GuConvexEdgeFlags.h

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#ifndef GU_CONVEX_EDGE_FLAGS_H
#define GU_CONVEX_EDGE_FLAGS_H
 
#include "foundation/PxSimpleTypes.h"
 
namespace physx
{
namespace Gu
{
    enum ExtraTrigDataFlag
    {
        ETD_SILHOUETTE_EDGE_01 = (1 << 0),  //First edge is a silhouette edge
        ETD_SILHOUETTE_EDGE_12 = (1 << 1),  //Second edge is a silhouette edge
        ETD_SILHOUETTE_EDGE_20 = (1 << 2),  //Third edge is a silhouette edge
        ETD_CONVEX_EDGE_01  = (1<<3),   // PT: important value, don't change
        ETD_CONVEX_EDGE_12  = (1<<4),   // PT: important value, don't change
        ETD_CONVEX_EDGE_20  = (1<<5),   // PT: important value, don't change
 
        ETD_CONVEX_EDGE_ALL = ETD_CONVEX_EDGE_01|ETD_CONVEX_EDGE_12|ETD_CONVEX_EDGE_20
    };
 
    // PT: helper function to make sure we use the proper default flags everywhere
    PX_FORCE_INLINE PxU8 getConvexEdgeFlags(const PxU8* extraTrigData, PxU32 triangleIndex)
    {
        return extraTrigData ? extraTrigData[triangleIndex] : PxU8(ETD_CONVEX_EDGE_ALL);
    }
 
    PX_FORCE_INLINE void flipConvexEdgeFlags(PxU8& extraData)
    {
        // PT: this is a fix for PX-2327. When we flip the winding we also need to flip the precomputed edge flags.
        // 01 => 02
        // 12 => 21
        // 20 => 10
 
        const PxU8 convex01 = extraData & Gu::ETD_CONVEX_EDGE_01;
        const PxU8 convex12 = extraData & Gu::ETD_CONVEX_EDGE_12;
        const PxU8 convex20 = extraData & Gu::ETD_CONVEX_EDGE_20;
        const PxU8 silhouette01 = extraData & Gu::ETD_SILHOUETTE_EDGE_01;
        const PxU8 silhouette12 = extraData & Gu::ETD_SILHOUETTE_EDGE_12;
        const PxU8 silhouette20 = extraData & Gu::ETD_SILHOUETTE_EDGE_20;
        extraData = convex12|silhouette12;
        if(convex01)
            extraData |= Gu::ETD_CONVEX_EDGE_20;
        if(convex20)
            extraData |= Gu::ETD_CONVEX_EDGE_01;
        if(silhouette01)
            extraData |= Gu::ETD_SILHOUETTE_EDGE_20;
        if(silhouette20)
            extraData |= Gu::ETD_SILHOUETTE_EDGE_01;
    }
}
}
 
#endif