/*
* Copyright (c) 2002-2011 LWJGL Project
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* modification, are permitted provided that the following conditions are
* met:
*
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*
* * Redistributions in binary form must reproduce the above copyright
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* documentation and/or other materials provided with the distribution.
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*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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package org.lwjgl.test.opengl.sprites;
import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.Sys;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.*;
import java.awt.image.BufferedImage;
import java.awt.image.Raster;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.util.Random;
import javax.imageio.ImageIO;
import static org.lwjgl.opengl.EXTTransformFeedback.*;
import static org.lwjgl.opengl.GL11.*;
import static org.lwjgl.opengl.GL12.*;
import static org.lwjgl.opengl.GL15.*;
import static org.lwjgl.opengl.GL20.*;
import static org.lwjgl.opengl.GL30.*;
/**
* Sprite rendering demo. In this version we're doing the animation
* computations on the GPU, using transform feedback and a vertex
* shader, then rendering is performed in 2 passes, with depth testing
* enabled:
* 1) Sprites are rendered front-to-back, opaque fragments only, blending is disabled.
* 2) Sprites are rendered back-to-front, transparent fragments only, blending is enabled.
* Sorting is free, because we're animating double the amount of sprites rendered, the
* first batch is sorted f2b, the second is sorted b2f. Ordering is achieved by modifying
* the z-axis position of the sprites in the vertex shader.
*
* @author Spasi
* @since 18/3/2011
*/
public final class SpriteShootout2P {
private static final int SCREEN_WIDTH = 800;
private static final int SCREEN_HEIGHT = 600;
private static final int ANIMATION_TICKS = 60;
private boolean run = true;
private boolean render = true;
private boolean colorMask = true;
private boolean animate = true;
private boolean smooth;
private boolean vsync;
private int ballSize = 42;
private int ballCount = 100 * 1000;
private SpriteRenderer renderer;
// OpenGL stuff
private int texID;
private int texBigID;
private int texSmallID;
private SpriteShootout2P() {
}
public static void main(String[] args) {
try {
new SpriteShootout2P().start();
} catch (LWJGLException e) {
e.printStackTrace();
}
}
private void start() throws LWJGLException {
try {
initGL();
renderer = new SpriteRendererTF();
updateBalls(ballCount);
run();
} catch (Throwable t) {
t.printStackTrace();
} finally {
destroy();
}
}
private void initGL() throws LWJGLException {
Display.setLocation((Display.getDisplayMode().getWidth() - SCREEN_WIDTH) / 2,
(Display.getDisplayMode().getHeight() - SCREEN_HEIGHT) / 2);
Display.setDisplayMode(new DisplayMode(SCREEN_WIDTH, SCREEN_HEIGHT));
Display.setTitle("Sprite Shootout 2-pass");
Display.create(new PixelFormat(0, 24, 0));
//Display.create(new PixelFormat(), new ContextAttribs(4, 1).withProfileCompatibility(true).withDebug(true));
//AMDDebugOutput.glDebugMessageCallbackAMD(new AMDDebugOutputCallback());
