From 1974b2a344e3472ba5e96561877216926ffa9e13 Mon Sep 17 00:00:00 2001
From: Andreas Reich <r_andreas2@web.de>
Date: Wed, 13 Jan 2021 00:01:25 +0100
Subject: [PATCH] [rs] Exposed get_texture_format_features on adapter

---
 wgpu/src/backend/direct.rs | 13 +++++++++++++
 wgpu/src/backend/web.rs    |  8 ++++++++
 wgpu/src/lib.rs            | 16 ++++++++++++++++
 3 files changed, 37 insertions(+)

diff --git a/wgpu/src/backend/direct.rs b/wgpu/src/backend/direct.rs
index 6387b84c23..e8cad6b193 100644
--- a/wgpu/src/backend/direct.rs
+++ b/wgpu/src/backend/direct.rs
@@ -710,6 +710,19 @@ impl crate::Context for Context {
         }
     }
 
+    fn adapter_get_texture_format_features(
+        &self,
+        adapter: &Self::AdapterId,
+        format: wgt::TextureFormat,
+    ) -> wgt::TextureFormatFeatures {
+        let global = &self.0;
+        match wgc::gfx_select!(*adapter => global.adapter_get_texture_format_features(*adapter, format))
+        {
+            Ok(info) => info,
+            Err(err) => self.handle_error_fatal(err, "Adapter::get_texture_format_features"),
+        }
+    }
+
     fn device_features(&self, device: &Self::DeviceId) -> Features {
         let global = &self.0;
         match wgc::gfx_select!(device.id => global.device_features(device.id)) {
diff --git a/wgpu/src/backend/web.rs b/wgpu/src/backend/web.rs
index 753d7555b2..8d056413bb 100644
--- a/wgpu/src/backend/web.rs
+++ b/wgpu/src/backend/web.rs
@@ -984,6 +984,14 @@ impl crate::Context for Context {
         }
     }
 
+    fn adapter_get_texture_format_features(
+        &self,
+        _adapter: &Self::AdapterId,
+        format: wgt::TextureFormat,
+    ) -> wgt::TextureFormatFeatures {
+        format.describe().guaranteed_format_features
+    }
+
     fn device_features(&self, _device: &Self::DeviceId) -> wgt::Features {
         // TODO: web-sys has no way of getting extensions on devices
         wgt::Features::empty()
diff --git a/wgpu/src/lib.rs b/wgpu/src/lib.rs
index c2ee1d38fe..7691ff41f6 100644
--- a/wgpu/src/lib.rs
+++ b/wgpu/src/lib.rs
@@ -197,6 +197,11 @@ trait Context: Debug + Send + Sized + Sync {
     fn adapter_features(&self, adapter: &Self::AdapterId) -> Features;
     fn adapter_limits(&self, adapter: &Self::AdapterId) -> Limits;
     fn adapter_get_info(&self, adapter: &Self::AdapterId) -> AdapterInfo;
+    fn adapter_get_texture_format_features(
+        &self,
+        adapter: &Self::AdapterId,
+        format: wgt::TextureFormat,
+    ) -> wgt::TextureFormatFeatures;
 
     fn device_features(&self, device: &Self::DeviceId) -> Features;
     fn device_limits(&self, device: &Self::DeviceId) -> Limits;
@@ -1413,6 +1418,17 @@ impl Adapter {
     pub fn get_info(&self) -> AdapterInfo {
         Context::adapter_get_info(&*self.context, &self.id)
     }
+
+    /// Returns the features supported for a given texture format by this adapter.
+    ///
+    /// Note that the WebGPU spec further restricts the available usages/features.
+    /// To disable these restrictions on a device, request the [`Features::TEXTURE_ADAPTER_SPECIFIC_FORMAT_FEATURES`] feature.
+    pub fn get_texture_format_features(
+        &self,
+        format: wgt::TextureFormat,
+    ) -> wgt::TextureFormatFeatures {
+        Context::adapter_get_texture_format_features(&*self.context, &self.id, format)
+    }
 }
 
 impl Device {