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ReC98/th03/formats/cdg_put_noalpha.asm

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[Maintenance] Declare distinct types for screen, VRAM, and TRAM coordinates Whew, time to look at every `int` variable we ever declared! The best moment to do this would have been a year ago, but well, better late than never. No need to communicate that in comments anymore. These shouldn't be used for widths, heights, or sprite-space coordinates. Maybe we'll cover that another time, this commit is already large enough. Part of P0111, funded by [Anonymous] and Blue Bolt.
2020-08-20 19:59:45 +00:00
; Displays the CDG image in the given [slot] at (⌊left/8⌋*8, top),
; disregarding its alpha plane.
[Reverse-engineering] [th03] Non-alpha CDG display
2017-01-14 12:24:49 +00:00
[Maintenance] Declare distinct types for screen, VRAM, and TRAM coordinates Whew, time to look at every `int` variable we ever declared! The best moment to do this would have been a year ago, but well, better late than never. No need to communicate that in comments anymore. These shouldn't be used for widths, heights, or sprite-space coordinates. Maybe we'll cover that another time, this commit is already large enough. Part of P0111, funded by [Anonymous] and Blue Bolt.
2020-08-20 19:59:45 +00:00
; void pascal cdg_put_noalpha(screen_x_t left, vram_y_t top, int slot);
[Maintenance] Export all pascal functions with their proper uppercase names Yup, that was one massive screw-up. Part of P0030, funded by zorg.
2019-09-15 16:23:33 +00:00
public CDG_PUT_NOALPHA
[Maintenance] Fix the function name format of CDG/CD2 functions No leading underscore for functions with Pascal calling convention, but we do have one for all variables, because it's not worth it to put keywords in front of everything for no reason. Seemed to have forgotten this rule in 2017? Part of P0030, funded by zorg.
2019-09-15 14:22:36 +00:00
cdg_put_noalpha proc far
[Reverse-engineering] [th03] Non-alpha CDG display
2017-01-14 12:24:49 +00:00
@@slot = word ptr 6
[Maintenance] Declare distinct types for screen, VRAM, and TRAM coordinates Whew, time to look at every `int` variable we ever declared! The best moment to do this would have been a year ago, but well, better late than never. No need to communicate that in comments anymore. These shouldn't be used for widths, heights, or sprite-space coordinates. Maybe we'll cover that another time, this commit is already large enough. Part of P0111, funded by [Anonymous] and Blue Bolt.
2020-08-20 19:59:45 +00:00
@@top = word ptr 8
@@left = word ptr 10
[Reverse-engineering] [th03] Non-alpha CDG display
2017-01-14 12:24:49 +00:00
push bp
mov bp, sp
push si
push di
mov si, [bp+@@slot]
shl si, 4
add si, offset _cdg_slots
[Maintenance] Declare distinct types for screen, VRAM, and TRAM coordinates Whew, time to look at every `int` variable we ever declared! The best moment to do this would have been a year ago, but well, better late than never. No need to communicate that in comments anymore. These shouldn't be used for widths, heights, or sprite-space coordinates. Maybe we'll cover that another time, this commit is already large enough. Part of P0111, funded by [Anonymous] and Blue Bolt.
2020-08-20 19:59:45 +00:00
mov ax, [bp+@@left]
[Reverse-engineering] [th03] Non-alpha CDG display
2017-01-14 12:24:49 +00:00
sar ax, 3
[Maintenance] [th03/th04/th05] Declare the CDG slot structure in C land Third iteration on the field names, now consistent with how the naming has evolved since 2017… Part of P0113, funded by Lmocinemod.
2020-09-05 14:09:18 +00:00
add ax, [si+cdg_t.offset_at_bottom_left]
[Reverse-engineering] [th03] Non-alpha CDG display
2017-01-14 12:24:49 +00:00
mov di, ax
[Maintenance] [th03/th04/th05] Declare the CDG slot structure in C land Third iteration on the field names, now consistent with how the naming has evolved since 2017… Part of P0113, funded by Lmocinemod.
2020-09-05 14:09:18 +00:00
mov ax, [si+cdg_t.vram_dword_w]
[Reverse-engineering] [th03] Non-alpha CDG display
2017-01-14 12:24:49 +00:00
mov word ptr cs:@@width+1, ax
jmp short $+2
shl ax, 2
add ax, (640 / 8)
mov dx, ax
[Maintenance] Declare distinct types for screen, VRAM, and TRAM coordinates Whew, time to look at every `int` variable we ever declared! The best moment to do this would have been a year ago, but well, better late than never. No need to communicate that in comments anymore. These shouldn't be used for widths, heights, or sprite-space coordinates. Maybe we'll cover that another time, this commit is already large enough. Part of P0111, funded by [Anonymous] and Blue Bolt.
2020-08-20 19:59:45 +00:00
mov ax, [bp+@@top]
[Reverse-engineering] [th03] Non-alpha CDG display
2017-01-14 12:24:49 +00:00
mov bx, ax
shl ax, 2
add ax, bx
add ax, 0A800h
mov es, ax
push ds
[Maintenance] [th03/th04/th05] Declare the CDG slot structure in C land Third iteration on the field names, now consistent with how the naming has evolved since 2017… Part of P0113, funded by Lmocinemod.
2020-09-05 14:09:18 +00:00
mov ax, [si+cdg_t.seg_colors]
[Reverse-engineering] [th03] Non-alpha CDG display
2017-01-14 12:24:49 +00:00
mov ds, ax
xor si, si
mov bx, di
cld
nop
@@width:
mov cx, 1234h
rep movsd
sub di, dx
jns short @@width
mov di, bx
mov ax, es
add ax, 800h
mov es, ax
assume es:nothing
cmp ax, 0C000h
jb short @@width
cmp ax, 0C800h
jnb short @@ret
add ax, 2000h
mov es, ax
assume es:nothing
jmp short @@width
@@ret:
pop ds
pop di
pop si
pop bp
retf 6
[Maintenance] Fix the function name format of CDG/CD2 functions No leading underscore for functions with Pascal calling convention, but we do have one for all variables, because it's not worth it to put keywords in front of everything for no reason. Seemed to have forgotten this rule in 2017? Part of P0030, funded by zorg.
2019-09-15 14:22:36 +00:00
cdg_put_noalpha endp
[Reverse-engineering] [th03] Non-alpha CDG display
2017-01-14 12:24:49 +00:00
align 2