diff options
Diffstat (limited to 'agbx/source/gfx/plot.c')
| -rw-r--r-- | agbx/source/gfx/plot.c | 29 |
1 files changed, 18 insertions, 11 deletions
diff --git a/agbx/source/gfx/plot.c b/agbx/source/gfx/plot.c index a100208..066b97e 100644 --- a/agbx/source/gfx/plot.c +++ b/agbx/source/gfx/plot.c @@ -8,17 +8,24 @@ #include <ax/gfx.h> -void ax_plot3(ax_i8 const _x,ax_i8 const _y,ax_i01 const _col) { - ax_i01 const px = _y * 0xF0u + _x; - __ax_setpx2(0x600'0000u,px,_col) +void ax_plot1(ax_i02 const _vaddr,ax_i01 const _px,ax_i8 const _col) { + /* We can only write halfwords to VRAM, so we need to load the adjacent pixel value and combine it into a halfword. */ + bool const odd = _px & 0x1u; + ax_i02 addr = _vaddr + _px - odd; + ax_i01 precol = __ax_get10(addr); + ax_i01 col = _col; + if (odd) { + precol &= 0b11111111u; + col <<= 0x8u; + } + else { + precol &= 0b1111111100000000u; + } + ax_i01 const newcol = precol | col; + __ax_set10(addr,newcol); } -void ax_plot4(ax_i02 const _vaddr,ax_i8 const _x,ax_i8 const _y,ax_i8 const _col) { - ax_i01 const px = _y * 0xF0u + _x; - ax_setpx1(_vaddr,px,_col); -} - -void ax_plot5(ax_i02 const _vaddr,ax_i8 const _x,ax_i8 const _y,ax_i01 const _col) { - ax_i01 const px = _y * 0xA0u + _x; - __ax_setpx2(_vaddr,px,_col) +void ax_plot2(ax_i02 const _vaddr,ax_i01 const _px,ax_i01 const _col) { + ax_i02 const addr = _vaddr + _px; + __ax_set10(addr,_col); } |