Added origin_lower_left field to pipe_rasterizer_state

This controls whether the window origin is considered to be the lower-left
or upper-left corner.
This effects computation of gl_FragCoord and the application of polygon stipple.

1 files changed, 12 insertions, 4 deletions

diff --git a/src/mesa/pipe/softpipe/sp_quad_stipple.c b/src/mesa/pipe/softpipe/sp_quad_stipple.c
index 04d95989c4..0c42963dfe 100644
--- a/src/mesa/pipe/softpipe/sp_quad_stipple.c
+++ b/src/mesa/pipe/softpipe/sp_quad_stipple.c
@@ -22,10 +22,18 @@ stipple_quad(struct quad_stage *qs, struct quad_header *quad)
    if (quad->prim == PRIM_TRI) {
       struct softpipe_context *softpipe = qs->softpipe;
       /* need to invert Y to index into OpenGL's stipple pattern */
-      const int y0 = softpipe->framebuffer.cbufs[0]->height - 1 - quad->y0;
-      const int y1 = y0 - 1;
-      const unsigned stipple0 = softpipe->poly_stipple.stipple[y0 % 32];
-      const unsigned stipple1 = softpipe->poly_stipple.stipple[y1 % 32];
+      int y0, y1;
+      uint stipple0, stipple1;
+      if (softpipe->rasterizer->origin_lower_left) {
+         y0 = softpipe->framebuffer.cbufs[0]->height - 1 - quad->y0;
+         y1 = y0 - 1;
+      }
+      else {
+         y0 = quad->y0;
+         y1 = y0 + 1;
+      }
+      stipple0 = softpipe->poly_stipple.stipple[y0 % 32];
+      stipple1 = softpipe->poly_stipple.stipple[y1 % 32];
 
 #if 1
       const int col0 = quad->x0 % 32;