git.y1.nz

commit bbf636cadb7c30dbf110393b0c8962428eb40186
parent 4abe9ca5a2d8ddac34d270de27545d95a88c0afb
Author: Toxa <untoxa@mail.ru>
Date:   Fri, 27 Aug 2021 14:15:57 +0300

SMS/GG: set_vram_byte(), set_tile_xy(), set_attributed_tile_xy()

Diffstat:
M
gbdk-lib/include/gb/gb.h
2
+-
M
gbdk-lib/include/sms/sms.h
27
+++++++++++++++++++++++++++
M
gbdk-lib/libc/targets/z80/gg/Makefile
1
+
A
gbdk-lib/libc/targets/z80/set_tile.s
94
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
M
gbdk-lib/libc/targets/z80/set_tile_map.s
3
+++
M
gbdk-lib/libc/targets/z80/set_tile_map_compat.s
3
+++
M
gbdk-lib/libc/targets/z80/sms/Makefile
1
+

7 files changed, 130 insertions(+), 1 deletion(-)
diff --git a/gbdk-lib/include/gb/gb.h b/gbdk-lib/include/gb/gb.h
@@ -914,7 +914,7 @@ void get_bkg_tiles(uint8_t x,
  * @return returns the address of tile, so you may use faster set_vram_byte() later
  */ 
 uint8_t * set_bkg_tile_xy(uint8_t x, uint8_t y, uint8_t t) __preserves_regs(b, c);
-
+#define set_tile_xy set_bkg_tile_xy
 
 /**
  * Get single tile t on background layer at x,y
diff --git a/gbdk-lib/include/sms/sms.h b/gbdk-lib/include/sms/sms.h
@@ -511,5 +511,32 @@ inline void hide_sprite(uint8_t nb) {
     shadow_OAM[nb] = 0xC0;
 }
 
+/**
+ * Set byte in vram at given memory location
+ * 
+ * @param addr address to write to
+ * @param v value
+ */
+void set_vram_byte(uint8_t * addr, uint8_t v) __z88dk_callee __preserves_regs(iyh, iyl);
+
+/**
+ * Set single tile t with attributes on background layer at x,y
+ * @param x X-coordinate
+ * @param y Y-coordinate
+ * @param t tile index
+ * @return returns the address of tile, so you may use faster set_vram_byte() later
+ */ 
+uint8_t * set_attributed_tile_xy(uint8_t x, uint8_t y, uint16_t t) __z88dk_callee __preserves_regs(iyh, iyl);
+
+/**
+ * Set single tile t on background layer at x,y
+ * @param x X-coordinate
+ * @param y Y-coordinate
+ * @param t tile index
+ * @return returns the address of tile, so you may use faster set_vram_byte() later
+ */ 
+uint8_t * set_tile_xy(uint8_t x, uint8_t y, uint8_t t) __z88dk_callee __preserves_regs(iyh, iyl);
+#define set_bkg_tile_xy set_tile_xy
+#define set_win_tile_xy set_tile_xy
 
