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Make faulty attempt at 80-column text.

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This commit is contained in:
Thomas Harte 2023-02-14 20:13:51 -05:00
parent 1edf747f9f
commit bf0ed2813c
3 changed files with 38 additions and 4 deletions
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8
Components/9918/Implementation/9918.cpp
View File

@ -330,10 +330,18 @@ void TMS9918<personality>::run_for(const HalfCycles cycles) {
next_line_buffer.next_border_column = Timing<personality>::LastTextCycle;
next_line_buffer.pixel_count = 240;
break;
case ScreenMode::YamahaText80:
next_line_buffer.fetch_mode = FetchMode::Yamaha;
next_line_buffer.first_pixel_output_column = Timing<personality>::FirstTextCycle;
next_line_buffer.next_border_column = Timing<personality>::LastTextCycle;
next_line_buffer.pixel_count = 480;
break;
case ScreenMode::SMSMode4:
next_line_buffer.fetch_mode = FetchMode::SMS;
this->mode_timing_.maximum_visible_sprites = 8;
break;
case ScreenMode::YamahaGraphics3:
case ScreenMode::YamahaGraphics4:
case ScreenMode::YamahaGraphics7:

27
Components/9918/Implementation/Draw.hpp
View File

@ -314,6 +314,32 @@ void Base<personality>::draw_yamaha(LineBuffer &buffer, int start, int end) {
return;
}
if constexpr (mode == ScreenMode::YamahaText80) {
const uint32_t primary_colours[2] = { palette()[background_colour_], palette()[text_colour_] };
// const uint32_t inverse_colours[2] = { palette()[background_colour_], palette()[text_colour_] }; // TODO.
start >>= 1;
end >>= 1;
const int shift = start % 6;
int byte_column = start / 6;
int pattern = Numeric::bit_reverse(buffer.patterns[byte_column >> 1][byte_column & 1]) >> shift;
int pixels_left = end - start;
int length = std::min(pixels_left, 6 - shift);
while(true) {
pixels_left -= length;
for(int c = 0; c < length; ++c) {
pixel_target_[c] = primary_colours[pattern&0x01]; // TODO.
pattern >>= 1;
}
pixel_target_ += length;
if(!pixels_left) break;
length = std::min(6, pixels_left);
byte_column++;
pattern = Numeric::bit_reverse(buffer.patterns[byte_column >> 1][byte_column & 1]);
}
}
}
template <Personality personality>
@ -326,6 +352,7 @@ void Base<personality>::draw_yamaha(int start, int end) {
// These modes look the same as on the TMS.
case ScreenMode::Text: draw_tms_text(start >> 2, end >> 2); break;
Dispatch(YamahaText80);
Dispatch(YamahaGraphics3);
Dispatch(YamahaGraphics4);
Dispatch(YamahaGraphics5);

7
Components/9918/Implementation/Fetch.hpp
View File

@ -493,7 +493,6 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
name_[1] = ram_[start + column + 1];
name_[2] = ram_[start + column + 2];
name_[3] = ram_[start + column + 3];
// TODO: should 80-column mode use alternate page access?
} break;
default: break;
@ -523,12 +522,12 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
case ScreenMode::YamahaText80: {
const auto column = AddressT(Storage<personality>::data_block_);
Storage<personality>::data_block_ += 4;
Storage<personality>::data_block_ += 2;
const AddressT start = pattern_generator_table_address_ & (0x1f800 | (y & 7));
line_buffer.patterns[column + 0][0] = ram_[start + AddressT(name_[0] << 3)];
line_buffer.patterns[column + 1][0] = ram_[start + AddressT(name_[1] << 3)];
line_buffer.patterns[column + 0][1] = ram_[start + AddressT(name_[2] << 3)];
line_buffer.patterns[column + 0][1] = ram_[start + AddressT(name_[1] << 3)];
line_buffer.patterns[column + 1][0] = ram_[start + AddressT(name_[2] << 3)];
line_buffer.patterns[column + 1][1] = ram_[start + AddressT(name_[3] << 3)];
} break;