程式語言 - Simple DirectMedia Layer (SDL) - v2.0 - C/C++ - Create Surface from Pixels

參考資訊：
https://wiki.libsdl.org/FrontPage

main.c

#include <stdio.h>
#include <stdlib.h>
#include <SDL.h>

#define W 32
#define H 24
   
int main(int argc, char **argv)
{
    int x = 0;
    int y = 0;
    const int w = 320;
    const int h = 240;
    const int bpp = 16;
    uint16_t buf[W * H] = { 0 };
    SDL_Window *window = NULL;
    SDL_Surface *screen = NULL;
    SDL_Texture *texture = NULL;
    SDL_Renderer *renderer = NULL;
 
    SDL_Init(SDL_INIT_VIDEO);
    window = SDL_CreateWindow("main", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, w, h, SDL_WINDOW_SHOWN);
    renderer = SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
    screen = SDL_CreateRGBSurface(0, w, h, bpp, 0, 0, 0, 0);
    texture = SDL_CreateTexture(renderer, SDL_PIXELFORMAT_RGB565, SDL_TEXTUREACCESS_STREAMING, w, h);
 
    for (y = 0; y < H; y++) {
        for (x = 0; x < W; x++) {
            if (y < 8) {
                buf[(y * W) + x] = 0xf800;
            }
            else if (y < 16) {
                buf[(y * W) + x] = 0x7e0;
            }
            else {
                buf[(y * W) + x] = 0x1f;
            }
        }
    }
 
    SDL_Surface *t = SDL_CreateRGBSurfaceFrom(
        buf,
        W,
        H,
        16,
        W * sizeof(uint16_t),
        screen->format->Rmask,
        screen->format->Gmask,
        screen->format->Bmask,
        screen->format->Amask
    );

    SDL_BlitScaled(t, NULL, screen, NULL);
    SDL_FreeSurface(t);
 
    SDL_UpdateTexture(texture, NULL, screen->pixels, screen->pitch);
    SDL_RenderClear(renderer);
    SDL_RenderCopy(renderer, texture, NULL, NULL);
    SDL_RenderPresent(renderer);
 
    SDL_Delay(3000);
 
    SDL_FreeSurface(screen);
    SDL_DestroyTexture(texture);
    SDL_DestroyRenderer(renderer);
    SDL_DestroyWindow(window);
    SDL_Quit();
    return 0;
}

編譯、執行

$ gcc main.c -o main -lSDL2 -I/usr/include/SDL2
$ ./main