mirror of
https://github.com/SourMesen/Mesen2.git
synced 2025-04-02 10:21:44 -04:00
115 lines
2.8 KiB
Lua
115 lines
2.8 KiB
Lua
-----------------------
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-- Name: Modify Screen
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-- Author: spiiin
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-----------------------
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-- Alters the screen buffer to create various video filters
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-- Press 0 to 4 to select a filter
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-----------------------
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shaderType = 0
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frameCount = 0
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function getCurrentFrame()
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frameCount = frameCount + 1
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return frameCount
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end
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function makeRed()
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local buffer = emu.getScreenBuffer()
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for i = 1, #buffer do
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buffer[i] = buffer[i] & 0xFFFF0000
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end
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emu.setScreenBuffer(buffer)
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end
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function onlyOddLines()
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local size = emu.getScreenSize()
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local buffer = emu.getScreenBuffer()
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for i = 0, size.height - 1 do
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if i % 2 == 0 then
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local start = i * size.width
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for j = 1, size.width do
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buffer[start + j] = 0x00000000
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end
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end
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end
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emu.setScreenBuffer(buffer)
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end
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function blink()
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local buffer = emu.getScreenBuffer()
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local frame = getCurrentFrame()
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local blinkPeriod = 24*5
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local blinkTime = 10
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if frame % blinkPeriod < blinkTime then
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for i = 1, #buffer do
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buffer[i] = 0x0000FF00
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end
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end
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emu.setScreenBuffer(buffer)
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end
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function waves()
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local frame = getCurrentFrame()
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local maxWave = 40
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local waveSpeed = 4
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local anim = (frame // waveSpeed % maxWave)
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local animTable = {
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-10,-9,-8,-7,-6,-5,-4,-3,-2,-1,
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0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
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10, 9, 8, 7, 6, 5, 4, 3, 2, 1,
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0,-1,-2,-3,-4,-5,-6,-7,-8,-9,
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}
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anim = animTable[anim+1]
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local width = emu.getScreenSize().width
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local buffer = emu.getScreenBuffer()
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local buffer2 = emu.getScreenBuffer()
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for i = 1, #buffer do
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local x = i % width
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local y = i // width
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if y % 2 == 0 then
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buffer[i] = buffer2[i+anim]
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else
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buffer[i] = buffer2[i-anim]
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end
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end
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emu.setScreenBuffer(buffer)
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end
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function endFrame()
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if shaderType == 1 then
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makeRed()
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elseif shaderType == 2 then
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onlyOddLines()
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elseif shaderType == 3 then
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blink()
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elseif shaderType == 4 then
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waves()
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end
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end
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function checkKeys()
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if emu.isKeyPressed("0") and shaderType ~= 0 then
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shaderType = 0
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emu.displayMessage("Info", "No shader selected")
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elseif emu.isKeyPressed("1") and shaderType ~= 1 then
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shaderType = 1
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emu.displayMessage("Info", "Shader Red selected")
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elseif emu.isKeyPressed("2") and shaderType ~= 2 then
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shaderType = 2
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emu.displayMessage("Info", "Shader OddLines selected")
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elseif emu.isKeyPressed("3") and shaderType ~= 3 then
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shaderType = 3
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emu.displayMessage("Info", "Shader Blink selected")
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elseif emu.isKeyPressed("4") and shaderType ~= 4 then
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shaderType = 4
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emu.displayMessage("Info", "Shader Waves selected")
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end
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end
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emu.addEventCallback(endFrame, emu.eventType.endFrame)
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emu.addEventCallback(checkKeys, emu.eventType.inputPolled)
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local infoStr = "Press keys from 0 to 4 to change shaders"
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emu.displayMessage("Info", infoStr)
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emu.log(infoStr)
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