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convert triangle_fan to triangle_strip

This commit is contained in:
degasus 2013-04-08 17:22:16 +02:00
parent cf98ef8cf3
commit 80b56ddd17
1 changed files with 59 additions and 12 deletions
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71
Source/Core/VideoCommon/Src/IndexGenerator.cpp
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@ -21,15 +21,6 @@
#include "VideoConfig.h"
#include "IndexGenerator.h"
/*
*
QUAD simulator
0 1 4 5
3 2 7 6
012023 147172 ...
*/
//Init
u16 *IndexGenerator::Tptr;
u16 *IndexGenerator::BASETptr;
@ -130,24 +121,80 @@ void IndexGenerator::AddStrip(u32 const numVerts)
}
}
/**
* FAN simulator:
*
* 2---3
* / \ / \
* 1---0---4
*
* would generate this triangles:
* 012, 023, 034
*
* rotated (for better striping):
* 120, 302, 034
*
* as odd ones have to winded, following strip is fine:
* 12034
*
* so we use 6 indices for 3 triangles
*/
void IndexGenerator::AddFan(u32 numVerts)
{
for (u32 i = 2; i < numVerts; ++i)
ERROR_LOG(VIDEO, "addfan: %d vertices", numVerts);
u32 i = 2;
if(g_Config.backend_info.bSupportsPrimitiveRestart) {
for(; i<=numVerts-3; i+=3) {
*Tptr++ = index + i - 1;
*Tptr++ = index + i + 0;
*Tptr++ = index;
*Tptr++ = index + i + 1;
*Tptr++ = index + i + 2;
*Tptr++ = 65535;
numT += 3;
}
for(; i<=numVerts-2; i+=2) {
*Tptr++ = index + i - 1;
*Tptr++ = index + i + 0;
*Tptr++ = index;
*Tptr++ = index + i + 1;
*Tptr++ = 65535;
numT += 2;
}
}
for (; i < numVerts; ++i)
{
WriteTriangle(index, index + i - 1, index + i);
}
}
/*
* QUAD simulator
*
* 0---1 4---5
* |\ | |\ |
* | \ | | \ |
* | \| | \|
* 3---2 7---6
*
* 012,023, 456,467 ...
* or 120,302, 564,746
* or as strip: 1203, 5647
*/
void IndexGenerator::AddQuads(u32 numVerts)
{
auto const numQuads = numVerts / 4;
for (u32 i = 0; i != numQuads; ++i)
{
if(g_Config.backend_info.bSupportsPrimitiveRestart) {
*Tptr++ = index + i * 4 + 0;
*Tptr++ = index + i * 4 + 1;
*Tptr++ = index + i * 4 + 3;
*Tptr++ = index + i * 4 + 2;
*Tptr++ = index + i * 4 + 0;
*Tptr++ = index + i * 4 + 3;
*Tptr++ = 65535;
numT += 2;
} else {