基本的にテクスチャにレンダリングすると、テクスチャの一部が失われたように見えます。
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");
}
}
左から順に、三角形と最初のクワッドは通常どおりにレンダリングされますがdisplay()、右側の最後のクワッドと下のクワッドはそれぞれ、テクスチャがマッピングされた状態でレンダリングされたクワッドと、テクスチャ自体の内部を示すクワッドです。
基本的に赤い点は見えず、青い点だけが見えます。なんで？
