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#include <incbin.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
INCBIN(APPLE, "data/apple.bin");
#define APPLE_WIDTH 480
#define APPLE_HEIGHT 360
#define APPLE_FPS 30
#define APPLE_FRAMES 6572
#define VSYNC_FPS 60
#define MIN(a, b) (((a) < (b)) ? (a) : (b))
// returned from drm
static uint32_t *fb;
static int width, height, bpp, scale;
size_t fb_size;
// decompress state
static size_t d_offset = 0, d_length = 0;
static unsigned char d_value;
// frame counter
static size_t last_frame = SIZE_MAX, frame = 0;
// frame buffer
static unsigned char frame_buf[APPLE_WIDTH * APPLE_HEIGHT];
// backbuffer
static uint32_t *back_fb;
// start tick
static size_t tick_start;
static unsigned char read_byte(void)
{
while (d_length < 1) {
unsigned char len;
d_length = 0;
do {
len = gAPPLEData[d_offset++];
d_length += len;
} while (len == 255);
d_value = gAPPLEData[d_offset++];
}
d_length--;
return d_value;
}
static void read_frame(void)
{
for (size_t i = 0; i < sizeof(frame_buf); i++)
frame_buf[i] = read_byte();
}
static void swap_buffers(void)
{
// terrible :3
uint32_t count = width * height / 2;
__asm__ volatile("rep movsq" ::"S"(back_fb), "D"(fb), "c"(count)
: "memory");
}
static void draw_frame(void)
{
for (int y = 0; y < APPLE_HEIGHT * scale; y++) {
for (int x = 0; x < APPLE_WIDTH * scale; x++) {
unsigned char color =
frame_buf[(x / scale) + (y / scale) * APPLE_WIDTH];
back_fb[x + y * width] = (color << 16) | (color << 8) |
(color << 0);
}
}
}
int main(void)
{
printf("all your apple belong to bad\n");
if (drm((void **)&fb, &width, &height, &bpp)) {
fprintf(stderr, "failure!\n");
return 1;
}
fb_size = (width * height * bpp) / 8;
back_fb = malloc(fb_size);
if (back_fb == NULL) {
fprintf(stderr, "failure but 2\n");
return 1;
}
tick_start = ticks();
scale = MIN(width / APPLE_WIDTH, height / APPLE_HEIGHT);
while (1) {
if (last_frame != frame) {
read_frame();
draw_frame();
swap_buffers();
}
last_frame = frame;
frame = ((ticks() - tick_start) / (1000 / APPLE_FPS));
if (frame >= APPLE_FRAMES)
break;
}
return 0;
}
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