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chiptune/mode7: update rasterbars code comments
This commit is contained in:
Vince Weaver
parent
4efc30a019
commit
af0d298dbe
@ -66,19 +66,19 @@ init_rows:
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ldy SCREEN_Y ; 3
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lda #COLOR_BOTH_DARKBLUE ; red ; 2
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lda #COLOR_BOTH_DARKBLUE ; d. blue ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_MEDIUMBLUE ; red ; 2
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lda #COLOR_BOTH_MEDIUMBLUE ; m.blue ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_AQUA ; red ; 2
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lda #COLOR_BOTH_AQUA ; aqua ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_PINK ; red ; 2
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lda #COLOR_BOTH_PINK ; pink ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_RED ; red ; 2
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lda #COLOR_BOTH_RED ; red ; 2
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jsr set_row_color ; 6+136
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;==============
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@ -96,7 +96,7 @@ draw_rows_loop:
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sta COLOR ; 3
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sty TEMPY ; 3
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tya ; 2
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tya ; y*2 ; 2
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asl ; 2
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tay ; 2
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@ -1,5 +1,8 @@
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; Not quite a raster-bar, but why not
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; Turns out this is quite the CPU hog.
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; Optimized a bit based on the version in the chiptune player
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;===========
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; CONSTANTS
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;===========
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@ -20,42 +23,47 @@ draw_rasters:
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; clear rows
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ldy #(NUM_ROWS-1) ; 2
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lda #0 ; 2
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ldy #(NUM_ROWS-1) ; 2
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lda #0 ; 2
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init_rows:
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sta row_color,Y ; 5
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dey ; 2
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bpl init_rows ; 2nt/3
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sta row_color,Y ; 5
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dey ; 2
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bpl init_rows ; 2nt/3
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;================
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; 4+(10*20) = 204
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; could be 82 if unroll
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; at 6*code size
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;================
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; set colors
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lda #COLOR_BOTH_AQUA ; aqua
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ldy SCREEN_Y
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jsr set_row_color
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ldy SCREEN_Y ; 3
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lda #COLOR_BOTH_MEDIUMBLUE ; medium blue
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jsr set_row_color
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lda #COLOR_BOTH_AQUA ; aqua ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_LIGHTGREEN ; light green
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jsr set_row_color
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lda #COLOR_BOTH_MEDIUMBLUE ; medium blue ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_DARKGREEN ; green
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jsr set_row_color
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lda #COLOR_BOTH_LIGHTGREEN ; light green ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_YELLOW ; yellow
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jsr set_row_color
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lda #COLOR_BOTH_DARKGREEN ; green ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_ORANGE ; orange
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jsr set_row_color
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lda #COLOR_BOTH_YELLOW ; yellow ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_PINK ; pink
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jsr set_row_color
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lda #COLOR_BOTH_ORANGE ; orange ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_RED ; red
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jsr set_row_color
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lda #COLOR_BOTH_PINK ; pink ; 2
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jsr set_row_color ; 6+136
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lda #COLOR_BOTH_RED ; red ; 2
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jsr set_row_color ; 6+136
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;======================
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; 3+(8*144) = 1155
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;=================
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; draw rows
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@ -66,34 +74,52 @@ draw_rows_loop:
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sta COLOR ; 3
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sty TEMPY ; 3
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tya ; 2
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pha ; 3
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asl ; 2
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asl ; y*2 ; 2
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tay ; 2
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; hlin_setup inlined
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lda gr_offsets,Y ; lookup low-res memory address ; 4
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sta GBASL ; 3
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iny ; 2
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lda gr_offsets,Y ; 4
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clc ; 2
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adc DRAW_PAGE ; add in draw page offset ; 3
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sta GBASH ; 3
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ldy #39 ; 2
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sty V2 ; 3
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ldy #0 ; 2
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jsr hlin_double ; hlin y,V2 at A ; 63+(X*16)
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pla ; 4
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tay ; 2
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lda COLOR ; 3
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double_loop:
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sta (GBASL),Y ; 6
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dey ; 2
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bpl double_loop ; 2nt/3
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ldy TEMPY ; 3
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draw_rows_skip:
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dey ; 2
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bpl draw_rows_loop ; 2
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bpl draw_rows_loop ; 2nt/3
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;======================
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; 2+20*(53+11*40)=9862
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; *note* worst case
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;==================
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; update y pointer
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;==================
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ldy SCREEN_Y
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iny
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cpy #ELEMENTS
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bne not_there
