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Factors out DMADevice, which is now a parent of Blitter.

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This commit is contained in:
Thomas Harte 2021-09-14 20:51:32 -04:00
parent e47eab1d40
commit add11db369
6 changed files with 57 additions and 41 deletions
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4
Machines/Amiga/Blitter.cpp
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@ -14,8 +14,6 @@
using namespace Amiga;
Blitter::Blitter(uint16_t *ram, size_t size) : ram_(ram), ram_mask_(uint32_t(size-1)) {}
void Blitter::set_control(int index, uint16_t value) {
LOG("Set control " << index << " to " << PADHEX(4) << value);
}
@ -61,6 +59,6 @@ uint16_t Blitter::get_status() {
}
bool Blitter::advance() {
ram_[addresses_[3] & ram_mask_] = 0xffff;
ram_[(pointer_[3] >> 1) & ram_mask_] = 0xffff;
return false;
}

13
Machines/Amiga/Blitter.hpp
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@ -13,12 +13,13 @@
#include <cstdint>
#include "../../ClockReceiver/ClockReceiver.hpp"
#include "DMADevice.hpp"
namespace Amiga {
class Blitter {
class Blitter: public DMADevice<4> {
public:
Blitter(uint16_t *ram, size_t size);
using DMADevice::DMADevice;
// Various setters; it's assumed that address decoding is handled externally.
//
@ -28,10 +29,6 @@ class Blitter {
void set_first_word_mask(uint16_t value);
void set_last_word_mask(uint16_t value);
template <int id, int shift> void set_pointer(uint16_t value) {
addresses_[id] = (addresses_[id] & (0xffff'0000 >> shift)) | uint32_t(value << shift);
}
void set_size(uint16_t value);
void set_minterms(uint16_t value);
void set_vertical_size(uint16_t value);
@ -44,10 +41,6 @@ class Blitter {
bool advance();
private:
uint16_t *const ram_;
const uint32_t ram_mask_;
uint32_t addresses_[4];
uint8_t minterms_;
int width_ = 0, height_ = 0;
};

2
Machines/Amiga/Chipset.cpp
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@ -33,7 +33,7 @@ template <DMAFlag... Flags> struct DMAMask: Mask<DMAFlag, Flags...> {};
}
Chipset::Chipset(uint16_t *ram, size_t size) :
blitter_(ram, size),
blitter_(*this, ram, size),
bitplanes_(*this, ram, size),
copper_(*this, ram, size),
disk_(*this, ram, size),

29
Machines/Amiga/Chipset.hpp
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@ -15,6 +15,7 @@
#include "../../Processors/68000/68000.hpp"
#include "../../Outputs/CRT/CRT.hpp"
#include "DMADevice.hpp"
#include "Blitter.hpp"
namespace Amiga {
@ -94,33 +95,7 @@ class Chipset {
Outputs::Display::DisplayType get_display_type() const;
private:
// MARK: - Common base for DMA components.
class DMADeviceBase {
public:
DMADeviceBase(Chipset &chipset, uint16_t *ram, size_t size) : chipset_(chipset), ram_(ram), ram_mask_(uint32_t(size - 1)) {}
protected:
Chipset &chipset_;
uint16_t *ram_ = nullptr;
uint32_t ram_mask_ = 0;
};
friend DMADeviceBase;
template <size_t num_addresses> class DMADevice: public DMADeviceBase {
public:
using DMADeviceBase::DMADeviceBase;
/// Writes the word @c value to the address register @c id, shifting it by @c shift (0 or 16) first.
template <int id, int shift> void set_pointer(uint16_t value) {
static_assert(id < num_addresses);
static_assert(shift == 0 || shift == 16);
pointer_[id] = (pointer_[id] & (0xffff'0000 >> shift)) | uint32_t(value << shift);
}
protected:
std::array<uint32_t, num_addresses> pointer_{};
};
friend class DMADeviceBase;
// MARK: - Interrupts.

48
Machines/Amiga/DMADevice.hpp Normal file
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@ -0,0 +1,48 @@
//
// DMADevice.hpp
// Clock Signal
//
// Created by Thomas Harte on 14/09/2021.
// Copyright © 2021 Thomas Harte. All rights reserved.
//
#ifndef DMADevice_hpp
#define DMADevice_hpp
#include <array>
#include <cstddef>
#include <cstdint>
namespace Amiga {
class Chipset;
class DMADeviceBase {
public:
DMADeviceBase(Chipset &chipset, uint16_t *ram, size_t size) :
chipset_(chipset), ram_(ram), ram_mask_(uint32_t((size - 1) >> 1)) {}
protected:
Chipset &chipset_;
uint16_t *const ram_ = nullptr;
const uint32_t ram_mask_ = 0;
};
template <size_t num_addresses> class DMADevice: public DMADeviceBase {
public:
using DMADeviceBase::DMADeviceBase;
/// Writes the word @c value to the address register @c id, shifting it by @c shift (0 or 16) first.
template <int id, int shift> void set_pointer(uint16_t value) {
static_assert(id < num_addresses);
static_assert(shift == 0 || shift == 16);
pointer_[id] = (pointer_[id] & (0xffff'0000 >> shift)) | uint32_t(value << shift);
}
protected:
std::array<uint32_t, num_addresses> pointer_{};
};
}
#endif /* DMADevice_hpp */

2
OSBindings/Mac/Clock Signal.xcodeproj/project.pbxproj
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@ -1961,6 +1961,7 @@
4BC57CD82436A62900FBC404 /* State.cpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.cpp; path = State.cpp; sourceTree = "<group>"; };
4BC5C3DF22C994CC00795658 /* 68000MoveTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = 68000MoveTests.mm; sourceTree = "<group>"; };
4BC5FC2F20CDDDEE00410AA0 /* Base */ = {isa = PBXFileReference; lastKnownFileType = file.xib; name = Base; path = "Clock Signal/Base.lproj/AppleIIOptions.xib"; sourceTree = SOURCE_ROOT; };
4BC6236A26F178DA00F83DFE /* DMADevice.hpp */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.cpp.h; path = DMADevice.hpp; sourceTree = "<group>"; };
4BC751B11D157E61006C31D9 /* 6522Tests.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = 6522Tests.swift; sourceTree = "<group>"; };
4BC76E671C98E31700E6EF73 /* FIRFilter.cpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.cpp; path = FIRFilter.cpp; sourceTree = "<group>"; };
4BC76E681C98E31700E6EF73 /* FIRFilter.hpp */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.h; path = FIRFilter.hpp; sourceTree = "<group>"; };
@ -4284,6 +4285,7 @@
4BC080D726A25ADA00D03FD8 /* Amiga.hpp */,
4B9EC0E026AA260C0060A31F /* Blitter.hpp */,
4B9EC0E526AA4A660060A31F /* Chipset.hpp */,
4BC6236A26F178DA00F83DFE /* DMADevice.hpp */,
4B9EC0E926B384080060A31F /* Keyboard.hpp */,
);
path = Amiga;