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package com.jogamp.opengl.test.junit.jogl.demos.gl4;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.nio.FloatBuffer;
import java.util.Random;
import javax.media.opengl.DebugGL4;
import javax.media.opengl.GL;
import javax.media.opengl.GL2;
import javax.media.opengl.GL2ES2;
import javax.media.opengl.GL4;
import javax.media.opengl.GLAutoDrawable;
import javax.media.opengl.GLEventListener;
import javax.media.opengl.GLException;
import javax.media.opengl.GLUniformData;
import javax.media.opengl.TraceGL4;
import com.jogamp.opengl.math.Matrix4;
import com.jogamp.opengl.util.GLArrayDataClient;
import com.jogamp.opengl.util.GLArrayDataServer;
import com.jogamp.opengl.util.PMVMatrix;
import com.jogamp.opengl.util.glsl.ShaderCode;
import com.jogamp.opengl.util.glsl.ShaderProgram;
import com.jogamp.opengl.util.glsl.ShaderState;
public class TriangleInstancedRendererWithShaderState implements GLEventListener {
private float aspect;
private static final String shaderBasename = "triangles";
// private static final boolean useInterleaved = false;
private static final boolean useInterleaved = true;
private ShaderState st;
private PMVMatrix projectionMatrix;
private GLUniformData projectionMatrixUniform;
private GLUniformData transformMatrixUniform;
private GLArrayDataServer interleavedVBO;
private GLArrayDataClient verticesVBO;
private GLArrayDataClient colorsVBO;
private static final int NO_OF_INSTANCE = 30;
private final FloatBuffer triangleTransform = FloatBuffer.allocate(16 * NO_OF_INSTANCE);
private final Matrix4[] mat = new Matrix4[NO_OF_INSTANCE];
private final float[] rotationSpeed = new float[NO_OF_INSTANCE];
private static final boolean useTraceGL = false;
private PrintStream stream;
private final IInstancedRenderingView view;
private boolean isInitialized = false;
public TriangleInstancedRendererWithShaderState(IInstancedRenderingView view) {
this.view = view;
if(useTraceGL) {
try {
stream = new PrintStream(new FileOutputStream(new File("instanced-with-st.txt")));
} catch (IOException e1) {
e1.printStackTrace();
}
}
initTransform();
}
private void initTransform() {
Random rnd = new Random();
for(int i = 0; i < NO_OF_INSTANCE; i++) {
rotationSpeed[i] = 0.3f * rnd.nextFloat();
mat[i] = new Matrix4();
mat[i].loadIdentity();
float scale = 1f + 4 * rnd.nextFloat();
mat[i].scale(scale, scale, scale);
//setup initial position of each triangle
mat[i].translate(20f * rnd.nextFloat() - 10f,
10f * rnd.nextFloat() - 5f,
0f);
}
}
@Override
public void init(GLAutoDrawable drawable) {
GL4 gl = drawable.getGL().getGL4();
drawable.setGL(new DebugGL4(gl));
if(useTraceGL) {
drawable.setGL(new TraceGL4(gl, stream));
}
gl.glClearColor(1, 1, 1, 1); //white background
// gl.glClearColor(0, 0, 0, 1); //black background
gl.glClearDepth(1.0f);
System.err.println("Chosen GLCapabilities: " + drawable.getChosenGLCapabilities());
System.err.println("INIT GL IS: " + gl.getClass().getName());
System.err.println("GL_VENDOR: " + gl.glGetString(GL4.GL_VENDOR));
System.err.println("GL_RENDERER: " + gl.glGetString(GL4.GL_RENDERER));
System.err.println("GL_VERSION: " + gl.glGetString(GL4.GL_VERSION));
initShader(gl);
projectionMatrix = new PMVMatrix();
projectionMatrixUniform = new GLUniformData("mgl_PMatrix", 4, 4, projectionMatrix.glGetPMatrixf());
st.ownUniform(projectionMatrixUniform);
if(!st.uniform(gl, projectionMatrixUniform)) {
throw new GLException("Error setting mgl_PMatrix in shader: " + st);
}
transformMatrixUniform = new GLUniformData("mgl_MVMatrix", 4, 4, triangleTransform);
st.ownUniform(transformMatrixUniform);
if(!st.uniform(gl, transformMatrixUniform)) {
throw new GLException("Error setting mgl_MVMatrix in shader: " + st);
}
if(useInterleaved) {
initVBO_interleaved(gl);
} else {
initVBO_nonInterleaved(gl);
}
isInitialized = true;
}
@Override
public void display(GLAutoDrawable drawable) {
if(!isInitialized ) return;
GL4 gl = drawable.getGL().getGL4();
gl.glClear(GL4.GL_COLOR_BUFFER_BIT | GL4.GL_DEPTH_BUFFER_BIT);
st.useProgram(gl, true);
projectionMatrix.glMatrixMode(GL2.GL_PROJECTION);
projectionMatrix.glPushMatrix();
float winScale = 0.1f;
if(view != null) winScale = view.getScale();
projectionMatrix.glScalef(winScale, winScale, winScale);
projectionMatrix.update();
st.uniform(gl, projectionMatrixUniform);
projectionMatrix.glPopMatrix();
generateTriangleTransform();
st.uniform(gl, transformMatrixUniform);
if(useInterleaved) {
interleavedVBO.enableBuffer(gl, true);
} else {
verticesVBO.enableBuffer(gl, true);
colorsVBO.enableBuffer(gl, true);
}
//gl.glVertexAttribDivisor() is not required since each instance has the same attribute (color).
