gbdk-2020 | GameBoy Development Kit |
| download: https://git.y1.nz/archives/gbdk.tar.gz | |
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commit 5719880955a8495c6045bd2ecbec31f9bc166cb9 parent 7c992c8ea5f0b09805e1e4de972538d6f354c7ab Author: Toxa <56631470+untoxa@users.noreply.github.com> Date: Sun, 29 Jan 2023 23:45:04 +0400 Merge pull request #471 from michel-iwaniec/nes_metasprite_clipping_support NES: Add metasprite clipping support Diffstat:
| M | gbdk-lib/examples/cross-platform/metasprites/src/metasprites.c | 2 | +- |
| M | gbdk-lib/include/nes/metasprites.h | 30 | +++++++++++++++--------------- |
| M | gbdk-lib/libc/targets/mos6502/nes/Makefile | 4 | +++- |
| M | gbdk-lib/libc/targets/mos6502/nes/metasprites.s | 203 | ++++++++++++++++++++++--------------------------------------------------------- |
| A | gbdk-lib/libc/targets/mos6502/nes/metasprites_common.s | 40 | ++++++++++++++++++++++++++++++++++++++++ |
| A | gbdk-lib/libc/targets/mos6502/nes/metasprites_flipx.s | 114 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | gbdk-lib/libc/targets/mos6502/nes/metasprites_flipxy.s | 115 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
| A | gbdk-lib/libc/targets/mos6502/nes/metasprites_flipy.s | 113 | +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ |
8 files changed, 456 insertions(+), 165 deletions(-)
diff --git a/gbdk-lib/examples/cross-platform/metasprites/src/metasprites.c b/gbdk-lib/examples/cross-platform/metasprites/src/metasprites.c @@ -54,7 +54,7 @@ const uint8_t pattern[] = {0x80,0x80,0x40,0x40,0x20,0x20,0x10,0x10,0x08,0x08,0x0 #define TILE_NUM_START 0 // sprite coords -uint16_t PosX, PosY; +int16_t PosX, PosY; int16_t SpdX, SpdY; uint8_t PosF; uint8_t hide, jitter; diff --git a/gbdk-lib/include/nes/metasprites.h b/gbdk-lib/include/nes/metasprites.h @@ -91,13 +91,13 @@ extern uint8_t __current_base_prop; extern uint8_t __render_shadow_OAM; -static uint8_t __move_metasprite(uint8_t id, uint8_t x, uint8_t y) OLDCALL; -static uint8_t __move_metasprite_flipx(uint8_t id, uint8_t x, uint8_t y) OLDCALL; -static uint8_t __move_metasprite_flipy(uint8_t id, uint8_t x, uint8_t y) OLDCALL; -static uint8_t __move_metasprite_flipxy(uint8_t id, uint8_t x, uint8_t y) OLDCALL; -static uint8_t __move_metasprite_vflip(uint8_t id, uint8_t x, uint8_t y) OLDCALL; -static uint8_t __move_metasprite_hflip(uint8_t id, uint8_t x, uint8_t y) OLDCALL; -static uint8_t __move_metasprite_hvflip(uint8_t id, uint8_t x, uint8_t y) OLDCALL; +static uint8_t __move_metasprite(uint8_t id, int16_t x, int16_t y) OLDCALL; +static uint8_t __move_metasprite_flipx(uint8_t id, int16_t x, int16_t y) OLDCALL; +static uint8_t __move_metasprite_flipy(uint8_t id, int16_t x, int16_t y) OLDCALL; +static uint8_t __move_metasprite_flipxy(uint8_t id, int16_t x, int16_t y) OLDCALL; +static uint8_t __move_metasprite_vflip(uint8_t id, int16_t x, int16_t y) OLDCALL; +static uint8_t __move_metasprite_hflip(uint8_t id, int16_t x, int16_t y) OLDCALL; +static uint8_t __move_metasprite_hvflip(uint8_t id, int16_t x, int16_t y) OLDCALL; static void __hide_metasprite(uint8_t id) OLDCALL; /** @@ -129,7 +129,7 @@ void hide_sprites_range(UINT8 from, UINT8 to) OLDCALL; @return Number of hardware sprites used to draw this metasprite */ -inline uint8_t move_metasprite_ex(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_prop, uint8_t base_sprite, uint8_t x, uint8_t y) { +inline uint8_t move_metasprite_ex(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_prop, uint8_t base_sprite, int16_t x, int16_t y) { base_prop; __current_metasprite = metasprite; __current_base_tile = base_tile; @@ -139,7 +139,7 @@ inline uint8_t move_metasprite_ex(const metasprite_t * metasprite, uint8_t base_ /** Obsolete */ -inline uint8_t move_metasprite(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_sprite, uint8_t x, uint8_t y) { +inline uint8_t move_metasprite(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_sprite, int16_t x, int16_t y) { __current_metasprite = metasprite; __current_base_tile = base_tile; __current_base_prop = 0; @@ -167,7 +167,7 @@ inline uint8_t move_metasprite(const metasprite_t * metasprite, uint8_t base_til @see move_metasprite() */ -inline uint8_t move_metasprite_flipx(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_prop, uint8_t base_sprite, uint8_t x, uint8_t y) { +inline uint8_t move_metasprite_flipx(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_prop, uint8_t base_sprite, int16_t x, int16_t y) { base_prop; __current_metasprite = metasprite; __current_base_tile = base_tile; @@ -177,7 +177,7 @@ inline uint8_t move_metasprite_flipx(const metasprite_t * metasprite, uint8_t ba /** Obsolete */ -inline uint8_t move_metasprite_vflip(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_sprite, uint8_t x, uint8_t y) { +inline uint8_t move_metasprite_vflip(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_sprite, int16_t x, int16_t y) { __current_metasprite = metasprite; __current_base_tile = base_tile; __current_base_prop = 0; @@ -206,7 +206,7 @@ inline uint8_t move_metasprite_vflip(const metasprite_t * metasprite, uint8_t ba @see move_metasprite() */ -inline uint8_t move_metasprite_flipy(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_prop, uint8_t base_sprite, uint8_t x, uint8_t y) { +inline uint8_t move_metasprite_flipy(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_prop, uint8_t base_sprite, int16_t x, int16_t y) { base_prop; __current_metasprite = metasprite; __current_base_tile = base_tile; @@ -216,7 +216,7 @@ inline uint8_t move_metasprite_flipy(const metasprite_t * metasprite, uint8_t ba /** Obsolete */ -inline uint8_t move_metasprite_hflip(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_sprite, uint8_t x, uint8_t y) { +inline uint8_t move_metasprite_hflip(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_sprite, int16_t x, int16_t y) { __current_metasprite = metasprite; __current_base_tile = base_tile; __current_base_prop = 0; @@ -244,7 +244,7 @@ inline uint8_t