OpenGL 4 Shading Language Cookbook - Third Edition

Getting ready

There's a bunch of setup needed here, so we'll go into a bit of detail with some code segments. First, we'll set up a buffer for our atomic counter:

GLuint counterBuffer;  
glGenBuffers(1, &counterBuffer); 
glBindBufferBase(GL_ATOMIC_COUNTER_BUFFER, 0, counterBuffer); 
glBufferData(GL_ATOMIC_COUNTER_BUFFER, sizeof(GLuint), NULL, 
       GL_DYNAMIC_DRAW); 

Next, we will create a buffer for our linked list storage:

GLuint llBuf; 
glGenBuffers(1, &llBuf); 
glBindBufferBase(GL_SHADER_STORAGE_BUFFER, 0, llBuf); 
glBufferData(GL_SHADER_STORAGE_BUFFER, maxNodes * nodeSize, NULL, 
       GL_DYNAMIC_DRAW); 

nodeSize in the previous code is the size of struct NodeType used in the fragment shader (in the latter part of the code). This is computed based on the  ...