mirror of
https://github.com/notwa/mm
synced 2024-11-05 04:39:03 -08:00
199 lines
5.1 KiB
NASM
199 lines
5.1 KiB
NASM
/*
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.org 0x18F30
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; add an entry to the end of dmatable to hold our extra code
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; this actually just crashes the game so don't bother
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; (no debug filename associated with it = bad pointer dereference? maybe?)
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.word @vstart ; virtual start
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.word 0x035E0000 ; virtual end (@vstart + @size)
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.word @vstart ; physical start (should be same as virtual start)
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.word 0 ; physical end (should be 0 for uncompressed)
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*/
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start:
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push 4, 1, ra
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; time for dlist misuse
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; TODO: check if the game has even loaded yet
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li t0, @dlists
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jal adjust_dlist
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lw a0, 4(t0) ; HUD display list start
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jpop 4, 1, ra
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adjust_dlist:
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; args: pointer to start of dlist
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push 4, s0, s1, s2, s3, s4, s5, s6, s7, s8, ra
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cl s7 ; iteration count
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mov s8, a0
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-:
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bgei s7, 0x1000, +return ; give up after a while
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addiu s7, s7, 1
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lw t1, 0(s8) ; load a command
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li t9, 0xDF000000
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beq t1, t9, +return ; stop if we're at the end of the display list
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li t9, 0xDE010000
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beq t1, t9, +return ; jumps count as ends too
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li t9, 0xDC080008
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beq t1, t9, screen_dim ; check if these are screen dimensions
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li t9, 0xFF000000
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and t3, t1, t9
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li t9, 0xE4000000
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beq t3, t9, texscale ; check if this is a 2D texture
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li t9, 0xED000000
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beq t3, t9, setscissor ; check if... yeah
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li t9, 0xDE000000
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beq t3, t9, recurse ; check if this is a "call" and recurse into it
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nop
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next:
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b -
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addiu s8, s8, 8 ; next command
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; FIXME:
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; don't recurse into the pause menu background
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; jiggle jiggle
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recurse:
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lw a0, 4(s8)
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li t9, 0xFF000000
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and t3, a0, t9
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li t9, 0x80000000
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; only follow this if it's a pointer (not a bank offset!)
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bne t3, t9, next
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nop
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sw a0, debug
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jal adjust_dlist
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nop
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b next
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nop
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texscale:
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addiu s8, s8, 8 ; next command
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; get the coordinate and scale data
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andi s1, t1, 0xFFF ; get bottom right y
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srl t3, t1, 12
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andi s0, t3, 0xFFF ; get bottom right x
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lw t1, -4(s8) ; load second word of E4 command
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andi s3, t1, 0xFFF ; get top right y
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srl t3, t1, 12
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andi s2, t3, 0xFFF ; get top right x
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lw t1, 0xC(s8) ; load second word of F1 command
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; (last word of E4 command chain)
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andi s5, t1, 0xFFFF ; get y scale
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srl t3, t1, 16
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andi s4, t3, 0xFFFF ; get x scale
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; scale coordinates
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jal scale_xy
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mov a0, s0
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mov s0, v0
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jal scale_xy
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mov a0, s2
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mov s2, v0
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; scale pixel steps
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jal scale_step
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mov a0, s4
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mov s4, v0
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; reconstruct commands
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li t9, 0xE4000000
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sll t3, s0, 12
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or t1, t9, s1
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or t1, t1, t3
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sw t1, -8(s8)
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;
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lw t1, -4(s8)
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srl t1, t1, 24 ; clear the lower 3 bytes
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sll t1, t1, 24
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sll t3, s2, 12
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or t1, t3, s3
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or t1, t1, t3
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sw t1, -4(s8)
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;
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sll t1, s4, 16
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or t1, t1, s5
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sw t1, 0xC(s8)
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b -
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addiu s8, s8, 0x10 ; next two commands
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screen_dim: ; handle screen dimensions for A Button, beating heart, map icons
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lw t1, 4(s8)
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lw t4, 0(t1)
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li t9, 0x005A005A ; probably the A button, we want it to be 0x0044
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beq t4, t9, abutt
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li t9, 0x028001E0 ; general screen stuff
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; FIXME: this causes the "jiggling" effect.
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; we need to be more picky about which structs we modify.
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beq t4, t9, general
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nop
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; sw t4, debug
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b next
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nop
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abutt:
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li t9, 0x0044005A
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sw t9, 0(t1)
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li t9, 0x0312007E
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sw t9, 8(t1)
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b next
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nop
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general:
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li t9, 0x01E001E0
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b next
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sw t9, 0(t1)
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setscissor:
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lw t1, 0(s8)
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lw t3, 4(s8)
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; change setscissor of A Button
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; from ED2E8024 0039C0D8
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; to ED2B8024 0036C0D8
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; TODO: just calculate this dynamically
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li t9, 0xED2E8024
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bne t1, t9, next
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li t9, 0xED2B8024
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sw t9, 0(s8)
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li t9, 0x0039C0D8
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b next
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sw t9, 4(s8)
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;8008A8F8 sets up a button/text matrix?
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; call at 8008B684 sets up matrix/viewport for A button
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; 80168938 end of HUD dlist
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;802114C4
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;80167FB0
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+return:
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jpop 4, s0, s1, s2, s3, s4, s5, s6, s7, s8, ra
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.align 4
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.word 0xDEADBEEF
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debug:
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.word 0
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.word 0
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.word 0xDEADBEEF
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scale_xy:
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li at, 0x3F400000 ; 0.75f
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mtc1 a0, f30 ; note: we blindly assume f30 is fine to overwrite here
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mtc1 at, f31 ; likewise
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cvt.s.w f30, f30
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mul.s f30, f30, f31
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nop
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trunc.w.s f31, f30
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mfc1 v0, f31
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; TODO: add before truncation? (proper rounding etc.)
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addiu v0, v0, 0xA0 ; round((((240 * 16 / 9. - 320) / 2.) * 0.75) * 4)
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jr
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andi v0, v0, 0xFFF
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scale_step:
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li at, 0x3FAAAAAB ; 1.3333334f
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mtc1 a0, f30 ; note: we blindly assume f30 is fine to overwrite here
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mtc1 at, f31 ; likewise
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cvt.s.w f30, f30
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mul.s f30, f30, f31
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nop
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trunc.w.s f31, f30
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mfc1 v0, f31
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jr
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andi v0, v0, 0xFFFF
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