From f5d3d5f10a8c83e25a8da450af4fd3ad701cab7f Mon Sep 17 00:00:00 2001
From: Luke Street <luke@street.dev>
Date: Tue, 29 Jul 2025 20:49:09 -0600
Subject: [PATCH] gui: Split OpenGL into OpenGL (glow), OpenGL ES (wgpu)

---
 objdiff-gui/src/app.rs            | 4 ++--
 objdiff-gui/src/main.rs           | 3 ++-
 objdiff-gui/src/views/graphics.rs | 8 ++++++--
 3 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/objdiff-gui/src/app.rs b/objdiff-gui/src/app.rs
index bb1580a..ec0b663 100644
--- a/objdiff-gui/src/app.rs
+++ b/objdiff-gui/src/app.rs
@@ -465,7 +465,7 @@ impl App {
                 Backend::Vulkan => "Vulkan",
                 Backend::Metal => "Metal",
                 Backend::Dx12 => "DirectX 12",
-                Backend::Gl => "OpenGL",
+                Backend::Gl => "OpenGL ES",
                 Backend::BrowserWebGpu => "WebGPU",
             }
             .to_string();
@@ -474,7 +474,7 @@ impl App {
         #[cfg(feature = "glow")]
         if let Some(gl) = &cc.gl {
             use eframe::glow::HasContext;
-            app.view_state.graphics_state.active_backend = "OpenGL (Fallback)".to_string();
+            app.view_state.graphics_state.active_backend = "OpenGL".to_string();
             app.view_state.graphics_state.active_device =
                 unsafe { gl.get_parameter_string(0x1F01) }; // GL_RENDERER
         }
diff --git a/objdiff-gui/src/main.rs b/objdiff-gui/src/main.rs
index 2687f01..f573030 100644
--- a/objdiff-gui/src/main.rs
+++ b/objdiff-gui/src/main.rs
@@ -95,7 +95,8 @@ fn main() -> ExitCode {
                         GraphicsBackend::Dx12 => wgpu::Backends::DX12,
                         GraphicsBackend::Metal => wgpu::Backends::METAL,
                         GraphicsBackend::Vulkan => wgpu::Backends::VULKAN,
-                        GraphicsBackend::OpenGL => wgpu::Backends::GL,
+                        GraphicsBackend::OpenGLES => wgpu::Backends::GL,
+                        GraphicsBackend::OpenGL => wgpu::Backends::empty(),
                     };
                     WgpuSetup::CreateNew(setup)
                 }
diff --git a/objdiff-gui/src/views/graphics.rs b/objdiff-gui/src/views/graphics.rs
index 1121a11..177db9e 100644
--- a/objdiff-gui/src/views/graphics.rs
+++ b/objdiff-gui/src/views/graphics.rs
@@ -26,7 +26,8 @@ pub enum GraphicsBackend {
     Vulkan,
     Metal,
     Dx12,
-    OpenGL,
+    OpenGL,   // glow
+    OpenGLES, // wgpu
 }
 
 static ALL_BACKENDS: &[GraphicsBackend] = &[
@@ -35,6 +36,7 @@ static ALL_BACKENDS: &[GraphicsBackend] = &[
     GraphicsBackend::Metal,
     GraphicsBackend::Dx12,
     GraphicsBackend::OpenGL,
+    GraphicsBackend::OpenGLES,
 ];
 
 #[derive(Clone, Debug, Default, serde::Deserialize, serde::Serialize)]
@@ -67,7 +69,8 @@ impl GraphicsBackend {
             }
             GraphicsBackend::Metal => cfg!(all(feature = "wgpu", target_os = "macos")),
             GraphicsBackend::Dx12 => cfg!(all(feature = "wgpu", target_os = "windows")),
-            GraphicsBackend::OpenGL => true,
+            GraphicsBackend::OpenGL => cfg!(feature = "glow"),
+            GraphicsBackend::OpenGLES => cfg!(all(feature = "wgpu", target_os = "windows")),
         }
     }
 
@@ -78,6 +81,7 @@ impl GraphicsBackend {
             GraphicsBackend::Metal => "Metal",
             GraphicsBackend::Dx12 => "DirectX 12",
             GraphicsBackend::OpenGL => "OpenGL",
+            GraphicsBackend::OpenGLES => "OpenGL ES",
         }
     }
 }