final ContextCapabilities caps = GLContext.getCapabilities();
if ( !(caps.OpenGL30 || (caps.OpenGL20 && caps.GL_EXT_transform_feedback)) )
throw new RuntimeException("OpenGL 3.0 or 2.0 + EXT_transform_feedback is required for this demo.");
// Setup viewport
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho(0, SCREEN_WIDTH, 0, SCREEN_HEIGHT, -1.0, 1.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glViewport(0, 0, SCREEN_WIDTH, SCREEN_HEIGHT);
glClearColor(1.0f, 1.0f, 1.0f, 0.0f);
// Create textures
try {
texSmallID = createTexture("res/ball_sm.png");
texBigID = createTexture("res/ball.png");
} catch (IOException e) {
e.printStackTrace();
System.exit(-1);
}
texID = texBigID;
// Setup rendering state
glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_ALPHA_TEST);
glColorMask(colorMask, colorMask, colorMask, false);
glDepthMask(true);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glClearDepth(1.0f);
if ( caps.GL_ARB_compatibility || !caps.OpenGL31 )
glEnable(GL_POINT_SPRITE);
// Setup geometry
glEnableClientState(GL_VERTEX_ARRAY);
Util.checkGLError();
}
private static int createTexture(final String path) throws IOException {
final BufferedImage img = ImageIO.read(SpriteShootout2P.class.getClassLoader().getResource(path));
final int w = img.getWidth();
final int h = img.getHeight();
final ByteBuffer buffer = readImage(img);
final int texID = glGenTextures();
glBindTexture(GL_TEXTURE_2D, texID);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_BGRA, GL_UNSIGNED_BYTE, buffer);
return texID;
}
private static ByteBuffer readImage(final BufferedImage img) throws IOException {
final Raster raster = img.getRaster();
final int bands = raster.getNumBands();
final int w = img.getWidth();
final int h = img.getHeight();
final int size = w * h * bands;
final byte[] pixels = new byte[size];
raster.getDataElements(0, 0, w, h, pixels);
final ByteBuffer pbuffer = BufferUtils.createByteBuffer(size);
if ( bands == 4 ) {
for ( int i = 0; i < (w * h * 4); i += 4 ) {
// Pre-multiply alpha
final float a = unpackUByte01(pixels[i + 3]);
pbuffer.put(packUByte01(unpackUByte01(pixels[i + 2]) * a));
pbuffer.put(packUByte01(unpackUByte01(pixels[i + 1]) * a));
pbuffer.put(packUByte01(unpackUByte01(pixels[i + 0]) * a));
pbuffer.put(pixels[i + 3]);
}
} else if ( bands == 3 ) {
for ( int i = 0; i < (w * h * 3); i += 3 ) {
pbuffer.put(pixels[i + 2]);
pbuffer.put(pixels[i + 1]);
pbuffer.put(pixels[i + 0]);
}
} else
pbuffer.put(pixels, 0, size);
pbuffer.flip();
return pbuffer;
}
private static float unpackUByte01(final byte x) {
return (x & 0xFF) / 255.0f;
}
private static byte packUByte01(final float x) {
return (byte)(x * 255.0f);
}
private void updateBalls(final int count) {
System.out.println("NUMBER OF BALLS: " + count);
renderer.updateBalls(ballCount);
}
private void run() {
long startTime = System.currentTimeMillis() + 5000;
long fps = 0;
long time = Sys.getTime();
final int ticksPerUpdate = (int)(Sys.getTimerResolution() / ANIMATION_TICKS);
renderer.render(false, true, 0);
while ( run ) {
Display.processMessages();
handleInput();
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
final long currTime = Sys.getTime();
final int delta = (int)(currTime - time);
if ( smooth || delta >= ticksPerUpdate ) {
