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Switch to ahead-of-time planar to chunky conversion.
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Thomas Harte
parent
0dc9c4cee1
commit
c3c84c88a1
@ -171,44 +171,20 @@ template <int cycle> void Chipset::output() {
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}
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if(pixels_) {
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// TODO: this is obviously nonsense. Probably do a table-based
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// planar-to-chunky up front into 8-bit pockets, and just shift that.
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// TODO: this doesn't support dual playfields; use an alternative
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// palette table for that.
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pixels_[0] = palette_[
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((current_bitplanes_[0]&0x8000) >> 15) |
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((current_bitplanes_[1]&0x8000) >> 14) |
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((current_bitplanes_[2]&0x8000) >> 13) |
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((current_bitplanes_[3]&0x8000) >> 12) |
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((current_bitplanes_[4]&0x8000) >> 11)
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];
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current_bitplanes_ <<= is_high_res_;
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pixels_[0] = palette_[bitplane_pixels_ >> 120];
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bitplane_pixels_ <<= is_high_res_ * 8;
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pixels_[1] = palette_[
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((current_bitplanes_[0]&0x8000) >> 15) |
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((current_bitplanes_[1]&0x8000) >> 14) |
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((current_bitplanes_[2]&0x8000) >> 13) |
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((current_bitplanes_[3]&0x8000) >> 12) |
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((current_bitplanes_[4]&0x8000) >> 11)
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];
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current_bitplanes_ <<= 1;
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pixels_[1] = palette_[bitplane_pixels_ >> 120];
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bitplane_pixels_ <<= 8;
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pixels_[2] = palette_[
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((current_bitplanes_[0]&0x8000) >> 15) |
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((current_bitplanes_[1]&0x8000) >> 14) |
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((current_bitplanes_[2]&0x8000) >> 13) |
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((current_bitplanes_[3]&0x8000) >> 12) |
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((current_bitplanes_[4]&0x8000) >> 11)
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];
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current_bitplanes_ <<= is_high_res_;
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pixels_[2] = palette_[bitplane_pixels_ >> 120];
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bitplane_pixels_ <<= is_high_res_ * 8;
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pixels_[3] = palette_[
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((current_bitplanes_[0]&0x8000) >> 15) |
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((current_bitplanes_[1]&0x8000) >> 14) |
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((current_bitplanes_[2]&0x8000) >> 13) |
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((current_bitplanes_[3]&0x8000) >> 12) |
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((current_bitplanes_[4]&0x8000) >> 11)
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];
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current_bitplanes_ <<= 1;
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pixels_[3] = palette_[bitplane_pixels_ >> 120];
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bitplane_pixels_ <<= 8;
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pixels_ += 4;
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}
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@ -396,6 +372,7 @@ template <bool stop_on_cpu> Chipset::Changes Chipset::run(HalfCycles length) {
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// TODO: find out when modulos are actually applied, since
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// they're dynamically programmable.
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bitplanes_.do_end_of_line();
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previous_bitplanes_.clear();
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}
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did_fetch_ = false;
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fetch_horizontal_ = horizontal_is_last_ = false;
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@ -440,23 +417,57 @@ template <bool stop_on_cpu> Chipset::Changes Chipset::run(HalfCycles length) {
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}
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void Chipset::post_bitplanes(const BitplaneData &data) {
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// TODO: should probably store for potential delay?
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current_bitplanes_ = data;
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// Expand this
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bitplane_pixels_.set(
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previous_bitplanes_,
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data,
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odd_delay_,
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even_delay_
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);
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previous_bitplanes_ = data;
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fetch_horizontal_ &= !horizontal_is_last_;
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}
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// Convert to future pixels.
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// const int odd_offset = line_cycle_ + odd_delay_;
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// const int even_offset = line_cycle_ + odd_delay_;
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// for(int x = 0; x < 16; x++) {
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// const uint16_t mask = uint16_t(1 << x);
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// even_playfield_[x + even_offset] = uint8_t(
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// ((data[0] & mask) | ((data[2] & mask) << 1) | ((data[4] & mask) << 2)) >> x
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// );
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// odd_playfield_[x + odd_offset] = uint8_t(
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// ((data[1] & mask) | ((data[3] & mask) << 1) | ((data[5] & mask) << 2)) >> x
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// );
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// }
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namespace {
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/// Expands @c source so that b7 is the least-significant bit of the most-significant byte of the result,
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/// b6 is the least-significant bit of the next most significant byte, etc. b0 stays in place.
