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

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Here is the source code for com.xrbpowered.gl.res.shaders.Shader.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.io.IOException;
import java.nio.FloatBuffer;

import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL20;
import org.lwjgl.util.vector.Matrix3f;
import org.lwjgl.util.vector.Matrix4f;
import org.lwjgl.util.vector.Vector2f;
import org.lwjgl.util.vector.Vector3f;
import org.lwjgl.util.vector.Vector4f;

import com.xrbpowered.gl.Client;
import com.xrbpowered.utils.assets.AssetManager;

public abstract class Shader {

    public final VertexInfo info;
    protected int pId;

    protected Shader(VertexInfo info) {
        this.info = info;
    }

    public Shader(VertexInfo info, String pathVS, String pathFS) {
        //      System.out.println("Compile: "+pathVS+", "+pathFS);
        this.info = info;
        int vsId = loadShader(pathVS, GL20.GL_VERTEX_SHADER);
        int fsId = loadShader(pathFS, GL20.GL_FRAGMENT_SHADER);

        pId = GL20.glCreateProgram();
        if (vsId > 0)
            GL20.glAttachShader(pId, vsId);
        if (fsId > 0)
            GL20.glAttachShader(pId, fsId);

        bindAttribLocations();

        //      System.out.println("Link: "+pathVS+", "+pathFS);
        GL20.glLinkProgram(pId);
        if (GL20.glGetProgrami(pId, GL20.GL_LINK_STATUS) == GL11.GL_FALSE) {
            System.err.println("Could not link program " + pathVS + ", " + pathFS);
            System.err.println(GL20.glGetProgramInfoLog(pId, 8000));
            System.exit(-1);
        }
        GL20.glValidateProgram(pId);

        storeUniformLocations();
        Client.checkError();
        //      System.out.println("Done: "+pathVS+", "+pathFS+"\n");
    }

    protected abstract void storeUniformLocations();

    public abstract void updateUniforms();

    public int getProgramId() {
        return pId;
    }

    public void use() {
        GL20.glUseProgram(pId);
        updateUniforms();
    }

    public void unuse() {
        GL20.glUseProgram(0);
    }

    public void destroy() {
        GL20.glUseProgram(0);
        GL20.glDeleteProgram(pId);
    }

    protected int bindAttribLocations() {
        return (info == null) ? 0 : info.bindAttribLocations(pId);
    }

    protected void initSamplers(String[] names) {
        GL20.glUseProgram(pId);
        for (int i = 0; i < names.length; i++) {
            GL20.glUniform1i(GL20.glGetUniformLocation(pId, names[i]), i);
        }
        GL20.glUseProgram(0);
    }

    public static int loadShader(String path, int type) {
        if (path == null)
            return 0;
        int shaderId = 0;
        String shaderSource;
        try {
            shaderSource = AssetManager.defaultAssets.loadString(path);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }

        shaderId = GL20.glCreateShader(type);
        GL20.glShaderSource(shaderId, shaderSource);
        GL20.glCompileShader(shaderId);

        if (GL20.glGetShaderi(shaderId, GL20.GL_COMPILE_STATUS) == GL11.GL_FALSE) {
            System.err.println("Could not compile shader " + path);
            System.err.println(GL20.glGetShaderInfoLog(shaderId, 8000));
            System.exit(-1); // FIXME handle this exception!!
        }

        return shaderId;
    }

    private static final FloatBuffer matrix4Buffer = BufferUtils.createFloatBuffer(16);

    protected static void uniform(int location, Matrix4f matrix) {
        matrix.store(matrix4Buffer);
        matrix4Buffer.flip();
        GL20.glUniformMatrix4(location, false, matrix4Buffer);
    }

    private static final FloatBuffer matrix3Buffer = BufferUtils.createFloatBuffer(9);

    protected static void uniform(int location, Matrix3f matrix) {
        matrix.store(matrix3Buffer);
        matrix3Buffer.flip();
        GL20.glUniformMatrix3(location, false, matrix3Buffer);
    }

    private static final FloatBuffer vec4Buffer = BufferUtils.createFloatBuffer(4);

    protected static void uniform(int location, Vector4f v) {
        v.store(vec4Buffer);
        vec4Buffer.flip();
        GL20.glUniform4(location, vec4Buffer);
    }

    private static final FloatBuffer vec3Buffer = BufferUtils.createFloatBuffer(3);

    protected static void uniform(int location, Vector3f v) {
        v.store(vec3Buffer);
        vec3Buffer.flip();
        GL20.glUniform3(location, vec3Buffer);
    }

    private static final FloatBuffer vec2Buffer = BufferUtils.createFloatBuffer(2);

    protected static void uniform(int location, Vector2f v) {
        v.store(vec2Buffer);
        vec2Buffer.flip();
        GL20.glUniform2(location, vec2Buffer);
    }

}