Utility method for compiling a OpenGL shader. - Android android.opengl

Android examples for android.opengl:OpenGL Shader

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Description

Utility method for compiling a OpenGL shader.

Demo Code


//package com.java2s;

import android.opengl.GLES20;
import android.util.Log;

public class Main {
    private static final String TAG = "GameManiaGLUtil";

    /**// w w  w. j  a  v  a  2 s .co m
     * Utility method for compiling a OpenGL shader.
     * <p/>
     * <p><strong>Note:</strong> When developing shaders, use the checkGlError()
     * method to debug shader coding errors.</p>
     *
     * @param type       - Vertex or fragment shader type.
     * @param shaderCode - String containing the shader code.
     * @return - Returns an id for the shader.
     */
    public static int loadShader(int type, String shaderCode) {

        // create a vertex shader type (GLES20.GL_VERTEX_SHADER)
        // or a fragment shader type (GLES20.GL_FRAGMENT_SHADER)
        int shaderHandle = GLES20.glCreateShader(type);

        // add the source code to the shader and compile it
        GLES20.glShaderSource(shaderHandle, shaderCode);
        GLES20.glCompileShader(shaderHandle);

        // Get the compilation status.
        final int[] compileStatus = new int[1];
        GLES20.glGetShaderiv(shaderHandle, GLES20.GL_COMPILE_STATUS,
                compileStatus, 0);

        // If the compilation failed, delete the shader.
        if (compileStatus[0] == 0) {
            Log.e(TAG,
                    "Error compiling shader: "
                            + GLES20.glGetShaderInfoLog(shaderHandle));
            GLES20.glDeleteShader(shaderHandle);
            shaderHandle = 0;
        }

        return shaderHandle;
    }
}

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