renderer: add destroy_texture function

src/backend/drm/render.rs

@@ -251,6 +251,10 @@ where
     fn import_egl(&mut self, buffer: &EGLBuffer) -> Result<Self::Texture, Self::Error> {
         self.renderer.import_egl(buffer).map_err(Error::RenderError)       
     }
+
+    fn destroy_texture(&mut self, texture: Self::Texture) -> Result<(), Self::Error> {
+        self.renderer.destroy_texture(texture).map_err(Error::RenderError)
+    }
     
     fn begin(&mut self, width: u32, height: u32, transform: Transform) -> Result<(), Error<E1, E2, E3>> {
         if self.current_buffer.is_some() {

src/backend/renderer/gles2/mod.rs

@@ -558,6 +558,17 @@ impl Renderer for Gles2Renderer {
         
         Ok(texture)
     }
+    
+    fn destroy_texture(&mut self, mut texture: Self::Texture) -> Result<(), Self::Error> {
+        self.make_current()?;
+
+        unsafe {
+            self.gl.DeleteTextures(1, &mut texture.texture);
+        }
+        self.egl.unbind()?;
+
+        Ok(())
+    }
 
 
     fn begin(&mut self, width: u32, height: u32, transform: Transform) -> Result<(), Gles2Error> {

src/backend/renderer/mod.rs

@@ -147,6 +147,7 @@ pub trait Renderer {
     fn import_shm(&mut self, buffer: &wl_buffer::WlBuffer) -> Result<Self::Texture, Self::Error>;
     #[cfg(feature = "wayland_frontend")]
     fn import_egl(&mut self, buffer: &EGLBuffer) -> Result<Self::Texture, Self::Error>;
+    fn destroy_texture(&mut self, texture: Self::Texture) -> Result<(), Self::Error>;
 
     fn begin(&mut self, width: u32, height: u32, transform: Transform) -> Result<(), <Self as Renderer>::Error>;
     fn finish(&mut self) -> Result<(), SwapBuffersError>;

src/backend/winit.rs

@@ -280,6 +280,10 @@ impl Renderer for WinitGraphicsBackend {
         self.renderer.import_egl(buffer)        
     }
 
+    fn destroy_texture(&mut self, texture: Self::Texture) -> Result<(), Self::Error> {
+        self.renderer.destroy_texture(texture)
+    }
+
     fn begin(&mut self, width: u32, height: u32, transform: Transform) -> Result<(), <Self as Renderer>::Error> {
         self.renderer.bind(self.egl.clone())?;
         self.renderer.begin(width, height, transform)