[feature] an emulator for viewing fbgl programs

1 files changed, 41 insertions, 0 deletions

diff --git a/emu/fbgl_preload.h b/emu/fbgl_preload.h
new file mode 100644
index 0000000..e736943
--- /dev/null
+++ b/emu/fbgl_preload.h
@@ -0,0 +1,41 @@
+#ifndef FBGL_PRELOAD_H
+#define FBGL_PRELOAD_H
+
+#include <stddef.h>
+#include <sys/types.h>
+
+// Framebuffer configuration
+#define FBGL_SHM_KEY     0x1234FBCD
+#define FBGL_WIDTH       800
+#define FBGL_HEIGHT      600
+#define FBGL_BPP         32
+#define FBGL_BYTES_PP    (FBGL_BPP / 8)
+#define FBGL_PITCH       (FBGL_WIDTH * FBGL_BYTES_PP)
+#define FBGL_SIZE        (FBGL_PITCH * FBGL_HEIGHT)
+
+// Virtual framebuffer file descriptor magic number
+#define FBGL_VIRTUAL_FD  1000
+
+// Framebuffer state structure
+typedef struct {
+    int virtual_fd;          // Virtual file descriptor for /dev/fb0
+    void* shared_mem;        // Pointer to shared memory
+    int shm_id;              // Shared memory ID
+    int is_initialized;      // Initialization flag
+    size_t total_writes;     // Statistics: number of writes
+    size_t bytes_written;    // Statistics: total bytes written
+} fbgl_state_t;
+
+// Original function pointers structure
+typedef struct {
+    int (*open)(const char*, int, ...);
+    int (*close)(int);
+    int (*ioctl)(int, unsigned long, ...);
+    void* (*mmap)(void*, size_t, int, int, int, off_t);
+    int (*munmap)(void*, size_t);
+    ssize_t (*write)(int, const void*, size_t);
+    ssize_t (*read)(int, void*, size_t);
+} fbgl_original_funcs_t;
+
+
+#endif // FBGL_PRELOAD_H