mirror of https://github.com/nmlgc/ReC98.git
[Reverse-engineering] [th04/th05] .BB tile animation: Filling a single tile
Sure, it's still a micro-optimization, but at least it's __fastcall for
once! And doesn't assume ES to have been set to a VRAM segment. So not
*that* optimized 😛
Part of P0147, funded by -Tom- and Ember2528.
This commit is contained in:
nmlgc
parent
ebbb5b8255
commit
f3afd37e8f
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@ -0,0 +1,3 @@
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// Fills the playfield tile starting at (⌊left/8⌋*8, top) with the current
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// GRCG tile. Assumes that the GRCG is set to TDW mode.
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void fastcall near grcg_tile_bb_put_8(screen_x_t left, vram_y_t top);
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@ -0,0 +1,46 @@
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public @grcg_tile_bb_put_8
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@grcg_tile_bb_put_8 proc near
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@@left equ <ax>
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@@top equ <dx>
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@@rows_after_roll equ <bx>
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push di
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mov @@rows_after_roll, @@top
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sar @@left, 3
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shl @@top, 6
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add @@left, @@top
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shr @@top, 2
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add @@left, @@top
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mov di, @@left
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mov ax, GRAM_400
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mov es, ax
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assume es:nothing
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cmp bx, PLAYFIELD_BOTTOM
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ja short @@roll_needed
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mov cx, TILE_H
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xor @@rows_after_roll, @@rows_after_roll
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jmp short @@row_loop
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; ---------------------------------------------------------------------------
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@@roll_needed:
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mov cx, RES_Y
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sub cx, @@rows_after_roll
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mov @@rows_after_roll, TILE_H
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sub @@rows_after_roll, cx
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@@row_loop:
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stosw
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add di, (ROW_SIZE - TILE_VRAM_W)
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loop @@row_loop
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or @@rows_after_roll, @@rows_after_roll
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jz short @@ret
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sub di, PLANE_SIZE
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xchg cx, @@rows_after_roll
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jmp short @@row_loop
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; ---------------------------------------------------------------------------
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@@ret:
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pop di
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retn
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@grcg_tile_bb_put_8 endp
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@ -1740,7 +1740,7 @@ loc_BF48:
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sub dx, RES_Y
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loc_BF62:
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call main_01:sub_11FC8
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call @grcg_tile_bb_put_8
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loc_BF65:
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shl [bp+var_1], 1
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@ -10879,51 +10879,7 @@ sub_11ECB endp
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include th03/formats/cfg_lres.asm
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db 0
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; =============== S U B R O U T I N E =======================================
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sub_11FC8 proc near
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push di
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mov bx, dx
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sar ax, 3
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shl dx, 6
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add ax, dx
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shr dx, 2
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add ax, dx
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mov di, ax
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mov ax, GRAM_400
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mov es, ax
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assume es:nothing
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cmp bx, PLAYFIELD_BOTTOM
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ja short loc_11FEC
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mov cx, TILE_H
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xor bx, bx
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jmp short loc_11FF6
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; ---------------------------------------------------------------------------
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loc_11FEC:
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mov cx, RES_Y
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sub cx, bx
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mov bx, TILE_H
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sub bx, cx
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loc_11FF6:
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stosw
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add di, (ROW_SIZE - word)
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loop loc_11FF6
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or bx, bx
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jz short loc_12008
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sub di, PLANE_SIZE
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xchg cx, bx
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jmp short loc_11FF6
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; ---------------------------------------------------------------------------
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loc_12008:
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pop di
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retn
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sub_11FC8 endp
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include th04/main/tile/bb_put.asm
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; =============== S U B R O U T I N E =======================================
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@ -2867,51 +2867,7 @@ bomb_yuuka endp
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db 0
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include th05/formats/bb_playchar.asm
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; =============== S U B R O U T I N E =======================================
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sub_CE80 proc near
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push di
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mov bx, dx
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sar ax, 3
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shl dx, 6
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add ax, dx
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shr dx, 2
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add ax, dx
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mov di, ax
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mov ax, GRAM_400
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mov es, ax
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assume es:nothing
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cmp bx, PLAYFIELD_BOTTOM
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ja short loc_CEA4
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mov cx, TILE_H
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xor bx, bx
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jmp short loc_CEAE
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; ---------------------------------------------------------------------------
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loc_CEA4:
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mov cx, RES_Y
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sub cx, bx
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mov bx, TILE_H
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sub bx, cx
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loc_CEAE:
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stosw
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add di, (ROW_SIZE - word)
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loop loc_CEAE
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or bx, bx
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jz short loc_CEC0
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sub di, PLANE_SIZE
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xchg cx, bx
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jmp short loc_CEAE
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; ---------------------------------------------------------------------------
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loc_CEC0:
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pop di
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retn
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sub_CE80 endp
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include th04/main/tile/bb_put.asm
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; =============== S U B R O U T I N E =======================================
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@ -3962,7 +3918,7 @@ loc_DF7F:
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sub dx, RES_Y
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loc_DF89:
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call sub_CE80
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call @grcg_tile_bb_put_8
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loc_DF8C:
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shl [bp+var_1], 1
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