BBMOD_DynamicBatch

constructor

new BBMOD_DynamicBatch([_model[, _size[, _slotsPerInstance]]])

Description

A dynamic batch is a structure that allows you to render multiple instances of a single model at once, each with its own position, scale and rotation. Compared to BBMOD_Model.submit, this drastically reduces draw calls and increases performance, but requires more memory. Number of model instances per batch is also affected by maximum number of uniforms that a vertex shader can accept.

Arguments

Name	Type	Description
_model	`Struct.BBMOD_Model`	The model to create a dynamic batch of.
_size	`Real`	Number of model instances in the batch. Default value is 32.
_slotsPerInstance	`Real`	Number of slots that each instance takes in the data array. Default value is 12.

Properties

Name	Description
Batch	The batched model.
BatchLength	Total length of batch data array for a single draw call.
DataWriter	A function that writes instance data into the batch data array. It must take the instance, array and starting index as arguments! Defaults to BBMOD_DynamicBatch.default_fn.
InstanceCount	Number of instances currently added to the dynamic batch.
Model	A model that is being batched.
Size	Number of model instances in the batch.
SlotsPerInstance	Number of slots that each instance takes in the data array.

Methods

Name	Description
add_instance	Adds an instance to the dynamic batch.
default_fn	The default data writer function. Uses instance's variables `x`, `y`, `z` for position, `image_xscale` for uniform scale and `image_angle` for rotation around the `z` axis.
freeze	Freezes the dynamic batch. This makes it render faster.
remove_instance	Removes an instance from the dynamic batch.
render	Enqueues the dynamic batch for rendering.
render_object	Enqueues all instances of an object for rendering in batches of BBMOD_DynamicBatch.size.
submit	Immediately submits the dynamic batch for rendering.
submit_object	Immediately submits all instances of an object for rendering in batches of BBMOD_DynamicBatch.size.
update_instance	Updates batch data for given instance.

Example

Following code renders all instances of a car object in batches of 64.

/// @desc Create event
modCar = new BBMOD_Model("Car.bbmod");
matCar = new BBMOD_DefaultMaterial(BBMOD_ShDefaultBatched,
    sprite_get_texture(SprCar, 0));
carBatch = new BBMOD_DynamicBatch(modCar, 64);

/// @desc Draw event
carBatch.render_object(OCar, matCar);