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fix(gx): correct mip pointer handling in MippedImgAllocA

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fallenoak 2025-12-13 11:51:17 -06:00
parent e47edce5a3
commit 0063f7fd12
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1 changed files with 18 additions and 7 deletions
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25
src/gx/Texture.cpp
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@ -11,6 +11,11 @@
#include <storm/Memory.hpp>
#include <storm/String.hpp>
#define ALIGN_PTR(ptr, align) \
((void*)(((uintptr_t)(ptr) + ((uintptr_t)(align) - 1)) & ~((uintptr_t)(align) - 1)))
#define MIPPED_IMG_ALIGN 16
namespace Texture {
int32_t s_createBlpAsync; // Invented name
MipBits* s_mipBits;
@ -505,19 +510,25 @@ MipBits* MippedImgAllocA(uint32_t fourCC, uint32_t width, uint32_t height, const
uint32_t levelCount = CalcLevelCount(width, height);
uint32_t levelDataSize = CalcLevelOffset(levelCount, width, height, fourCC);
MipBits* images = reinterpret_cast<MipBits*>(SMemAlloc(levelDataSize + sizeof(void*) * levelCount + 16, fileName, lineNumber, 0));
// Size must account for pointer array (MipBits::mip[]) + mip data + alignment
size_t imageSize = (sizeof(MipBits::mip) * levelCount) + levelDataSize + MIPPED_IMG_ALIGN;
auto imageData = static_cast<char*>(SMemAlloc(imageSize, fileName, lineNumber, 0x0));
uintptr_t v10 = (reinterpret_cast<uintptr_t>(images) + sizeof(void*) * levelCount + 15) & static_cast<uintptr_t>(-sizeof(void*));
uintptr_t offset = v10 - reinterpret_cast<uintptr_t>(images);
// Image (MipBits) is a dynamically sized array of mip pointers (MipBits::mip[])
auto image = reinterpret_cast<MipBits*>(imageData);
MipBits** ptr = reinterpret_cast<MipBits**>(images);
// Mip data starts after mip pointers
auto mipBase = imageData + (sizeof(MipBits::mip) * levelCount);
auto alignedMipBase = static_cast<char*>(ALIGN_PTR(mipBase, MIPPED_IMG_ALIGN));
// Populate mip pointers for each mip level
uint32_t levelOffset = 0;
for (int32_t level = 0; level < levelCount; level++) {
ptr[level] = images + offset;
offset += CalcLevelSize(level, width, height, fourCC);
image->mip[level] = reinterpret_cast<C4Pixel*>(alignedMipBase + levelOffset);
levelOffset += CalcLevelSize(level, width, height, fourCC);
}
return images;
return image;
}
uint32_t MippedImgCalcSize(uint32_t fourCC, uint32_t width, uint32_t height) {