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https://github.com/TomHarte/CLK.git
synced 2025-02-03 22:33:29 +00:00
[Mostly] avoid magic address constants; avoid duplication of TMS fetching logic.
This commit is contained in:
Thomas Harte
parent
c140f370fe
commit
88eaa4ff02
@ -296,6 +296,12 @@ void TMS9918<personality>::run_for(const HalfCycles cycles) {
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if(this->fetch_pointer_.column == Timing<personality>::CyclesPerLine) {
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this->fetch_pointer_.column = 0;
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this->fetch_pointer_.row = (this->fetch_pointer_.row + 1) % this->mode_timing_.total_lines;
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// Reset sprite collection, which will be for the line after the new one.
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LineBuffer &next_sprite_buffer = this->line_buffers_[(this->fetch_pointer_.row + 1) % this->mode_timing_.total_lines];
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next_sprite_buffer.reset_sprite_collection();
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// Yamaha: handle blinking.
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if constexpr (is_yamaha_vdp(personality)) {
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if(!this->fetch_pointer_.row && Storage<personality>::blink_periods_) {
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--Storage<personality>::blink_counter_;
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@ -75,6 +75,28 @@ template<bool use_end, typename Fetcher> void Base<personality>::dispatch(Fetche
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#undef index
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}
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/// @returns An instance of @c AddressT with all top bits set down to and including
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/// bit @c end and all others clear.
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///
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/// So e.g. if @c AddressT is @c uint16_t and this VDP has a 15-bit address space then
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/// @c top_bits<10> will be the address with bits 15 to 10 (inclusive) set and the rest clear.
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template <typename AddressT, int end> constexpr AddressT top_bits() {
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return AddressT(~0) - AddressT((1 << end) - 1);
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}
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/// Modifies and returns @c source so that all bits above position @c bits are set; the others are unmodified.
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template <typename AddressT, int bits> constexpr AddressT n_bit(AddressT source) {
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return AddressT(source | top_bits<AddressT, bits>());
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}
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// Various convenience functions for the above; bitsX can be used to wrap a number that is internally only X bits big.
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template <typename AddressT> constexpr AddressT bits6(AddressT source = 0) { return n_bit<AddressT, 6>(source); }
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template <typename AddressT> constexpr AddressT bits7(AddressT source = 0) { return n_bit<AddressT, 7>(source); }
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template <typename AddressT> constexpr AddressT bits8(AddressT source = 0) { return n_bit<AddressT, 8>(source); }
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template <typename AddressT> constexpr AddressT bits10(AddressT source = 0) { return n_bit<AddressT, 10>(source); }
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template <typename AddressT> constexpr AddressT bits11(AddressT source = 0) { return n_bit<AddressT, 11>(source); }
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template <typename AddressT> constexpr AddressT bits13(AddressT source = 0) { return n_bit<AddressT, 13>(source); }
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// MARK: - TMS fetcher definitions.
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template <Personality personality>
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@ -97,8 +119,8 @@ struct TextFetcher {
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TextFetcher(Base<personality> *base, LineBuffer &buffer, int y) :
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base(base),
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line_buffer(buffer),
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row_base(base->pattern_name_address_ & (0x3c00 | size_t(y >> 3) * 40)),
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row_offset(base->pattern_generator_table_address_ & (0x3800 | (y & 7))) {}
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row_base(base->pattern_name_address_ & bits10(AddressT((y >> 3) * 40))),
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row_offset(base->pattern_generator_table_address_ & bits11(AddressT(y & 7))) {}
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template <int cycle> void fetch() {
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// The first 47 and the final 4 slots are external.
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@ -110,13 +132,21 @@ struct TextFetcher {
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constexpr int offset = cycle - 47;
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constexpr auto column = AddressT(offset / 3);
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switch(offset % 3) {
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case 0: base->name_[0] = base->ram_[row_base + column]; break; // (1) fetch tile name.
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case 1: base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle)); break; // (2) external slot.
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case 2: line_buffer.characters.shapes[column] = base->ram_[row_offset + size_t(base->name_[0] << 3)]; break; // (3) fetch tile pattern.
