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tweak
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@ -4,6 +4,12 @@
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%import test_stack
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%zeropage basicsafe
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; note: The flickering in the scrolling is caused by the CPU requiring
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; too long to scroll the characters + the colors in course scroll.
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; This takes nearly a full frame to accomplish, and causes tearing.
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; It's very difficult to remove this flicker: it requires double buffering
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; and splitting the coarse character scrolling on multiple phases...
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main {
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ubyte perform_scroll = false
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@ -17,7 +23,7 @@ main {
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c64.SCROLX &= %11110111 ; 38 column mode
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c64.set_rasterirq(40) ; enable animation
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c64.set_rasterirq(200) ; enable animation
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ubyte target_height = 10
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ubyte active_height = 24
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@ -123,10 +129,10 @@ spritedata $0f00 {
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irq {
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ubyte smoothx=7
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ubyte smoothx=0
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sub irq() {
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smoothx = (smoothx-1) & 7
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main.perform_scroll = smoothx==0
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main.perform_scroll = smoothx==7
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c64.SCROLX = (c64.SCROLX & %11111000) | smoothx
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}
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}
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