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package demos.apx;
import java.io.UnsupportedEncodingException;
import java.nio.*;
import javax.media.opengl.*;
import javax.media.opengl.glu.*;
public class Shader {
private int program;
private int vertexShader;
private int fragmentShader;
private Shader() {
}
public static Shader createBinaryProgram(byte[] vertexShaderCode, int vertexShaderFormat,
byte[] fragmentShaderCode, int fragmentShaderFormat) throws GLException {
Shader shader = new Shader();
shader.createBinaryProgramImpl(vertexShaderCode, vertexShaderFormat,
fragmentShaderCode, fragmentShaderFormat);
shader.useProgram();
return shader;
}
public void setAttribByName(String name, int size, int type, boolean normalized, int stride, Buffer pointer) {
GL gl = GLU.getCurrentGL();
int index = gl.glGetAttribLocation(program, name);
gl.glVertexAttribPointer(index, size, type, normalized, stride, pointer);
gl.glEnableVertexAttribArray(index);
// FIXME
// trackAttribLocation(index);
}
public int getUniformLocation(String name) {
GL gl = GLU.getCurrentGL();
return gl.glGetUniformLocation(program, name);
}
public void useProgram() {
GL gl = GLU.getCurrentGL();
gl.glUseProgram(program);
}
//----------------------------------------------------------------------
// Internals only below this point
//
private void createBinaryProgramImpl(byte[] vertexShaderCode, int vertexShaderFormat,
byte[] fragmentShaderCode, int fragmentShaderFormat) throws GLException {
allocProgram();
int[] numBinaryFormats = new int[1];
GL gl = GLU.getCurrentGL();
gl.glGetIntegerv(GL.GL_NUM_SHADER_BINARY_FORMATS, numBinaryFormats, 0);
if (numBinaryFormats[0] > 0) {
int[] binaryFormats = new int[numBinaryFormats[0]];
gl.glGetIntegerv(GL.GL_SHADER_BINARY_FORMATS, binaryFormats, 0);
boolean gotVertexFormat = false;
boolean gotFragmentFormat = false;
for (int i = 0; i < binaryFormats.length && (!gotVertexFormat || !gotFragmentFormat); i++) {
if (!gotVertexFormat) {
gotVertexFormat = (binaryFormats[i] == vertexShaderFormat);
}
if (!gotFragmentFormat) {
gotFragmentFormat = (binaryFormats[i] == fragmentShaderFormat);
}
}
if (!gotVertexFormat) {
throw new RuntimeException("Binary vertex program format 0x" + Integer.toHexString(vertexShaderFormat) +
" not available");
}
if (!gotFragmentFormat) {
throw new RuntimeException("Binary fragment program format 0x" + Integer.toHexString(fragmentShaderFormat) +
" not available");
}
}
// Set up the shaders
setupBinaryShader(vertexShader, vertexShaderCode, vertexShaderFormat);
setupBinaryShader(fragmentShader, fragmentShaderCode, fragmentShaderFormat);
// Set up the shader program
gl.glLinkProgram(program);
if (!glslLog(program, GL.GL_LINK_STATUS, "link")) {
throw new GLException("Error linking program");
}
}
private void allocProgram() {
GL gl = GLU.getCurrentGL();
vertexShader = gl.glCreateShader(GL.GL_VERTEX_SHADER);
fragmentShader = gl.glCreateShader(GL.GL_FRAGMENT_SHADER);
program = gl.glCreateProgram();
gl.glAttachShader(program, vertexShader);
gl.glAttachShader(program, fragmentShader);
}
private void setupBinaryShader(int shader,
byte[] shaderData,
int binaryFormat) {
ByteBuffer buf = ByteBuffer.wrap(shaderData);
int[] tmp = new int[1];
tmp[0] = shader;
GL gl = GLU.getCurrentGL();
gl.glShaderBinary(1, tmp, 0, binaryFormat, buf, shaderData.length);
}
private boolean glslLog(int obj, int checkCompile, String op) {
boolean success = false;
GL gl = GLU.getCurrentGL();
// log output.
String str = null;
if (checkCompile == GL.GL_COMPILE_STATUS) {
int[] len = new int[1];
gl.glGetShaderiv(obj, GL.GL_INFO_LOG_LENGTH, len, 0);
if (len[0] > 0) {
byte[] buf = new byte[len[0]];
gl.glGetShaderInfoLog(obj, len[0], null, 0, buf, 0);
try {
str = new String(buf, 0, buf.length, "US-ASCII");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
} else {
// LINK or VALIDATE
int[] len = new int[1];
gl.glGetProgramiv(obj, GL.GL_INFO_LOG_LENGTH, len, 0);
if (len[0] > 0) {
byte[] buf = new byte[len[0]];
gl.glGetProgramInfoLog(obj, len[0], null, 0, buf, 0);
try {
str = new String(buf, 0, buf.length, "US-ASCII");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
}
}
if (str != null) {
System.out.println("--- ");
System.out.println(op);
System.out.println(" log ---");
System.out.println(str);
}
// check the compile / link status.
if (checkCompile == GL.GL_COMPILE_STATUS) {
int[] status = new int[1];
gl.glGetShaderiv(obj, checkCompile, status, 0);
success = (status[0] != 0);
if (!success) {
int[] len = new int[1];
gl.glGetShaderiv(obj, GL.GL_SHADER_SOURCE_LENGTH, len, 0);
if (len[0] > 0) {
byte[] buf = new byte[len[0]];
gl.glGetShaderSource(obj, len[0], null, 0, buf, 0);
try {
str = new String(buf, 0, buf.length, "US-ASCII");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
if (str != null) {
System.out.println("--- ");
System.out.println(op);
System.out.println(" code ---");
System.out.println(str);
}
}
}
} else { // LINK or VALIDATE
int[] status = new int[1];
gl.glGetProgramiv(obj, checkCompile, status, 0);
success = (status[0] != 0);
}
if (!success) {
System.out.println("--- ");
System.out.println(op);
System.out.println(" failed");
}
return success;
}
}
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