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* JOGL2 OpenGL ES 2 demo to expose and learn what the RAW OpenGL ES 2 API looks like. * * Compile, run and enjoy: * javac -cp jar/jogl.all.jar:jar/gluegen-rt.jar RawGL2ES2demo.java * java -cp jar/jogl.all.jar:jar/gluegen-rt.jar:. RawGL2ES2demo *
* * * @author Xerxes Rånby (xranby) */ public class RawGL2ES2demo implements GLEventListener{ /* Introducing the OpenGL ES 2 Vertex shader * * The main loop inside the vertex shader gets executed * one time for each vertice. * * vertex -> * uniform data -> mat4 projection = ( 1, 0, 0, 0, * (0,1,0) / \ 0, 1, 0, 0, * / . \ <- origo (0,0,0) 0, 0, 1, 0, * / \ 0, 0,-1, 1 ); * vertex -> *-------* <- vertex * (-1,-1,0) (1,-1,0) <- attribute data can be used * (0, 0,1) for color, position, normals etc. * * The vertex shader recive input data in form of * "uniform" data that are common to all vertex * and * "attribute" data that are individual to each vertex. * One vertex can have several "attribute" data sources enabled. * * The vertex shader produce output used by the fragment shader. * gl_Position are expected to get set to the final vertex position. * You can also send additional user defined * "varying" data to the fragment shader. * * Model Translate, Scale and Rotate are done here by matrix-multiplying a * projection matrix against each vertex position. * * The whole vertex shader program are a String containing GLSL ES language * http://www.khronos.org/registry/gles/specs/2.0/GLSL_ES_Specification_1.0.17.pdf * sent to the GPU driver for compilation. */ static final String vertexShader = "#version 100 \n" + // GLSL ES language version, GLSL ES section 3.4 // many GPU drivers require it. "precision mediump float; \n" + // Precision Qualifiers "precision mediump int; \n" + // GLSL ES section 4.5.2 "uniform mat4 uniform_Projection; \n" + // Incomming data used by "attribute vec4 attribute_Position; \n" + // the vertex shader "attribute vec4 attribute_Color; \n" + // uniform and attributes "varying vec4 varying_Color; \n" + // Outgoing varying data // sent to the fragment shader "void main(void) \n" + "{ \n" + " varying_Color = attribute_Color; \n" + " gl_Position = uniform_Projection * attribute_Position; \n" + "} "; /* Introducing the OpenGL ES 2 Fragment shader * * The main loop of the fragment shader gets executed for each visible * pixel fragment on the render buffer. * * vertex-> * * (0,1,-1) /f\ * /ffF\ <- This fragment F gl_FragCoord get interpolated * /fffff\ to (0.25,0.25,-1) based on the * vertex-> *fffffff* <-vertex three vertex gl_Position. * (-1,-1,-1) (1,-1,-1) * * * All incomming "varying" and gl_FragCoord data to the fragment shader * gets interpolated based on the vertex positions. * * The fragment shader produce and store the final color data output into * gl_FragColor. * * Is up to you to set the final colors and calculate lightning here based on * supplied position, color and normal data. * * The whole fragment shader program are a String containing GLSL ES language * http://www.khronos.org/registry/gles/specs/2.0/GLSL_ES_Specification_1.0.17.pdf * sent to the GPU driver for compilation. */ static final String fragmentShader = "#version 100 \n" + "precision mediump float; \n" + "precision mediump int; \n" + "varying vec4 varying_Color; \n" + //incomming varying data to the //frament shader //sent from the vertex shader "void main (void)\n" + "{ \n" + " gl_FragColor = varying_Color; \n" + "} "; /* Introducing projection matrix helper functions * * OpenGL ES 2 vertex projection transformations gets applied inside the * vertex shader, all you have to calculate and supply a projection matrix. * * Its recomended to use the com/jogamp/opengl/util/PMVMatrix.java * import com.jogamp.opengl.util.PMVMatrix; * To simplify all your projection model view matrix creation needs. * * These helpers here are based on PMVMatrix code and common linear * algebra for matrix multiplication, translate and rotations. */ private void glMultMatrixf(final FloatBuffer a, final FloatBuffer b, FloatBuffer d) { final int aP = a.position(); final int bP = b.position(); final