Add an own copy of RectangularGlow, with OpenGL core and D3D12 as well

Change-Id: I0231854ae93cb3f45ea5da13c30c08fdc1b29139
Reviewed-by: J-P Nurmi <jpnurmi@qt.io>

3 files changed, 65 insertions, 0 deletions

diff --git a/src/imports/controls/material/shaders/+glslcore/RectangularGlow.frag b/src/imports/controls/material/shaders/+glslcore/RectangularGlow.frag
new file mode 100644
index 00000000..432d86b5
--- /dev/null
+++ b/src/imports/controls/material/shaders/+glslcore/RectangularGlow.frag
@@ -0,0 +1,25 @@
+#version 150
+
+uniform float qt_Opacity;
+uniform float relativeSizeX;
+uniform float relativeSizeY;
+uniform float spread;
+uniform vec4 color;
+
+in vec2 qt_TexCoord0;
+out vec4 fragColor;
+
+float linearstep(float e0, float e1, float x)
+{
+    return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
+}
+
+void main()
+{
+    float alpha =
+        smoothstep(0.0, relativeSizeX, 0.5 - abs(0.5 - qt_TexCoord0.x)) *
+        smoothstep(0.0, relativeSizeY, 0.5 - abs(0.5 - qt_TexCoord0.y));
+
+    float spreadMultiplier = linearstep(spread, 1.0 - spread, alpha);
+    fragColor = color * qt_Opacity * spreadMultiplier * spreadMultiplier;
+}
diff --git a/src/imports/controls/material/shaders/+hlsl/RectangularGlow.frag b/src/imports/controls/material/shaders/+hlsl/RectangularGlow.frag
new file mode 100644
index 00000000..69d9f852
--- /dev/null
+++ b/src/imports/controls/material/shaders/+hlsl/RectangularGlow.frag
@@ -0,0 +1,21 @@
+cbuffer ConstantBuffer : register(b0)
+{
+    float4x4 qt_Matrix;
+    float qt_Opacity;
+    float relativeSizeX;
+    float relativeSizeY;
+    float spread;
+    float4 color;
+}
+
+float linearstep(float e0, float e1, float x) { return clamp((x - e0) / (e1 - e0), 0.0, 1.0); }
+
+float4 main(float4 position : SV_POSITION, float2 coord : TEXCOORD0) : SV_TARGET
+{
+    float alpha =
+        smoothstep(0.0, relativeSizeX, 0.5 - abs(0.5 - coord.x)) *
+        smoothstep(0.0, relativeSizeY, 0.5 - abs(0.5 - coord.y));
+
+    float spreadMultiplier = linearstep(spread, 1.0 - spread, alpha);
+    return color * qt_Opacity * spreadMultiplier * spreadMultiplier;
+}
diff --git a/src/imports/controls/material/shaders/RectangularGlow.frag b/src/imports/controls/material/shaders/RectangularGlow.frag
new file mode 100644
index 00000000..40bab580
--- /dev/null
+++ b/src/imports/controls/material/shaders/RectangularGlow.frag
@@ -0,0 +1,19 @@
+uniform highp float qt_Opacity;
+uniform mediump float relativeSizeX;
+uniform mediump float relativeSizeY;
+uniform mediump float spread;
+uniform lowp vec4 color;
+varying highp vec2 qt_TexCoord0;
+
+highp float linearstep(highp float e0, highp float e1, highp float x) {
+    return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
+}
+
+void main() {
+    lowp float alpha =
+        smoothstep(0.0, relativeSizeX, 0.5 - abs(0.5 - qt_TexCoord0.x)) *
+        smoothstep(0.0, relativeSizeY, 0.5 - abs(0.5 - qt_TexCoord0.y));
+
+    highp float spreadMultiplier = linearstep(spread, 1.0 - spread, alpha);
+    gl_FragColor = color * qt_Opacity * spreadMultiplier * spreadMultiplier;
+}