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package makamys.neodymium.renderer.attribs;
import org.lwjgl.opengl.GL20;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
public class AttributeSet {
private final List<VertexAttribute> attributes = new ArrayList<>();
public void addAttribute(String name, int size, int elementSize, int type) {
int index = attributes.size();
attributes.add(new VertexAttribute(name, index, size, elementSize, type));
}
public void enable() {
int stride = attributes.stream().mapToInt(attrib -> attrib.size * attrib.elementSize).sum();
int offset = 0;
for (int i = 0, size = attributes.size(); i < size; i++) {
VertexAttribute attribute = attributes.get(i);
GL20.glVertexAttribPointer(i, attribute.size, attribute.type, false, stride, offset);
offset += attribute.size * attribute.elementSize;
GL20.glEnableVertexAttribArray(i);
}
}
public void addDefines(Map<String, String> defines) {
for (VertexAttribute attribute: attributes) {
defines.put("ATTRIB_" + attribute.name, Integer.toString(attribute.index));
}
}
public static class VertexAttribute {
public final String name;
public final int index;
public final int size;
public final int elementSize;
public final int type;
private VertexAttribute(String name, int index, int size, int elementSize, int type) {
this.name = name;
this.index = index;
this.size = size;
this.elementSize = elementSize;
this.type = type;
}
}
}
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