From f4a1d120897584d7645741dd3b79354a92397efd Mon Sep 17 00:00:00 2001
From: Erik Broberg <Erik Broberg>
Date: Tue, 21 Jun 2016 12:25:38 -0400
Subject: [PATCH] Enable easy access to screen space points for AABB3s through
 DebugRenderer

---
 modules/debugging/rendering/debugrenderer.cpp | 27 +++++++++++++++++++
 modules/debugging/rendering/debugrenderer.h   |  7 +++++
 2 files changed, 34 insertions(+)

diff --git a/modules/debugging/rendering/debugrenderer.cpp b/modules/debugging/rendering/debugrenderer.cpp
index 6cb8a58037..929cd30400 100644
--- a/modules/debugging/rendering/debugrenderer.cpp
+++ b/modules/debugging/rendering/debugrenderer.cpp
@@ -208,4 +208,31 @@ namespace openspace {
         glEnable(GL_CULL_FACE);
     }
     
+    void DebugRenderer::renderAABB2(const AABB2& screenSpaceAABB, glm::vec4 rgba) const {
+        std::vector<vec4> vertices(4);
+        vertices[0] = vec4(screenSpaceAABB.min.x, screenSpaceAABB.min.y, 1, 1);
+        vertices[1] = vec4(screenSpaceAABB.min.x, screenSpaceAABB.max.y, 1, 1);
+        vertices[2] = vec4(screenSpaceAABB.max.x, screenSpaceAABB.min.y, 1, 1);
+        vertices[3] = vec4(screenSpaceAABB.max.x, screenSpaceAABB.max.y, 1, 1);
+
+        renderVertices(vertices, GL_LINES, rgba);
+    }
+
+    const std::vector<glm::vec4> DebugRenderer::screenSpacePointsFor(const AABB3& screenSpaceAABB) const {
+        std::vector<vec4> vertices(8);
+        for (size_t i = 0; i < 8; i++) {
+            bool cornerIsRight = i % 2 == 0;
+            bool cornerIsUp = i > 3;
+            bool cornerIsFar = (i / 2) % 2 == 1;
+
+            double x = cornerIsRight ? screenSpaceAABB.max.x : screenSpaceAABB.min.x;
+            double y = cornerIsUp ? screenSpaceAABB.max.y : screenSpaceAABB.min.y;
+            double z = cornerIsFar ? screenSpaceAABB.max.z : screenSpaceAABB.min.z;
+
+            vertices[i] = vec4(x, y, z, 1);
+        }
+        return std::move(vertices);
+    }
+
+
 } // namespace openspace
\ No newline at end of file
diff --git a/modules/debugging/rendering/debugrenderer.h b/modules/debugging/rendering/debugrenderer.h
index 86936f499c..770598d9f6 100644
--- a/modules/debugging/rendering/debugrenderer.h
+++ b/modules/debugging/rendering/debugrenderer.h
@@ -29,6 +29,7 @@
 #include <ghoul/opengl/programobject.h>
 
 #include <openspace/util/updatestructures.h>
+#include <modules/globebrowsing/geometry/aabb.h>
 
 
 #include <glm/glm.hpp>
@@ -52,11 +53,17 @@ namespace openspace {
         static std::shared_ptr<DebugRenderer> ref();
 
 
+        
         void renderVertices(const std::vector<glm::vec4>& clippingSpacePoints, GLenum mode, glm::vec4 rgba = {1, 0, 0, 1}) const;
         void renderBoxFaces(const std::vector<glm::vec4>& clippingSpacePoints, glm::vec4 rgba = { 1, 0, 0, 1 }) const;
         void renderBoxEdges(const std::vector<glm::vec4>& clippingSpacePoints, glm::vec4 rgba = { 1, 0, 0, 1 }) const;
         void renderNiceBox(const std::vector<glm::vec4>& clippingSpacePoints, glm::vec4 rgba = { 1, 0, 0, 0.3 }) const;
+
         void renderCameraFrustum(const RenderData& data, const Camera& otherCamera) const;
+        void renderAABB2(const AABB2& screenSpaceAABB, glm::vec4 rgba = { 1, 1, 1, 0.3 }) const;
+
+        const std::vector<glm::vec4> screenSpacePointsFor(const AABB3& screenSpaceAABB) const;
+        
         
 
     private: