Window with textured polygon

src/texture.rs

@@ -0,0 +1,78 @@
+use image::GenericImageView;
+
+pub struct Texture {
+	pub texture: wgpu::Texture,
+	pub view: wgpu::TextureView,
+	pub sampler: wgpu::Sampler,
+}
+
+impl Texture {
+	pub fn from_filepath(device: &wgpu::Device, queue: &mut wgpu::Queue, path: &str) -> Result<Self, failure::Error> {
+		let bytes = std::fs::read(path)?;
+		Texture::from_bytes(device, queue, &bytes[..])
+	}
+	
+	pub fn from_bytes(device: &wgpu::Device, queue: &mut wgpu::Queue, bytes: &[u8]) -> Result<Self, failure::Error> {
+		let img = image::load_from_memory(bytes)?;
+		Self::from_image(device, queue, &img)
+	}
+
+	pub fn from_image(device: &wgpu::Device, queue: &mut wgpu::Queue, img: &image::DynamicImage) -> Result<Self, failure::Error> {
+		let rgba = img.as_rgba8().unwrap();
+		let dimensions = img.dimensions();
+		let size = wgpu::Extent3d {
+			width: dimensions.0,
+			height: dimensions.1,
+			depth: 1,
+		};
+
+		let texture = device.create_texture(&wgpu::TextureDescriptor {
+			size,
+			array_layer_count: 1,
+			mip_level_count: 1,
+			sample_count: 1,
+			dimension: wgpu::TextureDimension::D2,
+			format: wgpu::TextureFormat::Rgba8UnormSrgb,
+			usage: wgpu::TextureUsage::SAMPLED | wgpu::TextureUsage::COPY_DST,
+		});
+
+		let buffer = device.create_buffer_mapped(rgba.len(), wgpu::BufferUsage::COPY_SRC).fill_from_slice(&rgba);
+
+		let mut encoder = device.create_command_encoder(&Default::default());
+
+		encoder.copy_buffer_to_texture(
+			wgpu::BufferCopyView {
+				buffer: &buffer,
+				offset: 0,
+				row_pitch: 4 * dimensions.0,
+				image_height: dimensions.1,
+			}, 
+			wgpu::TextureCopyView {
+				texture: &texture,
+				mip_level: 0,
+				array_layer: 0,
+				origin: wgpu::Origin3d::ZERO,
+			},
+			size,
+		);
+
+		let command_buffer = encoder.finish();
+
+		let view = texture.create_default_view();
+		let sampler = device.create_sampler(&wgpu::SamplerDescriptor {
+			address_mode_u: wgpu::AddressMode::ClampToEdge,
+			address_mode_v: wgpu::AddressMode::ClampToEdge,
+			address_mode_w: wgpu::AddressMode::ClampToEdge,
+			mag_filter: wgpu::FilterMode::Linear,
+			min_filter: wgpu::FilterMode::Nearest,
+			mipmap_filter: wgpu::FilterMode::Nearest,
+			lod_min_clamp: -100.0,
+			lod_max_clamp: 100.0,
+			compare_function: wgpu::CompareFunction::Always,
+		});
+
+		queue.submit(&[command_buffer]);
+		
+		Ok(Self { texture, view, sampler })
+	}
+}