Merge remote-tracking branch 'origin/dev' into wip/scenegraphng

Change-Id: Ib5662d80d5b2f58cf4634c54c054545ba9df807e

1 files changed, 29 insertions, 0 deletions

diff --git a/src/quickshapes/shaders/radialgradient_core.frag b/src/quickshapes/shaders/radialgradient_core.frag
new file mode 100644
index 0000000000..706ce53e4d
--- /dev/null
+++ b/src/quickshapes/shaders/radialgradient_core.frag
@@ -0,0 +1,29 @@
+#version 150 core
+
+uniform sampler2D gradTabTexture;
+uniform float opacity;
+
+uniform vec2 focalToCenter;
+uniform float centerRadius;
+uniform float focalRadius;
+
+in vec2 coord;
+
+out vec4 fragColor;
+
+void main()
+{
+    float rd = centerRadius - focalRadius;
+    float b = 2.0 * (rd * focalRadius + dot(coord, focalToCenter));
+    float fmp2_m_radius2 = -focalToCenter.x * focalToCenter.x - focalToCenter.y * focalToCenter.y + rd * rd;
+    float inverse_2_fmp2_m_radius2 = 1.0 / (2.0 * fmp2_m_radius2);
+    float det = b * b - 4.0 * fmp2_m_radius2 * ((focalRadius * focalRadius) - dot(coord, coord));
+    vec4 result = vec4(0.0);
+    if (det >= 0.0) {
+        float detSqrt = sqrt(det);
+        float w = max((-b - detSqrt) * inverse_2_fmp2_m_radius2, (-b + detSqrt) * inverse_2_fmp2_m_radius2);
+        if (focalRadius + w * (centerRadius - focalRadius) >= 0.0)
+            result = texture(gradTabTexture, vec2(w, 0.5)) * opacity;
+    }
+    fragColor = result;
+}