Optimize sphere mesh

examples/testbed/framework/sphere_mesh.h

@@ -19,95 +19,32 @@
 #ifndef SPHERE_MESH_H
 #define SPHERE_MESH_H
 
-#include <bounce/bounce.h>
+#include <bounce/common/math/vec3.h>
 
-//
+// This structure represents a triangle mesh.
 struct smMesh
 {
-	smMesh() { }
-
-	smMesh& operator=(const smMesh& other)
+	smMesh()
 	{
-		Copy(other);
-		return *this;
+		vertexCount = 0;
+		vertices = nullptr;
+		indexCount = 0;
+		indices = nullptr;
 	}
 
-	void Copy(const smMesh& other)
+	~smMesh()
 	{
-		vertices = other.vertices;
-		triangleIndices = other.triangleIndices;
+		free(vertices);
+		free(indices);
 	}
 
-	void AddVertex(float32 x, float32 y, float32 z)
-	{
-		vertices.PushBack(b3Vec3(x, y, z));
-	}
-
-	void AddTriangle(u32 v1, u32 v2, u32 v3)
-	{
-		triangleIndices.PushBack(v1);
-		triangleIndices.PushBack(v2);
-		triangleIndices.PushBack(v3);
-	}
-
-	void SetAsIcosahedron()
-	{
-		assert(vertices.Count() == 0);
-
-		float32 t = 0.5f * (1.0f + b3Sqrt(5.0f));
-
-		AddVertex(-1.0f, t, 0.0f);
-		AddVertex(1.0f, t, 0.0f);
-		AddVertex(-1.0f, -t, 0.0f);
-		AddVertex(1.0f, -t, 0.0f);
-
-		AddVertex(0.0f, -1.0f, t);
-		AddVertex(0.0f, 1.0f, t);
-		AddVertex(0.0f, -1.0f, -t);
-		AddVertex(0.0f, 1.0f, -t);
-
-		AddVertex(t, 0.0f, -1.0f);
-		AddVertex(t, 0.0f, 1.0f);
-		AddVertex(-t, 0.0f, -1.0f);
-		AddVertex(-t, 0.0f, 1.0f);
-
-		for (u32 i = 0; i < vertices.Count(); ++i)
-		{
-			vertices[i].Normalize();
-		}
-
-		assert(triangleIndices.Count() == 0);
-
-		AddTriangle(0, 11, 5);
-		AddTriangle(0, 5, 1);
-		AddTriangle(0, 1, 7);
-		AddTriangle(0, 7, 10);
-		AddTriangle(0, 10, 11);
-
-		AddTriangle(1, 5, 9);
-		AddTriangle(5, 11, 4);
-		AddTriangle(11, 10, 2);
-		AddTriangle(10, 7, 6);
-		AddTriangle(7, 1, 8);
-
-		AddTriangle(3, 9, 4);
-		AddTriangle(3, 4, 2);
-		AddTriangle(3, 2, 6);
-		AddTriangle(3, 6, 8);
-		AddTriangle(3, 8, 9);
-
-		AddTriangle(4, 9, 5);
-		AddTriangle(2, 4, 11);
-		AddTriangle(6, 2, 10);
-		AddTriangle(8, 6, 7);
-		AddTriangle(9, 8, 1);
-	}
-
-	b3StackArray<b3Vec3, 256> vertices;
-	b3StackArray<u32, 256> triangleIndices;
+	u32 vertexCount; // number of unique vertices
+	b3Vec3* vertices; // list of unique vertices
+	u32 indexCount; // number of triangle vertex indices
+	u32* indices; // list of triangle vertex index
 };
 
-// Generate an icosphere given the number of subdivisions.
+// Create a unit icosphere given the number of subdivisions.
 void smCreateMesh(smMesh& output, u32 subdivisions);
 
 #endif