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fixed ppu interrupt flags

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This commit is contained in:
Matthew Berry 2020-12-13 12:37:07 -08:00
parent 0c39869653
commit 4b6563773c
1 changed files with 7 additions and 8 deletions
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15
src/crab/ppu.cr
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@ -154,23 +154,23 @@ class PPU
def start_hblank : Nil
@gba.scheduler.schedule 272, ->end_hblank
@dispstat.hblank = true
@gba.interrupts.reg_if.hblank = false
@gba.interrupts.schedule_interrupt_check
@gba.interrupts.reg_if.hblank = @dispstat.hblank_irq_enable
@gba.interrupts.schedule_interrupt_check if @dispstat.hblank_irq_enable
scanline if @vcount < 160
end
def end_hblank : Nil
@dispstat.hblank = false
@gba.interrupts.reg_if.hblank = @dispstat.hblank_irq_enable
@vcount += 1
@vcount %= 228
@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 = @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 && @dispstat.vblank
@gba.interrupts.reg_if.vblank = @dispstat.vblank_irq_enable
draw
end
@gba.interrupts.schedule_interrupt_check
@ -211,7 +211,6 @@ class PPU
240.times do |col|
effective_col = (col + @bg0hofs.value) % (tw << 3)
tx = effective_col >> 3
x = effective_col & 7
se_idx = se_index(tx, ty, @bg0cnt.screen_size)
screen_entry = @vram[screen_base + se_idx * 2 + 1].to_u16 << 8 | @vram[screen_base + se_idx * 2]