int dP = d.position(); for (int i = 0; i < 4; i++) { final float ai0=a.get(aP+i+0*4), ai1=a.get(aP+i+1*4), ai2=a.get(aP+i+2*4), ai3=a.get(aP+i+3*4); d.put(dP+i+0*4 , ai0 * b.get(bP+0+0*4) + ai1 * b.get(bP+1+0*4) + ai2 * b.get(bP+2+0*4) + ai3 * b.get(bP+3+0*4) ); d.put(dP+i+1*4 , ai0 * b.get(bP+0+1*4) + ai1 * b.get(bP+1+1*4) + ai2 * b.get(bP+2+1*4) + ai3 * b.get(bP+3+1*4) ); d.put(dP+i+2*4 , ai0 * b.get(bP+0+2*4) + ai1 * b.get(bP+1+2*4) + ai2 * b.get(bP+2+2*4) + ai3 * b.get(bP+3+2*4) ); d.put(dP+i+3*4 , ai0 * b.get(bP+0+3*4) + ai1 * b.get(bP+1+3*4) + ai2 * b.get(bP+2+3*4) + ai3 * b.get(bP+3+3*4) ); } } private float[] multiply(float[] a,float[] b){ float tmp[] = new float[16]; glMultMatrixf(FloatBuffer.wrap(a),FloatBuffer.wrap(b),FloatBuffer.wrap(tmp)); return tmp; } private float[] translate(float[] m,float x,float y,float z){ float t[] = { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, x, y, z, 1.0f }; return multiply(m, t); } private float[] rotate(float[] m,float a,float x,float y,float z){ float s, c; s = (float)Math.sin(Math.toRadians(a)); c = (float)Math.cos(Math.toRadians(a)); float r[] = { x * x * (1.0f - c) + c, y * x * (1.0f - c) + z * s, x * z * (1.0f - c) - y * s, 0.0f, x * y * (1.0f - c) - z * s, y * y * (1.0f - c) + c, y * z * (1.0f - c) + x * s, 0.0f, x * z * (1.0f - c) + y * s, y * z * (1.0f - c) - x * s, z * z * (1.0f - c) + c, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }; return multiply(m, r); } private void printMatrix(float[] m){ System.out.println(m[0]+" "+m[1]+" "+m[2]+" "+m[3]+"\n"+ m[4]+" "+m[5]+" "+m[6]+" "+m[7]+"\n"+ m[8]+" "+m[9]+" "+m[10]+" "+m[11]+"\n"+ m[12]+" "+m[13]+" "+m[14]+" "+m[15]+"\n"); } /* Introducing the GL2ES demo * * How to render a triangle using 424 lines of code using the RAW * OpenGL ES 2 API. * The Programmable pipeline in OpenGL ES 2 are both fast and flexible * yet it do take some extra lines of code to setup. * */ private double theta=0; private double s=0; private double c=0; private int shaderProgram; private int vertShader; private int fragShader; private int ModelViewProjectionMatrix_location; public static void main(String[] s){ GLCapabilities caps = new GLCapabilities(GLProfile.get(GLProfile.GL2ES2)); GLWindow canvas = GLWindow.create(caps); NewtCanvasAWT newtCanvas = new NewtCanvasAWT(canvas); JFrame frame = new JFrame("RAW GL2ES Demo"); frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); frame.setSize(300,300); frame.add(newtCanvas); //add some swing code if you like. /* javax.swing.JButton b = new javax.swing.JButton(); b.setText("Hi"); frame.add(b); */ frame.setVisible(true); canvas.addGLEventListener(new RawGL2ES2demo()); FPSAnimator animator = new FPSAnimator(canvas,60); animator.add(canvas); animator.start(); } public void init(GLAutoDrawable drawable) { GL2ES2 gl = drawable.getGL().getGL2ES2(); System.err.println("Chosen GLCapabilities: " + drawable.getChosenGLCapabilities()); System.err.println("INIT GL IS: " + gl.getClass().getName()); System.err.println("GL_VENDOR: " + gl.glGetString(GL.GL_VENDOR)); System.err.println("GL_RENDERER: " + gl.glGetString(GL.GL_RENDERER)); System.err.println("GL_VERSION: " + gl.glGetString(GL.GL_VERSION)); //Create shaders //OpenGL ES retuns a index id to be stored for future reference. vertShader = gl.glCreateShader(GL2ES2.GL_VERTEX_SHADER); fragShader = gl.glCreateShader(GL2ES2.GL_FRAGMENT_SHADER); //Compile the vertexShader String into a program. String[] vlines = new String[] { vertexShader }; int[] vlengths = new int[] { vlines[0].length() }; gl.glShaderSource(vertShader, vlines.length, vlines, vlengths, 0); gl.glCompileShader(vertShader); //Check compile status. int[] compiled = new int[1]; gl.glGetShaderiv(vertShader, GL2ES2.GL_COMPILE_STATUS, compiled,0); if(compiled[0]!=0){System.out.println("Horray! vertexShader compiled");} else { int[] logLength = new int[1]; gl.glGetShaderiv(vertShader, GL2ES2.GL_INFO_LOG_LENGTH, logLength, 0); byte[] log = new byte[logLength[0]]; gl.glGetShaderInfoLog(vertShader, logLength[0], (int[])null, 0, log, 0); System.err.println("Error compiling the shader: " + new String(log)); } //Compile the fragmentShader String into a program. String[] flines = new String[] { fragmentShader }; int[] flengths = new int[] { flines[0].length() }; gl.glShaderSource(fragShader, flines.length, flines, flengths, 0); gl.glCompileShader(fragShader); //Check compile status. gl.glGetShaderiv(fragShader, GL2ES2.GL_COMPILE_STATUS, compiled,0); if(compiled[0]!