Create gles buffers with DYNAMIC_DRAW instead of STATIC_DRAW (#3391)

CHANGELOG.md

@@ -196,6 +196,7 @@ Additionally `Surface::get_default_config` now returns an Option and returns Non
 - Fixed WebGL not displaying srgb targets correctly if a non-screen filling viewport was previously set. By @Wumpf in [#3093](https://github.com/gfx-rs/wgpu/pull/3093)
 - Fix disallowing multisampling for float textures if otherwise supported. By @Wumpf in [#3183](https://github.com/gfx-rs/wgpu/pull/3183)
 - Fix a panic when creating a pipeline with opaque types other than samplers (images and atomic counters). By @James2022-rgb in [#3361](https://github.com/gfx-rs/wgpu/pull/3361)
+- Fix uniform buffers being empty on some vendors. By @Dinnerbone in [#3391](https://github.com/gfx-rs/wgpu/pull/3391)
 
 #### Vulkan
 

wgpu-hal/src/gles/device.rs

@@ -500,7 +500,10 @@ impl crate::Device<super::Api> for super::Device {
                     glow::DYNAMIC_DRAW
                 }
             } else {
-                glow::STATIC_DRAW
+                // Even if the usage doesn't contain SRC_READ, we update it internally at least once
+                // Some vendors take usage very literally and STATIC_DRAW will freeze us with an empty buffer
+                // https://github.com/gfx-rs/wgpu/issues/3371
+                glow::DYNAMIC_DRAW
             };
             unsafe { gl.buffer_data_size(target, raw_size, usage) };
         }