+ ctx->Viewport._WindowMap.m[MAT_TY]);
ctx->Current.RasterPos[2] = (ndc[2] * ctx->Viewport._WindowMap.m[MAT_SZ]
+ ctx->Viewport._WindowMap.m[MAT_TZ])
- / ctx->DepthMaxF;
+ / ctx->DrawBuffer->_DepthMaxF;
ctx->Current.RasterPos[3] = clip[3];
/* compute raster distance */