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case 0: fetch_name(column); break; // (1) fetch tile name.
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case 1: base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle)); break; // (2) external slot.
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case 2: fetch_pattern(column); break; // (3) fetch tile pattern.
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}
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}
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}
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void fetch_name(AddressT column) {
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base->name_[0] = base->ram_[row_base + column];
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}
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void fetch_pattern(AddressT column) {
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line_buffer.characters.shapes[column] = base->ram_[row_offset + size_t(base->name_[0] << 3)];
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}
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Base<personality> *const base;
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LineBuffer &line_buffer;
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const AddressT row_base;
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@ -132,7 +162,7 @@ struct CharacterFetcher {
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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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row_base(base->pattern_name_address_ & (AddressT((y << 2)&~31) | 0x3c00))
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row_base(base->pattern_name_address_ & bits10(AddressT((y << 2)&~31)))
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{
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pattern_base = base->pattern_generator_table_address_;
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colour_base = base->colour_table_address_;
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@ -140,20 +170,20 @@ struct CharacterFetcher {
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if(buffer.screen_mode == ScreenMode::Graphics) {
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// If this is high resolution mode, allow the row number to affect the pattern and colour addresses.
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pattern_base &= AddressT(0x2000 | ((y & 0xc0) << 5));
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colour_base &= AddressT(0x2000 | ((y & 0xc0) << 5));
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pattern_base &= bits13(AddressT(((y & 0xc0) << 5)));
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colour_base &= bits13(AddressT(((y & 0xc0) << 5)));
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colour_base += AddressT(y & 7);
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colour_name_shift = 0;
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} else {
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colour_base &= size_t(0xffc0);
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pattern_base &= size_t(0x3800);
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colour_base &= bits6<AddressT>();
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pattern_base &= bits11<AddressT>();
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}
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if(buffer.screen_mode == ScreenMode::MultiColour) {
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pattern_base += size_t((y >> 2) & 7);
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pattern_base += AddressT((y >> 2) & 7);
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} else {
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pattern_base += size_t(y & 7);
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pattern_base += AddressT(y & 7);
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}
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}
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@ -164,11 +194,11 @@ struct CharacterFetcher {
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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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fetch_sprite_coordinates(0);
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fetch_sprite_graphics(0);
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fetch_sprite_coordinates(1);
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fetch_sprite_graphics(1);
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fetch_sprite_coordinates(2);
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fetch_sprite_location(0);
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fetch_sprite_pattern(0);
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fetch_sprite_location(1);
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fetch_sprite_pattern(1);
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fetch_sprite_location(2);
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}
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if(cycle > 16 && cycle < 21) {
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@ -177,12 +207,9 @@ struct CharacterFetcher {
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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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fetch_sprite_graphics(2);
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fetch_sprite_coordinates(3);
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fetch_sprite_graphics(3);
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// All patterns now fetched, reset sprite selection.
