Set the texture to filterable

wgpu doesn't yet validate this but Chrome does and complains with:

Texture binding (group:0, binding:2) is TextureSampleType::UnfilterableFloat but used statically with a sampler (group:0, binding:1) that's SamplerBindingType::Filtering
- While validating fragment stage (module: [ShaderModule "Glyph Shader"], entryPoint: fs_main).
- While validating fragment state.
- While calling [Device].CreateRenderPipeline([RenderPipelineDescriptor]).

Author: Bobo1239

src/pipeline.rs

@@ -247,7 +247,7 @@ fn build<D>(
                     visibility: wgpu::ShaderStages::FRAGMENT,
                     ty: wgpu::BindingType::Texture {
                         sample_type: wgpu::TextureSampleType::Float {
-                            filterable: false,
+                            filterable: true,
                         },
                         view_dimension: wgpu::TextureViewDimension::D2,
                         multisampled: false,