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Edge towards not assuming graphics mode. Much more to do here.

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This commit is contained in:
Thomas Harte 2023-01-28 13:54:26 -05:00
parent c6cda7c401
commit 975ead5d01
1 changed files with 30 additions and 5 deletions
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31
Components/9918/Implementation/9918Base.hpp
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@ -584,10 +584,36 @@ template <Personality personality> struct Base: public Storage<personality> {
return;
}
// TODO: undo assumption of Graphics Mode 5, pervasively but starting here.
const unsigned int address =
// Compute the affected address and pixel
unsigned address;
uint8_t mask;
switch(this->screen_mode_) {
default:
case ScreenMode::YamahaGraphics4: // 256 pixels @ 4bpp
address =
(Storage<personality>::command_->location.v[0] >> 1) +
(Storage<personality>::command_->location.v[1] << 7);
mask = 0xf0 >> ((Storage<personality>::command_->location.v[0] & 1) << 2);
break;
case ScreenMode::YamahaGraphics5: // 512 pixels @ 2bpp
address =
(Storage<personality>::command_->location.v[0] >> 2) +
(Storage<personality>::command_->location.v[1] << 7);
mask = 0xc0 >> ((Storage<personality>::command_->location.v[0] & 3) << 1);
break;
case ScreenMode::YamahaGraphics6: // 512 pixels @ 4bpp
address =
(Storage<personality>::command_->location.v[0] >> 1) +
(Storage<personality>::command_->location.v[1] << 8);
mask = 0xf0 >> ((Storage<personality>::command_->location.v[0] & 1) << 2);
break;
case ScreenMode::YamahaGraphics7: // 256 pixels @ 8bpp
address =
(Storage<personality>::command_->location.v[0] >> 0) +
(Storage<personality>::command_->location.v[1] << 8);
mask = 0xff;
break;
}
switch(Storage<personality>::next_command_step_) {
// Duplicative, but keeps the compiler happy.
@ -606,7 +632,6 @@ template <Personality personality> struct Base: public Storage<personality> {
packed_colour |= packed_colour << 2;
packed_colour |= packed_colour << 4;
const uint8_t mask = 0xc0 >> ((Storage<personality>::command_->location.v[0] & 3) << 1);
Storage<personality>::command_latch_ &= ~mask;
Storage<personality>::command_latch_ |= packed_colour & mask;
ram_[address] = Storage<personality>::command_latch_;