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 <tor.arne.vestbo@qt.io>
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

1 files changed, 0 insertions, 47 deletions

diff --git a/src/effects/shaders_ng/leveladjust.frag b/src/effects/shaders_ng/leveladjust.frag
deleted file mode 100644
index d8cde59..0000000
--- a/src/effects/shaders_ng/leveladjust.frag
+++ /dev/null
@@ -1,47 +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;
-    vec3 minimumInputRGB;
-    vec3 maximumInputRGB;
-    float minimumInputAlpha;
-    float maximumInputAlpha;
-    vec3 minimumOutputRGB;
-    vec3 maximumOutputRGB;
-    float minimumOutputAlpha;
-    float maximumOutputAlpha;
-    vec3 gamma;
-};
-
-layout(binding = 1) uniform sampler2D source;
-
-float linearstep(float e0, float e1, float x)
-{
-    return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
-}
-
-void main()
-{
-    vec4 textureColor = texture(source, qt_TexCoord0.st);
-    vec4 color = vec4(textureColor.rgb / max(1.0/256.0, textureColor.a), textureColor.a);
-
-    color.r = linearstep(minimumInputRGB.r, maximumInputRGB.r, color.r);
-    color.g = linearstep(minimumInputRGB.g, maximumInputRGB.g, color.g);
-    color.b = linearstep(minimumInputRGB.b, maximumInputRGB.b, color.b);
-    color.a = linearstep(minimumInputAlpha, maximumInputAlpha, color.a);
-
-    color.rgb = pow(color.rgb, gamma);
-
-    color.r = minimumOutputRGB.r + color.r * (maximumOutputRGB.r - minimumOutputRGB.r);
-    color.g = minimumOutputRGB.g + color.g * (maximumOutputRGB.g - minimumOutputRGB.g);
-    color.b = minimumOutputRGB.b + color.b * (maximumOutputRGB.b - minimumOutputRGB.b);
-    color.a = minimumOutputAlpha + color.a * (maximumOutputAlpha - minimumOutputAlpha);
-
-    fragColor = vec4(color.rgb * color.a, color.a) * qt_Opacity;
-}