renderer.render(render, animate, delta);
time = currTime;
} else
renderer.render(render, false, 0);
Display.update(false);
//Display.sync(60);
if ( startTime > System.currentTimeMillis() ) {
fps++;
} else {
long timeUsed = 5000 + (startTime - System.currentTimeMillis());
startTime = System.currentTimeMillis() + 5000;
System.out.println("FPS: " + (Math.round(fps / (timeUsed / 1000.0) * 10) / 10.0) + ", Balls: " + ballCount);
fps = 0;
}
}
}
private void handleInput() {
if ( Display.isCloseRequested() )
run = false;
while ( Keyboard.next() ) {
if ( Keyboard.getEventKeyState() )
continue;
switch ( Keyboard.getEventKey() ) {
case Keyboard.KEY_1:
case Keyboard.KEY_2:
case Keyboard.KEY_3:
case Keyboard.KEY_4:
case Keyboard.KEY_5:
case Keyboard.KEY_6:
case Keyboard.KEY_7:
case Keyboard.KEY_8:
case Keyboard.KEY_9:
case Keyboard.KEY_0:
ballCount = 1 << (Keyboard.getEventKey() - Keyboard.KEY_1);
updateBalls(ballCount);
break;
case Keyboard.KEY_ADD:
case Keyboard.KEY_SUBTRACT:
int mult;
if ( Keyboard.isKeyDown(Keyboard.KEY_LSHIFT) || Keyboard.isKeyDown(Keyboard.KEY_RSHIFT) ) {
mult = 1000;
if ( Keyboard.isKeyDown(Keyboard.KEY_LCONTROL) || Keyboard.isKeyDown(Keyboard.KEY_RCONTROL) )
mult *= 5;
} else if ( Keyboard.isKeyDown(Keyboard.KEY_LMENU) || Keyboard.isKeyDown(Keyboard.KEY_RMENU) )
mult = 100;
else if ( Keyboard.isKeyDown(Keyboard.KEY_LCONTROL) || Keyboard.isKeyDown(Keyboard.KEY_RCONTROL) )
mult = 10;
else
mult = 1;
if ( Keyboard.getEventKey() == Keyboard.KEY_SUBTRACT )
mult = -mult;
ballCount += mult * 100;
if ( ballCount <= 0 )
ballCount = 1;
updateBalls(ballCount);
break;
case Keyboard.KEY_ESCAPE:
run = false;
break;
case Keyboard.KEY_A:
animate = !animate;
System.out.println("Animation is now " + (animate ? "on" : "off") + ".");
break;
case Keyboard.KEY_C:
colorMask = !colorMask;
glColorMask(colorMask, colorMask, colorMask, false);
System.out.println("Color mask is now " + (colorMask ? "on" : "off") + ".");
// Disable alpha test when color mask is off, else we get no benefit.
if ( colorMask ) {
glEnable(GL_BLEND);
glEnable(GL_ALPHA_TEST);
} else {
glDisable(GL_BLEND);
glDisable(GL_ALPHA_TEST);
}
break;
case Keyboard.KEY_R:
render = !render;
System.out.println("Rendering is now " + (render ? "on" : "off") + ".");
break;
case Keyboard.KEY_S:
smooth = !smooth;
System.out.println("Smooth animation is now " + (smooth ? "on" : "off") + ".");
break;
case Keyboard.KEY_T:
if ( texID == texBigID ) {
texID = texSmallID;
ballSize = 16;
} else {
texID = texBigID;
ballSize = 42;
}
renderer.updateBallSize();
glBindTexture(GL_TEXTURE_2D, texID);
System.out.println("Now using the " + (texID == texBigID ? "big" : "small") + " texture.");
break;
case Keyboard.KEY_V:
vsync = !vsync;
Display.setVSyncEnabled(vsync);
System.out.println("VSYNC is now " + (vsync ? "enabled" : "disabled") + ".");
break;
}
}
while ( Mouse.next() ) ;
}
private void destroy() {
Display.destroy();
}
private abstract class SpriteRenderer {
protected int progID;
protected void createPrograms(final int vshID) {
// Opaque pass
final int fshID = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fshID, "uniform sampler2D COLOR_MAP;\n" +
"void main(void) {\n" +
" gl_FragColor = texture2D(COLOR_MAP, gl_PointCoord);\n" +
