Java tutorial
/* * Copyright 2013 MovingBlocks * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.terasology.rendering; import org.lwjgl.opengl.GL11; import org.terasology.registry.CoreRegistry; import org.terasology.math.AABB; import org.terasology.rendering.world.WorldRenderer; import javax.vecmath.Vector3f; import javax.vecmath.Vector4f; import static org.lwjgl.opengl.GL11.GL_BLEND; import static org.lwjgl.opengl.GL11.GL_LINE_LOOP; import static org.lwjgl.opengl.GL11.GL_QUADS; import static org.lwjgl.opengl.GL11.glBegin; import static org.lwjgl.opengl.GL11.glCallList; import static org.lwjgl.opengl.GL11.glColor4f; import static org.lwjgl.opengl.GL11.glDeleteLists; import static org.lwjgl.opengl.GL11.glDisable; import static org.lwjgl.opengl.GL11.glEnable; import static org.lwjgl.opengl.GL11.glEnd; import static org.lwjgl.opengl.GL11.glEndList; import static org.lwjgl.opengl.GL11.glGenLists; import static org.lwjgl.opengl.GL11.glLineWidth; import static org.lwjgl.opengl.GL11.glNewList; import static org.lwjgl.opengl.GL11.glPopMatrix; import static org.lwjgl.opengl.GL11.glPushMatrix; import static org.lwjgl.opengl.GL11.glScalef; import static org.lwjgl.opengl.GL11.glTranslated; import static org.lwjgl.opengl.GL11.glVertex3f; /** * Renderer for an AABB. * * @author Immortius */ public class AABBRenderer implements BlockOverlayRenderer { private int displayListWire = -1; private int displayListSolid = -1; private Vector4f solidColor = new Vector4f(1f, 1f, 1f, 1f); private AABB aabb; public AABBRenderer(AABB aabb) { this.aabb = aabb; } public void setAABB(AABB from) { if (from != null && !from.equals(this.aabb)) { this.aabb = from; dispose(); } } public void dispose() { if (displayListWire != -1) { glDeleteLists(displayListWire, 1); displayListWire = -1; } if (displayListSolid != -1) { glDeleteLists(displayListSolid, 1); displayListSolid = -1; } } public void setSolidColor(Vector4f color) { solidColor = color; } /** * Renders this AABB. * <p/> * * @param lineThickness The thickness of the line */ public void render(float lineThickness) { CoreRegistry.get(ShaderManager.class).enableDefault(); glPushMatrix(); Vector3f cameraPosition = CoreRegistry.get(WorldRenderer.class).getActiveCamera().getPosition(); glTranslated(aabb.getCenter().x - cameraPosition.x, -cameraPosition.y, aabb.getCenter().z - cameraPosition.z); renderLocally(lineThickness); glPopMatrix(); } public void renderSolid() { CoreRegistry.get(ShaderManager.class).enableDefault(); glPushMatrix(); Vector3f cameraPosition = CoreRegistry.get(WorldRenderer.class).getActiveCamera().getPosition(); glTranslated(aabb.getCenter().x - cameraPosition.x, -cameraPosition.y, aabb.getCenter().z - cameraPosition.z); renderSolidLocally(); glPopMatrix(); } public void renderLocally(float lineThickness) { CoreRegistry.get(ShaderManager.class).enableDefault(); if (displayListWire == -1) { generateDisplayListWire(); } glPushMatrix(); glTranslated(0f, aabb.getCenter().y, 0f); glLineWidth(lineThickness); glCallList(displayListWire); glPopMatrix(); } public void renderSolidLocally() { CoreRegistry.get(ShaderManager.class).enableDefault(); if (displayListSolid == -1) { generateDisplayListSolid(); } glEnable(GL_BLEND); glPushMatrix(); glTranslated(0f, aabb.getCenter().y, 0f); glScalef(1.5f, 1.5f, 1.5f); glCallList(displayListSolid); glPopMatrix(); glDisable(GL_BLEND); } private void generateDisplayListSolid() { displayListSolid = glGenLists(1); glNewList(displayListSolid, GL11.GL_COMPILE); glBegin(GL_QUADS); glColor4f(solidColor.x, solidColor.y, solidColor.z, solidColor.w); Vector3f dimensions = aabb.getExtents(); GL11.glVertex3f(-dimensions.x, dimensions.y, dimensions.z); GL11.glVertex3f(dimensions.x, dimensions.y, dimensions.z); GL11.glVertex3f(dimensions.x, dimensions.y, -dimensions.z); GL11.glVertex3f(-dimensions.x, dimensions.y, -dimensions.z); GL11.glVertex3f(-dimensions.x, -dimensions.y, -dimensions.z); GL11.glVertex3f(-dimensions.x, -dimensions.y, dimensions.z); GL11.glVertex3f(-dimensions.x, dimensions.y, dimensions.z); GL11.glVertex3f(-dimensions.x, dimensions.y, -dimensions.z); GL11.glVertex3f(-dimensions.x, -dimensions.y, dimensions.z); GL11.glVertex3f(dimensions.x, -dimensions.y, dimensions.z); GL11.glVertex3f(dimensions.x, dimensions.y, dimensions.z); GL11.glVertex3f(-dimensions.x, dimensions.y, dimensions.z); GL11.glVertex3f(dimensions.x, dimensions.y, -dimensions.z); GL11.glVertex3f(dimensions.x, dimensions.y, dimensions.z); GL11.glVertex3f(dimensions.x, -dimensions.y, dimensions.z); GL11.glVertex3f(dimensions.x, -dimensions.y, -dimensions.z); GL11.glVertex3f(-dimensions.x, dimensions.y, -dimensions.z); GL11.glVertex3f(dimensions.x, dimensions.y, -dimensions.z); GL11.glVertex3f(dimensions.x, -dimensions.y, -dimensions.z); GL11.glVertex3f(-dimensions.x, -dimensions.y, -dimensions.z); GL11.glVertex3f(-dimensions.x, -dimensions.y, -dimensions.z); GL11.glVertex3f(dimensions.x, -dimensions.y, -dimensions.z); GL11.glVertex3f(dimensions.x, -dimensions.y, dimensions.z); GL11.glVertex3f(-dimensions.x, -dimensions.y, dimensions.z); glEnd(); glEndList(); } private void generateDisplayListWire() { float offset = 0.001f; displayListWire = glGenLists(1); glNewList(displayListWire, GL11.GL_COMPILE); glColor4f(0.0f, 0.0f, 0.0f, 1.0f); Vector3f dimensions = aabb.getExtents(); // FRONT glBegin(GL_LINE_LOOP); glVertex3f(-dimensions.x - offset, -dimensions.y - offset, -dimensions.z - offset); glVertex3f(+dimensions.x + offset, -dimensions.y - offset, -dimensions.z - offset); glVertex3f(+dimensions.x + offset, +dimensions.y + offset, -dimensions.z - offset); glVertex3f(-dimensions.x - offset, +dimensions.y + offset, -dimensions.z - offset); glEnd(); // BACK glBegin(GL_LINE_LOOP); glVertex3f(-dimensions.x - offset, -dimensions.y - offset, +dimensions.z + offset); glVertex3f(+dimensions.x + offset, -dimensions.y - offset, +dimensions.z + offset); glVertex3f(+dimensions.x + offset, +dimensions.y + offset, +dimensions.z + offset); glVertex3f(-dimensions.x - offset, +dimensions.y + offset, +dimensions.z + offset); glEnd(); // TOP glBegin(GL_LINE_LOOP); glVertex3f(-dimensions.x - offset, -dimensions.y - offset, -dimensions.z - offset); glVertex3f(+dimensions.x + offset, -dimensions.y - offset, -dimensions.z - offset); glVertex3f(+dimensions.x + offset, -dimensions.y - offset, +dimensions.z + offset); glVertex3f(-dimensions.x - offset, -dimensions.y - offset, +dimensions.z + offset); glEnd(); // BOTTOM glBegin(GL_LINE_LOOP); glVertex3f(-dimensions.x - offset, +dimensions.y + offset, -dimensions.z - offset); glVertex3f(+dimensions.x + offset, +dimensions.y + offset, -dimensions.z - offset); glVertex3f(+dimensions.x + offset, +dimensions.y + offset, +dimensions.z + offset); glVertex3f(-dimensions.x - offset, +dimensions.y + offset, +dimensions.z + offset); glEnd(); // LEFT glBegin(GL_LINE_LOOP); glVertex3f(-dimensions.x - offset, -dimensions.y - offset, -dimensions.z - offset); glVertex3f(-dimensions.x - offset, -dimensions.y - offset, +dimensions.z + offset); glVertex3f(-dimensions.x - offset, +dimensions.y + offset, +dimensions.z + offset); glVertex3f(-dimensions.x - offset, +dimensions.y + offset, -dimensions.z - offset); glEnd(); // RIGHT glBegin(GL_LINE_LOOP); glVertex3f(+dimensions.x + offset, -dimensions.y - offset, -dimensions.z - offset); glVertex3f(+dimensions.x + offset, -dimensions.y - offset, +dimensions.z + offset); glVertex3f(+dimensions.x + offset, +dimensions.y + offset, +dimensions.z + offset); glVertex3f(+dimensions.x + offset, +dimensions.y + offset, -dimensions.z - offset); glEnd(); glEndList(); } public AABB getAABB() { return aabb; } }