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Metal: convert triangle fan to triangle list

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This commit is contained in:
Fabio Arnold 2026-03-16 22:09:24 +01:00
parent 2913a8ca7a
commit 2ec9c00dc6
2 changed files with 44 additions and 25 deletions
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67
src/Cafe/HW/Latte/Core/LatteIndices.cpp
View File

@ -117,16 +117,22 @@ uint32 LatteIndices_calculateIndexOutputSize(LattePrimitiveMode primitiveMode, L
}
else if (primitiveMode == LattePrimitiveMode::TRIANGLE_FAN && g_renderer->GetType() == RendererAPI::Metal)
{
// Metal doesn't support triangle fan -> convert to triangle list
if (count <= 2)
{
return 0;
}
uint32 numTriangles = count - 2;
if (indexType == LatteIndexType::AUTO)
{
if (count <= 0xFFFF)
return count * sizeof(uint16);
return count * sizeof(uint32);
return numTriangles * 3 * sizeof(uint16);
return numTriangles * 3 * sizeof(uint32);
}
if (indexType == LatteIndexType::U16_BE || indexType == LatteIndexType::U16_LE)
return count * sizeof(uint16);
return numTriangles * 3 * sizeof(uint16);
if (indexType == LatteIndexType::U32_BE || indexType == LatteIndexType::U32_LE)
return count * sizeof(uint32);
return numTriangles * 3 * sizeof(uint32);
cemu_assert_suspicious();
return 0;
}
@ -326,36 +332,46 @@ void LatteIndices_generateAutoLineLoopIndices(void* indexDataOutput, uint32 coun
template<typename T>
void LatteIndices_unpackTriangleFanAndConvert(const void* indexDataInput, void* indexDataOutput, uint32 count, uint32& indexMin, uint32& indexMax)
{
if (count <= 2)
return;
sint32 numTriangles = count - 2;
const betype<T>* src = (betype<T>*)indexDataInput;
T idx0 = src[0];
indexMin = std::min(indexMin, (uint32)idx0);
indexMax = std::max(indexMax, (uint32)idx0);
T* dst = (T*)indexDataOutput;
// TODO: check this
for (sint32 i = 0; i < count; i++)
for (sint32 i = 0; i < numTriangles; i++)
{
uint32 i0;
if (i % 2 == 0)
i0 = i / 2;
else
i0 = count - 1 - i / 2;
T idx = src[i0];
indexMin = std::min(indexMin, (uint32)idx);
indexMax = std::max(indexMax, (uint32)idx);
dst[i] = idx;
T idx1 = src[1];
T idx2 = src[2];
indexMin = std::min(indexMin, (uint32)idx1);
indexMax = std::max(indexMax, (uint32)idx1);
indexMin = std::min(indexMin, (uint32)idx2);
indexMax = std::max(indexMax, (uint32)idx2);
dst[0] = idx0;
dst[1] = idx1;
dst[2] = idx2;
src += 1;
dst += 3;
}
}
template<typename T>
void LatteIndices_generateAutoTriangleFanIndices(const void* indexDataInput, void* indexDataOutput, uint32 count, uint32& indexMin, uint32& indexMax)
{
const betype<T>* src = (betype<T>*)indexDataInput;
if (count <= 2)
return;
sint32 numTriangles = count - 2;
T* dst = (T*)indexDataOutput;
for (sint32 i = 0; i < count; i++)
for (sint32 i = 0; i < numTriangles; i++)
{
T idx = i;
if (idx % 2 == 0)
idx = idx / 2;
else
idx = count - 1 - idx / 2;
dst[i] = idx;
T idx0 = 0;
T idx1 = i + 1;
T idx2 = i + 2;
dst[0] = idx0;
dst[1] = idx1;
dst[2] = idx2;
dst += 3;
}
indexMin = 0;
indexMax = std::max(count, 1u) - 1;
@ -868,7 +884,10 @@ void LatteIndices_decode(const void* indexData, LatteIndexType indexType, uint32
LatteIndices_unpackTriangleFanAndConvert<uint32>(indexData, indexOutputPtr, count, indexMin, indexMax);
else
cemu_assert_debug(false);
outputCount = count;
if (count >= 2)
outputCount = (count - 2) * 3;
else
outputCount = 0;
}
else
{

2
src/Cafe/HW/Latte/Renderer/Metal/LatteToMtl.cpp
View File

@ -244,7 +244,7 @@ MTL::PrimitiveType GetMtlPrimitiveType(LattePrimitiveMode primitiveMode)
case Latte::LATTE_VGT_PRIMITIVE_TYPE::E_PRIMITIVE_TYPE::TRIANGLES:
return MTL::PrimitiveTypeTriangle;
case Latte::LATTE_VGT_PRIMITIVE_TYPE::E_PRIMITIVE_TYPE::TRIANGLE_FAN:
return MTL::PrimitiveTypeTriangleStrip;
return MTL::PrimitiveTypeTriangle; // triangle fans are emulated as a triangle list
case Latte::LATTE_VGT_PRIMITIVE_TYPE::E_PRIMITIVE_TYPE::TRIANGLE_STRIP:
return MTL::PrimitiveTypeTriangleStrip;
case Latte::LATTE_VGT_PRIMITIVE_TYPE::E_PRIMITIVE_TYPE::QUADS: