zildo.fwk.gfx.filter.BlurFilter.java Source code

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Here is the source code for zildo.fwk.gfx.filter.BlurFilter.java

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/**
 * Legend of Zildo
 * Copyright (C) 2006-2011 Evariste Boussaton
 * Based on original Zelda : link to the past (C) Nintendo 1992
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package zildo.fwk.gfx.filter;

import org.lwjgl.opengl.GL11;

import zildo.client.ClientEngineZildo;

public class BlurFilter extends ZoomFilter {

    final int nImages = 10;
    final float startCoeff = 0.3f;
    final float incCoeff = 0.1f;
    int texBuffer[];
    int currentImage;
    int nImagesSaved;

    public BlurFilter() {
        super();
        texBuffer = new int[nImages];
        texBuffer[0] = textureID;
        for (int i = 1; i < nImages; i++) {
            texBuffer[i] = generateTexture(sizeX, sizeY);
        }
        currentImage = 0;
    }

    @Override
    public boolean renderFilter() {

        boolean result = true;

        fbo.endRendering();

        // Get on top of screen and disable blending
        GL11.glMatrixMode(GL11.GL_MODELVIEW);
        GL11.glLoadIdentity();
        GL11.glMatrixMode(GL11.GL_PROJECTION);
        GL11.glPushMatrix();
        GL11.glTranslatef(0, -sizeY, 0);

        //GL11.glDisable(GL11.GL_BLEND);

        if (nImagesSaved < nImages) {
            // All images are not stored yet. So we just display the current one.
            nImagesSaved++;
            GL11.glBindTexture(GL11.GL_TEXTURE_2D, texBuffer[currentImage]);
            super.render();
            result = false;
        } else {
            super.focusOnZildo();

            // Draw each image, with intensified colors
            for (int i = 0; i < nImages; i++) {
                float coeff = startCoeff + i * (incCoeff / nImages);
                GL11.glColor4f(coeff, coeff, coeff, 1.0f);
                GL11.glBindTexture(GL11.GL_TEXTURE_2D, texBuffer[(i + currentImage + 1) % nImages]);
                super.render();
                if (i == 0) {
                    // Enable blend from second one
                    GL11.glEnable(GL11.GL_BLEND);
                    GL11.glBlendFunc(GL11.GL_SRC_COLOR, GL11.GL_ONE); //_MINUS_SRC_ALPHA);
                }
            }

        }

        GL11.glPopMatrix();

        GL11.glMatrixMode(GL11.GL_MODELVIEW);
        GL11.glDisable(GL11.GL_BLEND);

        // Switch
        currentImage = (currentImage + 1) % nImages;

        return result;
    }

    @Override
    public void preFilter() {
        // Copy last texture in TexBuffer
        fbo.bindToTextureAndDepth(texBuffer[currentImage], depthTextureID, fboId);
        fbo.startRendering(fboId, sizeX, sizeY);
        GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); // Clear The Screen And The Depth Buffer
    }

    /**
     * Re-initialize z coordinate
     */
    @Override
    public void doOnInactive(FilterEffect effect) {
        ClientEngineZildo.openGLGestion.setZ(0);
        GL11.glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
        nImagesSaved = 0;
        currentImage = 0;
    }

}