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constexpr uint64_t expand_byte(uint8_t source) {
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uint64_t result = source; // 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 abcd efgh
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result = (result | (result << 28)) & 0x0000'000f'0000'000f; // 0000 0000 0000 0000 0000 0000 0000 abcd 0000 0000 0000 0000 0000 0000 0000 efgh
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result = (result | (result << 14)) & 0x0003'0003'0003'0003; // 0000 0000 0000 00ab 0000 0000 0000 00cd 0000 0000 0000 00ef 0000 0000 0000 00gh
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result = (result | (result << 7)) & 0x0101'0101'0101'0101; // 0000 000a 0000 000b 0000 000c 0000 000d 0000 000e 0000 000f 0000 000g 0000 000h
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return result;
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}
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}
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void Chipset::SixteenPixels::set(const BitplaneData &previous, const BitplaneData &next, int odd_delay, int even_delay) {
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const uint16_t planes[6] = {
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uint16_t(((previous[0] << 16) | next[0]) >> even_delay),
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uint16_t(((previous[1] << 16) | next[1]) >> odd_delay),
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uint16_t(((previous[2] << 16) | next[2]) >> even_delay),
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uint16_t(((previous[3] << 16) | next[3]) >> odd_delay),
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uint16_t(((previous[4] << 16) | next[4]) >> even_delay),
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uint16_t(((previous[5] << 16) | next[5]) >> odd_delay),
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};
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(*this)[0] =
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(expand_byte(uint8_t(planes[0])) << 0) |
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(expand_byte(uint8_t(planes[1])) << 1) |
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(expand_byte(uint8_t(planes[2])) << 2) |
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(expand_byte(uint8_t(planes[3])) << 3) |
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(expand_byte(uint8_t(planes[4])) << 4) |
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(expand_byte(uint8_t(planes[5])) << 5);
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(*this)[1] =
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(expand_byte(uint8_t(planes[0] >> 8)) << 0) |
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(expand_byte(uint8_t(planes[1] >> 8)) << 1) |
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(expand_byte(uint8_t(planes[2] >> 8)) << 2) |
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(expand_byte(uint8_t(planes[3] >> 8)) << 3) |
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(expand_byte(uint8_t(planes[4] >> 8)) << 4) |
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(expand_byte(uint8_t(planes[5] >> 8)) << 5);
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}
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void Chipset::update_interrupts() {
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@ -635,6 +646,8 @@ void Chipset::perform(const CPU::MC68000::Microcycle &cycle) {
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LOG("Fetch window start set to " << std::dec << fetch_window_[0]);
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break;
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case Write(0x094):
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// TODO: something in my interpretation of ddfstart and ddfend
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// means a + 8 is needed below for high-res displays. Investigate.
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fetch_window_[1] = cycle.value16();
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LOG("Fetch window stop set to " << std::dec << fetch_window_[1]);
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break;
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@ -9,7 +9,9 @@
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#ifndef Chipset_hpp
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#define Chipset_hpp
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#include <algorithm>
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#include <array>
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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@ -167,6 +169,10 @@ class Chipset: private ClockingHint::Observer {
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(*this)[5] <<= c;
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return *this;
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}
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void clear() {
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std::fill(begin(), end(), 0);
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}
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};
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class Bitplanes: public DMADevice<6> {
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@ -185,10 +191,27 @@ class Chipset: private ClockingHint::Observer {
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} bitplanes_;
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void post_bitplanes(const BitplaneData &data);
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BitplaneData previous_bitplanes_;
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struct SixteenPixels: public std::array<uint64_t, 2> {
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void set(
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const BitplaneData &previous,
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const BitplaneData &next,
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int odd_delay,
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int even_delay);
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SixteenPixels &operator <<= (int c) {
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(*this)[1] = ((*this)[1] << c) | ((*this)[0] >> (64 - c));
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(*this)[0] <<= c;
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return *this;
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}
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int operator >> (int c) {
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assert(c >= 96);
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return int((*this)[1] >> (c - 64));
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}
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} bitplane_pixels_;
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BitplaneData current_bitplanes_, next_bitplanes_;
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// std::array<uint8_t, 912> even_playfield_;
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// std::array<uint8_t, 912> odd_playfield_;
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int odd_delay_ = 0, even_delay_ = 0;
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bool is_high_res_ = false;
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