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Tweaked S3 ViRGE clipping. Based on patch from rene.

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This commit is contained in:
SarahW 2019-01-15 21:33:24 +00:00
commit 140903f4cb
1 changed files with 6 additions and 3 deletions
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9
src/vid_s3_virge.c
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@ -2975,7 +2975,7 @@ static void tri(virge_t *virge, s3d_t *s3d_tri, s3d_state_t *state, int yc, int3
y_count -= diff_y;
}
if ((state->y - y_count) < s3d_tri->clip_t)
y_count = state->y - s3d_tri->clip_t;
y_count = (state->y - s3d_tri->clip_t) + 1;
}
for (; y_count > 0; y_count--)
@ -3018,7 +3018,7 @@ static void tri(virge_t *virge, s3d_t *s3d_tri, s3d_state_t *state, int yc, int3
if (xe < s3d_tri->clip_l)
goto tri_skip_line;
if (xe > s3d_tri->clip_r)
xe = s3d_tri->clip_r;
xe = s3d_tri->clip_r + 1;
if (x < s3d_tri->clip_l)
{
int diff_x = s3d_tri->clip_l - x;
@ -3043,7 +3043,7 @@ static void tri(virge_t *virge, s3d_t *s3d_tri, s3d_state_t *state, int yc, int3
if (xe > s3d_tri->clip_r)
goto tri_skip_line;
if (xe < s3d_tri->clip_l)
xe = s3d_tri->clip_l;
xe = s3d_tri->clip_l - 1;
if (x > s3d_tri->clip_r)
{
int diff_x = x - s3d_tri->clip_r;
@ -3068,6 +3068,9 @@ static void tri(virge_t *virge, s3d_t *s3d_tri, s3d_state_t *state, int yc, int3
dest_addr = dest_offset + (x * (bpp + 1));
z_addr = z_offset + (x << 1);
x &= 0xfff;
xe &= 0xfff;
for (; x != xe; x = (x + x_dir) & 0xfff)
{
int update = 1;