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Hello Cube

Goal: expand the triangle model with geometry, a sampled texture, depth testing, and uniforms that change every frame.

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From a draw to a scene object​

CubeGeometry supplies positions, texture coordinates, and indices. Model converts that geometry into GPU buffers and associates the attributes with the locations declared by the WGSL and GLSL vertex shaders.

A DynamicTexture begins loading the image immediately. The model binds it by name, so the WebGPU shader's @binding(auto) declarations and the WebGL2 sampler uniform can use the same JavaScript binding object.

Updating uniforms​

The model-view-projection matrix changes every frame as the cube rotates. UniformStore maintains the typed CPU values and the corresponding managed GPU uniform buffer. The frame performs three steps:

  1. Recalculate the matrix for the current aspect ratio and animation tick.
  2. Call setUniforms with the new value.
  3. Draw the model in a pass with color and depth attachments.

Depth writes and less-equal comparison ensure the cube's hidden faces do not overwrite nearer surfaces.

Runnable sourceView on GitHub
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Common problems​

  • A black cube usually indicates that the image failed to load; check the asset URL.
  • Distorted faces usually indicate an attribute layout that does not match the shader.
  • Missing faces or incorrect overlap often means depth testing or the depth attachment is absent.

Summary​

You combined geometry, asynchronous texture data, bindings, uniforms, and depth state in one reusable model. Next, Hello Instancing draws many objects with one model and one draw call.