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, 39 deletions

diff --git a/src/effects/shaders_ng/displace.frag b/src/effects/shaders_ng/displace.frag
deleted file mode 100644
index df6bc78..0000000
--- a/src/effects/shaders_ng/displace.frag
+++ /dev/null
@@ -1,39 +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 displacement;
-    float xPixel;
-    float yPixel;
-};
-
-layout(binding = 1) uniform sampler2D source;
-layout(binding = 2) uniform sampler2D displacementSource;
-
-float linearstep(float e0, float e1, float x)
-{
-    return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
-}
-
-void main()
-{
-    vec4 offset = texture(displacementSource, qt_TexCoord0);
-    offset.xy -= vec2(0.5, 0.5);
-    offset.xy = offset.xy * step(vec2(1.0/256.0), abs(offset.xy));
-    vec2 tx = qt_TexCoord0 + (vec2(-offset.x, offset.y) * displacement);
-
-    float e1 = linearstep(0.0, xPixel, tx.x);
-    float e2 = linearstep(0.0, yPixel, tx.y);
-    float e3 = 1.0 - linearstep(1.0, 1.0 + xPixel, tx.x);
-    float e4 = 1.0 - linearstep(1.0, 1.0 + yPixel, tx.y);
-
-    vec4 samp = texture(source, tx);
-    samp.rgb *= e1 * e2 * e3 * e4;
-    fragColor = samp * qt_Opacity * offset.a;
-}