1 files changed, 0 insertions, 63 deletions
diff --git a/src/opengl/util/ellipse_functions.glsl b/src/opengl/util/ellipse_functions.glsl
deleted file mode 100644
index eed18e8..0000000
--- a/src/opengl/util/ellipse_functions.glsl
+++ /dev/null
@@ -1,63 +0,0 @@
-uniform vec3 inv_matrix_m0;
-uniform vec3 inv_matrix_m1;
-uniform vec3 inv_matrix_m2;
-
-uniform vec2 ellipse_offset;
-
-float ellipse()
-{
-    vec2 st = gl_TexCoord[0].st;
-
-    if (dot(st, st) > 1)
-        discard;
-
-    return 1.0;
-}
-
-// ellipse equation
-
-// s^2/a^2 + t^2/b^2 = 1
-//
-// implicit equation:
-// g(s,t) = 1 - s^2/r_s^2 - t^2/r_t^2
-
-// distance from ellipse:
-// grad = [dg/dx dg/dy]
-// d(s, t) ~= g(s, t) / |grad|
-
-// dg/dx = dg/ds * ds/dx + dg/dt * dt/dx
-// dg/dy = dg/ds * ds/dy + dg/dt * dt/dy
-
-float ellipse_aa()
-{
-    mat3 mat;
-
-    mat[0] = inv_matrix_m0;
-    mat[1] = inv_matrix_m1;
-    mat[2] = inv_matrix_m2;
-
-    vec3 hcoords = mat * vec3(gl_FragCoord.xy + ellipse_offset, 1);
-    float inv_w = 1.0 / hcoords.z;
-    vec2 st = hcoords.xy * inv_w;
-
-    vec4 xy = vec4(mat[0].xy, mat[1].xy); 
-    vec2 h = vec2(mat[0].z, mat[1].z);
-
-    vec4 dstdxy = (xy.xzyw - h.xyxy * st.xxyy) * inv_w;
- 
-    //dstdxy.x = (mat[0].x - mat[0].z * st.x) * inv_w; // ds/dx
-    //dstdxy.y = (mat[1].x - mat[1].z * st.x) * inv_w; // ds/dy
-    //dstdxy.z = (mat[0].y - mat[0].z * st.y) * inv_w; // dt/dx
-    //dstdxy.w = (mat[1].y - mat[1].z * st.y) * inv_w; // dt/dy
-
-    vec2 inv_r = gl_TexCoord[0].xy;
-    vec2 n = st * inv_r;
-    float g = 1.0 - dot(n, n);
-
-    vec2 dgdst = -2.0 * n * inv_r; 
-
-    vec2 grad = vec2(dot(dgdst, dstdxy.xz),
-                     dot(dgdst, dstdxy.yw));
-
-    return smoothstep(-0.5, 0.5, g * inversesqrt(dot(grad, grad)));
-}