fix(hal): adjust the conditions when F16_IN_F32 is available

Author: andyleiserson

wgpu-hal/src/gles/adapter.rs

@@ -384,7 +384,8 @@ impl super::Adapter {
         let mut downlevel_flags = wgt::DownlevelFlags::empty()
             | wgt::DownlevelFlags::NON_POWER_OF_TWO_MIPMAPPED_TEXTURES
             | wgt::DownlevelFlags::CUBE_ARRAY_TEXTURES
-            | wgt::DownlevelFlags::COMPARISON_SAMPLERS;
+            | wgt::DownlevelFlags::COMPARISON_SAMPLERS
+            | wgt::DownlevelFlags::SHADER_F16_IN_F32;
         downlevel_flags.set(wgt::DownlevelFlags::COMPUTE_SHADERS, supports_compute);
         downlevel_flags.set(
             wgt::DownlevelFlags::FRAGMENT_WRITABLE_STORAGE,

wgpu-hal/src/vulkan/adapter.rs

@@ -575,7 +575,8 @@ impl PhysicalDeviceFeatures {
             | Df::INDIRECT_EXECUTION
             | Df::VIEW_FORMATS
             | Df::UNRESTRICTED_EXTERNAL_TEXTURE_COPIES
-            | Df::NONBLOCKING_QUERY_RESOLVE;
+            | Df::NONBLOCKING_QUERY_RESOLVE
+            | Df::SHADER_F16_IN_F32;
 
         dl_flags.set(
             Df::SURFACE_VIEW_FORMATS,
@@ -1693,9 +1694,9 @@ impl super::Instance {
             );
         };
 
-        if info.driver_info.contains("Mesa ") {
+        if info.driver == "llvmpipe" {
             // The `F16_IN_F32` instructions do not normally require native `F16` support, but on
-            // Mesa, they do.
+            // llvmpipe, they do.
             downlevel_flags.set(
                 wgt::DownlevelFlags::SHADER_F16_IN_F32,
                 available_features.contains(wgt::Features::SHADER_F16),