Created
December 19, 2018 19:16
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#!/usr/bin/env stack | |
{- stack script --resolver lts-12.24 --package sdl2 -} | |
import Control.Concurrent | |
import SDL | |
main :: IO () | |
main = do | |
initialize [InitVideo] | |
window <- createWindow mempty defaultWindow | |
renderer <- createRenderer window (-1) defaultRenderer | |
-- Draw a blue background | |
rendererDrawColor renderer $= V4 0 0 255 255 | |
clear renderer | |
-- Draw a green rectangle outline to a 100x60 texture | |
rectTexture <- createTexture renderer RGBA8888 TextureAccessTarget (V2 100 60) | |
rendererRenderTarget renderer $= Just rectTexture | |
rendererDrawColor renderer $= V4 0 255 0 255 | |
drawRect renderer Nothing | |
-- Copy the rectangle texture on top | |
rendererRenderTarget renderer $= Nothing | |
copyEx renderer rectTexture Nothing | |
(Just (Rectangle (P (V2 100 100)) (V2 100 60))) 45 Nothing (V2 False False) | |
-- Behold, it is black on the inside | |
present renderer | |
threadDelay 1000000 |
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textureBlendMode rectTexture $= BlendAlphaBlend