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emulate internal ref point regs (fix mario kart & tonc m7_ex)

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Matthew Berry 2021-03-10 23:01:42 -08:00
parent f3e049b7d7
commit a2ccafefa2
2 changed files with 26 additions and 7 deletions
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25
src/crab/ppu.cr
View file

@ -16,7 +16,8 @@ class PPU
getter bghofs = Array(Reg::BGOFS).new 4 { Reg::BGOFS.new 0 }
getter bgvofs = Array(Reg::BGOFS).new 4 { Reg::BGOFS.new 0 }
getter bgaff = Array(Array(Reg::BGAFF)).new 2 { Array(Reg::BGAFF).new 4 { Reg::BGAFF.new 0 } }
getter bgref = Array(Array(Reg::BGREF)).new 2 { Array(Reg::BGREF).new 4 { Reg::BGREF.new 0 } }
getter bgref = Array(Array(Reg::BGREF)).new 2 { Array(Reg::BGREF).new 2 { Reg::BGREF.new 0 } }
getter bgref_int = Array(Array(Int32)).new 2 { Array(Int32).new 2, 0 }
getter win0h = Reg::WINH.new 0
getter win1h = Reg::WINH.new 0
getter win0v = Reg::WINV.new 0
@ -43,8 +44,14 @@ class PPU
@gba.interrupts.reg_if.hblank = true
@gba.interrupts.schedule_interrupt_check
end
scanline if @vcount < 160
@gba.dma.trigger_hdma if @vcount < 160
if @vcount < 160
scanline
@gba.dma.trigger_hdma
@bgref_int.each_with_index do |bgrefs, bg_num|
bgrefs[0] &+= @bgaff[bg_num][1].num # bgx += dmx
bgrefs[1] &+= @bgaff[bg_num][3].num # bgy += dmy
end
end
end
def end_hblank : Nil
@ -58,6 +65,7 @@ class PPU
elsif @vcount == 160
@dispstat.vblank = true
@gba.interrupts.reg_if.vblank = true if @dispstat.vblank_irq_enable
@bgref.each_with_index { |bgrefs, bg_num| bgrefs.each_with_index { |bgref, ref_num| @bgref_int[bg_num][ref_num] = bgref.num } }
draw
end
@gba.interrupts.schedule_interrupt_check
@ -173,8 +181,8 @@ class PPU
pal_buf = @layer_palettes[bg]
row = @vcount.to_u32
pa, pb, pc, pd = @bgaff[bg - 2].map { |p| p.value.to_i16!.to_i32! }
dx, dy = @bgref[bg - 2].map { |p| (p.value << 4).to_i32! >> 4 }
dx, _, dy, _ = @bgaff[bg - 2].map &.num
int_x, int_y = @bgref_int[bg - 2]
size = 16 << @bgcnt[bg].screen_size # tiles, always a square
size_pixels = size << 3
@ -182,8 +190,10 @@ class PPU
screen_base = 0x800_u32 * @bgcnt[bg].screen_base_block
character_base = @bgcnt[bg].character_base_block.to_u32 * 0x4000
240.times do |col|
x = ((pa * col + pb * row) + dx) >> 8
y = ((pc * col + pd * row) + dy) >> 8
x = int_x >> 8
y = int_y >> 8
int_x += dx
int_y += dy
if @bgcnt[bg].affine_wrap
x %= size_pixels
@ -432,6 +442,7 @@ class PPU
if offs >= 8
offs -= 8
@bgref[bg_num][offs >> 2].write_byte(offs & 3, value)
@bgref_int[bg_num][offs >> 2] = @bgref[bg_num][offs >> 2].num
else
@bgaff[bg_num][offs >> 1].write_byte(offs & 1, value)
end

8
src/crab/reg.cr
View file

@ -156,6 +156,10 @@ module Reg
bool sign
num integer, 7
num fraction, 8
def num : Int16
value.to_i16!
end
end
class BGREF < BitField(UInt32)
@ -164,6 +168,10 @@ module Reg
bool sign
num integer, 19
num fraction, 8
def num : Int32
(value << 4).to_i32! >> 4
end
end
class WINH < BitField(UInt16)