Module: SDL2::BlendMode

Defined in:

ext/sdl2_ext/video.c,
ext/sdl2_ext/video.c

Overview

Constants represent blend mode for Renderer.copy and drawing operations.

You can change the blending mode using Renderer#draw_blend_mode= and Texture#blend_mode=.

In the backend of SDL, opengl or direct3d blending mechanism is used for blending operations.

Constant Summary

NONE =

no blending (dstRGBA = srcRGBA)

INT2FIX(SDL_BLENDMODE_NONE)

BLEND =

alpha blending (dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA), dstA = srcA + (dstA * (1-srcA)))

INT2FIX(SDL_BLENDMODE_BLEND)

ADD =

additive blending (dstRGB = (srcRGB * srcA) + dstRGB, dstA = dstA)

INT2FIX(SDL_BLENDMODE_ADD)

MOD =

color modulate (multiplicative) (dstRGB = srcRGB * dstRGB, dstA = dstA)

INT2FIX(SDL_BLENDMODE_MOD)