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FIFO: Fix buffer copying for AltiVec.

This commit is contained in:
rogerman 2021-09-04 17:42:56 -07:00
parent 192e0f88b2
commit ef35f72172
1 changed files with 18 additions and 1 deletions
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19
desmume/src/FIFO.cpp Normal file → Executable file
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@ -402,7 +402,20 @@ void DISP_FIFOrecv_Line16(u16 *__restrict dst)
template <NDSColorFormat OUTPUTFORMAT>
void _DISP_FIFOrecv_LineOpaque16_vec(u32 *__restrict dst)
{
#if defined(ENABLE_ALTIVEC)
// Big-endian systems read the pixels in their correct bit order, but swap 16-bit chunks
// within 32-bit lanes, and so we can't use a standard buffer copy function here.
for (size_t i = 0; i < GPU_FRAMEBUFFER_NATIVE_WIDTH * sizeof(u16); i+=sizeof(v128u16))
{
v128u16 fifoColor = vec_ld(i, disp_fifo.buf + disp_fifo.head);
fifoColor = vec_perm( fifoColor, fifoColor, ((v128u8){2,3, 0,1, 6,7, 4,5, 10,11, 8,9, 14,15, 12,13}) );
fifoColor = vec_or(fifoColor, ((v128u16){0x8000,0x8000,0x8000,0x8000,0x8000,0x8000,0x8000,0x8000}));
vec_st(fifoColor, i, dst);
}
#else
buffer_copy_or_constant_s16_fast<GPU_FRAMEBUFFER_NATIVE_WIDTH * sizeof(u16), false>(dst, disp_fifo.buf + disp_fifo.head, 0x8000);
#endif
_DISP_FIFOrecv_LineAdvance();
}
@ -490,7 +503,7 @@ void _DISP_FIFOrecv_LineOpaque32_vec(u32 *__restrict dst)
#elif defined(ENABLE_ALTIVEC)
for (size_t i = 0, d = 0; i < GPU_FRAMEBUFFER_NATIVE_WIDTH * sizeof(u16); i+=16, d+=32)
{
const v128u16 fifoColor = vec_ld(disp_fifo.head, disp_fifo.buf);
v128u16 fifoColor = vec_ld(0, disp_fifo.buf + disp_fifo.head);
disp_fifo.head += (sizeof(v128u16)/sizeof(u32));
if (disp_fifo.head >= 0x6000)
@ -500,6 +513,7 @@ void _DISP_FIFOrecv_LineOpaque32_vec(u32 *__restrict dst)
v128u32 dstLo = ((v128u32){0,0,0,0});
v128u32 dstHi = ((v128u32){0,0,0,0});
fifoColor = vec_perm( fifoColor, fifoColor, ((v128u8){10,11, 8,9, 14,15, 12,13, 2,3, 0,1, 6,7, 4,5}) );
if (OUTPUTFORMAT == NDSColorFormat_BGR666_Rev)
{
@ -510,6 +524,9 @@ void _DISP_FIFOrecv_LineOpaque32_vec(u32 *__restrict dst)
ColorspaceConvert555To8888Opaque_AltiVec<false>(fifoColor, dstLo, dstHi);
}
dstLo = vec_perm( dstLo, dstLo, ((v128u8){3,2,1,0, 7,6,5,4, 11,10,9,8, 15,14,13,12}) );
dstHi = vec_perm( dstHi, dstHi, ((v128u8){3,2,1,0, 7,6,5,4, 11,10,9,8, 15,14,13,12}) );
vec_st(dstLo, d + 0, dst);
vec_st(dstHi, d + 16, dst);
}