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https://github.com/TomHarte/CLK.git
synced 2024-06-25 18:30:07 +00:00
Factor out the blitter sequencer.
This commit is contained in:
Thomas Harte
parent
a675dd8c24
commit
a6b8285d9c
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@ -15,159 +15,11 @@
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#include <vector>
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#include "../../ClockReceiver/ClockReceiver.hpp"
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#include "BlitterSequencer.hpp"
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#include "DMADevice.hpp"
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namespace Amiga {
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/*!
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Statefully provides the next access the Blitter should make.
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TODO: determine the actual logic here, rather than
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relying on tables.
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*/
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class BlitterSequencer {
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public:
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enum class Channel {
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/// Tells the caller to calculate and load a new piece of output
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/// into the output pipeline.
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///
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/// If any inputs are enabled then a one-slot output pipeline applies:
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/// output will rest in the pipeline for one write phase before being written.
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Write,
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/// Indicates that a write should occur if anything is in the pipeline, otherwise
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/// no activity should occur.
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FlushPipeline,
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/// The caller should read from channel C.
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C,
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/// The caller should read from channel B.
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B,
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/// The caller should read from channel A.
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A,
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/// Indicates an unused DMA slot.
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None
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};
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/// Sets the current control value, which indicates which
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/// channels are enabled.
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void set_control(int control) {
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control_ = control & 0xf;
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index_ = 0; // TODO: this probably isn't accurate; case caught is a change
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// of control values during a blit.
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}
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/// Indicates that blitting should conclude after this step, i.e.
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/// whatever is being fetched now is part of the final set of input data;
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/// this is safe to call following a fetch request on any channel.
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void complete() {
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next_phase_ =
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(control_ == 0x9 || control_ == 0xb || control_ == 0xd) ?
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Phase::PauseAndComplete : Phase::Complete;
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}
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/// Begins a blit operation.
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void begin() {
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phase_ = next_phase_ = Phase::Ongoing;
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index_ = loop_ = 0;
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}
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/// Provides the next channel to fetch from, or that a write is required,
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/// along with a count of complete channel iterations so far completed.
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std::pair<Channel, int> next() {
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switch(phase_) {
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default: break;
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case Phase::Complete:
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return std::make_pair(Channel::FlushPipeline, loop_);
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case Phase::PauseAndComplete:
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phase_ = Phase::Complete;
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return std::make_pair(Channel::None, loop_);
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}
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Channel next = Channel::None;
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switch(control_) {
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default: break;
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case 0: next = next_channel(pattern0); break;
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case 1: next = next_channel(pattern1); break;
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case 2: next = next_channel(pattern2); break;
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case 3: next = next_channel(pattern3); break;
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case 4: next = next_channel(pattern4); break;
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case 5: next = next_channel(pattern5); break;
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case 6: next = next_channel(pattern6); break;
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case 7: next = next_channel(pattern7); break;
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case 8: next = next_channel(pattern8); break;
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case 9: next = next_channel(pattern9); break;
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case 10: next = next_channel(patternA); break;
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case 11: next = next_channel(patternB); break;
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case 12: next = next_channel(patternC); break;
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case 13: next = next_channel(patternD); break;
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case 14: next = next_channel(patternE); break;
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case 15: next = next_channel(patternF); break;
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}
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return std::make_pair(next, loop_);
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}
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template <int channel> bool channel_enabled() {
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return control_ & (8 >> channel);
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}
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private:
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static constexpr std::array<Channel, 1> pattern0 = { Channel::None };
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static constexpr std::array<Channel, 2> pattern1 = { Channel::Write, Channel::None };
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static constexpr std::array<Channel, 2> pattern2 = { Channel::C, Channel::None };
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static constexpr std::array<Channel, 3> pattern3 = { Channel::C, Channel::Write, Channel::None };
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static constexpr std::array<Channel, 3> pattern4 = { Channel::B, Channel::None, Channel::None };
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static constexpr std::array<Channel, 3> pattern5 = { Channel::B, Channel::Write, Channel::None };
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static constexpr std::array<Channel, 3> pattern6 = { Channel::B, Channel::C, Channel::None };
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static constexpr std::array<Channel, 4> pattern7 = { Channel::B, Channel::C, Channel::Write, Channel::None };
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static constexpr std::array<Channel, 2> pattern8 = { Channel::A, Channel::None };
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static constexpr std::array<Channel, 2> pattern9 = { Channel::A, Channel::Write };
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static constexpr std::array<Channel, 2> patternA = { Channel::A, Channel::C };
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static constexpr std::array<Channel, 3> patternB = { Channel::A, Channel::C, Channel::Write };
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static constexpr std::array<Channel, 3> patternC = { Channel::A, Channel::B, Channel::None };
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static constexpr std::array<Channel, 3> patternD = { Channel::A, Channel::B, Channel::Write };
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static constexpr std::array<Channel, 3> patternE = { Channel::A, Channel::B, Channel::C };
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static constexpr std::array<Channel, 4> patternF = { Channel::A, Channel::B, Channel::C, Channel::Write };
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template <typename ArrayT> Channel next_channel(const ArrayT &list) {
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loop_ += index_ / list.size();
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index_ %= list.size();
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const Channel result = list[index_];
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++index_;
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if(index_ == list.size()) {
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phase_ = next_phase_;
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}
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return result;
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}
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// Current control flags, i.e. which channels are enabled.
