feat(scene1): replace ad-hoc camera with CameraParams uniform

Build camera via mat4::look_at + inverse in scene1_effect.cc, upload as
CameraParams at binding 3. Shader uses getCameraRay() from camera_common.
Enable camera_common snippet registration in shaders.cc.

handoff(Claude): Scene1 camera now driven by CameraParams uniform; fov=TAU/6 (60° vFOV) matches original tan(PI/3) parameterization.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 4 insertions, 12 deletions

diff --git a/workspaces/main/shaders/scene1.wgsl b/workspaces/main/shaders/scene1.wgsl
index 2f1174a..ff21318 100644
--- a/workspaces/main/shaders/scene1.wgsl
+++ b/workspaces/main/shaders/scene1.wgsl
@@ -2,12 +2,14 @@
 // Source: Saturday cubism experiment by skal
 
 #include "sequence_uniforms"
+#include "camera_common"
 #include "math/color"
 #include "math/utils"
 #include "math/sdf_shapes"
 #include "render/raymarching"
 
 @group(0) @binding(2) var<uniform> uniforms: UniformsSequenceParams;
+@group(0) @binding(3) var<uniform> camera: CameraParams;
 
 const PI: f32 = 3.141592654;
 const TAU: f32 = 6.283185307;
@@ -178,18 +180,8 @@ fn render1(ro: vec3<f32>, rd: vec3<f32>) -> vec3<f32> {
 
 fn effect(p: vec2<f32>) -> vec3<f32> {
   g_rot0 = rot(-0.2 * uniforms.time);
-
-  let fov = tan(TAU / 6.0);
-  let ro = vec3<f32>(0.0, 2.5, 5.0);
-  let la = vec3<f32>(0.0, 0.0, 0.0);
-  let up = vec3<f32>(0.1, 1.0, 0.0);
-
-  let ww = normalize(la - ro);
-  let uu = normalize(cross(up, ww));
-  let vv = cross(ww, uu);
-  let rd = normalize(-p.x * uu + p.y * vv + fov * ww);
-
-  return render1(ro, rd);
+  let ray = getCameraRay(camera, p);
+  return render1(ray.origin, ray.direction);
 }
 
 #include "render/fullscreen_vs"