Fix generic bounds on buffer mapping

Cargo.toml

@@ -28,7 +28,7 @@ version = "0.4"
 git = "https://github.com/gfx-rs/wgpu"
 rev = "73b33ea76e2f91b3114aa7640b1d60518d39f915"
 
-[dependencies.core]
+[dependencies.wgc]
 package = "wgpu-core"
 version = "0.1"
 git = "https://github.com/gfx-rs/wgpu"

examples/cube/main.rs

@@ -1,7 +1,8 @@
 #[path = "../framework.rs"]
 mod framework;
 
-#[derive(Clone, Copy)]
+#[repr(C)]
+#[derive(Clone, Copy, zerocopy::AsBytes, zerocopy::FromBytes)]
 struct Vertex {
     _pos: [f32; 4],
     _tex_coord: [f32; 2],

examples/mipmap/main.rs

@@ -3,7 +3,8 @@ mod framework;
 
 const TEXTURE_FORMAT: wgpu::TextureFormat = wgpu::TextureFormat::Rgba8UnormSrgb;
 
-#[derive(Clone, Copy)]
+#[repr(C)]
+#[derive(Clone, Copy, zerocopy::AsBytes, zerocopy::FromBytes)]
 struct Vertex {
     #[allow(dead_code)]
     pos: [f32; 4],

examples/msaa-line/main.rs

@@ -10,7 +10,8 @@
 #[path = "../framework.rs"]
 mod framework;
 
-#[derive(Clone, Copy)]
+#[repr(C)]
+#[derive(Clone, Copy, zerocopy::AsBytes, zerocopy::FromBytes)]
 struct Vertex {
     _pos:   [f32; 2],
     _color: [f32; 4],

examples/shadow/main.rs

@@ -3,7 +3,9 @@ use std::{mem, ops::Range, rc::Rc};
 #[path = "../framework.rs"]
 mod framework;
 
-#[derive(Clone, Copy)]
+#[repr(C)]
+#[derive(Clone, Copy, zerocopy::AsBytes, zerocopy::FromBytes)]
+
 struct Vertex {
     _pos: [i8; 4],
     _normal: [i8; 4],
@@ -95,7 +97,7 @@ struct Light {
 }
 
 #[repr(C)]
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, zerocopy::AsBytes, zerocopy::FromBytes)]
 struct LightRaw {
     proj: [[f32; 4]; 4],
     pos: [f32; 4],
@@ -124,16 +126,16 @@ impl Light {
 }
 
 #[repr(C)]
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, zerocopy::AsBytes, zerocopy::FromBytes)]
 struct ForwardUniforms {
     proj: [[f32; 4]; 4],
     num_lights: [u32; 4],
 }
 
 #[repr(C)]
-#[derive(Clone, Copy)]
+#[derive(Clone, Copy, zerocopy::AsBytes, zerocopy::FromBytes)]
 struct EntityUniforms {
-    model: cgmath::Matrix4<f32>,
+    model: [[f32; 4]; 4],
     color: [f32; 4],
 }
 
@@ -700,7 +702,7 @@ impl framework::Example for Example {
                     entity.mx_world = entity.mx_world * rotation;
                 }
                 temp_buf_data.data[i] = EntityUniforms {
-                    model: entity.mx_world.clone(),
+                    model: entity.mx_world.into(),
                     color: [
                         entity.color.r as f32,
                         entity.color.g as f32,

examples/skybox/main.rs

@@ -72,11 +72,14 @@ impl framework::Example for Skybox {
         let aspect = sc_desc.width as f32 / sc_desc.height as f32;
         let uniforms = Self::generate_uniforms(aspect);
         let uniform_buf = device
-            .create_buffer_mapped(
+            .create_buffer_mapped::<[[f32; 4]; 4]>(
                 uniforms.len(),
                 wgpu::BufferUsage::UNIFORM | wgpu::BufferUsage::COPY_DST,
             )
-            .fill_from_slice(&uniforms);
+            .fill_from_slice(&[
+                uniforms[0].into(),
+                uniforms[1].into(),
+            ]);
         let uniform_buf_size = std::mem::size_of::<Uniforms>();
 
         let pipeline_layout = device.create_pipeline_layout(&wgpu::PipelineLayoutDescriptor {
@@ -276,8 +279,14 @@ impl framework::Example for Skybox {
         self.uniforms[1] = self.uniforms[1] * rotation;
         let uniform_buf_size = std::mem::size_of::<Uniforms>();
         let temp_buf = device
-            .create_buffer_mapped(2, wgpu::BufferUsage::COPY_SRC)
-            .fill_from_slice(&self.uniforms);
+            .create_buffer_mapped::<[[f32; 4]; 4]>(
+                self.uniforms.len(),
+                wgpu::BufferUsage::COPY_SRC,
+            )
+            .fill_from_slice(&[
+                self.uniforms[0].into(),
+                self.uniforms[1].into(),
+            ]);
 
         init_encoder.copy_buffer_to_buffer(
             &temp_buf,