Created
August 31, 2019 15:22
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Love2D shader for waves (very much WIP)
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local WIDTH = 800 | |
local HEIGHT = 600 | |
local shader_code = [[ | |
extern vec2 screen_dims; | |
extern number time; | |
number pi = atan(1.0) * 4.0; | |
vec4 effect(vec4 color, Image image, vec2 uvs, vec2 screen_coords) { | |
vec2 screen_coords_norm = vec2( | |
screen_coords.x / screen_dims.x, | |
screen_coords.y / screen_dims.y | |
); | |
number y = 40 + sin(4.18 + 1.9 * time + pi * 8.3 * screen_coords_norm.x) * 10 + | |
sin(screen_coords_norm.x * pi + time * 0.5) * cos(1.33 + pi * screen_coords_norm.x + pi * 0.7 * time) * 5; | |
number y2 = 33 + y + sin(3.58 + 1.6 * time + pi * 5.2 * screen_coords_norm.x) * 11 + | |
sin(time * 0.9) * cos(2.33 + pi * screen_coords_norm.x + pi * 1.9 * time) * 6; | |
number y3 = 37 + y2 + sin(1.88 + 1.7 * time + pi * 6.5 * screen_coords_norm.x) * 12 + | |
sin(time * 0.95) * cos(2.33 + pi * 2 * screen_coords_norm.x + pi * 1.2 * time) * 8; | |
number y4 = 38 + y3 + sin(9.66 + 1.4 * time + pi * 5.1 * screen_coords_norm.x) * 10 + | |
sin(time) * cos(5.33 + pi * 2 * screen_coords_norm.x + pi * 1.2 * time) * 12; | |
number y5 = 44 + y4 + sin(1.66 + 2.4 * time + pi * 3.9 * screen_coords_norm.x) * 8 + | |
sin(time * 0.8) * cos(1.88 + pi * 2.3 * screen_coords_norm.x + pi * 1.9 * time) * 11; | |
number y6 = 37 + y5 + sin(2.11 + 3.0 * time + pi * 2.7 * screen_coords_norm.x) * 5 + | |
sin(time * 0.82) * cos(6.19 + pi * 3.33 * screen_coords_norm.x + pi * 2.4 * time) * 14; | |
if (screen_coords.y < screen_dims.y - y6) { | |
return vec4(0.0, 0.0, 0.6, 1.0); | |
} else if (screen_coords.y < screen_dims.y - y5) { | |
return vec4(0.0, 0.0, 0.65, 1.0); | |
} else if (screen_coords.y < screen_dims.y - y4) { | |
return vec4(0.0, 0.0, 0.7, 1.0); | |
} else if (screen_coords.y < screen_dims.y - y3) { | |
return vec4(0.0, 0.0, 0.75, 1.0); | |
} else if (screen_coords.y < screen_dims.y - y2) { | |
return vec4(0.0, 0.0, 0.8, 1.0); | |
} else if (screen_coords.y < screen_dims.y - y) { | |
return vec4(0.0, 0.0, 0.85, 1.0); | |
} else { | |
return vec4(0.0, 0.0, 0.9, 1.0); | |
} | |
} | |
]] | |
function love.load() | |
-- image_data = love.image.newImageData(WIDTH, HEIGHT) | |
-- image = love.graphics.newImage(image_data) | |
shader = love.graphics.newShader(shader_code) | |
end | |
local t = 0 | |
function love.update(dt) | |
t = t + dt | |
shader:send("time", t) | |
end | |
function love.draw() | |
love.graphics.setShader(shader) | |
shader:send("screen_dims", { | |
love.graphics.getWidth(), | |
love.graphics.getHeight() | |
}) | |
love.graphics.rectangle('fill', 0, 0, WIDTH, HEIGHT) | |
love.graphics.setShader() | |
end | |
function love.keypressed(k) | |
if k == "r" then love.event.quit "restart" end | |
end |
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