/*
* Copyright (c) 2013, Oskar Veerhoek
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those
* of the authors and should not be interpreted as representing official policies,
* either expressed or implied, of the FreeBSD Project.
*/
package future;
import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import utility.BufferTools;
import utility.LWJGLTimer;
import java.nio.FloatBuffer;
import static org.lwjgl.opengl.ARBFramebufferObject.*;
import static org.lwjgl.opengl.GL11.*;
/**
* NOT DONE YET Shows the use of a frame buffer.
*
* @author Oskar Veerhoek
*/
public class FrameBufferDemo {
private static final String WINDOW_TITLE = "Frame Buffers!";
private static final int[] WINDOW_DIMENSIONS = {640, 480};
private static int fbo;
private static int rbo;
private static final LWJGLTimer timer = new LWJGLTimer();
private static boolean useReadPixels = true;
private static void render() {
glClear(GL_COLOR_BUFFER_BIT); // | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT
glRectf(-0.5f, -0.5f, 0.5f, 0.5f);
if (useReadPixels) {
FloatBuffer colorAtMouse = BufferTools.reserveData(16);
int mouse_x = Mouse.getX();
int mouse_y = Mouse.getY();
for (int i = 0; i < 50; i++) {
glReadPixels(mouse_x, mouse_y, 1, 1, GL_RGB, GL_FLOAT, colorAtMouse);
if (colorAtMouse.get(0) + colorAtMouse.get(1) + colorAtMouse.get(2) > 0.5f) {
glColor3d(0.8, 0.8, 0);
} else {
glColor3f(1, 1, 1);
}
}
} else {
int mouse_x = Mouse.getX();
int mouse_y = Mouse.getY();
for (int i = 0; i < 50; i++) {
if (mouse_x > 160 && mouse_x < 480 && mouse_y > 120 && mouse_y < 360) {
glColor3d(0.8, 0.8, 0);
} else {
glColor3f(1, 1, 1);
}
}
}
}
private static void logic() {
timer.update();
}
private static void input() {
while (Keyboard.next()) {
if (Keyboard.getEventKeyState()) {
switch (Keyboard.getEventKey()) {
case Keyboard.KEY_N:
useReadPixels = false;
break;
case Keyboard.KEY_M:
useReadPixels = true;
break;
}
}
}
}
private static void cleanUp(boolean asCrash) {
glDeleteFramebuffers(fbo);
glDeleteRenderbuffers(rbo);
Display.destroy();
System.exit(asCrash ? 1 : 0);
}
private static void setUpFramebuffer() {
fbo = glGenFramebuffers();
rbo = glGenRenderbuffers();
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
private static void setUpMatrices() {
// Add code for the initialization of the projection matrix here
}
private static void setUpTimer() {
timer.initialize();
}
private static void setUpStates() {
// glEnable(GL_DEPTH_TEST);
// glEnable(GL_LIGHTING);
// glEnable(GL_BLEND);
// glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
}
private static void update() {
Display.update();
Display.sync(60);
}
private static void enterGameLoop() {
while (!Display.isCloseRequested()) {
render();
logic();
input();
update();
}
}
private static void setUpDisplay() {
try {
Display.setDisplayMode(new DisplayMode(WINDOW_DIMENSIONS[0], WINDOW_DIMENSIONS[1]));
Display.setTitle(WINDOW_TITLE);
Display.create();
} catch (LWJGLException e) {
e.printStackTrace();
cleanUp(true);
}
}
public static void main(String[] args) {
setUpDisplay();
setUpStates();
setUpFramebuffer();
setUpMatrices();
setUpTimer();
enterGameLoop();
cleanUp(false);
}
}