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sega/model2_v.cpp: Fix error in clipping plane calculation (#13582)

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Panoramic views during attract sequence of various games in linked mode should now work properly
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Matthew Daniels 2025-04-12 03:01:22 +01:00 committed by GitHub
parent 9cdce3047e
commit 00adcd4321
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GPG Key ID: B5690EEEBB952194
1 changed files with 14 additions and 12 deletions
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src/mame/sega/model2_v.cpp
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@ -1103,25 +1103,27 @@ void model2_state::model2_3d_push( raster_state *raster, u32 input )
if ( raster->center[i][1] & 0x800 )
raster->center[i][1] = -( 0x800 - (raster->center[i][1] & 0x7FF) );
// calculate left clipping plane
raster->clip_plane[i][0].normal.x = 1.0f / float(raster->center[i][0] - raster->viewport[0]);
// calculate clipping planes
float left_plane = float(raster->center[i][0] - raster->viewport[0]);
float right_plane = float(raster->viewport[2] - raster->center[i][0]);
float top_plane = float(raster->viewport[3] - raster->center[i][1]);
float bottom_plane = float(raster->center[i][1] - raster->viewport[1]);
raster->clip_plane[i][0].normal.x = 1.0f / std::hypot(1.0f, left_plane);
raster->clip_plane[i][0].normal.y = 0.0f;
raster->clip_plane[i][0].normal.pz = 1.0f;
raster->clip_plane[i][0].normal.pz = left_plane / std::hypot(1.0f, left_plane);
// calculate right clipping plane
raster->clip_plane[i][1].normal.x = 1.0f / float(raster->center[i][0] - raster->viewport[2]);
raster->clip_plane[i][1].normal.x = -1.0f / std::hypot(-1.0f, right_plane);
raster->clip_plane[i][1].normal.y = 0.0f;
raster->clip_plane[i][1].normal.pz = 1.0f;
raster->clip_plane[i][1].normal.pz = right_plane / std::hypot(-1.0f, right_plane);
// calculate top clipping plane
raster->clip_plane[i][2].normal.x = 0.0f;
raster->clip_plane[i][2].normal.y = 1.0f / float(raster->center[i][1] - raster->viewport[3]);
raster->clip_plane[i][2].normal.pz = 1.0f;
raster->clip_plane[i][2].normal.y = -1.0f / std::hypot(-1.0f, top_plane);
raster->clip_plane[i][2].normal.pz = top_plane / std::hypot(-1.0f, top_plane);
// calculate bottom clipping plane
raster->clip_plane[i][3].normal.x = 0.0f;
raster->clip_plane[i][3].normal.y = 1.0f / float(raster->center[i][1] - raster->viewport[1]);
raster->clip_plane[i][3].normal.pz = 1.0f;
raster->clip_plane[i][3].normal.y = 1.0f / std::hypot(1.0f, bottom_plane);
raster->clip_plane[i][3].normal.pz = bottom_plane / std::hypot(1.0f, bottom_plane);
}
/* done with this command */