[12] 扇形体(Fan)图形的生成算法

顶点数据的生成

 bool                        YfBuildFunVertices

 (

     Yreal                   radius,

     Yreal                   degree,

     Yreal                   height,

     Yuint                   slices,

     YeOriginPose            originPose,

     Yuint                   vertexStriding,

     Yuint                   vertexPos,

     void*                   pVerticesBuffer

 )

 {

     if (degree <  || degree >  || !pVerticesBuffer)

     {

         return false;

     }

     if (slices <  || !pVerticesBuffer)

     {

         return false;

     }

     Yuint numVertices  = (slices + ) * ;

     char* vertexPtr = (char*)pVerticesBuffer + vertexPos;

     YsVector3* curVertexPtr   = NULL;

     Yuint nOffset = ;

     Yreal originOffsetY = 0.0f;

     if (originPose == YE_ORIGIN_POSE_TOP)

     {

         originOffsetY = -height;

     }

     else if (originPose == YE_ORIGIN_POSE_CENTER)

     {

         originOffsetY = -height * 0.5f;

     }

     // 柱顶顶点赋值

     {

         nOffset = ;

         curVertexPtr = (YsVector3*)(vertexPtr + nOffset);

         curVertexPtr->x = 0.0f;

         curVertexPtr->y = height + originOffsetY;

         curVertexPtr->z = 0.0f;

     }

     // 柱底顶点赋值

     {

         nOffset = (numVertices - ) * vertexStriding;

         curVertexPtr = (YsVector3*)(vertexPtr + nOffset);

         curVertexPtr->x = 0.0f;

         curVertexPtr->y = originOffsetY;

         curVertexPtr->z = 0.0f;

     }

     Yreal radian = YD_DEGREE_TO_RADIAN(degree);

     Yreal angleXZ;

     Yreal posX, posZ;

     for (Yuint i = ; i < slices; i++)

     {

         angleXZ = radian * i / (slices - );

         posX = yf_sin(angleXZ);

         posZ = yf_cos(angleXZ);

         // 上顶点

         {

             nOffset = ( + i) * vertexStriding;

             curVertexPtr = (YsVector3*)(vertexPtr + nOffset);

             curVertexPtr->x = radius * posX;

             curVertexPtr->y = height + originOffsetY;

             curVertexPtr->z = radius * posZ;

         }

         // 下顶点

         {

             nOffset = ( + slices + i) * vertexStriding;

             curVertexPtr = (YsVector3*)(vertexPtr + nOffset);

             curVertexPtr->x = radius * posX;

             curVertexPtr->y = originOffsetY;

             curVertexPtr->z = radius * posZ;

         }

     }

     return true;

 }

三角形索引数据的生成

 bool                        YfBuildFunTriIndices

 (

     Yuint                   slices,

     YeIndexType             indexType,

     Yuint                   indexStriding,

     Yuint                   indexPos,

     void*                   pTriIndicesBuffer

 )

 {

     if (slices <  || !pTriIndicesBuffer)

     {

         return false;

     }

     Yuint numVertices  = (slices + ) * ;

     Yuint numTriangles = slices * ;

     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 < slices - ; i++)

         {

             nOffset = (i * ) * indexStriding;

             triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);

             triIndexPtr->index0 = ;

             triIndexPtr->index1 =  + i;

             triIndexPtr->index2 =  + i + ;

             nOffset += indexStriding;

             triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);

             triIndexPtr->index0 = numVertices - ;

             triIndexPtr->index1 =  + slices + i + ;

             triIndexPtr->index2 =  + slices + i;

             nOffset += indexStriding;

             triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);

             triIndexPtr->index0 =  + i;

             triIndexPtr->index1 =  + slices + i;

             triIndexPtr->index2 =  + i + ;

             nOffset += indexStriding;

             triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);

             triIndexPtr->index0 =  + i + ;

             triIndexPtr->index1 =  + slices + i;

             triIndexPtr->index2 =  + slices + i + ;

         }

         nOffset = ((slices - ) * ) * indexStriding;

         triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);

         triIndexPtr->index0 = ;

         triIndexPtr->index1 = numVertices - ;

         triIndexPtr->index2 = ;

         nOffset += indexStriding;

         triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);

         triIndexPtr->index0 = ;

         triIndexPtr->index1 = numVertices - ;

         triIndexPtr->index2 =  + slices;

         nOffset += indexStriding;

         triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);

         triIndexPtr->index0 = ;

         triIndexPtr->index1 = slices;

         triIndexPtr->index2 = numVertices - ;

         nOffset += indexStriding;

         triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset);

         triIndexPtr->index0 = slices;

         triIndexPtr->index1 = numVertices - ;

         triIndexPtr->index2 = numVertices - ;

     }

     else

     {

         YsTriIndex32* triIndexPtr = NULL;

         for (Yuint i = ; i < slices - ; i++)

