Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
import android.opengl.GLES20;
import android.util.Log;

public class Main {
    private static final String LOGTAG = "SampleUtils";

    public static int createProgramFromShaderSrc(String vertexShaderSrc, String fragmentShaderSrc) {
        int vertShader = initShader(GLES20.GL_VERTEX_SHADER, vertexShaderSrc);
        int fragShader = initShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderSrc);

        if (vertShader == 0 || fragShader == 0)
            return 0;

        int program = GLES20.glCreateProgram();
        if (program != 0) {
            GLES20.glAttachShader(program, vertShader);
            checkGLError("glAttchShader(vert)");

            GLES20.glAttachShader(program, fragShader);
            checkGLError("glAttchShader(frag)");

            GLES20.glLinkProgram(program);
            int[] glStatusVar = { GLES20.GL_FALSE };
            GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, glStatusVar, 0);
            if (glStatusVar[0] == GLES20.GL_FALSE) {
                Log.e(LOGTAG, "Could NOT link program : " + GLES20.glGetProgramInfoLog(program));
                GLES20.glDeleteProgram(program);
                program = 0;
            }
        }

        return program;
    }

    static int initShader(int shaderType, String source) {
        int shader = GLES20.glCreateShader(shaderType);
        if (shader != 0) {
            GLES20.glShaderSource(shader, source);
            GLES20.glCompileShader(shader);

            int[] glStatusVar = { GLES20.GL_FALSE };
            GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, glStatusVar, 0);
            if (glStatusVar[0] == GLES20.GL_FALSE) {
                Log.e(LOGTAG, "Could NOT compile shader " + shaderType + " : " + GLES20.glGetShaderInfoLog(shader));
                GLES20.glDeleteShader(shader);
                shader = 0;
            }

        }

        return shader;
    }

    public static void checkGLError(String op) {
        for (int error = GLES20.glGetError(); error != 0; error = GLES20.glGetError())
            Log.e(LOGTAG, "After operation " + op + " got glError 0x" + Integer.toHexString(error));
    }
}