Refactor: extract setup_standard_textures helper

Eliminates repetitive Renderer3D texture initialization across 3 test files.
Creates setup_standard_textures() helper that configures standard noise
(256x256, GPU procedural) and sky (512x256, Perlin) textures.

- New: src/3d/renderer_helpers.{h,cc}
- Refactor: test_3d_physics, test_3d_render, test_mesh use helper
- Build: Added renderer_helpers.cc to CMake 3D_SOURCES
- Result: -52 lines of boilerplate across 3 files

Production effects (Hybrid3DEffect, FlashCubeEffect) use asset-based
textures and retain custom initialization.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

1 files changed, 2 insertions, 19 deletions

diff --git a/src/tests/3d/test_3d_physics.cc b/src/tests/3d/test_3d_physics.cc
index 736cfc0..9b8bf11 100644
--- a/src/tests/3d/test_3d_physics.cc
+++ b/src/tests/3d/test_3d_physics.cc
@@ -6,6 +6,7 @@
 #include "3d/object.h"
 #include "3d/physics.h"
 #include "3d/renderer.h"
+#include "3d/renderer_helpers.h"
 #include "3d/scene.h"
 #include "gpu/effects/shaders.h"
 #include "gpu/texture_manager.h"
@@ -125,25 +126,7 @@ int main(int argc, char** argv) {
   g_renderer.init(g_device, g_queue, g_format);
   g_renderer.resize(platform_state.width, platform_state.height);
 
-  g_textures.init(g_device, g_queue);
-  ProceduralTextureDef noise_def;
-  noise_def.width = 256;
-  noise_def.height = 256;
-  noise_def.gen_func = gen_periodic_noise;
-  noise_def.params.push_back(1234.0f);
-  noise_def.params.push_back(16.0f);
-  g_textures.create_procedural_texture("noise", noise_def);
-
-  g_renderer.set_noise_texture(g_textures.get_texture_view("noise"));
-
-  ProceduralTextureDef sky_def;
-  sky_def.width = 512;
-  sky_def.height = 256;
-  sky_def.gen_func = procedural::gen_perlin;
-  sky_def.params = {42.0f, 4.0f, 1.0f, 0.5f, 6.0f};
-  g_textures.create_procedural_texture("sky", sky_def);
-
-  g_renderer.set_sky_texture(g_textures.get_texture_view("sky"));
+  setup_standard_textures(g_renderer, g_textures, g_device, g_queue);
 
   setup_scene();