mirror of
https://github.com/TomHarte/CLK.git
synced 2024-11-21 21:33:54 +00:00
Move sprites into their own source file.
This commit is contained in:
Thomas Harte
parent
4b21549ff4
commit
1c0962e53c
@ -43,27 +43,12 @@ constexpr uint64_t expand_bitplane_byte(uint8_t source) {
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return result;
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}
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/// Expands @c source from b15 ... b0 to 000b15 ... 000b0.
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constexpr uint64_t expand_sprite_word(uint16_t source) {
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uint64_t result = source;
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result = (result | (result << 24)) & 0x0000'00ff'0000'00ff;
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result = (result | (result << 12)) & 0x000f'000f'000f'000f;
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result = (result | (result << 6)) & 0x0303'0303'0303'0303;
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result = (result | (result << 3)) & 0x1111'1111'1111'1111;
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return result;
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}
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// A very small selection of test cases.
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static_assert(expand_bitplane_byte(0xff) == 0x01'01'01'01'01'01'01'01);
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static_assert(expand_bitplane_byte(0x55) == 0x00'01'00'01'00'01'00'01);
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static_assert(expand_bitplane_byte(0xaa) == 0x01'00'01'00'01'00'01'00);
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static_assert(expand_bitplane_byte(0x00) == 0x00'00'00'00'00'00'00'00);
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static_assert(expand_sprite_word(0xffff) == 0x11'11'11'11'11'11'11'11);
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static_assert(expand_sprite_word(0x5555) == 0x01'01'01'01'01'01'01'01);
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static_assert(expand_sprite_word(0xaaaa) == 0x10'10'10'10'10'10'10'10);
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static_assert(expand_sprite_word(0x0000) == 0x00'00'00'00'00'00'00'00);
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}
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#define DMA_CONSTRUCT *this, reinterpret_cast<uint16_t *>(map.chip_ram.data()), map.chip_ram.size() >> 1
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@ -1102,86 +1087,6 @@ void Chipset::Bitplanes::set_control(uint16_t control) {
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}
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}
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// MARK: - Sprites.
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void Chipset::Sprite::set_start_position(uint16_t value) {
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v_start_ = (v_start_ & 0xff00) | (value >> 8);
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h_start = uint16_t((h_start & 0x0001) | ((value & 0xff) << 1));
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}
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void Chipset::Sprite::set_stop_and_control(uint16_t value) {
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h_start = uint16_t((h_start & 0x01fe) | (value & 0x01));
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v_stop_ = uint16_t((value >> 8) | ((value & 0x02) << 7));
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v_start_ = uint16_t((v_start_ & 0x00ff) | ((value & 0x04) << 6));
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attached = value & 0x80;
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// Disarm the sprite, but expect graphics next from DMA.
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visible = false;
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dma_state_ = DMAState::FetchImage;
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}
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void Chipset::Sprite::set_image_data(int slot, uint16_t value) {
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data[slot] = value;
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visible |= slot == 0;
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}
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void Chipset::Sprite::advance_line(int y, bool is_end_of_blank) {
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if(dma_state_ == DMAState::FetchImage && y == v_start_) {
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visible = true;
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}
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if(is_end_of_blank || y == v_stop_) {
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dma_state_ = DMAState::FetchControl;
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}
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}
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bool Chipset::Sprite::advance_dma(int offset) {
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if(!visible) return false;
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// Fetch another word.
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const uint16_t next_word = ram_[pointer_[0] & ram_mask_];
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++pointer_[0];
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// Put the fetched word somewhere appropriate and update the DMA state.
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switch(dma_state_) {
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// i.e. stopped.
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default: return false;
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case DMAState::FetchControl:
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if(offset) {
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set_stop_and_control(next_word);
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} else {
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set_start_position(next_word);
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}
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return true;
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case DMAState::FetchImage:
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set_image_data(1 - bool(offset), next_word);
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return true;
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}
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return false;
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}
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template <int sprite> void Chipset::TwoSpriteShifter::load(
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uint16_t lsb,
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uint16_t msb,
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int delay) {
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constexpr int sprite_shift = sprite << 1;
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const int delay_shift = delay << 2;
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// Clear out any current sprite pixels; this is a reload.
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data_ &= 0xcccc'cccc'cccc'ccccull >> (sprite_shift + delay_shift);
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// Map LSB and MSB up to 64-bits and load into the shifter.
