BoxShape.h

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#ifndef ULT_BOX_SHAPE_H_INCLUDED
#define ULT_BOX_SHAPE_H_INCLUDED
 
#include "../Math/Plane.h"
#include "../Math/Vector3D.h"
#include "../ModelData.h"
 
#define ULT_UNIT_BOX_VERTEX_TOTAL 24
#define ULT_UNIT_BOX_INDEX_TOTAL 36
#define ULT_UNIT_BOX_STRIDE sizeof(Ult::stUnitBoxVertex)
 
namespace Ult
{

struct stUnitBoxVertex
{
    float x, y, z;
    float tu1, tv1;
    float nx, ny, nz;
};

static inline bool CreateCubeMesh(
    const float size,
    ModelData* model,
    std::vector<Plane>* planes
)
{
    if (!model) { return false; }
 
    stUnitBoxVertex UnitBoxData[ULT_UNIT_BOX_VERTEX_TOTAL] = {
        {-1*size, -1*size, -1*size, 1,0, 0,0,1 },
        {+1*size, -1*size, -1*size, 0,0, 0,0,1 },
        {+1*size, +1*size, -1*size, 0,1, 0,0,1 },
        {-1*size, +1*size, -1*size, 1,1, 0,0,1 },
 
        {+1*size, -1*size, +1*size, 1,0, 0,0,-1 },
        {-1*size, -1*size, +1*size, 0,0, 0,0,-1 },
        {-1*size, +1*size, +1*size, 0,1, 0,0,-1 },
        {+1*size, +1*size, +1*size, 1,1, 0,0,-1 },
 
        {-1*size, -1*size, -1*size, 0,0, 1,0,0 },
        {-1*size, +1*size, -1*size, 0,1, 1,0,0 },
        {-1*size, +1*size, +1*size, 1,1, 1,0,0 },
        {-1*size, -1*size, +1*size, 1,0, 1,0,0 },
 
        {+1*size, -1*size, +1*size, 0,0, -1,0,0 },
        {+1*size, +1*size, +1*size, 0,1, -1,0,0 },
        {+1*size, +1*size, -1*size, 1,1, -1,0,0 },
        {+1*size, -1*size, -1*size, 1,0, -1,0,0 },
 
        {-1*size, +1*size, +1*size, 0,0, 0,-1,0 },
        {-1*size, +1*size, -1*size, 0,1, 0,-1,0 },
        {+1*size, +1*size, -1*size, 1,1, 0,-1,0 },
        {+1*size, +1*size, +1*size, 1,0, 0,-1,0 },
 
        {+1*size, -1*size, +1*size, 0,0, 0,1,0 },
        {+1*size, -1*size, -1*size, 0,1, 0,1,0 },
        {-1*size, -1*size, -1*size, 1,1, 0,1,0 },
        {-1*size, -1*size, +1*size, 1,0, 0,1,0 }
    };
 
    if (planes) {
        Plane plane;
        planes->push_back(Plane(0,0,1,size)); // back
        planes->push_back(Plane(0,0,-1,size)); // front
        planes->push_back(Plane(1,0,0,size)); // left
        planes->push_back(Plane(-1,0,0,size)); // right
        planes->push_back(Plane(0,-1,0,size)); // top 
        planes->push_back(Plane(0,1,0,size)); // bottom
    }
 
    unsigned int UnitBoxIndices[ULT_UNIT_BOX_INDEX_TOTAL] = {
        0,1,2, 2,3,0,
        4,5,6, 6,7,4,
        8,9,10, 10,11,8,
        12,13,14, 14,15,12,
        16,17,18, 18,19,16,
        20,21,22, 22,23,20
    };
 
    model->Clear();
    model->AddDescriptorElement(ULT_VERTEX_3F);
    model->AddDescriptorElement(ULT_TEX1_2F);
    model->AddDescriptorElement(ULT_NORMAL_3F);
 
    if (!model->SetVertices(
            ULT_TRI_LIST,
            ULT_UNIT_BOX_VERTEX_TOTAL,
            ULT_UNIT_BOX_STRIDE,
            (char*)UnitBoxData)) {
        return false;
    }
    if (!model->SetIndices(ULT_UNIT_BOX_INDEX_TOTAL, UnitBoxIndices)) { 
        return false;
    }
    return true;
}

static inline bool CreateCubeMesh(const float size, ModelData* model)
{
    return CreateCubeMesh(size, model, nullptr);
}

static inline bool CreateUnitCubeMesh(ModelData* model)
{
    return CreateCubeMesh(1, model, nullptr);
}
 
} // namespace Ult
 
#endif // ULT_BOX_SHAPE_H_INCLUDED