         {

             nOffset = (i * ) * indexStriding;

             triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);

             triIndexPtr->index0 = ;

             triIndexPtr->index1 =  + i;

             triIndexPtr->index2 =  + i + ;

             nOffset += indexStriding;

             triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);

             triIndexPtr->index0 = numVertices - ;

             triIndexPtr->index1 =  + slices + i + ;

             triIndexPtr->index2 =  + slices + i;

             nOffset += indexStriding;

             triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);

             triIndexPtr->index0 =  + i;

             triIndexPtr->index1 =  + slices + i;

             triIndexPtr->index2 =  + i + ;

             nOffset += indexStriding;

             triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);

             triIndexPtr->index0 =  + i + ;

             triIndexPtr->index1 =  + slices + i;

             triIndexPtr->index2 =  + slices + i + ;

         }

         nOffset = ((slices - ) * ) * indexStriding;

         triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);

         triIndexPtr->index0 = ;

         triIndexPtr->index1 = numVertices - ;

         triIndexPtr->index2 = ;

         nOffset += indexStriding;

         triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);

         triIndexPtr->index0 = ;

         triIndexPtr->index1 = numVertices - ;

         triIndexPtr->index2 =  + slices;

         nOffset += indexStriding;

         triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);

         triIndexPtr->index0 = ;

         triIndexPtr->index1 = slices;

         triIndexPtr->index2 = numVertices - ;

         nOffset += indexStriding;

         triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);

         triIndexPtr->index0 = slices;

         triIndexPtr->index1 = numVertices - ;

         triIndexPtr->index2 = numVertices - ;

     }

     return true;

 }

线框索引数据的生成

 bool                        YfBuildFunWireIndices

 (

     Yuint                   slices,

     YeIndexType             indexType,

     Yuint                   indexStriding,

     Yuint                   indexPos,

     void*                   pWireIndicesBuffer

 )

 {

     if (slices <  || !pWireIndicesBuffer)

     {

         return false;

     }

     Yuint numVertices = (slices + ) * ;

     Yuint numLines    = slices + (slices-) *  + ;

     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 < slices - ; i++)

         {

             nOffset = (i * ) * indexStriding;

             lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

             lineIndexPtr->index0 =  + i;

             lineIndexPtr->index1 =  + slices + i;

             nOffset += indexStriding;

             lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

             lineIndexPtr->index0 =  + i;

             lineIndexPtr->index1 =  + i + ;

             nOffset += indexStriding;

             lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

             lineIndexPtr->index0 =  + slices + i;

             lineIndexPtr->index1 =  + slices + i + ;

         }

         nOffset += indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = slices;

         lineIndexPtr->index1 = *slices;

         nOffset += indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = *slices + ;

         nOffset += indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = ;

         nOffset += indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = ;

         lineIndexPtr->index1 = slices;

         nOffset += indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = *slices + ;

         lineIndexPtr->index1 = slices + ;

         nOffset += indexStriding;

         lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset);

         lineIndexPtr->index0 = *slices + ;

         lineIndexPtr->index1 = *slices;

     }

     else

     {

         YsLineIndex32* lineIndexPtr = NULL;

         for (Yuint i= ; i < slices; i++)

         {

             YsLineIndex32* lineIndexPtr = NULL;

             for (Yuint i = ; i < slices - ; i++)

             {

                 nOffset = (i * ) * indexStriding;

                 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

                 lineIndexPtr->index0 =  + i;

                 lineIndexPtr->index1 =  + slices + i;

                 nOffset += indexStriding;

                 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

                 lineIndexPtr->index0 =  + i;

                 lineIndexPtr->index1 =  + i + ;

                 nOffset += indexStriding;

                 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

                 lineIndexPtr->index0 =  + slices + i;

                 lineIndexPtr->index1 =  + slices + i + ;

             }

             nOffset += indexStriding;

             lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

             lineIndexPtr->index0 = slices;

             lineIndexPtr->index1 = *slices;

             nOffset += indexStriding;

             lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

             lineIndexPtr->index0 = ;

             lineIndexPtr->index1 = *slices + ;

             nOffset += indexStriding;

             lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

             lineIndexPtr->index0 = ;

             lineIndexPtr->index1 = ;

             nOffset += indexStriding;

             lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

             lineIndexPtr->index0 = ;

             lineIndexPtr->index1 = slices;

             nOffset += indexStriding;

             lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

             lineIndexPtr->index0 = *slices + ;

             lineIndexPtr->index1 = slices + ;

             nOffset += indexStriding;

             lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);

             lineIndexPtr->index0 = *slices + ;

             lineIndexPtr->index1 = *slices;

         }

     }

     return true;

 }

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[12] 扇形体(Fan)图形的生成算法

[12] 扇形体(Fan)图形的生成算法的更多相关文章

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