allow creation of wgpu_hal textures for gles backend

CHANGELOG.md

@@ -134,6 +134,7 @@ both `raw_window_handle::HasRawWindowHandle` and `raw_window_handle::HasRawDispl
 - Split Blendability and Filterability into Two Different TextureFormatFeatureFlags; by @stakka in [#3012](https://github.com/gfx-rs/wgpu/pull/3012)
 - Expose `alpha_mode` on SurfaceConfiguration, by @jinleili in [#2836](https://github.com/gfx-rs/wgpu/pull/2836)
 - Introduce fields for driver name and info in `AdapterInfo`, by @i509VCB in [#3037](https://github.com/gfx-rs/wgpu/pull/3037)
+- Add way to create gles hal textures from raw gl names to allow externally managed textures. By @i509VCB [#3046](https://github.com/gfx-rs/wgpu/pull/3046)
 - Implemented `copy_external_image_to_texture` on WebGPU, by @ybiletskyi in [#2781](https://github.com/gfx-rs/wgpu/pull/2781)
 
 ### Bug Fixes
@@ -202,6 +203,7 @@ both `raw_window_handle::HasRawWindowHandle` and `raw_window_handle::HasRawDispl
 - Provide a means for `wgpu` users to access `vk::Queue` and the queue index. By @anlumo in [#2950](https://github.com/gfx-rs/wgpu/pull/2950)
 - Use the use effective api version for determining device features instead of wrongly assuming `VkPhysicalDeviceProperties.apiVersion`
   is the actual version of the device. By @i509VCB in [#3011](https://github.com/gfx-rs/wgpu/pull/3011)
+- `DropGuard` has been moved to the root of the wgpu-hal crate. By @i509VCB [#3046](https://github.com/gfx-rs/wgpu/pull/3046)
 
 #### GLES
 

wgpu-hal/Cargo.toml

@@ -54,7 +54,9 @@ gpu-descriptor = { version = "0.2", optional = true }
 smallvec = { version = "1", optional = true, features = ["union"] }
 
 # backend: Gles
-glow = { version = "0.11.1", optional = true }
+#glow = { version = "0.11.2", optional = true }
+# TODO: New glow release
+glow = { git = "https://github.com/grovesNL/glow/", rev = "c8a011fcd57a5c68cc917ed394baa484bdefc909", optional = true }
 
 # backend: Dx12
 bit-set = { version = "0.5", optional = true }

wgpu-hal/src/auxil/mod.rs

@@ -66,6 +66,17 @@ pub fn align_to(value: u32, alignment: u32) -> u32 {
 }
 
 impl crate::CopyExtent {
+    pub fn map_extent_to_copy_size(extent: &wgt::Extent3d, dim: wgt::TextureDimension) -> Self {
+        Self {
+            width: extent.width,
+            height: extent.height,
+            depth: match dim {
+                wgt::TextureDimension::D1 | wgt::TextureDimension::D2 => 1,
+                wgt::TextureDimension::D3 => extent.depth_or_array_layers,
+            },
+        }
+    }
+
     pub fn min(&self, other: &Self) -> Self {
         Self {
             width: self.width.min(other.width),

wgpu-hal/src/gles/device.rs

@@ -10,6 +10,9 @@ use std::{
 #[cfg(not(target_arch = "wasm32"))]
 use std::mem;
 
+#[cfg(any(not(target_arch = "wasm32"), feature = "emscripten"))]
+use std::num::NonZeroU32;
+
 type ShaderStage<'a> = (
     naga::ShaderStage,
     &'a crate::ProgrammableStage<'a, super::Api>,
@@ -84,6 +87,77 @@ impl CompilationContext<'_> {
 }
 
