psp sdl2 sample

CMakeLists.txt

cmake_minimum_required(VERSION 3.18.0)

project(TotalGB LANGUAGES C)

set(myname "TotalGB_SDL2")
add_executable(${myname} main.c)

option(UPSTREAM_SDL "use upstream sdl2" ON)

if (UPSTREAM_SDL)
    include(FetchContent)

    # log the git clone
    Set(FETCHCONTENT_QUIET FALSE)

    FetchContent_Declare(sdl2
        GIT_REPOSITORY https://github.com/libsdl-org/SDL.git
        GIT_TAG        main
        GIT_SHALLOW    TRUE
        GIT_PROGRESS   TRUE
    )

    FetchContent_MakeAvailable(sdl2)
    target_link_libraries(${myname} LINK_PRIVATE
        SDL2::SDL2-static
        SDL2::SDL2main
    )
else()
    target_link_libraries(${myname} LINK_PRIVATE
        SDL2::SDL2
        SDL2::SDL2main
    )
endif()

if (PSP)
    target_link_libraries(${myname} LINK_PRIVATE
        GL
        pspvram
        pspaudio
        pspvfpu
        pspdisplay
        pspgu
        pspge
        pspdebug
        psphprm
        pspctrl
    )

    create_pbp_file(TARGET ${myname} # CMake executable target
        TITLE "${CMAKE_PROJECT_NAME}" # displayed in game selection
        # ICON_PATH
        # BACKGROUND_PATH
        # PREVIEW_PATH
    )
endif()

main.c

#include <SDL.h>

#define WIDTH 320
#define HEIGHT 272

int main(int argc, char* argv[])
{
    SDL_Window* window = NULL;
    SDL_Renderer* renderer = NULL;
    SDL_Texture* texture = NULL;
    Uint32 pixel_format_enum = 0;

    SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO | SDL_INIT_HAPTIC | SDL_INIT_GAMECONTROLLER);


    window = SDL_CreateWindow("a", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 480, 272, SDL_WINDOW_FULLSCREEN);
    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);

    // PSP: BGR565 (4bpp)
    pixel_format_enum = SDL_GetWindowPixelFormat(window);

    // create texture of same window format so SDL doesn't
    // have to do potential sw-side converting
    texture = SDL_CreateTexture(renderer, pixel_format_enum, SDL_TEXTUREACCESS_STREAMING, WIDTH, HEIGHT);

    while (1)
    {
        SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0xFF);
        SDL_RenderClear(renderer);

        // render a stripe, however this breaks on ppsspp
        // PSP: pitch = 512 (so extra 192 byte of padding...odd)
        void* pixels = NULL; int pitch = 0;
        SDL_LockTexture(texture, NULL, &pixels, &pitch);
            for (int i = 0; i < HEIGHT; i++)
            {
                // alternate between white and black on each scanline
                const int colour = i&1?0xFF:0x00;

                SDL_memset((uint8_t*)pixels + (i * pitch), colour, pitch);
            }
        SDL_UnlockTexture(texture);


        SDL_RenderCopy(renderer, texture, NULL, NULL);
        SDL_RenderPresent(renderer);
    }

    SDL_Quit();

    return 0;
}