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, 72 deletions

diff --git a/src/effects/shaders_ng/colorize.frag b/src/effects/shaders_ng/colorize.frag
deleted file mode 100644
index a109a45..0000000
--- a/src/effects/shaders_ng/colorize.frag
+++ /dev/null
@@ -1,72 +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 hue;
-    float saturation;
-    float lightness;
-};
-
-layout(binding = 1) uniform sampler2D source;
-
-float RGBtoL(vec3 color)
-{
-    float cmin = min(color.r, min(color.g, color.b));
-    float cmax = max(color.r, max(color.g, color.b));
-    float l = (cmin + cmax) / 2.0;
-    return l;
-}
-
-float hueToIntensity(float v1, float v2, float h)
-{
-    h = fract(h);
-    if (h < 1.0 / 6.0)
-        return v1 + (v2 - v1) * 6.0 * h;
-    else if (h < 1.0 / 2.0)
-        return v2;
-    else if (h < 2.0 / 3.0)
-        return v1 + (v2 - v1) * 6.0 * (2.0 / 3.0 - h);
-
-    return v1;
-}
-
-vec3 HSLtoRGB(vec3 color)
-{
-    float h = color.x;
-    float l = color.z;
-    float s = color.y;
-
-    if (s < 1.0 / 256.0)
-        return vec3(l, l, l);
-
-    float v1;
-    float v2;
-    if (l < 0.5)
-        v2 = l * (1.0 + s);
-    else
-        v2 = (l + s) - (s * l);
-
-    v1 = 2.0 * l - v2;
-
-    float d = 1.0 / 3.0;
-    float r = hueToIntensity(v1, v2, h + d);
-    float g = hueToIntensity(v1, v2, h);
-    float b = hueToIntensity(v1, v2, h - d);
-    return vec3(r, g, b);
-}
-
-void main()
-{
-    vec4 samp = texture(source, qt_TexCoord0);
-    samp = vec4(samp.rgb / max(1.0/256.0, samp.a), samp.a);
-    float light = RGBtoL(samp.rgb);
-    float c = step(0.0, lightness);
-    samp.rgb = HSLtoRGB(vec3(hue, saturation, mix(light, c, abs(lightness))));
-    fragColor = vec4(samp.rgb * samp.a, samp.a) * qt_Opacity;
-}