public static void init(GL2 gl) throws OpenGLException {
// permutation setup
permutation = new int[256];
for (int i = 0; i < 256; i++) {
permutation[i] = i;
}
Random rand = new Random();
for (int i = 255; i > 0; i--) {
int index = rand.nextInt(i + 1);
int tmp = permutation[i];
permutation[i] = permutation[index];
permutation[index] = tmp;
}
byte[] permutationBytes = new byte[256 * 4];
int count = 0;
for (int i = 0; i < 255; i++) {
permutationBytes[count++] = (byte) (0xFF & permutation[i]);
permutationBytes[count++] = (byte) (0xFF & permutation[i]);
permutationBytes[count++] = (byte) (0xFF & permutation[i]);
permutationBytes[count++] = (byte) (0xFF & permutation[i]);
}
ByteBuffer permBuff = ByteBuffer.wrap(permutationBytes);
permutationTexture = new Texture2D(gl, Format.RGBA, Datatype.INT8, 256, 1, permBuff);
permutationTexture.setWrapModeOne(gl, WrapMode.REPEAT, TextureWrapCoordinate.S);
permutationTexture.setWrapModeOne(gl, WrapMode.CLAMP, TextureWrapCoordinate.T);
permutationTexture.enableInterpolation(gl, false);
// gradient setup
gradients =
new int[][] {
{1, 1, 0}, {-1, 1, 0}, {1, -1, 0}, {-1, -1, 0}, {1, 0, 1}, {-1, 0, 1}, {1, 0, -1},
{-1, 0, -1}, {0, 1, 1}, {0, -1, 1}, {0, 1, -1}, {0, -1, -1}, {1, 1, 0}, {0, -1, 1},
{-1, 1, 0}, {0, -1, -1}
};
float[] gradientBytes = new float[16 * 4];
for (int i = 0; i < 16; i++) {
gradientBytes[i * 4] = gradients[i][0];
gradientBytes[i * 4 + 1] = gradients[i][1];
gradientBytes[i * 4 + 2] = gradients[i][2];
gradientBytes[i * 4 + 3] = 1;
}
FloatBuffer gradBuff = FloatBuffer.wrap(gradientBytes);
gradientTexture = new Texture2D(gl, Format.RGBA, Datatype.FLOAT16, 16, 1, gradBuff);
// gradientTexture.setWrapModeOne(gl, WrapMode.REPEAT, TextureWrapCoordinate.S);
// gradientTexture.setWrapModeOne(gl, WrapMode.CLAMP, TextureWrapCoordinate.T);
gradientTexture.setWrapModeAll(gl, WrapMode.REPEAT);
gradientTexture.enableInterpolation(gl, false);
}
/**
* Destroys this framebuffer object.
*
* <p>The owned textures are also destroyed, so copy any you need first!
*/
public void releaseGPUResources(GL2 gl) {
/* Release textures. */
for (Texture2D tex : mColorTextures) {
tex.releaseGPUResources(gl);
}
if (mDepthTexture != null) {
mDepthTexture.releaseGPUResources(gl);
}
/* Destroy the FBO itself. */
if (mHandle >= 0) {
int names[] = new int[1];
names[0] = mHandle;
gl.glDeleteFramebuffers(1, names, 0);
mHandle = -1;
}
}
/**
* Creates a new FBO with the passed attributes and number of render targets.
*
* @param gl The OpenGL context in which this FBO lives.
* @param format The format for data in the color textures.
* @param datatype The datatype for data in the color textures.
* @param width The width of the renderable viewport and all the textures.
* @param height The height of the renderable viewport and all the textures.
* @param colorTextureCount The number of associated color textures/render targets. May specify 0
* if you don't care about color output. It is an error to request 0 color textures and no
* depth buffer.
* @param makeDepthTexture True if a depth texture should be created. False if you don't need a
* depth buffer. It is an error to request 0 color textures and no depth buffer.
* @param rectTextures If true, the created textures will be rectangular textures. If false, they
* will be regular 2D textures, which requires GL_EXT_texture_non_power_of_two if `width` and
* `height` aren't powers of two.
*/
public FramebufferObject(
GL2 gl,
Texture2D.Format format,
Texture2D.Datatype datatype,
int width,
int height,
int colorTextureCount,
boolean makeDepthTexture,
boolean rectTextures)
throws OpenGLException {
/* Sanity check. */
if (colorTextureCount == 0 && !makeDepthTexture) {
throw new OpenGLException(
"It is not valid to make an FBO with no color buffers and no depth buffer.");
}
int maxColorTextures[] = new int[1];
gl.glGetIntegerv(GL2.GL_MAX_COLOR_ATTACHMENTS, maxColorTextures, 0);
if (colorTextureCount > maxColorTextures[0]) {
throw new OpenGLException(
"Cannot create an FBO with "
+ colorTextureCount
+ " render targets. Your graphics card only supports "
+ maxColorTextures[0]
+ ".");
}
mWidth = width;
mHeight = height;
/* Create OpenGL FBO. */
int names[] = new int[1];
gl.glGenFramebuffers(1, names, 0);
mHandle = names[0];
/* Remember previous FBO binding, and then bind this one. */
int previousBinding[] = new int[1];
gl.glGetIntegerv(GL2.GL_FRAMEBUFFER_BINDING, previousBinding, 0);
gl.glBindFramebuffer(GL2.GL_FRAMEBUFFER, mHandle);
/* Create and attach color textures. */
mColorTextures = new Texture2D[colorTextureCount];
for (int i = 0; i < colorTextureCount; ++i) {
mColorTextures[i] = new Texture2D(gl, format, datatype, width, height, null, rectTextures);
gl.glFramebufferTexture2D(
GL2.GL_FRAMEBUFFER,
GL2.GL_COLOR_ATTACHMENT0 + i,
mColorTextures[i].getTextureTarget(),
mColorTextures[i].getHandle(),
0);
}
/* Create and attach depth texture, if requested. */
if (makeDepthTexture) {
mDepthTexture =
new Texture2D(gl, Format.DEPTH, Datatype.INT32, width, height, null, rectTextures);
gl.glFramebufferTexture2D(
GL2.GL_FRAMEBUFFER,
GL2.GL_DEPTH_ATTACHMENT,
mDepthTexture.getTextureTarget(),
mDepthTexture.getHandle(),
0);
}
/* Make sure everything is set up properly. */
int status = gl.glCheckFramebufferStatus(GL2.GL_FRAMEBUFFER);
if (status != GL2.GL_FRAMEBUFFER_COMPLETE) {
throw new OpenGLException("Framebuffer incomplete: " + status + ".");
}
/* Restore whatever FBO was bound before this function was called. */
gl.glBindFramebuffer(GL2.GL_FRAMEBUFFER, previousBinding[0]);
}
public static void unbind(GL2 gl) {
permutationTexture.unbind(gl);
gradientTexture.unbind(gl);
}
public static void bind(GL2 gl, int textureUnit1, int textureUnit2) throws OpenGLException {
permutationTexture.bind(gl, textureUnit1);
gradientTexture.bind(gl, textureUnit2);
}