switched to stack and compute shaders

src/client/render/voxel/ray_oct/render.wgsl

@@ -0,0 +1,47 @@
+// Vertex shader
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+};
+
+struct View {
+    transform: mat4x4<f32>,
+    width: u32,
+    height: u32,
+    zoom: f32,
+};
+
+@group(0) @binding(0)
+var<uniform> view: View;
+@group(0) @binding(1)
+var t_diffuse: texture_2d<f32>;
+@group(0) @binding(2)
+var s_diffuse: sampler;
+
+@vertex
+fn vs_main(
+    @builtin(vertex_index) vi: u32,
+    @builtin(instance_index) ii: u32,
+) -> VertexOutput {
+    var out: VertexOutput;
+
+    var pos = vec2<f32>(
+        f32(vi % 2u) * 2.0 - 1.0,
+        f32(vi / 2u) * 2.0 - 1.0,
+    );
+    out.clip_position = vec4<f32>(pos.x, pos.y, 0.0, 1.0);
+    return out;
+}
+
+// Fragment shader
+
+@fragment
+fn fs_main(
+    in: VertexOutput,
+) -> @location(0) vec4<f32> {
+    let win_dim = vec2<f32>(f32(view.width), f32(view.height));
+    var pos = in.clip_position.xy / win_dim;
+    pos.y = 1.0 - pos.y;
+    return textureSample(t_diffuse, s_diffuse, pos);
+}
+