add really rough onscreen printing

Lua/inject.lua

@@ -26,8 +26,13 @@ local injection_points = {
     ['O EUDB MQ'] = {
         inject_addr = 0x700000,
         inject_maxlen = 0x100000,
-        ow_addr = 0x0C6940,
-        ow_before = 0x0C03151F,
+        -- main rendering loop:
+        -- the only other function (that literally just loads and returns)
+        --ow_addr = 0x0C6940,
+        --ow_before = 0x0C03151F,
+        -- first (high-level) function after iterating over actors
+        ow_addr = 0x0C62B8,
+        ow_before = 0x0C031AB1,
     },
 }
 injection_points['O JP10'] = injection_points['O US10']

Lua/inject/print.asm

@@ -2,16 +2,104 @@
 // to copy strings to memory instead
 // for Lua to later pick up on
 
+[global_context]: 0x80212020
+
+// offset from first pointer in global context
+[dlist_offset]: 0x2C0
+
+[SetTextRGBA]:      0x800FB3AC
+[SetTextXY]:        0x800FB41C
+[SetTextString]:    0x800FBCB4
+[TxtPrinter]:       0x800FBB60
+[InitTxtStruct]:    0x800FBB8C
+[DoTxtStruct]:      0x800FBC1C
+[UpdateTxtStruct]:  0x800FBC64
+
+[ObjectSpawn]: 0x80097C00
+[ObjectIndex]: 0x8009812C
+
+    push    4, 1, ra
+// draw some nonsense text
+    li      a0, 0x00010001 // xy
+    li      a1, 0x88CCFFFF // rgba
+    la      a2, fmt
+    la      a3, buffer
+    jal     easytext
+    nop
 // reset buffer position in our per-frame hook
     la      t0, buffer
     sw      t0, buffer_pos
 // and set the string to null
     sb      r0, 0(t0)
-    jr
+    jpop    4, 1, ra
+
+fmt:
+    .byte 0x25,0x73,0x00 // %s
+.align
+str:
+    .byte 0x68,0x65,0x79,0x00 // hey
+.align
+
+textdata:
+    .word 0, 0, 0, 0, 0
+easytext:
+    // a0: xxxxyyyy
+    // a1: rrggbbaa
+    // a2: printf formatting string
+    // a3: first argument for format string (optional)
+    // TODO: support more than 4 args
+    push    4, 1, s0, s1, ra
+
+    la      s0, textdata
+
+    sw      a0, 32(sp)
+    sw      a1, 36(sp)
+    sw      a2, 40(sp)
+    sw      a3, 44(sp)
+
+    li      t0, @TxtPrinter
+    sw      t0, 0(s0) // printer
+    sw      r0, 4(s0) // dlist end
+    sh      r0, 8(s0) // x
+    sh      r0, 10(s0) // y
+    li      t0, 0xC
+    sw      t0, 12(s0) // unknown
+    sw      r0, 16(s0) // color
+
+    li      t0, @global_context
+    lw      s1, 0(t0)
+    lw      t2, @dlist_offset(s1)
+
+    mov     a0, s0
+    mov     a1, t2
+    jal     @DoTxtStruct
     nop
 
-[ObjectSpawn]: 0x80097C00
-[ObjectIndex]: 0x8009812C
+    lbu     a1, 36(sp)
+    lbu     a2, 37(sp)
+    lbu     a3, 38(sp)
+    lbu     t1, 39(sp)
+    sw      t1, 0x10(sp)
+    jal     @SetTextRGBA
+    mov     a0, s0
+
+    lh      a1, 32(sp)
+    lh      a2, 34(sp)
+    jal     @SetTextXY
+    mov     a0, s0
+
+    lw      a1, 40(sp)
+    lw      a2, 44(sp)
+    jal     @SetTextString
+    mov     a0, s0
+
+    mov     a0, s0
+    jal     @UpdateTxtStruct
+    nop
+
+    sw      v0, @dlist_offset(s1)
+
+    jpop    4, 1, s0, s1, ra
 
 ObjectSpawnWrap:
     // keep track of which objects we're spawning