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Introduces get_confidence for the ColecoVision.

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Based almost entirely on joypad accesses for now.
This commit is contained in:
Thomas Harte 2018-03-06 19:06:35 -05:00
parent fdef914137
commit c82af4b814
1 changed files with 16 additions and 0 deletions
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16
Machines/ColecoVision/ColecoVision.cpp
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@ -23,6 +23,8 @@
#include "../../Outputs/Speaker/Implementation/CompoundSource.hpp"
#include "../../Outputs/Speaker/Implementation/LowpassSpeaker.hpp"
#include "../../Analyser/Dynamic/ConfidenceCounter.hpp"
namespace {
const int sn76489_divider = 2;
}
@ -195,6 +197,7 @@ class ConcreteMachine:
uint16_t address = cycle.address ? *cycle.address : 0x0000;
switch(cycle.operation) {
case CPU::Z80::PartialMachineCycle::ReadOpcode:
if(!address) pc_zero_accesses_++;
case CPU::Z80::PartialMachineCycle::Read:
if(address < 0x2000) {
if(super_game_module_.replace_bios) {
@ -245,6 +248,11 @@ class ConcreteMachine:
} else {
*cycle.value = joystick->get_direction_input();
}
// Hitting exactly the recommended joypad input port is an indicator that
// this really is a ColecoVision game. The BIOS won't do this when just waiting
// to start a game (unlike accessing the VDP and SN).
if((address&0xfc) == 0xfc) confidence_counter_.add_hit();
} break;
default:
@ -329,6 +337,11 @@ class ConcreteMachine:
audio_queue_.perform();
}
float get_confidence() override {
if(pc_zero_accesses_ > 1) return 0.0f;
return confidence_counter_.get_confidence();
}
private:
inline void page_megacart(uint16_t address) {
const std::size_t selected_start = (static_cast<std::size_t>(address&63) << 14) % cartridge_.size();
@ -368,6 +381,9 @@ class ConcreteMachine:
HalfCycles time_since_vdp_update_;
HalfCycles time_since_sn76489_update_;
HalfCycles time_until_interrupt_;
Analyser::Dynamic::ConfidenceCounter confidence_counter_;
int pc_zero_accesses_ = 0;
};
}