=0){System.out.println("Horray! fragmentShader compiled");} else { int[] logLength = new int[1]; gl.glGetShaderiv(fragShader, GL2ES2.GL_INFO_LOG_LENGTH, logLength, 0); byte[] log = new byte[logLength[0]]; gl.glGetShaderInfoLog(fragShader, logLength[0], (int[])null, 0, log, 0); System.err.println("Error compiling the shader: " + new String(log)); } //Each shaderProgram must have //one vertex shader and one fragment shader. shaderProgram = gl.glCreateProgram(); gl.glAttachShader(shaderProgram, vertShader); gl.glAttachShader(shaderProgram, fragShader); //Associate attribute ids with the attribute names inside //the vertex shader. gl.glBindAttribLocation(shaderProgram, 0, "attribute_Position"); gl.glBindAttribLocation(shaderProgram, 1, "attribute_Color"); gl.glLinkProgram(shaderProgram); //Get a id number to the uniform_Projection matrix //so that we can update it. ModelViewProjectionMatrix_location = gl.glGetUniformLocation(shaderProgram, "uniform_Projection"); } public void reshape(GLAutoDrawable drawable, int x, int y, int z, int h) { } public void display(GLAutoDrawable drawable) { // Update variables used in animation theta += 0.08; s = Math.sin(theta); c = Math.cos(theta); // Get gl GL2ES2 gl = drawable.getGL().getGL2ES2(); // Set viewport //gl.glViewport(0,0,300,300); // Clear screen gl.glClearColor(1, 0, 1, 1); //Purple gl.glClear(GL2ES2.GL_COLOR_BUFFER_BIT | GL2ES2.GL_DEPTH_BUFFER_BIT); // Use the shaderProgram that got linked during the init part. gl.glUseProgram(shaderProgram); /* Change a projection matrix * The matrix multiplications and OpenGL ES2 code below * basically match this OpenGL ES1 code. * note that the model_view_projection matrix gets sent to the vertexShader. * * gl.glLoadIdentity(); * gl.glTranslatef(0.0f,0.0f,-0.1f); * gl.glRotatef((float)30f*(float)s,1.0f,0.0f,1.0f); * */ float model_view_projection[]; float identity_matrix[] = { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f, 0.0f, 0.0f, 1.0f, }; model_view_projection = translate(identity_matrix,0.0f,0.0f, -0.1f); model_view_projection = rotate(model_view_projection,(float)30f*(float)s,1.0f,0.0f,1.0f); // Send the final projection matrix to the vertex shader by // using the uniform location id obtained during the init part. gl.glUniformMatrix4fv(ModelViewProjectionMatrix_location, 1, false, model_view_projection, 0); /* * Render a triangle: * The OpenGL ES2 code below basically match this OpenGL code. * * gl.glBegin(GL_TRIANGLES); // Drawing Using Triangles * gl.glVertex3f( 0.0f, 1.0f, 0.0f); // Top * gl.glVertex3f(-1.0f,-1.0f, 0.0f); // Bottom Left * gl.glVertex3f( 1.0f,-1.0f, 0.0f); // Bottom Right * gl.glEnd(); // Finished Drawing The Triangle */ float vertices[] = { 0.0f, 1.0f, 0.0f, //Top -1.0f, -1.0f, 0.0f, //Bottom Left 1.0f, -1.0f, 0.0f //Bottom Right }; gl.glVertexAttribPointer(0, 3, GL2ES2.GL_FLOAT, false, 0, FloatBuffer.wrap(vertices)); gl.glEnableVertexAttribArray(0); float colors[] = { 1.0f, 0.0f, 0.0f, //Top color (red) 0.0f, 0.0f, 0.0f, //Bottom Left color (black) 1.0f, 1.0f, 0.0f //Bottom Right color (yellow) }; gl.glVertexAttribPointer(1, 3, GL2ES2.GL_FLOAT, false, 0, FloatBuffer.wrap(colors)); gl.glEnableVertexAttribArray(1); gl.glDrawArrays(GL2ES2.GL_TRIANGLES, 0, 3); //Draw the vertices as triangle gl.glDisableVertexAttribArray(0); // Allow release of vertex position memory gl.glDisableVertexAttribArray(1); // Allow release of vertex color memory } public void dispose(GLAutoDrawable drawable){ System.out.println("cleanup, remember to release shaders"); GL2ES2 gl = drawable.getGL().getGL2ES2(); gl.glUseProgram(0); gl.glDetachShader(shaderProgram, vertShader); gl.glDeleteShader(vertShader); gl.glDetachShader(shaderProgram, fragShader); gl.glDeleteShader(fragShader); gl.glDeleteProgram(shaderProgram); } }