From 7f57832c8b64ad560409523dfd69a324245a7761 Mon Sep 17 00:00:00 2001
From: skal <pascal.massimino@gmail.com>
Date: Mon, 2 Feb 2026 14:20:29 +0100
Subject: test(3d): Add procedural grid to floor and enable texturing

- Modified 'test_3d_render' to generate and use a procedural 'grid' texture for the floor.
- Updated fragment shader to sample the texture for rasterized objects, adding a grid pattern to the floor.
- This provides visual detail and contrast, making raymarched shadows much easier to observe and verify.
---
 src/3d/renderer.cc | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/3d')

diff --git a/src/3d/renderer.cc b/src/3d/renderer.cc
index 6de7fee..14c05f7 100644
--- a/src/3d/renderer.cc
+++ b/src/3d/renderer.cc
@@ -151,6 +151,7 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
 
     var p: vec3<f32>;
     var normal: vec3<f32>;
+    var base_color = in.color.rgb;
     let light_dir = normalize(vec3<f32>(0.2, 1.0, 0.2)); // More vertical light for easier shadow debugging
 
     if (obj_type == 0.0) { // Rasterized object
@@ -160,6 +161,11 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
         // Correct normal transformation using inverse transpose
         let mat3_it = mat3x3<f32>(obj.model_inv_tr[0].xyz, obj.model_inv_tr[1].xyz, obj.model_inv_tr[2].xyz);
         normal = normalize(mat3_it * local_normal);
+
+        // Apply grid texture for color to floor
+        let uv = p.xz * 0.1;
+        let grid_val = textureSample(noise_tex, noise_sampler, uv).r;
+        base_color = base_color * (0.3 + 0.7 * grid_val);
     } else { // SDF object
         let center = vec3<f32>(obj.model[3].x, obj.model[3].y, obj.model[3].z);
         let scale = length(vec3<f32>(obj.model[0].x, obj.model[0].y, obj.model[0].z));
@@ -224,8 +230,9 @@ fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
 
     let shadow = calc_shadow(p + normal * 0.01, light_dir, 0.0, 20.0);
     let lighting = (max(dot(normal, light_dir), 0.0) * shadow) + 0.1;
-    return vec4<f32>(in.color.rgb * lighting, 1.0);
+    return vec4<f32>(base_color * lighting, 1.0);
 }
+
 )";
 
 void Renderer3D::init(WGPUDevice device, WGPUQueue queue,
-- 
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