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const uint64_t new_data =
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(
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expand_sprite_word(lsb) |
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(expand_sprite_word(msb) << 1)
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) << sprite_shift;
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data_ |= new_data >> delay_shift;
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overflow_ |= uint8_t((new_data << 8) >> delay_shift);
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}
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// MARK: - CRT connection.
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void Chipset::set_scan_target(Outputs::Display::ScanTarget *scan_target) {
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@ -33,6 +33,7 @@
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#include "Flags.hpp"
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#include "Keyboard.hpp"
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#include "MemoryMap.hpp"
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#include "Sprites.hpp"
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namespace Amiga {
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@ -142,60 +143,8 @@ class Chipset: private ClockingHint::Observer {
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// MARK: - Sprites.
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class Sprite: public DMADevice<1> {
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public:
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using DMADevice::DMADevice;
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void set_start_position(uint16_t value);
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void set_stop_and_control(uint16_t value);
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void set_image_data(int slot, uint16_t value);
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void advance_line(int y, bool is_end_of_blank);
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bool advance_dma(int offset);
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uint16_t data[2]{};
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bool attached = false;
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bool visible = false;
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uint16_t h_start = 0;
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private:
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uint16_t v_start_ = 0, v_stop_ = 0;
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enum class DMAState {
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FetchControl,
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FetchImage
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} dma_state_ = DMAState::FetchControl;
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} sprites_[8];
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class TwoSpriteShifter {
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public:
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/// Installs new pixel data for @c sprite (either 0 or 1),
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/// with @c delay being either 0 or 1 to indicate whether
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/// output should begin now or in one pixel's time.
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template <int sprite> void load(
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uint16_t lsb,
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uint16_t msb,
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int delay);
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/// Shifts two pixels.
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void shift() {
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data_ <<= 8;
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data_ |= overflow_;
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overflow_ = 0;
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}
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/// @returns The next two pixels to output, formulated as
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/// abcd efgh where ab and ef are two pixels of the first sprite
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/// and cd and gh are two pixels of the second. In each case the
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/// more significant two are output first.
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uint8_t get() {
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return uint8_t(data_ >> 56);
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}
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private:
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uint64_t data_;
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uint8_t overflow_;
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} sprite_shifters_[4];
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Sprite sprites_[8];
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TwoSpriteShifter sprite_shifters_[4];
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// MARK: - Raster position and state.
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114
Machines/Amiga/Sprites.cpp
Normal file
114
Machines/Amiga/Sprites.cpp
Normal file
@ -0,0 +1,114 @@
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//
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// Sprites.cpp
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// Clock Signal
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//
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// Created by Thomas Harte on 26/11/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#include "Sprites.hpp"
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using namespace Amiga;
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namespace {
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/// Expands @c source from b15 ... b0 to 000b15 ... 000b0.
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constexpr uint64_t expand_sprite_word(uint16_t source) {
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uint64_t result = source;
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result = (result | (result << 24)) & 0x0000'00ff'0000'00ff;
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result = (result | (result << 12)) & 0x000f'000f'000f'000f;
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result = (result | (result << 6)) & 0x0303'0303'0303'0303;
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result = (result | (result << 3)) & 0x1111'1111'1111'1111;
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return result;
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}
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// A very small selection of test cases.
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static_assert(expand_sprite_word(0xffff) == 0x11'11'11'11'11'11'11'11);
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static_assert(expand_sprite_word(0x5555) == 0x01'01'01'01'01'01'01'01);
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static_assert(expand_sprite_word(0xaaaa) == 0x10'10'10'10'10'10'10'10);
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static_assert(expand_sprite_word(0x0000) == 0x00'00'00'00'00'00'00'00);
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}
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// MARK: - Sprites.
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void Sprite::set_start_position(uint16_t value) {
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v_start_ = (v_start_ & 0xff00) | (value >> 8);
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h_start = uint16_t((h_start & 0x0001) | ((value & 0xff) << 1));
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}
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void Sprite::set_stop_and_control(uint16_t value) {
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h_start = uint16_t((h_start & 0x01fe) | (value & 0x01));
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v_stop_ = uint16_t((value >> 8) | ((value & 0x02) << 7));
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v_start_ = uint16_t((v_start_ & 0x00ff) | ((value & 0x04) << 6));
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attached = value & 0x80;
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// Disarm the sprite, but expect graphics next from DMA.
