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Create a dedicated sprite fetcher.
This commit is contained in:
Thomas Harte
parent
5eae11434a
commit
6db939f48f
@ -151,46 +151,15 @@ struct CharacterFetcher {
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}
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}
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template <bool fetch_name = false> void fetch_sprite_location(int sprite, [[maybe_unused]] int name_slot = 0) {
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tile_buffer.active_sprites[sprite].x =
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base->ram_[
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base->sprite_attribute_table_address_ & bits<7>(AddressT((tile_buffer.active_sprites[sprite].index << 2) | 1))
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];
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if constexpr (fetch_name) {
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base->name_[name_slot] = base->ram_[
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base->sprite_attribute_table_address_ & bits<7>(AddressT((tile_buffer.active_sprites[sprite].index << 2) | 2))
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] & (base->sprites_16x16_ ? ~3 : ~0);
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}
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}
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void fetch_sprite_pattern(int sprite) {
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const uint8_t name = base->ram_[
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base->sprite_attribute_table_address_ & bits<7>(AddressT((tile_buffer.active_sprites[sprite].index << 2) | 2))
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] & (base->sprites_16x16_ ? ~3 : ~0);
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tile_buffer.active_sprites[sprite].image[2] = base->ram_[
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base->sprite_attribute_table_address_ & bits<7>(AddressT((tile_buffer.active_sprites[sprite].index << 2) | 3))
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];
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tile_buffer.active_sprites[sprite].x -= (tile_buffer.active_sprites[sprite].image[2] & 0x80) >> 2;
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const AddressT graphic_location = base->sprite_generator_table_address_ & bits<11>(AddressT((name << 3) | tile_buffer.active_sprites[sprite].row));
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tile_buffer.active_sprites[sprite].image[0] = base->ram_[graphic_location];
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tile_buffer.active_sprites[sprite].image[1] = base->ram_[graphic_location+16];
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}
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void posit_sprite(int sprite) {
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base->posit_sprite(sprite_selection_buffer, sprite, base->ram_[base->sprite_attribute_table_address_ & bits<7>(AddressT(sprite << 2))], y);
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}
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void fetch_tile_name(int column) {
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void fetch_name(int column) {
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base->tile_offset_ = base->ram_[row_base + AddressT(column)];
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}
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void fetch_tile_pattern(int column) {
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void fetch_pattern(int column) {
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tile_buffer.tiles.patterns[column][0] = base->ram_[pattern_base + AddressT(base->tile_offset_ << 3)];
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}
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void fetch_tile_colour(int column) {
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void fetch_colour(int column) {
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tile_buffer.tiles.patterns[column][1] = base->ram_[colour_base + AddressT((base->tile_offset_ << 3) >> colour_name_shift)];
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}
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@ -204,6 +173,74 @@ struct CharacterFetcher {
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int colour_name_shift;
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};
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enum class SpriteMode {
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Mode1,
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Mode2,
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// MasterSystem,
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};
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constexpr SpriteMode sprite_mode(ScreenMode screen_mode) {
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switch(screen_mode) {
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default:
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return SpriteMode::Mode2;
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case ScreenMode::MultiColour:
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case ScreenMode::ColouredText:
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case ScreenMode::Graphics:
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return SpriteMode::Mode1;
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// case ScreenMode::SMSMode4:
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// return SpriteMode::MasterSystem;
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}
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}
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template <Personality personality, SpriteMode mode>
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struct SpriteFetcher {
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using AddressT = typename Base<personality>::AddressT;
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SpriteFetcher(Base<personality> *base, LineBuffer &buffer, LineBuffer &sprite_selection_buffer, int y) :
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base(base),
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tile_buffer(buffer),
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sprite_selection_buffer(sprite_selection_buffer),
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y(y) {}
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void fetch_location(int slot, [[maybe_unused]] int name_slot = 0) {
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tile_buffer.active_sprites[slot].x =
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base->ram_[
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base->sprite_attribute_table_address_ & bits<7>(AddressT((tile_buffer.active_sprites[slot].index << 2) | 1))
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];
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if constexpr (mode == SpriteMode::Mode2) {
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base->name_[name_slot] = base->ram_[
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base->sprite_attribute_table_address_ & bits<7>(AddressT((tile_buffer.active_sprites[slot].index << 2) | 2))
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] & (base->sprites_16x16_ ? ~3 : ~0);
