Cleanup exports

examples/compute/main.c

@@ -16,9 +16,8 @@
 #define BINDINGS_LENGTH (1)
 #define BIND_GROUP_LAYOUTS_LENGTH (1)
 
-void request_adapter_callback(WGPUAdapterId const *received, void *userdata) {
-    WGPUAdapterId *id = (WGPUAdapterId*) userdata;
-    *id = *received;
+void request_adapter_callback(WGPUAdapterId received, void *userdata) {
+    *(WGPUAdapterId*)userdata = received;
 }
 
 void read_buffer_map(

examples/triangle/main.c

@@ -36,9 +36,8 @@
 #define RENDER_PASS_ATTACHMENTS_LENGTH (1)
 #define BIND_GROUP_LAYOUTS_LENGTH (1)
 
-void request_adapter_callback(WGPUAdapterId const *received, void *userdata) {
-    WGPUAdapterId *id = (WGPUAdapterId*) userdata;
-    *id = *received;
+void request_adapter_callback(WGPUAdapterId received, void *userdata) {
+    *(WGPUAdapterId*)userdata = received;
 }
 
 int main() {

ffi/wgpu.h

@@ -649,7 +649,7 @@ typedef struct {
 
 typedef uint32_t WGPUBackendBit;
 
-typedef void (*WGPURequestAdapterCallback)(const WGPUAdapterId *adapter, void *userdata);
+typedef void (*WGPURequestAdapterCallback)(WGPUAdapterId id, void *userdata);
 
 typedef struct {
   WGPUTextureViewId view_id;

wgpu-core/src/device.rs

@@ -600,11 +600,11 @@ impl<B: GfxBackend> Device<B> {
                 }
             };
             match operation {
-                resource::BufferMapOperation::Read(_, on_read, userdata) => {
-                    on_read(status, ptr, userdata)
+                resource::BufferMapOperation::Read(_, on_read) => {
+                    on_read(status, ptr)
                 }
-                resource::BufferMapOperation::Write(_, on_write, userdata) => {
-                    on_write(status, ptr, userdata)
+                resource::BufferMapOperation::Write(_, on_write) => {
+                    on_write(status, ptr)
                 }
             }
         }
@@ -2000,11 +2000,6 @@ impl<F: AllIdentityFilter + IdentityFilter<DeviceId>> Global<F> {
     }
 }
 
-pub type BufferMapReadCallback =
-    extern "C" fn(status: resource::BufferMapAsyncStatus, data: *const u8, userdata: *mut u8);
-pub type BufferMapWriteCallback =
-    extern "C" fn(status: resource::BufferMapAsyncStatus, data: *mut u8, userdata: *mut u8);
-
 impl<F> Global<F> {
     pub fn buffer_map_async<B: GfxBackend>(
         &self,

wgpu-core/src/instance.rs

@@ -17,7 +17,6 @@ use serde::{Deserialize, Serialize};
 pub use hal::adapter::AdapterInfo;
 use hal::{self, adapter::PhysicalDevice as _, queue::QueueFamily as _, Instance as _};
 
-use std::ffi::c_void;
 
 #[derive(Debug)]
 pub struct Instance {
@@ -153,8 +152,6 @@ pub struct DeviceDescriptor {
     pub limits: Limits,
 }
 
-pub type RequestAdapterCallback = extern "C" fn(adapter: *const AdapterId, userdata: *mut c_void);
-
 bitflags::bitflags! {
     #[repr(transparent)]
     #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]

wgpu-core/src/resource.rs

@@ -3,7 +3,6 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 use crate::{
-    device::{BufferMapReadCallback, BufferMapWriteCallback},
     id::{DeviceId, SwapChainId, TextureId},
     track::DUMMY_SELECTOR,
     BufferAddress,
@@ -17,7 +16,7 @@ use hal;
 use rendy_memory::MemoryBlock;
 use smallvec::SmallVec;
 
-use std::borrow::Borrow;
+use std::{borrow::Borrow, fmt};
 
 bitflags::bitflags! {
     #[repr(transparent)]
@@ -62,25 +61,35 @@ pub enum BufferMapAsyncStatus {
     ContextLost,
 }
 
-#[derive(Clone, Debug)]
 pub enum BufferMapOperation {
-    Read(std::ops::Range<u64>, BufferMapReadCallback, *mut u8),
-    Write(std::ops::Range<u64>, BufferMapWriteCallback, *mut u8),
+    Read(std::ops::Range<u64>, Box<dyn FnOnce(BufferMapAsyncStatus, *const u8)>),
+    Write(std::ops::Range<u64>, Box<dyn FnOnce(BufferMapAsyncStatus, *mut u8)>),
 }
 
+//TODO: clarify if/why this is needed here
 unsafe impl Send for BufferMapOperation {}
 unsafe impl Sync for BufferMapOperation {}
 