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sprite_selection_buffer.reset_sprite_collection();
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fetch_sprite_pattern(2);
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fetch_sprite_location(3);
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fetch_sprite_pattern(3);
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}
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if(cycle >= 31 && cycle < 35) {
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@ -201,7 +228,7 @@ struct CharacterFetcher {
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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: base->tile_offset_ = base->ram_[(row_base + AddressT(block)) & 0x3fff]; break;
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case 0: fetch_tile_name(block); break;
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case 1:
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if(!(block & 3)) {
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base->do_external_slot(to_internal<personality, Clock::TMSMemoryWindow>(cycle));
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@ -211,37 +238,49 @@ struct CharacterFetcher {
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}
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break;
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case 3:
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tile_buffer.tiles.patterns[block][0] = base->ram_[(pattern_base + AddressT(base->tile_offset_ << 3)) & 0x3fff];
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tile_buffer.tiles.patterns[block][1] = base->ram_[(colour_base + AddressT((base->tile_offset_ << 3) >> colour_name_shift)) & 0x3fff];
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fetch_tile_pattern(block);
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fetch_tile_colour(block);
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break;
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default: break;
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}
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}
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}
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void fetch_sprite_coordinates(int sprite) {
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void fetch_sprite_location(int sprite) {
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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_ & AddressT(0x3f81 | (tile_buffer.active_sprites[sprite].index << 2))
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base->sprite_attribute_table_address_ & bits7(AddressT((tile_buffer.active_sprites[sprite].index << 2) | 1))
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];
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}
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void fetch_sprite_graphics(int sprite) {
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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_ & AddressT(0x3f82 | (tile_buffer.active_sprites[sprite].index << 2))
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base->sprite_attribute_table_address_ & bits7(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_ & AddressT(0x3f83 | (tile_buffer.active_sprites[sprite].index << 2))
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base->sprite_attribute_table_address_ & bits7(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 size_t graphic_location = base->sprite_generator_table_address_ & size_t(0x3800 | (name << 3) | tile_buffer.active_sprites[sprite].row);
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const AddressT graphic_location = base->sprite_generator_table_address_ & bits11(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_ & AddressT((sprite << 2) | 0x3f80)], y);
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base->posit_sprite(sprite_selection_buffer, sprite, base->ram_[base->sprite_attribute_table_address_ & bits7(AddressT(sprite << 2))], y);
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}
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void fetch_tile_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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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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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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Base<personality> *const base;
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@ -300,11 +339,11 @@ struct SMSFetcher {
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// Determine row info for the screen both (i) if vertical scrolling is applied; and (ii) if it isn't.
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// The programmer can opt out of applying vertical scrolling to the right-hand portion of the display.
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const int scrolled_row = (y + storage->latched_vertical_scroll_) % (is_tall_mode ? 256 : 224);
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scrolled_row_info.pattern_address_base = AddressT((pattern_name_address & size_t(((scrolled_row & ~7) << 3) | 0x3800)) - pattern_name_offset);
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scrolled_row_info.pattern_address_base = pattern_name_address & bits11(AddressT((scrolled_row & ~7) << 3)) - pattern_name_offset;
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scrolled_row_info.sub_row[0] = AddressT((scrolled_row & 7) << 2);
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scrolled_row_info.sub_row[1] = AddressT(28 ^ ((scrolled_row & 7) << 2));
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if(storage->vertical_scroll_lock_) {
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static_row_info.pattern_address_base = AddressT((pattern_name_address & AddressT(((y & ~7) << 3) | 0x3800)) - pattern_name_offset);
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static_row_info.pattern_address_base = bits11(AddressT(pattern_name_address & ((y & ~7) << 3))) - pattern_name_offset;
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static_row_info.sub_row[0] = AddressT((y & 7) << 2);
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static_row_info.sub_row[1] = 28 ^ AddressT((y & 7) << 2);
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} else static_row_info = scrolled_row_info;