 impl super::Device {
+    /// # Safety
+    ///
+    /// - `name` must be created respecting `desc`
+    /// - `name` must be a texture
+    /// - If `drop_guard` is [`None`], wgpu-hal will take ownership of the texture. If `drop_guard` is
+    ///   [`Some`], the texture must be valid until the drop implementation
+    ///   of the drop guard is called.
+    #[cfg(any(not(target_arch = "wasm32"), feature = "emscripten"))]
+    pub unsafe fn texture_from_raw(
+        &self,
+        name: NonZeroU32,
+        desc: &crate::TextureDescriptor,
+        drop_guard: Option<crate::DropGuard>,
+    ) -> super::Texture {
+        let mut copy_size = crate::CopyExtent::map_extent_to_copy_size(&desc.size, desc.dimension);
+
+        let (target, _, is_cubemap) = super::Texture::get_info_from_desc(&mut copy_size, desc);
+
+        super::Texture {
+            inner: super::TextureInner::Texture {
+                raw: glow::NativeTexture(name),
+                target,
+            },
+            drop_guard,
+            mip_level_count: desc.mip_level_count,
+            array_layer_count: if desc.dimension == wgt::TextureDimension::D2 {
+                desc.size.depth_or_array_layers
+            } else {
+                1
+            },
+            format: desc.format,
+            format_desc: self.shared.describe_texture_format(desc.format),
+            copy_size,
+            is_cubemap,
+        }
+    }
+
+    /// # Safety
+    ///
+    /// - `name` must be created respecting `desc`
+    /// - `name` must be a renderbuffer
+    /// - If `drop_guard` is [`None`], wgpu-hal will take ownership of the renderbuffer. If `drop_guard` is
+    ///   [`Some`], the renderbuffer must be valid until the drop implementation
+    ///   of the drop guard is called.
+    #[cfg(any(not(target_arch = "wasm32"), feature = "emscripten"))]
+    pub unsafe fn texture_from_raw_renderbuffer(
+        &self,
+        name: NonZeroU32,
+        desc: &crate::TextureDescriptor,
+        drop_guard: Option<crate::DropGuard>,
+    ) -> super::Texture {
+        let copy_size = crate::CopyExtent::map_extent_to_copy_size(&desc.size, desc.dimension);
+
+        super::Texture {
+            inner: super::TextureInner::Renderbuffer {
+                raw: glow::NativeRenderbuffer(name),
+            },
+            drop_guard,
+            mip_level_count: desc.mip_level_count,
+            array_layer_count: if desc.dimension == wgt::TextureDimension::D2 {
+                desc.size.depth_or_array_layers
+            } else {
+                1
+            },
+            format: desc.format,
+            format_desc: self.shared.describe_texture_format(desc.format),
+            copy_size,
+            is_cubemap: false,
+        }
+    }
+
     unsafe fn compile_shader(
         gl: &glow::Context,
         shader: &str,
@@ -581,32 +655,8 @@ impl crate::Device<super::Api> for super::Device {
             (super::TextureInner::Renderbuffer { raw }, false)
         } else {
             let raw = gl.create_texture().unwrap();
-            let (target, is_3d, is_cubemap) = match desc.dimension {
-                wgt::TextureDimension::D1 | wgt::TextureDimension::D2 => {
-                    if desc.size.depth_or_array_layers > 1 {
-                        //HACK: detect a cube map
-                        let cube_count = if desc.size.width == desc.size.height
-                            && desc.size.depth_or_array_layers % 6 == 0
-                            && desc.sample_count == 1
-                        {
-                            Some(desc.size.depth_or_array_layers / 6)
-                        } else {
-                            None
-                        };
-                        match cube_count {
-                            None => (glow::TEXTURE_2D_ARRAY, true, false),
-                            Some(1) => (glow::TEXTURE_CUBE_MAP, false, true),
-                            Some(_) => (glow::TEXTURE_CUBE_MAP_ARRAY, true, true),
-                        }
-                    } else {
-                        (glow::TEXTURE_2D, false, false)
-                    }
-                }
-                wgt::TextureDimension::D3 => {
-                    copy_size.depth = desc.size.depth_or_array_layers;
-                    (glow::TEXTURE_3D, true, false)
-                }
-            };
+            let (target, is_3d, is_cubemap) =
+                super::Texture::get_info_from_desc(&mut copy_size, desc);
 
             gl.bind_texture(target, Some(raw));
             //Note: this has to be done before defining the storage!
@@ -663,6 +713,7 @@ impl crate::Device<super::Api> for super::Device {
 
