1 files changed, 22 insertions, 0 deletions
diff --git a/src/quickshapes/shaders_ng/lineargradient.vert b/src/quickshapes/shaders_ng/lineargradient.vert
new file mode 100644
index 0000000000..b4eb868186
--- /dev/null
+++ b/src/quickshapes/shaders_ng/lineargradient.vert
@@ -0,0 +1,22 @@
+#version 440
+
+layout(location = 0) in vec4 vertexCoord;
+layout(location = 1) in vec4 vertexColor;
+
+layout(location = 0) out float gradTabIndex;
+
+layout(std140, binding = 0) uniform buf {
+    mat4 matrix;
+    vec2 gradStart;
+    vec2 gradEnd;
+    float opacity;
+} ubuf;
+
+out gl_PerVertex { vec4 gl_Position; };
+
+void main()
+{
+    vec2 gradVec = ubuf.gradEnd - ubuf.gradStart;
+    gradTabIndex = dot(gradVec, vertexCoord.xy - ubuf.gradStart) / (gradVec.x * gradVec.x + gradVec.y * gradVec.y);
+    gl_Position = ubuf.matrix * vertexCoord;
+}