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Fill in missing rasterisers.

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This commit is contained in:
Thomas Harte 2023-03-01 23:19:33 -05:00
parent 318cfab67d
commit 4c1973adc8
1 changed files with 60 additions and 13 deletions
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73
Components/9918/Implementation/Draw.hpp
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@ -435,35 +435,82 @@ void Base<personality>::draw_sms(int start, int end, uint32_t cram_dot) {
// MARK: - Yamaha
template <int start> struct YamahaPlotter {
static void draw_4bpp(LineBuffer &buffer, int column, uint32_t *target, const std::array<uint32_t, 16> &palette) {
switch(start) {
case 0: target[0] = palette[buffer.bitmap[column] >> 4]; [[fallthrough]];
case 1: target[1] = palette[buffer.bitmap[column] & 0xf]; [[fallthrough]];
}
}
static void draw_2bpp(LineBuffer &buffer, int column, uint32_t *target, const std::array<uint32_t, 16> &palette) {
switch(start) {
case 0: target[0] = palette[buffer.bitmap[column] >> 6]; [[fallthrough]];
case 1: target[1] = palette[(buffer.bitmap[column] >> 4) & 3]; [[fallthrough]];
case 2: target[2] = palette[(buffer.bitmap[column] >> 2) & 3]; [[fallthrough]];
case 3: target[3] = palette[buffer.bitmap[column] & 3]; [[fallthrough]];
}
}
};
template <Personality personality>
template <ScreenMode mode>
void Base<personality>::draw_yamaha(LineBuffer &buffer, int start, int end) {
// TODO: Many other graphics modes.
// TODO: much smarter loops. Duff plus a tail?
const auto active_palette = palette();
const int sprite_start = start >> 2;
const int sprite_end = end >> 2;
if constexpr (mode == ScreenMode::YamahaGraphics4) {
for(int c = start >> 2; c < end >> 2; c++) {
pixel_target_[c] = active_palette[
buffer.bitmap[c >> 1] >> ((((c & 1) ^ 1) << 2)) & 0xf
];
if constexpr (mode == ScreenMode::YamahaGraphics4 || mode == ScreenMode::YamahaGraphics6) {
start >>= (mode == ScreenMode::YamahaGraphics4) ? 2 : 1;
end >>= (mode == ScreenMode::YamahaGraphics4) ? 2 : 1;
switch(start & 1) {
default: break;
case 1: YamahaPlotter<1>::draw_4bpp(buffer, start >> 1, &pixel_target_[start], active_palette); ++start; break;
}
while(start < end) {
YamahaPlotter<0>::draw_4bpp(buffer, start >> 1, &pixel_target_[start], active_palette);
start += 2;
}
}
if constexpr (mode == ScreenMode::YamahaGraphics5) {
for(int c = start >> 1; c < end >> 1; c++) {
pixel_target_[c] = active_palette[
buffer.bitmap[c >> 2] >> ((((c & 3) ^ 3) << 1)) & 3
];
start >>= 1;
end >>= 1;
switch(start & 3) {
default: break;
case 1: YamahaPlotter<1>::draw_2bpp(buffer, start >> 2, &pixel_target_[start], active_palette); start += 3; break;
case 2: YamahaPlotter<2>::draw_2bpp(buffer, start >> 2, &pixel_target_[start], active_palette); start += 2; break;
case 3: YamahaPlotter<3>::draw_2bpp(buffer, start >> 2, &pixel_target_[start], active_palette); start += 1; break;
}
while(start < end) {
YamahaPlotter<0>::draw_2bpp(buffer, start >> 2, &pixel_target_[start], active_palette);
start += 4;
}
}
if constexpr (mode == ScreenMode::YamahaGraphics7) {
start >>= 2;
end >>= 2;
while(start < end) {
pixel_target_[start] =
palette_pack(
uint8_t((buffer.bitmap[start] & 0xe0) + ((buffer.bitmap[start] & 0xe0) >> 3) + ((buffer.bitmap[start] & 0xe0) >> 6)),
uint8_t((buffer.bitmap[start] & 0x1c) + ((buffer.bitmap[start] & 0x1c) << 3) + ((buffer.bitmap[start] & 0x1c) >> 3)),
uint8_t((buffer.bitmap[start] & 0x03) + ((buffer.bitmap[start] & 0x03) << 2) + ((buffer.bitmap[start] & 0x03) << 4) + ((buffer.bitmap[start] & 0x03) << 6))
);
++start;
}
}
// TODO: in Graphics7, indicate fixed sprite colours.
// Possibly TODO: is the data-sheet trying to allege some sort of colour mixing for sprites in Mode 6?
draw_sprites<
SpriteMode::Mode2,
mode == ScreenMode::YamahaGraphics5 || mode == ScreenMode::YamahaGraphics6
>(buffer, start >> 2, end >> 2);
>(buffer, sprite_start, sprite_end);
}
template <Personality personality>