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  [Solved] Render to texture problem  (Read 1256 times)
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Offline elect

Junior Member





« Posted 2012-02-20 15:04:16 »

Hi,

basically when I am rendering to texture, it looks like some part of the texture go lost..

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package org.yourorghere;

import com.jogamp.opengl.util.GLBuffers;
import java.awt.Component;
import java.nio.ByteBuffer;
import javax.media.opengl.*;
import javax.media.opengl.glu.GLU;


public class GLRenderer implements GLEventListener {

    int[] textureID = new int[1];
    private int floorWidth=48, floorHeight=48;
    int[] frameBufferID = new int[1];
    int[] depthRenderBufferID = new int[1];
    ByteBuffer pixels;
    GLU glu;
   
    public void init(GLAutoDrawable drawable) {
        glu = new GLU();
       
        System.out.println("init");
       
        GL2 gl = drawable.getGL().getGL2();
        System.err.println("INIT GL IS: " + gl.getClass().getName());

        // Setup the drawing area and shading mode
       gl.glShadeModel(GL2.GL_SMOOTH); // try setting this to GL_FLAT and see what happens.
       
        renderShadowsToTexture(gl);
       
        gl.glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
    }

    public void reshape(GLAutoDrawable drawable, int x, int y, int width, int height) {
    }

    public void display(GLAutoDrawable drawable) {
        GL2 gl = drawable.getGL().getGL2();

        System.out.println("display");
       
        float a = 1.0f;
       
        gl.glMatrixMode(GL2.GL_PROJECTION);
        // Reset the current matrix to the "identity"
       gl.glLoadIdentity();
        glu.gluPerspective(60.0f, (((Component)drawable).getWidth()/
                ((Component)drawable).getHeight()), 1.0f, 50.0f);

        gl.glMatrixMode(GL2.GL_MODELVIEW);
        gl.glLoadIdentity();
        glu.gluLookAt(0.0f, 0.0f, 0.0f,
                      0.0f, 0.0f, 1.0f,
                      0.0f, 1.0f, 0.0f);
       
        // Clear the drawing area
       gl.glClear(GL2.GL_COLOR_BUFFER_BIT | GL2.GL_DEPTH_BUFFER_BIT);

        gl.glTranslatef(-2.5f, 0.0f, 0.0f);
       
        gl.glEnable(GL2.GL_TEXTURE_2D);
       
        gl.glBindTexture(GL2.GL_TEXTURE_2D, textureID[0]);
       
            gl.glColor3f(1.0f, 1.0f, 1.0f);
            gl.glBegin(GL2.GL_QUADS);
                gl.glTexCoord2f(0, 0);
                gl.glVertex3f(-1.0f,-1.0f, 0.0f);
                gl.glTexCoord2f(0, a);
                gl.glVertex3f(-1.0f, 1.0f, 0.0f);
                gl.glTexCoord2f(1.0f, 1.0f);
                gl.glVertex3f( 1.0f, 1.0f, 0.0f);
                gl.glTexCoord2f(a, 0);
                gl.glVertex3f( 1.0f,-1.0f, 0.0f);
            gl.glEnd();
        gl.glDisable(GL2.GL_TEXTURE_2D);
       
        gl.glRasterPos2d(3, -2);
        gl.glDrawPixels(floorWidth, floorHeight, GL2.GL_RGBA, GL2.GL_UNSIGNED_BYTE, pixels);
       
    }
   
    private void renderShadowsToTexture(GL2 gl) {
        gl.glGenTextures(1, textureID, 0);
        gl.glBindTexture(GL2.GL_TEXTURE_2D, textureID[0]);
       
        gl.glTexParameteri(GL2.GL_TEXTURE_2D, GL2.GL_TEXTURE_MIN_FILTER, GL2.GL_NEAREST);
        gl.glTexParameteri(GL2.GL_TEXTURE_2D, GL2.GL_TEXTURE_MAG_FILTER, GL2.GL_NEAREST);
       
        // null means reserve texture memory, but texels are undefined
       gl.glTexImage2D(GL2.GL_TEXTURE_2D, 0, GL2.GL_RGB, floorWidth, floorHeight,
                                                    0, GL2.GL_RGB, GL2.GL_FLOAT, null);
       
        gl.glGenFramebuffers(1, frameBufferID, 0);
        gl.glBindFramebuffer(GL2.GL_FRAMEBUFFER, frameBufferID[0]);
       
        //Attach 2D texture to this FBO
       gl.glFramebufferTexture2D(GL2.GL_FRAMEBUFFER, GL2.GL_COLOR_ATTACHMENT0,
                                        GL2.GL_TEXTURE_2D, textureID[0], 0);
       
        // depth buffer
       gl.glGenRenderbuffers(1, depthRenderBufferID, 0);
        gl.glBindRenderbuffer(GL2.GL_RENDERBUFFER, depthRenderBufferID[0]);
        gl.glRenderbufferStorage(GL2.GL_RENDERBUFFER, GL2.GL_DEPTH_COMPONENT,
                                                floorWidth, floorHeight);
        gl.glFramebufferRenderbuffer(GL2.GL_FRAMEBUFFER, GL2.GL_DEPTH_ATTACHMENT,
                                            GL2.GL_RENDERBUFFER, depthRenderBufferID[0]);
       
        if(gl.glCheckFramebufferStatus(GL2.GL_FRAMEBUFFER) == GL2.GL_FRAMEBUFFER_COMPLETE)
            System.out.println("[Viewer] GL_FRAMEBUFFER_COMPLETE!!");
        else
            System.out.println("..cazzo ^^");
       
        gl.glMatrixMode(GL2.GL_MODELVIEW);
        gl.glPushMatrix();
        gl.glLoadIdentity();
       
        gl.glClearColor(0.9f, 0.9f, 0.9f, 1.0f);
        gl.glClear(GL2.GL_COLOR_BUFFER_BIT);
       
        gl.glPointSize(10.0f);
        gl.glBegin(GL2.GL_POINTS);
            gl.glColor3f(0.0f, 1.0f, 0.0f);
            gl.glVertex2d(1.0f, 1.0f);      // THIS IS NOT SHOWN
           gl.glColor3f(0.0f, 0.0f, 1.0f);
            gl.glVertex2d(-1.0f, -1.0f);
            gl.glVertex2d(-0.9f, -0.9f);
        gl.glEnd();
       
        gl.glPopMatrix();

        pixels = GLBuffers.newDirectByteBuffer(floorWidth*floorHeight*4);

        gl.glReadPixels(0, 0, floorWidth, floorHeight, GL2.GL_RGBA,
                                                    GL2.GL_UNSIGNED_BYTE, pixels);
                                                   
                                                   
        System.out.println("glIsTexture: "+gl.glIsTexture(textureID[0]));
       
        //  bind the back buffer for rendering
       gl.glBindFramebuffer(GL2.GL_FRAMEBUFFER, 0);
    }

    public void dispose(GLAutoDrawable glad) {
//        throw new UnsupportedOperationException("Not supported yet.");
       System.out.println("dispose");
    }

}


Starting from the left, the triangle and the first quad are rendered normally using the <i>display()</i> while the last quad on the right and the one below are respectively the quad rendered with the texture mapped on it and the quad showing what is inside the texture itself

Basically I do not see the red point, only the blue ones



Why?
Offline elect

Junior Member





« Reply #1 - Posted 2012-02-20 15:35:50 »

Solved:

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gl.glPushAttrib(GL2.GL_VIEWPORT_BIT); 
gl.glViewport(0, 0, floorWidth, floorHeight);

...

gl.glPopAttrib();
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