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Improve bloom effect (#12916)

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* Remove the built-in exposure factor of 2.5
* Add physics-based bloom (https://learnopengl.com/Guest-Articles/2022/Phys.-Based-Bloom)
* Add luminance scaling for bloom layer to simulate HDR
* Add setting to control bloom strength
This commit is contained in:
x2048 2022-11-02 09:09:48 +01:00 • committed by GitHub
parent fb3085a2c5
commit 9b24041394
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15 changed files with 195 additions and 59 deletions
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14
client/shaders/extract_bloom/opengl_fragment.glsl
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@ -2,7 +2,7 @@
uniform sampler2D rendered;
uniform mediump float exposureFactor;
uniform float bloomLuminanceThreshold;
uniform mediump float bloomStrength;
#ifdef GL_ES
varying mediump vec2 varTexCoord;
@ -14,8 +14,14 @@ centroid varying vec2 varTexCoord;
void main(void)
{
vec2 uv = varTexCoord.st;
vec4 color = texture2D(rendered, uv).rgba;
vec3 color = texture2D(rendered, uv).rgb;
// translate to linear colorspace (approximate)
color.rgb = pow(color.rgb, vec3(2.2)) * exposureFactor;
gl_FragColor = vec4(color.rgb, 1.0); // force full alpha to avoid holes in the image.
color = pow(color, vec3(2.2));
// Scale colors by luminance to amplify bright colors
// in SDR textures.
float luminance = dot(color, vec3(0.213, 0.515, 0.072));
luminance *= luminance;
color *= luminance * exposureFactor * bloomStrength;
gl_FragColor = vec4(color, 1.0); // force full alpha to avoid holes in the image.
}