gl.glDrawArraysInstanced(GL4.GL_TRIANGLES, 0, 3, NO_OF_INSTANCE);
if(useInterleaved) {
interleavedVBO.enableBuffer(gl, false);
} else {
verticesVBO.enableBuffer(gl, false);
colorsVBO.enableBuffer(gl, false);
}
st.useProgram(gl, false);
}
@Override
public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
GL4 gl3 = drawable.getGL().getGL4();
gl3.glViewport(0, 0, width, height);
aspect = (float) width / (float) height;
projectionMatrix.glMatrixMode(GL2.GL_PROJECTION);
projectionMatrix.glLoadIdentity();
projectionMatrix.gluPerspective(45, aspect, 0.001f, 20f);
projectionMatrix.gluLookAt(0, 0, -10, 0, 0, 0, 0, 1, 0);
}
@Override
public void dispose(GLAutoDrawable drawable){
GL4 gl = drawable.getGL().getGL4();
st.destroy(gl);
}
private void generateTriangleTransform() {
triangleTransform.clear();
for(int i = 0; i < NO_OF_INSTANCE; i++) {
mat[i].rotate(rotationSpeed[i], 0, 0, 1);
triangleTransform.put(mat[i].getMatrix());
}
triangleTransform.rewind();
}
private void initVBO_nonInterleaved(GL4 gl) {
int VERTEX_COUNT = 3;
verticesVBO = GLArrayDataClient.createGLSL("mgl_Vertex", 3, GL4.GL_FLOAT, false, VERTEX_COUNT);
FloatBuffer verticeBuf = (FloatBuffer)verticesVBO.getBuffer();
verticeBuf.put(vertices);
verticesVBO.seal(gl, true);
colorsVBO = GLArrayDataClient.createGLSL("mgl_Color", 4, GL4.GL_FLOAT, false, VERTEX_COUNT);
FloatBuffer colorBuf = (FloatBuffer)colorsVBO.getBuffer();
colorBuf.put(colors);
colorsVBO.seal(gl, true);
verticesVBO.enableBuffer(gl, false);
colorsVBO.enableBuffer(gl, false);
st.ownAttribute(verticesVBO, true);
st.ownAttribute(colorsVBO, true);
st.useProgram(gl, false);
}
private void initVBO_interleaved(GL4 gl) {
int VERTEX_COUNT = 3;
interleavedVBO = GLArrayDataServer.createGLSLInterleaved(3 + 4, GL.GL_FLOAT, false, VERTEX_COUNT, GL.GL_STATIC_DRAW);
interleavedVBO.addGLSLSubArray("mgl_Vertex", 3, GL.GL_ARRAY_BUFFER);
interleavedVBO.addGLSLSubArray("mgl_Color", 4, GL.GL_ARRAY_BUFFER);
FloatBuffer ib = (FloatBuffer)interleavedVBO.getBuffer();
for(int i = 0; i < VERTEX_COUNT; i++) {
ib.put(vertices, i*3, 3);
ib.put(colors, i*4, 4);
}
interleavedVBO.seal(gl, true);
interleavedVBO.enableBuffer(gl, false);
st.ownAttribute(interleavedVBO, true);
st.useProgram(gl, false);
}
private void initShader(GL4 gl) {
// Create & Compile the shader objects
ShaderCode vp0 = ShaderCode.create(gl, GL2ES2.GL_VERTEX_SHADER, this.getClass(),
"shader", "shader/bin", shaderBasename, true);
ShaderCode fp0 = ShaderCode.create(gl, GL2ES2.GL_FRAGMENT_SHADER, this.getClass(),
"shader", "shader/bin", shaderBasename, true);
vp0.replaceInShaderSource("NO_OF_INSTANCE", String.valueOf(NO_OF_INSTANCE));
vp0.defaultShaderCustomization(gl, true, true);
fp0.defaultShaderCustomization(gl, true, true);
//vp0.dumpShaderSource(System.out);
// Create & Link the shader program
ShaderProgram sp = new ShaderProgram();
sp.add(vp0);
sp.add(fp0);
if(!sp.link(gl, System.err)) {
throw new GLException("Couldn't link program: "+sp);
}
// Let's manage all our states using ShaderState.
st = new ShaderState();
st.attachShaderProgram(gl, sp, true);
}
private static final float[] vertices = {
1.0f, 0.0f, 0,
-0.5f, 0.866f, 0,
-0.5f, -0.866f, 0
};
private final float[] colors = {
1.0f, 0.0f, 0.0f, 1.0f,
0.0f, 1.0f, 0.0f, 1.0f,
0f, 0f, 1.0f, 1f
};
}
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