How do you erase during a _draw() call? (Blend modes?): Page 2

How do you erase during a _draw() call? (Blend modes?)

Ephemeral

@TwistedTwigleg said: Do you mind linking to the Game Maker Studio 2 feature so we can look at it?

Um, there's no "feature". There is only the obvious consequence of the fact that GMS2 doesn't cache its Draw Events; it just renders each line of code directly to the render target in sequence without an intermediate step. We've already established that this approach does not translate to Godot because in Godot the render target of a _draw() call is an inaccessible cache.

Alec20

Im having the exact same problem, how can I make use of the blend modes, if they are there is for something, maybe we're not understanding it (or it can be a bug, but that's less likely) the second image should show a black window with a gray hole (because thats the default color to clear the canvas), but it shows white, so it ignored the substract blend mode.

Calinou

@Alec20 CanvasItemMaterial blend modes do not affect draw_*() calls. They only affect the final sprite's rendering.

Alec20

how could I do the thing I want to do? in the example is just a hole in the rectangle, so you can see through it, I do something like this in GMS2 to make a fast illumination system that runs well with many lights on a low end mobile device

in GameMaker I use a surface for this, i think a viewport is the equivalent in Godot. In GM I use the blend modes to obscure the window and then draw light sprites in substract mode to make some places more visible, the result is something like this

that's an example I made for GMS2 if you find it useful https://github.com/AlecAcosta/Lights

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