diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gallium/auxiliary/draw/draw_pipe_clip.c | 62 |
1 files changed, 57 insertions, 5 deletions
diff --git a/src/gallium/auxiliary/draw/draw_pipe_clip.c b/src/gallium/auxiliary/draw/draw_pipe_clip.c index a10d8e9edc0..b49502cec48 100644 --- a/src/gallium/auxiliary/draw/draw_pipe_clip.c +++ b/src/gallium/auxiliary/draw/draw_pipe_clip.c @@ -163,6 +163,7 @@ static void interp( const struct clip_stage *clip, */ static void emit_poly( struct draw_stage *stage, struct vertex_header **inlist, + const boolean *edgeflags, unsigned n, const struct prim_header *origPrim) { @@ -181,6 +182,9 @@ static void emit_poly( struct draw_stage *stage, edge_last = DRAW_PIPE_EDGE_FLAG_1; } + if (!edgeflags[0]) + edge_first = 0; + /* later stages may need the determinant, but only the sign matters */ header.det = origPrim->det; header.flags = DRAW_PIPE_RESET_STIPPLE | edge_first | edge_middle; @@ -199,7 +203,11 @@ static void emit_poly( struct draw_stage *stage, header.v[2] = inlist[0]; /* the provoking vertex */ } - if (i == n-1) + if (!edgeflags[i-1]) { + header.flags &= ~edge_middle; + } + + if (i == n - 1 && edgeflags[i]) header.flags |= edge_last; if (0) { @@ -248,15 +256,33 @@ do_clip_tri( struct draw_stage *stage, unsigned tmpnr = 0; unsigned n = 3; unsigned i; + boolean aEdges[MAX_CLIPPED_VERTICES]; + boolean bEdges[MAX_CLIPPED_VERTICES]; + boolean *inEdges = aEdges; + boolean *outEdges = bEdges; inlist[0] = header->v[0]; inlist[1] = header->v[1]; inlist[2] = header->v[2]; + /* + * Note: at this point we can't just use the per-vertex edge flags. + * We have to observe the edge flag bits set in header->flags which + * were set during primitive decomposition. Put those flags into + * an edge flags array which parallels the vertex array. + * Later, in the 'unfilled' pipeline stage we'll draw the edge if both + * the header.flags bit is set AND the per-vertex edgeflag field is set. + */ + inEdges[0] = !!(header->flags & DRAW_PIPE_EDGE_FLAG_0); + inEdges[1] = !!(header->flags & DRAW_PIPE_EDGE_FLAG_1); + inEdges[2] = !!(header->flags & DRAW_PIPE_EDGE_FLAG_2); + while (clipmask && n >= 3) { const unsigned plane_idx = ffs(clipmask)-1; + const boolean is_user_clip_plane = plane_idx >= 6; const float *plane = clipper->plane[plane_idx]; struct vertex_header *vert_prev = inlist[0]; + boolean *edge_prev = &inEdges[0]; float dp_prev = dot4( vert_prev->clip, plane ); unsigned outcount = 0; @@ -266,9 +292,11 @@ do_clip_tri( struct draw_stage *stage, if (n >= MAX_CLIPPED_VERTICES) return; inlist[n] = inlist[0]; /* prevent rotation of vertices */ + inEdges[n] = inEdges[0]; for (i = 1; i <= n; i++) { struct vertex_header *vert = inlist[i]; + boolean *edge = &inEdges[i]; float dp = dot4( vert->clip, plane ); @@ -276,11 +304,13 @@ do_clip_tri( struct draw_stage *stage, assert(outcount < MAX_CLIPPED_VERTICES); if (outcount >= MAX_CLIPPED_VERTICES) return; + outEdges[outcount] = *edge_prev; outlist[outcount++] = vert_prev; } if (DIFFERENT_SIGNS(dp, dp_prev)) { struct vertex_header *new_vert; + boolean *new_edge; assert(tmpnr < MAX_CLIPPED_VERTICES + 1); if (tmpnr >= MAX_CLIPPED_VERTICES + 1) @@ -290,6 +320,8 @@ do_clip_tri( struct draw_stage *stage, assert(outcount < MAX_CLIPPED_VERTICES); if (outcount >= MAX_CLIPPED_VERTICES) return; + + new_edge = &outEdges[outcount]; outlist[outcount++] = new_vert; if (IS_NEGATIVE(dp)) { @@ -299,10 +331,22 @@ do_clip_tri( struct draw_stage *stage, float t = dp / (dp - dp_prev); interp( clipper, new_vert, t, vert, vert_prev ); - /* Force edgeflag true in this case: + /* Whether or not to set edge flag for the new vert depends + * on whether it's a user-defined clipping plane. We're + * copying NVIDIA's behaviour here. */ - new_vert->edgeflag = 1; - } else { + if (is_user_clip_plane) { + /* we want to see an edge along the clip plane */ + *new_edge = TRUE; + new_vert->edgeflag = TRUE; + } + else { + /* we don't want to see an edge along the frustum clip plane */ + *new_edge = *edge_prev; + new_vert->edgeflag = FALSE; + } + } + else { /* Coming back in. */ float t = dp_prev / (dp_prev - dp); @@ -311,10 +355,12 @@ do_clip_tri( struct draw_stage *stage, /* Copy starting vert's edgeflag: */ new_vert->edgeflag = vert_prev->edgeflag; + *new_edge = *edge_prev; } } vert_prev = vert; + edge_prev = edge; dp_prev = dp; } @@ -325,6 +371,12 @@ do_clip_tri( struct draw_stage *stage, outlist = tmp; n = outcount; } + { + boolean *tmp = inEdges; + inEdges = outEdges; + outEdges = tmp; + } + } /* If flat-shading, copy provoking vertex color to polygon vertex[0] @@ -353,7 +405,7 @@ do_clip_tri( struct draw_stage *stage, /* Emit the polygon as triangles to the setup stage: */ - emit_poly( stage, inlist, n, header ); + emit_poly( stage, inlist, inEdges, n, header ); } } |