Method ReadImageX

pcsx2/GS/GSLocalMemoryMultiISA.cpp:904–1047

//

void GSLocalMemoryFunctions::ReadImageX(const GSLocalMemory& mem, int& tx, int& ty, u8* dst, int len, GIFRegBITBLTBUF& BITBLTBUF, GIFRegTRXPOS& TRXPOS, GIFRegTRXREG& TRXREG)
{
	if (len <= 0)
		return;

	u8* RESTRICT pb = (u8*)dst;
	u16* RESTRICT pw = (u16*)dst;
	u32* RESTRICT pd = (u32*)dst;
	const u32* vm32 = mem.vm32();
	const u16* vm16 = mem.vm16();
	const u8* vm8 = mem.vm8();

	u32 bp = BITBLTBUF.SBP;
	u32 bw = BITBLTBUF.SBW;

	int sx = TRXPOS.SSAX;
	int w = TRXREG.RRW;

	GSOffset off = mem.GetOffset(bp, bw, BITBLTBUF.SPSM);

	// printf("spsm=%d x=%d ex=%d y=%d len=%d\n", BITBLTBUF.SPSM, x, ex, y, len);

	switch (BITBLTBUF.SPSM)
	{
		case PSMCT32:
		case PSMZ32:
		{
			// MGS1 intro, fade effect between two scenes (airplane outside-inside transition)

			int x = tx;
			int y = ty;
			int ex = sx + w;

			len /= 4;

			u32* vm = mem.vm32();
			GSOffset::PAHelper pa = off.assertSizesMatch(GSLocalMemory::swizzle32).paMulti(0, y);

			while (len > 0)
			{
				for (; len > 0 && x < ex && (x & 7); len--, x++, pd++)
				{
					*pd = vm[pa.value(x)];
				}

				// aligned to a column

				for (int ex8 = ex - 8; len >= 8 && x <= ex8; len -= 8, x += 8, pd += 8)
				{
					u32* ps = &vm[pa.value(x)];

					GSVector4i::store<false>(&pd[0], GSVector4i::load(ps + 0, ps + 4));
					GSVector4i::store<false>(&pd[4], GSVector4i::load(ps + 8, ps + 12));

					for (int i = 0; i < 8; i++)
						pxAssert(pd[i] == vm[pa.value(x + i)]);
				}