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draw: Prevent clipped vertices overflow.

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Some pathological triangles cause a theoritically impossible number of
clipped vertices.

The clipper will still assert, but at least release builds will not
crash, while this problem is further investigated.
This commit is contained in:
José Fonseca 2010-08-26 15:30:51 +01:00
parent 8b597b4ea4
commit 440129521c
1 changed files with 13 additions and 1 deletions
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14
src/gallium/auxiliary/draw/draw_pipe_clip.c
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@ -263,6 +263,8 @@ do_clip_tri( struct draw_stage *stage,
clipmask &= ~(1<<plane_idx);
assert(n < MAX_CLIPPED_VERTICES);
if (n >= MAX_CLIPPED_VERTICES)
return;
inlist[n] = inlist[0]; /* prevent rotation of vertices */
for (i = 1; i <= n; i++) {
@ -272,16 +274,22 @@ do_clip_tri( struct draw_stage *stage,
if (!IS_NEGATIVE(dp_prev)) {
assert(outcount < MAX_CLIPPED_VERTICES);
if (outcount >= MAX_CLIPPED_VERTICES)
return;
outlist[outcount++] = vert_prev;
}
if (DIFFERENT_SIGNS(dp, dp_prev)) {
struct vertex_header *new_vert;
assert(tmpnr < MAX_CLIPPED_VERTICES+1);
assert(tmpnr < MAX_CLIPPED_VERTICES + 1);
if (tmpnr >= MAX_CLIPPED_VERTICES + 1)
return;
new_vert = clipper->stage.tmp[tmpnr++];
assert(outcount < MAX_CLIPPED_VERTICES);
if (outcount >= MAX_CLIPPED_VERTICES)
return;
outlist[outcount++] = new_vert;
if (IS_NEGATIVE(dp)) {
@ -326,6 +334,8 @@ do_clip_tri( struct draw_stage *stage,
if (stage->draw->rasterizer->flatshade_first) {
if (inlist[0] != header->v[0]) {
assert(tmpnr < MAX_CLIPPED_VERTICES + 1);
if (tmpnr >= MAX_CLIPPED_VERTICES + 1)
return;
inlist[0] = dup_vert(stage, inlist[0], tmpnr++);
copy_colors(stage, inlist[0], header->v[0]);
}
@ -333,6 +343,8 @@ do_clip_tri( struct draw_stage *stage,
else {
if (inlist[0] != header->v[2]) {
assert(tmpnr < MAX_CLIPPED_VERTICES + 1);
if (tmpnr >= MAX_CLIPPED_VERTICES + 1)
return;
inlist[0] = dup_vert(stage, inlist[0], tmpnr++);
copy_colors(stage, inlist[0], header->v[2]);
}