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}
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}
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void fetch_pattern(int slot) {
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const uint8_t name = base->ram_[
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base->sprite_attribute_table_address_ & bits<7>(AddressT((tile_buffer.active_sprites[slot].index << 2) | 2))
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] & (base->sprites_16x16_ ? ~3 : ~0);
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tile_buffer.active_sprites[slot].image[2] = base->ram_[
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base->sprite_attribute_table_address_ & bits<7>(AddressT((tile_buffer.active_sprites[slot].index << 2) | 3))
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];
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tile_buffer.active_sprites[slot].x -= (tile_buffer.active_sprites[slot].image[2] & 0x80) >> 2;
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const AddressT graphic_location = base->sprite_generator_table_address_ & bits<11>(AddressT((name << 3) | tile_buffer.active_sprites[slot].row));
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tile_buffer.active_sprites[slot].image[0] = base->ram_[graphic_location];
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tile_buffer.active_sprites[slot].image[1] = base->ram_[graphic_location+16];
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}
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void fetch_y(int sprite) {
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base->posit_sprite(sprite_selection_buffer, sprite, base->ram_[base->sprite_attribute_table_address_ & bits<7>(AddressT(sprite << 2))], y);
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}
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Base<personality> *const base;
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LineBuffer &tile_buffer;
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LineBuffer &sprite_selection_buffer;
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const int y;
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};
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template <Personality personality>
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struct SMSFetcher {
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using AddressT = typename Base<personality>::AddressT;
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@ -329,41 +366,43 @@ struct TextSequencer {
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template <Personality personality>
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struct CharacterSequencer {
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template <typename... Args> CharacterSequencer(Args&&... args) : fetcher(std::forward<Args>(args)...) {}
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template <typename... Args> CharacterSequencer(Args&&... args) :
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character_fetcher(std::forward<Args>(args)...),
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sprite_fetcher(std::forward<Args>(args)...) {}
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template <int cycle> void fetch() {
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if(cycle < 2) {
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fetcher.base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle));
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character_fetcher.base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle));
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}
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if(cycle == 2) {
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// Fetch: y0, x0, n0, c0, pat0a, pat0b, y1, x1, n1, c1, pat1a, pat1b, y2, x2.
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fetcher.fetch_sprite_location(0);
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fetcher.fetch_sprite_pattern(0);
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fetcher.fetch_sprite_location(1);
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fetcher.fetch_sprite_pattern(1);
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fetcher.fetch_sprite_location(2);
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sprite_fetcher.fetch_location(0);
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sprite_fetcher.fetch_pattern(0);
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sprite_fetcher.fetch_location(1);
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sprite_fetcher.fetch_pattern(1);
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sprite_fetcher.fetch_location(2);
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}
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if(cycle > 16 && cycle < 21) {
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fetcher.base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle));
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character_fetcher.base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle));
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}
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if(cycle == 21) {
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// Fetch: n1, c2, pat2a, pat2b, y3, x3, n3, c3, pat3a, pat3b.
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fetcher.fetch_sprite_pattern(2);
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fetcher.fetch_sprite_location(3);
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fetcher.fetch_sprite_pattern(3);
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sprite_fetcher.fetch_pattern(2);
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sprite_fetcher.fetch_location(3);
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sprite_fetcher.fetch_pattern(3);
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}
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if(cycle >= 31 && cycle < 35) {
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fetcher.base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle));
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character_fetcher.base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle));
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}
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// Cycles 35 to 43: fetch 8 new sprite Y coordinates, to begin selecting sprites for next line.
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if(cycle == 35) {
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fetcher.posit_sprite(0); fetcher.posit_sprite(1); fetcher.posit_sprite(2); fetcher.posit_sprite(3);
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fetcher.posit_sprite(4); fetcher.posit_sprite(5); fetcher.posit_sprite(6); fetcher.posit_sprite(7);
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sprite_fetcher.fetch_y(0); sprite_fetcher.fetch_y(1); sprite_fetcher.fetch_y(2); sprite_fetcher.fetch_y(3);
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sprite_fetcher.fetch_y(4); sprite_fetcher.fetch_y(5); sprite_fetcher.fetch_y(6); sprite_fetcher.fetch_y(7);
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}
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// Rest of line: tiles themselves, plus some additional potential sprites.
