Add triangle to example

1 files changed, 45 insertions, 1 deletions

diff --git a/examples/support/mod.rs b/examples/support/mod.rs
index 4495f17..1dddfc3 100644
--- a/examples/support/mod.rs
+++ b/examples/support/mod.rs
@@ -3,8 +3,15 @@ extern crate gl_generator;
 
 use gl_init;
 
+#[cfg(not(target_os = "android"))]
 mod gl {
-    generate_gl_bindings!("gl", "core", "4.5", "struct")
+    generate_gl_bindings!("gl", "core", "1.1", "struct")
+}
+
+#[cfg(target_os = "android")]
+mod gl {
+    pub use self::Gles1 as Gl;
+    generate_gl_bindings!("gles1", "core", "1.1", "struct")
 }
 
 pub struct Context {
@@ -25,8 +32,45 @@ pub fn load(window: &gl_init::Window) -> Context {
 }
 
 impl Context {
+    #[cfg(not(target_os = "android"))]
     pub fn draw_frame(&self, color: (f32, f32, f32, f32)) {
         self.gl.ClearColor(color.0, color.1, color.2, color.3);
         self.gl.Clear(gl::COLOR_BUFFER_BIT);
+
+        self.gl.Begin(gl::TRIANGLES);
+        self.gl.Color3f(1.0, 0.0, 0.0);
+        self.gl.Vertex2f(-0.5, -0.5);
+        self.gl.Color3f(0.0, 1.0, 0.0);
+        self.gl.Vertex2f(0.0, 0.5);
+        self.gl.Color3f(0.0, 0.0, 1.0);
+        self.gl.Vertex2f(0.5, -0.5);
+        self.gl.End();
+    }
+
+    #[cfg(target_os = "android")]
+    pub fn draw_frame(&self, color: (f32, f32, f32, f32)) {
+        self.gl.ClearColor(color.0, color.1, color.2, color.3);
+        self.gl.Clear(gl::COLOR_BUFFER_BIT);
+
+        let vertex_data: [f32, ..15] = [
+            -0.5, -0.5, 1.0, 0.0, 0.0,
+            0.0, 0.5, 0.0, 1.0, 0.0,
+            0.5, -0.5, 0.0, 0.0, 1.0
+        ];
+
+        self.gl.EnableClientState(gl::VERTEX_ARRAY);
+        self.gl.EnableClientState(gl::COLOR_ARRAY);
+
+        unsafe {
+            use std::mem;
+            self.gl.VertexPointer(2, gl::FLOAT, (mem::size_of::<f32>() * 5) as i32,
+                mem::transmute(vertex_data.as_slice().as_ptr()));
+            self.gl.ColorPointer(3, gl::FLOAT, (mem::size_of::<f32>() * 5) as i32,
+                mem::transmute(vertex_data.as_slice().as_ptr().offset(2)));
+        }
+
+        self.gl.DrawArrays(gl::TRIANGLES, 0, 3);
+        self.gl.DisableClientState(gl::VERTEX_ARRAY);
+        self.gl.DisableClientState(gl::COLOR_ARRAY);
     }
 }