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Interpolate scrolling in Analogue Mode filter

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I can't really make the filter update only every timestep, because it's
per-pixel and operates on deltaframes too, so it TECHNICALLY runs faster
in over-30-FPS mode than not. That said, it's not really noticeable, the
filter doesn't look bad for updating more often or anything. However, I
can at least interpolate the scrolling, so it's smooth in over-30-FPS
mode.
This commit is contained in:
Misa
2020-11-07 16:21:30 -08:00
committed by Ethan Lee
parent 65a5dbe3a3
commit 1a2dd787f3
1 changed files with 4 additions and 1 deletions
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5
desktop_version/src/GraphicsUtil.cpp
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@@ -316,6 +316,7 @@ void BlitSurfaceTinted(
} }
int oldscrollamount = 0;
int scrollamount = 0; int scrollamount = 0;
bool isscrolling = 0; bool isscrolling = 0;
@@ -326,12 +327,14 @@ void UpdateFilter()
isscrolling = true; isscrolling = true;
} }
oldscrollamount = scrollamount;
if(isscrolling == true) if(isscrolling == true)
{ {
scrollamount += 20; scrollamount += 20;
if(scrollamount > 240) if(scrollamount > 240)
{ {
scrollamount = 0; scrollamount = 0;
oldscrollamount = 0;
isscrolling = false; isscrolling = false;
} }
} }
@@ -348,7 +351,7 @@ SDL_Surface* ApplyFilter( SDL_Surface* _src )
{ {
for(int y = 0; y < _src->h; y++) for(int y = 0; y < _src->h; y++)
{ {
int sampley = (y + scrollamount )% 240; int sampley = (y + (int) graphics.lerp(oldscrollamount, scrollamount) )% 240;
Uint32 pixel = ReadPixel(_src, x,sampley); Uint32 pixel = ReadPixel(_src, x,sampley);