1 files changed, 14 insertions, 0 deletions
diff --git a/src/effects/shaders/brightnesscontrast.frag b/src/effects/shaders/brightnesscontrast.frag
new file mode 100644
index 0000000..4a3d435
--- /dev/null
+++ b/src/effects/shaders/brightnesscontrast.frag
@@ -0,0 +1,14 @@
+varying mediump vec2 qt_TexCoord0;
+uniform highp float qt_Opacity;
+uniform lowp sampler2D source;
+uniform highp float brightness;
+uniform highp float contrast;
+void main() {
+    highp vec4 pixelColor = texture2D(source, qt_TexCoord0);
+    pixelColor.rgb /= max(1.0/256.0, pixelColor.a);
+    highp float c = 1.0 + contrast;
+    highp float contrastGainFactor = 1.0 + c * c * c * c * step(0.0, contrast);
+    pixelColor.rgb = ((pixelColor.rgb - 0.5) * (contrastGainFactor * contrast + 1.0)) + 0.5;
+    pixelColor.rgb = mix(pixelColor.rgb, vec3(step(0.0, brightness)), abs(brightness));
+    gl_FragColor = vec4(pixelColor.rgb * pixelColor.a, pixelColor.a) * qt_Opacity;
+}