Repo created

libs/shaders/GL/traffic_circle.vsh.glsl

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+layout (location = 0) in vec4 a_position;
+layout (location = 1) in vec4 a_normal;
+layout (location = 2) in vec2 a_colorTexCoord;
+
+layout (location = 0) out vec2 v_colorTexCoord;
+layout (location = 1) out vec3 v_radius;
+
+layout (binding = 0) uniform UBO
+{
+  mat4 u_modelView;
+  mat4 u_projection;
+  mat4 u_pivotTransform;
+  vec4 u_trafficParams;
+  vec4 u_outlineColor;
+  vec4 u_lightArrowColor;
+  vec4 u_darkArrowColor;
+  float u_outline;
+  float u_opacity;
+};
+
+void main()
+{
+  vec2 normal = a_normal.xy;
+  vec2 transformedAxisPos = (vec4(a_position.xy, 0.0, 1.0) * u_modelView).xy;
+  int index = int(a_position.w);
+  float leftSize = u_lightArrowColor[index];
+  float rightSize = u_darkArrowColor[index];
+  if (dot(normal, normal) != 0.0)
+  {
+    // offset by normal = rightVec * (rightSize - leftSize) / 2
+    vec2 norm = normal * 0.5 * (rightSize - leftSize);
+    transformedAxisPos = calcLineTransformedAxisPos(transformedAxisPos, a_position.xy + norm,
+                                                    u_modelView, length(norm));
+  }
+  // radius = (leftSize + rightSize) / 2
+  v_radius = vec3(a_normal.zw, 1.0) * 0.5 * (leftSize + rightSize);
+  vec2 finalPos = transformedAxisPos + v_radius.xy;
+  v_colorTexCoord = a_colorTexCoord;
+  vec4 pos = vec4(finalPos, a_position.z, 1.0) * u_projection;
+  gl_Position = applyPivotTransform(pos, u_pivotTransform, 0.0);
+}