render: support shm screencopy from direct scanout

src/gfx_apis/vulkan.rs

@@ -18,7 +18,9 @@ use {
     crate::{
         async_engine::AsyncEngine,
         format::Format,
-        gfx_api::{GfxContext, GfxError, GfxFormat, GfxImage, GfxTexture, ResetStatus},
+        gfx_api::{
+            GfxContext, GfxError, GfxFormat, GfxFramebuffer, GfxImage, GfxTexture, ResetStatus,
+        },
         gfx_apis::vulkan::{
             image::VulkanImageMemory, instance::VulkanInstance, renderer::VulkanRenderer,
         },
@@ -255,6 +257,19 @@ impl GfxContext for Context {
     fn gfx_api(&self) -> GfxApi {
         GfxApi::Vulkan
     }
+
+    fn create_fb(
+        self: Rc<Self>,
+        width: i32,
+        height: i32,
+        stride: i32,
+        format: &'static Format,
+    ) -> Result<Rc<dyn GfxFramebuffer>, GfxError> {
+        let fb = self
+            .0
+            .create_shm_texture(format, width, height, stride, &[], true)?;
+        Ok(fb)
+    }
 }
 
 impl Drop for Context {