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ReC98/th04/bgimage.asm

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[Reverse-engineering] [th04/th05] Music Room / ending background image buffers "bgimage" really was the best name I could come up with here, given what it's used for. Everything else sounded way too ambiguous. Even something like "mempage", in the meaning of "a third memory-backed graphics page"… --Nmlgc
2019-12-08 12:09:13 +00:00
public BGIMAGE_SNAP
bgimage_snap proc far
push si
push di
cmp bgimage_PL_B, 0
jnz short @@already_allocated
[Maintenance] Use @@locals for self-modifying code in bfnt_entry_pat() Which finally allows us to use the PLANE_SIZE macro in ASM land. Yeah, (ROW_SIZE * RES_Y) has finally got old. Part of P0073, funded by [Anonymous] and -Tom-.
2020-02-05 21:45:59 +00:00
call hmem_allocbyte pascal, PLANE_SIZE
[Reverse-engineering] [th04/th05] Music Room / ending background image buffers "bgimage" really was the best name I could come up with here, given what it's used for. Everything else sounded way too ambiguous. Even something like "mempage", in the meaning of "a third memory-backed graphics page"… --Nmlgc
2019-12-08 12:09:13 +00:00
mov bgimage_PL_B, ax
[Maintenance] Use @@locals for self-modifying code in bfnt_entry_pat() Which finally allows us to use the PLANE_SIZE macro in ASM land. Yeah, (ROW_SIZE * RES_Y) has finally got old. Part of P0073, funded by [Anonymous] and -Tom-.
2020-02-05 21:45:59 +00:00
call hmem_allocbyte pascal, PLANE_SIZE
[Reverse-engineering] [th04/th05] Music Room / ending background image buffers "bgimage" really was the best name I could come up with here, given what it's used for. Everything else sounded way too ambiguous. Even something like "mempage", in the meaning of "a third memory-backed graphics page"… --Nmlgc
2019-12-08 12:09:13 +00:00
mov bgimage_PL_R, ax
[Maintenance] Use @@locals for self-modifying code in bfnt_entry_pat() Which finally allows us to use the PLANE_SIZE macro in ASM land. Yeah, (ROW_SIZE * RES_Y) has finally got old. Part of P0073, funded by [Anonymous] and -Tom-.
2020-02-05 21:45:59 +00:00
call hmem_allocbyte pascal, PLANE_SIZE
[Reverse-engineering] [th04/th05] Music Room / ending background image buffers "bgimage" really was the best name I could come up with here, given what it's used for. Everything else sounded way too ambiguous. Even something like "mempage", in the meaning of "a third memory-backed graphics page"… --Nmlgc
2019-12-08 12:09:13 +00:00
mov bgimage_PL_G, ax
[Maintenance] Use @@locals for self-modifying code in bfnt_entry_pat() Which finally allows us to use the PLANE_SIZE macro in ASM land. Yeah, (ROW_SIZE * RES_Y) has finally got old. Part of P0073, funded by [Anonymous] and -Tom-.
2020-02-05 21:45:59 +00:00
call hmem_allocbyte pascal, PLANE_SIZE
[Reverse-engineering] [th04/th05] Music Room / ending background image buffers "bgimage" really was the best name I could come up with here, given what it's used for. Everything else sounded way too ambiguous. Even something like "mempage", in the meaning of "a third memory-backed graphics page"… --Nmlgc
2019-12-08 12:09:13 +00:00
mov bgimage_PL_E, ax
@@already_allocated:
mov dl, 4
push ds
push 0E000h
push bgimage_PL_E
push 0B800h
push bgimage_PL_G
push 0B000h
push bgimage_PL_R
push 0A800h
push bgimage_PL_B
@@next_plane:
pop es
pop ds
xor si, si
xor di, di
[Maintenance] Use @@locals for self-modifying code in bfnt_entry_pat() Which finally allows us to use the PLANE_SIZE macro in ASM land. Yeah, (ROW_SIZE * RES_Y) has finally got old. Part of P0073, funded by [Anonymous] and -Tom-.
2020-02-05 21:45:59 +00:00
mov cx, (PLANE_SIZE / 4)
[Reverse-engineering] [th04/th05] Music Room / ending background image buffers "bgimage" really was the best name I could come up with here, given what it's used for. Everything else sounded way too ambiguous. Even something like "mempage", in the meaning of "a third memory-backed graphics page"… --Nmlgc
2019-12-08 12:09:13 +00:00
rep movsd
dec dl
jnz short @@next_plane
pop ds
pop di
pop si
retf
bgimage_snap endp
public BGIMAGE_PUT
bgimage_put proc far
push si
push di
mov dl, 4
push ds
push 0E000h
push bgimage_PL_E
push 0B800h
push bgimage_PL_G
push 0B000h
push bgimage_PL_R
push 0A800h
push bgimage_PL_B
@@next_plane:
pop ds
pop es
xor si, si
xor di, di
[Maintenance] Use @@locals for self-modifying code in bfnt_entry_pat() Which finally allows us to use the PLANE_SIZE macro in ASM land. Yeah, (ROW_SIZE * RES_Y) has finally got old. Part of P0073, funded by [Anonymous] and -Tom-.
2020-02-05 21:45:59 +00:00
mov cx, (PLANE_SIZE / 4)
[Reverse-engineering] [th04/th05] Music Room / ending background image buffers "bgimage" really was the best name I could come up with here, given what it's used for. Everything else sounded way too ambiguous. Even something like "mempage", in the meaning of "a third memory-backed graphics page"… --Nmlgc
2019-12-08 12:09:13 +00:00
rep movsd
dec dl
jnz short @@next_plane
pop ds
pop di
pop si
retf
bgimage_put endp
even
public BGIMAGE_FREE
bgimage_free proc far
cmp bgimage_PL_B, 0
jz short @@ret
call hmem_free pascal, bgimage_PL_B
call hmem_free pascal, bgimage_PL_R
call hmem_free pascal, bgimage_PL_G
call hmem_free pascal, bgimage_PL_E
mov bgimage_PL_B, 0
@@ret:
retf
bgimage_free endp