diff options
Diffstat (limited to 'src/gallium/auxiliary/draw/draw_private.h')
| -rw-r--r-- | src/gallium/auxiliary/draw/draw_private.h | 24 |
1 files changed, 21 insertions, 3 deletions
diff --git a/src/gallium/auxiliary/draw/draw_private.h b/src/gallium/auxiliary/draw/draw_private.h index f42cded118a..d8cd8ebdb64 100644 --- a/src/gallium/auxiliary/draw/draw_private.h +++ b/src/gallium/auxiliary/draw/draw_private.h @@ -55,6 +55,10 @@ struct gallivm_state; /** Sum of frustum planes and user-defined planes */ #define DRAW_TOTAL_CLIP_PLANES (6 + PIPE_MAX_CLIP_PLANES) +/** + * The largest possible index of a vertex that can be fetched. + */ +#define DRAW_MAX_FETCH_IDX 0xffffffff struct pipe_context; struct draw_vertex_shader; @@ -468,14 +472,13 @@ void draw_stats_clipper_primitives(struct draw_context *draw, const struct draw_prim_info *prim_info); - /** * Return index i from the index buffer. * If the index buffer would overflow we return the - * index of the first element in the vb. + * maximum possible index. */ #define DRAW_GET_IDX(_elts, _i) \ - (((_i) >= draw->pt.user.eltMax) ? 0 : (_elts)[_i]) + (((_i) >= draw->pt.user.eltMax) ? DRAW_MAX_FETCH_IDX : (_elts)[_i]) /** * Return index of the given viewport clamping it @@ -487,5 +490,20 @@ draw_clamp_viewport_idx(int idx) return ((PIPE_MAX_VIEWPORTS > idx || idx < 0) ? idx : 0); } +/** + * Adds two unsigned integers and if the addition + * overflows then it returns the value from + * from the overflow_value variable. + */ +static INLINE unsigned +draw_overflow_uadd(unsigned a, unsigned b, + unsigned overflow_value) +{ + unsigned res = a + b; + if (res < a || res < b) { + res = overflow_value; + } + return res; +} #endif /* DRAW_PRIVATE_H */ |