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int control_ = 0;
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// Index into the pattern table for this blit.
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size_t index_ = 0;
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// Number of times the entire pattern table has been completed.
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int loop_ = 0;
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enum class Phase {
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/// Return the next thing in the pattern table and advance.
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/// If looping from the end of the pattern table to the start,
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/// set phase_ to next_phase_.
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Ongoing,
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/// Return a Channel::None and advancce to phase_ = Phase::Complete.
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PauseAndComplete,
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/// Return Channel::Write indefinitely.
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Complete
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};
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// Current sequencer pahse.
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Phase phase_ = Phase::Complete;
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// Phase to assume at the end of this iteration of the sequence table.
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Phase next_phase_ = Phase::Complete;
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};
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/*!
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If @c record_bus is @c true then all bus interactions will be recorded
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and can subsequently be retrieved. This is included for testing purposes.
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@ -176,6 +28,13 @@ template <bool record_bus = false> class Blitter: public DMADevice<4, 4> {
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public:
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using DMADevice::DMADevice;
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template <int id, int shift> void set_pointer(uint16_t value) {
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if(get_status() & 0x4000) {
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printf(">>>");
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}
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DMADevice<4, 4>::set_pointer<id, shift>(value);
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}
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// Various setters; it's assumed that address decoding is handled externally.
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//
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// In all cases where a channel is identified numerically, it's taken that
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167
Machines/Amiga/BlitterSequencer.hpp
Normal file
167
Machines/Amiga/BlitterSequencer.hpp
Normal file
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@ -0,0 +1,167 @@
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//
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// BlitterSequencer.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 19/08/2022.
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// Copyright © 2022 Thomas Harte. All rights reserved.
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//
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#ifndef BlitterSequencer_hpp
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#define BlitterSequencer_hpp
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#include <array>
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namespace Amiga {
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/*!
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Statefully provides the next access the Blitter should make.
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TODO: determine the actual logic here, rather than
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relying on tables.
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*/
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class BlitterSequencer {
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public:
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enum class Channel {
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/// Tells the caller to calculate and load a new piece of output
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/// into the output pipeline.
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///
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/// If any inputs are enabled then a one-slot output pipeline applies:
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/// output will rest in the pipeline for one write phase before being written.
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Write,
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/// Indicates that a write should occur if anything is in the pipeline, otherwise
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/// no activity should occur.
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FlushPipeline,
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/// The caller should read from channel C.
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C,
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/// The caller should read from channel B.
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B,
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/// The caller should read from channel A.
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A,
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/// Indicates an unused DMA slot.
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None
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};
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/// Sets the current control value, which indicates which
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/// channels are enabled.
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void set_control(int control) {
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control_ = control & 0xf;
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index_ = 0; // TODO: this probably isn't accurate; case caught is a change
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// of control values during a blit.
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}
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/// Indicates that blitting should conclude after this step, i.e.
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/// whatever is being fetched now is part of the final set of input data;
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/// this is safe to call following a fetch request on any channel.
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void complete() {
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next_phase_ =
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(control_ == 0x9 || control_ == 0xb || control_ == 0xd) ?
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Phase::PauseAndComplete : Phase::Complete;
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}
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/// Begins a blit operation.
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void begin() {
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phase_ = next_phase_ = Phase::Ongoing;
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index_ = loop_ = 0;
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}
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/// Provides the next channel to fetch from, or that a write is required,
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/// along with a count of complete channel iterations so far completed.
