Method update

samples/_opengl/ParticleSphereGPU/src/ParticleSphereGPUApp.cpp:158–184

}

void ParticleSphereGPUApp::update()
{
	// Update particles on the GPU
	gl::ScopedGlslProg prog( mUpdateProg );
	gl::ScopedState rasterizer( GL_RASTERIZER_DISCARD, true );	// turn off fragment stage
	mUpdateProg->uniform( "uMouseForce", mMouseForce );
	mUpdateProg->uniform( "uMousePos", mMousePos );

	// Bind the source data (Attributes refer to specific buffers).
	gl::ScopedVao source( mAttributes[mSourceIndex] );
	// Bind destination as buffer base.
	gl::bindBufferBase( GL_TRANSFORM_FEEDBACK_BUFFER, 0, mParticleBuffer[mDestinationIndex] );
	gl::beginTransformFeedback( GL_POINTS );

	// Draw source into destination, performing our vertex transformations.
	gl::drawArrays( GL_POINTS, 0, NUM_PARTICLES );

	gl::endTransformFeedback();

	// Swap source and destination for next loop
	std::swap( mSourceIndex, mDestinationIndex );

	// Update mouse force.
	if( mMouseDown ) {
		mMouseForce = 150.0f;
	}
}

void ParticleSphereGPUApp::draw()
{