From ba8662055f0059a9049ede8d83cc7b40a3710871 Mon Sep 17 00:00:00 2001
From: greg <elorian.mestec@gmail.com>
Date: Mon, 5 Dec 2016 19:24:36 -0800
Subject: [PATCH] Add test_gfx rom-building infrastructure

---
 Makefile      |   9 +-
 test_gfx.asm  | 315 ++++++++++++++++++++++++++++++++++++++++++++++++++
 test_gfx.link |   2 +
 3 files changed, 325 insertions(+), 1 deletion(-)
 create mode 100644 test_gfx.asm
 create mode 100644 test_gfx.link

diff --git a/Makefile b/Makefile
index 7704618..c7751a6 100644
--- a/Makefile
+++ b/Makefile
@@ -1,9 +1,16 @@
 #all: smc
-all: tic_tac
+all: test_gfx
 
 BINPATH := /home/greg/code/wla-dx/binaries
 
 
+test_gfx: test_gfx.obj
+	$(BINPATH)/wlalink -v -r test_gfx.link test_gfx.smc
+
+test_gfx.obj: test_gfx.asm
+	$(BINPATH)/wla-65816 -v -o test_gfx.obj test_gfx.asm
+
+
 tic_tac: tic_tac.obj
 	$(BINPATH)/wlalink -v -r tic_tac.link tic_tac.smc
 
