From 9261408cc8d2ba54ddea0c9ddd43560e03d45bdc Mon Sep 17 00:00:00 2001
From: Pierre Krieger <pierre.krieger1708@gmail.com>
Date: Wed, 5 Aug 2015 22:31:34 +0200
Subject: Use modern GL code for the examples

---
 examples/support/mod.rs | 104 +++++++++++++++++++++++++++++-------------------
 1 file changed, 64 insertions(+), 40 deletions(-)

(limited to 'examples/support/mod.rs')

diff --git a/examples/support/mod.rs b/examples/support/mod.rs
index 01eeb7b..7e9aa4f 100644
--- a/examples/support/mod.rs
+++ b/examples/support/mod.rs
@@ -1,19 +1,15 @@
 #![cfg(feature = "window")]
 
 use std::ffi::CStr;
+use std::mem;
+use std::ptr;
 use glutin;
 
-#[cfg(not(target_os = "android"))]
 mod gl {
+    pub use self::Gles2 as Gl;
     include!(concat!(env!("OUT_DIR"), "/test_gl_bindings.rs"));
 }
 
-#[cfg(target_os = "android")]
-mod gl {
-    pub use self::Gles1 as Gl;
-    include!(concat!(env!("OUT_DIR"), "/test_gles1_bindings.rs"));
-}
-
 pub struct Context {
     gl: gl::Gl
 }
@@ -28,30 +24,47 @@ pub fn load(window: &glutin::Window) -> Context {
 
     println!("OpenGL version {}", version);
 
+    unsafe {
+        let vs = gl.CreateShader(gl::VERTEX_SHADER);
+        gl.ShaderSource(vs, 1, [VS_SRC.as_ptr() as *const i8].as_ptr(), ptr::null());
+        gl.CompileShader(vs);
+
+        let fs = gl.CreateShader(gl::FRAGMENT_SHADER);
+        gl.ShaderSource(fs, 1, [FS_SRC.as_ptr() as *const i8].as_ptr(), ptr::null());
+        gl.CompileShader(fs);
+
+        let program = gl.CreateProgram();
+        gl.AttachShader(program, vs);
+        gl.AttachShader(program, fs);
+        gl.LinkProgram(program);
+        gl.UseProgram(program);
+
+        let mut vb = mem::uninitialized();
+        gl.GenBuffers(1, &mut vb);
+        gl.BindBuffer(gl::ARRAY_BUFFER, vb);
+        gl.BufferData(gl::ARRAY_BUFFER,
+                           (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);*/
+        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,
+                                    5 * mem::size_of::<f32>() as gl::types::GLsizei,
+                                    ptr::null());
+        gl.VertexAttribPointer(color_attrib as gl::types::GLuint, 3, gl::FLOAT, 0,
+                                    5 * mem::size_of::<f32>() as gl::types::GLsizei,
+                                    (2 * mem::size_of::<f32>()) as *const () as *const _);
+        gl.EnableVertexAttribArray(pos_attrib as gl::types::GLuint);
+        gl.EnableVertexAttribArray(color_attrib as gl::types::GLuint);
+    }
+
     Context { gl: gl }
 }
 
 impl Context {
-    #[cfg(not(target_os = "android"))]
-    pub fn draw_frame(&self, color: (f32, f32, f32, f32)) {
-        unsafe {
-            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();
-
-            self.gl.Flush();
-        }
-    }
-
-    #[cfg(target_os = "android")]
     pub fn draw_frame(&self, color: (f32, f32, f32, f32)) {
         use std::mem;
 
@@ -59,26 +72,37 @@ impl Context {
             self.gl.ClearColor(color.0, color.1, color.2, color.3);
             self.gl.Clear(gl::COLOR_BUFFER_BIT);
 
-            self.gl.EnableClientState(gl::VERTEX_ARRAY);
-            self.gl.EnableClientState(gl::COLOR_ARRAY);
-
-            self.gl.VertexPointer(2, gl::FLOAT, (mem::size_of::<f32>() * 5) as i32,
-                                  mem::transmute(VERTEX_DATA.as_ptr()));
-            self.gl.ColorPointer(3, gl::FLOAT, (mem::size_of::<f32>() * 5) as i32,
-                                  mem::transmute(VERTEX_DATA.as_ptr().offset(2)));
-
             self.gl.DrawArrays(gl::TRIANGLES, 0, 3);
-            self.gl.DisableClientState(gl::VERTEX_ARRAY);
-            self.gl.DisableClientState(gl::COLOR_ARRAY);
-            
-            self.gl.Flush();
         }
     }
 }
 
-#[cfg(target_os = "android")]
 static 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
 ];
+
+const VS_SRC: &'static [u8] = b"
+#version 100
+
+lowp attribute vec2 position;
+lowp attribute vec3 color;
+
+lowp varying vec3 v_color;
+
+void main() {
+    gl_Position = vec4(position, 0.0, 1.0);
+    v_color = color;
+}
+\0";
+
+const FS_SRC: &'static [u8] = b"
+#version 100
+
+lowp varying vec3 v_color;
+
+void main() {
+    gl_FragColor = vec4(v_color, 1.0);
+}
+\0";
-- 
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