diff --git a/Cargo.lock b/Cargo.lock
index 2a1abd3..c4a569c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -252,7 +252,7 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 [[package]]
 name = "gfx-backend-dx12"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#91ec6303fded63498b01e4a55e8ebe6768d3c2cc"
+source = "git+https://github.com/gfx-rs/gfx#505e8057803d8cc0302b5fdcfe7ae807b8f3b8cf"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "derivative 1.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -268,7 +268,7 @@ dependencies = [
 [[package]]
 name = "gfx-backend-metal"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#91ec6303fded63498b01e4a55e8ebe6768d3c2cc"
+source = "git+https://github.com/gfx-rs/gfx#505e8057803d8cc0302b5fdcfe7ae807b8f3b8cf"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "block 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -290,7 +290,7 @@ dependencies = [
 [[package]]
 name = "gfx-backend-vulkan"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#91ec6303fded63498b01e4a55e8ebe6768d3c2cc"
+source = "git+https://github.com/gfx-rs/gfx#505e8057803d8cc0302b5fdcfe7ae807b8f3b8cf"
 dependencies = [
  "ash 0.24.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "byteorder 1.2.3 (registry+https://github.com/rust-lang/crates.io-index)",
@@ -308,7 +308,7 @@ dependencies = [
 [[package]]
 name = "gfx-hal"
 version = "0.1.0"
-source = "git+https://github.com/gfx-rs/gfx#91ec6303fded63498b01e4a55e8ebe6768d3c2cc"
+source = "git+https://github.com/gfx-rs/gfx#505e8057803d8cc0302b5fdcfe7ae807b8f3b8cf"
 dependencies = [
  "bitflags 1.0.3 (registry+https://github.com/rust-lang/crates.io-index)",
  "failure 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Makefile b/Makefile
index ab576ea..4352ab9 100644
--- a/Makefile
+++ b/Makefile
@@ -104,4 +104,4 @@ clean:
 	cargo clean
 
 cherry: $(TARGET)
-	cd $(CHERRY_DIR) && RUST_LOG=warn LD_LIBRARY_PATH=$(FULL_LIBRARY_PATH) go run server.go
+	cd $(CHERRY_DIR) && rm -f Cherry.db && RUST_LOG=warn LD_LIBRARY_PATH=$(FULL_LIBRARY_PATH) go run server.go
diff --git a/libportability-gfx/src/conv.rs b/libportability-gfx/src/conv.rs
index d7b3b2a..b47a3b0 100644
--- a/libportability-gfx/src/conv.rs
+++ b/libportability-gfx/src/conv.rs
@@ -12,6 +12,8 @@ pub fn limits_from_hal(limits: Limits) -> VkPhysicalDeviceLimits {
         maxImageDimension2D: limits.max_texture_size as _,
         maxImageDimension3D: limits.max_texture_size as _,
         maxImageDimensionCube: limits.max_texture_size as _,
+        maxFramebufferWidth: limits.max_texture_size as _, //TODO
+        maxFramebufferHeight: limits.max_texture_size as _, //TODO
         maxTexelBufferElements: limits.max_texture_size as _, //TODO
         maxTessellationPatchSize: limits.max_patch_size as _,
         maxViewports: limits.max_viewports as _,
diff --git a/libportability-gfx/src/impls.rs b/libportability-gfx/src/impls.rs
index 3787a23..754f87b 100644
--- a/libportability-gfx/src/impls.rs
+++ b/libportability-gfx/src/impls.rs
@@ -10,9 +10,7 @@ use hal::command::RawCommandBuffer;
 use hal::queue::RawCommandQueue;
 
 use std::ffi::{CStr, CString};
-use std::mem;
-#[cfg(feature = "renderdoc")]
-use std::ptr;
+use std::{mem, ptr};
 #[cfg(feature = "renderdoc")]
 use std::os::raw::c_void;
 
@@ -596,11 +594,12 @@ pub extern "C" fn gfxCreateDevice(
 #[inline]
 pub extern "C" fn gfxDestroyDevice(gpu: VkDevice, _pAllocator: *const VkAllocationCallbacks) {
     // release all the owned command queues
-    if let Some(mut d) = gpu.unbox() {
+    if let Some(d) = gpu.unbox() {
         #[cfg(feature = "renderdoc")]
         {
             use renderdoc::api::RenderDocV100;
             let device = gpu.capturing as *mut c_void;
+            let mut d = d;
             d.renderdoc.end_frame_capture(device as *mut _, ptr::null());
         }
 
@@ -1142,10 +1141,12 @@ pub extern "C" fn gfxCreateEvent(
 #[inline]
 pub extern "C" fn gfxDestroyEvent(
     _gpu: VkDevice,
-    _event: VkEvent,
+    event: VkEvent,
     _pAllocator: *const VkAllocationCallbacks,
 ) {
-    unimplemented!()
+    if event != ptr::null_mut() {
+        unimplemented!()
+    }
 }
 #[inline]
 pub extern "C" fn gfxGetEventStatus(_gpu: VkDevice, _event: VkEvent) -> VkResult {
@@ -1172,10 +1173,12 @@ pub extern "C" fn gfxCreateQueryPool(
 #[inline]
 pub extern "C" fn gfxDestroyQueryPool(
     _gpu: VkDevice,
-    _queryPool: VkQueryPool,
+    queryPool: VkQueryPool,
     _pAllocator: *const VkAllocationCallbacks,
 ) {
-    unimplemented!()
+    if queryPool != ptr::null_mut() {
+        unimplemented!()
+    }
 }
 #[inline]
 pub extern "C" fn gfxGetQueryPoolResults(
@@ -2540,9 +2543,10 @@ pub extern "C" fn gfxDestroyRenderPass(
 pub extern "C" fn gfxGetRenderAreaGranularity(
     _gpu: VkDevice,
     _renderPass: VkRenderPass,
-    _pGranularity: *mut VkExtent2D,
+    pGranularity: *mut VkExtent2D,
 ) {
-    unimplemented!()
+    let granularity = VkExtent2D { width: 1, height: 1 }; //TODO?
+    unsafe { *pGranularity = granularity };
 }
 
 #[inline]