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System: Basic timings for GPU scanout

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This commit is contained in:
Connor McLaughlin
2019-09-17 14:25:25 +10:00
parent 9475c281bd
commit f47688b61f
7 changed files with 268 additions and 34 deletions
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47
src/pse/cpu_core.cpp
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@ -24,6 +24,8 @@ bool Core::Initialize(Bus* bus)
void Core::Reset()
{
m_slice_ticks = std::numeric_limits<decltype(m_slice_ticks)>::max();
m_regs = {};
m_cop0_regs.BPC = 0;
@ -40,6 +42,7 @@ void Core::Reset()
bool Core::DoState(StateWrapper& sw)
{
sw.Do(&m_slice_ticks);
sw.DoArray(m_regs.r, countof(m_regs.r));
sw.Do(&m_regs.pc);
sw.Do(&m_regs.hi);
@ -269,28 +272,38 @@ void Core::DisassembleAndPrint(u32 addr)
PrintInstruction(bits, addr);
}
void Core::Execute()
TickCount Core::Execute()
{
// now executing the instruction we previously fetched
const Instruction inst = m_next_instruction;
m_current_instruction_pc = m_regs.pc;
TickCount executed_ticks = 0;
while (executed_ticks < m_slice_ticks)
{
executed_ticks++;
// fetch the next instruction
if (!FetchInstruction())
return;
// now executing the instruction we previously fetched
const Instruction inst = m_next_instruction;
m_current_instruction_pc = m_regs.pc;
// handle branch delays - we are now in a delay slot if we just branched
m_in_branch_delay_slot = m_branched;
m_branched = false;
// fetch the next instruction
if (!FetchInstruction())
continue;
// execute the instruction we previously fetched
ExecuteInstruction(inst);
// handle branch delays - we are now in a delay slot if we just branched
m_in_branch_delay_slot = m_branched;
m_branched = false;
// next load delay
m_load_delay_reg = m_next_load_delay_reg;
m_next_load_delay_reg = Reg::count;
m_load_delay_old_value = m_next_load_delay_old_value;
m_next_load_delay_old_value = 0;
// execute the instruction we previously fetched
ExecuteInstruction(inst);
// next load delay
m_load_delay_reg = m_next_load_delay_reg;
m_next_load_delay_reg = Reg::count;
m_load_delay_old_value = m_next_load_delay_old_value;
m_next_load_delay_old_value = 0;
}
// reset slice ticks, it'll be updated when the components execute
m_slice_ticks = MAX_CPU_SLICE_SIZE;
return executed_ticks;
}
bool Core::FetchInstruction()