Show Shader.java syntax highlighted
/*
* Copyright (c) 2002-2004 LWJGL Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * 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
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Created by LWJGL.
* User: spasi
* Date: 2004-03-30
* Time: 8:41:42 pm
*/
package org.lwjgl.test.opengl.shaders;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.nio.IntBuffer;
import org.lwjgl.BufferUtils;
import org.lwjgl.opengl.ARBProgram;
import org.lwjgl.opengl.ARBShaderObjects;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.Util;
abstract class Shader {
private static final IntBuffer int_buffer = BufferUtils.createIntBuffer(16);
protected static IntBuffer programBuffer = BufferUtils.createIntBuffer(1);
protected static ByteBuffer fileBuffer = BufferUtils.createByteBuffer(1024 * 10);
protected Shader() {
}
abstract void render();
abstract void cleanup();
/**
* Obtain a GL integer value from the driver
*
* @param gl_enum The GL value you want
*
* @return the integer value
*/
public static int glGetInteger(int gl_enum) {
GL11.glGetInteger(gl_enum, int_buffer);
return int_buffer.get(0);
}
protected static ByteBuffer getShaderText(String file) {
ByteBuffer shader = null;
try {
ClassLoader loader = ShadersTest.class.getClassLoader();
InputStream inputStream = loader.getResourceAsStream("org/lwjgl/test/opengl/shaders/" + file);
if ( inputStream == null )
ShadersTest.kill("A shader source file could not be found: " + file);
BufferedInputStream stream = new BufferedInputStream(inputStream);
byte character;
while ( (character = (byte)stream.read()) != -1 )
fileBuffer.put(character);
stream.close();
fileBuffer.flip();
shader = BufferUtils.createByteBuffer(fileBuffer.limit());
shader.put(fileBuffer);
shader.clear();
fileBuffer.clear();
} catch (IOException e) {
ShadersTest.kill("Failed to read the shader source file: " + file, e);
}
return shader;
}
protected static void checkProgramError(String programFile, ByteBuffer programSource) {
if ( GL11.glGetError() == GL11.GL_INVALID_OPERATION ) {
programSource.clear();
final byte[] bytes = new byte[programSource.capacity()];
programSource.get(bytes);
final int errorPos = glGetInteger(ARBProgram.GL_PROGRAM_ERROR_POSITION_ARB);
int lineStart = 0;
int lineEnd = -1;
for ( int i = 0; i < bytes.length; i++ ) {
if ( bytes[i] == '\n' ) {
if ( i <= errorPos ) {
lineStart = i + 1;
} else {
lineEnd = i;
break;
}
}
}
if ( lineEnd == -1 )
lineEnd = bytes.length;
ShadersTest.kill("Low-level program error in file: " + programFile
+ "\n\tError line: " + new String(bytes, lineStart, lineEnd - lineStart)
+ "\n\tError message: " + GL11.glGetString(ARBProgram.GL_PROGRAM_ERROR_STRING_ARB));
}
}
protected static int getUniformLocation(int ID, String name) {
fileBuffer.clear();
int length = name.length();
char[] charArray = new char[length];
name.getChars(0, length, charArray, 0);
for ( int i = 0; i < length; i++ )
fileBuffer.put((byte)charArray[i]);
fileBuffer.put((byte)0); // Must be null-terminated.
fileBuffer.flip();
final int location = ARBShaderObjects.glGetUniformLocationARB(ID, fileBuffer);
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) {
ARBShaderObjects.glGetObjectParameterARB(ID, ARBShaderObjects.GL_OBJECT_INFO_LOG_LENGTH_ARB, programBuffer);
final int logLength = programBuffer.get(0);
if ( logLength <= 1 )
return;
final ByteBuffer log = BufferUtils.createByteBuffer(logLength);
ARBShaderObjects.glGetInfoLogARB(ID, null, log);
final char[] charArray = new char[logLength];
for ( int i = 0; i < logLength; i++ )
charArray[i] = (char)log.get();
System.out.println("\nInfo Log of Shader Object: " + file);
System.out.println("--------------------------");
System.out.println(new String(charArray, 0, logLength));
}
protected static void printShaderProgramInfoLog(int ID) {
ARBShaderObjects.glGetObjectParameterARB(ID, ARBShaderObjects.GL_OBJECT_INFO_LOG_LENGTH_ARB, programBuffer);
final int logLength = programBuffer.get(0);
if ( logLength <= 1 )
return;
final ByteBuffer log = BufferUtils.createByteBuffer(logLength);
ARBShaderObjects.glGetInfoLogARB(ID, null, log);
final char[] charArray = new char[logLength];
for ( int i = 0; i < logLength; i++ )
charArray[i] = (char)log.get();
System.out.println("\nShader Program Info Log: ");
System.out.println("--------------------------");
System.out.println(new String(charArray, 0, logLength));
}
}
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