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gl-renderer: Make clip_transformed() surf parameter constant

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Calling clip_transformed() 4 times in a row with the same polygon8 in
commit a4d31fa8bd introduced a bug
because the surf input is modified each time. This is fixed by working
on a local copy. The input parameter is marked constant to reflect the
change on the function prototype.

Fixes #764

Signed-off-by: Loïc Molinari <loic.molinari@gmail.com>
This commit is contained in:
Loïc Molinari 2023-06-22 19:09:31 +02:00 committed by Derek Foreman
parent 68fd41a719
commit edd5d1cc09
2 changed files with 14 additions and 14 deletions
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26
libweston/vertex-clipping.c
View file

@ -294,29 +294,29 @@ clip_simple(struct clip_context *ctx,
WESTON_EXPORT_FOR_TESTS int
clip_transformed(struct clip_context *ctx,
struct polygon8 *surf,
const struct polygon8 *surf,
struct clip_vertex *restrict vertices)
{
struct polygon8 polygon;
struct polygon8 p = *surf, tmp;
int i, n;
polygon.n = clip_polygon_left(ctx, surf, polygon.pos);
surf->n = clip_polygon_right(ctx, &polygon, surf->pos);
polygon.n = clip_polygon_top(ctx, surf, polygon.pos);
surf->n = clip_polygon_bottom(ctx, &polygon, surf->pos);
tmp.n = clip_polygon_left(ctx, &p, tmp.pos);
p.n = clip_polygon_right(ctx, &tmp, p.pos);
tmp.n = clip_polygon_top(ctx, &p, tmp.pos);
p.n = clip_polygon_bottom(ctx, &tmp, p.pos);
/* Get rid of duplicate vertices */
vertices[0] = surf->pos[0];
vertices[0] = p.pos[0];
n = 1;
for (i = 1; i < surf->n; i++) {
if (float_difference(vertices[n - 1].x, surf->pos[i].x) == 0.0f &&
float_difference(vertices[n - 1].y, surf->pos[i].y) == 0.0f)
for (i = 1; i < p.n; i++) {
if (float_difference(vertices[n - 1].x, p.pos[i].x) == 0.0f &&
float_difference(vertices[n - 1].y, p.pos[i].y) == 0.0f)
continue;
vertices[n] = surf->pos[i];
vertices[n] = p.pos[i];
n++;
}
if (float_difference(vertices[n - 1].x, surf->pos[0].x) == 0.0f &&
float_difference(vertices[n - 1].y, surf->pos[0].y) == 0.0f)
if (float_difference(vertices[n - 1].x, p.pos[0].x) == 0.0f &&
float_difference(vertices[n - 1].y, p.pos[0].y) == 0.0f)
n--;
return n;

2
libweston/vertex-clipping.h
View file

@ -64,7 +64,7 @@ clip_simple(struct clip_context *ctx,
int
clip_transformed(struct clip_context *ctx,
struct polygon8 *surf,
const struct polygon8 *surf,
struct clip_vertex *restrict vertices);
/*