# SDL_SetRenderDrawBlendMode Set the blend mode used for drawing operations (Fill and Line). ## Header File Defined in [<SDL3/SDL_render.h>](https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_render.h) ## Syntax ```c bool SDL_SetRenderDrawBlendMode(SDL_Renderer *renderer, SDL_BlendMode blendMode); ``` ## Function Parameters | | | | | ------------------------------ | ------------- | ------------------------------------------------------- | | [SDL_Renderer](SDL_Renderer) * | **renderer** | the rendering context. | | [SDL_BlendMode](SDL_BlendMode) | **blendMode** | the [SDL_BlendMode](SDL_BlendMode) to use for blending. | ## Return Value (bool) Returns true on success or false on failure; call [SDL_GetError](SDL_GetError)() for more information. ## Remarks If the blend mode is not supported, the closest supported mode is chosen. ## Thread Safety This function should only be called on the main thread. ## Version This function is available since SDL 3.2.0. ## See Also - [SDL_GetRenderDrawBlendMode](SDL_GetRenderDrawBlendMode) ---- [CategoryAPI](CategoryAPI), [CategoryAPIFunction](CategoryAPIFunction), [CategoryRender](CategoryRender)