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ldy #0
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ldy SCREEN_Y ; 3
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iny ; 2
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cpy #ELEMENTS ; 2
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bne not_there ; 2nt/3
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ldy #0 ; 2
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not_there:
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sty SCREEN_Y
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sty SCREEN_Y ; 3
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rts
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rts ; 6
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;=============
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; 24
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;===================
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;===================
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@ -106,62 +132,64 @@ not_there:
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; A, X trashed
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set_row_color:
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sta COLOR
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tya ; wrap y offset
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and #(ELEMENTS-1)
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tax
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sta COLOR ; 3
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tya ; wrap y offset ; 2
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and #(ELEMENTS-1) ; 2
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tax ; 2
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lda fine_sine,X ; lookup sine value
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lda fine_sine,X ; lookup sine value ; 4
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; pre-shifted right by 4, sign-extended
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clc
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adc #18 ; add in 18 to center on screen
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; 18 added to center
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sin_no_more:
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pha ; save row value
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jsr put_color ; put color at row
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pla ; restore row value
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pha ; save row value ; 3
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jsr put_color ; put color at row ; 6+44
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pla ; restore row value ; 4
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clc ; increment row value
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adc #1
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clc ; increment row value ; 2
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adc #1 ; 2
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jsr put_color ; put color at row
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jsr put_color ; put color at row ; 6+44
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iny ; increment for next time
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rts
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iny ; increment for next time ; 2
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rts ; 6
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;============
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; 132
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;==================
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; put_color
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;==================
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; A = row to set color of
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; A trashed
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put_color:
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clc
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ror ; row/2, with even/odd in carry
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tax ; put row/2 in X
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clc ; 2
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ror ; row/2, with even/odd in carry ; 2
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tax ; put row/2 in X ; 2
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bcc even_line ; if even, skip to even
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bcc even_line ; if even, skip to even ; 2nt/3
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odd_line:
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lda #$f0 ; load mask for odd
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bcs finish_line
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lda #$f0 ; load mask for odd ; 2
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bcs finish_line ; 2nt/3
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even_line:
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lda #$0f ; load mask for even
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lda #$0f ; load mask for even ; 2
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finish_line:
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sta MASK
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sta MASK ; 3
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and COLOR ; mask off color
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sta COLOR2 ; store for later
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and COLOR ; mask off color ; 3
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sta COLOR2 ; store for later ; 3
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lda MASK
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eor #$ff ; invert mask
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and row_color,X ; load existing color
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lda MASK ; 3
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eor #$ff ; invert mask ; 2
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and row_color,X ; load existing color ; 4
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ora COLOR2 ; combine
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sta row_color,X ; store back
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ora COLOR2 ; combine ; 3
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sta row_color,X ; store back ; 5
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rts
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rts ; 6
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;============
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; 44
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;======================
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; some arrays
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@ -171,74 +199,77 @@ row_color:
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.byte $00,$00,$00,$00,$00, $00,$00,$00,$00,$00
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.byte $00,$00,$00,$00,$00, $00,$00,$00,$00,$00
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; arithmatically shifted right by 4
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; arithmatically shifted right by 4, sign extended, added 18 to center
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; FIXME: exploit symmetry and get rid of 3/4 of this table
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; possibly not worth the extra code
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fine_sine:
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.byte $00 ; 0.000000
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.byte $01 ; 0.098017
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.byte $03 ; 0.195090
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.byte $04 ; 0.290285
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.byte $06 ; 0.382683
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.byte $07 ; 0.471397
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.byte $08 ; 0.555570
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.byte $0A ; 0.634393
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.byte $0B ; 0.707107
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.byte $0C ; 0.773010
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.byte $0D ; 0.831470
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.byte $0E ; 0.881921
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.byte $0E ; 0.923880
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.byte $0F ; 0.956940
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.byte $0F ; 0.980785
