hello world

src/main.rs

@@ -27,9 +27,8 @@ use glutin::event_loop::ControlFlow;
 // initial window size
 const INITIAL_SCREEN_W: u32 = 800;
 const INITIAL_SCREEN_H: u32 = 600;
-// TODO: I used the funny number.
-const VERTEX_ATTRIBUTE_INDEX: u32 = 3;
-const DIMENSIONS: i32 = 2;
+const VERTEX_ATTRIBUTE_INDEX: u32 = 0;
+const DIMENSIONS: i32 = 3;
 
 // == // Helper functions to make interacting with OpenGL a little bit prettier. You *WILL* need these! // == //
 
@@ -99,7 +98,6 @@ unsafe fn create_vao(vertices: &Vec<f32>, indices: &Vec<u32>) -> u32 {
     );
     gl::EnableVertexAttribArray(VERTEX_ATTRIBUTE_INDEX);
 
-
     let mut index_buf_id = 0;
     gl::GenBuffers(1, &mut index_buf_id);
     gl::BindBuffer(gl::ELEMENT_ARRAY_BUFFER, index_buf_id);
@@ -110,8 +108,6 @@ unsafe fn create_vao(vertices: &Vec<f32>, indices: &Vec<u32>) -> u32 {
         gl::STATIC_DRAW,
     );
 
-    gl::DrawElements(gl::TRIANGLES, indices.len() as i32, gl::UNSIGNED_INT, std::ptr::null());
-
     vao_id
 }
 
@@ -185,11 +181,16 @@ fn main() {
 
         // == // Set up your VAO around here
 
-        let vertices = vec![-1., 0., 1., 0.5];
-        let indices = vec![0, 1, 2, 1, 1, 3];
+        let vertices = vec![
+        -0.6, -0.6, 0.,
+        0.6, -0.6, 0., 
+        0., 0.6, 0.
+        ];
+        let indices = vec![0, 1, 2];
         let my_vao = unsafe {
-            create_vao(&vertices, &indices);
+            create_vao(&vertices, &indices)
         };
+
         println!("created vao!");
         // let my_vao = unsafe { 1337 };
 
@@ -206,10 +207,6 @@ fn main() {
         let simple_shader = unsafe {
             shader::ShaderBuilder::new()
                 .attach_file("./shaders/simple.vert")
-                .link()
-        };
-        let simple_shader = unsafe {
-            shader::ShaderBuilder::new()
                 .attach_file("./shaders/simple.frag")
                 .link()
         };
@@ -274,6 +271,14 @@ fn main() {
                 gl::Clear(gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT);
 
                 // == // Issue the necessary gl:: commands to draw your scene here
+                simple_shader.activate();
+                gl::BindVertexArray(my_vao);
+                gl::DrawElements(
+                    gl::TRIANGLES,
+                    indices.len() as i32,
+                    gl::UNSIGNED_INT,
+                    std::ptr::null(),
+                );
             }
 
             // Display the new color buffer on the display