Switch shader texture usage from sampler2D to texture2D plus sampler (fixes #1)

.vscode/launch.json

@@ -7,7 +7,7 @@
 		{
 			"type": "lldb",
 			"request": "launch",
-			"name": "Debug executable 'graphite'",
+			"name": "Graphite debug executable",
 			"cargo": {
 				"args": [
 					"build",
@@ -20,7 +20,10 @@
 				}
 			},
 			"args": [],
-			"cwd": "${workspaceFolder}"
+			"cwd": "${workspaceFolder}",
+			"env": {
+				"RUST_LOG": "error"
+			}
 		},
 		{
 			"type": "lldb",

Cargo.lock

@@ -80,6 +80,17 @@ version = "0.3.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3c86699c3f02778ec07158376991c8f783dd1f2f95c579ffaf0738dc984b2fe2"
 
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi 0.3.8",
+]
+
 [[package]]
 name = "autocfg"
 version = "0.1.7"
@@ -436,6 +447,19 @@ version = "1.5.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bb1f6b1ce1c140482ea30ddd3335fc0024ac7ee112895426e0a629a6c20adfe3"
 
+[[package]]
+name = "env_logger"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "44533bbbb3bb3c1fa17d9f2e4e38bbbaf8396ba82193c4cb1b6445d711445d36"
+dependencies = [
+ "atty",
+ "humantime",
+ "log",
+ "regex",
+ "termcolor",
+]
+
 [[package]]
 name = "failure"
 version = "0.1.8"
@@ -799,6 +823,7 @@ dependencies = [
  "bytemuck",
  "cgmath",
  "css-color-parser",
+ "env_logger",
  "failure",
  "futures",
  "glsl-to-spirv",
@@ -829,6 +854,15 @@ dependencies = [
  "atom",
 ]
 
+[[package]]
+name = "humantime"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "df004cfca50ef23c36850aaaa59ad52cc70d0e90243c3c7737a4dd32dc7a3c4f"
+dependencies = [
+ "quick-error",
+]
+
 [[package]]
 name = "image"
 version = "0.22.5"
@@ -1384,6 +1418,12 @@ dependencies = [
  "unicode-xid 0.2.0",
 ]
 
+[[package]]
+name = "quick-error"
+version = "1.2.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
+
 [[package]]
 name = "quote"
 version = "0.6.13"
@@ -1816,6 +1856,15 @@ dependencies = [
  "winapi 0.3.8",
 ]
 
+[[package]]
+name = "termcolor"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bb6bfa289a4d7c5766392812c0a1f4c1ba45afa1ad47803c11e1f407d846d75f"
+dependencies = [
+ "winapi-util",
+]
+
 [[package]]
 name = "thread_local"
 version = "1.0.1"

Cargo.toml

@@ -19,4 +19,8 @@ bytemuck = "1.2.0"
 rctree = "0.3.3"
 xmlparser = "0.13.1"
 regex = "1.3.7"
-css-color-parser = "0.1.2"
+css-color-parser = "0.1.2"
+env_logger = { version = "0.7.1", optional = true }
+
+[features]
+debug = ["env_logger"]

shaders/shader.frag

@@ -16,8 +16,10 @@ layout(set=0, binding=0) uniform GuiNodeUniform {
 	vec4 border_color;
 	vec4 fill_color;
 };
-layout(set=0, binding=1) uniform sampler2D t_texture;
+
+layout(set=0, binding=1) uniform texture2D t_texture;
+layout(set=0, binding=2) uniform sampler s_texture;
 
 void main() {
-	f_color = fill_color * texture(t_texture, v_uv / textureSize(t_texture, 0) * 100);
+	f_color = fill_color * texture(sampler2D(t_texture, s_texture), v_uv / textureSize(sampler2D(t_texture, s_texture), 0) * 500);
 }

shaders/shader.vert

@@ -5,6 +5,6 @@ layout(location=0) in vec2 a_position;
 layout(location=0) out vec2 v_uv;
 
 void main() {
-	v_uv = a_position;
+	v_uv = (a_position + 1) / 2;
 	gl_Position = vec4(a_position, 0.0, 1.0);
 }

src/gui_node.rs

@@ -60,6 +60,7 @@ impl GuiNode {
 		let bind_group = Pipeline::build_bind_group(device, &pipeline.bind_group_layout, vec![
 			Pipeline::build_binding_resource(&binding_staging_buffer),
 			wgpu::BindingResource::TextureView(&texture.texture_view),
+			wgpu::BindingResource::Sampler(&texture.sampler),
 		]);
 		
 		vec![

src/main.rs

@@ -20,6 +20,10 @@ use winit::event_loop::EventLoop;
 use winit::window::WindowBuilder;
 
 fn main() {
+	// Display graphics API errors (requires Vulkan SDK is installed)
+	#[cfg(feature = "debug")]
+	env_logger::init();
+
 	// Handles all window events, user input, and redraws
 	let event_loop = EventLoop::new();
 

src/pipeline.rs

@@ -20,6 +20,7 @@ impl Pipeline {
 				component_type: wgpu::TextureComponentType::Float,
 				multisampled: false,
 			},
+			wgpu::BindingType::Sampler { comparison: false },
 		]);
 		
 		// Combine all bind group layouts