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softpipe: fix incorrect provoking vertex color for PIPE_PRIM_POLYGON

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This fixes the incorrect colors seen when rendering flat-shaded polygons.
Note that clipped polygons were correct, but unclipped polygons were wrong.

See the glean/clipFlat test for regression testing.
This commit is contained in:
Brian Paul 2009-05-30 20:07:18 -06:00
parent 1045481dd9
commit a59575d8fb
1 changed files with 15 additions and 1 deletions
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16
src/gallium/drivers/softpipe/sp_prim_vbuf.c
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@ -378,7 +378,6 @@ sp_vbuf_draw_arrays(struct vbuf_render *vbr, uint start, uint nr)
break;
case PIPE_PRIM_TRIANGLE_FAN:
case PIPE_PRIM_POLYGON:
for (i = 2; i < nr; i += 1) {
setup_tri( setup_ctx,
get_vert(vertex_buffer, 0, stride),
@ -386,6 +385,7 @@ sp_vbuf_draw_arrays(struct vbuf_render *vbr, uint start, uint nr)
get_vert(vertex_buffer, i-0, stride));
}
break;
case PIPE_PRIM_QUADS:
for (i = 3; i < nr; i += 4) {
setup_tri( setup_ctx,
@ -412,6 +412,20 @@ sp_vbuf_draw_arrays(struct vbuf_render *vbr, uint start, uint nr)
get_vert(vertex_buffer, i-0, stride));
}
break;
case PIPE_PRIM_POLYGON:
/* Almost same as tri fan but the _first_ vertex specifies the flat
* shading color. Note that the first polygon vertex is passed as
* the last triangle vertex here.
*/
for (i = 2; i < nr; i += 1) {
setup_tri( setup_ctx,
get_vert(vertex_buffer, i-0, stride),
get_vert(vertex_buffer, i-1, stride),
get_vert(vertex_buffer, 0, stride));
}
break;
default:
assert(0);
}