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Preliminary and experimental Game Boy support
This commit is contained in:
Karol Stasiak
parent
69ccd993b2
commit
43e75276df
1
.gitignore
vendored
1
.gitignore
vendored
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@ -36,6 +36,7 @@ examples/lunix/
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*.tap
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*.d88
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*.com
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*.gb
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HELLO
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HELLOCPC
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@ -39,6 +39,10 @@ how to create a program made of multiple files loaded on demand
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* [MMC4 example](nes/nestest_mmc4.mfk) – the same thing as above, but uses a MMC4 mapper just to test bankswitching
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## Game Boy examples
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* [GB test example](gb/gbtest.mfk) – a partial port of the NES example, with a rudimentary experimental text output implementation
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## Atari 2600 examples
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* [Colors](vcs/colors.mfk) – simple static rasterbars
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250
examples/gb/gbtest.mfk
Normal file
250
examples/gb/gbtest.mfk
Normal file
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@ -0,0 +1,250 @@
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// compile with -t gb_small
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import gb_hardware
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import gb_joy
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import stdio
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array oam_buffer[$a0] align(256)
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sbyte sprite_direction
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byte old_a
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void on_vblank(){
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flush_putchar_buffer()
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sprite_dma(oam_buffer.addr.hi)
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oam_buffer[1] += sprite_direction
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react_to_input()
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if oam_buffer[1] == 160 { sprite_direction = -1 }
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if oam_buffer[1] == 8 { sprite_direction = 1 }
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}
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void on_lcdc(){
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}
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void on_timer(){
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}
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void on_serial(){
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}
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void on_joypad(){
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}
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void react_to_input() {
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read_joy()
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if old_a == 0 && input_a != 0 { // A button
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sprite_direction = 0 - sprite_direction
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low_c()
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}
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old_a = input_a
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if input_dy < 0 { // Up button
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if oam_buffer[0] > 16 { oam_buffer[0] -= 1}
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}
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if input_dy > 0 { // Down button
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if oam_buffer[0] < 152 { oam_buffer[0] += 1}
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}
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}
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void low_c() {
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}
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void high_c() {
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}
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void main() {
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byte i
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for i,0,paralleluntil,$a0 {
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oam_buffer[i] = 0
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}
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reg_obj0_palette = 0q2222
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load_charset()
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init_putchar()
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reg_lcd_ctrl = lcd_tile_8000 | lcd_bg_on | lcd_obj_on | lcd_win_off | lcd_map_9800
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enable_lcd()
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enable_irq()
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putstrz("HELLO WORLD"z)
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new_line()
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sprite_direction = 1
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oam_buffer[0] = 50
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oam_buffer[1] = 8
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oam_buffer[2] = '@'
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oam_buffer[3] = 0
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while(true){}
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}
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void load_charset() {
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pointer s
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pointer d
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s = charset.addr
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d = $8200
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while s < charset.addr + $300 {
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d[0] = s[0]
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d += 1
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d[0] = s[0]
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d += 1
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s += 1
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}
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}
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array charset = [
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$00,$00,$00,$00,$00,$00,$00,$00,
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$18,$18,$18,$18,$00,$00,$18,$00,
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$66,$66,$66,$00,$00,$00,$00,$00,
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$66,$66,$FF,$66,$FF,$66,$66,$00,
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$18,$3E,$60,$3C,$06,$7C,$18,$00,
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$62,$66,$0C,$18,$30,$66,$46,$00,
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$3C,$66,$3C,$38,$67,$66,$3F,$00,
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$06,$0C,$18,$00,$00,$00,$00,$00,
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$0C,$18,$30,$30,$30,$18,$0C,$00,
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$30,$18,$0C,$0C,$0C,$18,$30,$00,
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$00,$66,$3C,$FF,$3C,$66,$00,$00,
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$00,$18,$18,$7E,$18,$18,$00,$00,
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$00,$00,$00,$00,$00,$18,$18,$30,
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$00,$00,$00,$7E,$00,$00,$00,$00,
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$00,$00,$00,$00,$00,$18,$18,$00,
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$00,$03,$06,$0C,$18,$30,$60,$00,
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$3C,$66,$6E,$76,$66,$66,$3C,$00,
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$18,$18,$38,$18,$18,$18,$7E,$00,
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$3C,$66,$06,$0C,$30,$60,$7E,$00,
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$3C,$66,$06,$1C,$06,$66,$3C,$00,
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$06,$0E,$1E,$66,$7F,$06,$06,$00,
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$7E,$60,$7C,$06,$06,$66,$3C,$00,
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$3C,$66,$60,$7C,$66,$66,$3C,$00,
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$7E,$66,$0C,$18,$18,$18,$18,$00,
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$3C,$66,$66,$3C,$66,$66,$3C,$00,
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$3C,$66,$66,$3E,$06,$66,$3C,$00,
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$00,$00,$18,$00,$00,$18,$00,$00,
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$00,$00,$18,$00,$00,$18,$18,$30,
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$0E,$18,$30,$60,$30,$18,$0E,$00,
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$00,$00,$7E,$00,$7E,$00,$00,$00,
