com.xrbpowered.gl.res.shaders.PostProcessRenderer.java Source code

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Here is the source code for com.xrbpowered.gl.res.shaders.PostProcessRenderer.java

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/*******************************************************************************
 * MIT License
 *
 * Copyright (c) 2016 Ashur Rafiev
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *******************************************************************************/
package com.xrbpowered.gl.res.shaders;

import java.awt.Color;

import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;

import com.xrbpowered.gl.Renderer;
import com.xrbpowered.gl.res.buffers.OffscreenBuffers;
import com.xrbpowered.gl.res.buffers.RenderTarget;

public class PostProcessRenderer implements Renderer {

    public final Renderer parent;
    public final PostProcessShader postProc;

    private boolean requestUpdate = true;
    private boolean updatePerFrame;

    protected Color clearColor = Color.BLACK;
    protected OffscreenBuffers bgBuffer = null;
    protected RenderTarget interBuffer = null;
    protected RenderTarget largeBuffer = null;

    public PostProcessRenderer(Renderer parent, PostProcessShader shader, boolean updatePerFrame) {
        this.parent = parent;
        this.postProc = shader;
        this.updatePerFrame = updatePerFrame;
        resizeBuffers();
    }

    protected void destroyBuffers() {
        if (bgBuffer != null) {
            bgBuffer.destroy();
            bgBuffer = null;
        }
        if (interBuffer != null) {
            interBuffer.destroy();
            interBuffer = null;
        }
        if (largeBuffer != null) {
            largeBuffer.destroy();
            largeBuffer = null;
        }
    }

    protected void resizeBuffers(int bgWidth, int bgHeight, int interWidth, int interHeight) {
        destroyBuffers();
        bgBuffer = new OffscreenBuffers(bgWidth, bgHeight, true);
        if (postProc != null)
            interBuffer = new OffscreenBuffers(interWidth, interHeight, false);
    }

    public void resizeBuffers() {
        int w = Display.getWidth();
        int h = Display.getHeight();
        resizeBuffers(w, h, w, h);
    }

    public void requestUpdate() {
        requestUpdate = true;
        //      redrawBackgroundBuffer();
    }

    public void setUpdatePerFrame(boolean updatePerFrame) {
        this.updatePerFrame = updatePerFrame;
    }

    protected void redrawBackgroundBuffer() {
        if (bgBuffer == null)
            return;
        bgBuffer.use();
        parent.redraw(bgBuffer);
        requestUpdate = false;
    }

    private void blit(RenderTarget src, RenderTarget target) {
        if (target.isMultisample()) {
            if (largeBuffer != null && (largeBuffer.getWidth() != target.getWidth()
                    || largeBuffer.getHeight() != target.getHeight())) {
                largeBuffer.destroy();
                largeBuffer = null;
            }
            if (largeBuffer == null) {
                largeBuffer = new OffscreenBuffers(target.getWidth(), target.getHeight(), false);
            }
            OffscreenBuffers.blit(src, largeBuffer, true);
            OffscreenBuffers.blit(largeBuffer, target, false);
        } else {
            OffscreenBuffers.blit(src, target, true);
        }
    }

    @Override
    public void updateTime(float dt) {
        if (postProc != null)
            postProc.updateTime(dt);
    }

    @Override
    public void redraw(RenderTarget target) {
        if (requestUpdate || updatePerFrame) {
            redrawBackgroundBuffer(); //updatePerFrame ? dt : 0f);
        }

        if (bgBuffer != null) {
            if (postProc == null)
                blit(bgBuffer, target);
            else {
                GL11.glDisable(GL11.GL_CULL_FACE);
                interBuffer.use();
                postProc.draw(bgBuffer);
                blit(interBuffer, target);
            }
            target.use();
        } else {
            target.use();
            GL11.glClearColor(clearColor.getRed() / 255f, clearColor.getGreen() / 255f, clearColor.getBlue() / 255f,
                    0f);
            GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT);
        }
    }

}