sharedvertfixsquare

Author: archibate

src/main.cpp

@@ -15,20 +15,19 @@ struct Vertex {
 };
 
 struct Face {
-    Vertex a, b, c;
+    unsigned int a, b, c;
+};
+
+static std::vector<Vertex> vertices = {
+    {-0.5f, 0.5f, 0.0f},
+    {-0.5f, -0.5f, 0.0f},
+    {0.5f, -0.5f, 0.0f},
+    {0.5f, 0.5f, 0.0f},
 };
 
 static std::vector<Face> faces = {
-    {
-        {-0.5f, 0.5f, 0.0f},
-        {-0.5f, -0.5f, 0.0f},
-        {0.5f, -0.5f, 0.0f},
-    },
-    {
-        {-0.5f, 0.5f, 0.0f},
-        {0.5f, -0.5f, 0.0f},
-        {0.5f, 0.5f, 0.0f},
-    },
+    {0, 1, 2},
+    {0, 2, 3},
 };
 
 /* static void load_obj(std::string path) { */
@@ -56,9 +55,12 @@ static void render() {
     glBegin(GL_TRIANGLES);
 
     for (auto const &face : faces) {
-        glVertex3f(face.a.x, face.a.y, face.a.z);
-        glVertex3f(face.b.x, face.b.y, face.b.z);
-        glVertex3f(face.c.x, face.c.y, face.c.z);
+        Vertex a = vertices[face.a];
+        Vertex b = vertices[face.b];
+        Vertex c = vertices[face.c];
+        glVertex3f(a.x, a.y, a.z);
+        glVertex3f(b.x, b.y, b.z);
+        glVertex3f(c.x, c.y, c.z);
     }
 
     CHECK_GL(glEnd());
@@ -81,7 +83,7 @@ static void mouse_button_callback
         float x = (float)(2 * xpos / width - 1);
         float y = (float)(2 * (height - ypos) / height - 1);
 
-        faces[0].a = Vertex{x, y, 0};
+        vertices[0] = Vertex{x, y, 0};
     }
 }