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climb: work on 3d positioning optimization
This commit is contained in:
Vince Weaver
parent
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commit
cdfb5cbefe
@ -21,17 +21,20 @@
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; Y is save slot
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hgr_draw_sprite_bg_mask:
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lda #1
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sta save_valid,Y
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;===================================
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; save info on background to restore
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lda #1 ; can't inc as inc,Y not possible
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sta save_valid,Y
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lda CURSOR_X
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sta save_xstart,Y
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lda CURSOR_Y
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sta save_ystart,Y
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;==================================
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; calculate end of sprite on screen for Xpos loop
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; also save for background restore
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@ -41,6 +44,7 @@ hgr_draw_sprite_bg_mask:
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sta hdsb_width_smc+1
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sta save_xend,Y
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;================================
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; calculate bottom of sprite for Ypos loop
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; also save for background restore
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@ -50,14 +54,11 @@ hgr_draw_sprite_bg_mask:
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adc CURSOR_Y
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sta save_yend,Y
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; set up mask countdown value
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lda #0
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sta MASK_COUNTDOWN
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;================================
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; calculate peasant priority
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; based on head location
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; see chart later
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; in theory only need to do this if PEASANT_Y changes
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lda CURSOR_Y
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sec
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@ -69,6 +70,7 @@ hgr_draw_sprite_bg_mask:
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adc #2
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sta PEASANT_PRIORITY
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;==================================
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; set up sprite pointers
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lda peasant_sprites_data_l,X
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sta h728_smc1+1
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@ -77,6 +79,7 @@ hgr_draw_sprite_bg_mask:
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sta h728_smc1+2
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sta h728_smc2+2
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;==================================
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; set up mask pointers
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lda peasant_mask_data_l,X
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sta h728_smc3+1
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@ -87,24 +90,30 @@ hgr_draw_sprite_bg_mask:
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;===============================
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; main loop
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; X = row counter at times (CURRENT_ROW is real one)
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; X = sprite pointer
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; Y = col counter
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ldx #0 ; X is sprite counter
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stx CURRENT_ROW ; zero row counter
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ldx #0 ; reset sprite pointer
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stx CURRENT_ROW ; also zero out row counter
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hgr_sprite_bm_yloop:
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lda MASK_COUNTDOWN ; FIXME is this same as CURRENT_ROW
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; we need to re-calculate masks every 4th row
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lda CURRENT_ROW
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and #$3 ; only update every 4th
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bne mask_good
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;======================
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; recalculate mask
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; assume max width 3? This might change some day...
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txa
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pha ; save sprite counter
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mask_recalc:
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txa ; save sprite pointer
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pha
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lda CURRENT_ROW
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clc
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@ -115,7 +124,7 @@ hgr_sprite_bm_yloop:
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; FIXME: we have multi-width now
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jsr update_bg_mask
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pla ; restore sprite counter
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pla ; restore sprite pointer
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tax
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mask_good:
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@ -145,9 +154,7 @@ mask_good:
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hsbm_inner_loop:
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lda MASK
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lda MASK0
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bne draw_sprite_skip
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;============================
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@ -234,7 +241,7 @@ hdsb_width_smc:
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inc MASK_COUNTDOWN ; increment row
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; inc MASK_COUNTDOWN ; increment row
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inc CURRENT_ROW
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lda CURRENT_ROW
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@ -249,17 +256,24 @@ hdsb_ysize_smc:
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;===================
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; update_bg_mask
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;===================
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; updates the drawing mask for 3d positioning
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; based on colors on lo-res screen
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;
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; need to convert hi-res co-ords to lo-res coords
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; xpos already the same
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; ypos need to divide by four
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; then need to get top/bottom nibble
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; rrrr rtii top 5 bits row, bit 2 top/bottom
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; Column (xpos/7) in Y
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; Row in X
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; updates MASK
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; updates MASK0..MASK2
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update_bg_mask:
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; ?????????
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; rrrr rtii top 5 bits row, bit 2 top/bottom
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sty xsave
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sty xsave ; save xpos
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mask_try_again:
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stx ysave
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stx ysave ; save ypos
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txa
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and #$04 ; see if odd/even in the lo-res lookup
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@ -306,20 +320,20 @@ bg_mask_mask:
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; get high/low properly
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ldy MASK
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cpy #$f0
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bne mask_bottom
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; cpy #$f0
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; bne mask_bottom
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bpl mask_bottom
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mask_top:
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lsr
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lsr
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lsr
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lsr
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jmp mask_mask_mask
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; jmp mask_mask_mask
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mask_bottom:
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and #$0f
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and #$0f ; ok to always do this?
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mask_mask_mask:
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sta MASK
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sta MASK0
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; special cases?
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@ -351,12 +365,12 @@ mask_not_zero:
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mask_true:
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lda #$ff
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sta MASK
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sta MASK0
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rts
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mask_false:
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lda #$00
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sta MASK
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sta MASK0
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rts
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@ -57,9 +57,12 @@ GBASL = $26
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GBASH = $27
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BASL = $28
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BASH = $29
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MASK = $2E
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MASK_COUNTDOWN = $2F
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PEASANT_PRIORITY = $30
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MASK = $2E ; used many places
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MASK0 = $2F ; used by priority code in bg_mask
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MASK1 = $30
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MASK2 = $31
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PEASANT_PRIORITY = $32
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SEEDL = $4E
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SEEDH = $4F
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