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Merge pull request #1156 from TomHarte/IIgsMouseMystery

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Without rhythm or rhyme, fix IIgs GSOS mouse movement.
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Thomas Harte 2023-08-20 16:19:04 -04:00 committed by GitHub
commit b5dc84c431
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GPG Key ID: 4AEE18F83AFDEB23
4 changed files with 32 additions and 17 deletions
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32
Machines/Apple/ADB/Mouse.cpp
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@ -15,24 +15,36 @@ using namespace Apple::ADB;
Mouse::Mouse(Bus &bus) : ReactiveDevice(bus, 3) {}
void Mouse::perform_command(const Command &command) {
if(command.type == Command::Type::Talk && command.reg == 0) {
// Read current deltas and buttons, thread safely.
auto delta_x = delta_x_.exchange(0);
auto delta_y = delta_y_.exchange(0);
const int buttons = button_flags_;
// This was picked empirically based on experimentation with the IIgs.
// Possible TODO: consider whether this is appropriate for other machines.
static constexpr int16_t max_delta = 30;
// Clamp deltas.
delta_x = std::clamp(delta_x, int16_t(-128), int16_t(127));
delta_y = std::clamp(delta_y, int16_t(-128), int16_t(127));
if(command.type == Command::Type::Talk && command.reg == 0) {
// Read and clamp current deltas and buttons.
//
// There's some small chance of creating negative feedback here — taking too much off delta_x_ or delta_y_
// due to a change in the underlying value between the load and the arithmetic. But if that occurs it means
// the user moved the mouse again in the interim, so it'll just play out as very slight latency.
auto delta_x = delta_x_.load(std::memory_order::memory_order_relaxed);
auto delta_y = delta_y_.load(std::memory_order::memory_order_relaxed);
if(abs(delta_x) > max_delta || abs(delta_y) > max_delta) {
int max = std::max(abs(delta_x), abs(delta_y));
delta_x = delta_x * max_delta / max;
delta_y = delta_y * max_delta / max;
}
const int buttons = button_flags_.load(std::memory_order::memory_order_relaxed);
delta_x_ -= delta_x;
delta_y_ -= delta_y;
// Figure out what that would look like, and don't respond if there's
// no change to report.
// no change or deltas to report.
const uint16_t reg0 =
((buttons & 1) ? 0x0000 : 0x8000) |
((buttons & 2) ? 0x0000 : 0x0080) |
uint16_t(delta_x & 0x7f) |
uint16_t((delta_y & 0x7f) << 8);
if(reg0 == last_posted_reg0_) return;
if(!(reg0 & 0x7f7f) && (reg0 & 0x8080) == (last_posted_reg0_ & 0x8080)) return;
// Post change.
last_posted_reg0_ = reg0;

13
Machines/Apple/AppleIIgs/ADB.cpp
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@ -76,11 +76,15 @@ uint8_t GLU::get_mouse_data() {
// b5–b0: mouse delta.
const uint8_t result = registers_[visible_mouse_register_];
if(visible_mouse_register_ == 2) {
++visible_mouse_register_;
} else {
if(visible_mouse_register_ == 3) {
status_ &= ~uint8_t(CPUFlags::MouseDataFull);
}
// Spelt out at tedious length because Clang has trust issues.
static constexpr int first_register = 2;
static constexpr int second_register = 3;
static constexpr int flip_mask = first_register ^ second_register;
visible_mouse_register_ ^= flip_mask;
return result;
}
@ -116,7 +120,7 @@ uint8_t GLU::get_status() {
// b2: 1 = keyboard data interrupt is enabled.
// b1: 1 = mouse x-data is available; 0 = y.
// b0: 1 = command register is full (set when command is written); 0 = empty (cleared when data is read).
return status_ | ((visible_mouse_register_ == 2) ? uint8_t(CPUFlags::MouseXIsAvailable) : 0);
return status_ | ((visible_mouse_register_ == 2) ? 0 : uint8_t(CPUFlags::MouseXIsAvailable));
}
void GLU::set_status(uint8_t status) {
@ -223,7 +227,6 @@ void GLU::set_port_output(int port, uint8_t value) {
case 3:
status_ |= uint8_t(CPUFlags::MouseDataFull);
visible_mouse_register_ = 2;
printf("Mouse: %d <- %02x\n", register_address_, register_latch_);
break;
case 7: status_ |= uint8_t(CPUFlags::CommandDataIsValid); break;
}

2
Machines/Apple/AppleIIgs/AppleIIgs.cpp
View File

@ -752,7 +752,7 @@ class ConcreteMachine:
is_1Mhz = true;
break;
case Read(0xc045):
// MMDELTAX byte.
// MMDELTAY byte.
*value = 0;
is_1Mhz = true;
break;

2
OSBindings/Mac/Clock Signal.xcodeproj/xcshareddata/xcschemes/Clock Signal.xcscheme
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@ -1,7 +1,7 @@
<?xml version="1.0" encoding="UTF-8"?>
<Scheme
LastUpgradeVersion = "1400"
version = "1.3">
version = "1.8">
<BuildAction
parallelizeBuildables = "YES"
buildImplicitDependencies = "YES">