = 0;
plane[2].dcdx = 0;
plane[2].dcdy = 1;
plane[2].c = 1-bbox.y0;
plane[2].eo = 1;
plane[2].dcdy = 1 << 8;
plane[2].c = (1-bbox.y0) << 8;
plane[2].eo = 1 << 8;
plane[3].dcdx = 0;
plane[3].dcdy = -1;
plane[3].c = bbox.y1+1;
plane[3].dcdy = -1 << 8;
plane[3].c = (bbox.y1+1) << 8;
plane[3].eo = 0;
}

20
src/gallium/drivers/llvmpipe/lp_setup_tri.c
View file

@ -676,24 +676,24 @@ do_triangle_ccw(struct lp_setup_context *setup,
if (nr_planes == 7) {
const struct u_rect *scissor = &setup->scissors[viewport_index];
plane[3].dcdx = -1;
plane[3].dcdx = -1 << 8;
plane[3].dcdy = 0;
plane[3].c = 1-scissor->x0;
plane[3].eo = 1;
plane[3].c = (1-scissor->x0) << 8;
plane[3].eo = 1 << 8;
plane[4].dcdx = 1;
plane[4].dcdx = 1 << 8;
plane[4].dcdy = 0;
plane[4].c = scissor->x1+1;
plane[4].c = (scissor->x1+1) << 8;
plane[4].eo = 0;
plane[5].dcdx = 0;
plane[5].dcdy = 1;
plane[5].c = 1-scissor->y0;
plane[5].eo = 1;
plane[5].dcdy = 1 << 8;
plane[5].c = (1-scissor->y0) << 8;
plane[5].eo = 1 << 8;
plane[6].dcdx = 0;
plane[6].dcdy = -1;
plane[6].c = scissor->y1+1;
plane[6].dcdy = -1 << 8;
plane[6].c = (scissor->y1+1) << 8;
plane[6].eo = 0;
}