package com.example.datalibrary.gl.utils;
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import android.content.Context;
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import android.opengl.GLES20;
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import android.util.Log;
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import java.io.BufferedReader;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.InputStreamReader;
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public class ShaderUtils {
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private static final String TAG = "ShaderUtils";
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public static boolean checkGlError(String label) {
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int error;
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boolean err = true;
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while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
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Log.e(TAG, label + ": glError " + error);
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err = false;
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}
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return err;
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}
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public static int createProgram(String vertexSource, String fragmentSource) {
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int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSource);
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if (vertexShader == 0) {
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return 0;
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}
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int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSource);
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if (pixelShader == 0) {
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return 0;
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}
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int program = GLES20.glCreateProgram();
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if (program != 0) {
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GLES20.glAttachShader(program, vertexShader);
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if (!checkGlError("glAttachShader")){
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return 0;
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}
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GLES20.glAttachShader(program, pixelShader);
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if (!checkGlError("glAttachShader")){
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return 0;
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}
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GLES20.glLinkProgram(program);
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int[] linkStatus = new int[1];
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GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);
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if (linkStatus[0] != GLES20.GL_TRUE) {
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Log.e(TAG, "Could not link program: ");
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Log.e(TAG, GLES20.glGetProgramInfoLog(program));
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GLES20.glDeleteProgram(program);
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program = 0;
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}
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}
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return program;
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}
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public static int loadShader(int shaderType, String source) {
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int shader = GLES20.glCreateShader(shaderType);
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if (shader != 0) {
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GLES20.glShaderSource(shader, source);
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GLES20.glCompileShader(shader);
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int[] compiled = new int[1];
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GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);
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if (compiled[0] == 0) {
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Log.e(TAG, "Could not compile shader " + shaderType + ":");
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Log.e(TAG, GLES20.glGetShaderInfoLog(shader));
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GLES20.glDeleteShader(shader);
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shader = 0;
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}
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}
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return shader;
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}
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public static String readRawTextFile(Context context, int resId) {
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InputStream inputStream = context.getResources().openRawResource(resId);
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try {
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BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
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StringBuilder sb = new StringBuilder();
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String line;
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while ((line = reader.readLine()) != null) {
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sb.append(line).append("\n");
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}
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reader.close();
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return sb.toString();
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} catch (IOException e) {
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e.printStackTrace();
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}
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return null;
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}
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}
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