1 bool YfBuildFunVertices 2 ( 3 Yreal radius, 4 Yreal degree, 5 Yreal height, 6 Yuint slices, 7 YeOriginPose originPose, 8 Yuint vertexStriding, 9 Yuint vertexPos,10 void* pVerticesBuffer11 )12 {13 if (degree < 0 || degree > 360 || !pVerticesBuffer)14 {15 return false;16 }17 if (slices < 2 || !pVerticesBuffer)18 {19 return false;20 }21 22 Yuint numVertices = (slices + 1) * 2;23 24 char* vertexPtr = (char*)pVerticesBuffer + vertexPos;25 YsVector3* curVertexPtr = NULL;26 Yuint nOffset = 0;27 28 Yreal originOffsetY = 0.0f;29 if (originPose == YE_ORIGIN_POSE_TOP)30 {31 originOffsetY = -height;32 }33 else if (originPose == YE_ORIGIN_POSE_CENTER)34 {35 originOffsetY = -height * 0.5f;36 }37 38 // 柱顶顶点赋值39 {40 nOffset = 0; 41 curVertexPtr = (YsVector3*)(vertexPtr + nOffset);42 curVertexPtr->x = 0.0f;43 curVertexPtr->y = height + originOffsetY;44 curVertexPtr->z = 0.0f;45 }46 47 // 柱底顶点赋值48 {49 nOffset = (numVertices - 1) * vertexStriding; 50 curVertexPtr = (YsVector3*)(vertexPtr + nOffset);51 curVertexPtr->x = 0.0f;52 curVertexPtr->y = originOffsetY;53 curVertexPtr->z = 0.0f;54 }55 56 Yreal radian = YD_DEGREE_TO_RADIAN(degree);57 Yreal angleXZ;58 Yreal posX, posZ; 59 for (Yuint i = 0; i < slices; i++)60 {61 angleXZ = radian * i / (slices - 1);62 posX = yf_sin(angleXZ);63 posZ = yf_cos(angleXZ);64 65 // 上顶点66 {67 nOffset = (1 + i) * vertexStriding; 68 curVertexPtr = (YsVector3*)(vertexPtr + nOffset);69 curVertexPtr->x = radius * posX;70 curVertexPtr->y = height + originOffsetY;71 curVertexPtr->z = radius * posZ;72 }73 74 // 下顶点75 {76 nOffset = (1 + slices + i) * vertexStriding; 77 curVertexPtr = (YsVector3*)(vertexPtr + nOffset);78 curVertexPtr->x = radius * posX;79 curVertexPtr->y = originOffsetY;80 curVertexPtr->z = radius * posZ;81 }82 }83 84 return true;85 }
三角形索引数据的生成
1 bool YfBuildFunTriIndices 2 ( 3 Yuint slices, 4 YeIndexType indexType, 5 Yuint indexStriding, 6 Yuint indexPos, 7 void* pTriIndicesBuffer 8 ) 9 { 10 if (slices < 2 || !pTriIndicesBuffer) 11 { 12 return false; 13 } 14 15 Yuint numVertices = (slices + 1) * 2; 16 Yuint numTriangles = slices * 4; 17 if (indexType == YE_INDEX_16_BIT && 18 numVertices > YD_MAX_UNSIGNED_INT16) 19 { 20 return false; 21 } 22 23 // 索引赋值 24 char* indexPtr = (char*)pTriIndicesBuffer + indexPos; 25 Yuint nOffset = 0; 26 if (indexType == YE_INDEX_16_BIT) 27 { 28 YsTriIndex16* triIndexPtr = NULL; 29 for (Yuint i = 0; i < slices - 1; i++) 30 { 31 nOffset = (i * 4) * indexStriding; 32 triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset); 33 triIndexPtr->index0 = 0; 34 triIndexPtr->index1 = 1 + i; 35 triIndexPtr->index2 = 1 + i + 1; 36 37 nOffset += indexStriding; 38 triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset); 39 triIndexPtr->index0 = numVertices - 1; 40 triIndexPtr->index1 = 1 + slices + i + 1; 41 triIndexPtr->index2 = 1 + slices + i; 42 43 nOffset += indexStriding; 44 triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset); 45 triIndexPtr->index0 = 1 + i; 46 triIndexPtr->index1 = 1 + slices + i; 47 triIndexPtr->index2 = 1 + i + 1; 48 49 nOffset += indexStriding; 50 triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset); 51 triIndexPtr->index0 = 1 + i + 1; 52 triIndexPtr->index1 = 1 + slices + i; 53 triIndexPtr->index2 = 1 + slices + i + 1; 54 } 55 56 nOffset = ((slices - 1) * 4) * indexStriding; 57 triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset); 58 triIndexPtr->index0 = 0; 59 triIndexPtr->index1 = numVertices - 1; 60 triIndexPtr->index2 = 1; 61 62 nOffset += indexStriding; 63 triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset); 64 triIndexPtr->index0 = 1; 65 triIndexPtr->index1 = numVertices - 1; 66 triIndexPtr->index2 = 1 + slices; 67 68 nOffset += indexStriding; 69 triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset); 70 triIndexPtr->index0 = 0; 71 triIndexPtr->index1 = slices; 72 triIndexPtr->index2 = numVertices - 1; 73 74 nOffset += indexStriding; 75 triIndexPtr = (YsTriIndex16*)(indexPtr + nOffset); 76 triIndexPtr->index0 = slices; 77 triIndexPtr->index1 = numVertices - 2; 78 triIndexPtr->index2 = numVertices - 1; 79 } 80 else 81 { 82 YsTriIndex32* triIndexPtr = NULL; 83 for (Yuint i = 0; i < slices - 1; i++) 84 { 85 nOffset = (i * 4) * indexStriding; 86 triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset); 87 triIndexPtr->index0 = 0; 88 triIndexPtr->index1 = 1 + i; 89 triIndexPtr->index2 = 1 + i + 1; 90 91 nOffset += indexStriding; 92 triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset); 93 triIndexPtr->index0 = numVertices - 1; 94 triIndexPtr->index1 = 1 + slices + i + 1; 95 triIndexPtr->index2 = 1 + slices + i; 96 97 nOffset += indexStriding; 98 triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset); 99 triIndexPtr->index0 = 1 + i;100 triIndexPtr->index1 = 1 + slices + i;101 triIndexPtr->index2 = 1 + i + 1;102 103 nOffset += indexStriding;104 triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);105 triIndexPtr->index0 = 1 + i + 1;106 triIndexPtr->index1 = 1 + slices + i;107 triIndexPtr->index2 = 1 + slices + i + 1;108 }109 110 nOffset = ((slices - 1) * 4) * indexStriding;111 triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);112 triIndexPtr->index0 = 0;113 triIndexPtr->index1 = numVertices - 1;114 triIndexPtr->index2 = 1;115 116 nOffset += indexStriding;117 triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);118 triIndexPtr->index0 = 1;119 triIndexPtr->index1 = numVertices - 1;120 triIndexPtr->index2 = 1 + slices;121 122 nOffset += indexStriding;123 triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);124 triIndexPtr->index0 = 0;125 triIndexPtr->index1 = slices;126 triIndexPtr->index2 = numVertices - 1;127 128 nOffset += indexStriding;129 triIndexPtr = (YsTriIndex32*)(indexPtr + nOffset);130 triIndexPtr->index0 = slices;131 triIndexPtr->index1 = numVertices - 2;132 triIndexPtr->index2 = numVertices - 1;133 }134 135 return true;136 }
线框索引数据的生成
1 bool YfBuildFunWireIndices 2 ( 3 Yuint slices, 4 YeIndexType indexType, 5 Yuint indexStriding, 6 Yuint indexPos, 7 void* pWireIndicesBuffer 8 ) 9 { 10 if (slices < 2 || !pWireIndicesBuffer) 11 { 12 return false; 13 } 14 15 Yuint numVertices = (slices + 1) * 2; 16 Yuint numLines = slices + (slices-1) * 2 + 5; 17 if (indexType == YE_INDEX_16_BIT && 18 numVertices > YD_MAX_UNSIGNED_INT16) 19 { 20 return false; 21 } 22 23 // 索引赋值 24 char* indexPtr = (char*)pWireIndicesBuffer + indexPos; 25 Yuint nOffset = 0; 26 if (indexType == YE_INDEX_16_BIT) 27 { 28 YsLineIndex16* lineIndexPtr = NULL; 29 for (Yuint i = 0; i < slices - 1; i++) 30 { 31 nOffset = (i * 3) * indexStriding; 32 lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset); 33 lineIndexPtr->index0 = 1 + i; 34 lineIndexPtr->index1 = 1 + slices + i; 35 36 nOffset += indexStriding; 37 lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset); 38 lineIndexPtr->index0 = 1 + i; 39 lineIndexPtr->index1 = 1 + i + 1; 40 41 nOffset += indexStriding; 42 lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset); 43 lineIndexPtr->index0 = 1 + slices + i; 44 lineIndexPtr->index1 = 1 + slices + i + 1; 45 } 46 47 nOffset += indexStriding; 48 lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset); 49 lineIndexPtr->index0 = slices; 50 lineIndexPtr->index1 = 2*slices; 51 52 nOffset += indexStriding; 53 lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset); 54 lineIndexPtr->index0 = 0; 55 lineIndexPtr->index1 = 2*slices + 1; 56 57 nOffset += indexStriding; 58 lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset); 59 lineIndexPtr->index0 = 0; 60 lineIndexPtr->index1 = 1; 61 62 nOffset += indexStriding; 63 lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset); 64 lineIndexPtr->index0 = 0; 65 lineIndexPtr->index1 = slices; 66 67 nOffset += indexStriding; 68 lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset); 69 lineIndexPtr->index0 = 2*slices + 1; 70 lineIndexPtr->index1 = slices + 1; 71 72 nOffset += indexStriding; 73 lineIndexPtr = (YsLineIndex16*)(indexPtr + nOffset); 74 lineIndexPtr->index0 = 2*slices + 1; 75 lineIndexPtr->index1 = 2*slices; 76 } 77 else 78 { 79 YsLineIndex32* lineIndexPtr = NULL; 80 for (Yuint i= 0; i < slices; i++) 81 { 82 YsLineIndex32* lineIndexPtr = NULL; 83 for (Yuint i = 0; i < slices - 1; i++) 84 { 85 nOffset = (i * 3) * indexStriding; 86 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset); 87 lineIndexPtr->index0 = 1 + i; 88 lineIndexPtr->index1 = 1 + slices + i; 89 90 nOffset += indexStriding; 91 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset); 92 lineIndexPtr->index0 = 1 + i; 93 lineIndexPtr->index1 = 1 + i + 1; 94 95 nOffset += indexStriding; 96 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset); 97 lineIndexPtr->index0 = 1 + slices + i; 98 lineIndexPtr->index1 = 1 + slices + i + 1; 99 }100 101 nOffset += indexStriding;102 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);103 lineIndexPtr->index0 = slices;104 lineIndexPtr->index1 = 2*slices;105 106 nOffset += indexStriding;107 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);108 lineIndexPtr->index0 = 0;109 lineIndexPtr->index1 = 2*slices + 1;110 111 nOffset += indexStriding;112 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);113 lineIndexPtr->index0 = 0;114 lineIndexPtr->index1 = 1;115 116 nOffset += indexStriding;117 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);118 lineIndexPtr->index0 = 0;119 lineIndexPtr->index1 = slices;120 121 nOffset += indexStriding;122 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);123 lineIndexPtr->index0 = 2*slices + 1;124 lineIndexPtr->index1 = slices + 1;125 126 nOffset += indexStriding;127 lineIndexPtr = (YsLineIndex32*)(indexPtr + nOffset);128 lineIndexPtr->index0 = 2*slices + 1;129 lineIndexPtr->index1 = 2*slices;130 }131 }132 133 return true;134 }