From 3e757dbc71682972899a48651710c5d8280c3cee Mon Sep 17 00:00:00 2001
From: Kiet Tran <kietatr@gmail.com>
Date: Mon, 29 Nov 2021 13:36:54 -0600
Subject: Publish A6

---
 dev/a6-harold/edge_mesh.h | 82 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 dev/a6-harold/edge_mesh.h

(limited to 'dev/a6-harold/edge_mesh.h')

diff --git a/dev/a6-harold/edge_mesh.h b/dev/a6-harold/edge_mesh.h
new file mode 100644
index 0000000..5120d0b
--- /dev/null
+++ b/dev/a6-harold/edge_mesh.h
@@ -0,0 +1,82 @@
+/** CSci-4611 Assignment 5:  Art Render
+ */
+
+#ifndef EDGE_MESH_H
+#define EDGE_MESH_H
+
+#include <mingfx.h>
+using namespace mingfx;
+
+#include <vector>
+
+
+/** This special kind of mesh stores two triangles that form a quadralateral
+ along each edge of an existing mesh.  The quad initially has a width=0, but
+ when rendered, two of the vertices are extended along the surfaces normal
+ direction, which creates a "fin" that can be drawn as a thick border.  This
+ can be used to create a silhouette edge renderer if the shader only extends
+ the edges that lie along a silhouette of the mesh.
+ */
+class EdgeMesh {
+public:
+    EdgeMesh();
+    virtual ~EdgeMesh();
+
+    /// Creates two triangles along each edge of the mesh passed in.
+    void CreateFromMesh(const Mesh &mesh);
+
+    /// Saves the mesh data to the GPU - must be called with InitOpenGL or Draw.
+    void UpdateGPUMemory();
+    
+    /// Num vertices in the edge mesh
+    int num_vertices() const;
+    
+    /// Num triangles in the edge mesh
+    int num_triangles() const;
+    
+    /// Access to vertex position by vertex number
+    Point3 vertex(int vertexID) const;
+
+    /// Access to vertex normal by vertex number
+    Vector3 normal(int vertexID) const;
+
+    /// Access to vertex color by vertex number
+    Color color(int vertexID) const;
+
+    /// Access to vertex texture coords by vertex number
+    Point2 tex_coords(int textureUnit, int vertexID) const;
+    
+
+    /// Draws the mesh assuming a shader has already been bound.
+    void Draw();
+    
+private:
+    
+    // Some routines and variables are needed internally to construct the edge
+    // mesh from a regular mesh.
+    
+    typedef std::map<std::pair<int,int>,int> EdgeMap;
+    EdgeMap edgeMap;
+
+    void addEdge(std::vector<Point3> *vertices,
+                 std::vector<Vector3> *normals,
+                 std::vector<Vector3> *leftNormals,
+                 std::vector<Vector3> *rightNormals,
+                 std::vector< std::vector<unsigned int> > *triangles,
+                 const Mesh &mesh, int v0, int v1, Vector3 n);
+
+    std::vector<float> verts_;          // vertex positions
+    std::vector<float> norms_;          // normals
+    std::vector<unsigned int> indices_; // indices
+    std::vector<float> leftNorms_;      // normals of adjacent triangles
+    std::vector<float> rightNorms_;
+
+    GLuint vertexBuffer_;
+    GLuint vertexArray_;
+    GLuint elementBuffer_;
+
+    bool gpuDirty_;
+};
+
+#endif
+
-- 
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