+impl fmt::Debug for BufferMapOperation {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        let (op, range) = match *self {
+            BufferMapOperation::Read(ref range, _) => ("read", range),
+            BufferMapOperation::Write(ref range, _) => ("write", range),
+        };
+        write!(fmt, "BufferMapOperation <{}> of range {:?}", op, range)
+    }
+}
+
 impl BufferMapOperation {
     pub(crate) fn call_error(self) {
         match self {
-            BufferMapOperation::Read(_, callback, userdata) => {
+            BufferMapOperation::Read(_, callback) => {
                 log::error!("wgpu_buffer_map_read_async failed: buffer mapping is pending");
-                callback(BufferMapAsyncStatus::Error, std::ptr::null_mut(), userdata);
+                callback(BufferMapAsyncStatus::Error, std::ptr::null());
             }
-            BufferMapOperation::Write(_, callback, userdata) => {
+            BufferMapOperation::Write(_, callback) => {
                 log::error!("wgpu_buffer_map_write_async failed: buffer mapping is pending");
-                callback(BufferMapAsyncStatus::Error, std::ptr::null_mut(), userdata);
+                callback(BufferMapAsyncStatus::Error, std::ptr::null_mut());
             }
         }
     }

wgpu-native/src/device.rs

@@ -4,6 +4,12 @@ use core::{gfx_select, hub::Token, id};
 
 use std::{marker::PhantomData, slice};
 
+pub type RequestAdapterCallback =
+    unsafe extern "C" fn(id: id::AdapterId, userdata: *mut std::ffi::c_void);
+pub type BufferMapReadCallback =
+    unsafe extern "C" fn(status: core::resource::BufferMapAsyncStatus, data: *const u8, userdata: *mut u8);
+pub type BufferMapWriteCallback =
+    unsafe extern "C" fn(status: core::resource::BufferMapAsyncStatus, data: *mut u8, userdata: *mut u8);
 
 pub fn wgpu_create_surface(raw_handle: raw_window_handle::RawWindowHandle) -> id::SurfaceId {
     use raw_window_handle::RawWindowHandle as Rwh;
@@ -116,17 +122,19 @@ pub extern "C" fn wgpu_create_surface_from_windows_hwnd(
 pub extern "C" fn wgpu_request_adapter_async(
     desc: Option<&core::instance::RequestAdapterOptions>,
     mask: core::instance::BackendBit,
-    callback: core::instance::RequestAdapterCallback,
+    callback: RequestAdapterCallback,
     userdata: *mut std::ffi::c_void,
 ) {
     let id = GLOBAL.pick_adapter(
         &desc.cloned().unwrap_or_default(),
         core::instance::AdapterInputs::Mask(mask, || PhantomData),
     );
-    callback(
-        id.as_ref().map_or(&id::AdapterId::ERROR, |x| x as *const _),
-        userdata,
-    );
+    unsafe {
+        callback(
+            id.unwrap_or(id::AdapterId::ERROR),
+            userdata,
+        )
+    };
 }
 
 #[no_mangle]
@@ -313,11 +321,15 @@ pub extern "C" fn wgpu_buffer_map_read_async(
     buffer_id: id::BufferId,
     start: core::BufferAddress,
     size: core::BufferAddress,
-    callback: core::device::BufferMapReadCallback,
+    callback: BufferMapReadCallback,
     userdata: *mut u8,
 ) {
-    let operation =
-        core::resource::BufferMapOperation::Read(start .. start + size, callback, userdata);
+    let operation = core::resource::BufferMapOperation::Read(
+        start .. start + size,
+        Box::new(move |status, data| unsafe {
+            callback(status, data, userdata)
+        }),
+    );
     gfx_select!(buffer_id => GLOBAL.buffer_map_async(buffer_id, core::resource::BufferUsage::MAP_READ, operation))
 }
 
@@ -326,11 +338,15 @@ pub extern "C" fn wgpu_buffer_map_write_async(
     buffer_id: id::BufferId,
     start: core::BufferAddress,
     size: core::BufferAddress,
-    callback: core::device::BufferMapWriteCallback,
+    callback: BufferMapWriteCallback,
     userdata: *mut u8,
 ) {
-    let operation =
-        core::resource::BufferMapOperation::Write(start .. start + size, callback, userdata);
+    let operation = core::resource::BufferMapOperation::Write(
+        start .. start + size,
+        Box::new(move |status, data| unsafe {
+            callback(status, data, userdata)
+        }),
+    );
     gfx_select!(buffer_id => GLOBAL.buffer_map_async(buffer_id, core::resource::BufferUsage::MAP_WRITE, operation))
 }
 

wgpu-native/src/lib.rs

@@ -1,7 +1,10 @@
 use std::sync::Arc;
 
-pub mod command;
-pub mod device;
+mod command;
+mod device;
+
+pub use self::command::*;
+pub use self::device::*;
 
 type Global = core::hub::Global<parking_lot::Mutex<core::hub::IdentityManager>>;