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using System;
namespace Ryujinx.Graphics
{
static class QuadHelper
{
public static int ConvertSizeQuadsToTris(int Size)
{
return Size <= 0 ? 0 : (Size / 4) * 6;
}
public static int ConvertSizeQuadStripToTris(int Size)
{
return Size <= 1 ? 0 : ((Size - 2) / 2) * 6;
}
public static byte[] ConvertQuadsToTris(byte[] Data, int EntrySize, int Count)
{
int PrimitivesCount = Count / 4;
int QuadPrimSize = 4 * EntrySize;
int TrisPrimSize = 6 * EntrySize;
byte[] Output = new byte[PrimitivesCount * 6 * EntrySize];
for (int Prim = 0; Prim < PrimitivesCount; Prim++)
{
void AssignIndex(int Src, int Dst, int CopyCount = 1)
{
Src = Prim * QuadPrimSize + Src * EntrySize;
Dst = Prim * TrisPrimSize + Dst * EntrySize;
Buffer.BlockCopy(Data, Src, Output, Dst, CopyCount * EntrySize);
}
//0 1 2 -> 0 1 2.
AssignIndex(0, 0, 3);
//2 3 -> 3 4.
AssignIndex(2, 3, 2);
//0 -> 5.
AssignIndex(0, 5);
}
return Output;
}
public static byte[] ConvertQuadStripToTris(byte[] Data, int EntrySize, int Count)
{
int PrimitivesCount = (Count - 2) / 2;
int QuadPrimSize = 2 * EntrySize;
int TrisPrimSize = 6 * EntrySize;
byte[] Output = new byte[PrimitivesCount * 6 * EntrySize];
for (int Prim = 0; Prim < PrimitivesCount; Prim++)
{
void AssignIndex(int Src, int Dst, int CopyCount = 1)
{
Src = Prim * QuadPrimSize + Src * EntrySize + 2 * EntrySize;
Dst = Prim * TrisPrimSize + Dst * EntrySize;
Buffer.BlockCopy(Data, Src, Output, Dst, CopyCount * EntrySize);
}
//-2 -1 0 -> 0 1 2.
AssignIndex(-2, 0, 3);
//0 1 -> 3 4.
AssignIndex(0, 3, 2);
//-2 -> 5.
AssignIndex(-2, 5);
}
return Output;
}
}
}
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