/**
* Puts the input texture through the Program chain, returning the processed output Texture which
* can then be placed on a Geom, etc.
*
* @param gl
* @return A Texture that's been processed by the attached shader Programs
*/
public Texture apply() {
GL2 gl = getGL();
// sanity check
if (programs.size() == 0) {
return inputTexture;
}
// if first time, generate FBO
if (fboId < 0) {
System.out.println("GENERATE...");
if (!generateFBO(gl)) {
System.err.println("couldn't generate FBO!");
return null;
}
}
// if first time, install shaders
for (Program program : this.programs) {
if (program.programId <= 0) {
program.install();
}
}
writeAttachment = GL_COLOR_ATTACHMENT0;
readAttachment = GL_COLOR_ATTACHMENT1;
readTextureId = texture2.getTextureObject();
writeTextureId = texture1.getTextureObject();
// readTexture = texture2;
// writeTexture = texture1;
// bind fbo
gl.glBindFramebuffer(GL_FRAMEBUFFER, fboId);
gl.glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
gl.glViewport(0, 0, fboWidth, fboHeight);
// use first program to process inputTexture into texture2
drawTextureToOffScreenTextureUsingShader(
inputTexture.getTextureObject(), writeAttachment, programs.get(0));
swapPingPong(); // make the write texture our new *read* texture
// loop through the rest of our shaders
for (int i = 1; i < programs.size(); i++) {
drawTextureToOffScreenTextureUsingShader(readTextureId, writeAttachment, programs.get(i));
swapPingPong();
}
gl.glBindFramebuffer(GL_FRAMEBUFFER, 0);
int www = RenderUtils.getViewport()[2];
int hhh = RenderUtils.getViewport()[3];
gl.glViewport(0, 0, www, hhh);
if (readTextureId == texture1.getTextureObject()) {
return texture1;
} else {
return texture2;
}
}
public void drawTextureToOffScreenTextureUsingShader(int texId, int attachment, Program program)
// public void drawTextureToOffScreenTextureUsingShader(Texture tex, int attachment, Program
// program)
{
GL2 gl = getGL();
program.bind();
gl.glBindTexture(GL_TEXTURE_2D, texId);
// gl.glBindTexture(GL_TEXTURE_2D, tex.getTextureObject());
gl.glDrawBuffer(attachment);
gl.glEnable(GL_TEXTURE_2D);
// gl.glActiveTexture(GL_TEXTURE0);
gl.glClear(GL_DEPTH_BUFFER_BIT | GL_COLOR_BUFFER_BIT);
gl.glViewport(0, 0, fboWidth, fboHeight);
gl.glUniform1i(program.uniform("theTexture"), 0);
// set projection to ortho
gl.glMatrixMode(gl.GL_PROJECTION);
gl.glPushMatrix();
{
gl.glLoadIdentity();
Renderer.getInstance().glu.gluOrtho2D(0, fboWidth, fboHeight, 0);
gl.glMatrixMode(gl.GL_MODELVIEW);
gl.glPushMatrix();
{
gl.glLoadIdentity();
gl.glColor4f(1f, 1f, 1f, 1f);
drawSquare(gl, 0, 0, fboWidth, fboHeight);
}
gl.glPopMatrix();
gl.glMatrixMode(gl.GL_PROJECTION);
}
gl.glPopMatrix();
gl.glMatrixMode(gl.GL_MODELVIEW);
gl.glDisable(GL_TEXTURE_2D);
program.unbind();
}