Shader Programs: Two shaders are defined- a vertex shader and a fragment shader (FSHADER_SOURCE). The vertex shader processes each vertex's position and color, while the fragment shader determines the color of each pixel.

Shape Objects: Several 3D shape objects are created (Torus, Cube, Pyramid, Cylinder, Cone, Sphere, Tiles), each with its starting vertex and length.

makeVertices(): compiles all the vertices of the shapes into a single array, preparing them for rendering.

main(): Initialize shaders and locations for various attributes and uniform variables are retrieved. A buffer for the vertices is created, bound, and set with vertex attributes for position and color.

Rendering

draw() : Rendering the scene. It clears the canvas and sets up different viewport quadrants with unique view and projection matrices, then calls drawShapes() for each quadrant.

Shape Drawing: drawCube(), drawTorus(), and others, set up transformation matrices for each shape and draw them.

animate(): updates the coneAngle and continuously requests draw() function.

Interactive Controls: Event listeners are added for buttons to control the rotation speed of the cone.

Tile Drawing:

drawTiles(): Recursively draws tiles on the canvas, utilizing a depth-first approach.