SDL_SetSurfaceBlendMode
Use this function to set the blend mode used for blit operations.
Contents
Syntax
int SDL_SetSurfaceBlendMode(SDL_Surface* surface,
SDL_BlendMode blendMode)
Function Parameters
surface |
the SDL_Surface structure to update |
blendMode |
the SDL_BlendMode to use for blit blending; see Remarks for details |
Return Value
Returns 0 on success or a negative error code on failure; call SDL_GetError() for more information.
Code Examples
You can add your code example here
Remarks
blendMode may be one of the following:
SDL_BLENDMODE_NONE |
no blending |
|
dstRGBA = srcRGBA |
SDL_BLENDMODE_BLEND |
alpha blending |
|
dstRGB = (srcRGB * srcA) + (dstRGB * (1-srcA)) |
|
dstA = srcA + (dstA * (1-srcA)) |
SDL_BLENDMODE_ADD |
additive blending |
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dstRGB = (srcRGB * srcA) + dstRGB |
|
dstA = dstA |
SDL_BLENDMODE_MOD |
color modulate |
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dstRGB = srcRGB * dstRGB |
|
dstA = dstA |
To copy a surface to another surface (or texture) without blending with the existing data, the blendmode of the SOURCE surface should be set to 'SDL_BLENDMODE_NONE'.
