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mode7: more timing info
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@ -66,8 +66,8 @@ draw_stars:
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lda #$ff ; want if z<16, color = 5 ; 2
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sta COLOR ; if 16<z<32 color = 13 ; 3
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; if 32<z<64 color = 15
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ldy XX ; 3
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lda star_z,Y ; 5
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lda star_z,X ; 4
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tay ; put star_z[i] in X for later ; 2
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cmp #32 ; 2
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@ -94,31 +94,32 @@ done_color:
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lda z_table,Y ; 4
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sta NUM1L ; F ; 3
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; adjust for 58+
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; adjust spacez for 58+
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; all this logic to avoid having a 128 byte table of mostly zero
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lda #0 ; I
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clc
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cpy #60 ; 59 -1 60 0 61 1
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bmi no_adjust
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adc #1 ; 60, 61 = 1
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cpy #62 ; 61 -1 62 0 63 1
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bmi no_adjust
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adc #1 ; 62 = 2
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cpy #63 ; 62 = -1 63 = 0 64 = not possible
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bne no_adjust
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adc #2 ; 63 = 4
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lda #0 ; I ; 2
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clc ; 2
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cpy #60 ; 59 -1 60 0 61 1 ; 2
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bmi no_adjust ; 2nt/3
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adc #1 ; 60, 61 = 1 ; 2
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cpy #62 ; 61 -1 62 0 63 1 ; 2
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bmi no_adjust ; 2nt/3
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adc #1 ; 62 = 2 ; 2
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cpy #63 ; 62 = -1 63 = 0 64 = not possible ; 2
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bne no_adjust ; 2nt/3
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adc #2 ; 63 = 4 ; 2
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no_adjust:
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sta NUM1H
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sta NUM1H ; store int part of spacez ; 3
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; load stars[i].x into NUM2H:NUM2L
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; NUM2L is always zero
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ldy XX
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ldy XX ; 3
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lda star_x,Y
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sta NUM2H
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lda star_x,Y ; 4
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sta NUM2H ; 3
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lda #0
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sta NUM2L
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lda #0 ; 2
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sta NUM2L ; 3
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sec ; don't reuse old values
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jsr multiply
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