Create gles buffers with DYNAMIC_DRAW instead of STATIC_DRAW

wgpu-hal/src/gles/device.rs

@@ -450,12 +450,6 @@ impl crate::Device<super::Api> for super::Device {
 
         let gl = &self.shared.context.lock();
 
-        let target = if desc.usage.contains(crate::BufferUses::INDEX) {
-            glow::ELEMENT_ARRAY_BUFFER
-        } else {
-            glow::ARRAY_BUFFER
-        };
-
         let is_host_visible = desc
             .usage
             .intersects(crate::BufferUses::MAP_READ | crate::BufferUses::MAP_WRITE);
@@ -499,7 +493,10 @@ 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) };
         }