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Add support for 32 bit indices for the terrain chunk geometry

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This commit is contained in:
Wojtek Figat
2023-02-14 13:14:04 +01:00
parent 7d6472a160
commit 752fa64cc3
3 changed files with 45 additions and 24 deletions
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57
Source/Engine/Terrain/TerrainManager.cpp
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@@ -98,10 +98,12 @@ bool TerrainManager::GetChunkGeometry(DrawCall& drawCall, int32 chunkSize, int32
// Prepare
const int32 vertexCount = (chunkSize + 1) >> lodIndex;
chunkSize = vertexCount - 1;
const bool indexUse16bits = chunkSize * chunkSize * vertexCount < MAX_uint16;
const int32 indexSize = indexUse16bits ? sizeof(uint16) : sizeof(uint32);
const int32 indexCount = chunkSize * chunkSize * 2 * 3;
const int32 vertexCount2 = vertexCount * vertexCount;
const int32 vbSize = sizeof(TerrainVertex) * vertexCount2;
const int32 ibSize = sizeof(uint16) * indexCount;
const int32 ibSize = indexSize * indexCount;
TempData.Clear();
TempData.EnsureCapacity(Math::Max(vbSize, ibSize));
@@ -140,26 +142,51 @@ bool TerrainManager::GetChunkGeometry(DrawCall& drawCall, int32 chunkSize, int32
// Create index buffer
auto ib = GPUDevice::Instance->CreateBuffer(TEXT("TerrainChunk.IB"));
auto index = (uint16*)TempData.Get();
for (int32 z = 0; z < chunkSize; z++)
if (indexUse16bits)
{
for (int32 x = 0; x < chunkSize; x++)
auto index = (uint16*)TempData.Get();
for (int32 z = 0; z < chunkSize; z++)
{
const uint16 i00 = (x + 0) + (z + 0) * vertexCount;
const uint16 i10 = (x + 1) + (z + 0) * vertexCount;
const uint16 i11 = (x + 1) + (z + 1) * vertexCount;
const uint16 i01 = (x + 0) + (z + 1) * vertexCount;
for (int32 x = 0; x < chunkSize; x++)
{
const uint16 i00 = (x + 0) + (z + 0) * vertexCount;
const uint16 i10 = (x + 1) + (z + 0) * vertexCount;
const uint16 i11 = (x + 1) + (z + 1) * vertexCount;
const uint16 i01 = (x + 0) + (z + 1) * vertexCount;
*index++ = i00;
*index++ = i11;
*index++ = i10;
*index++ = i00;
*index++ = i11;
*index++ = i10;
*index++ = i00;
*index++ = i01;
*index++ = i11;
*index++ = i00;
*index++ = i01;
*index++ = i11;
}
}
}
desc = GPUBufferDescription::Index(sizeof(uint16), indexCount, TempData.Get());
else
{
auto index = (uint32*)TempData.Get();
for (int32 z = 0; z < chunkSize; z++)
{
for (int32 x = 0; x < chunkSize; x++)
{
const uint32 i00 = (x + 0) + (z + 0) * vertexCount;
const uint32 i10 = (x + 1) + (z + 0) * vertexCount;
const uint32 i11 = (x + 1) + (z + 1) * vertexCount;
const uint32 i01 = (x + 0) + (z + 1) * vertexCount;
*index++ = i00;
*index++ = i11;
*index++ = i10;
*index++ = i00;
*index++ = i01;
*index++ = i11;
}
}
}
desc = GPUBufferDescription::Index(indexSize, indexCount, TempData.Get());
if (ib->Init(desc))
{
vb->ReleaseGPU();