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.byte $0F ; 0.995185
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.byte $0F ; 1.000000
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.byte $0F ; 0.995185
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.byte $0F ; 0.980785
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.byte $0F ; 0.956940
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.byte $0E ; 0.923880
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.byte $0E ; 0.881921
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.byte $0D ; 0.831470
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.byte $0C ; 0.773010
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.byte $0B ; 0.707107
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.byte $0A ; 0.634393
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.byte $08 ; 0.555570
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.byte $07 ; 0.471397
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.byte $06 ; 0.382683
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.byte $04 ; 0.290285
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.byte $03 ; 0.195090
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.byte $01 ; 0.098017
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.byte $00 ; 0.000000
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.byte $00+18 ; 0.000000 ; a[y] 00..10
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.byte $01+18 ; 0.098017 ; a[32-y] 11..20
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.byte $03+18 ; 0.195090 ; ~a[y-33] 21..30
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.byte $04+18 ; 0.290285 ; ~a[64-y] 31..3f
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.byte $06+18 ; 0.382683
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.byte $07+18 ; 0.471397
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.byte $08+18 ; 0.555570
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.byte $0A+18 ; 0.634393
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.byte $0B+18 ; 0.707107
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.byte $0C+18 ; 0.773010
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.byte $0D+18 ; 0.831470
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.byte $0E+18 ; 0.881921
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.byte $0E+18 ; 0.923880
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.byte $0F+18 ; 0.956940
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.byte $0F+18 ; 0.980785
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.byte $0F+18 ; 0.995185
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.byte $FE ; -0.098017
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.byte $FC ; -0.195090
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.byte $FB ; -0.290285
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.byte $F9 ; -0.382683
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.byte $F8 ; -0.471397
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.byte $F7 ; -0.555570
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.byte $F5 ; -0.634393
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.byte $F4 ; -0.707107
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.byte $F3 ; -0.773010
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.byte $F2 ; -0.831470
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.byte $F1 ; -0.881921
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.byte $F1 ; -0.923880
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.byte $F0 ; -0.956940
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.byte $F0 ; -0.980785
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.byte $F0 ; -0.995185
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.byte $F0 ; -1.000000
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.byte $F0 ; -0.995185
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.byte $F0 ; -0.980785
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.byte $F0 ; -0.956940
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.byte $F1 ; -0.923880
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.byte $F1 ; -0.881921
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.byte $F2 ; -0.831470
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.byte $F3 ; -0.773010
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.byte $F4 ; -0.707107
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.byte $F5 ; -0.634393
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.byte $F7 ; -0.555570
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.byte $F8 ; -0.471397
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.byte $F9 ; -0.382683
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.byte $FB ; -0.290285
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.byte $FC ; -0.195090
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.byte $FE ; -0.098017
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.byte $0F+18 ; 1.000000
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.byte $0F+18 ; 0.995185
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.byte $0F+18 ; 0.980785
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.byte $0F+18 ; 0.956940
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.byte $0E+18 ; 0.923880
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.byte $0E+18 ; 0.881921
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.byte $0D+18 ; 0.831470
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.byte $0C+18 ; 0.773010
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.byte $0B+18 ; 0.707107
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.byte $0A+18 ; 0.634393
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.byte $08+18 ; 0.555570
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.byte $07+18 ; 0.471397
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.byte $06+18 ; 0.382683
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.byte $04+18 ; 0.290285
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.byte $03+18 ; 0.195090
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.byte $01+18 ; 0.098017
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.byte $00+18 ; 0.000000
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.byte ($FE+18)&$ff ; -0.098017
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.byte ($FC+18)&$ff ; -0.195090
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.byte ($FB+18)&$ff ; -0.290285
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.byte ($F9+18)&$ff ; -0.382683
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.byte ($F8+18)&$ff ; -0.471397
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.byte ($F7+18)&$ff ; -0.555570
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.byte ($F5+18)&$ff ; -0.634393
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.byte ($F4+18)&$ff ; -0.707107
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.byte ($F3+18)&$ff ; -0.773010
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.byte ($F2+18)&$ff ; -0.831470
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.byte ($F1+18)&$ff ; -0.881921
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.byte ($F1+18)&$ff ; -0.923880
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.byte ($F0+18)&$ff ; -0.956940
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.byte ($F0+18)&$ff ; -0.980785
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.byte ($F0+18)&$ff ; -0.995185
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.byte ($F0+18)&$ff ; -1.000000
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.byte ($F0+18)&$ff ; -0.995185
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.byte ($F0+18)&$ff ; -0.980785
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.byte ($F0+18)&$ff ; -0.956940
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.byte ($F1+18)&$ff ; -0.923880
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.byte ($F1+18)&$ff ; -0.881921
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.byte ($F2+18)&$ff ; -0.831470
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.byte ($F3+18)&$ff ; -0.773010
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.byte ($F4+18)&$ff ; -0.707107
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.byte ($F5+18)&$ff ; -0.634393
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.byte ($F7+18)&$ff ; -0.555570
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.byte ($F8+18)&$ff ; -0.471397
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.byte ($F9+18)&$ff ; -0.382683
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.byte ($FB+18)&$ff ; -0.290285
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.byte ($FC+18)&$ff ; -0.195090
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.byte ($FE+18)&$ff ; -0.098017
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