public void GpuFramesPerSecondBenchmark()
{
Mode lcdMode = 0;
byte currentLine = 0;
var mmu = new StubIMmu
{
ReadByteUInt16 = a => RandomByte(),
LcdCurrentLineGet = () => currentLine,
LcdCurrentLineSetByte = l => currentLine = l,
LcdModeGet = () => lcdMode,
LcdModeSetMode = m => lcdMode = m,
LcdEnabledGet = () => true,
DisplayBackgroundGet = () => true,
DisplayWindowGet = () => true,
DisplaySpritesGet = () => true
};
var gpu = new Gpu(mmu);
var drawCount = 0;
var sw = new Stopwatch(); sw.Start();
for (int i = 0; i < _numSteps; i++)
{
drawCount += gpu.Step(RandomCycleCount()) ? 1 : 0;
}
sw.Stop();
var stepsPerSecond = (decimal)(_numSteps / sw.Elapsed.TotalSeconds);
var framesPerSecond = (decimal)(drawCount / sw.Elapsed.TotalSeconds);
var speedupFactor = framesPerSecond / 60;
TestContext.WriteLine($"Steps per second: {stepsPerSecond.ToString("N")}");
TestContext.WriteLine($"Frames per second: {framesPerSecond.ToString("N")}");
TestContext.WriteLine($"Speedup factor: {speedupFactor.ToString("N")}");
}
private void RunTest(StubIMmu mmu)
{
var cpu = new Cpu(mmu);
long cycles = 0;
var sw = new Stopwatch(); sw.Start();
for (int i = 0; i < _numInstructions; i++)
{
cycles += cpu.Step();
}
sw.Stop();
cycles *= 4; // Cpu returns 1/4 cycles
var insPerSecond = (decimal)(_numInstructions / sw.Elapsed.TotalSeconds);
var cyclesPerSecond = (decimal)(cycles / sw.Elapsed.TotalSeconds);
var speedupFactor = cyclesPerSecond / 4194304;
TestContext.WriteLine($"Instructions per second: {insPerSecond.ToString("N")}");
TestContext.WriteLine($"Cycles per second: {cyclesPerSecond.ToString("N")}");
TestContext.WriteLine($"Speedup factor: {speedupFactor.ToString("N")}");
}
private CpuState Test(CpuState cpuState)
{
var mem = new Dictionary<ushort, byte>();
foreach (var m in cpuState.Memory)
{
mem.Add(m.Address, m.Value);
}
var read = new FakesDelegates.Func<ushort, byte>(a =>
{
if (!mem.ContainsKey(a))
{
return 0; // Only writes allocate memory
}
return mem[a];
});
var readW = new FakesDelegates.Func<ushort, ushort>(a =>
{
var hi = read(a);
var lo = read((ushort)(a + 1));
return (ushort)((hi << 8) | lo);
});
var mmu = new StubIMmu();
mmu.ReadByteUInt16 = read;
mmu.ReadWordUInt16 = readW;
mmu.WriteByteUInt16Byte = (a, v) =>
{
mem[a] = v;
};
mmu.WriteWordUInt16UInt16 = (a, v) =>
{
mem[a] = (byte)((v & 0xFF00) >> 8);
mem[(ushort)(a + 1)] = (byte)(v & 0xFF);
};
var cpu = new TestCpu(mmu,
cpuState.A, cpuState.B, cpuState.C,
cpuState.D, cpuState.E, cpuState.H,
cpuState.L, cpuState.SP, cpuState.PC,
cpuState.FZ, cpuState.FN, cpuState.FH,
cpuState.FC, cpuState.IME);
cpu.Step();
return new CpuState
{
A = cpu.A,
B = cpu.B,
C = cpu.C,
D = cpu.D,
E = cpu.E,
H = cpu.H,
L = cpu.L,
SP = cpu.SP,
PC = cpu.PC,
FZ = cpu.FZ,
FN = cpu.FN,
FH = cpu.FH,
FC = cpu.FC,
IME = cpu.IME,
Memory = mem.Keys.OrderBy(k => k).Select(k =>
{
var v = mem[k];
return new MemoryRecord
{
Address = k,
Value = v
};
}).ToList()
};
}
private CpuState Test(CpuState cpuState)
{
var mem = new Dictionary <ushort, byte>();
foreach (var m in cpuState.Memory)
{
mem.Add(m.Address, m.Value);
}
var read = new FakesDelegates.Func <ushort, byte>(a =>
{
if (!mem.ContainsKey(a))
{
return(0); // Only writes allocate memory
}
return(mem[a]);
});
var readW = new FakesDelegates.Func <ushort, ushort>(a =>
{
var hi = read(a);
var lo = read((ushort)(a + 1));
return((ushort)((hi << 8) | lo));
});
var mmu = new StubIMmu();
mmu.ReadByteUInt16 = read;
mmu.ReadWordUInt16 = readW;
mmu.WriteByteUInt16Byte = (a, v) =>
{
mem[a] = v;
};
mmu.WriteWordUInt16UInt16 = (a, v) =>
{
mem[a] = (byte)((v & 0xFF00) >> 8);
mem[(ushort)(a + 1)] = (byte)(v & 0xFF);
};
var cpu = new TestCpu(mmu,
cpuState.A, cpuState.B, cpuState.C,
cpuState.D, cpuState.E, cpuState.H,
cpuState.L, cpuState.SP, cpuState.PC,
cpuState.FZ, cpuState.FN, cpuState.FH,
cpuState.FC, cpuState.IME);
cpu.Step();
return(new CpuState
{
A = cpu.A,
B = cpu.B,
C = cpu.C,
D = cpu.D,
E = cpu.E,
H = cpu.H,
L = cpu.L,
SP = cpu.SP,
PC = cpu.PC,
FZ = cpu.FZ,
FN = cpu.FN,
FH = cpu.FH,
FC = cpu.FC,
IME = cpu.IME,
Memory = mem.Keys.OrderBy(k => k).Select(k =>
{
var v = mem[k];
return new MemoryRecord
{
Address = k,
Value = v
};
}).ToList()
});
}
