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, 21 deletions

diff --git a/src/effects/shaders_ng/desaturate.frag b/src/effects/shaders_ng/desaturate.frag
deleted file mode 100644
index b54b3ac..0000000
--- a/src/effects/shaders_ng/desaturate.frag
+++ /dev/null
@@ -1,21 +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 desaturation;
-};
-
-layout(binding = 1) uniform sampler2D source;
-
-void main(void)
-{
-    vec4 textureColor = texture(source, qt_TexCoord0.st);
-    float grayColor = (textureColor.r + textureColor.g + textureColor.b) / 3.0;
-    fragColor = mix(textureColor, vec4(vec3(grayColor), textureColor.a), desaturation) * qt_Opacity;
-}