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@ -327,7 +366,6 @@ struct SMSFetcher {
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fetch_sprite(5);
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fetch_sprite(6);
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fetch_sprite(7);
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sprite_selection_buffer.reset_sprite_collection();
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}
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if(cycle == 29 || cycle == 30) {
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@ -359,12 +397,7 @@ struct SMSFetcher {
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posit_sprite(sprite+1);
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}
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break;
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case 2:
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tile_buffer.tiles.patterns[block][0] = base->ram_[base->tile_offset_];
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tile_buffer.tiles.patterns[block][1] = base->ram_[base->tile_offset_+1];
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tile_buffer.tiles.patterns[block][2] = base->ram_[base->tile_offset_+2];
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tile_buffer.tiles.patterns[block][3] = base->ram_[base->tile_offset_+3];
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break;
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case 2: fetch_tile_pattern(block); break;
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}
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}
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@ -376,15 +409,15 @@ struct SMSFetcher {
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void fetch_sprite(int sprite) {
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tile_buffer.active_sprites[sprite].x =
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base->ram_[
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storage->sprite_attribute_table_address_ & size_t(0x3f80 | (tile_buffer.active_sprites[sprite].index << 1))
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storage->sprite_attribute_table_address_ & bits7((tile_buffer.active_sprites[sprite].index << 1) | 0)
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] - (storage->shift_sprites_8px_left_ ? 8 : 0);
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const uint8_t name = base->ram_[
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storage->sprite_attribute_table_address_ & size_t(0x3f81 | (tile_buffer.active_sprites[sprite].index << 1))
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storage->sprite_attribute_table_address_ & bits7((tile_buffer.active_sprites[sprite].index << 1) | 1)
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] & (base->sprites_16x16_ ? ~1 : ~0);
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const AddressT graphic_location =
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storage->sprite_generator_table_address_ &
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AddressT(0x2000 | (name << 5) | (tile_buffer.active_sprites[sprite].row << 2));
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bits13(AddressT((name << 5) | (tile_buffer.active_sprites[sprite].row << 2)));
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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+1];
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tile_buffer.active_sprites[sprite].image[2] = base->ram_[graphic_location+2];
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@ -400,8 +433,15 @@ struct SMSFetcher {
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) + row_info.sub_row[(tile_buffer.tiles.flags[column]&4) >> 2];
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}
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void fetch_tile_pattern(int column) {
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tile_buffer.tiles.patterns[column][0] = base->ram_[base->tile_offset_];
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tile_buffer.tiles.patterns[column][1] = base->ram_[base->tile_offset_+1];
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tile_buffer.tiles.patterns[column][2] = base->ram_[base->tile_offset_+2];
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tile_buffer.tiles.patterns[column][3] = base->ram_[base->tile_offset_+3];
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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_[storage->sprite_attribute_table_address_ & (sprite | 0x3f00)], y);
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base->posit_sprite(sprite_selection_buffer, sprite, base->ram_[storage->sprite_attribute_table_address_ & bits8(AddressT(sprite))], y);
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}
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Base<personality> *const base;
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@ -428,6 +468,9 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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const AddressT rotated_name_ = pattern_name_address_ >> 1;
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const uint8_t *const ram2 = &ram_[65536];
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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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using Type = typename Storage<personality>::Event::Type;
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while(Storage<personality>::next_event_->offset < end) {
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switch(Storage<personality>::next_event_->type) {
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@ -443,6 +486,10 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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name_[0] = ram_[start + column + 0];
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name_[1] = ram_[start + column + 1];
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// TODO: use fetcher after resolving ambiguity over name_[0]/name_[1]/etc.
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// text_fetcher.fetch_name(column);
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// text_fetcher.fetch_name(column + 1);
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} break;
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case ScreenMode::YamahaText80: {
