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melonDS
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horizontal scrolling for 3D layer

This commit is contained in:
StapleButter 2017-03-07 01:36:16 +01:00
parent d95d22837b
commit 7799b33dfe
1 changed files with 21 additions and 3 deletions
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24
GPU2D.cpp
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@ -871,12 +871,30 @@ void GPU2D::DrawPixel(u32* dst, u16 color, u32 flag)
void GPU2D::DrawBG_3D(u32 line, u32* dst) void GPU2D::DrawBG_3D(u32 line, u32* dst)
{ {
// TODO: scroll, etc // TODO: window, as for everything
// also check if window can prevent blending from happening
u32* src = GPU3D::GetLine(line); u32* src = GPU3D::GetLine(line);
for (int i = 0; i < 256; i++)
u16 xoff = BGXPos[0];
int i = 0;
int iend = 256;
if (xoff & 0x100)
{ {
u32 c = src[i]; i = (0x100 - (xoff & 0xFF));
xoff += i;
}
if ((xoff + iend - 1) & 0x100)
{
iend -= (xoff & 0xFF);
}
for (; i < iend; i++)
{
u32 c = src[xoff];
xoff++;
if ((c >> 24) == 0) continue; if ((c >> 24) == 0) continue;
dst[i+256] = dst[i]; dst[i+256] = dst[i];