1 files changed, 24 insertions, 0 deletions
diff --git a/src/opengl/util/ellipse_aa_radial.glsl b/src/opengl/util/ellipse_aa_radial.glsl
new file mode 100644
index 0000000000..0878f9997e
--- /dev/null
+++ b/src/opengl/util/ellipse_aa_radial.glsl
@@ -0,0 +1,24 @@
+#include "ellipse_functions.glsl"
+
+uniform sampler1D palette;
+uniform vec2 fmp;
+uniform float fmp2_m_radius2;
+uniform vec4 inv_matrix;
+uniform vec2 inv_matrix_offset;
+
+void main()
+{
+    //     float2 A = frag_coord.xy;//mul(inv_matrix, frag_coord.xy) + inv_matrix_offset;
+    mat2 mat;
+    mat[0][0] = inv_matrix.x;
+    mat[0][1] = inv_matrix.y;
+    mat[1][0] = inv_matrix.z;
+    mat[1][1] = inv_matrix.w;
+    vec2 A = gl_FragCoord.xy * mat + inv_matrix_offset;
+    vec2 B = fmp;
+    float a = fmp2_m_radius2;
+    float b = 2.0*dot(A, B);
+    float c = -dot(A, A);
+    float val = (-b + sqrt(b*b - 4.0*a*c)) / (2.0*a);
+    gl_FragColor = texture1D(palette, val) * ellipse_aa();
+}