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Fixed grain noise

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This commit is contained in:
Mario Brandao 2023-12-13 23:07:09 +01:00
parent 80dd302a25
commit 77472b3c54
3 changed files with 69 additions and 8 deletions
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9
camera-effects/grain-noise.gdshader
View File

@ -5,18 +5,11 @@ void fragment() {
// Readbackground and foreground images.
vec4 col = texture(SCREEN_TEXTURE, UV);
// Sepia tone, from
// https://www.techrepublic.com/blog/how-do-i/how-do-i-convert-images-to-grayscale-and-sepia-tone-using-c
vec3 sepia = vec3(
col.r * .393 + col.g *.769 + col.b * .189,
col.r * .349 + col.g *.686 + col.b * .168,
col.r * .272 + col.g *.534 + col.b * .131);
// Film grain, from
// https://www.reddit.com/r/opengl/comments/1rr4fy/any_good_ways_of_generating_film_grain_noise
const float noiseStrength = 50.0;
float x = (UV.x + 4.0) * (UV.y + 4.0) * (TIME * 10.0);
vec3 grain = vec3(mod((mod(x, 13.0) + 1.0) * (mod(x, 123.0) + 1.0), 0.01) - 0.005) * noiseStrength;
COLOR = vec4(sepia + grain, 1.0);
COLOR = vec4(col.rgb + grain, 1.0);
}

34
docs/images/camera-effects/grain-noise.png.import Normal file
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@ -0,0 +1,34 @@
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34
docs/images/camera-effects/sepia.png.import Normal file
View File

@ -0,0 +1,34 @@
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