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, 31 deletions

diff --git a/src/effects/shaders_ng/lineargradient.vert b/src/effects/shaders_ng/lineargradient.vert
deleted file mode 100644
index cd8f8a8..0000000
--- a/src/effects/shaders_ng/lineargradient.vert
+++ /dev/null
@@ -1,31 +0,0 @@
-#version 440
-
-layout(location = 0) in vec4 qt_Vertex;
-layout(location = 1) in vec2 qt_MultiTexCoord0;
-
-layout(location = 0) out vec2 qt_TexCoord0;
-layout(location = 1) out vec2 qt_TexCoord1;
-
-layout(std140, binding = 0) uniform buf {
-    mat4 qt_Matrix;
-    float qt_Opacity;
-    vec2 startPoint;
-    vec2 matrixData;
-    float l;
-};
-
-out gl_PerVertex { vec4 gl_Position; };
-
-void main()
-{
-    mat2 rot = mat2(matrixData.y, -matrixData.x,
-                    matrixData.x,  matrixData.y);
-
-    qt_TexCoord0 = qt_MultiTexCoord0;
-
-    qt_TexCoord1 = qt_MultiTexCoord0 * l;
-    qt_TexCoord1 -= startPoint * l;
-    qt_TexCoord1 *= rot;
-
-    gl_Position = qt_Matrix * qt_Vertex;
-}