利用者:Matpi/BGE 2DFilters 1

Planning

Goal

Enhance the current 2D Filters system in the BGE - make it easier to use and add features to it.

Proposed changes

• New uniforms

New uniforms will add access to basic and useful uniforms for GLSL shaders without having to use logic bricks or Python. These uniforms would be:

- World colors, i.e. Ambient/Mist/Background

This makes it convenient to create background shaders such as gradient skies, etc. using colors defined in the UI.

- Position/Orientation/Perspective of the current camera

In the same context of gradient skies, this allows to create a correct gradient with respect to the direction the camera looks into.

• Variable strength parameter

It can be useful to only add a subtle shader effect rather than replacing the rendered texture with it. A "strength" parameter added to some of the 2D Filter Actuators would fulfill this task.

A currently open revision implements this, but needs more work: D1375

• Interaction with VideoTextures

see VideoTexture enhancement

Implementation

• New Uniforms

- World colors: Retrieved from KX_GetActiveScene()->GetWorldInfo(); some getters would be added to KX_WorldInfo.

• Variable strength parameter

Ideally using function like glAccum in the filter rendering method.