Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import android.util.Log;

import static android.opengl.GLES20.GL_LINK_STATUS;

import static android.opengl.GLES20.glAttachShader;

import static android.opengl.GLES20.glCreateProgram;

import static android.opengl.GLES20.glDeleteProgram;

import static android.opengl.GLES20.glGetProgramInfoLog;
import static android.opengl.GLES20.glGetProgramiv;

import static android.opengl.GLES20.glLinkProgram;

public class Main {
    private static final String TAG = "ShaderHelper";
    private static final boolean IS_LOGGING_ON = true;

    /**
     * Links a vertex shader and a fragment shader together into an OpenGL
     * program. Returns the OpenGL program object ID, or 0 if linking failed.
     */
    public static int linkProgram(int vertexShaderId, int fragmentShaderId) {

        // Create a new program object.
        final int programObjectId = glCreateProgram();

        if (programObjectId == 0) {
            if (IS_LOGGING_ON) {
                Log.w(TAG, "Could not create new program");
            }

            return 0;
        }

        // Attach the vertex shader to the program.
        glAttachShader(programObjectId, vertexShaderId);

        // Attach the fragment shader to the program.
        glAttachShader(programObjectId, fragmentShaderId);

        // Link the two shaders together into a program.
        glLinkProgram(programObjectId);

        // Get the link status.
        final int[] linkStatus = new int[1];
        glGetProgramiv(programObjectId, GL_LINK_STATUS, linkStatus, 0);

        if (IS_LOGGING_ON) {
            // Print the program info log to the Android log output.
            Log.v(TAG, "Results of linking program:\n" + glGetProgramInfoLog(programObjectId));
        }

        // Verify the link status.
        if (linkStatus[0] == 0) {
            // If it failed, delete the program object.
            glDeleteProgram(programObjectId);

            if (IS_LOGGING_ON) {
                Log.w(TAG, "Linking of program failed.");
            }

            return 0;
        }

        // Return the program object ID.
        return programObjectId;
    }
}