com.google.gapid.glviewer.gl.Util.java Source code

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Here is the source code for com.google.gapid.glviewer.gl.Util.java

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/*
 * Copyright (C) 2017 Google Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.google.gapid.glviewer.gl;

import static org.lwjgl.BufferUtils.createIntBuffer;

import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.GL15;
import org.lwjgl.opengl.GL20;

import java.nio.IntBuffer;

public class Util {
    private Util() {
    }

    public static int createBuffer() {
        return GL15.glGenBuffers();
    }

    public static int createTexture() {
        return GL11.glGenTextures();
    }

    public static int getShaderiv(int shader, int name) {
        return GL20.glGetShaderi(shader, name);
    }

    public static int getProgramiv(int program, int name) {
        return GL20.glGetProgrami(program, name);
    }

    public static String getShaderInfoLog(int shader) {
        return GL20.glGetShaderInfoLog(shader);
    }

    public static String getProgramInfoLog(int program) {
        return GL20.glGetProgramInfoLog(program);
    }

    public static int[] getAttachedShaders(int program) {
        int numShaders = getProgramiv(program, GL20.GL_ATTACHED_SHADERS);
        if (numShaders > 0) {
            int[] shaders = new int[numShaders], count = new int[1];
            GL20.glGetAttachedShaders(program, count, shaders);
            return shaders;
        }
        return new int[0];
    }

    public static AttributeOrUniform[] getActiveAttributes(int program) {
        int maxAttribNameLength = getProgramiv(program, GL20.GL_ACTIVE_ATTRIBUTE_MAX_LENGTH);
        int numAttributes = getProgramiv(program, GL20.GL_ACTIVE_ATTRIBUTES);
        IntBuffer size = createIntBuffer(1), type = createIntBuffer(1);

        AttributeOrUniform[] result = new AttributeOrUniform[numAttributes];
        for (int i = 0; i < numAttributes; i++) {
            String name = GL20.glGetActiveAttrib(program, i, maxAttribNameLength, size, type);
            result[i] = new AttributeOrUniform(GL20.glGetAttribLocation(program, name), name, type.get(0),
                    size.get(0));
        }
        return result;
    }

    public static AttributeOrUniform[] getActiveUniforms(int program) {
        int maxUniformNameLength = getProgramiv(program, GL20.GL_ACTIVE_UNIFORM_MAX_LENGTH);
        int numUniforms = getProgramiv(program, GL20.GL_ACTIVE_UNIFORMS);
        IntBuffer size = createIntBuffer(1), type = createIntBuffer(1);

        AttributeOrUniform[] result = new AttributeOrUniform[numUniforms];
        for (int i = 0; i < numUniforms; i++) {
            String name = GL20.glGetActiveUniform(program, i, maxUniformNameLength, size, type);
            if (name.endsWith("[0]")) {
                name = name.substring(0, name.length() - 3);
            }
            result[i] = new AttributeOrUniform(GL20.glGetUniformLocation(program, name), name, type.get(0),
                    size.get(0));
        }
        return result;
    }

    public static class AttributeOrUniform {
        public final int location;
        public final String name;
        public final int type;
        public final int size;

        public AttributeOrUniform(int location, String name, int type, int size) {
            this.location = location;
            this.name = name;
            this.type = type;
            this.size = size;
        }
    }
}