package com.example.datalibrary.lim;
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import android.content.res.Resources;
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import android.opengl.GLES20;
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import android.util.Log;
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import java.io.ByteArrayOutputStream;
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import java.io.InputStream;
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public class ShaderUtil {
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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("ES20_ERROR", "Could not compile shader " + shaderType
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+ ":");
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Log.e("ES20_ERROR", 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 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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checkGlError("glAttachShader");
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GLES20.glAttachShader(program, pixelShader);
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checkGlError("glAttachShader");
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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("ES20_ERROR", "Could not link program: ");
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Log.e("ES20_ERROR", 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 void checkGlError(String op) {
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int error;
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while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {
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Log.e("ES20_ERROR", op + ": glError " + error);
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// throw new RuntimeException(op + ": glError " + error);
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}
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}
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public static String loadFromAssetsFile(String fname, Resources r) {
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String result = null;
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try {
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InputStream in = r.getAssets().open(fname);
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int ch = 0;
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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while ((ch = in.read()) != -1) {
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baos.write(ch);
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}
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byte[] buff = baos.toByteArray();
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baos.close();
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in.close();
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result = new String(buff, "UTF-8");
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result = result.replaceAll("\\r\\n", "\n");
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} catch (Exception e) {
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e.printStackTrace();
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}
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return result;
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}
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}
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