/**
* Constructor that creates a Vertex Buffer Object with the specified GLSL attributes. (typically
* location, texture coordinates, normals, etc.)
*
* @param gl The global openGL instance.
* @param attribs One or more attributes that represent this VBO, @see GLSLAttrib
*/
public VBO(GL3 gl, GLSLAttrib... attribs) {
this.attribs = attribs;
// Generate a new internal OpenGL VBO pointer
this.vboPointer = Buffers.newDirectIntBuffer(1);
gl.glGenVertexArrays(1, this.vboPointer);
gl.glBindVertexArray(this.vboPointer.get(0));
// Generate a new internal OpenGL Array Buffer pointer
this.bufferPointer = Buffers.newDirectIntBuffer(1);
gl.glGenBuffers(1, this.bufferPointer);
gl.glBindBuffer(GL3.GL_ARRAY_BUFFER, this.bufferPointer.get(0));
// Allocate enough memory
int size = 0;
for (final GLSLAttrib attrib : attribs) {
size += attrib.buffer.capacity() * Buffers.SIZEOF_FLOAT;
}
gl.glBufferData(GL3.GL_ARRAY_BUFFER, size, (Buffer) null, GL3.GL_STATIC_DRAW);
// Copy the GLSL Attribute data into the internal OpenGL buffer
int nextStart = 0;
for (final GLSLAttrib attrib : attribs) {
gl.glBufferSubData(
GL3.GL_ARRAY_BUFFER,
nextStart,
attrib.buffer.capacity() * Buffers.SIZEOF_FLOAT,
attrib.buffer);
nextStart += attrib.buffer.capacity() * Buffers.SIZEOF_FLOAT;
}
}
