Merge pull request #81 from hecrj/fix/triangles-validation-error

Fix validation error on `wgpu` triangle pipeline

CHANGELOG.md

@@ -26,10 +26,12 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Fixed
 - Incorrect buffer sizes in the `Mesh` pipeline. This caused vertices to entirely
   disappear when rendering big meshes, leading to a potential crash.
+- Validation error when rendering meshes using Vulkan, Metal, D3D11, or D3D12. [#81]
 
 [#66]: https://github.com/hecrj/coffee/pull/66
 [#77]: https://github.com/hecrj/coffee/pull/77
 [#78]: https://github.com/hecrj/coffee/pull/78
+[#81]: https://github.com/hecrj/coffee/pull/81
 
 
 ## [0.3.1] - 2019-06-20

Cargo.toml

@@ -50,5 +50,4 @@ wgpu = { version = "0.2", optional = true, git = "https://github.com/gfx-rs/wgpu
 wgpu_glyph = { version = "0.3", optional = true, git = "https://github.com/hecrj/wgpu_glyph", rev = "0577e4d2be6b035a14aa0c5d82b143aaf26c1bd3" }
 
 [dev-dependencies]
-# Example dependencies
 rand = "0.6"

src/graphics/backend_wgpu/triangle.rs

@@ -112,12 +112,12 @@ impl Pipeline {
         let vertices = device.create_buffer(&wgpu::BufferDescriptor {
             size: mem::size_of::<Vertex>() as u64
                 * Self::INITIAL_BUFFER_SIZE as u64,
-            usage: wgpu::BufferUsage::VERTEX,
+            usage: wgpu::BufferUsage::VERTEX | wgpu::BufferUsage::TRANSFER_DST,
         });
 
         let indices = device.create_buffer(&wgpu::BufferDescriptor {
             size: Self::INITIAL_BUFFER_SIZE as u64 * 2,
-            usage: wgpu::BufferUsage::INDEX,
+            usage: wgpu::BufferUsage::INDEX | wgpu::BufferUsage::TRANSFER_DST,
         });
 
         Pipeline {
@@ -164,12 +164,14 @@ impl Pipeline {
 
             self.vertices = device.create_buffer(&wgpu::BufferDescriptor {
                 size: mem::size_of::<Vertex>() as u64 * new_size as u64,
-                usage: wgpu::BufferUsage::VERTEX,
+                usage: wgpu::BufferUsage::VERTEX
+                    | wgpu::BufferUsage::TRANSFER_DST,
             });
 
             self.indices = device.create_buffer(&wgpu::BufferDescriptor {
                 size: new_size as u64 * 2,
-                usage: wgpu::BufferUsage::INDEX,
+                usage: wgpu::BufferUsage::INDEX
+                    | wgpu::BufferUsage::TRANSFER_DST,
             });
 
             self.buffer_size = new_size;