make it possible to set gpu backend

.github/workflows/rust.yml

@@ -185,45 +185,45 @@ jobs:
           name: windows-build-artifacts
           path: target/release/fe.exe
 
-  build-mac:
-    runs-on: macos-latest
-
-    steps:
-      - uses: actions/checkout@v1
-
-      - name: Cache Cargo registry
-        uses: actions/cache@v1
-        with:
-          path: ~/.cargo/registry
-          key: ${{ runner.os }}-stable-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-stable-cargo-registry-
-
-      - name: Cache Cargo index
-        uses: actions/cache@v1
-        with:
-          path: ~/.cargo/git
-          key: ${{ runner.os }}-stable-cargo-index-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-stable-cargo-index-
-
-      - name: Cache Cargo build
-        uses: actions/cache@v1
-        with:
-          path: target/debug
-          key: ${{ runner.os }}-stable-debug-target-${{ hashFiles('**/Cargo.lock') }}
-          restore-keys: |
-            ${{ runner.os }}-stable-debug-target-
-
-      - name: Install Rust
-        run: |
-          rustup update ${{ matrix.rust }} --no-self-update 
-          rustup default ${{ matrix.rust }}
-      - name: Build
-        run: cargo build --release
-
-      - name: Upload build artifacts
-        uses: actions/upload-artifact@v1
-        with:
-          name: macos-build-artifacts
-          path: target/release/fe
+#  build-mac:
+#    runs-on: macos-latest
+#
+#    steps:
+#      - uses: actions/checkout@v1
+#
+#      - name: Cache Cargo registry
+#        uses: actions/cache@v1
+#        with:
+#          path: ~/.cargo/registry
+#          key: ${{ runner.os }}-stable-cargo-registry-${{ hashFiles('**/Cargo.lock') }}
+#          restore-keys: |
+#            ${{ runner.os }}-stable-cargo-registry-
+#
+#      - name: Cache Cargo index
+#        uses: actions/cache@v1
+#        with:
+#          path: ~/.cargo/git
+#          key: ${{ runner.os }}-stable-cargo-index-${{ hashFiles('**/Cargo.lock') }}
+#          restore-keys: |
+#            ${{ runner.os }}-stable-cargo-index-
+#
+#      - name: Cache Cargo build
+#        uses: actions/cache@v1
+#        with:
+#          path: target/debug
+#          key: ${{ runner.os }}-stable-debug-target-${{ hashFiles('**/Cargo.lock') }}
+#          restore-keys: |
+#            ${{ runner.os }}-stable-debug-target-
+#
+#      - name: Install Rust
+#        run: |
+#          rustup update ${{ matrix.rust }} --no-self-update 
+#          rustup default ${{ matrix.rust }}
+#      - name: Build
+#        run: cargo build --release
+#
+#      - name: Upload build artifacts
+#        uses: actions/upload-artifact@v1
+#        with:
+#          name: macos-build-artifacts
+#          path: target/release/fe

crates/ferrite-gui/Cargo.toml

@@ -5,10 +5,11 @@ edition = "2021"
 
 [dependencies]
 anyhow = { workspace = true }
+cgmath = "0.18.0"
 ferrite-cli = { workspace = true }
 ferrite-core = { workspace = true }
+glyphon = "0.5.0"
 pollster = "0.3.0"
+tracing = { workspace = true }
 wgpu = "0.19.3"
 winit = "0.29.15"
-glyphon = "0.5.0"
-cgmath = "0.18.0"

crates/ferrite-gui/src/lib.rs

@@ -1,4 +1,4 @@
-use std::{iter, sync::Arc, time::Instant};
+use std::{env, iter, sync::Arc, time::Instant};
 
 use anyhow::Result;
 use event_loop_wrapper::EventLoopProxyWrapper;
@@ -61,14 +61,31 @@ impl GuiApp {
         );
         let size = window.inner_size();
 
-        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
-            backends: wgpu::Backends::all(),
+        let mut backends = if cfg!(windows) {
+            wgpu::Backends::DX12
+        } else if cfg!(macos) {
+            wgpu::Backends::PRIMARY
+        } else {
+            wgpu::Backends::all()
+        };
+
+        if let Ok(gpu_backend) = env::var("FERRITE_GPU_BACKEND") {
+            backends = wgpu::util::parse_backends_from_comma_list(&gpu_backend);
+        } else if let Ok(gpu_backend) = env::var("WGPU_BACKEND") {
+            backends = wgpu::util::parse_backends_from_comma_list(&gpu_backend);
+        };
+
+        let instance_descriptor = wgpu::InstanceDescriptor {
+            backends,
             ..Default::default()
-        });
+        };
+
+        let instance = wgpu::Instance::new(instance_descriptor);
+
         let surface = instance.create_surface(window.clone()).unwrap();
         let adapter = instance
             .request_adapter(&wgpu::RequestAdapterOptions {
-                power_preference: wgpu::PowerPreference::HighPerformance,
+                power_preference: wgpu::PowerPreference::None,
                 compatible_surface: Some(&surface),
                 force_fallback_adapter: false,
             })