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gfxWriteFramebufferInfo: use correct atomic update code

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fincs 2020-05-04 21:17:21 +02:00
parent 98664af53c
commit 92ddd9e9b3
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GPG Key ID: 62C7609ADA219C60
1 changed files with 8 additions and 7 deletions
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15
libctru/source/gfx.c
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@ -131,22 +131,23 @@ static void gfxWriteFramebufferInfo(gfxScreen_t screen)
s32* framebufferInfoHeader=(s32*)(gfxSharedMemory+0x200+gfxThreadID*0x80);
if(screen==GFX_BOTTOM)framebufferInfoHeader+=0x10;
GSPGPU_FramebufferInfo* framebufferInfo=(GSPGPU_FramebufferInfo*)&framebufferInfoHeader[1];
u8 pos = 1 - *(u8*)framebufferInfoHeader;
framebufferInfo[pos]=*framebufferInfoSt[screen];
__dsb();
union
{
s32 header;
struct { u8 swap, update; };
} info;
info.header = __ldrex(framebufferInfoHeader);
info.swap = !info.swap;
u8 pos = info.swap;
info.update = 1;
framebufferInfo[pos]=*framebufferInfoSt[screen];
while (__strex(framebufferInfoHeader,info.header))
do
{
info.header = __ldrex(framebufferInfoHeader);
info.swap = pos;
info.update = 1;
}
} while (__strex(framebufferInfoHeader, info.header));
}
void gfxInit(GSPGPU_FramebufferFormats topFormat, GSPGPU_FramebufferFormats bottomFormat, bool vrambuffers)