bind method

@override void bind(RenderPass pass, HostBuffer transientsBuffer, Lighting lighting)

Binds this material's render-pass state, uniforms, and textures.

The base implementation enables back-face culling with counter-clockwise winding (matching the glTF convention). Subclasses must call super.bind and then bind any per-material uniforms and textures expected by their fragment shader. lighting carries the IBL EnvironmentMap (and its intensity) plus the analytic lights and shadow resources that materials shade against.

Implementation

@override
void bind(
  gpu.RenderPass pass,
  gpu.HostBuffer transientsBuffer,
  Lighting lighting,
) {
  pass.setCullMode(cullingMode);
  pass.setWindingOrder(windingOrder);

  for (final entry in _uniformBlocks.entries) {
    pass.bindUniform(
      fragmentShader.getUniformSlot(entry.key),
      transientsBuffer.emplace(entry.value),
    );
  }

  for (final entry in _textures.entries) {
    // An empty render texture (no completed frame yet) binds the white
    // placeholder so the sampler slot is never left dangling.
    final resolved = resolveTextureSource(entry.value.source);
    pass.bindTexture(
      fragmentShader.getUniformSlot(entry.key),
      Material.whitePlaceholder(resolved),
      sampler:
          entry.value.sampler ??
          textureSourceSampler(entry.value.source) ??
          gpu.SamplerOptions(),
    );
  }

  if (useEnvironment) {
    _bindEnvironmentTextures(pass, lighting);
  }
}