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feat(render): double-single corners for the image pipeline

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Raster-image quad corners derive from a large f64 insertion point plus
small u/v spans; the single-f32 cast quantized them at UTM scale. The
ImageModel now keeps a corners_low residual, ImageVertex carries pos_low
(location 2), and image.wgsl reconstructs the eye-relative position from
the high/low pair.

Co-Authored-By: Claude Opus 4.7 <[email protected]>
This commit is contained in:
Hakan SevenandClaude Opus 4.7 committed 2026-06-23 18:28:52 +03:00
1 parent 0f7920dc2c
commit bd12cc2f5a
3 files changed
+50 -42
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src/shaders/image.wgsl
+5 -3
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@@ -40,8 +40,9 @@ const DRAW_ORDER_BIAS: f32 = 0.001;
// ── Vertex stage ──────────────────────────────────────────────────────────────
struct VertIn {
@location(0) pos: vec3<f32>,
@location(1) uv: vec2<f32>,
@location(0) pos: vec3<f32>,
@location(1) uv: vec2<f32>,
@location(2) pos_low: vec3<f32>,
};
struct VertOut {
@@ -52,7 +53,8 @@ struct VertOut {
@vertex
fn vs_main(in: VertIn) -> VertOut {
var out: VertOut;
out.clip_pos = u.view_rot * vec4<f32>((in.pos - u.eye_high) - u.eye_low, 1.0);
let rel = (in.pos - u.eye_high) + (in.pos_low - u.eye_low);
out.clip_pos = u.view_rot * vec4<f32>(rel, 1.0);
out.clip_pos.z = out.clip_pos.z - img_params.draw_depth * DRAW_ORDER_BIAS * out.clip_pos.w;
out.uv = in.uv;
return out;