def _vertexBuffersSetup(
self, mesh: MeshData) -> Optional[QOpenGLVertexArrayObject]:
# See if the mesh has already been stored to the GPU:
vao = cast(Optional[QOpenGLVertexArrayObject],
mesh.getCachedUserValue(self._shader.getReferenceKey()))
if vao is not None:
return vao
# Initialize VAO (VertexArrayObject). On activation, this will wrap around the other vertex/index buffers.
# That enables reusing them without much fuss.
if not OpenGLContext.properties["supportsVertexArrayObjects"]:
Logger.log(
"e",
"RenderBatch: This OpenGL doesn't support VAO? You will not go to R^3 today."
)
return None
vao = QOpenGLVertexArrayObject()
vao.create()
if not vao.isCreated():
Logger.log(
"e",
"RenderBatch: VAO not created. You will not go to R^3 today.")
return None
# Setup VAO:
vao.bind()
vertex_buffer = OpenGL.getInstance().createVertexBuffer(mesh)
vertex_buffer.bind()
index_buffer = OpenGL.getInstance().createIndexBuffer(mesh)
if index_buffer is not None:
index_buffer.bind()
self._setMeshAttributes(mesh)
# Cache and return:
mesh.setCachedUserValue(self._shader.getReferenceKey(), vao)
vao.release()
return vao
