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sega/model2: fix textured mesh polygons #14427

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Merged
ajrhacker merged 1 commit into from
Oct 27, 2025
Merged

sega/model2: fix textured mesh polygons #14427

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13 changes: 10 additions & 3 deletions src/mame/sega/model2rd.ipp
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Original file line number Diff line number Diff line change
Expand Up @@ -178,9 +178,16 @@ void model2_renderer::draw_scanline_tex(int32_t scanline, const extent_t &extent
colortable_b += ((colorbase >> 10) & 0x1f) << 8;

int x = extent.startx;
int dx = checker ? 2 : 1;
if (checker && !((x ^ scanline) & 1))
x++;
int dx = 1;
if (checker)
{
// if the first pixel is transparent, skip to the next one
if (!((x ^ scanline) & 1))
x++, ooz += dooz, uoz += dudxoz, voz += dvdxoz;

// increment by 2 pixels each time, skipping every other pixel
dx = 2, dooz *= 2.0f, dudxoz *= 2.0f, dvdxoz *= 2.0f;
}

for (; x < extent.stopx; x += dx, uoz += dudxoz, voz += dvdxoz, ooz += dooz)
{
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