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

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Here is the source code for com.xrbpowered.gl.res.shaders.PostProcessShader.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 org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL20;

import com.xrbpowered.gl.res.StaticMesh;
import com.xrbpowered.gl.res.buffers.OffscreenBuffers;
import com.xrbpowered.gl.res.textures.Texture;
import com.xrbpowered.gl.ui.UIManager;

public class PostProcessShader extends Shader {

    private static StaticMesh quad = null;

    private float time = 0f;
    private int timeLocation;

    public PostProcessShader(String shaderPath) {
        super(UIManager.uiVertexInfo, "scrn_v.glsl", shaderPath);
    }

    @Override
    protected void storeUniformLocations() {
        timeLocation = GL20.glGetUniformLocation(pId, "time");
        GL20.glUseProgram(pId);
        GL20.glUniform1i(GL20.glGetUniformLocation(pId, "colorBuf"), 0);
        GL20.glUseProgram(0);
    }

    @Override
    public void updateUniforms() {
        GL20.glUniform1f(timeLocation, time);
    }

    public void updateTime(float dt) {
        time += dt;
    }

    public void draw(OffscreenBuffers src) {
        GL11.glDisable(GL11.GL_DEPTH_TEST);
        GL11.glDepthMask(false);
        createQuad();

        use();
        if (src != null)
            src.bindColorBuffer(0);
        quad.draw();
        Texture.unbind(0);
        unuse();

        GL11.glEnable(GL11.GL_DEPTH_TEST);
        GL11.glDepthMask(true);
    }

    public void destroy() {
        super.destroy();
        if (quad != null) {
            quad.destroy();
            quad = null;
        }
    }

    private static void createQuad() {
        if (quad == null) {
            quad = new StaticMesh(UIManager.uiVertexInfo,
                    new float[] { -1, -1, 0, 0, 1, -1, 1, 0, 1, 1, 1, 1, -1, 1, 0, 1 },
                    new short[] { 0, 3, 2, 2, 1, 0 });
        }
    }
}