graphics: Move PixelFormat out of gl module

src/backend/drm/egl/surface.rs

@@ -7,7 +7,10 @@ use super::error::*;
 use backend::drm::{Device, Surface};
 use backend::egl::native::{Backend, NativeDisplay, NativeSurface};
 use backend::egl::{EGLContext, EGLSurface};
-use backend::graphics::gl::{GLGraphicsBackend, PixelFormat};
+#[cfg(feature = "renderer_gl")]
+use backend::graphics::gl::GLGraphicsBackend;
+#[cfg(feature = "renderer_gl")]
+use backend::graphics::PixelFormat;
 use backend::graphics::{CursorBackend, SwapBuffersError};
 
 pub struct EglSurface<
@@ -91,6 +94,7 @@ where
     }
 }
 
+#[cfg(feature = "renderer_gl")]
 impl<B: Backend<Surface = <D as Device>::Surface> + 'static, D: Device + NativeDisplay<B> + 'static>
     GLGraphicsBackend for EglSurface<B, D>
 where

src/backend/egl/context.rs

@@ -1,7 +1,7 @@
 //! EGL context related structs
 
 use super::{error::*, ffi, native, EGLSurface};
-use backend::graphics::gl::PixelFormat;
+use backend::graphics::PixelFormat;
 use nix::libc::{c_int, c_void};
 use slog;
 use std::{

src/backend/egl/mod.rs

@@ -337,6 +337,7 @@ impl EGLDisplay {
         context: &EGLContext<B, N>,
         display: *mut wl_display,
     ) -> EGLDisplay {
+        #[cfg(feature = "renderer_gl")]
         let gl = gl_ffi::Gles2::load_with(|s| unsafe { context.get_proc_address(s) as *const _ });
 
         EGLDisplay {

src/backend/graphics/format.rs

@@ -0,0 +1,22 @@
+/// Describes the pixel format of a framebuffer
+#[derive(Debug, Clone, Copy, PartialEq, Eq)]
+pub struct PixelFormat {
+    /// is the format hardware accelerated
+    pub hardware_accelerated: bool,
+    /// number of bits used for colors
+    pub color_bits: u8,
+    /// number of bits used for alpha channel
+    pub alpha_bits: u8,
+    /// number of bits used for depth channel
+    pub depth_bits: u8,
+    /// number of bits used for stencil buffer
+    pub stencil_bits: u8,
+    /// is stereoscopy enabled
+    pub stereoscopy: bool,
+    /// is double buffering enabled
+    pub double_buffer: bool,
+    /// number of samples used for multisampling if enabled
+    pub multisampling: Option<u16>,
+    /// is srgb enabled
+    pub srgb: bool,
+}

src/backend/graphics/gl.rs

@@ -1,6 +1,6 @@
 use nix::libc::c_void;
 
-use super::SwapBuffersError;
+use super::{SwapBuffersError, PixelFormat};
 
 #[cfg_attr(feature = "cargo-clippy", allow(clippy))]
 #[allow(missing_docs)]
@@ -10,29 +10,6 @@ pub(crate) mod ffi {
 
 pub use self::ffi::Gles2;
 
-/// Describes the pixel format of the main framebuffer
-#[derive(Debug, Clone, Copy, PartialEq, Eq)]
-pub struct PixelFormat {
-    /// is the format hardware accelerated
-    pub hardware_accelerated: bool,
-    /// number of bits used for colors
-    pub color_bits: u8,
-    /// number of bits used for alpha channel
-    pub alpha_bits: u8,
-    /// number of bits used for depth channel
-    pub depth_bits: u8,
-    /// number of bits used for stencil buffer
-    pub stencil_bits: u8,
-    /// is stereoscopy enabled
-    pub stereoscopy: bool,
-    /// is double buffering enabled
-    pub double_buffer: bool,
-    /// number of samples used for multisampling if enabled
-    pub multisampling: Option<u16>,
-    /// is srgb enabled
-    pub srgb: bool,
-}
-
 /// Trait that describes objects that have an OpenGL context
 /// and can be used to render upon
 pub trait GLGraphicsBackend {

src/backend/graphics/mod.rs

@@ -8,6 +8,9 @@ pub use self::errors::*;
 mod cursor;
 pub use self::cursor::*;
 
+mod format;
+pub use self::format::*;
+
 #[cfg(feature = "renderer_gl")]
 pub mod gl;
 #[cfg(feature = "renderer_glium")]

src/backend/winit.rs

@@ -6,8 +6,8 @@ use backend::{
         EGLDisplay, EGLGraphicsBackend, EGLSurface,
     },
     graphics::{
-        gl::{GLGraphicsBackend, PixelFormat},
-        CursorBackend, SwapBuffersError,
+        gl::GLGraphicsBackend,
+        CursorBackend, SwapBuffersError, PixelFormat,
     },
     input::{
         Axis, AxisSource, Event as BackendEvent, InputBackend, InputHandler, KeyState, KeyboardKeyEvent,