1 files changed, 41 insertions, 9 deletions

diff --git a/tests/headless.rs b/tests/headless.rs
index fdbb6c2..69d06b8 100644
--- a/tests/headless.rs
+++ b/tests/headless.rs
@@ -1,28 +1,60 @@
 extern crate glutin;
 extern crate libc;
+use glutin::*;
+use std::ptr;
 
 mod gl {
     include!(concat!(env!("OUT_DIR"), "/test_gl_bindings.rs"));
 }
+use gl::types::*;
 
-#[cfg(feature = "headless")]
 #[test]
 fn main() {
-    let window = glutin::HeadlessRendererBuilder::new(1024, 768).build().unwrap();
+    let width: i32 = 2;
+    let height: i32 = 1;
+    let window = glutin::HeadlessRendererBuilder::new(width as u32, height as u32).build().unwrap();
 
     unsafe { window.make_current() };
 
-    let gl = gl::Gl::load_with(|symbol| window.get_proc_address(symbol));
+    let gl = gl::Gl::load_with(|symbol| window.get_proc_address(symbol) as *const _);
 
     unsafe {
+        let mut framebuffer = 0;
+        let mut texture = 0;
+        gl.GenFramebuffers(1, &mut framebuffer);
+        gl.BindFramebuffer(gl::FRAMEBUFFER, framebuffer);
+        gl.GenTextures(1, &mut texture);
+        gl.BindTexture(gl::TEXTURE_2D, texture);
+        gl.TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MAG_FILTER, gl::LINEAR as i32);
+        gl.TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MIN_FILTER, gl::LINEAR as i32);
+        gl.TexImage2D(gl::TEXTURE_2D, 0, gl::RGBA as i32, width, height,
+                     0, gl::RGBA, gl::UNSIGNED_BYTE, ptr::null());
+        gl.FramebufferTexture(gl::FRAMEBUFFER, gl::COLOR_ATTACHMENT0, texture, 0);
+        let status = gl.CheckFramebufferStatus(gl::FRAMEBUFFER);
+        if status != gl::FRAMEBUFFER_COMPLETE {
+          panic!("Error while creating the framebuffer");
+        }
+
         gl.ClearColor(0.0, 1.0, 0.0, 1.0);
         gl.Clear(gl::COLOR_BUFFER_BIT);
+        gl.Enable(gl::SCISSOR_TEST);
+        gl.Scissor(1, 0, 1, 1);
+        gl.ClearColor(1.0, 0.0, 0.0, 1.0);
+        gl.Clear(gl::COLOR_BUFFER_BIT);
+
+        let mut values: Vec<u8> = vec![0;(width*height*4) as usize];
+        gl.ReadPixels(0, 0, width, height, gl::RGBA, gl::UNSIGNED_BYTE, values.as_mut_ptr() as *mut GLvoid);
+
+        println!("{:?}", values);
+
+        assert_eq!(values[0], 0);
+        assert_eq!(values[1], 255);
+        assert_eq!(values[2], 0);
+        assert_eq!(values[3], 255);
 
-        let mut value: (u8, u8, u8, u8) = std::mem::uninitialized();
-        gl.ReadPixels(0, 0, 1, 1, gl::RGBA, gl::UNSIGNED_BYTE, std::mem::transmute(&mut value));
-        
-        assert!(value == (0, 255, 0, 255) || value == (0, 64, 0, 255) ||
-                value == (0, 64, 0, 255) || value == (0, 64, 0, 0),
-                "value is: {:?}", value);
+        assert_eq!(values[4], 255);
+        assert_eq!(values[5], 0);
+        assert_eq!(values[6], 0);
+        assert_eq!(values[7], 255);
     }
 }