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glium 0.36.0

Elegant and safe OpenGL wrapper. Glium is an intermediate layer between OpenGL and your application. You still need to manually handle the graphics pipeline, but without having to use OpenGL's old and error-prone API. Its objectives: - Be safe to use. Many aspects of OpenGL that can trigger a crash if misused are automatically handled by glium. - Provide an API that enforces good pratices such as RAII or stateless function calls. - Be compatible with all OpenGL versions that support shaders, providing unified API when things diverge. - Avoid all OpenGL errors beforehand. - Produce optimized OpenGL function calls, and allow the user to easily use modern OpenGL techniques.
Documentation 
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use super::Context;

/// Describes an error preventing the retrieval of the uuid.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub enum UuidError {
    /// EXT_external_objects is not supported by the driver
    ExtensionNotPresent,
}

impl std::fmt::Display for UuidError {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let desc = match self {
            UuidError::ExtensionNotPresent => "EXT_external_objects is not supported by the driver",
        };

        f.write_str(desc)
    }
}

impl std::error::Error for UuidError {}

impl Context {
    /// Returns the UUID of the driver currently being used by this context.
    ///
    /// Useful to ensure compatibility when sharing resources with an external API.
    pub fn driver_uuid(&self) -> Result<[u8; 16], UuidError> {
        if !self.extensions.gl_ext_semaphore && !self.extensions.gl_ext_memory_object {
            return Err(UuidError::ExtensionNotPresent);
        }
        let mut data = [0u8; 16];
        unsafe {
            self.gl.GetUnsignedBytevEXT(crate::gl::DRIVER_UUID_EXT, data.as_mut_ptr())
        };
        Ok(data)
    }

    /// Returns the UUIDs of the devices being used by this context.
    ///
    /// Useful to ensure compatibility when sharing resources with an external API.
    pub fn device_uuids(&self) -> Result<Vec<[u8; 16]>, UuidError> {
        if !self.extensions.gl_ext_semaphore && !self.extensions.gl_ext_memory_object {
            return Err(UuidError::ExtensionNotPresent);
        }
        let mut n = std::mem::MaybeUninit::<i32>::uninit();
        let n = unsafe {
            self.gl.GetIntegerv(crate::gl::NUM_DEVICE_UUIDS_EXT, n.as_mut_ptr());
            n.assume_init()
        };

        let mut res = Vec::with_capacity(n as usize);
        for i in 0..n {
            let mut data = [0u8; 16];
            unsafe {
                self.gl.GetUnsignedBytei_vEXT(
                    crate::gl::DEVICE_UUID_EXT,
                    i as u32,
                    data.as_mut_ptr(),
                )
            };
            res.push(data);
        }

        Ok(res)
    }
}