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interlace: more work

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This commit is contained in:
Vince Weaver 2019-09-20 00:18:10 -04:00
parent d5f92ae451
commit 0cdec7d305
1 changed files with 52 additions and 4 deletions
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56
interlace_demo/pt3_lib_make_frame.s
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@ -2,6 +2,31 @@
; EVERYTHING IS CYCLE COUNTED ; EVERYTHING IS CYCLE COUNTED
;======================================================================== ;========================================================================
; Note, can save cycles if we don't have early-exit (check)
; also if we don't have to convert from 1.77
; the logic here:
;
; if (current_line==0) && (subframe==0) {
; set_pattern();
;; }
; if (subframe==0) {
; decode_line();
; }
; else {
; }
; if (pattern_done) {
;
; }
; subframe++;
; if (subframe==speed) {
; subframe=0;
; current_line++;
; if (current_line==64) {
; pattern++;
; current_line=0;
; }
; }
;===================================== ;=====================================
;===================================== ;=====================================
@ -19,9 +44,21 @@
; Paths ; Paths
; ;
; current_line=0 ; A (current_line)
; current_line=1 ;
; B (current subframe)
;
; C (pattern_done)
;
; D (always)
;
; F
;
; C
;=============================
; State A
;=============================
pt3_make_frame: pt3_make_frame:
; see if we need a new pattern ; see if we need a new pattern
; we do if line==0 and subframe==0 ; we do if line==0 and subframe==0
@ -34,7 +71,7 @@ current_line_smc:
;============================= ;=============================
; State B ; State B
;============================= ;=============================
; ;
pattern_good: pattern_good:
; see if we need a new line ; see if we need a new line
@ -46,7 +83,7 @@ current_subframe_smc:
;============================= ;=============================
; State C ; State C
;============================= ;=============================
; ;
pt3_new_line: pt3_new_line:
; decode a new line ; decode a new line
jsr pt3_decode_line ; 6+? jsr pt3_decode_line ; 6+?
@ -58,6 +95,10 @@ pt3_pattern_done_smc:
bne line_good ; 2/3 bne line_good ; 2/3
;=============================
; State D
;=============================
;========================== ;==========================
; pattern done early! ; pattern done early!
@ -71,10 +112,17 @@ early_end:
jmp set_pattern ; 3 jmp set_pattern ; 3
;=============================
; State E
;=============================
check_subframe: check_subframe:
lda current_subframe_smc+1 ; 4 lda current_subframe_smc+1 ; 4
bne pattern_good ; 2/3 bne pattern_good ; 2/3
;=============================
; State F
;=============================
set_pattern: set_pattern:
; load a new pattern in ; load a new pattern in
jsr pt3_set_pattern ;6+? jsr pt3_set_pattern ;6+?