I'm trying to use glCopyTexImage2D to copy a portion of my sketch to a texture. However, I can seem to get it to do anything! I've been over the documentation many times, and I've spent a few fruitless hours googling, with no luck.
Before someone suggests it, yes, I tried doing this with a FBO. It kind of worked, except there was weird tearing all over the middle of the copied portion, such that nothing but black would show up except stuff near the edges.
Since it might be a machine issue, I'm using a C2D MBP with a Radeon X1600 graphics card, running OS X 10.5.7.
Quote:import processing.opengl.*;
import javax.media.opengl.*;
import com.sun.opengl.util.texture.*;
GL gl;
int[] tex = { 0 };
int texSize = 512;
int quadlist;
void setup() {
size(1024, 768, OPENGL);
frameRate(30.0);
setupGL();
}
void draw() {
background(255);
gl = ((PGraphicsOpenGL)g).beginGL();
gl.glDisable(GL.GL_DEPTH_TEST);
gl.glClear(GL.GL_COLOR_BUFFER_BIT);
// move to center & rotate
gl.glPushMatrix();
gl.glTranslatef(width/2.0, height/2.0, 0.0);
gl.glRotatef(frameCount, 0.0, 0.0, 1.0);
gl.glScalef(512.0/texSize, 512.0/texSize, 1.0);
// draw the outline of the rect
gl.glColor4f(0.0, 0.0, 0.0, 1.0);
int lw = 4;
gl.glLineWidth(lw);
glLine(-(texSize/2 - 10 + lw), -(texSize/2 - 10 + lw), (texSize/2 - 10 + lw), -(texSize/2 - 10 + lw));
glLine((texSize/2 - 10 + lw), -(texSize/2 - 10 + lw), (texSize/2 - 10 + lw), (texSize/2 - 10 + lw));
glLine((texSize/2 - 10 + lw), (texSize/2 - 10 + lw), -(texSize/2 - 10 + lw), (texSize/2 - 10 + lw));
glLine(-(texSize/2 - 10 + lw), (texSize/2 - 10 + lw), -(texSize/2 - 10 + lw), -(texSize/2 - 10 + lw));
gl.glPopMatrix();
// bind texture
gl.glEnable(GL.GL_TEXTURE_2D);
gl.glBindTexture(GL.GL_TEXTURE_2D, tex[0]);
// copy the screen into the texture
gl.glCopyTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGB,
0, 0, 512, 512, 0);
gl.glBindTexture(GL.GL_TEXTURE_2D, 0);
// draw the texture
gl.glBindTexture(GL.GL_TEXTURE_2D, tex[0]);
gl.glTranslatef(50.0, 50.0, 0.0);
gl.glScalef(100.0, 100.0, 1.0);
gl.glCallList(quadlist);
((PGraphicsOpenGL)g).endGL();
}
void setupGL() {
gl = ((PGraphicsOpenGL)g).gl;
// set the swap interval to eliminate screen tearing
gl.setSwapInterval(1);
quadlist = gl.glGenLists(1);
gl.glNewList(quadlist, GL.GL_COMPILE);
gl.glBegin(GL.GL_QUADS);
gl.glTexCoord2f(0.0f, 0.0f); gl.glVertex2f(-0.5f, -0.5f);
gl.glTexCoord2f(1.0f, 0.0f); gl.glVertex2f( 0.5f, -0.5f);
gl.glTexCoord2f(1.0f, 1.0f); gl.glVertex2f( 0.5f, 0.5f);
gl.glTexCoord2f(0.0f, 1.0f); gl.glVertex2f(-0.5f, 0.5f);
gl.glEnd();
gl.glEndList();
gl.glGenTextures(1, tex, 0);
gl.glBindTexture(GL.GL_TEXTURE_2D, tex[0]);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MIN_FILTER, GL.GL_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_MAG_FILTER, GL.GL_LINEAR);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_S, GL.GL_CLAMP);
gl.glTexParameteri(GL.GL_TEXTURE_2D, GL.GL_TEXTURE_WRAP_T, GL.GL_CLAMP);
gl.glTexImage2D(GL.GL_TEXTURE_2D, 0, GL.GL_RGB,
texSize, texSize, 0, GL.GL_RGB, GL.GL_UNSIGNED_BYTE, null);
gl.glClearColor(1.0, 1.0, 1.0, 1.0);
}
void glLine(float x1, float y1, float x2, float y2) {
gl.glBegin(GL.GL_LINES);
gl.glVertex2f(x1, y1);
gl.glVertex2f(x2, y2);
gl.glEnd();
}
Can anyone figure out why this isn't working?
Pages: 1
CopyTexImage2D Doesn't Seem to Work (Read 869 times)