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$70,$18,$0C,$06,$0C,$18,$70,$00,
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$3C,$66,$06,$0C,$18,$00,$18,$00,
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$3C,$66,$6E,$6E,$60,$62,$3C,$00,
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$18,$3C,$66,$7E,$66,$66,$66,$00,
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$7C,$66,$66,$7C,$66,$66,$7C,$00,
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$3C,$66,$60,$60,$60,$66,$3C,$00,
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$78,$6C,$66,$66,$66,$6C,$78,$00,
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$7E,$60,$60,$78,$60,$60,$7E,$00,
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$7E,$60,$60,$78,$60,$60,$60,$00,
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$3C,$66,$60,$6E,$66,$66,$3C,$00,
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$66,$66,$66,$7E,$66,$66,$66,$00,
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$3C,$18,$18,$18,$18,$18,$3C,$00,
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$1E,$0C,$0C,$0C,$0C,$6C,$38,$00,
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$66,$6C,$78,$70,$78,$6C,$66,$00,
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$60,$60,$60,$60,$60,$60,$7E,$00,
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$63,$77,$7F,$6B,$63,$63,$63,$00,
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$66,$76,$7E,$7E,$6E,$66,$66,$00,
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$3C,$66,$66,$66,$66,$66,$3C,$00,
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$7C,$66,$66,$7C,$60,$60,$60,$00,
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$3C,$66,$66,$66,$66,$3C,$0E,$00,
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$7C,$66,$66,$7C,$78,$6C,$66,$00,
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$3C,$66,$60,$3C,$06,$66,$3C,$00,
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$7E,$18,$18,$18,$18,$18,$18,$00,
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$66,$66,$66,$66,$66,$66,$3C,$00,
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$66,$66,$66,$66,$66,$3C,$18,$00,
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$63,$63,$63,$6B,$7F,$77,$63,$00,
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$66,$66,$3C,$18,$3C,$66,$66,$00,
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$66,$66,$66,$3C,$18,$18,$18,$00,
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$7E,$06,$0C,$18,$30,$60,$7E,$00,
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$3C,$30,$30,$30,$30,$30,$3C,$00,
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$0C,$12,$30,$7C,$30,$62,$FC,$00,
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$3C,$0C,$0C,$0C,$0C,$0C,$3C,$00,
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$00,$18,$3C,$7E,$18,$18,$18,$18,
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$00,$10,$30,$7F,$7F,$30,$10,$00,$FF,$FF,$FF,$FF,$FF,$FF,$FF,$FF
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]
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// the following is an experimental implementation of text output for Game Boy
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// if it matures, it might get mainlined into the standard distribution
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array putchar_buffer[256]
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byte putchar_buffer_start
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byte putchar_buffer_size
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byte putchar_column
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byte putchar_row
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volatile byte putchar_lock
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void init_putchar() {
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putchar_buffer_start = 0
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putchar_buffer_size = 0
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putchar_column = 0
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putchar_row = 0
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putchar_lock = 0
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}
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asm void putchar(byte e) {
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ld a,(putchar_buffer_size)
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cp $ff
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jr nz, __putchar_do
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halt
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jr putchar
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__putchar_do:
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ld b,a
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ld a,1
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ld (putchar_lock),a
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ld a,(putchar_buffer_start)
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add a,b
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ld c,a
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ld b,0
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ld hl,putchar_buffer.addr
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add hl,bc
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ld (hl),e
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ld hl,putchar_buffer_size.addr
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inc (hl)
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xor a
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ld (putchar_lock),a
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ret
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}
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// TODO: ???
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noinline pointer calculate_cursor() {
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pointer p
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p = putchar_column
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p <<= 5
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p += putchar_row
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p += $9800
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return p
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}
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void new_line() {
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putchar(13)
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putchar(10)
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}
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void flush_putchar_buffer() {
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pointer dest
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pointer src
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if putchar_lock != 0 { return }
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if putchar_buffer_size == 0 { return }
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src = putchar_buffer.addr + putchar_buffer_start
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dest = calculate_cursor()
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byte i
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byte c
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for i,0,paralleluntil,putchar_buffer_size {
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c = src[0]
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src += 1
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if c == 13 {
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putchar_column = 0
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dest.lo &= $E0
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} else if c == 10 {
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putchar_row += 1
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dest += 32
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} else {
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dest[0] = c
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dest += 1
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putchar_column += 1
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if putchar_column == 20 {
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putchar_column = 0
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putchar_row += 1
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dest.lo &= $E0
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dest += 32
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}
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}
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}
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putchar_buffer_start += putchar_buffer_size
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putchar_buffer_size = 0
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}
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171
include/gb_hardware.mfk
Normal file
171
include/gb_hardware.mfk
Normal file
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@ -0,0 +1,171 @@
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#if not(GAMEBOY)
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#warn gb_hardware module should be only used on NES/Famicom targets
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#endif
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#pragma zilog_syntax
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// TODO: optimize?
