Fix T96845: artifacts with GPU subdivision and mirror modifier
The coarse polygon count was set to the one of the BMesh instead of the the one of the mesh used for subdivision, which caused the compute shaders to output wrong data.
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@ -1143,7 +1143,7 @@ static void draw_subdiv_init_ubo_storage(const DRWSubdivCache *cache,
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ubo->max_patch_face = cache->gpu_patch_map.max_patch_face;
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ubo->max_depth = cache->gpu_patch_map.max_depth;
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ubo->patches_are_triangular = cache->gpu_patch_map.patches_are_triangular;
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ubo->coarse_poly_count = cache->bm ? cache->bm->totface : cache->num_coarse_poly;
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ubo->coarse_poly_count = cache->num_coarse_poly;
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ubo->optimal_display = cache->optimal_display;
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ubo->num_subdiv_loops = cache->num_subdiv_loops;
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ubo->edge_loose_offset = cache->num_subdiv_loops * 2;
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