Nametable confusion

.gitignore

@@ -0,0 +1,3 @@
+*.o
+.DS_Store
+run

plat.s

@@ -26,8 +26,9 @@ INES_SRAM   = 0
 .segment "CODE"
 reset:
     sei
-    lda #0
+    lda #%00100000 ; 8x16 sprites
     sta $2000
+    lda #0
     sta $2001
     sta $4015
     sta $4010
@@ -324,7 +325,27 @@ gamepad_poll:
 
 
 .segment "RODATA"
+
+level:
+.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,1,0,0,1,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,0,1,1,0,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+.byte 0,0,0,0,0,0,0,0,1,0,1,0,1,0,0,0
+.byte 0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0
+.byte 0,0,0,0,0,0,0,0,1,0,1,0,1,0,0,0
+.byte 0,0,0,0,0,0,0,0,0,1,0,1,0,0,0,0
+.byte 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0
+
 example_palette:
+.byte $0F,$00,$3D,$20 ; greyscale
+.byte $0F,$09,$1A,$16 ; grass
 .byte $0F,$15,$26,$37 ; bg0 purple/pink
 .byte $0F,$09,$19,$29 ; bg1 green
 .byte $0F,$01,$11,$21 ; bg2 blue
@@ -335,12 +356,16 @@ example_palette:
 .byte $0F,$12,$22,$32 ; sp3 marine
 
 .segment "ZEROPAGE"
-velocities: .res 8
+buttons:    .res 1
+
+vel_x: .res 1
+vel_y: .res 1
 
 cursor_x: .res 1
 cursor_y: .res 1
 temp_x:   .res 1
 temp_y:   .res 1
+temp_mul: .res 1
 var_m:    .res 1
 var_n:    .res 1
 var_o:    .res 1
@@ -370,14 +395,18 @@ main:
 
     jsr init_objects
 @loop:
-@draw:
-	jsr draw
-	jsr ppu_update
-
     lda frame_counter
     clc
     adc #1
     sta frame_counter
+
+    jsr controller
+    jsr movement
+
+@draw:
+    jsr update_background
+	jsr ppu_update
+
 	jmp @loop
 
 init_objects:
@@ -398,10 +427,6 @@ init_objects:
         lsr
         sta oam+1, X
 
-        tay
-        lda #0
-        sta velocities, Y
-
         inx
         inx
         inx
@@ -409,43 +434,119 @@ init_objects:
         cpx #(8*4)
         bne :-
 
+    lda #0
+    sta vel_x
+    sta vel_y
+
     rts
 
 draw:
+@end:
+	rts
+
+movement:
+    ; Horizontal velocity
+    ldx #0
+    jsr btn_right
+    cmp #0
+    beq :+
+        ldx #1
+        lda #3
+        sta vel_x
+    :
+
+    jsr btn_left
+    cmp #0
+    beq :+
+        ldx #1
+        lda #253
+        sta vel_x
+    :
+
+    cpx #1
+    beq @end
+        lda frame_counter
+        and #1
+        cmp #0
+        bne @end
+
+        lda #0
+        cmp vel_x
+        beq @end ; If vel_x = 0, skip decay
+
+        ; If vel_x > 0, decrement
+        bpl :+
+            ldx vel_x
+            dex
+            stx vel_x
+            jmp @end
+        :
+        ; Else if vel_x < 0, increment
+        ldx vel_x
+        inx
+        stx vel_x
+    @end:
+
+    ; Jump
+    jsr btn_up
+    cmp #0
+    beq :+
+        lda #250
+        sta vel_y
+    :
+
+
+    ; Gravity
     lda frame_counter
     and #1
     cmp #0
-    bne @end
+    bne :+
-
+        lda vel_y
-    ldx #0
-    ldy #0
-    :
-        lda velocities, Y
         clc
         adc #1    ; Add 2 to velocity
-        sta velocities, Y
+        sta vel_y
+    :
 
-        lda oam+0, X
+    ; Apply Y velocity
-        clc
+    lda oam+0
-        adc velocities, Y
+    clc
-        sta oam+0, X
+    adc vel_y
+    sta oam+0
 
-        cmp #200
+    ; Keep grounded
-        bmi :+
+    cmp #200
-            lda #245
+    bcc :+
-            sta velocities, Y
+        lda #0
-        :
+        sta vel_y
+        lda #200
+        sta oam+0
+    :
 
-        inx
+    ; Apply X velocity
-        inx
+    lda oam+3
-        inx
+    clc
-        inx
+    adc vel_x
+    sta oam+3
 
-        iny
+
-        cpy #8
+    rts
-        bne :--
+
-@end:
+update_background:
-	rts
+    rts
+    ;lda $2002
+    ;lda #$20
+    ;sta $2006
+    ;lda #$00
+    ;sta $2006
+
+    ldx #1
+    ldy #1
+    jsr ppu_update_tile
+
+    lda #1
+    sta $2007
+
+    rts
 
 setup_background:
 	lda $2002 ; reset latch
@@ -465,14 +566,45 @@ setup_background:
 		dey
 		bne :--
 	; set all attributes to 0
+    lda #0
 	ldx #64 ; 64 bytes
 	:
+        txa
+        and #%00000011
+        asl
+        asl
+        asl
+        asl
+        sta temp
+        txa
+        and #%00000011
+        ora temp
+        lda #0
+
 		sta $2007
 		dex
 		bne :-
+
+
+
+    lda $2002
+    lda $20
+    sta $2006
+    lda $00
+    sta $2006
+	ldy #0
+	:
+        lda level, Y
+        lda #4
+        sta $2007
+		iny
+        cpy #240
+		bne :-
+
+
 	; fill in an area in the middle with 1/2 checkerboard
 	lda #1
-	ldy #8 ; start at row 8
+	ldy #0 ; start at row 8
 	:
 		pha ; temporarily store A, it will be clobbered by ppu_address_tile routine
 		ldx #8 ; start at column 8
@@ -528,3 +660,105 @@ setup_background:
 
 	rts
 
+mul_x:
+    sta temp_mul
+    lda #0
+    :
+        clc
+        adc temp_mul
+        dex
+        bne :-
+    rts
+
+mul_y:
+    sta temp_mul
+    lda #0
+    :
+        clc
+        adc temp_mul
+        dey
+        bne :-
+    rts
+
+controller:
+    lda #1
+    sta $4016
+    sta buttons
+    lda #0
+    sta $4016
+    :
+        lda $4016
+        lsr
+        rol buttons
+        bcc :-
+
+    rts
+
+btn_right:
+    lda buttons
+    and #%00000001
+    rts
+
+btn_left:
+    lda buttons
+    and #%00000010
+    lsr
+    rts
+
+btn_down:
+    lda buttons
+    and #%00000100
+    lsr
+    lsr
+    rts
+
+btn_up:
+    lda buttons
+    and #%00001000
+    lsr
+    lsr
+    lsr
+    rts
+
+btn_start:
+    lda buttons
+    and #%00010000
+    lsr
+    lsr
+    lsr
+    lsr
+    rts
+
+btn_select:
+    lda buttons
+    and #%00100000
+    lsr
+    lsr
+    lsr
+    lsr
+    lsr
+    rts
+
+btn_b:
+    lda buttons
+    and #%01000000
+    lsr
+    lsr
+    lsr
+    lsr
+    lsr
+    lsr
+    rts
+
+btn_a:
+    lda buttons
+    and #%10000000
+    lsr
+    lsr
+    lsr
+    lsr
+    lsr
+    lsr
+    lsr
+    rts
+