org.jogamp.glg2d.impl.shader.GL2ES2ImagePipeline.java Source code

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Here is the source code for org.jogamp.glg2d.impl.shader.GL2ES2ImagePipeline.java

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/*
 * Copyright 2013 Brandon Borkholder
 *
 * 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 org.jogamp.glg2d.impl.shader;

import static org.jogamp.glg2d.GLG2DUtils.ensureIsGLBuffer;

import java.nio.FloatBuffer;

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

public class GL2ES2ImagePipeline extends AbstractShaderPipeline {
    protected int vertexBufferId = -1;

    protected int textureLocation = -1;
    protected int vertCoordLocation = -1;
    protected int texCoordLocation = -1;

    public GL2ES2ImagePipeline() {
        this("TextureShader.v", "TextureShader.f");
    }

    public GL2ES2ImagePipeline(String vertexShaderFileName, String fragmentShaderFileName) {
        super(vertexShaderFileName, null, fragmentShaderFileName);
    }

    public void setTextureUnit(int unit) {
        if (textureLocation >= 0) {
            GL20.glUniform1i(textureLocation, unit);
        }
    }

    protected void bufferData(FloatBuffer buffer) {
        vertexBufferId = ensureIsGLBuffer(vertexBufferId);

        GL20.glEnableVertexAttribArray(vertCoordLocation);
        GL20.glEnableVertexAttribArray(texCoordLocation);

        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, vertexBufferId);
        GL15.glBufferData(GL15.GL_ARRAY_BUFFER, buffer, GL15.GL_STATIC_DRAW);

        GL20.glVertexAttribPointer(vertCoordLocation, 2, GL11.GL_FLOAT, false, 4 * (Float.SIZE / Byte.SIZE), 0);
        GL20.glVertexAttribPointer(texCoordLocation, 2, GL11.GL_FLOAT, false, 4 * (Float.SIZE / Byte.SIZE),
                2 * (Float.SIZE / Byte.SIZE));
    }

    public void draw(FloatBuffer interleavedVertTexBuffer) {
        bufferData(interleavedVertTexBuffer);

        GL11.glDrawArrays(GL11.GL_TRIANGLE_STRIP, 0, 4);

        GL20.glDisableVertexAttribArray(vertCoordLocation);
        GL20.glDisableVertexAttribArray(texCoordLocation);
        GL15.glBindBuffer(GL15.GL_ARRAY_BUFFER, 0);
    }

    @Override
    protected void setupUniformsAndAttributes() {
        super.setupUniformsAndAttributes();

        transformLocation = GL20.glGetUniformLocation(programId, "u_transform");
        colorLocation = GL20.glGetUniformLocation(programId, "u_color");
        textureLocation = GL20.glGetUniformLocation(programId, "u_tex");

        vertCoordLocation = GL20.glGetAttribLocation(programId, "a_vertCoord");
        texCoordLocation = GL20.glGetAttribLocation(programId, "a_texCoord");
    }

    @Override
    public void delete() {
        super.delete();

        if (GL15.glIsBuffer(vertexBufferId)) {
            GL15.glDeleteBuffers(vertexBufferId);
        }
    }
}