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#include <SDL2/SDL.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#define FBGL_SHM_KEY 0x1234FBCD
#define FBGL_WIDTH 800
#define FBGL_HEIGHT 600
#define FBGL_SIZE (FBGL_WIDTH * FBGL_HEIGHT * 4)
int main(void) {
printf("FBGL Viewer - Connecting to shared memory...\n");
// Attach to shared memory
int shm_id = shmget(FBGL_SHM_KEY, FBGL_SIZE, 0666);
if (shm_id < 0) {
fprintf(stderr, "Error: Cannot access shared memory (key: 0x%08X)\n", FBGL_SHM_KEY);
fprintf(stderr, "Make sure the FBGL program is running first!\n");
return 1;
}
void* shared_mem = shmat(shm_id, NULL, SHM_RDONLY);
if (shared_mem == (void*)-1) {
fprintf(stderr, "Error: Cannot attach to shared memory\n");
return 1;
}
printf("Connected to shared memory (SHM ID: %d)\n", shm_id);
// Initialize SDL
if (SDL_Init(SDL_INIT_VIDEO) < 0) {
fprintf(stderr, "SDL Init failed: %s\n", SDL_GetError());
shmdt(shared_mem);
return 1;
}
SDL_Window* window = SDL_CreateWindow("FBGL Viewer",
SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED,
FBGL_WIDTH, FBGL_HEIGHT, SDL_WINDOW_SHOWN);
if (!window) {
fprintf(stderr, "Window creation failed: %s\n", SDL_GetError());
SDL_Quit();
shmdt(shared_mem);
return 1;
}
SDL_Renderer* renderer = SDL_CreateRenderer(window, -1,
SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC);
SDL_Texture* texture = SDL_CreateTexture(renderer,
SDL_PIXELFORMAT_ARGB8888, SDL_TEXTUREACCESS_STREAMING,
FBGL_WIDTH, FBGL_HEIGHT);
printf("FBGL Viewer running at %dx%d\n", FBGL_WIDTH, FBGL_HEIGHT);
printf("Press ESC or close window to exit.\n");
int running = 1;
SDL_Event event;
Uint32 frame_count = 0;
Uint32 last_time = SDL_GetTicks();
while (running) {
while (SDL_PollEvent(&event)) {
if (event.type == SDL_QUIT ||
(event.type == SDL_KEYDOWN && event.key.keysym.sym == SDLK_ESCAPE)) {
running = 0;
}
}
// Update texture with framebuffer data
SDL_UpdateTexture(texture, NULL, shared_mem, FBGL_WIDTH * 4);
SDL_RenderClear(renderer);
SDL_RenderCopy(renderer, texture, NULL, NULL);
SDL_RenderPresent(renderer);
// Calculate FPS every second
frame_count++;
Uint32 current_time = SDL_GetTicks();
if (current_time - last_time >= 1000) {
char title[256];
snprintf(title, sizeof(title), "FBGL Viewer - %u FPS", frame_count);
SDL_SetWindowTitle(window, title);
frame_count = 0;
last_time = current_time;
}
SDL_Delay(16); // ~60 FPS
}
printf("Shutting down...\n");
SDL_DestroyTexture(texture);
SDL_DestroyRenderer(renderer);
SDL_DestroyWindow(window);
SDL_Quit();
shmdt(shared_mem);
return 0;
}
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