move_metasprite_hflip(const metasprite_t * metasprite, uint8_t ba @see move_metasprite() */ -inline uint8_t move_metasprite_flipxy(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_prop, uint8_t base_sprite, uint8_t x, uint8_t y) { +inline uint8_t move_metasprite_flipxy(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_prop, uint8_t base_sprite, int16_t x, int16_t y) { base_prop; __current_metasprite = metasprite; __current_base_tile = base_tile; @@ -254,7 +254,7 @@ inline uint8_t move_metasprite_flipxy(const metasprite_t * metasprite, uint8_t b /** Obsolete */ -inline uint8_t move_metasprite_hvflip(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_sprite, uint8_t x, uint8_t y) { +inline uint8_t move_metasprite_hvflip(const metasprite_t * metasprite, uint8_t base_tile, uint8_t base_sprite, int16_t x, int16_t y) { __current_metasprite = metasprite; __current_base_tile = base_tile; __current_base_prop = 0; diff --git a/gbdk-lib/libc/targets/mos6502/nes/Makefile b/gbdk-lib/libc/targets/mos6502/nes/Makefile @@ -9,7 +9,9 @@ CSRC = crlf.c ASSRC = f_ibm_full.s f_ibm_sh.s f_italic.s f_min.s f_spect.s \ font.s font_color.s set_data.s set_1bit_data.s color.s mode.s \ - metasprites.s metasprites_hide.s metasprites_hide_spr.s \ + metasprites.s metasprites_flipx.s metasprites_flipy.s metasprites_flipxy.s \ + metasprites_common.s \ + metasprites_hide.s metasprites_hide_spr.s \ set_bk_ts.s set_tile_submap.s fill_rect_bk.s \ set_bk_attributes.s set_tile_submap_attributes.s flush_attributes.s \ nes_palettes.s \ diff --git a/gbdk-lib/libc/targets/mos6502/nes/metasprites.s b/gbdk-lib/libc/targets/mos6502/nes/metasprites.s @@ -4,75 +4,48 @@ .module Metasprites .area OSEG (PAG, OVR) + ___move_metasprite_PARM_2:: .ds 2 + ___move_metasprite_PARM_3:: .ds 2 ___current_metasprite:: .ds 2 ___current_base_tile:: .ds 1 ___current_base_prop:: .ds 1 - ___move_metasprite_hflip_PARM_3:: - ___move_metasprite_vflip_PARM_3:: - ___move_metasprite_hvflip_PARM_3:: - ___move_metasprite_flipx_PARM_3:: - ___move_metasprite_flipy_PARM_3:: - ___move_metasprite_flipxy_PARM_3:: - ___move_metasprite_PARM_3:: .ds 2 - - .area _INITIALIZED - ___render_shadow_OAM:: .ds 0x01 - - .area _INITIALIZER - .db #>_shadow_OAM .area _HOME -.define xPos ".tmp" +.define xPos "___move_metasprite_PARM_2" .define yPos "___move_metasprite_PARM_3" -.define id ".tmp+1" - -.move_metasprite_prologue: - sta *id - stx xPos - asl - asl - tax - ; Make 8x16 mode bit fetch from second pattern table by setting bit0 of tile index - lda *_shadow_PPUCTRL - lsr - lsr - lsr - lsr - lsr - and #1 - ora *___current_base_tile - sta *___current_base_tile - ldy #0 - rts -.move_metasprite_epilogue: - ; Return number of hardware sprites used - txa - lsr - lsr - sec - sbc *id - rts +; uint8_t __move_metasprite(uint8_t id, int16_t x, int16_t y) -; uint8_t __move_metasprite(uint8_t id, uint8_t x, uint8_t y) ___move_metasprite:: jsr .move_metasprite_prologue ___move_metasprite_loop: lda [*___current_metasprite],y ; dy - iny - cmp #0x80 - beq ___move_metasprite_end + bmi ___move_metasprite_dyNeg clc adc *yPos sta *yPos + bcc 1$ + inc *yPos+1 +1$: +___move_metasprite_loop_writePosY: sta _shadow_OAM+OAM_POS_Y,x - lda *xPos - clc - adc [*___current_metasprite],y ; dx + lda *yPos+1 + bne ___move_metasprite_outsideY iny + lda [*___current_metasprite],y ; dx + bmi ___move_metasprite_dxNeg + clc + adc *xPos sta *xPos + bcc 2$ + inc *xPos+1 +2$: +___move_metasprite_loop_writePosX: sta _shadow_OAM+OAM_POS_X,x + lda *xPos+1 + bne ___move_metasprite_outsideX + iny lda [*___current_metasprite],y ; tile index iny clc @@ -90,115 +63,49 @@ ___move_metasprite_loop: ___move_metasprite_end: jmp .move_metasprite_epilogue -; uint8_t __move_metasprite_vflip(uint8_t id, uint8_t x, uint8_t y) -___move_metasprite_flipx:: -___move_metasprite_vflip:: - jsr .move_metasprite_prologue -___move_metasprite_vflip_loop: - lda [*___current_metasprite],y ; dy - iny - cmp #0x80 - beq ___move_metasprite_vflip_end +___move_metasprite_dxNeg: clc - adc *yPos - sta *yPos - sta _shadow_OAM+OAM_POS_Y,x - lda *xPos - sec - sbc [*___current_metasprite],y ; dx - iny + adc *xPos sta *xPos - sta _shadow_OAM+OAM_POS_X,x - lda [*___current_metasprite],y ; tile index - iny - clc - adc *___current_base_tile - sta _shadow_OAM+OAM_TILE_INDEX,x - lda [*___current_metasprite],y ; props - adc *___current_base_prop - eor #OAMF_XFLIP - iny - sta _shadow_OAM+OAM_ATTRIBUTES,x - inx - inx - inx - inx - bne ___move_metasprite_vflip_loop -___move_metasprite_vflip_end: - jmp .move_metasprite_epilogue + bcs 1$ + dec *xPos+1 +1$: + jmp ___move_metasprite_loop_writePosX -; uint8_t __move_metasprite_hflip(uint8_t id, uint8_t x, uint8_t y) -___move_metasprite_flipy:: -___move_metasprite_hflip:: - jsr .move_metasprite_prologue -___move_metasprite_hflip_loop: - lda [*___current_metasprite],y ; dy - iny +___move_metasprite_dyNeg: cmp #0x80 - beq ___move_metasprite_hflip_end - eor #0xFF - sec + beq ___move_metasprite_end + clc adc *yPos sta *yPos - sta _shadow_OAM+OAM_POS_Y,x - lda *xPos - clc - adc [*___current_metasprite],y ; dx + bcs 1$ + dec *yPos+1 +1$: + jmp ___move_metasprite_loop_writePosY + +___move_metasprite_outsideY: iny + lda [*___current_metasprite],y ; dx + bmi ___move_metasprite_outsideY_dxNeg + clc + adc *xPos sta *xPos - sta _shadow_OAM+OAM_POS_X,x - lda [*___current_metasprite],y ; tile index + bcc ___move_metasprite_outsideX + inc *xPos+1 +___move_metasprite_outsideX: iny - clc - adc *___current_base_tile - sta _shadow_OAM+OAM_TILE_INDEX,x - lda [*___current_metasprite],y ; props - adc *___current_base_prop - eor #OAMF_YFLIP + ; Skip tile index / props iny - sta _shadow_OAM+OAM_ATTRIBUTES,x - inx - inx - inx - inx - bne ___move_metasprite_hflip_loop -___move_metasprite_hflip_end: - jmp .move_metasprite_epilogue - -; uint8_t __move_metasprite_hvflip(uint8_t id, uint8_t x, uint8_t y) -___move_metasprite_flipxy:: -___move_metasprite_hvflip:: - jsr .move_metasprite_prologue -___move_metasprite_hvflip_loop: - lda [*___current_metasprite],y ; dy iny - cmp #0x80 - beq ___move_metasprite_hvflip_end - eor #0xFF - sec - adc *yPos - sta *yPos + lda #0xF0 sta _shadow_OAM+OAM_POS_Y,x - lda *xPos - sec - sbc [*___current_metasprite],y ; dx - iny - sta *xPos - sta _shadow_OAM+OAM_POS_X,x - lda [*___current_metasprite],y ; tile index - iny + jmp ___move_metasprite_loop + +___move_metasprite_outsideY_dxNeg: clc - adc *___current_base_tile - sta _shadow_OAM+OAM_TILE_INDEX,x - lda [*___current_metasprite],y ; props - adc *___current_base_prop - eor #OAMF_YFLIP+OAMF_XFLIP - iny - sta _shadow_OAM+OAM_ATTRIBUTES,x - inx - inx - inx - inx - bne ___move_metasprite_hvflip_loop -___move_metasprite_hvflip_end: - jmp .move_metasprite_epilogue + adc *xPos + sta *xPos + bcs 1$ + dec *xPos+1 +1$: + jmp ___move_metasprite_outsideX diff --git a/gbdk-lib/libc/targets/mos6502/nes/metasprites_common.s b/gbdk-lib/libc/targets/mos6502/nes/metasprites_common.s @@ -0,0 +1,40 @@ + .include "global.s" + + .title "Metasprites" + .module Metasprites + + .area _HOME + + .area _INITIALIZED + ___render_shadow_OAM:: .ds 0x01 + + .area _INITIALIZER + .db #>_shadow_OAM + +.define id ".tmp+1" + +.move_metasprite_prologue:: + sta *id + asl + asl + tax + ; Make 8x16 mode bit fetch from second pattern table by setting bit0 of tile index + lda *_shadow_PPUCTRL + lsr + lsr + lsr + lsr + lsr + and #1 + ora *___current_base_tile + sta *___current_base_tile + rts + +.move_metasprite_epilogue:: + ; Return number of hardware sprites used + txa + lsr + lsr + sec + sbc *id + rts diff --git a/gbdk-lib/libc/targets/mos6502/nes/metasprites_flipx.s b/gbdk-lib/libc/targets/mos6502/nes/metasprites_flipx.s @@ -0,0 +1,114 @@ + .include "global.s" + + .title "Metasprites" + .module Metasprites + + .area OSEG (PAG, OVR) + ___move_metasprite_vflip_PARM_2:: + ___move_metasprite_flipx_PARM_2:: .ds 2 + ___move_metasprite_vflip_PARM_3:: + ___move_metasprite_flipx_PARM_3:: .ds 2 + + .area _HOME + +.define xPos "___move_metasprite_flipx_PARM_2" +.define yPos "___move_metasprite_flipx_PARM_3" + +; uint8_t __move_metasprite_flipx(uint8_t id, int16_t x, int16_t y) + +___move_metasprite_flipx:: +___move_metasprite_vflip:: + jsr .move_metasprite_prologue +___move_metasprite_flipx_loop: + lda [*___current_metasprite],y ; dy + bmi ___move_metasprite_flipx_dyNeg + clc + adc *yPos + sta *yPos + bcc 1$ + inc *yPos+1 +1$: +___move_metasprite_flipx_loop_writePosY: + sta _shadow_OAM+OAM_POS_Y,x + lda *yPos+1 + bne ___move_metasprite_flipx_outsideY + iny + lda [*___current_metasprite],y ; dx + eor #0xFF + bmi ___move_metasprite_flipx_dxNeg + sec + adc *xPos + sta *xPos + bcc 2$ + inc *xPos+1 +2$: +___move_metasprite_flipx_loop_writePosX: + sta _shadow_OAM+OAM_POS_X,x + lda *xPos+1 + bne ___move_metasprite_flipx_outsideX + iny + lda [*___current_metasprite],y ; tile index + iny + clc + adc *___current_base_tile + sta _shadow_OAM+OAM_TILE_INDEX,x + lda [*___current_metasprite],y ; props + eor #OAMF_XFLIP + adc *___current_base_prop + iny + sta _shadow_OAM+OAM_ATTRIBUTES,x + inx + inx + inx + inx + bne ___move_metasprite_flipx_loop +___move_metasprite_flipx_end: + jmp .move_metasprite_epilogue + +___move_metasprite_flipx_dxNeg: + sec + adc *xPos + sta *xPos + bcs 1$ + dec *xPos+1 +1$: + jmp ___move_metasprite_flipx_loop_writePosX + +___move_metasprite_flipx_dyNeg: + cmp #0x80 + beq ___move_metasprite_flipx_end + clc + adc *yPos + sta *yPos + bcs 1$ + dec *yPos+1 +1$: + jmp ___move_metasprite_flipx_loop_writePosY + +___move_metasprite_flipx_outsideY: + iny + lda [*___current_metasprite],y ; dx + eor #0xFF + bmi ___move_metasprite_flipx_outsideY_dxNeg + sec + adc *xPos + sta *xPos + bcc ___move_metasprite_flipx_outsideX + inc *xPos+1 +___move_metasprite_flipx_outsideX: + iny + ; Skip tile index / props + iny + iny + lda #0xF0 + sta _shadow_OAM+OAM_POS_Y,x + jmp ___move_metasprite_flipx_loop + +___move_metasprite_flipx_outsideY_dxNeg: + sec + adc *xPos + sta *xPos + bcs 1$ + dec *xPos+1 +1$: + jmp ___move_metasprite_flipx_outsideX diff --git a/gbdk-lib/libc/targets/mos6502/nes/metasprites_flipxy.s b/gbdk-lib/libc/targets/mos6502/nes/metasprites_flipxy.s @@ -0,0 +1,115 @@ + .include "global.s" + + .title "Metasprites" + .module Metasprites + + .area OSEG (PAG, OVR) + ___move_metasprite_hvflip_PARM_2:: + ___move_metasprite_flipxy_PARM_2:: .ds 2 + ___move_metasprite_hvflip_PARM_3:: + ___move_metasprite_flipxy_PARM_3:: .ds 2 + + .area _HOME + +.define xPos "___move_metasprite_flipxy_PARM_2" +.define yPos "___move_metasprite_flipxy_PARM_3" + +; uint8_t __move_metasprite_flipxy(uint8_t id, int16_t x, int16_t y) + +___move_metasprite_flipxy:: +___move_metasprite_hvflip:: + jsr .move_metasprite_prologue +___move_metasprite_flipxy_loop: + lda [*___current_metasprite],y ; dy + eor #0xFF + bpl ___move_metasprite_flipxy_dyNeg + sec + adc *yPos + sta *yPos + bcs 1$ + dec *yPos+1 +1$: +___move_metasprite_flipxy_loop_writePosY: + sta _shadow_OAM+OAM_POS_Y,x + lda *yPos+1 + bne ___move_metasprite_flipxy_outsideY + iny + lda [*___current_metasprite],y ; dx + eor #0xFF + bmi ___move_metasprite_flipxy_dxNeg + sec + adc *xPos + sta *xPos + bcc 2$ + inc *xPos+1 +2$: +___move_metasprite_flipxy_loop_writePosX: + sta _shadow_OAM+OAM_POS_X,x + lda *xPos+1 + bne ___move_metasprite_flipxy_outsideX + iny + lda [*___current_metasprite],y ; tile index + iny + clc + adc *___current_base_tile + sta _shadow_OAM+OAM_TILE_INDEX,x + lda [*___current_metasprite],y ; props + eor #OAMF_YFLIP+OAMF_XFLIP + adc *___current_base_prop + iny + sta _shadow_OAM+OAM_ATTRIBUTES,x + inx + inx + inx + inx + bne ___move_metasprite_flipxy_loop +___move_metasprite_flipxy_end: + jmp .move_metasprite_epilogue + +___move_metasprite_flipxy_dxNeg: + sec + adc *xPos + sta *xPos + bcs 1$ + dec *xPos+1 +1$: + jmp ___move_metasprite_flipxy_loop_writePosX + +___move_metasprite_flipxy_dyNeg: + cmp #0x7F + beq ___move_metasprite_flipxy_end + sec + adc *yPos + sta *yPos + bcc 1$ + inc *yPos+1 +1$: + jmp ___move_metasprite_flipxy_loop_writePosY + +___move_metasprite_flipxy_outsideY: + iny + lda [*___current_metasprite],y ; dx + eor #0xFF + bmi ___move_metasprite_flipxy_outsideY_dxNeg + sec + adc *xPos + sta *xPos + bcc ___move_metasprite_flipxy_outsideX + inc *xPos+1 +___move_metasprite_flipxy_outsideX: + iny + ; Skip tile index / props + iny + iny + lda #0xF0 + sta _shadow_OAM+OAM_POS_Y,x + jmp ___move_metasprite_flipxy_loop + +___move_metasprite_flipxy_outsideY_dxNeg: + sec + adc *xPos + sta *xPos + bcs 1$ + dec *xPos+1 +1$: + jmp ___move_metasprite_flipxy_outsideX diff --git a/gbdk-lib/libc/targets/mos6502/nes/metasprites_flipy.s b/gbdk-lib/libc/targets/mos6502/nes/metasprites_flipy.s @@ -0,0 +1,113 @@ + .include "global.s" + + .title "Metasprites" + .module Metasprites + + .area OSEG (PAG, OVR) + ___move_metasprite_hflip_PARM_2:: + ___move_metasprite_flipy_PARM_2:: .ds 2 + ___move_metasprite_hflip_PARM_3:: + ___move_metasprite_flipy_PARM_3:: .ds 2 + + .area _HOME + +.define xPos "___move_metasprite_flipy_PARM_2" +.define yPos "___move_metasprite_flipy_PARM_3" + +; uint8_t __move_metasprite_flipy(uint8_t id, int16_t x, int16_t y) + +___move_metasprite_flipy:: +___move_metasprite_hflip:: + jsr .move_metasprite_prologue +___move_metasprite_flipy_loop: + lda [*___current_metasprite],y ; dy + eor #0xFF + bpl ___move_metasprite_flipy_dyNeg + sec + adc *yPos + sta *yPos + bcs 1$ + dec *yPos+1 +1$: +___move_metasprite_flipy_loop_writePosY: + sta _shadow_OAM+OAM_POS_Y,x + lda *yPos+1 + bne ___move_metasprite_flipy_outsideY + iny + lda [*___current_metasprite],y ; dx + bmi ___move_metasprite_flipy_dxNeg + clc + adc *xPos + sta *xPos + bcc 2$ + inc *xPos+1 +2$: +___move_metasprite_flipy_loop_writePosX: + sta _shadow_OAM+OAM_POS_X,x + lda *xPos+1 + bne ___move_metasprite_flipy_outsideX + iny + lda [*___current_metasprite],y ; tile index + iny + clc + adc *___current_base_tile + sta _shadow_OAM+OAM_TILE_INDEX,x + lda [*___current_metasprite],y ; props + eor #OAMF_YFLIP + adc *___current_base_prop + iny + sta _shadow_OAM+OAM_ATTRIBUTES,x + inx + inx + inx + inx + bne ___move_metasprite_flipy_loop +___move_metasprite_flipy_end: + jmp .move_metasprite_epilogue + +___move_metasprite_flipy_dxNeg: + clc + adc *xPos + sta *xPos + bcs 1$ + dec *xPos+1 +1$: + jmp ___move_metasprite_flipy_loop_writePosX + +___move_metasprite_flipy_dyNeg: + cmp #0x7F + beq ___move_metasprite_flipy_end + sec + adc *yPos + sta *yPos + bcc 1$ + inc *yPos+1 +1$: + jmp ___move_metasprite_flipy_loop_writePosY + +___move_metasprite_flipy_outsideY: + iny + lda [*___current_metasprite],y ; dx + bmi ___move_metasprite_flipy_outsideY_dxNeg + clc + adc *xPos + sta *xPos + bcc ___move_metasprite_flipy_outsideX + inc *xPos+1 +___move_metasprite_flipy_outsideX: + iny + ; Skip tile index / props + iny + iny + lda #0xF0 + sta _shadow_OAM+OAM_POS_Y,x + jmp ___move_metasprite_flipy_loop + +___move_metasprite_flipy_outsideY_dxNeg: + clc + adc *xPos + sta *xPos + bcs 1$ + dec *xPos+1 +1$: + jmp ___move_metasprite_flipy_outsideX
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