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never clear flags in IF directly

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This commit is contained in:
Matthew Berry 2021-02-25 00:59:30 -08:00
parent a5dd6ba394
commit b9c360f229
1 changed files with 7 additions and 7 deletions
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14
src/crab/ppu.cr
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@ -39,28 +39,28 @@ class PPU
def start_hblank : Nil
@gba.scheduler.schedule 272, ->end_hblank
@dispstat.hblank = true
@gba.interrupts.reg_if.hblank = @dispstat.hblank_irq_enable
@gba.interrupts.schedule_interrupt_check if @dispstat.hblank_irq_enable
if @dispstat.hblank_irq_enable
@gba.interrupts.reg_if.hblank = true
@gba.interrupts.schedule_interrupt_check
end
scanline if @vcount < 160
@gba.dma.trigger_hdma if @vcount < 160
end
def end_hblank : Nil
@gba.scheduler.schedule 0, ->start_line
@dispstat.hblank = false
@gba.interrupts.reg_if.hblank = false
@vcount = (@vcount + 1) % 228
@dispstat.vcounter = @vcount == @dispstat.vcount_setting
@gba.interrupts.reg_if.vcounter = @dispstat.vcounter_irq_enable && @dispstat.vcounter
@gba.interrupts.reg_if.vcounter = true if @dispstat.vcounter_irq_enable && @dispstat.vcounter
if @vcount == 0
@dispstat.vblank = false
@gba.interrupts.reg_if.vblank = false
elsif @vcount == 160
@dispstat.vblank = true
@gba.interrupts.reg_if.vblank = @dispstat.vblank_irq_enable
@gba.interrupts.reg_if.vblank = true if @dispstat.vblank_irq_enable
draw
end
@gba.interrupts.schedule_interrupt_check
@gba.scheduler.schedule 0, ->start_line
end
def draw : Nil