I believe there are still bugs with all polygon offset types. The point and line
types may need to be handled specially, too.
This shouldn't break anything because it just enabled the occlusion control bits
for polygon offset.
r300PolygonOffset(ctx, ctx->Polygon.OffsetFactor,
ctx->Polygon.OffsetUnits);
+ r300Enable(ctx, GL_POLYGON_OFFSET_POINT, ctx->Polygon.OffsetPoint);
+ r300Enable(ctx, GL_POLYGON_OFFSET_LINE, ctx->Polygon.OffsetLine);
r300Enable(ctx, GL_POLYGON_OFFSET_FILL, ctx->Polygon.OffsetFill);
r300->hw.unk42C0.cmd[1] = 0x4B7FFFFF;