Remove qtgraphicaleffects sources and add note about its state in Qt 6HEADdev

Add a README.md mentioning the documentation on where the ported
effects can be found, as well as how to check out the Qt5 branch.

Pick-to: 6.2
Fixes: QTBUG-95757
Change-Id: Ib47c7e73f8622c8e287df0f74c6f16a5113b357e
Reviewed-by: Tor Arne Vestbø <[email protected]>
Reviewed-by: Volker Hilsheimer <[email protected]>

1 files changed, 0 insertions, 22 deletions

diff --git a/src/effects/shaders_ng/gammaadjust.frag b/src/effects/shaders_ng/gammaadjust.frag
deleted file mode 100644
index 0a1175a..0000000
--- a/src/effects/shaders_ng/gammaadjust.frag
+++ /dev/null
@@ -1,22 +0,0 @@
-#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;
-}