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// Copyright (C) 2003 Dolphin Project.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License 2.0 for more details.
// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/
// Official SVN repository and contact information can be found at
// http://code.google.com/p/dolphin-emu/
#include "IndexGenerator.h"
/*
*
QUAD simulator
0 2 4 6
1 3 5 7
021231 243453
*/
void IndexGenerator::Start(unsigned short *startptr)
{
ptr = startptr;
index = 0;
numPrims = 0;
}
void IndexGenerator::AddList(int numVerts)
{
int numTris = numVerts / 3;
if (numTris <= 0) return;
for (int i = 0; i < numTris; i++)
{
*ptr++ = index+i*3;
*ptr++ = index+i*3+1;
*ptr++ = index+i*3+2;
}
index += numVerts;
numPrims += numTris;
}
void IndexGenerator::AddStrip(int numVerts)
{
int numTris = numVerts - 2;
if (numTris <= 0) return;
bool wind = false;
for (int i = 0; i < numTris; i++)
{
*ptr++ = index+i;
*ptr++ = index+i+(wind?2:1);
*ptr++ = index+i+(wind?1:2);
wind = !wind;
}
index += numVerts;
numPrims += numTris;
}
void IndexGenerator::AddLineList(int numVerts)
{
int numLines= numVerts / 2;
if (numLines <= 0) return;
for (int i = 0; i < numLines; i++)
{
*ptr++ = index+i*2;
*ptr++ = index+i*2+1;
}
index += numVerts;
numPrims += numLines;
}
void IndexGenerator::AddLineStrip(int numVerts)
{
int numLines = numVerts - 1;
if (numLines <= 0) return;
for (int i = 0; i < numLines; i++)
{
*ptr++ = index+i;
*ptr++ = index+i+1;
}
index += numVerts;
numPrims += numLines;
}
void IndexGenerator::AddFan(int numVerts)
{
int numTris = numVerts - 2;
if (numTris <= 0) return;
for (int i = 0; i < numTris; i++)
{
*ptr++ = index;
*ptr++ = index+i+1;
*ptr++ = index+i+2;
}
index += numVerts;
numPrims += numTris;
}
void IndexGenerator::AddQuads(int numVerts)
{
int numTris = (numVerts/4)*2;
if (numTris <= 0) return;
for (int i = 0; i < numTris / 2; i++)
{
*ptr++ = index+i*4;
*ptr++ = index+i*4+1;
*ptr++ = index+i*4+3;
*ptr++ = index+i*4+1;
*ptr++ = index+i*4+2;
*ptr++ = index+i*4+3;
}
index += numVerts;
numPrims += numTris;
}
void IndexGenerator::AddPointList(int numVerts)
{
index += numVerts;
}
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