         Ok(super::Texture {
             inner,
+            drop_guard: None,
             mip_level_count: desc.mip_level_count,
             array_layer_count: if desc.dimension == wgt::TextureDimension::D2 {
                 desc.size.depth_or_array_layers
@@ -676,16 +727,22 @@ impl crate::Device<super::Api> for super::Device {
         })
     }
     unsafe fn destroy_texture(&self, texture: super::Texture) {
-        let gl = &self.shared.context.lock();
-        match texture.inner {
-            super::TextureInner::Renderbuffer { raw, .. } => {
-                gl.delete_renderbuffer(raw);
-            }
-            super::TextureInner::DefaultRenderbuffer => {}
-            super::TextureInner::Texture { raw, .. } => {
-                gl.delete_texture(raw);
+        if texture.drop_guard.is_none() {
+            let gl = &self.shared.context.lock();
+            match texture.inner {
+                super::TextureInner::Renderbuffer { raw, .. } => {
+                    gl.delete_renderbuffer(raw);
+                }
+                super::TextureInner::DefaultRenderbuffer => {}
+                super::TextureInner::Texture { raw, .. } => {
+                    gl.delete_texture(raw);
+                }
             }
         }
+
+        // For clarity, we explicitly drop the drop guard. Although this has no real semantic effect as the
+        // end of the scope will drop the drop guard since this function takes ownership of the texture.
+        drop(texture.drop_guard);
     }
 
     unsafe fn create_texture_view(

wgpu-hal/src/gles/egl.rs

@@ -1241,6 +1241,7 @@ impl crate::Surface<super::Api> for Surface {
             inner: super::TextureInner::Renderbuffer {
                 raw: sc.renderbuffer,
             },
+            drop_guard: None,
             array_layer_count: 1,
             mip_level_count: 1,
             format: sc.format,

wgpu-hal/src/gles/mod.rs

@@ -68,6 +68,8 @@ mod conv;
 mod device;
 mod queue;
 
+use crate::{CopyExtent, TextureDescriptor};
+
 #[cfg(any(not(target_arch = "wasm32"), feature = "emscripten"))]
 pub use self::egl::{AdapterContext, AdapterContextLock};
 #[cfg(any(not(target_arch = "wasm32"), feature = "emscripten"))]
@@ -265,19 +267,21 @@ impl TextureInner {
 #[derive(Debug)]
 pub struct Texture {
     inner: TextureInner,
+    drop_guard: Option<crate::DropGuard>,
     mip_level_count: u32,
     array_layer_count: u32,
     format: wgt::TextureFormat,
     #[allow(unused)]
     format_desc: TextureFormatDesc,
-    copy_size: crate::CopyExtent,
+    copy_size: CopyExtent,
     is_cubemap: bool,
 }
 
 impl Texture {
     pub fn default_framebuffer(format: wgt::TextureFormat) -> Self {
         Self {
             inner: TextureInner::DefaultRenderbuffer,
+            drop_guard: None,
             mip_level_count: 1,
             array_layer_count: 1,
             format,
@@ -286,14 +290,47 @@ impl Texture {
                 external: 0,
                 data_type: 0,
             },
-            copy_size: crate::CopyExtent {
+            copy_size: CopyExtent {
                 width: 0,
                 height: 0,
                 depth: 0,
             },
             is_cubemap: false,
         }
     }
+
+    /// Returns the `target`, whether the image is 3d and whether the image is a cubemap.
+    fn get_info_from_desc(
+        copy_size: &mut CopyExtent,
+        desc: &TextureDescriptor,
+    ) -> (u32, bool, bool) {
+        match desc.dimension {
+            wgt::TextureDimension::D1 | wgt::TextureDimension::D2 => {
+                if desc.size.depth_or_array_layers > 1 {
+                    //HACK: detect a cube map
+                    let cube_count = if desc.size.width == desc.size.height
+                        && desc.size.depth_or_array_layers % 6 == 0
+                        && desc.sample_count == 1
+                    {
+                        Some(desc.size.depth_or_array_layers / 6)
+                    } else {
+                        None
+                    };
+                    match cube_count {
+                        None => (glow::TEXTURE_2D_ARRAY, true, false),
+                        Some(1) => (glow::TEXTURE_CUBE_MAP, false, true),
+                        Some(_) => (glow::TEXTURE_CUBE_MAP_ARRAY, true, true),
+                    }
+                } else {
+                    (glow::TEXTURE_2D, false, false)
+                }
+            }
+            wgt::TextureDimension::D3 => {
+                copy_size.depth = desc.size.depth_or_array_layers;
+                (glow::TEXTURE_3D, true, false)
+            }
+        }
+    }
 }
 