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visible = false;
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dma_state_ = DMAState::FetchImage;
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}
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void Sprite::set_image_data(int slot, uint16_t value) {
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data[slot] = value;
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visible |= slot == 0;
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}
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void Sprite::advance_line(int y, bool is_end_of_blank) {
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if(dma_state_ == DMAState::FetchImage && y == v_start_) {
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visible = true;
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}
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if(is_end_of_blank || y == v_stop_) {
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dma_state_ = DMAState::FetchControl;
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}
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}
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bool Sprite::advance_dma(int offset) {
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if(!visible) return false;
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// Fetch another word.
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const uint16_t next_word = ram_[pointer_[0] & ram_mask_];
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++pointer_[0];
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// Put the fetched word somewhere appropriate and update the DMA state.
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switch(dma_state_) {
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// i.e. stopped.
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default: return false;
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case DMAState::FetchControl:
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if(offset) {
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set_stop_and_control(next_word);
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} else {
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set_start_position(next_word);
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}
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return true;
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case DMAState::FetchImage:
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set_image_data(1 - bool(offset), next_word);
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return true;
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}
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return false;
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}
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template <int sprite> void TwoSpriteShifter::load(
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uint16_t lsb,
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uint16_t msb,
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int delay) {
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constexpr int sprite_shift = sprite << 1;
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const int delay_shift = delay << 2;
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// Clear out any current sprite pixels; this is a reload.
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data_ &= 0xcccc'cccc'cccc'ccccull >> (sprite_shift + delay_shift);
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// Map LSB and MSB up to 64-bits and load into the shifter.
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const uint64_t new_data =
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(
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expand_sprite_word(lsb) |
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(expand_sprite_word(msb) << 1)
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) << sprite_shift;
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data_ |= new_data >> delay_shift;
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overflow_ |= uint8_t((new_data << 8) >> delay_shift);
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}
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template void TwoSpriteShifter::load<0>(uint16_t, uint16_t, int);
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template void TwoSpriteShifter::load<1>(uint16_t, uint16_t, int);
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76
Machines/Amiga/Sprites.hpp
Normal file
76
Machines/Amiga/Sprites.hpp
Normal file
@ -0,0 +1,76 @@
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//
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// Sprites.hpp
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// Clock Signal
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//
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// Created by Thomas Harte on 26/11/2021.
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// Copyright © 2021 Thomas Harte. All rights reserved.
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//
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#ifndef Sprites_hpp
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#define Sprites_hpp
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#include <cstdint>
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#include "DMADevice.hpp"
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namespace Amiga {
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class Sprite: public DMADevice<1> {
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public:
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using DMADevice::DMADevice;
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void set_start_position(uint16_t value);
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void set_stop_and_control(uint16_t value);
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void set_image_data(int slot, uint16_t value);
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void advance_line(int y, bool is_end_of_blank);
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bool advance_dma(int offset);
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uint16_t data[2]{};
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bool attached = false;
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bool visible = false;
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uint16_t h_start = 0;
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private:
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uint16_t v_start_ = 0, v_stop_ = 0;
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enum class DMAState {
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FetchControl,
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FetchImage
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} dma_state_ = DMAState::FetchControl;
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};
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class TwoSpriteShifter {
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public:
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/// Installs new pixel data for @c sprite (either 0 or 1),
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/// with @c delay being either 0 or 1 to indicate whether
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/// output should begin now or in one pixel's time.
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template <int sprite> void load(
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uint16_t lsb,
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uint16_t msb,
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int delay);
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/// Shifts two pixels.
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void shift() {
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data_ <<= 8;
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data_ |= overflow_;
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overflow_ = 0;
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}
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/// @returns The next two pixels to output, formulated as
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/// abcd efgh where ab and ef are two pixels of the first sprite
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/// and cd and gh are two pixels of the second. In each case the
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/// more significant two are output first.