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@ -455,10 +502,11 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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name_[3] = ram_[start + column + 3];
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} break;
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case ScreenMode::Graphics: {
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const auto row_base = pattern_name_address_ & (AddressT((y << 2)&~31) | 0x1fc00);
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tile_offset_ = ram_[(row_base + Storage<personality>::next_event_->id) & 0x1ffff];
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} break;
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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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break;
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default: break;
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}
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@ -472,11 +520,11 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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line_buffer.characters.flags[column] = ram_[address + column];
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} break;
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case ScreenMode::Graphics: {
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const auto colour_base = (colour_table_address_ & (0x2000 | ((y & 0xc0) << 5))) + (y & 7);
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line_buffer.tiles.patterns[Storage<personality>::next_event_->id][1] =
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ram_[colour_base + AddressT((tile_offset_ << 3)) & 0x1ffff];
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} break;
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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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break;
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default: break;
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}
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@ -491,6 +539,9 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
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const AddressT start = pattern_generator_table_address_ & (0x1f800 | (y & 7));
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line_buffer.characters.shapes[column + 0] = ram_[start + AddressT(name_[0] << 3)];
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line_buffer.characters.shapes[column + 1] = ram_[start + AddressT(name_[1] << 3)];
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// text_fetcher.fetch_pattern(column);
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// text_fetcher.fetch_pattern(column + 1);
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} break;
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|
||||
case ScreenMode::YamahaText80: {
|
||||
@ -504,11 +555,11 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
|
||||
line_buffer.characters.shapes[column + 3] = ram_[start + AddressT(name_[3] << 3)];
|
||||
} break;
|
||||
|
||||
case ScreenMode::Graphics: {
|
||||
const auto pattern_base = (pattern_generator_table_address_ & (0x2000 | ((y & 0xc0) << 5))) + (y & 7);
|
||||
line_buffer.tiles.patterns[Storage<personality>::next_event_->id][0] =
|
||||
ram_[(pattern_base + AddressT(tile_offset_ << 3)) & 0x1ffff];
|
||||
} break;
|
||||
case ScreenMode::Graphics:
|
||||
case ScreenMode::MultiColour:
|
||||
case ScreenMode::ColouredText:
|
||||
character_fetcher.fetch_tile_pattern(Storage<personality>::next_event_->id);
|
||||
break;
|
||||
|
||||
default: break;
|
||||
}
|
||||
@ -516,41 +567,37 @@ template<ScreenMode mode> void Base<personality>::fetch_yamaha(LineBuffer &line_
|
||||
|
||||
case Type::SpriteY:
|
||||
switch(mode) {
|
||||
default:
|
||||
posit_sprite(next_line_buffer, Storage<personality>::next_event_->id, ram_[sprite_attribute_table_address_ & AddressT((Storage<personality>::next_event_->id << 2) | 0x1ff80)], y);
|
||||
if(Storage<personality>::next_event_->id == 31) {
|
||||
next_line_buffer.reset_sprite_collection();
|
||||
}
|
||||
case ScreenMode::Graphics:
|
||||
case ScreenMode::MultiColour:
|
||||
case ScreenMode::ColouredText:
|
||||
character_fetcher.posit_sprite(Storage<personality>::next_event_->id);
|
||||
break;
|
||||
|
||||
default: break;
|
||||
}
|
||||
break;
|
||||
|
||||
case Type::SpriteLocation:
|
||||
switch(mode) {
|
||||
default:
|
||||
line_buffer.active_sprites[Storage<personality>::next_event_->id].x =
|
||||
ram_[
|
||||
sprite_attribute_table_address_ & AddressT(0x1ff81 | (line_buffer.active_sprites[Storage<personality>::next_event_->id].index << 2))
|
||||
];
|
||||
case ScreenMode::Graphics:
|
||||
case ScreenMode::MultiColour:
|
||||
case ScreenMode::ColouredText:
|
||||
character_fetcher.fetch_sprite_location(Storage<personality>::next_event_->id);
|
||||
break;
|
||||
|
||||
default: break;
|
||||
}
|
||||
break;
|
||||
|
||||
case Type::SpritePattern:
|
||||
switch(mode) {
|
||||
default: {
|
||||
const uint8_t name = ram_[
|
||||
sprite_attribute_table_address_ & AddressT(0x1ff82 | (line_buffer.active_sprites[Storage<personality>::next_event_->id].index << 2))
|
||||
] & (sprites_16x16_ ? ~3 : ~0);
|
||||
line_buffer.active_sprites[Storage<personality>::next_event_->id].image[2] = ram_[
|
||||
sprite_attribute_table_address_ & AddressT(0x1ff83 | (line_buffer.active_sprites[Storage<personality>::next_event_->id].index << 2))
|
||||
];
|
||||
line_buffer.active_sprites[Storage<personality>::next_event_->id].x -= (line_buffer.active_sprites[Storage<personality>::next_event_->id].image[2] & 0x80) >> 2;
|
||||
case ScreenMode::Graphics:
|
||||
case ScreenMode::MultiColour:
|
||||
case ScreenMode::ColouredText:
|
||||
character_fetcher.fetch_sprite_pattern(Storage<personality>::next_event_->id);
|
||||
break;
|
||||
|
||||
const size_t graphic_location = sprite_generator_table_address_ & AddressT(0x1f800 | (name << 3) | line_buffer.active_sprites[Storage<personality>::next_event_->id].row);
|
||||
line_buffer.active_sprites[Storage<personality>::next_event_->id].image[0] = ram_[graphic_location];
|
||||
line_buffer.active_sprites[Storage<personality>::next_event_->id].image[1] = ram_[graphic_location+16];
|
||||
} break;
|
||||
default: break;
|
||||
}
|
||||
break;
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user