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Convert restart indices to degenerate triangles for Mesa.

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Skyth 2025-02-18 19:51:12 +03:00
parent 4aeee49561
commit c0117cb43a
1 changed files with 181 additions and 0 deletions
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181
UnleashedRecomp/gpu/video.cpp
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@ -7402,6 +7402,187 @@ bool FxShadowMapMidAsmHook(PPCRegister& r4, PPCRegister& r5, PPCRegister& r6, PP
}
}
// There is a driver bug on Mesa where restart indices cause incorrect culling and prevent some triangles from being rendered.
// Restart indices can be converted to degenerate triangles as a workaround until this issue gets fixed.
static void ConvertToDegenerateTriangles(uint16_t* indices, uint32_t indexCount, uint16_t*& newIndices, uint32_t& newIndexCount)
{
newIndices = reinterpret_cast<uint16_t*>(g_userHeap.Alloc(indexCount * sizeof(uint16_t) * 3));
newIndexCount = 0;
bool stripStart = true;
uint32_t stripSize = 0;
uint16_t lastIndex = 0;
for (uint32_t i = 0; i < indexCount; i++)
{
uint16_t index = indices[i];
if (index == 0xFFFF)
{
if ((stripSize % 2) != 0)
newIndices[newIndexCount++] = lastIndex;
stripStart = true;
stripSize = 0;
}
else
{
if (stripStart && newIndexCount != 0)
{
newIndices[newIndexCount++] = lastIndex;
newIndices[newIndexCount++] = index;
}
newIndices[newIndexCount++] = index;
stripStart = false;
++stripSize;
lastIndex = index;
}
}
}
struct MeshResource
{
SWA_INSERT_PADDING(0x4);
be<uint32_t> indexCount;
be<uint32_t> indices;
};
static std::vector<uint16_t*> g_newIndicesToFree;
// Hedgehog::Mirage::CMeshData::Make
PPC_FUNC_IMPL(__imp__sub_82E44AF8);
PPC_FUNC(sub_82E44AF8)
{
uint16_t* newIndicesToFree = nullptr;
auto databaseData = reinterpret_cast<Hedgehog::Database::CDatabaseData*>(base + ctx.r3.u32);
if (!databaseData->IsMadeOne())
{
auto meshResource = reinterpret_cast<MeshResource*>(base + ctx.r4.u32);
if (meshResource->indexCount != 0)
{
uint16_t* newIndices;
uint32_t newIndexCount;
ConvertToDegenerateTriangles(
reinterpret_cast<uint16_t*>(base + meshResource->indices),
meshResource->indexCount,
newIndices,
newIndexCount);
meshResource->indexCount = newIndexCount;
meshResource->indices = static_cast<uint32_t>(reinterpret_cast<uint8_t*>(newIndices) - base);
if (PPC_LOAD_U32(0x83396E98) != NULL)
{
// If index buffers are getting merged, new indices need to survive until the merge happens.
g_newIndicesToFree.push_back(newIndices);
}
else
{
// Otherwise, we can free it immediately.
newIndicesToFree = newIndices;
}
}
}
__imp__sub_82E44AF8(ctx, base);
if (newIndicesToFree != nullptr)
g_userHeap.Free(newIndicesToFree);
}
// Hedgehog::Mirage::CShareVertexBuffer::Reset
PPC_FUNC_IMPL(__imp__sub_82E250D0);
PPC_FUNC(sub_82E250D0)
{
__imp__sub_82E250D0(ctx, base);
for (auto newIndicesToFree : g_newIndicesToFree)
g_userHeap.Free(newIndicesToFree);
g_newIndicesToFree.clear();
}
struct LightAndIndexBufferResourceV1
{
SWA_INSERT_PADDING(0x4);
be<uint32_t> indexCount;
be<uint32_t> indices;
};
// Hedgehog::Mirage::CLightAndIndexBufferData::MakeV1
PPC_FUNC_IMPL(__imp__sub_82E3AFC8);
PPC_FUNC(sub_82E3AFC8)
{
uint16_t* newIndices = nullptr;
auto databaseData = reinterpret_cast<Hedgehog::Database::CDatabaseData*>(base + ctx.r3.u32);
if (!databaseData->IsMadeOne())
{
auto lightAndIndexBufferResource = reinterpret_cast<LightAndIndexBufferResourceV1*>(base + ctx.r4.u32);
if (lightAndIndexBufferResource->indexCount != 0)
{
uint32_t newIndexCount;
ConvertToDegenerateTriangles(
reinterpret_cast<uint16_t*>(base + lightAndIndexBufferResource->indices),
lightAndIndexBufferResource->indexCount,
newIndices,
newIndexCount);
lightAndIndexBufferResource->indexCount = newIndexCount;
lightAndIndexBufferResource->indices = static_cast<uint32_t>(reinterpret_cast<uint8_t*>(newIndices) - base);
}
}
__imp__sub_82E3AFC8(ctx, base);
if (newIndices != nullptr)
g_userHeap.Free(newIndices);
}
struct LightAndIndexBufferResourceV5
{
SWA_INSERT_PADDING(0x8);
be<uint32_t> indexCount;
be<uint32_t> indices;
};
// Hedgehog::Mirage::CLightAndIndexBufferData::MakeV5
PPC_FUNC_IMPL(__imp__sub_82E3B1C0);
PPC_FUNC(sub_82E3B1C0)
{
uint16_t* newIndices = nullptr;
auto databaseData = reinterpret_cast<Hedgehog::Database::CDatabaseData*>(base + ctx.r3.u32);
if (!databaseData->IsMadeOne())
{
auto lightAndIndexBufferResource = reinterpret_cast<LightAndIndexBufferResourceV5*>(base + ctx.r4.u32);
if (lightAndIndexBufferResource->indexCount != 0)
{
uint32_t newIndexCount;
ConvertToDegenerateTriangles(
reinterpret_cast<uint16_t*>(base + lightAndIndexBufferResource->indices),
lightAndIndexBufferResource->indexCount,
newIndices,
newIndexCount);
lightAndIndexBufferResource->indexCount = newIndexCount;
lightAndIndexBufferResource->indices = static_cast<uint32_t>(reinterpret_cast<uint8_t*>(newIndices) - base);
}
}
__imp__sub_82E3B1C0(ctx, base);
if (newIndices != nullptr)
g_userHeap.Free(newIndices);
}
GUEST_FUNCTION_HOOK(sub_82BD99B0, CreateDevice);
GUEST_FUNCTION_HOOK(sub_82BE6230, DestructResource);