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uint8_t get() {
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return uint8_t(data_ >> 56);
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}
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private:
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uint64_t data_;
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uint8_t overflow_;
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};
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}
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#endif /* Sprites_hpp */
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@ -433,6 +433,8 @@
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|
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||||
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|
||||
4B7C681627517A59001671EC /* Sprites.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7C681427517A59001671EC /* Sprites.cpp */; };
|
||||
4B7C681727517A59001671EC /* Sprites.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7C681427517A59001671EC /* Sprites.cpp */; };
|
||||
4B7F188E2154825E00388727 /* MasterSystem.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7F188C2154825D00388727 /* MasterSystem.cpp */; };
|
||||
4B7F188F2154825E00388727 /* MasterSystem.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7F188C2154825D00388727 /* MasterSystem.cpp */; };
|
||||
4B7F1897215486A200388727 /* StaticAnalyser.cpp in Sources */ = {isa = PBXBuildFile; fileRef = 4B7F1896215486A100388727 /* StaticAnalyser.cpp */; };
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||||
@ -1425,6 +1427,8 @@
|
||||
4B7BA03823CEB8D200B98D9E /* DiskController.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = DiskController.hpp; sourceTree = "<group>"; };
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||||
4B7BA03E23D55E7900B98D9E /* CRC.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = CRC.hpp; sourceTree = "<group>"; };
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||||
4B7BA03F23D55E7900B98D9E /* LFSR.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = LFSR.hpp; sourceTree = "<group>"; };
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||||
4B7C681427517A59001671EC /* Sprites.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = Sprites.cpp; sourceTree = "<group>"; };
|
||||
4B7C681527517A59001671EC /* Sprites.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = Sprites.hpp; sourceTree = "<group>"; };
|
||||
4B7F188C2154825D00388727 /* MasterSystem.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = MasterSystem.cpp; sourceTree = "<group>"; };
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||||
4B7F188D2154825D00388727 /* MasterSystem.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = MasterSystem.hpp; sourceTree = "<group>"; };
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||||
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||||
@ -4306,6 +4310,7 @@
|
||||
4BC6236C26F4235400F83DFE /* Copper.cpp */,
|
||||
4B1A1B1C27320FBB00119335 /* Disk.cpp */,
|
||||
4B9EC0E826B384080060A31F /* Keyboard.cpp */,
|
||||
4B7C681427517A59001671EC /* Sprites.cpp */,
|
||||
4BC080D726A25ADA00D03FD8 /* Amiga.hpp */,
|
||||
4B2130E1273A7A0A008A77B4 /* Audio.hpp */,
|
||||
4B9EC0E026AA260C0060A31F /* Blitter.hpp */,
|
||||
@ -4316,6 +4321,7 @@
|
||||
4B9EC0E926B384080060A31F /* Keyboard.hpp */,
|
||||
4BD1552E270B14AC00410C6E /* MemoryMap.hpp */,
|
||||
4BC6237026F94A5B00F83DFE /* Minterms.hpp */,
|
||||
4B7C681527517A59001671EC /* Sprites.hpp */,
|
||||
);
|
||||
path = Amiga;
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||||
sourceTree = "<group>";
|
||||
@ -5344,6 +5350,7 @@
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||||
4B2E86BF25D74F160024F1E9 /* Mouse.cpp in Sources */,
|
||||
4B6ED2F1208E2F8A0047B343 /* WOZ.cpp in Sources */,
|
||||
4B5D5C9825F56FC7001B4623 /* Spectrum.cpp in Sources */,
|
||||
4B7C681727517A59001671EC /* Sprites.cpp in Sources */,
|
||||
4B2E86D025D8D8C70024F1E9 /* Keyboard.cpp in Sources */,
|
||||
4B89452F201967B4007DE474 /* StaticAnalyser.cpp in Sources */,
|
||||
4B894531201967B4007DE474 /* StaticAnalyser.cpp in Sources */,
|
||||
@ -5718,6 +5725,7 @@
|
||||
4B894528201967B4007DE474 /* Disk.cpp in Sources */,
|
||||
4B2E86CF25D8D8C70024F1E9 /* Keyboard.cpp in Sources */,
|
||||
4BBB70A4202011C2002FE009 /* MultiMediaTarget.cpp in Sources */,
|
||||
4B7C681627517A59001671EC /* Sprites.cpp in Sources */,
|
||||
4B0ACC02237756ED008902D0 /* Line.cpp in Sources */,
|
||||
4B89453A201967B4007DE474 /* StaticAnalyser.cpp in Sources */,
|
||||
4BB697CB1D4B6D3E00248BDF /* TimedEventLoop.cpp in Sources */,
|
||||
|
||||
Loading…
Reference in New Issue
Block a user