Class Shader

src/main/java/field/graphics/Shader.java:36–535

An OpenGL Shader written in GL Shader Language (GLSL) Much of the complexity of this class stems from the fact that an OpenGL program is linked from a variety of (sometimes optional, sometimes reusable) parts. This class supports all of them. The rest of the complexity comes from the fact that b

 * Assuming that all goes well shaders take three principle kinds of inputs: vertex attributes (make and set these with aux and v calls in MeshBuilders), uniforms (make and set these with
 * calls to Uniform and UniformBundle classes here) and input from earlier shaders.
 */
public class Shader extends BaseScene<Shader.State> implements Scene.Perform, fieldlinker.AsMap, HandlesCompletion, BoxBrowser.HasMarkdownInformation {

	private ShaderIntrospection introspection;
	private int modCount;

	@Override
	public String generateMarkdown(Box inside, Dict.Prop property) {
		if (introspection == null)
			return "Shader has not been executed by the graphics system, is it correctly attached to something?"+(lastAccumulatedError==null ? "" : "<br>Errors seen by the linker are:<br><pre style='font-size:75%'>"+lastAccumulatedError+"</pre>");

		return introspection.getMarkdown(inside);
	}

	static public class State extends BaseScene.Modifiable {
		int name;
		boolean work = true;
		boolean valid = false;
	}

	public enum Type {
		vertex(GL20.GL_VERTEX_SHADER), geometry(GL32.GL_GEOMETRY_SHADER), fragment(GL20.GL_FRAGMENT_SHADER), tessControl(GL40.GL_TESS_CONTROL_SHADER), tessEval(GL40.GL_TESS_EVALUATION_SHADER), compute(GL43.GL_COMPUTE_SHADER);

		public int gl;

		private Type(int gl) {
			this.gl = gl;
		}
	}

	public interface iErrorHandler {
		public void beginError();

		public void errorOnLine(int line, String error);

		public void endError();

		public void noError();
	}

	public int num_groups_x = 1;
	public int num_groups_y = 1;
	public int num_groups_z = 1;

	protected iErrorHandler onError = null;

	Map<Type, Source> source = new LinkedHashMap<>();

	static public class Source {
		public Supplier<String> source;
		protected final Type type;
		protected int status;
		public iErrorHandler onError = null;


		public Source(Supplier<String> source, Type type) {
			this.type = type;
			this.source = source;