diff --git a/test_gfx.asm b/test_gfx.asm
new file mode 100644
index 0000000..440c838
--- /dev/null
+++ b/test_gfx.asm
@@ -0,0 +1,315 @@
+.include "header.inc"
+.include "snes_init.asm"
+
+.BANK 0 SLOT 0
+.org 0
+.section "Vblank"
+
+.MACRO Spin_Loop ARGS XCOUNT
+
+; it is fucktarded that this macro doesn't work properly with immediates
+;ldx XCOUNT
+ldx #XCOUNT
+lvl3\@:
+    lda #$ff
+    lvl2\@:
+        xba
+        lda #$ff
+        lvl1\@:
+            dea
+            cmp #$00
+            bne lvl1\@
+        xba
+        dea
+        cmp #$00
+        bne lvl2\@
+    dex
+    txa
+    cmp #$00
+    bne lvl3\@
+.ENDM
+
+VBlank:
+    rti
+
+.ENDS
+
+.BANK 0 SLOT 0
+.ORG 0
+.section "Main"
+
+Start:
+    Snes_Init
+
+; 16-bit xy, 8-bit a
+rep #%00010000
+sep #%00100000
+
+
+
+; Load palette by writing to $2122
+; .db $00, $00, $E0, $7F, $1F, $00, $FF, $03
+
+
+lda #$00
+sta $2122
+lda #$00
+sta $2122
+lda #$e0
+sta $2122
+lda #$7f
+sta $2122
+lda #$1f
+sta $2122
+lda #$00
+sta $2122
+lda #$ff
+sta $2122
+lda #$0a
+sta $2122
+
+
+;ldx #$0000
+;- lda UntitledPalette.l, x
+;sta $2122  ; $2122 - data for CG RAM write
+;inx
+;cpx #8
+;bne -
+
+lda #33
+sta $2121  ; address for CG RAM write
+lda.l Palette2
+sta $2122
+lda.l Palette2 + 1
+sta $2122
+
+ldx #UntitledData
+lda #:UntitledData
+ldy #(15*16*2)
+
+;$43X0 is DMA register X, X from 0 to 7
+stx $4302 ;A address low byte
+sta $4304 ;A address bank
+sty $4305 ;number of bytes to transfer
+
+lda #%00000001 ;set mode transfer words
+sta $4300
+
+lda #$18            ; $211[89]: VRAM data write
+sta $4301           ; set destination
+
+ldy #$0000
+sty $2116
+
+lda #%00000001
+sta $420b ;start DMA
+
+
+; write to BG1
+
+lda #%10000000 ; VRAM writing mode
+sta $2115
+
+ldx #$5000
+stx $2116 ; write to VRAM
+
+;ugly code starts here - it writes the # shape I mentioned before.
+.rept 2
+   ;X|X|X
+   .rept 2
+     ldx #$0000 ; tile 0 ( )
+     stx $2118
+     ldx #$0002 ; tile 2 (|)
+     stx $2118
+   .endr
+   ldx #$0000
+   stx $2118
+   ;first line finished, add BG's
+   .rept 27
+     stx $2118  ; X=0
+   .endr
+   ;beginning of 2nd line
+   ;-+-+-
+   .rept 2
+     ldx #$0004 ; tile 4 (-)
+     stx $2118
+     ldx #$0006 ; tile 6 (+)
+     stx $2118
+   .endr
+   ldx #$0004   ; tile 4 (-)
+   stx $2118
+   ldx #$0000
+   .rept 27
+     stx $2118
+   .endr
+.endr
+.rept 2
+  ldx #$0000    ; tile 0 ( )
+  stx $2118
+  ldx #$0002    ; tile 2 (|)
+  stx $2118
+.endr
+
+
+
+; BG2 starts at $6000
+ldx #$6000
+stx $2116
+
+ldx #$000c ;and contains one tile
+stx $2118 ;data for VRAM write register
+
+
+
+
+; set up the screen
+
+lda #%00110000 ; 16x16 tiles, mode 0
+sta $2105     ; $2105 is the mode for bg mode + tile size
+
+lda #$50 ; data starts from $4000
+sta $2107      ; for bg1     ; $2107 is address of tile map location for BG1
+; tile map location registers:
+; %aaaaaass
+; a's <- tile map address location, << 11
+; ss <-  32x32, 32x64, 32x64, 64x64
+
+lda #60 ; and $6000
+sta $2108 ; for bg2   ; and $2108 is tile map location for BG2
+
+stz $210b	    ; BG1 and BG2 use the $0000 tiles
+
+lda #%00000011  ; enable bg1 and 2
+sta $212C
+
+;The PPU doesn't process the top line, so we scroll down 1 line.
+rep #$20        ; 16bit a
+lda #$07FF      ; this is -1 for BG1
+sep #$20        ; 8bit a
+sta $210E       ; BG1 vert scroll
+xba
+sta $210E
+
+rep #$20        ; 16bit a
+lda #$FFFF      ; this is -1 for BG2
+sep #$20        ; 8bit a
+sta $2110       ; BG2 vert scroll
+xba
+sta $2110
+
+lda #%00001111  ; enable screen, set brightness to 15
+sta $2100
+
+lda #%10000001  ; enable NMI and joypads
+sta $4200
+
+mainloop:
+    Spin_Loop $02
+
+    stz $2121
+
+    lda #$00
+    sta $2122
+    lda #$00
+    sta $2122
+    lda #$e0
+    sta $2122
+    lda #$7f
+    sta $2122
+    lda #$1f
+    sta $2122
+    lda #$00
+    sta $2122
+    lda #$ff
+    sta $2122
+    lda #$0a
+    sta $2122
+
+    ;change brightness
+    ;lda #%00000011
+    ;sta $2100
+
+    ;lda #%00110000
+    ;sta $2105
+
+    Spin_Loop $02
+
+    lda #0
+    sta $2121
+
+    lda #$09
+    sta $2122
+    lda #$00
+    sta $2122
+    lda #$e0
+    sta $2122
+    lda #$7f
+    sta $2122
+    lda #$1f
+    sta $2122
+    lda #$00
+    sta $2122
+    lda #$ff
+    sta $2122
+    lda #$7f
+    sta $2122
+
+    ;lda #$0f
+    ;sta $2100
+
+    ;lda #%00000000
+    ;sta $2105
+
+    jmp mainloop
+
+.ENDS
+
+
+.BANK 1 SLOT 0
+.org 0
+.section "TileData"
+
+UntitledData:
+    .db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
+    .db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
+    .db $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03
+    .db $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0
+    .db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $FF, $FF, $FF, $FF
+    .db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $FF, $FF, $FF, $FF
+    .db $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $FF, $FF, $FF, $FF
+    .db $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $FF, $FF, $FF, $FF
+    .db $00, $C0, $00, $E0, $00, $70, $00, $38, $00, $1C, $00, $0E, $00, $07, $00, $03
+    .db $00, $03, $00, $07, $00, $0E, $00, $1C, $00, $38, $00, $70, $00, $E0, $00, $C0
+    .db $00, $07, $00, $0F, $00, $18, $00, $30, $00, $60, $00, $C0, $00, $C0, $00, $C0
+    .db $00, $E0, $00, $F0, $00, $18, $00, $0C, $00, $06, $00, $03, $00, $03, $00, $03
+    .db $FC, $00, $F8, $00, $F0, $00, $E0, $00, $C0, $00, $80, $00, $00, $00, $00, $00
+    .db $3F, $00, $1F, $00, $0F, $00, $07, $00, $03, $00, $01, $00, $00, $00, $00, $00
+    .db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
+    .db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
+    .db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
+    .db $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
+    .db $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03
+    .db $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0
+    .db $FF, $FF, $FF, $FF, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
+    .db $FF, $FF, $FF, $FF, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00, $00
+    .db $FF, $FF, $FF, $FF, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03, $03
+    .db $FF, $FF, $FF, $FF, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0, $C0
+    .db $00, $03, $00, $07, $00, $0E, $00, $1C, $00, $38, $00, $70, $00, $E0, $00, $C0
+    .db $00, $C0, $00, $E0, $00, $70, $00, $38, $00, $1C, $00, $0E, $00, $07, $00, $03
+    .db $00, $C0, $00, $C0, $00, $C0, $00, $60, $00, $30, $00, $18, $00, $0F, $00, $07
+    .db $00, $03, $00, $03, $00, $03, $00, $06, $00, $0C, $00, $18, $00, $F0, $00, $E0
+    .db $00, $00, $00, $00, $80, $00, $C0, $00, $E0, $00, $F0, $00, $F8, $00, $FC, $00
+    .db $00, $00, $00, $00, $01, $00, $03, $00, $07, $00, $0F, $00, $1F, $00, $3F, $00
+
+UntitledPalette:
+    ;color schema here is %0RRRRRBB BBBGGGGG
+    ; final 2 bytes seem to be grid
+    ;.db %00000000, %00000000, %11100000, %01111111, %00011111, %00000000, %00000011 %11111111
+    .db $00, $00, $E0, $7F, $1F, $00, $FF, $03
+Palette2:
+    .db $E0, $7F
+
+; 30 tiles (2 spaces)
+; 480 bytes
+
+.ENDS
diff --git a/test_gfx.link b/test_gfx.link
new file mode 100644
index 0000000..9ab573f
--- /dev/null
+++ b/test_gfx.link
@@ -0,0 +1,2 @@
+[objects]
+test_gfx.obj