first commit

.gitignore

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+*.smc
+*.sfc
+
+asar.exe

build.py

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+#!/usr/bin/env python3
+
+import os
+import sys
+import shutil
+from subprocess import call
+
+c = call
+
+original = "smw.sfc"
+out_dir = "patched"
+out_file = "smw_segment.sfc"
+
+
+def main():
+    if os.path.exists(out_dir):
+        shutil.rmtree(out_dir)
+        print("Cleaning output directory.")
+    os.mkdir(out_dir)
+    shutil.copy(original, out_dir + "/" + out_file)
+    c("asar src/main.asm patched/smw_segment.sfc".split())
+    print("Assembling finished.")
+
+
+main()
+sys.exit()

src/data/overworld_table.asm

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+include
+
+overworld_submap_table:
+    db $01 ; yoshi's island
+    db $00 ; donut plains
+    db $02 ; vanila dome
+    db $00 ; cheese bridge
+    db $06 ; star world
+    db $05 ; special
+    db $01 ; yoshi island (post special)
+    db $03 ; forest of illusion
+    db $00 ; chocolate island
+    db $00 ; sunken ghost ship
+
+overworld_pos_x_table:
+    dw $0068
+    dw $0058
+    dw $0058
+    dw $0118
+    dw $0178
+    dw $0118
+    dw $0068
+    dw $0088
+    dw $0188
+    dw $00E8
+
+overworld_pos_y_table:
+    dw $0278
+    dw $0118
+    dw $0328
+    dw $0078
+    dw $0368
+    dw $0338
+    dw $0278
+    dw $0378
+    dw $0168
+    dw $0178

src/defines.asm

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+include
+
+; controller
+!mario_byetudlr_hold = $0015
+!mario_byetudlr_frame = $0016
+!mario_axlr_hold = $0017
+!mario_axlr_frame = $0018
+!util_byetudlr_hold = $0DA2
+!util_byetudlr_frame = $0DA6
+!util_axlr_hold = $0DA4
+!util_axlr_frame = $0DA8
+
+; stripe image
+!stripe_index    = $7F837B
+!stripe_image    = $7F837D
+
+; overworld
+!submap_id = $13C3
+!overworld_pos_x = $1F17
+!overworld_pos_y = $1F19
+
+; freeram
+!freeram = $0695 ; cleared on reset and titlescreen load
+
+; test
+!test_gm0e = !freeram
+
+; overworld warp
+!warp_index = !freeram+1

src/hijacks.asm

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+include
+
+; overworld
+org $00A165
+    jsl gamemode_0e_hijack

src/main.asm

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+; internal ROM name
+org $00FFC0
+    db "SMW SEGMENT     "
+
+incsrc "defines.asm"
+incsrc "hijacks.asm"
+incsrc "overworld.asm" ; $108000
+
+org $1FFFFF
+    db $EA

src/overworld.asm

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+include
+
+org $108000
+gamemode_0e_hijack:
+        jsl $048241
+        ; jsr test_gm0e
+        jsr test_warp
+        rtl
+
+test_gm0e:
+        inc !test_gm0e
+        rts
+
+test_warp:
+        lda !util_byetudlr_hold
+        and #%00110000
+        cmp #%00110000
+        beq update_player_position
+        rts
+
+update_player_position:
+        ldx !warp_index
+        lda.l overworld_submap_table,x
+        sta !submap_id
+        sta $1f11
+        rep #$20
+        txa
+        asl
+        tax
+        lda.l overworld_pos_x_table,x
+        and #$01FF
+        sta !overworld_pos_x
+        lsr #4
+        sta $1F1F
+        lda.l overworld_pos_y_table,x
+        and #$01FF
+        sta !overworld_pos_y
+        lsr #4
+        sta $1F21
+        sep #$20
+        stz $0DD5
+        lda #$0B
+        sta $0100
+        rts 
+
+incsrc "data/overworld_table.asm"
+
+print "[src/overworld.asm]: ", pc, "/109000 inserted"