private void bindWebGL() {
// Adds the Surface3D to the document.
Surface3D surface = new Surface3D(500, 500);
RootPanel.get().add(surface);
final GL2 gl = surface.getGL();
if (gl == null) {
Window.alert("No WebGL context found. Exiting.");
return;
}
// Sets up the GL context.
gl.clearColor(0.0f, 0f, 0f, 1f);
gl.clearDepth(1);
gl.viewport(0, 0, surface.getWidth(), surface.getHeight());
gl.enable(EnableCap.DEPTH_TEST);
gl.depthFunc(DepthFunction.LEQUAL);
gl.clear(ClearBufferMask.COLOR_BUFFER_BIT, ClearBufferMask.DEPTH_BUFFER_BIT);
// Creates a lambertian shader.
LambertianShader shader = new LambertianShader();
try {
shader.init(gl);
} catch (ShaderException e) {
Window.alert("Error loading the shader.");
return;
}
// Binds the shader.
shader.bind();
// Creates a sphere.
StaticMesh mesh = new StaticMesh(gl, PrimitiveFactory.makeSphere(30, 30));
mesh.setPositionIndex(shader.getAttributePosition());
mesh.setNormalIndex(shader.getAttributeNormal());
shader.setLightPosition(0, 5, 5);
shader.setDiffuseColor(1, 0, 0, 1);
// Sets up the model view matrix.
MatrixStack.MODELVIEW.push();
MatrixStack.MODELVIEW.translate(0, 0, -5);
shader.setModelViewMatrix(MatrixStack.MODELVIEW.get());
MatrixStack.MODELVIEW.pop();
// Sets up a basic camera for projection.
MatrixStack.PROJECTION.pushIdentity();
MatrixStack.PROJECTION.perspective(45, 1, .1f, 100);
shader.setProjectionMatrix(MatrixStack.PROJECTION.get());
MatrixStack.PROJECTION.pop();
// Draws the mesh.
mesh.draw();
mesh.dispose();
shader.dispose();
}
