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Introduces new failing test for rational continuous interrupt prediction.

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Thomas Harte 2018-10-21 13:59:14 -04:00
parent 16f08eb654
commit b3f1677da5
1 changed files with 41 additions and 0 deletions
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41
OSBindings/Mac/Clock SignalTests/MasterSystemVDPTests.mm
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@ -116,4 +116,45 @@
NSAssert(vdp.get_interrupt_line(), @"Interrupt line wasn't set when promised");
}
- (void)testPrediction {
TI::TMS::TMS9918 vdp(TI::TMS::Personality::SMSVDP);
for(int c = 0; c < 256; ++c) {
for(int with_eof = 0; with_eof < 2; ++with_eof) {
// Enable or disable end-of-frame interrupts as required.
vdp.set_register(1, with_eof ? 0x20 : 0x00);
vdp.set_register(1, 0x81);
// Enable line interrupts.
vdp.set_register(1, 0x10);
vdp.set_register(1, 0x80);
// Set the line interrupt timing as desired.
vdp.set_register(1, c);
vdp.set_register(1, 0x8a);
// Now run through an entire frame...
int half_cycles = 262*224*2;
int last_time_until_interrupt = vdp.get_time_until_interrupt().as_int();
while(half_cycles--) {
// Validate that an interrupt happened if one was expected, and clear anything that's present.
NSAssert(vdp.get_interrupt_line() == (last_time_until_interrupt == 0), @"Unexpected interrupt state change");
vdp.get_register(1);
vdp.run_for(HalfCycles(1));
// Get the time until interrupt.
int time_until_interrupt = vdp.get_time_until_interrupt().as_int();
NSAssert(time_until_interrupt != -1, @"No interrupt scheduled");
NSAssert(time_until_interrupt >= 0, @"Interrupt is scheduled in the past");
if(last_time_until_interrupt) {
NSAssert(time_until_interrupt == (last_time_until_interrupt - 1), @"Discontinuity found in interrupt prediction; from %d to %d for %d %d @ %d", last_time_until_interrupt, time_until_interrupt, c, with_eof, half_cycles);
}
last_time_until_interrupt = time_until_interrupt;
}
}
}
}
@end