 #[derive(Clone, Debug)]

wgpu-hal/src/gles/web.rs

@@ -327,6 +327,7 @@ impl crate::Surface<super::Api> for Surface {
                 raw: self.texture.unwrap(),
                 target: glow::TEXTURE_2D,
             },
+            drop_guard: None,
             array_layer_count: 1,
             mip_level_count: 1,
             format: sc.format,

wgpu-hal/src/lib.rs

@@ -106,7 +106,10 @@ pub type Label<'a> = Option<&'a str>;
 pub type MemoryRange = Range<wgt::BufferAddress>;
 pub type FenceValue = u64;
 
-#[derive(Clone, Debug, Eq, PartialEq, Error)]
+/// Drop guard to signal wgpu-hal is no longer using an externally created object.
+pub type DropGuard = Box<dyn std::any::Any + Send + Sync>;
+
+#[derive(Clone, Debug, PartialEq, Eq, Error)]
 pub enum DeviceError {
     #[error("out of memory")]
     OutOfMemory,

wgpu-hal/src/vulkan/device.rs

@@ -609,7 +609,7 @@ impl super::Device {
     pub unsafe fn texture_from_raw(
         vk_image: vk::Image,
         desc: &crate::TextureDescriptor,
-        drop_guard: Option<super::DropGuard>,
+        drop_guard: Option<crate::DropGuard>,
     ) -> super::Texture {
         super::Texture {
             raw: vk_image,
@@ -619,7 +619,7 @@ impl super::Device {
             aspects: crate::FormatAspects::from(desc.format),
             format_info: desc.format.describe(),
             raw_flags: vk::ImageCreateFlags::empty(),
-            copy_size: conv::map_extent_to_copy_size(&desc.size, desc.dimension),
+            copy_size: crate::CopyExtent::map_extent_to_copy_size(&desc.size, desc.dimension),
         }
     }
 

wgpu-hal/src/vulkan/instance.rs

@@ -229,7 +229,7 @@ impl super::Instance {
         extensions: Vec<&'static CStr>,
         flags: crate::InstanceFlags,
         has_nv_optimus: bool,
-        drop_guard: Option<super::DropGuard>,
+        drop_guard: Option<crate::DropGuard>,
     ) -> Result<Self, crate::InstanceError> {
         log::info!("Instance version: 0x{:x}", driver_api_version);
 

wgpu-hal/src/vulkan/mod.rs

@@ -43,8 +43,6 @@ use parking_lot::Mutex;
 const MILLIS_TO_NANOS: u64 = 1_000_000;
 const MAX_TOTAL_ATTACHMENTS: usize = crate::MAX_COLOR_ATTACHMENTS * 2 + 1;
 
-pub type DropGuard = Box<dyn std::any::Any + Send + Sync>;
-
 #[derive(Clone)]
 pub struct Api;
 
@@ -82,7 +80,7 @@ struct DebugUtils {
 pub struct InstanceShared {
     raw: ash::Instance,
     extensions: Vec<&'static CStr>,
-    drop_guard: Option<DropGuard>,
+    drop_guard: Option<crate::DropGuard>,
     flags: crate::InstanceFlags,
     debug_utils: Option<DebugUtils>,
     get_physical_device_properties: Option<khr::GetPhysicalDeviceProperties2>,
@@ -347,7 +345,7 @@ pub struct Buffer {
 #[derive(Debug)]
 pub struct Texture {
     raw: vk::Image,
-    drop_guard: Option<DropGuard>,
+    drop_guard: Option<crate::DropGuard>,
     block: Option<gpu_alloc::MemoryBlock<vk::DeviceMemory>>,
     usage: crate::TextureUses,
     aspects: crate::FormatAspects,