53 lines
1.0 KiB
GLSL
53 lines
1.0 KiB
GLSL
#version 430
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layout (binding = 0) uniform sampler2D sprite;
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layout (location = 0) in vec4 color;
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layout (location = 1) in vec2 uv;
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layout (location = 0) out vec4 texel;
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layout (binding = 0) uniform Effect {
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float screen_width;
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float screen_height;
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float time;
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};
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vec3 scanline(vec2 coord, vec3 screen)
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{
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screen.rgb -= sin((coord.y + (time * 29.0))) * 0.02;
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return screen;
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}
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vec2 crt(vec2 coord, float bend)
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{
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// put in symmetrical coords
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coord = (coord - 0.5) * 2.0;
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coord *= 1.0;
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// deform coords
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coord.x *= 1.0 + pow((abs(coord.y) / bend), 2.0);
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coord.y *= 1.0 + pow((abs(coord.x) / bend), 2.0);
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// transform back to 0.0 - 1.0 space
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coord = (coord / 2.0) + 0.5;
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return coord;
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}
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void main()
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{
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vec2 crtCoords = crt(uv, 4.8);
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// Split the color channels
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texel.rgb = texture(sprite, crtCoords).rgb;
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texel.a = 1;
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// HACK: this bend produces a shitty moire pattern.
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// Up the bend for the scanline
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vec2 screenSpace = crtCoords * vec2(screen_width, screen_height);
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texel.rgb = scanline(screenSpace, texel.rgb);
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}
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