void Plane::Triangulate(VertexBuffer &vb, float uWidth, float vHeight, const vec ¢erPoint, int numFacesU, int numFacesV, bool ccwIsFrontFacing) const
{
vec topLeft = Point(-uWidth*0.5f, -vHeight *0.5f, centerPoint);
vec uEdge = (Point(uWidth*0.5f, -vHeight *0.5f, centerPoint) - topLeft) / (float)numFacesU;
vec vEdge = (Point(-uWidth*0.5f, vHeight *0.5f, centerPoint) - topLeft) / (float)numFacesV;
int i = vb.AppendVertices(numFacesU * numFacesV * 6);
for(int y = 0; y < numFacesV; ++y)
for(int x = 0; x < numFacesU; ++x)
{
float4 tl = POINT_TO_FLOAT4(topLeft + uEdge * (float)x + vEdge * (float)y);
float4 tr = POINT_TO_FLOAT4(topLeft + uEdge * (float)(x+1) + vEdge * (float)y);
float4 bl = POINT_TO_FLOAT4(topLeft + uEdge * (float)x + vEdge * (float)(y+1));
float4 br = POINT_TO_FLOAT4(topLeft + uEdge * (float)(x+1) + vEdge * (float)(y+1));
int i0 = ccwIsFrontFacing ? i : i+5;
int i1 = ccwIsFrontFacing ? i+5 : i;
vb.Set(i0, VDPosition, tl);
vb.Set(i+1, VDPosition, tr);
vb.Set(i+2, VDPosition, bl);
vb.Set(i+3, VDPosition, bl);
vb.Set(i+4, VDPosition, tr);
vb.Set(i1, VDPosition, br);
if (vb.Declaration()->HasType(VDUV))
{
float4 uvTL((float)x/numFacesU, (float)y/numFacesV, 0.f, 1.f);
float4 uvTR((float)(x+1)/numFacesU, (float)y/numFacesV, 0.f, 1.f);
float4 uvBL((float)x/numFacesU, (float)(y+1)/numFacesV, 0.f, 1.f);
float4 uvBR((float)(x+1)/numFacesU, (float)(y+1)/numFacesV, 0.f, 1.f);
vb.Set(i0, VDUV, uvTL);
vb.Set(i+1, VDUV, uvTR);
vb.Set(i+2, VDUV, uvBL);
vb.Set(i+3, VDUV, uvBL);
vb.Set(i+4, VDUV, uvTR);
vb.Set(i1, VDUV, uvBR);
}
if (vb.Declaration()->HasType(VDNormal))
{
for(int k = 0; k < 6; ++k)
vb.Set(i+k, VDNormal, DIR_TO_FLOAT4(normal));
}
i += 6;
}
}
void Sphere::Triangulate(VertexBuffer &vb, int numVertices, bool ccwIsFrontFacing) const
{
Array<vec> position;
Array<vec> normal;
Array<float2> uv;
position.Resize_unspecified(numVertices);
normal.Resize_unspecified(numVertices);
uv.Resize_unspecified(numVertices);
Triangulate(position.ptr(), normal.ptr(), uv.ptr(), numVertices, ccwIsFrontFacing);
int startIndex = vb.AppendVertices(numVertices);
for(int i = 0; i < (int)position.size(); ++i)
{
vb.Set(startIndex+i, VDPosition, POINT_TO_FLOAT4(position[i]));
if (vb.Declaration()->TypeOffset(VDNormal) >= 0)
vb.Set(startIndex+i, VDNormal, DIR_TO_FLOAT4(normal[i]));
if (vb.Declaration()->TypeOffset(VDUV) >= 0)
vb.SetFloat2(startIndex+i, VDUV, 0, uv[i]);
}
}
void AABB::Triangulate(VertexBuffer &vb, int numFacesX, int numFacesY, int numFacesZ, bool ccwIsFrontFacing) const
{
Array<vec> pos;
Array<vec> normal;
Array<float2> uv;
int numVertices = (numFacesX*numFacesY + numFacesY*numFacesZ + numFacesX*numFacesZ)*2*6;
pos.Resize_pod(numVertices);
normal.Resize_pod(numVertices);
uv.Resize_pod(numVertices);
Triangulate(numFacesX, numFacesY, numFacesZ, &pos[0], &normal[0], &uv[0], ccwIsFrontFacing);
int startIndex = vb.AppendVertices(numVertices);
for(int i = 0; i < (int)pos.size(); ++i)
{
vb.Set(startIndex+i, VDPosition, POINT_TO_FLOAT4(pos[i]));
if (vb.Declaration()->TypeOffset(VDNormal) >= 0)
vb.Set(startIndex+i, VDNormal, DIR_TO_FLOAT4(normal[i]));
if (vb.Declaration()->TypeOffset(VDUV) >= 0)
vb.SetFloat2(startIndex+i, VDUV, 0, uv[i]);
}
}