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array __vectors @ $40 = [
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$c3, __on_vblank.addr.lo, __on_vblank.addr.hi, 0,0,0,0,0,
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$c3, __on_lcdc.addr.lo, __on_lcdc.addr.hi, 0,0,0,0,0,
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$c3, __on_timer.addr.lo, __on_timer.addr.hi, 0,0,0,0,0,
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$c3, __on_serial.addr.lo, __on_serial.addr.hi, 0,0,0,0,0,
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$c3, __on_joypad.addr.lo, __on_joypad.addr.hi, 0,0,0,0,0
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]
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asm void __start() @ $150 {
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di
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ld sp, $DFFF
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xor a
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ldh (reg_irq_flag), a
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? ld a,ief_vblank
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ldh (reg_irq_enable), a
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? call disable_lcd
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? call clear_ram
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// copy the DMA routine to hi RAM
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ld hl, __sprite_dma_template
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ld de, __sprite_dma_actual
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ld c, __sprite_dma_actual.length
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__copy_sprite_dma_template:
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ld a,(hli)
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ld (de),a
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inc de
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dec c
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jr nz, __copy_sprite_dma_template
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? jp main
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? jp __start
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}
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asm void clear_ram() {
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? xor a
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? ld hl,$c000
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? ld bc,$1ff0
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? call memset
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? ld hl,$8000
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? ld bc,$2000
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? call memset
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? ld hl,$fe00
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? ld bc,$a0
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? call memset
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? ld hl,$ff80
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? ld bc,$7f
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? call memset
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? ret
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}
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inline asm void memset(word hl, word bc) {
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? inc c
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? inc b
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? jr __memzero_start
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__memzero_loop:
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ld (hli), a
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__memzero_start:
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dec c
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jr nz, __memzero_loop
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dec b
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jr nz, __memzero_loop
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? ret
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}
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interrupt void __on_vblank(){
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on_vblank()
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}
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interrupt void __on_lcdc(){
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on_lcdc()
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}
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interrupt void __on_timer(){
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on_timer()
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}
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interrupt void __on_serial(){
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on_serial()
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}
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interrupt void __on_joypad(){
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on_joypad()
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}
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array oam[$a0] @$fe00
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volatile byte reg_joypad @$ff00
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volatile byte reg_irq_flag @$ff0f
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volatile byte reg_lcd_ctrl @$ff40
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volatile byte reg_lcd_status @$ff41
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volatile byte reg_scroll_y @$ff42
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volatile byte reg_scroll_x @$ff43
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volatile byte reg_dma @$ff46
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volatile byte reg_bg_palette @$ff47
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volatile byte reg_obj0_palette @$ff48
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volatile byte reg_obj1_palette @$ff49
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volatile byte reg_window_y @$ff4A
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volatile byte reg_window_x @$ff4B
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volatile byte reg_vram_bank @$ff4f
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volatile byte reg_irq_enable @$ffff
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const byte lcd_on = $80
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const byte lcd_off = 0
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const byte lcd_win_9c00 = $40
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const byte lcd_win_9800 = 0
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const byte lcd_win_on = $20
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const byte lcd_win_off = 0
