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first try of primitive restart index generator

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Convert all quads+triangles into trangle_strip and uses primitive restart to split them.
Speed up triangle_strip, but slows down all others primitive formats.
Only implemented in ogl.
This commit is contained in:
degasus
2013-03-29 14:27:33 +01:00
parent c743e75d92
commit ca8554e7d1
8 changed files with 102 additions and 33 deletions
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44
Source/Core/VideoCommon/Src/IndexGenerator.cpp
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@ -18,6 +18,7 @@
#include <cstddef>
#include "Common.h"
#include "VideoConfig.h"
#include "IndexGenerator.h"
/*
@ -90,7 +91,9 @@ __forceinline void IndexGenerator::WriteTriangle(u32 index1, u32 index2, u32 ind
*Tptr++ = index1;
*Tptr++ = index2;
*Tptr++ = index3;
if(g_Config.backend_info.bSupportsPrimitiveRestart)
*Tptr++ = 65535;
++numT;
}
@ -105,15 +108,25 @@ void IndexGenerator::AddList(u32 const numVerts)
void IndexGenerator::AddStrip(u32 const numVerts)
{
bool wind = false;
for (u32 i = 2; i < numVerts; ++i)
{
WriteTriangle(
index + i - 2,
index + i - !wind,
index + i - wind);
if(g_Config.backend_info.bSupportsPrimitiveRestart) {
for (u32 i = 0; i < numVerts; ++i)
{
*Tptr++ = index + i;
}
*Tptr++ = 65535;
numT += numVerts - 2;
} else {
bool wind = false;
for (u32 i = 2; i < numVerts; ++i)
{
WriteTriangle(
index + i - 2,
index + i - !wind,
index + i - wind);
wind ^= true;
wind ^= true;
}
}
}
@ -130,8 +143,17 @@ void IndexGenerator::AddQuads(u32 numVerts)
auto const numQuads = numVerts / 4;
for (u32 i = 0; i != numQuads; ++i)
{
WriteTriangle(index + i * 4, index + i * 4 + 1, index + i * 4 + 2);
WriteTriangle(index + i * 4, index + i * 4 + 2, index + i * 4 + 3);
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++ = 65535;
numT += 2;
} else {
WriteTriangle(index + i * 4, index + i * 4 + 1, index + i * 4 + 2);
WriteTriangle(index + i * 4, index + i * 4 + 2, index + i * 4 + 3);
}
}
}