CLK/OSBindings/Mac/Clock SignalTests/AmigaBlitterTests.mm

//
//  AmigaBlitterTests.m
//  Clock SignalTests
//
//  Created by Thomas Harte on 25/09/2021.
//  Copyright © 2021 Thomas Harte. All rights reserved.
//

#import <XCTest/XCTest.h>

#include "Blitter.hpp"

#include <vector>

namespace Amiga {
/// An empty stub to satisfy Amiga::Blitter's inheritance from Amiga::DMADevice;
struct Chipset {};
};

@interface AmigaBlitterTests: XCTestCase
@end

@implementation AmigaBlitterTests

- (void)testWorkbench13BootLogo {
	uint16_t ram[512 * 1024]{};
	Amiga::Chipset nonChipset;
	Amiga::Blitter blitter(nonChipset, ram, 256 * 1024);

	NSURL *const traceURL = [[NSBundle bundleForClass:[self class]] URLForResource:@"workbench13 boot logo" withExtension:@"json"];
	NSData *const traceData = [NSData dataWithContentsOfURL:traceURL];
	NSArray *const trace = [NSJSONSerialization JSONObjectWithData:traceData options:0 error:nil];

	// Step 1 in developing my version of the Blitter is to make sure that I understand
	// the logic; as a result the first implementation is going to be a magical thing that
	// completes all Blits in a single cycle.
	//
	// Therefore I've had to bodge my way around the trace's record of reads and writes by
	// accumulating all writes into a blob and checking them en massse at the end of a blit
	// (as detected by any register work in between memory accesses, since Kickstart 1.3
	// doesn't do anything off-book).
	enum class State {
		AwaitingWrites,
		LoggingWrites
	} state = State::AwaitingWrites;

	std::vector<std::pair<uint32_t, uint16_t>> writes;

	for(NSArray *const event in trace) {
		NSString *const type = event[0];
		const NSInteger param1 = [event[1] integerValue];

		if([type isEqualToString:@"bltcon0"]) {
			blitter.set_control(0, param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltcon1"]) {
			blitter.set_control(1, param1);
			state = State::AwaitingWrites;
			continue;
		}

		if([type isEqualToString:@"bltsize"]) {
			blitter.set_size(param1);
			state = State::AwaitingWrites;
			continue;
		}

		if([type isEqualToString:@"bltafwm"]) {
			blitter.set_first_word_mask(param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltalwm"]) {
			blitter.set_last_word_mask(param1);
			state = State::AwaitingWrites;
			continue;
		}

		if([type isEqualToString:@"bltadat"]) {
			blitter.set_data(0, param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltbdat"]) {
			blitter.set_data(1, param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltcdat"]) {
			blitter.set_data(2, param1);
			state = State::AwaitingWrites;
			continue;
		}

		if([type isEqualToString:@"bltaptl"]) {
			blitter.set_pointer<0, 0>(param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltbptl"]) {
			blitter.set_pointer<1, 0>(param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltcptl"]) {
			blitter.set_pointer<2, 0>(param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltdptl"]) {
			blitter.set_pointer<3, 0>(param1);
			state = State::AwaitingWrites;
			continue;
		}

		if([type isEqualToString:@"bltapth"]) {
			blitter.set_pointer<0, 16>(param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltbpth"]) {
			blitter.set_pointer<1, 16>(param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltcpth"]) {
			blitter.set_pointer<2, 16>(param1);
			state = State::AwaitingWrites;
			continue;
		}
		if([type isEqualToString:@"bltdpth"]) {
			blitter.set_pointer<3, 16>(param1);
			state = State::AwaitingWrites;
			continue;
		}

		// Hackaround for testing my magical all-at-once Blitter is here.
		if(state == State::AwaitingWrites) {
			for(const auto &write: writes) {
				XCTAssertEqual(ram[write.first >> 1], write.second, @"Didn't find %04x at address %08x; found %04x instead", write.second, write.first, ram[write.first >> 1]);

				// For now, indicate only the first failure.
				if(ram[write.first >> 1] != write.second) {
					break;
				}
			}
			writes.clear();
			state = State::LoggingWrites;
		}
		// Hack ends here.

		if([type isEqualToString:@"cread"] || [type isEqualToString:@"bread"] || [type isEqualToString:@"aread"]) {
			ram[param1 >> 1] = [event[2] integerValue];
			continue;
		}

		if([type isEqualToString:@"write"]) {
			writes.push_back(std::make_pair(uint32_t(param1), uint16_t([event[2] integerValue])));
			continue;
		}

		NSLog(@"Unhandled type: %@", type);
		XCTAssert(false);
		break;
	}
}

@end