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Updated Image Processing shader and GUI: gamma color processing follows

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HSV transform. new Shader assignment operator.
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brunoherbelin
2020-06-06 17:59:21 +02:00
parent 000728b708
commit 4261dedff1
10 changed files with 68 additions and 22 deletions
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8
rsc/shaders/imageprocessing.fs
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@@ -326,9 +326,8 @@ void main(void)
// chromakey
alpha -= mix( 0.0, 1.0 - alphachromakey( transformedRGB, chromakey.rgb, chromadelta), float(chromadelta > 0.0001) );
// color transformation
// brightness and contrast transformation
transformedRGB = mix(vec3(0.62), transformedRGB, contrast + 1.0) + brightness;
transformedRGB = LevelsControl(transformedRGB, levels.x, gamma.rgb * gamma.a, levels.y, levels.z, levels.w);
// RGB invert
transformedRGB = vec3(float(invert==1)) + ( transformedRGB * vec3(1.0 - 2.0 * float(invert==1)) );
@@ -352,11 +351,14 @@ void main(void)
alpha -= mix( 0.0, step( transformedHSL.z, lumakey ), float(lumakey > EPSILON));
// level threshold
transformedHSL = mix( transformedHSL, vec3(0.0, 0.0, step( transformedHSL.z, threshold )), float(threshold > EPSILON));
transformedHSL = mix( transformedHSL, vec3(0.0, 0.0, 0.95 - step( transformedHSL.z, threshold )), float(threshold > EPSILON));
// after operations on HSL, convert back to RGB
transformedRGB = HSV2RGB(transformedHSL);
// apply gamma correction
transformedRGB = LevelsControl(transformedRGB, levels.x, gamma.rgb * gamma.a, levels.y, levels.z, levels.w);
// apply base color and alpha for final fragment color
FragColor = vec4(transformedRGB * vertexColor.rgb * color.rgb, clamp(alpha, 0.0, 1.0) );