From cf252c29b4c3a0f4705bc92598c858b895b94f22 Mon Sep 17 00:00:00 2001
From: Pierre Krieger <pierre.krieger1708@gmail.com>
Date: Sun, 1 Mar 2015 10:33:25 +0100
Subject: Use the WGL API to determine extended pixel format, plus fix creation

---
 src/lib.rs        |  1 +
 src/win32/init.rs | 68 +++++++++++++++++++++++++++----------------------------
 2 files changed, 34 insertions(+), 35 deletions(-)

(limited to 'src')

diff --git a/src/lib.rs b/src/lib.rs
index 4ab577a..138f87b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -195,6 +195,7 @@ pub enum MouseCursor {
 
 /// Describes a possible format. Unused.
 #[allow(missing_docs)]
+#[derive(Debug)]
 pub struct PixelFormat {
     pub red_bits: u8,
     pub green_bits: u8,
diff --git a/src/win32/init.rs b/src/win32/init.rs
index d468820..6fdafea 100644
--- a/src/win32/init.rs
+++ b/src/win32/init.rs
@@ -99,9 +99,8 @@ fn init(title: Vec<u16>, builder: BuilderAttribs<'static>, builder_sharelists: O
     // adjusting the window coordinates using the style
     unsafe { user32::AdjustWindowRectEx(&mut rect, style, 0, ex_style) };
 
-    // getting the address of wglCreateContextAttribsARB and the pixel format
-    //  that we will use
-    let (extra_functions, pixel_format) = {
+    // getting the address of wglCreateContextAttribsARB
+    let extra_functions = {
         // creating a dummy invisible window for GL initialization
         let dummy_window = unsafe {
             let handle = user32::CreateWindowExW(ex_style, class_name.as_ptr(),
@@ -132,32 +131,11 @@ fn init(title: Vec<u16>, builder: BuilderAttribs<'static>, builder_sharelists: O
             hdc
         };
 
-        // getting the pixel format that we will use
-        let pixel_format = {
+        // getting the pixel format that we will use and setting it
+        {
             let formats = enumerate_native_pixel_formats(dummy_hdc);
             let (id, _) = builder.choose_pixel_format(formats.into_iter().map(|(a, b)| (b, a)));
-
-            let mut output: winapi::PIXELFORMATDESCRIPTOR = unsafe { mem::zeroed() };
-            if unsafe { gdi32::DescribePixelFormat(dummy_hdc, id,
-                mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as winapi::UINT, &mut output) } == 0
-            {
-                let err = Err(OsError(format!("DescribePixelFormat function failed: {}",
-                    os::error_string(os::errno()))));
-                unsafe { user32::DestroyWindow(dummy_window); }
-                return err;
-            }
-
-            output
-        };
-
-        // calling SetPixelFormat
-        unsafe {
-            if gdi32::SetPixelFormat(dummy_hdc, 1, &pixel_format) == 0 {
-                let err = Err(OsError(format!("SetPixelFormat function failed: {}",
-                    os::error_string(os::errno()))));
-                user32::DestroyWindow(dummy_window);
-                return err;
-            }
+            try!(set_pixel_format(dummy_hdc, id));
         }
 
         // creating the dummy OpenGL context
@@ -186,7 +164,7 @@ fn init(title: Vec<u16>, builder: BuilderAttribs<'static>, builder_sharelists: O
         unsafe { user32::DestroyWindow(dummy_window); }
 
         // returning the address
-        (extra_functions, pixel_format)
+        extra_functions
     };
 
     // creating the real window this time
@@ -233,13 +211,15 @@ fn init(title: Vec<u16>, builder: BuilderAttribs<'static>, builder_sharelists: O
     };
 
     // calling SetPixelFormat
-    unsafe {
-        if gdi32::SetPixelFormat(hdc, 1, &pixel_format) == 0 {
-            let err = Err(OsError(format!("SetPixelFormat function failed: {}",
-                os::error_string(os::errno()))));
-            user32::DestroyWindow(real_window);
-            return err;
-        }
+    {
+        let formats = if extra_functions.GetPixelFormatAttribivARB.is_loaded() {
+            enumerate_arb_pixel_formats(&extra_functions, hdc)
+        } else {
+            enumerate_native_pixel_formats(hdc)
+        };
+
+        let (id, _) = builder.choose_pixel_format(formats.into_iter().map(|(a, b)| (b, a)));
+        try!(set_pixel_format(hdc, id));
     }
 
     // creating the OpenGL context
@@ -512,6 +492,24 @@ fn enumerate_arb_pixel_formats(extra: &gl::wgl_extra::Wgl, hdc: winapi::HDC)
     result
 }
 
+fn set_pixel_format(hdc: winapi::HDC, id: libc::c_int) -> Result<(), CreationError> {
+    let mut output: winapi::PIXELFORMATDESCRIPTOR = unsafe { mem::zeroed() };
+
+    if unsafe { gdi32::DescribePixelFormat(hdc, id,
+        mem::size_of::<winapi::PIXELFORMATDESCRIPTOR>() as winapi::UINT, &mut output) } == 0
+    {
+        return Err(OsError(format!("DescribePixelFormat function failed: {}",
+                                   os::error_string(os::errno()))));
+    }
+
+    if unsafe { gdi32::SetPixelFormat(hdc, id, &output) } == 0 {
+        return Err(OsError(format!("SetPixelFormat function failed: {}",
+                                   os::error_string(os::errno()))));
+    }
+
+    Ok(())
+}
+
 fn load_opengl32_dll() -> Result<winapi::HMODULE, CreationError> {
     let name = "opengl32.dll".utf16_units().chain(Some(0).into_iter())
                              .collect::<Vec<u16>>().as_ptr();
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