private static int getMaxTextureUnits() {
IntBuffer buffer = BufferUtils.newIntBuffer(16);
if (Gdx.graphics.isGL20Available())
Gdx.gl.glGetIntegerv(GL20.GL_MAX_TEXTURE_IMAGE_UNITS, buffer);
else Gdx.gl.glGetIntegerv(GL10.GL_MAX_TEXTURE_UNITS, buffer);
return buffer.get(0);
}
/** Releases all resources associated with the FrameBuffer. */
public void dispose() {
GL20 gl = Gdx.graphics.getGL20();
IntBuffer handle = BufferUtils.newIntBuffer(1);
colorTexture.dispose();
if (hasDepth) {
handle.put(depthbufferHandle);
handle.flip();
gl.glDeleteRenderbuffers(1, handle);
}
handle.clear();
handle.put(framebufferHandle);
handle.flip();
gl.glDeleteFramebuffers(1, handle);
if (buffers.get(Gdx.app) != null) buffers.get(Gdx.app).removeValue(this, true);
}
private static int getMaxTextureUnits() {
IntBuffer buffer = BufferUtils.newIntBuffer(16);
Gdx.gl.glGetIntegerv(GL20.GL_MAX_TEXTURE_IMAGE_UNITS, buffer);
return buffer.get(0);
}
private void build() {
if (!Gdx.graphics.isGL20Available()) throw new GdxRuntimeException("GL2 is required.");
GL20 gl = Gdx.graphics.getGL20();
// iOS uses a different framebuffer handle! (not necessarily 0)
if (!defaultFramebufferHandleInitialized) {
defaultFramebufferHandleInitialized = true;
if (Gdx.app.getType() == ApplicationType.iOS) {
IntBuffer intbuf =
ByteBuffer.allocateDirect(16 * Integer.SIZE / 8)
.order(ByteOrder.nativeOrder())
.asIntBuffer();
gl.glGetIntegerv(GL20.GL_FRAMEBUFFER_BINDING, intbuf);
defaultFramebufferHandle = intbuf.get(0);
} else {
defaultFramebufferHandle = 0;
}
}
setupTexture();
IntBuffer handle = BufferUtils.newIntBuffer(1);
gl.glGenFramebuffers(1, handle);
framebufferHandle = handle.get(0);
if (hasDepth) {
handle.clear();
gl.glGenRenderbuffers(1, handle);
depthbufferHandle = handle.get(0);
}
gl.glBindTexture(GL20.GL_TEXTURE_2D, colorTexture.getTextureObjectHandle());
if (hasDepth) {
gl.glBindRenderbuffer(GL20.GL_RENDERBUFFER, depthbufferHandle);
gl.glRenderbufferStorage(
GL20.GL_RENDERBUFFER,
GL20.GL_DEPTH_COMPONENT16,
colorTexture.getWidth(),
colorTexture.getHeight());
}
gl.glBindFramebuffer(GL20.GL_FRAMEBUFFER, framebufferHandle);
gl.glFramebufferTexture2D(
GL20.GL_FRAMEBUFFER,
GL20.GL_COLOR_ATTACHMENT0,
GL20.GL_TEXTURE_2D,
colorTexture.getTextureObjectHandle(),
0);
if (hasDepth) {
gl.glFramebufferRenderbuffer(
GL20.GL_FRAMEBUFFER, GL20.GL_DEPTH_ATTACHMENT, GL20.GL_RENDERBUFFER, depthbufferHandle);
}
int result = gl.glCheckFramebufferStatus(GL20.GL_FRAMEBUFFER);
gl.glBindRenderbuffer(GL20.GL_RENDERBUFFER, 0);
gl.glBindTexture(GL20.GL_TEXTURE_2D, 0);
gl.glBindFramebuffer(GL20.GL_FRAMEBUFFER, defaultFramebufferHandle);
if (result != GL20.GL_FRAMEBUFFER_COMPLETE) {
colorTexture.dispose();
if (hasDepth) {
handle.clear();
handle.put(depthbufferHandle);
handle.flip();
gl.glDeleteRenderbuffers(1, handle);
}
colorTexture.dispose();
handle.clear();
handle.put(framebufferHandle);
handle.flip();
gl.glDeleteFramebuffers(1, handle);
if (result == GL20.GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT)
throw new IllegalStateException(
"frame buffer couldn't be constructed: incomplete attachment");
if (result == GL20.GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS)
throw new IllegalStateException(
"frame buffer couldn't be constructed: incomplete dimensions");
if (result == GL20.GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT)
throw new IllegalStateException("frame buffer couldn't be constructed: missing attachment");
if (result == GL20.GL_FRAMEBUFFER_UNSUPPORTED)
throw new IllegalStateException(
"frame buffer couldn't be constructed: unsupported combination of formats");
throw new IllegalStateException(
"frame buffer couldn't be constructed: unknown error " + result);
}
}