 #endif /* _SMS_H */
diff --git a/gbdk-lib/libc/targets/z80/gg/Makefile b/gbdk-lib/libc/targets/z80/gg/Makefile
@@ -11,6 +11,7 @@ ASSRC =	outi.s vmemcpy.s \
 	set_data.s set_2bpp_data.s \
 	set_tile_map.s set_tile_map_xy.s set_tile_map_compat.s set_tile_map_xy_compat.s \
 	set_tile_submap.s set_tile_submap_compat.s \
+	set_tile.s \
 	fill_rect.s fill_rect_xy.s fill_rect_compat.s fill_rect_xy_compat.s \
 	metasprites.s metasprites_hide.s metasprites_hide_spr.s \
 	f_ibm_full.s f_ibm_sh.s f_italic.s f_min.s f_spect.s \
diff --git a/gbdk-lib/libc/targets/z80/set_tile.s b/gbdk-lib/libc/targets/z80/set_tile.s
@@ -0,0 +1,94 @@
+        .include        "global.s"
+
+        .area   _HOME
+
+; void set_vram_byte(uint8_t * addr, uint8_t v) __z88dk_callee __preserves_regs(iyh, iyl);
+_set_vram_byte::
+        pop de
+        pop hl
+        DISABLE_VBLANK_COPY
+        WRITE_VDP_CMD_HL
+        ex de, hl
+        dec sp
+        ex (sp), hl
+        ld a, h
+        out (.VDP_DATA), a
+        ENABLE_VBLANK_COPY
+        ret
+
+; translate coords in DE and given base in BC into address in DE
+.coords_to_address:
+        add #.SCREEN_Y_OFS
+        ld d, a
+        xor a
+        FAST_MOD8 d #28
+        ld d, a
+
+        ld a, e
+        add #.SCREEN_X_OFS
+        and #0x1f
+        ld e, a         
+
+        ld a, d
+        rrca                    ; rrca(2) == rlca(6)
+        rrca 
+        ld d, a
+        and #0x07
+        add b
+        ld b, a
+        ld a, #0xC0
+        and d
+        sla e
+        add e
+        ld e, a
+        ld d, b                 ; dest DE = BC + ((0x20 * Y) * 2) + (X * 2)
+
+        ret
+
+; uint8_t * set_attributed_tile_xy(uint8_t x, uint8_t y, uint16_t t) __z88dk_callee __preserves_regs(iyh, iyl);
+_set_attributed_tile_xy::
+        pop hl          ; HL = ret
+        pop de          ; DE = YX
+        ex (sp), hl     ; HL = data
+
+        ld a, d
+
+        ld bc, #.VDP_TILEMAP
+        call .coords_to_address
+        ex de, hl
+
+        DISABLE_VBLANK_COPY
+        WRITE_VDP_CMD_HL
+
+        ld c, #.VDP_DATA
+        out (c), e
+        VDP_DELAY
+        out (c), d
+
+        ENABLE_VBLANK_COPY
+        ret
+
+; uint8_t * set_tile_xy(uint8_t x, uint8_t y, uint8_t t) __z88dk_callee __preserves_regs(iyh, iyl);
+_set_tile_xy::
+        pop hl          ; HL = ret
+        pop de          ; DE = YX
+        dec sp
+        ex (sp), hl     ; HL = data
+
+        ld a, d
+
+        ld bc, #.VDP_TILEMAP
+        call .coords_to_address
+        ex de, hl
+
+        ld a, (.vdp_shift)
+        ADD_A_REG16 h, l
+
+        DISABLE_VBLANK_COPY
+        WRITE_VDP_CMD_HL
+
+        ld a, d
+        out (.VDP_DATA), a
+
+        ENABLE_VBLANK_COPY
+        ret
diff --git a/gbdk-lib/libc/targets/z80/set_tile_map.s b/gbdk-lib/libc/targets/z80/set_tile_map.s
@@ -1,5 +1,8 @@
         .include        "global.s"
 
+        .title  "VRAM utilities"
+        .module VRAMUtils
+
         .globl  .set_tile_map_xy
 
         .area   _HOME
diff --git a/gbdk-lib/libc/targets/z80/set_tile_map_compat.s b/gbdk-lib/libc/targets/z80/set_tile_map_compat.s
@@ -1,5 +1,8 @@
         .include        "global.s"
 
+        .title  "VRAM utilities"
+        .module VRAMUtils
+
         .globl  .set_tile_map_xy
 
         .area   _HOME
diff --git a/gbdk-lib/libc/targets/z80/sms/Makefile b/gbdk-lib/libc/targets/z80/sms/Makefile
@@ -11,6 +11,7 @@ ASSRC =	outi.s vmemcpy.s \
 	set_data.s set_2bpp_data.s \
 	set_tile_map.s set_tile_map_xy.s set_tile_map_compat.s set_tile_map_xy_compat.s \
 	set_tile_submap.s set_tile_submap_compat.s \
+	set_tile.s \
 	fill_rect.s fill_rect_xy.s fill_rect_compat.s fill_rect_xy_compat.s \
 	metasprites.s metasprites_hide.s metasprites_hide_spr.s \
 	f_ibm_full.s f_ibm_sh.s f_italic.s f_min.s f_spect.s \

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