"}");
glCompileShader(fshID);
if ( glGetShaderi(fshID, GL_COMPILE_STATUS) == GL_FALSE ) {
System.out.println(glGetShaderInfoLog(fshID, glGetShaderi(fshID, GL_INFO_LOG_LENGTH)));
throw new RuntimeException("Failed to compile fragment shader.");
}
progID = glCreateProgram();
glAttachShader(progID, vshID);
glAttachShader(progID, fshID);
glLinkProgram(progID);
if ( glGetProgrami(progID, GL_LINK_STATUS) == GL_FALSE ) {
System.out.println(glGetProgramInfoLog(progID, glGetProgrami(progID, GL_INFO_LOG_LENGTH)));
throw new RuntimeException("Failed to link shader program.");
}
glUseProgram(progID);
glUniform1i(glGetUniformLocation(progID, "COLOR_MAP"), 0);
updateBallSize();
glEnableClientState(GL_VERTEX_ARRAY);
}
public void updateBallSize() {
glPointSize(ballSize);
}
protected abstract void updateBalls(final int count);
protected abstract void render(boolean render, boolean animate, int delta);
}
private class SpriteRendererTF extends SpriteRenderer {
private int progIDTF;
private int ballSizeLoc;
private int deltaLoc;
private int[] tfVBO = new int[2];
private int currVBO;
private int depthVBO;
private int depthLoc;
SpriteRendererTF() {
System.out.println("Shootout Implementation: TF GPU animation & 2-pass rendering");
// Transform-feedback program
int vshID = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vshID, "#version 130\n" +
"const float WIDTH = " + SCREEN_WIDTH + ";\n" +
"const float HEIGHT = " + SCREEN_HEIGHT + ";\n" +
"uniform float ballSize;\n" + // ballSize / 2
"uniform float delta;\n" +
"void main(void) {\n" +
" vec4 anim = gl_Vertex;\n" +
" anim.xy = anim.xy + anim.zw * delta;\n" +
" vec2 animC = clamp(anim.xy, vec2(ballSize), vec2(WIDTH - ballSize, HEIGHT - ballSize));\n" +
" if ( anim.x != animC.x ) anim.z = -anim.z;\n" +
" if ( anim.y != animC.y ) anim.w = -anim.w;\n" +
" gl_Position = vec4(animC, anim.zw);\n" +
"}");
glCompileShader(vshID);
if ( glGetShaderi(vshID, GL_COMPILE_STATUS) == GL_FALSE ) {
System.out.println(glGetShaderInfoLog(vshID, glGetShaderi(vshID, GL_INFO_LOG_LENGTH)));
throw new RuntimeException("Failed to compile vertex shader.");
}
progIDTF = glCreateProgram();
glAttachShader(progIDTF, vshID);
glTransformFeedbackVaryings(progIDTF, new CharSequence[] { "gl_Position" }, GL_SEPARATE_ATTRIBS);
glLinkProgram(progIDTF);
if ( glGetProgrami(progIDTF, GL_LINK_STATUS) == GL_FALSE ) {
System.out.println(glGetProgramInfoLog(progIDTF, glGetProgrami(progIDTF, GL_INFO_LOG_LENGTH)));
throw new RuntimeException("Failed to link shader program.");
}
glUseProgram(progIDTF);
ballSizeLoc = glGetUniformLocation(progIDTF, "ballSize");
deltaLoc = glGetUniformLocation(progIDTF, "delta");
glUniform1f(ballSizeLoc, ballSize * 0.5f);
// -----------------
vshID = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vshID, "#version 130\n" +
"in float depth;\n" +
"void main(void) {\n" +
" gl_Position = gl_ModelViewProjectionMatrix * vec4(gl_Vertex.xy, depth, gl_Vertex.w);\n" +
"}");
glCompileShader(vshID);
if ( glGetShaderi(vshID, GL_COMPILE_STATUS) == GL_FALSE ) {
System.out.println(glGetShaderInfoLog(vshID, glGetShaderi(vshID, GL_INFO_LOG_LENGTH)));
throw new RuntimeException("Failed to compile vertex shader.");
}
createPrograms(vshID);
depthLoc = glGetAttribLocation(progID, "depth");
