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, 40 deletions

diff --git a/src/effects/shaders_ng/fastglow.frag b/src/effects/shaders_ng/fastglow.frag
deleted file mode 100644
index fa19239..0000000
--- a/src/effects/shaders_ng/fastglow.frag
+++ /dev/null
@@ -1,40 +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;
-    vec4 color;
-    float spread;
-    float weight1;
-    float weight2;
-    float weight3;
-    float weight4;
-    float weight5;
-};
-
-layout(binding = 1) uniform sampler2D source1;
-layout(binding = 2) uniform sampler2D source2;
-layout(binding = 3) uniform sampler2D source3;
-layout(binding = 4) uniform sampler2D source4;
-layout(binding = 5) uniform sampler2D source5;
-
-float linearstep(float e0, float e1, float x)
-{
-    return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
-}
-
-void main()
-{
-    vec4 sourceColor = texture(source1, qt_TexCoord0) * weight1;
-    sourceColor += texture(source2, qt_TexCoord0) * weight2;
-    sourceColor += texture(source3, qt_TexCoord0) * weight3;
-    sourceColor += texture(source4, qt_TexCoord0) * weight4;
-    sourceColor += texture(source5, qt_TexCoord0) * weight5;
-    sourceColor = mix(vec4(0), color, linearstep(0.0, spread, sourceColor.a));
-    fragColor = sourceColor * qt_Opacity;
-}