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@ -372,18 +411,18 @@ struct CharacterSequencer {
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constexpr int block = offset >> 2;
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constexpr int sub_block = offset & 3;
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switch(sub_block) {
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case 0: fetcher.fetch_tile_name(block); break;
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case 0: character_fetcher.fetch_name(block); break;
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case 1:
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if(!(block & 3)) {
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fetcher.base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle));
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character_fetcher.base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle));
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} else {
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constexpr int sprite = 8 + ((block >> 2) * 3) + ((block & 3) - 1);
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fetcher.posit_sprite(sprite);
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sprite_fetcher.fetch_y(sprite);
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}
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break;
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case 3:
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fetcher.fetch_tile_pattern(block);
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fetcher.fetch_tile_colour(block);
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character_fetcher.fetch_pattern(block);
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character_fetcher.fetch_pattern(block);
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break;
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default: break;
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}
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@ -391,7 +430,8 @@ struct CharacterSequencer {
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}
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using AddressT = typename Base<personality>::AddressT;
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CharacterFetcher<personality> fetcher;
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CharacterFetcher<personality> character_fetcher;
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SpriteFetcher<personality, SpriteMode::Mode1> sprite_fetcher;
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};
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// MARK: - TMS fetch routines.
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@ -498,6 +538,7 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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CharacterFetcher character_fetcher(this, line_buffer, next_line_buffer, y);
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TextFetcher text_fetcher(this, line_buffer, y);
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SpriteFetcher<personality, sprite_mode(mode)> sprite_fetcher(this, line_buffer, next_line_buffer, y);
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using Type = typename Storage<personality>::Event::Type;
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while(Storage<personality>::next_event_->offset < end) {
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@ -528,7 +569,7 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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case ScreenMode::Graphics:
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case ScreenMode::MultiColour:
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case ScreenMode::ColouredText:
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character_fetcher.fetch_tile_name(Storage<personality>::next_event_->id);
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character_fetcher.fetch_name(Storage<personality>::next_event_->id);
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break;
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default: break;
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@ -546,7 +587,7 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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case ScreenMode::Graphics:
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case ScreenMode::MultiColour:
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case ScreenMode::ColouredText:
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character_fetcher.fetch_tile_colour(Storage<personality>::next_event_->id);
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character_fetcher.fetch_colour(Storage<personality>::next_event_->id);
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break;
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default: break;
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@ -575,16 +616,16 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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case ScreenMode::Graphics:
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case ScreenMode::MultiColour:
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case ScreenMode::ColouredText:
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character_fetcher.fetch_tile_pattern(Storage<personality>::next_event_->id);
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character_fetcher.fetch_pattern(Storage<personality>::next_event_->id);
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break;
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case ScreenMode::YamahaGraphics3:
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// As per comment elsewhere; my _guess_ is that G3 is slotted as if it were
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// a bitmap mode, with the three bytes that describe each column fitting into
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// the relevant windows.
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character_fetcher.fetch_tile_name(Storage<personality>::next_event_->id);
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character_fetcher.fetch_tile_colour(Storage<personality>::next_event_->id);
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character_fetcher.fetch_tile_pattern(Storage<personality>::next_event_->id);
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character_fetcher.fetch_name(Storage<personality>::next_event_->id);
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character_fetcher.fetch_colour(Storage<personality>::next_event_->id);
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character_fetcher.fetch_pattern(Storage<personality>::next_event_->id);
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break;
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case ScreenMode::YamahaGraphics4:
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@ -627,7 +668,7 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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break;
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default:
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character_fetcher.posit_sprite(Storage<personality>::next_event_->id);
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sprite_fetcher.fetch_y(Storage<personality>::next_event_->id);
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break;
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}
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break;
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@ -643,12 +684,13 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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case ScreenMode::Graphics:
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case ScreenMode::MultiColour:
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case ScreenMode::ColouredText:
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character_fetcher.fetch_sprite_location(Storage<personality>::next_event_->id);
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sprite_fetcher.fetch_location(Storage<personality>::next_event_->id);
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break;
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default:
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character_fetcher.template fetch_sprite_location<true>(Storage<personality>::next_event_->id, 0);
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character_fetcher.template fetch_sprite_location<true>(Storage<personality>::next_event_->id + 1, 1);
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// TODO: should responsibility for two fetches be in the sprite fetcher?
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sprite_fetcher.fetch_location(Storage<personality>::next_event_->id, 0);
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sprite_fetcher.fetch_location(Storage<personality>::next_event_->id + 1, 1);
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break;
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}
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break;
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@ -664,7 +706,7 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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case ScreenMode::Graphics:
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case ScreenMode::MultiColour:
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case ScreenMode::ColouredText:
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character_fetcher.fetch_sprite_pattern(Storage<personality>::next_event_->id);
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sprite_fetcher.fetch_pattern(Storage<personality>::next_event_->id);
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break;
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default: break;
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