render 3d to tex

assets/shaders/2d-solid.vertex.glsl

@@ -17,6 +17,14 @@ out float frag_softness;
 out float frag_border_radius;
 out float frag_border_thickness;
 out vec4 frag_border_color;
+out vec2 uv;
+
+const vec2 rectangle_uv[4] = vec2[](
+    vec2(0, 1),
+    vec2(0, 0),
+    vec2(1, 1),
+    vec2(1, 0)
+);
 
 const vec2 rectangle_vertices[4] = vec2[](
     vec2(-1, -1),
@@ -44,4 +52,5 @@ void main() {
     frag_border_thickness = border_thickness;
     frag_border_color = border_color;
     frag_softness = edge_softness;
+    uv = rectangle_uv[gl_VertexID];
 }