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/*
Copyright 2022 Gabriel Jensen.
This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
#include <agbx/priv.h>
#include <agbx/gfx.h>
void agbx_setpx1(agbx_i20 const _vaddr,agbx_i10 const _px,agbx_i8 const _col) {
#if defined(__agbx_dbg)
agbx_i10 const dispcnt = agbx_get10(0x400'0000u);
agbx_i8 const md = dispcnt & 0x7u;
if (md != 0x4u) {agbx_done(agbx_err_badmd);}
if (_px >= 0x9600u) {agbx_done(agbx_err_px2big);}
#endif
/* We can only write halfwords to VRAM, so we load the adjacent pixel value and combine it into a halfword. */
agbx_i20 const addr = _vaddr + _px - (_px & 0x1u) * 0x1u;
agbx_i10 col;
if (_px & 0x1u) {col = (agbx_i10)agbx_get8(addr) | (agbx_i10)_col << 0x8u;}
else {col = (agbx_i10)agbx_get8(addr + 0x1u) << 0x8u | (agbx_i10)_col;}
__agbx_set10(addr,col);
}
void agbx_setpx2(agbx_i20 const _vaddr,agbx_i10 const _px,agbx_i10 const _col) {
#if defined(__agbx_dbg)
agbx_i10 const dispcnt = agbx_get10(0x400'0000u);
agbx_i8 const md = dispcnt & 0x7u;
if (md == 0x4u) {agbx_done(agbx_err_badmd);}
if (md == 0x5u) {
if (_px >= 0x5000u) {agbx_done(agbx_err_px2big);}
}
else {
if (md != 0x3u) {agbx_done(agbx_err_badmd);}
if (_px >= 0x9600u) {agbx_done(agbx_err_px2big);}
}
#endif
__agbx_setpx2(_vaddr,_px,_col)
}
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