diff options
Diffstat (limited to 'src/gallium/auxiliary/draw/draw_pt_decompose.h')
-rw-r--r-- | src/gallium/auxiliary/draw/draw_pt_decompose.h | 96 |
1 files changed, 64 insertions, 32 deletions
diff --git a/src/gallium/auxiliary/draw/draw_pt_decompose.h b/src/gallium/auxiliary/draw/draw_pt_decompose.h index 3c44f7c11e..52f9593d46 100644 --- a/src/gallium/auxiliary/draw/draw_pt_decompose.h +++ b/src/gallium/auxiliary/draw/draw_pt_decompose.h @@ -47,33 +47,26 @@ static void FUNC( ARGS, case PIPE_PRIM_TRIANGLES: for (i = 0; i+2 < count; i += 3) { - if (flatfirst) { - /* put provoking vertex in last pos for clipper */ - TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, - (i + 1), - (i + 2), - (i + 0 )); - } - else { - TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, - (i + 0), - (i + 1), - (i + 2 )); - } + TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, + (i + 0), + (i + 1), + (i + 2 )); } break; case PIPE_PRIM_TRIANGLE_STRIP: if (flatfirst) { for (i = 0; i+2 < count; i++) { + /* Emit first triangle vertex as first triangle vertex */ TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, + (i + 0), (i + 1 + (i&1)), - (i + 2 - (i&1)), - (i + 0) ); + (i + 2 - (i&1)) ); } } else { for (i = 0; i+2 < count; i++) { + /* Emit last triangle vertex as last triangle vertex */ TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, (i + 0 + (i&1)), (i + 1 - (i&1)), @@ -87,9 +80,9 @@ static void FUNC( ARGS, if (flatfirst) { for (i = 0; i+2 < count; i++) { TRIANGLE( DRAW_PIPE_RESET_STIPPLE | DRAW_PIPE_EDGE_FLAG_ALL, + (i + 1), (i + 2), - 0, - (i + 1) ); + 0 ); } } else { @@ -105,24 +98,52 @@ static void FUNC( ARGS, case PIPE_PRIM_QUADS: - for (i = 0; i+3 < count; i += 4) { - QUAD( (i + 0), - (i + 1), - (i + 2), - (i + 3)); + /* GL quads don't follow provoking vertex convention */ + if (flatfirst) { + for (i = 0; i+3 < count; i += 4) { + /* emit last quad vertex as first triangle vertex */ + QUAD_FIRST_PV( (i + 3), + (i + 0), + (i + 1), + (i + 2) ); + } + } + else { + for (i = 0; i+3 < count; i += 4) { + /* emit last quad vertex as last triangle vertex */ + QUAD_LAST_PV( (i + 0), + (i + 1), + (i + 2), + (i + 3) ); + } } break; case PIPE_PRIM_QUAD_STRIP: - for (i = 0; i+3 < count; i += 2) { - QUAD( (i + 2), - (i + 0), - (i + 1), - (i + 3)); + /* GL quad strips don't follow provoking vertex convention */ + if (flatfirst) { + for (i = 0; i+3 < count; i += 2) { + /* emit last quad vertex as first triangle vertex */ + QUAD_FIRST_PV( (i + 3), + (i + 2), + (i + 0), + (i + 1) ); + + } + } + else { + for (i = 0; i+3 < count; i += 2) { + /* emit last quad vertex as last triangle vertex */ + QUAD_LAST_PV( (i + 2), + (i + 0), + (i + 1), + (i + 3) ); + } } break; case PIPE_PRIM_POLYGON: + /* GL polygons don't follow provoking vertex convention */ { /* These bitflags look a little odd because we submit the * vertices as (1,2,0) to satisfy flatshade requirements. @@ -138,10 +159,20 @@ static void FUNC( ARGS, if (i + 3 == count) flags |= edge_last; - TRIANGLE( flags, - (i + 1), - (i + 2), - (0)); + if (flatfirst) { + /* emit first polygon vertex as first triangle vertex */ + TRIANGLE( flags, + (0), + (i + 1), + (i + 2) ); + } + else { + /* emit first polygon vertex as last triangle vertex */ + TRIANGLE( flags, + (i + 1), + (i + 2), + (0)); + } } } break; @@ -156,7 +187,8 @@ static void FUNC( ARGS, #undef TRIANGLE -#undef QUAD +#undef QUAD_FIRST_PV +#undef QUAD_LAST_PV #undef POINT #undef LINE #undef FUNC |