Improve the sun shader with the help of AI

1 files changed, 18 insertions, 9 deletions

diff --git a/themes/src/_shaders/sun.vert b/themes/src/_shaders/sun.vert
index 76150f0..5ed77d7 100644
--- a/themes/src/_shaders/sun.vert
+++ b/themes/src/_shaders/sun.vert
@@ -1,13 +1,22 @@
 
-attribute vec2 position; 
-attribute vec4 color; 
-attribute mat4 vMatrix; 
-uniform mat4 projection; 
-uniform mat4 model; 
+attribute vec2 position;
+attribute vec4 color;
+attribute mat4 vMatrix;
+uniform mat4 projection;
+uniform mat4 model;
 varying lowp vec4 VertexColor;
+varying lowp vec2 TexCoord;
 
-void main() { 
-    vec4 fragmentPosition = projection * model * vMatrix * vec4(position.x, position.y, 0, 1); 
-    gl_Position = fragmentPosition; 
-    VertexColor = color; 
+void main() {
+    vec4 fragmentPosition = projection * model * vMatrix * vec4(position.x, position.y, 0, 1);
+    gl_Position = fragmentPosition;
+    VertexColor = color;
+    // Normalize the position - the center is at (0,0) and edge vertices are at distance 'radius'
+    // We want TexCoord to be in the range roughly [-1, 1] at the edges
+    lowp float maxDist = length(position);
+    if (maxDist > 0.1) {
+        TexCoord = position / maxDist;
+    } else {
+        TexCoord = vec2(0.0, 0.0);
+    }
 }