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const byte lcd_tile_8000 = $10
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const byte lcd_tile_8800 = 0
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const byte lcd_map_9c00 = 8
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const byte lcd_map_9800 = 0
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const byte lcd_obj_16 = 4
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const byte lcd_obj_8 = 0
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const byte lcd_obj_on = 2
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const byte lcd_obj_off = 0
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const byte lcd_bg_on = 1
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const byte lcd_bg_off = 1
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const byte ief_vblank = 1
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segment(hiram)
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array __sprite_dma_actual[8]
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asm void __sprite_dma_template() {
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ldh (reg_dma),a
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ld a, $28
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__sprite_dma_wait:
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dec a
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jr nz, __sprite_dma_wait
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ret
|
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__sprite_dma_end:
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}
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asm void sprite_dma(byte a) {
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jp __sprite_dma_actual
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}
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|
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asm byte wait_for_vblank() {
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ld hl, reg_irq_flag
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__wait_for_vblank_loop:
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ld a, ief_vblank
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halt
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||||
and (hl)
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jr z, __wait_for_vblank_loop
|
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? ld a, $ff ^ ief_vblank
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? and (hl)
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? ret
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}
|
||||
|
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asm void disable_lcd() {
|
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? call wait_for_vblank
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ldh a,(reg_lcd_ctrl)
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res 7,a
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||||
ldh (reg_lcd_ctrl),a
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? ret
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}
|
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asm void enable_lcd() {
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? call wait_for_vblank
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ldh a,(reg_lcd_ctrl)
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set 7,a
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ldh (reg_lcd_ctrl),a
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? ret
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||||
}
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22
include/gb_header_small.mfk
Normal file
22
include/gb_header_small.mfk
Normal file
|
|
@ -0,0 +1,22 @@
|
|||
#if not(GAMEBOY)
|
||||
#warn gb_header_small module should be only used on NES/Famicom targets
|
||||
#endif
|
||||
|
||||
#pragma zilog_syntax
|
||||
|
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array __header @ $100 = [
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$00, $C3, $50, $01, $CE, $ED, $66, $66, $CC, $0D, $00, $0B, $03, $73, $00, $83,
|
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$00, $0C, $00, $0D, $00, $08, $11, $1F, $88, $89, $00, $0E, $DC, $CC, $6E, $E6,
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$DD, $DD, $D9, $99, $BB, $BB, $67, $63, $6E, $0E, $EC, $CC, $DD, $DC, $99, $9F,
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||||
$BB, $B9, $33, $3E,
|
||||
"PROGRAM" ascii, 0,0,0,0,0,0,0,0,
|
||||
0,0, // no new license code
|
||||
0, // no SGB support
|
||||
0, // ROM only
|
||||
0, // 32 kB
|
||||
0, // no RAM
|
||||
0, // Japan
|
||||
0, // unlicensed
|
||||
0,0, // checksum, will patch later
|
||||
0,0 // global checksum, will patch later
|
||||
]
|
||||
47
include/gb_joy.mfk
Normal file
47
include/gb_joy.mfk
Normal file
|
|
@ -0,0 +1,47 @@
|
|||
#if not(GAMEBOY)
|
||||
#warn gb_joy module should be only used on NES/Famicom targets
|
||||
#endif
|
||||
|
||||
import gb_hardware
|
||||
|
||||
#pragma zilog_syntax
|
||||
|
||||
// standard joystick driver for Game Boy
|
||||
|
||||
import joy
|
||||
|
||||
alias input_a = input_btn
|
||||
byte input_b
|
||||
byte input_select
|
||||
byte input_start
|
||||
|
||||
void read_joy() {
|
||||
byte tmp
|
||||
reg_joypad = $20
|
||||
asm {
|
||||
ld a,(reg_joypad)
|
||||
ld a,(reg_joypad)
|
||||
ld a,(reg_joypad)
|
||||
ld a,(reg_joypad)
|
||||
}
|
||||
tmp = reg_joypad
|
||||
input_dx = 0
|
||||
input_dy = 0
|
||||
if tmp & 1 == 0 { input_dx += 1 }
|
||||
if tmp & 2 == 0 { input_dx -= 1 }
|
||||
if tmp & 4 == 0 { input_dy -= 1 }
|
||||
if tmp & 8 == 0 { input_dy += 1 }
|
||||
reg_joypad = $10
|
||||
asm {
|
||||
ld a,(reg_joypad)
|
||||
ld a,(reg_joypad)
|
||||
ld a,(reg_joypad)
|
||||
ld a,(reg_joypad)
|
||||
}
|
||||
byte tmp
|
||||
tmp = reg_joypad ^ $ff
|
||||
input_a = (tmp & 1) >> 0
|
||||
input_b = (tmp & 2) >> 1
|
||||
input_select = (tmp & 4) >> 2
|
||||
input_start = (tmp & 8) >> 3
|
||||
}
|
||||
34
include/gb_small.ini
Normal file
34
include/gb_small.ini
Normal file
|
|
@ -0,0 +1,34 @@
|
|||
[compilation]
|
||||
arch=lr35902
|
||||
encoding=ascii
|
||||
screen_encoding=ascii
|
||||
modules=default_panic,stdlib,gb_hardware,gb_header_small
|
||||
|
||||
|
||||
[allocation]
|
||||
|
||||
segments=default,rom,hiram
|
||||
default_code_segment=rom
|
||||
|
||||
segment_default_start=$c000
|
||||
segment_default_end=$dfff
|
||||
|
||||
segment_rom_start=$0150
|
||||
segment_rom_end=$7fff
|
||||
segment_hiram_start=$ff80
|
||||
segment_hiram_end=$fffe
|
||||
|
||||
[define]
|
||||
GAMEBOY=1
|
||||
WIDESCREEN=0
|
||||
KEYBOARD=0
|
||||
JOYSTICKS=1
|
||||
HAS_BITMAP_MODE=0
|
||||
|
||||
[output]
|
||||
style=single
|
||||
format=rom:0:$7fff
|
||||
gb_checksum=true
|
||||
extension=gb
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user