1 files changed, 56 insertions, 0 deletions
diff --git a/src/mbgl/shaders/collision_box.cpp b/src/mbgl/shaders/collision_box.cpp
index 224918c7e8..36e70d0faa 100644
--- a/src/mbgl/shaders/collision_box.cpp
+++ b/src/mbgl/shaders/collision_box.cpp
@@ -10,5 +10,61 @@ const char* collision_box::name = "collision_box";
 const char* collision_box::vertexSource = source() + 14428;
 const char* collision_box::fragmentSource = source() + 15252;
 
+// Uncompressed source of collision_box.vertex.glsl:
+/*
+attribute vec2 a_pos;
+attribute vec2 a_anchor_pos;
+attribute vec2 a_extrude;
+attribute vec2 a_placed;
+
+uniform mat4 u_matrix;
+uniform vec2 u_extrude_scale;
+uniform float u_camera_to_center_distance;
+
+varying float v_placed;
+varying float v_notUsed;
+
+void main() {
+    vec4 projectedPoint = u_matrix * vec4(a_anchor_pos, 0, 1);
+    highp float camera_to_anchor_distance = projectedPoint.w;
+    highp float collision_perspective_ratio = clamp(
+        0.5 + 0.5 * (u_camera_to_center_distance / camera_to_anchor_distance),
+        0.0, // Prevents oversized near-field boxes in pitched/overzoomed tiles
+        4.0);
+
+    gl_Position = u_matrix * vec4(a_pos, 0.0, 1.0);
+    gl_Position.xy += a_extrude * u_extrude_scale * gl_Position.w * collision_perspective_ratio;
+
+    v_placed = a_placed.x;
+    v_notUsed = a_placed.y;
+}
+
+*/
+
+// Uncompressed source of collision_box.fragment.glsl:
+/*
+
+varying float v_placed;
+varying float v_notUsed;
+
+void main() {
+
+    float alpha = 0.5;
+
+    // Red = collision, hide label
+    gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0) * alpha;
+
+    // Blue = no collision, label is showing
+    if (v_placed > 0.5) {
+        gl_FragColor = vec4(0.0, 0.0, 1.0, 0.5) * alpha;
+    }
+
+    if (v_notUsed > 0.5) {
+        // This box not used, fade it out
+        gl_FragColor *= .1;
+    }
+}
+*/
+
 } // namespace shaders
 } // namespace mbgl