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Greyscale in glsl
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| float contrast(float mValue, float mScale, float mMidPoint) { | |
| return clamp( (mValue - mMidPoint) * mScale + mMidPoint, 0.0, 1.0); | |
| } | |
| float contrast(float mValue, float mScale) { | |
| return contrast(mValue, mScale, .5); | |
| } | |
| vec3 contrast(vec3 mValue, float mScale, float mMidPoint) { | |
| return vec3( contrast(mValue.r, mScale, mMidPoint), contrast(mValue.g, mScale, mMidPoint), contrast(mValue.b, mScale, mMidPoint) ); | |
| } | |
| vec3 contrast(vec3 mValue, float mScale) { | |
| return contrast(mValue, mScale, .5); | |
| } |
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| void main(void) { | |
| vec4 color = texture2D(uSampler0, vTextureCoord); | |
| float gray = dot(color.rgb, vec3(0.299, 0.587, 0.114)); | |
| gl_FragColor = vec4(vec3(gray), 1.0); | |
| } |
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