From 05135beb87bbf0edace544b80ba40e327d9a89ac Mon Sep 17 00:00:00 2001
From: Kai Stevenson <kai@kaistevenson.com>
Date: Sat, 15 Aug 2026 20:44:10 -0700
Subject: factor code out of main, optimizations

---
 src/shader/shader.wgsl | 44 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 src/shader/shader.wgsl

(limited to 'src/shader')

diff --git a/src/shader/shader.wgsl b/src/shader/shader.wgsl
new file mode 100644
index 0000000..bd38cf0
--- /dev/null
+++ b/src/shader/shader.wgsl
@@ -0,0 +1,44 @@
+struct ChunkData {
+    origin: vec2<i32>,
+};
+
+var<immediate> chunk: ChunkData;
+
+struct Camera {
+    scale: vec2f,
+    centre: vec2f,
+};
+
+@group(0) @binding(0) var<uniform> camera: Camera;
+@group(1) @binding(0) var tex: texture_2d<f32>;
+
+struct VertexOutput {
+    @builtin(position) clip_position: vec4<f32>,
+    @location(0) uv: vec2<f32>,
+};
+
+@vertex
+fn vs_main(
+    @builtin(vertex_index) i: u32,
+) -> VertexOutput {
+    var out: VertexOutput;
+    // (0,0),(1,0),(0,1),(1,1)
+    let corner = vec2f(f32(i & 1u), f32(i >> 1u));
+
+    // CHUNK_SIZE
+    let world = (vec2f(chunk.origin) + corner) * 128.0;
+    let ndc = (world - camera.centre) * camera.scale;
+
+    out.clip_position = vec4f(ndc, 0.0, 1.0);
+    out.uv = corner;
+
+    return out;
+}
+
+@fragment
+fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
+    // CHUNK_SIZE
+    let dims = vec2f(128.0, 128.0);
+    return textureLoad(tex, vec2i(in.uv * dims), 0);
+    // return vec4f(0.0, 1.0, 0.0, 1.0);
+}
\ No newline at end of file
-- 
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