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Complete ReadSourcePixel & ReadSourceByte paths.

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This commit is contained in:
Thomas Harte 2023-02-04 21:23:41 -05:00
parent a2786e6266
commit c6372295c5
2 changed files with 29 additions and 11 deletions
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37
Components/9918/Implementation/9918Base.hpp
View File

@ -674,8 +674,26 @@ template <Personality personality> struct Base: public Storage<personality> {
}
}
uint8_t extract_colour(uint8_t byte, Vector location) const {
switch(this->screen_mode_) {
default:
case ScreenMode::YamahaGraphics4: // 256 pixels @ 4bpp
case ScreenMode::YamahaGraphics6: // 512 pixels @ 4bpp
return (byte >> (((location.v[0] & 1) ^ 1) << 2)) & 0xf;
case ScreenMode::YamahaGraphics5: // 512 pixels @ 2bpp
return (byte >> (((location.v[0] & 3) ^ 3) << 1)) & 0x3;
case ScreenMode::YamahaGraphics7: // 256 pixels @ 8bpp
return byte;
}
}
std::pair<uint8_t, uint8_t> command_colour_mask(Vector location) const {
if constexpr (is_yamaha_vdp(personality)) {
auto &context = Storage<personality>::command_context_;
auto colour = context.latched_colour.has_value() ? context.latched_colour : context.colour;
switch(this->screen_mode_) {
default:
case ScreenMode::YamahaGraphics4: // 256 pixels @ 4bpp
@ -683,21 +701,21 @@ template <Personality personality> struct Base: public Storage<personality> {
return
std::make_pair(
0xf0 >> ((location.v[0] & 1) << 2),
Storage<personality>::command_context_.colour.colour4bpp
colour.colour4bpp
);
case ScreenMode::YamahaGraphics5: // 512 pixels @ 2bpp
return
std::make_pair(
0xc0 >> ((location.v[0] & 3) << 1),
Storage<personality>::command_context_.colour.colour2bpp
colour.colour2bpp
);
case ScreenMode::YamahaGraphics7: // 256 pixels @ 8bpp
return
std::make_pair(
0xff,
Storage<personality>::command_context_.colour.colour
colour.colour
);
}
} else {
@ -726,10 +744,7 @@ template <Personality personality> struct Base: public Storage<personality> {
break;
case CommandStep::ReadSourcePixel:
// TODO: the read as below, but to an appropriate piece of temporary colour
// storage; per the manual the colour register is unchanged, so I can't just
// put it there.
// Storage<personality>::command_latch_ = ram_[command_address(context.source)];
context.latched_colour.set(extract_colour(ram_[command_address(context.source)], context.source));
Storage<personality>::minimum_command_column_ = access_column + 32;
Storage<personality>::next_command_step_ = CommandStep::ReadDestinationPixel;
@ -746,6 +761,7 @@ template <Personality personality> struct Base: public Storage<personality> {
const auto [mask, unmasked_colour] = command_colour_mask(context.destination);
const auto address = command_address(context.destination);
const uint8_t colour = unmasked_colour & mask;
context.latched_colour.reset();
using LogicalOperation = CommandContext::LogicalOperation;
if(!context.test_source || colour) {
@ -778,15 +794,16 @@ template <Personality personality> struct Base: public Storage<personality> {
} break;
case CommandStep::ReadSourceByte:
// TODO: the read as below, and store somewhere for future write.
// Storage<personality>::command_latch_ = ram_[command_address(context.source)];
context.latched_colour.set(ram_[command_address(context.source)]);
Storage<personality>::minimum_command_column_ = access_column + 24;
Storage<personality>::next_command_step_ = CommandStep::WriteByte;
break;
case CommandStep::WriteByte:
ram_[command_address(context.destination)] = context.colour.colour;
ram_[command_address(context.destination)] = context.latched_colour.has_value() ? context.latched_colour.colour : context.colour.colour;
context.latched_colour.reset();
Storage<personality>::command_->advance(pixels_per_byte(this->underlying_mode_));
Storage<personality>::update_command_step(access_column);
break;

3
Components/9918/Implementation/YamahaCommands.hpp
View File

@ -54,7 +54,7 @@ struct Colour {
colour4bpp = 0xff;
}
bool has_value() {
bool has_value() const {
return (colour & 0x3) == (colour4bpp & 0x3);
}
@ -73,6 +73,7 @@ struct CommandContext {
uint8_t arguments = 0;
Colour colour;
Colour latched_colour;
enum class LogicalOperation {
Copy = 0b0000,