rotating_cube: use VSOut, and store to yiq

1 files changed, 8 insertions, 3 deletions

diff --git a/src/effects/rotating_cube.wgsl b/src/effects/rotating_cube.wgsl
index 0c75a13..abd584c 100644
--- a/src/effects/rotating_cube.wgsl
+++ b/src/effects/rotating_cube.wgsl
@@ -1,4 +1,8 @@
 // Rotating cube shader v2 (simplified, no masking)
+// output to YIQ color space
+
+#include "math/color"
+#include "math/color_c64"
 
 struct Uniforms {
     view_proj: mat4x4f,
@@ -76,8 +80,9 @@ fn get_cube_normal(vid: u32) -> vec3f {
     return VSOut(clip_pos, world_pos.xyz, world_normal);
 }
 
-@fragment fn fs_main(@location(0) world_pos: vec3f, @location(1) normal: vec3f) -> @location(0) vec4f {
-    let N = normalize(normal);
+@fragment fn fs_main(in: VSOut) -> @location(0) vec4f {
+    let screen_uv = in.pos.xy / uniforms.resolution;
+    let N = in.normal;  // not re-normalized: cube faces are flat, no drift
     let light_dir = normalize(vec3f(1.0, 1.0, 1.0));
     let diffuse = max(dot(N, light_dir), 0.0);
 
@@ -85,5 +90,5 @@ fn get_cube_normal(vid: u32) -> vec3f {
     let lighting = ambient + diffuse * 0.7;
 
     let color = object.color.rgb * lighting;
-    return vec4f(color, 1.0);
+    return rgba_to_luma_chroma_phase(vec4f(color, 1.0), screen_uv.y, 264.);
 }