void blend(drawable_type dw, const rectangle& area, pixel_color_t color, double fade_rate)
{
if (fade_rate <= 0) return;
if (fade_rate > 1) fade_rate = 1;
rectangle r;
if (false == ::nana::overlap(rectangle{ drawable_size(dw) }, area, r))
return;
unsigned red = static_cast<unsigned>((color.value & 0xFF0000) * fade_rate);
unsigned green = static_cast<unsigned>((color.value & 0xFF00) * fade_rate);
unsigned blue = static_cast<unsigned>((color.value & 0xFF) * fade_rate);
double lrate = 1 - fade_rate;
pixel_buffer pixbuf(dw, r.y, r.height);
for (std::size_t row = 0; row < r.height; ++row)
{
auto i = pixbuf.raw_ptr(row) + r.x;
const auto end = i + r.width;
for (; i < end; ++i)
{
unsigned px_r = ((static_cast<unsigned>((i->value & 0xFF0000) * lrate) + red) & 0xFF0000);
unsigned px_g = ((static_cast<unsigned>((i->value & 0xFF00) * lrate) + green) & 0xFF00);
unsigned px_b = ((static_cast<unsigned>((i->value & 0xFF) * lrate) + blue) & 0xFF);
i->value = (px_r | px_g | px_b);
}
}
pixbuf.paste(nana::rectangle(r.x, 0, r.width, r.height), dw, point{r.x, r.y});
}
SDLContext::SDLContext(const rainbow::Config& config)
: window_(nullptr), vsync_(false), fullscreen_(0), context_(nullptr)
{
if (SDL_Init(SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER) < 0)
{
LOGF("SDL: Unable to initialise video: %s", SDL_GetError());
return;
}
#ifdef RAINBOW_OS_MACOS
// Prevent the full screen window from being minimized when losing focus.
SDL_SetHint(SDL_HINT_VIDEO_MINIMIZE_ON_FOCUS_LOSS, "0");
#endif
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 0);
if (config.msaa() > 0)
{
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, config.msaa());
}
const uint32_t flags = SDL_WINDOW_OPENGL | SDL_WINDOW_SHOWN |
(config.high_dpi() ? SDL_WINDOW_ALLOW_HIGHDPI : 0);
const Vec2i& size = ::window_size(config);
window_ = SDL_CreateWindow(RAINBOW_BUILD,
SDL_WINDOWPOS_CENTERED,
SDL_WINDOWPOS_CENTERED,
size.x,
size.y,
flags);
if (!window_)
{
R_ABORT("SDL: Failed to create window: %s", SDL_GetError());
return;
}
context_ = SDL_GL_CreateContext(window_);
if (!context_)
{
R_ABORT("SDL: Failed to create GL context: %s", SDL_GetError());
return;
}
#ifdef RAINBOW_JS
vsync_ = true;
#else
SDL_GL_SetSwapInterval(1);
vsync_ = SDL_GL_GetSwapInterval() == 1;
#endif
#ifndef NDEBUG
const Vec2i& resolution = drawable_size();
LOGI("SDL: Resolution: %ix%i", resolution.x, resolution.y);
int msaa = 0;
SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &msaa);
if (msaa > 0)
LOGI("SDL: Anti-aliasing: %ix MSAA", msaa);
else
LOGI("SDL: Anti-aliasing: Disabled");
LOGI("SDL: Vertical sync: %s", (vsync_ ? "Enabled" : "Disabled"));
#endif
}