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std::pair<Channel, int> next() {
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switch(phase_) {
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default: break;
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case Phase::Complete:
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return std::make_pair(Channel::FlushPipeline, loop_);
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case Phase::PauseAndComplete:
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phase_ = Phase::Complete;
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return std::make_pair(Channel::None, loop_);
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}
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Channel next = Channel::None;
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switch(control_) {
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default: break;
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case 0: next = next_channel(pattern0); break;
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case 1: next = next_channel(pattern1); break;
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case 2: next = next_channel(pattern2); break;
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case 3: next = next_channel(pattern3); break;
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case 4: next = next_channel(pattern4); break;
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case 5: next = next_channel(pattern5); break;
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case 6: next = next_channel(pattern6); break;
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case 7: next = next_channel(pattern7); break;
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case 8: next = next_channel(pattern8); break;
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case 9: next = next_channel(pattern9); break;
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case 10: next = next_channel(patternA); break;
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case 11: next = next_channel(patternB); break;
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case 12: next = next_channel(patternC); break;
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case 13: next = next_channel(patternD); break;
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case 14: next = next_channel(patternE); break;
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case 15: next = next_channel(patternF); break;
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}
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return std::make_pair(next, loop_);
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}
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template <int channel> bool channel_enabled() {
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return control_ & (8 >> channel);
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}
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private:
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static constexpr std::array<Channel, 1> pattern0 = { Channel::None };
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static constexpr std::array<Channel, 2> pattern1 = { Channel::Write, Channel::None };
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static constexpr std::array<Channel, 2> pattern2 = { Channel::C, Channel::None };
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static constexpr std::array<Channel, 3> pattern3 = { Channel::C, Channel::Write, Channel::None };
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static constexpr std::array<Channel, 3> pattern4 = { Channel::B, Channel::None, Channel::None };
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static constexpr std::array<Channel, 3> pattern5 = { Channel::B, Channel::Write, Channel::None };
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static constexpr std::array<Channel, 3> pattern6 = { Channel::B, Channel::C, Channel::None };
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static constexpr std::array<Channel, 4> pattern7 = { Channel::B, Channel::C, Channel::Write, Channel::None };
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static constexpr std::array<Channel, 2> pattern8 = { Channel::A, Channel::None };
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static constexpr std::array<Channel, 2> pattern9 = { Channel::A, Channel::Write };
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static constexpr std::array<Channel, 2> patternA = { Channel::A, Channel::C };
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static constexpr std::array<Channel, 3> patternB = { Channel::A, Channel::C, Channel::Write };
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static constexpr std::array<Channel, 3> patternC = { Channel::A, Channel::B, Channel::None };
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static constexpr std::array<Channel, 3> patternD = { Channel::A, Channel::B, Channel::Write };
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static constexpr std::array<Channel, 3> patternE = { Channel::A, Channel::B, Channel::C };
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static constexpr std::array<Channel, 4> patternF = { Channel::A, Channel::B, Channel::C, Channel::Write };
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template <typename ArrayT> Channel next_channel(const ArrayT &list) {
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loop_ += index_ / list.size();
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index_ %= list.size();
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const Channel result = list[index_];
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++index_;
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if(index_ == list.size()) {
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phase_ = next_phase_;
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}
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return result;
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}
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// Current control flags, i.e. which channels are enabled.
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int control_ = 0;
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// Index into the pattern table for this blit.
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size_t index_ = 0;
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// Number of times the entire pattern table has been completed.
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int loop_ = 0;
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enum class Phase {
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/// Return the next thing in the pattern table and advance.
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/// If looping from the end of the pattern table to the start,
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/// set phase_ to next_phase_.
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Ongoing,
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/// Return a Channel::None and advancce to phase_ = Phase::Complete.
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PauseAndComplete,
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/// Return Channel::Write indefinitely.
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Complete
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};
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// Current sequencer pahse.
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Phase phase_ = Phase::Complete;
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// Phase to assume at the end of this iteration of the sequence table.
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Phase next_phase_ = Phase::Complete;
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};
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}
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#endif /* BlitterSequencer_hpp */
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@ -1359,6 +1359,7 @@
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4B4A762F1DB1A3FA007AAE2E /* AY38910.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = AY38910.hpp; sourceTree = "<group>"; };
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4B4B1A3A200198C900A0F866 /* KonamiSCC.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = KonamiSCC.cpp; sourceTree = "<group>"; };
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4B4B1A3B200198C900A0F866 /* KonamiSCC.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = KonamiSCC.hpp; sourceTree = "<group>"; };
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4B4C81C228B0288B00F84AE9 /* BlitterSequencer.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = BlitterSequencer.hpp; sourceTree = "<group>"; };
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4B4DC81F1D2C2425003C5BF8 /* Vic20.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = Vic20.cpp; sourceTree = "<group>"; };
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4B4DC8201D2C2425003C5BF8 /* Vic20.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = Vic20.hpp; sourceTree = "<group>"; };
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4B4DC8271D2C2470003C5BF8 /* C1540.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = C1540.hpp; sourceTree = "<group>"; };
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@ -4440,6 +4441,7 @@
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4B2130E1273A7A0A008A77B4 /* Audio.hpp */,
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4B7C681D2751A104001671EC /* Bitplanes.hpp */,
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4B9EC0E026AA260C0060A31F /* Blitter.hpp */,
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4B4C81C228B0288B00F84AE9 /* BlitterSequencer.hpp */,
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4B9EC0E526AA4A660060A31F /* Chipset.hpp */,
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4BC6236B26F4224300F83DFE /* Copper.hpp */,
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4BC6236A26F178DA00F83DFE /* DMADevice.hpp */,
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