/*
* Copyright (c) 2002-2008 LWJGL Project
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* modification, are permitted provided that the following conditions are
* met:
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* * Redistributions of source code must retain the above copyright
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*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* * Neither the name of 'LWJGL' nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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/*
* Created by LWJGL.
* User: spasi
* Date: 2004-03-30
* Time: 8:41:42 pm
*/
package org.lwjgl.test.opengl.shaders;
import org.lwjgl.BufferUtils;
import java.io.BufferedInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import static org.lwjgl.opengl.ARBProgram.*;
import static org.lwjgl.opengl.ARBShaderObjects.*;
import static org.lwjgl.opengl.GL11.*;
abstract class Shader {
protected static ByteBuffer fileBuffer = BufferUtils.createByteBuffer(1024 * 10);
protected Shader() {
}
abstract void render();
abstract void cleanup();
protected static String getShaderText(String file) {
String shader = null;
try {
InputStream source = ShadersTest.class.getResourceAsStream(file);
if ( source == null ) // dev-mode
source = new FileInputStream("src/java/org/lwjgl/test/opengl/shaders/" + file);
BufferedInputStream stream = new BufferedInputStream(source);
byte character;
while ( (character = (byte)stream.read()) != -1 )
fileBuffer.put(character);
stream.close();
fileBuffer.flip();
byte[] array = new byte[fileBuffer.remaining()];
fileBuffer.get(array);
shader = new String(array);
fileBuffer.clear();
} catch (IOException e) {
ShadersTest.kill("Failed to read the shader source file: " + file, e);
}
return shader;
}
protected static void checkProgramError(String programFile, String programSource) {
if ( glGetError() == GL_INVALID_OPERATION ) {
final int errorPos = glGetInteger(GL_PROGRAM_ERROR_POSITION_ARB);
int lineStart = 0;
int lineEnd = -1;
for ( int i = 0; i < programSource.length(); i++ ) {
if ( programSource.charAt(i) == '\n' ) {
if ( i <= errorPos ) {
lineStart = i + 1;
} else {
lineEnd = i;
break;
}
}
}
if ( lineEnd == -1 )
lineEnd = programSource.length();
ShadersTest.kill("Low-level program error in file: " + programFile
+ "\n\tError line: " + programSource.substring(lineStart, lineEnd)
+ "\n\tError message: " + glGetString(GL_PROGRAM_ERROR_STRING_ARB));
}
}
protected static int getUniformLocation(int ID, String name) {
final int location = glGetUniformLocationARB(ID, name);
if ( location == -1 )
throw new IllegalArgumentException("The uniform \"" + name + "\" does not exist in the Shader Program.");
return location;
}
protected static void printShaderObjectInfoLog(String file, int ID) {
final int logLength = glGetObjectParameteriARB(ID, GL_OBJECT_INFO_LOG_LENGTH_ARB);
if ( logLength <= 1 )
return;
System.out.println("\nInfo Log of Shader Object: " + file);
System.out.println("--------------------------");
System.out.println(glGetInfoLogARB(ID, logLength));
}
protected static void printShaderProgramInfoLog(int ID) {
final int logLength = glGetObjectParameteriARB(ID, GL_OBJECT_INFO_LOG_LENGTH_ARB);
if ( logLength <= 1 )
return;
System.out.println("\nShader Program Info Log: ");
System.out.println("--------------------------");
System.out.println(glGetInfoLogARB(ID, logLength));
}
}