vlineRgba function
Implementation
int vlineRgba(Pointer<SdlRenderer> renderer, int x, int y1, int y2, int r,
int g, int b, int a) {
int result = 0;
result |= sdlSetRenderDrawBlendMode(
renderer, (a == 255) ? SDL_BLENDMODE_NONE : SDL_BLENDMODE_BLEND);
result |= sdlSetRenderDrawColor(renderer, r, g, b, a);
result |= sdlRenderDrawLine(renderer, x, y1, x, y2);
return result;
}