Merge pull request #591 from tomaka/fix-triangle

Fix the triangle in the examples

2 files changed, 13 insertions, 8 deletions

diff --git a/build.rs b/build.rs
index b8d3fb6..eaa42b3 100644
--- a/build.rs
+++ b/build.rs
@@ -176,5 +176,5 @@ fn main() {
                                     gl_generator::registry::Ns::Gles2,
                                     gl_generator::Fallbacks::All,
                                     khronos_api::GL_XML, vec![],
-                                    "2.0", "core", &mut file).unwrap();
+                                    "3.0", "core", &mut file).unwrap();
 }
diff --git a/examples/support/mod.rs b/examples/support/mod.rs
index 7e9aa4f..ab8e2a1 100644
--- a/examples/support/mod.rs
+++ b/examples/support/mod.rs
@@ -46,9 +46,12 @@ pub fn load(window: &glutin::Window) -> Context {
                            (VERTEX_DATA.len() * mem::size_of::<f32>()) as gl::types::GLsizeiptr,
                            VERTEX_DATA.as_ptr() as *const _, gl::STATIC_DRAW);
 
-        /*let mut vao = mem::uninitialized();
-        gl.GenVertexArrays(1, &mut vao);
-        gl.BindVertexArray(vao);*/
+        if gl.BindVertexArray.is_loaded() {
+            let mut vao = mem::uninitialized();
+            gl.GenVertexArrays(1, &mut vao);
+            gl.BindVertexArray(vao);
+        }
+
         let pos_attrib = gl.GetAttribLocation(program, b"position\0".as_ptr() as *const _);
         let color_attrib = gl.GetAttribLocation(program, b"color\0".as_ptr() as *const _);
         gl.VertexAttribPointer(pos_attrib as gl::types::GLuint, 2, gl::FLOAT, 0,
@@ -85,11 +88,12 @@ static VERTEX_DATA: [f32; 15] = [
 
 const VS_SRC: &'static [u8] = b"
 #version 100
+precision mediump float;
 
-lowp attribute vec2 position;
-lowp attribute vec3 color;
+attribute vec2 position;
+attribute vec3 color;
 
-lowp varying vec3 v_color;
+varying vec3 v_color;
 
 void main() {
     gl_Position = vec4(position, 0.0, 1.0);
@@ -99,8 +103,9 @@ void main() {
 
 const FS_SRC: &'static [u8] = b"
 #version 100
+precision mediump float;
 
-lowp varying vec3 v_color;
+varying vec3 v_color;
 
 void main() {
     gl_FragColor = vec4(v_color, 1.0);