Model

• Constructor accepts vs, fs, modules, attributes, bufferLayout and topology.
• draw(renderPass) returns false when resources or bindings are incomplete.
• setVertexCount, setInstanceCount and setBindings update state between draws.

const positions = device.createBuffer(new Float32Array([
  -0.6, -0.45, 0,
   0.6, -0.45, 0,
   0.0,  0.55, 0
]));

const colors = device.createBuffer(new Float32Array([
  0.95, 0.36, 0.32,
  0.98, 0.78, 0.35,
  0.35, 0.80, 0.95
]));

const model = new Model(device, {
  topology: 'triangle-list',
  vertexCount: 3,
  attributes: {
    positions: positions,
    colors: colors
  },
  bufferLayout: [
    { name: 'positions', stepMode: 'vertex', format: 'float32x3' },
    { name: 'colors', stepMode: 'vertex', format: 'float32x3' }
  ],
  vs: '#version 300 es\n...',
  fs: '#version 300 es\n...'
});

const pass = device.beginRenderPass({ clearColor: [0.04, 0.06, 0.09, 1] });

model.setVertexCount(count);
model.draw(pass);

pass.end();

• There is no setUniforms in v9; per-frame values belong in uniform buffers.
• A bufferLayout that disagrees with the shader layout silently drops attributes.