// -----------------
}
public void updateBallSize() {
glUseProgram(progIDTF);
glUniform1f(ballSizeLoc, ballSize * 0.5f);
super.updateBallSize();
}
public void updateBalls(final int count) {
// Depth data
final FloatBuffer depths = BufferUtils.createFloatBuffer(count * 2);
final float depthStep = 1.9f / count;
float depth = Float.parseFloat("0x1.fffffep-1");
// Front-to-back
for ( int i = 0; i < count; i++ ) {
depths.put(depth);
depth -= depthStep;
}
// Back-to-front
for ( int i = 0; i < count; i++ )
depths.put(depths.get(count - 1 - i));
depths.flip();
if ( depthVBO != 0 )
glDeleteBuffers(depthVBO);
depthVBO = glGenBuffers();
glBindBuffer(GL_ARRAY_BUFFER, depthVBO);
glBufferData(GL_ARRAY_BUFFER, depths, GL_STATIC_DRAW);
glEnableVertexAttribArray(depthLoc);
glVertexAttribPointer(depthLoc, 1, GL_FLOAT, false, 0, 0);
// Animation data
final FloatBuffer transform = BufferUtils.createFloatBuffer(count * 2 * 4);
// Front-to-back
final Random random = new Random();
for ( int i = 0; i < count; i++ ) {
transform.put((int)(random.nextFloat() * (SCREEN_WIDTH - ballSize) + ballSize * 0.5f));
transform.put((int)(random.nextFloat() * (SCREEN_HEIGHT - ballSize) + ballSize * 0.5f));
transform.put(random.nextFloat() * 0.4f - 0.2f);
transform.put(random.nextFloat() * 0.4f - 0.2f);
}
// Back-to-front
for ( int i = 0; i < count; i++ ) {
final int offset = (count - 1 - i) * 4;
transform.put(transform.get(offset + 0));
transform.put(transform.get(offset + 1));
transform.put(transform.get(offset + 2));
transform.put(transform.get(offset + 3));
}
transform.flip();
if ( tfVBO[0] != 0 ) {
for ( int i = 0; i < tfVBO.length; i++ )
glDeleteBuffers(tfVBO[i]);
}
for ( int i = 0; i < tfVBO.length; i++ ) {
tfVBO[i] = glGenBuffers();
glBindBuffer(GL_TRANSFORM_FEEDBACK_BUFFER, tfVBO[i]);
glBufferData(GL_TRANSFORM_FEEDBACK_BUFFER, transform, GL_STATIC_DRAW);
}
glBindBuffer(GL_ARRAY_BUFFER, tfVBO[0]);
glVertexPointer(2, GL_FLOAT, (4 * 4), 0);
}
public void render(final boolean render, final boolean animate, final int delta) {
if ( animate ) {
glDisableVertexAttribArray(depthLoc);
final int vbo = currVBO;
currVBO = 1 - currVBO;
glUseProgram(progIDTF);
glUniform1f(deltaLoc, delta);
glBindBuffer(GL_ARRAY_BUFFER, tfVBO[vbo]);
glVertexPointer(4, GL_FLOAT, 0, 0);
glEnable(GL_RASTERIZER_DISCARD);
if ( GLContext.getCapabilities().OpenGL30 ) {
glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, tfVBO[1 - vbo]);
glBeginTransformFeedback(GL_POINTS);
glDrawArrays(GL_POINTS, 0, ballCount * 2);
glEndTransformFeedback();
} else {
glBindBufferBaseEXT(GL_TRANSFORM_FEEDBACK_BUFFER_EXT, 0, tfVBO[1 - vbo]);
glBeginTransformFeedbackEXT(GL_POINTS);
glDrawArrays(GL_POINTS, 0, ballCount * 2);
glEndTransformFeedbackEXT();
}
glDisable(GL_RASTERIZER_DISCARD);
glUseProgram(progID);
glVertexPointer(2, GL_FLOAT, (4 * 4), 0);
glEnableVertexAttribArray(depthLoc);
}
if ( render ) {
// Render front-to-back opaque pass
glAlphaFunc(GL_EQUAL, 1.0f);
glDisable(GL_BLEND);
glDrawArrays(GL_POINTS, 0, ballCount);
glEnable(GL_BLEND);
// Render back-to-front transparent pass
glAlphaFunc(GL_GREATER, 0.0f); // Fragments with alpha == 1.0 are early-depth-rejected.
glDepthMask(false);
glDrawArrays(GL_POINTS, ballCount, ballCount);
glDepthMask(true);
}
}
}
}