first commit

src/shaders/viewcube_text.wgsl

@@ -0,0 +1,39 @@
+struct Uniforms {
+    screen: vec2<f32>,
+    _pad: vec2<f32>,
+};
+
+@group(0) @binding(0) var<uniform> u: Uniforms;
+@group(0) @binding(1) var samp: sampler;
+@group(0) @binding(2) var tex: texture_2d<f32>;
+
+struct VsIn {
+    @location(0) pos: vec2<f32>,
+    @location(1) uv: vec2<f32>,
+    @location(2) color: vec4<f32>,
+};
+
+struct VsOut {
+    @builtin(position) pos: vec4<f32>,
+    @location(0) uv: vec2<f32>,
+    @location(1) color: vec4<f32>,
+};
+
+@vertex
+fn vs_main(input: VsIn) -> VsOut {
+    var out: VsOut;
+    let ndc = vec2<f32>(
+        (input.pos.x / u.screen.x) * 2.0 - 1.0,
+        1.0 - (input.pos.y / u.screen.y) * 2.0
+    );
+    out.pos = vec4<f32>(ndc, 0.0, 1.0);
+    out.uv = input.uv;
+    out.color = input.color;
+    return out;
+}
+
+@fragment
+fn fs_main(input: VsOut) -> @location(0) vec4<f32> {
+    let a = textureSample(tex, samp, input.uv).r;
+    return vec4<f32>(input.color.rgb, input.color.a * a);
+}