113 lines
1.9 KiB
C++
113 lines
1.9 KiB
C++
#include "stdafx.h"
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#include "IndexGenerator.h"
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/*
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*
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QUAD simulator
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0 2 4 6
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1 3 5 7
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021231 243453
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*/
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void IndexGenerator::Start(unsigned short *startptr)
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{
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ptr=startptr;
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index=0;
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numPrims=0;
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}
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void IndexGenerator::AddList(int numVerts)
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{
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int numTris = numVerts/3;
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if (numTris<=0) return;
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for (int i=0; i<numTris; i++)
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{
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*ptr++ = index+i*3;
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*ptr++ = index+i*3+1;
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*ptr++ = index+i*3+2;
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}
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index += numVerts;
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numPrims += numTris;
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}
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void IndexGenerator::AddStrip(int numVerts)
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{
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int numTris = numVerts-2;
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if (numTris<=0) return;
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bool wind = false;
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for (int i=0; i<numTris; i++)
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{
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*ptr++ = index+i;
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*ptr++ = index+i+(wind?2:1);
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*ptr++ = index+i+(wind?1:2);
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wind = !wind;
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}
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index += numVerts;
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numPrims += numTris;
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}
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void IndexGenerator::AddLineList(int numVerts)
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{
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int numLines= numVerts/2;
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if (numLines<=0) return;
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for (int i=0; i<numLines; i++)
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{
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*ptr++ = index+i*2;
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*ptr++ = index+i*2+1;
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}
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index += numVerts;
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numPrims += numLines;
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}
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void IndexGenerator::AddLineStrip(int numVerts)
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{
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int numLines = numVerts-1;
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if (numLines<=0) return;
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for (int i=0; i<numLines; i++)
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{
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*ptr++ = index+i;
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*ptr++ = index+i+1;
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}
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index += numVerts;
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numPrims += numLines;
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}
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void IndexGenerator::AddFan(int numVerts)
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{
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int numTris = numVerts-2;
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if (numTris<=0) return;
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for (int i=0; i<numTris; i++)
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{
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*ptr++ = index;
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*ptr++ = index+i+1;
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*ptr++ = index+i+2;
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}
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index += numVerts;
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numPrims += numTris;
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}
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void IndexGenerator::AddQuads(int numVerts)
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{
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int numTris = (numVerts/4)*2;
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if (numTris<=0) return;
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for (int i=0; i<numTris/2; i++)
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{
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*ptr++=index+i*4;
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*ptr++=index+i*4+1;
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*ptr++=index+i*4+3;
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*ptr++=index+i*4+1;
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*ptr++=index+i*4+2;
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*ptr++=index+i*4+3;
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}
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index += numVerts;
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numPrims += numTris;
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}
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void IndexGenerator::AddPointList(int numVerts)
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{
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index += numVerts;
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} |