1 files changed, 22 insertions, 0 deletions
diff --git a/src/effects/shaders_ng/gammaadjust.frag b/src/effects/shaders_ng/gammaadjust.frag
new file mode 100644
index 0000000..0a1175a
--- /dev/null
+++ b/src/effects/shaders_ng/gammaadjust.frag
@@ -0,0 +1,22 @@
+#version 440
+
+layout(location = 0) in vec2 qt_TexCoord0;
+layout(location = 0) out vec4 fragColor;
+
+layout(std140, binding = 0) uniform buf {
+    // qt_Matrix and qt_Opacity must always be both present
+    // if the built-in vertex shader is used.
+    mat4 qt_Matrix;
+    float qt_Opacity;
+    float gamma;
+};
+
+layout(binding = 1) uniform sampler2D source;
+
+void main()
+{
+    vec4 originalColor = texture(source, qt_TexCoord0.st);
+    originalColor.rgb = originalColor.rgb / max(1.0/256.0, originalColor.a);
+    vec3 adjustedColor = pow(originalColor.rgb, vec3(gamma));
+    fragColor = vec4(adjustedColor * originalColor.a, originalColor.a) * qt_Opacity;
+}