[17] 楼梯(Stairs)图形的生成算法
感觉这图形怎么看怎么像搓衣板.
顶点数据的生成
bool YfBuildStairsVertices
(
Yreal width,
Yreal length,
Yreal height,
Yuint stacks,
YeOriginPose originPose,
Yuint vertexStriding,
Yuint vertexPos,
void* pVerticesBuffer
)
{
if (stacks < || !pVerticesBuffer)
{
return false;
}
Yuint numVertices = + stacks * ;
//Yuint numTriangles = stacks * 8; char* vertexPtr = (char*)pVerticesBuffer + vertexPos;
YsVector3* curVertexPtr = NULL;
Yuint nOffset = ; YsVector3 vOriginOffset(-width / , -height / , -length / );
if (originPose == YE_ORIGIN_POSE_TOP)
{
vOriginOffset.y = -height;
}
else if (originPose == YE_ORIGIN_POSE_BOTTOM)
{
vOriginOffset.y = 0.0f;
} Yreal fStepLength = length / stacks;
Yreal fStepHeight = height / stacks; for (Yuint i = ; i <= stacks; i++)
{
nOffset = i * * vertexStriding;
curVertexPtr = (YsVector3*)(vertexPtr + nOffset);
curVertexPtr->x = vOriginOffset.x;
curVertexPtr->y = i * fStepHeight + vOriginOffset.y;
curVertexPtr->z = i * fStepLength + vOriginOffset.z; nOffset += vertexStriding;
curVertexPtr = (YsVector3*)(vertexPtr + nOffset);
curVertexPtr->x = width + vOriginOffset.x;
curVertexPtr->y = i * fStepHeight + vOriginOffset.y;
curVertexPtr->z = i * fStepLength + vOriginOffset.z; if (i == stacks)
{
continue;
} nOffset += vertexStriding;
curVertexPtr = (YsVector3*)(vertexPtr + nOffset);
curVertexPtr->x = vOriginOffset.x;
curVertexPtr->y = (i+) * fStepHeight + vOriginOffset.y;
curVertexPtr->z = i * fStepLength + vOriginOffset.z; nOffset += vertexStriding;
curVertexPtr = (YsVector3*)(vertexPtr + nOffset);
curVertexPtr->x = width + vOriginOffset.x;
curVertexPtr->y = (i+) * fStepHeight + vOriginOffset.y;
curVertexPtr->z = i * fStepLength + vOriginOffset.z;
} return true;
}
三角形索引数据的生成
bool YfBuildStairsTriIndices
(
Yuint stacks,
YeIndexType indexType,
Yuint indexStriding,
Yuint indexPos,
void* pTriIndicesBuffer
)
{
if (stacks < || !pTriIndicesBuffer)
{
return false;
}
Yuint numVertices = + stacks * ;
Yuint numTriangles = stacks * ;
if (indexType == YE_INDEX_16_BIT &&
numVertices > YD_MAX_UNSIGNED_INT16)
{
return false;
} // 索引赋值
char* indexPtr = (char*)pTriIndicesBuffer + indexPos;
Yuint nOffset = ;
if (indexType == YE_INDEX_16_BIT)
{
YsTriIndex16* triIndexPtr = NULL;
for (Yuint i = ; i < stacks; i++)
{
nOffset = * i * indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ;
}
}
else
{
YsTriIndex32* triIndexPtr = NULL;
for (Yuint i = ; i < stacks; i++)
{
nOffset = * i * indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ; nOffset += indexStriding;
triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);
triIndexPtr->index0 = i* + ;
triIndexPtr->index1 = i* + ;
triIndexPtr->index2 = i* + ;
}
} return true;
}
线框索引数据的生成
bool YfBuildStairsWireIndices
(
Yuint stacks,
YeIndexType indexType,
Yuint indexStriding,
Yuint indexPos,
void* pWireIndicesBuffer
)
{
if (stacks < || !pWireIndicesBuffer)
{
return false;
} Yuint numVertices = + stacks * ;
Yuint numLines = + stacks * ;
if (indexType == YE_INDEX_16_BIT &&
numVertices > YD_MAX_UNSIGNED_INT16)
{
return false;
} // 索引赋值
char* indexPtr = (char*)pWireIndicesBuffer + indexPos;
Yuint nOffset = ;
if (indexType == YE_INDEX_16_BIT)
{
YsLineIndex16* lineIndexPtr = NULL;
for (Yuint i = ; i < stacks; i++)
{
nOffset = (i * ) * indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
nOffset += indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
} nOffset = (stacks * ) * indexStriding;
lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);
lineIndexPtr->index0 = stacks * ;
lineIndexPtr->index1 = stacks * + ;
}
else
{
YsLineIndex32* lineIndexPtr = NULL;
for (Yuint i = ; i < stacks; i++)
{
nOffset = (i * ) * indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ; nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
nOffset += indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = i * + ;
lineIndexPtr->index1 = i * + ;
} nOffset = (stacks * ) * indexStriding;
lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);
lineIndexPtr->index0 = stacks * ;
lineIndexPtr->index1 = stacks * + ;
} return true;
}
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