SDLVisibleSurface.cc

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#include "SDLVisibleSurface.hh"
#include "SDLOffScreenSurface.hh"
#include "PNG.hh"
#include "SDLSnow.hh"
#include "OSDConsoleRenderer.hh"
#include "OSDGUILayer.hh"
#include "MSXException.hh"
#include "unreachable.hh"
#include "vla.hh"
#include "build-info.hh"
#include <cstdint>
#include <memory>
 
namespace openmsx {
 
SDLVisibleSurface::SDLVisibleSurface(
                unsigned width, unsigned height,
                Display& display_,
                RTScheduler& rtScheduler_,
                EventDistributor& eventDistributor_,
                InputEventGenerator& inputEventGenerator_,
                CliComm& cliComm_,
                VideoSystem& videoSystem_)
        : SDLVisibleSurfaceBase(display_, rtScheduler_, eventDistributor_,
                                inputEventGenerator_, cliComm_, videoSystem_)
{
        int flags = 0;
        createSurface(width, height, flags);
 
        renderer.reset(SDL_CreateRenderer(window.get(), -1, 0));
        if (!renderer) {
                std::string err = SDL_GetError();
                throw InitException("Could not create renderer: " + err);
        }
        SDL_RenderSetLogicalSize(renderer.get(), width, height);
        setSDLRenderer(renderer.get());
 
        surface.reset(SDL_CreateRGBSurface(
                0, width, height, 32,
                0x00FF0000, 0x0000FF00, 0x000000FF, 0xFF000000));
        if (!surface) {
                std::string err = SDL_GetError();
                throw InitException("Could not create surface: " + err);
        }
        setSDLSurface(surface.get());
 
        texture.reset(SDL_CreateTexture(
                renderer.get(), SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING,
                width, height));
        if (!texture) {
                std::string err = SDL_GetError();
                throw InitException("Could not create texture: " + err);
        }
 
        setSDLPixelFormat(*surface->format);
 
        // In the SDL renderer logical size is the same as physical size.
        gl::ivec2 size(width, height);
        calculateViewPort(size, size);
}
 
void SDLVisibleSurface::flushFrameBuffer()
{
        SDL_Renderer* render = getSDLRenderer();
        SDL_UpdateTexture(texture.get(), nullptr, surface->pixels, surface->pitch);
        SDL_RenderClear(render);
        SDL_RenderCopy(render, texture.get(), nullptr, nullptr);
}
 
void SDLVisibleSurface::finish()
{
        SDL_RenderPresent(getSDLRenderer());
}
 
std::unique_ptr<Layer> SDLVisibleSurface::createSnowLayer()
{
        switch (getPixelFormat().getBytesPerPixel()) {
#if HAVE_16BPP
        case 2:
                return std::make_unique<SDLSnow<uint16_t>>(*this, getDisplay());
#endif
#if HAVE_32BPP
        case 4:
                return std::make_unique<SDLSnow<uint32_t>>(*this, getDisplay());
#endif
        default:
                UNREACHABLE; return nullptr;
        }
}
 
std::unique_ptr<Layer> SDLVisibleSurface::createConsoleLayer(
                Reactor& reactor, CommandConsole& console)
{
        const bool openGL = false;
        auto [width, height] = getLogicalSize();
        return std::make_unique<OSDConsoleRenderer>(
                reactor, console, width, height, openGL);
}
 
std::unique_ptr<Layer> SDLVisibleSurface::createOSDGUILayer(OSDGUI& gui)
{
        return std::make_unique<SDLOSDGUILayer>(gui);
}
 
std::unique_ptr<OutputSurface> SDLVisibleSurface::createOffScreenSurface()
{
        return std::make_unique<SDLOffScreenSurface>(*surface);
}
 
void SDLVisibleSurface::saveScreenshot(const std::string& filename)
{
        saveScreenshotSDL(*this, filename);
}
 
void SDLVisibleSurface::saveScreenshotSDL(
        const SDLOutputSurface& output, const std::string& filename)
{
        auto [width, height] = output.getLogicalSize();
        VLA(const void*, rowPointers, height);
        MemBuffer<uint8_t> buffer(width * height * 3);
        for (int i = 0; i < height; ++i) {
                rowPointers[i] = &buffer[width * 3 * i];
        }
        if (SDL_RenderReadPixels(
                        output.getSDLRenderer(), nullptr,
                        SDL_PIXELFORMAT_RGB24, buffer.data(), width * 3)) {
                throw MSXException("Couldn't acquire screenshot pixels: ", SDL_GetError());
        }
        PNG::save(width, height, rowPointers, filename);
}
 
void SDLVisibleSurface::clearScreen()
{
        SDL_FillRect(surface.get(), nullptr, 0);
}
 
} // namespace openmsx