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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 <cstddef>
#include "Common.h"
#include "IndexGenerator.h"
/*
*
QUAD simulator
0 1 4 5
3 2 7 6
012023 147172 ...
*/
//Init
u16 *IndexGenerator::Tptr;
u16 *IndexGenerator::BASETptr;
u16 *IndexGenerator::Lptr;
u16 *IndexGenerator::BASELptr;
u16 *IndexGenerator::Pptr;
u16 *IndexGenerator::BASEPptr;
u32 IndexGenerator::numT;
u32 IndexGenerator::numL;
u32 IndexGenerator::numP;
u32 IndexGenerator::index;
void IndexGenerator::Start(u16* Triangleptr, u16* Lineptr, u16* Pointptr)
{
Tptr = Triangleptr;
Lptr = Lineptr;
Pptr = Pointptr;
BASETptr = Triangleptr;
BASELptr = Lineptr;
BASEPptr = Pointptr;
index = 0;
numT = 0;
numL = 0;
numP = 0;
}
void IndexGenerator::AddIndices(int primitive, u32 numVerts)
{
//switch (primitive)
//{
//case GX_DRAW_QUADS: IndexGenerator::AddQuads(numVerts); break;
//case GX_DRAW_TRIANGLES: IndexGenerator::AddList(numVerts); break;
//case GX_DRAW_TRIANGLE_STRIP: IndexGenerator::AddStrip(numVerts); break;
//case GX_DRAW_TRIANGLE_FAN: IndexGenerator::AddFan(numVerts); break;
//case GX_DRAW_LINES: IndexGenerator::AddLineList(numVerts); break;
//case GX_DRAW_LINE_STRIP: IndexGenerator::AddLineStrip(numVerts); break;
//case GX_DRAW_POINTS: IndexGenerator::AddPoints(numVerts); break;
//}
static void (*const primitive_table[])(u32) =
{
IndexGenerator::AddQuads,
NULL,
IndexGenerator::AddList,
IndexGenerator::AddStrip,
IndexGenerator::AddFan,
IndexGenerator::AddLineList,
IndexGenerator::AddLineStrip,
IndexGenerator::AddPoints,
};
primitive_table[primitive](numVerts);
index += numVerts;
}
// Triangles
__forceinline void IndexGenerator::WriteTriangle(u32 index1, u32 index2, u32 index3)
{
*Tptr++ = index1;
*Tptr++ = index2;
*Tptr++ = index3;
++numT;
}
void IndexGenerator::AddList(u32 const numVerts)
{
auto const numTris = numVerts / 3;
for (u32 i = 0; i != numTris; ++i)
{
WriteTriangle(index + i * 3, index + i * 3 + 1, index + i * 3 + 2);
}
}
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);
wind ^= true;
}
}
void IndexGenerator::AddFan(u32 numVerts)
{
for (u32 i = 2; i < numVerts; ++i)
{
WriteTriangle(index, index + i - 1, index + i);
}
}
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);
}
}
// Lines
void IndexGenerator::AddLineList(u32 numVerts)
{
auto const numLines = numVerts / 2;
for (u32 i = 0; i != numLines; ++i)
{
*Lptr++ = index + i * 2;
*Lptr++ = index + i * 2 + 1;
++numL;
}
}
void IndexGenerator::AddLineStrip(u32 numVerts)
{
for (u32 i = 1; i < numVerts; ++i)
{
*Lptr++ = index + i - 1;
*Lptr++ = index + i;
++numL;
}
}
// Points
void IndexGenerator::AddPoints(u32 numVerts)
{
for (u32 i = 0; i != numVerts; ++i)
{
*Pptr++ = index + i;
++numP;
}
}
u32 IndexGenerator::GetRemainingIndices()
{
u32 max_index = 65535;
return max_index - index;
}
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