174 lines
3.2 KiB
ArmAsm
174 lines
3.2 KiB
ArmAsm
;========================================================================
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; EVERYTHING IS CYCLE COUNTED
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;========================================================================
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; Note, can save cycles if we don't have early-exit (check)
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; also if we don't have to convert from 1.77
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; the logic here:
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;
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; if (current_line==0) && (subframe==0) {
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; set_pattern();
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;; }
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; if (subframe==0) {
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; decode_line();
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; }
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; else {
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; }
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; if (pattern_done) {
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;
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; }
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; subframe++;
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; if (subframe==speed) {
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; subframe=0;
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; current_line++;
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; if (current_line==64) {
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; pattern++;
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; current_line=0;
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; }
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; }
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;=====================================
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;=====================================
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;=====================================
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; pt3 make frame
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;=====================================
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;=====================================
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;=====================================
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; update pattern or line if necessary
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; then calculate the values for the next frame
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; 8+373=381
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; Paths
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;
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; A (current_line)
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;
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; B (current subframe)
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;
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; C (pattern_done)
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;
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; D (always)
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;
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; F
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;
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; C
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;=============================
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; State A
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;=============================
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pt3_make_frame:
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; see if we need a new pattern
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; we do if line==0 and subframe==0
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; allow fallthrough where possible
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current_line_smc:
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lda #$d1 ; 2
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beq check_subframe ; 3
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; -1
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;=============================
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; State B
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;=============================
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;
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pattern_good:
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; see if we need a new line
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current_subframe_smc:
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lda #$d1 ; 2
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bne line_good ; 3
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; -1
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;=============================
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; State C
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;=============================
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;
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pt3_new_line:
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; decode a new line
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jsr pt3_decode_line ; 6+?
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; check if pattern done early
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pt3_pattern_done_smc:
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lda #$d1 ; 2
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bne line_good ; 2/3
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;=============================
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; State D
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;=============================
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;==========================
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; pattern done early!
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early_end:
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; A is pattern_done which is zero at this point
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inc current_pattern_smc+1 ; increment pattern ; 6
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sta current_line_smc+1 ; 4
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sta current_subframe_smc+1 ; 4
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; always goes to set_pattern here?
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jmp set_pattern ; 3
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;=============================
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; State E
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;=============================
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check_subframe:
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lda current_subframe_smc+1 ; 4
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bne pattern_good ; 2/3
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;=============================
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; State F
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;=============================
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set_pattern:
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; load a new pattern in
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jsr pt3_set_pattern ;6+?
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jmp pt3_new_line ; 3
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;=============================
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; State D
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;=============================
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;
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line_good:
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; Increment everything
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inc current_subframe_smc+1 ; subframe++ ; 6
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lda current_subframe_smc+1 ; 4
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; if we hit pt3_speed, move to next
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pt3_speed_smc:
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eor #$d1 ; 2
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bne do_frame ; 3
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; -1
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;=============================
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; State G
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;=============================
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;
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next_line:
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sta current_subframe_smc+1 ; reset subframe to 0 ; 4
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inc current_line_smc+1 ; and increment line ; 6
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lda current_line_smc+1 ; 4
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eor #64 ; always end at 64. ; 2
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bne do_frame ; is this always needed? ; 2/3
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next_pattern:
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sta current_line_smc+1 ; reset line to 0 ; 4
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inc current_pattern_smc+1 ; increment pattern ; 6
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;==============================================
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; falls through to do_frame
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