gpusprites example, but print out spritesheet load time

main.c

// Simple citro2d sprite drawing example
// Images borrowed from:
//   https://kenney.nl/assets/space-shooter-redux
#include <citro2d.h>

#include <assert.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define MAX_SPRITES   768
#define SCREEN_WIDTH  400
#define SCREEN_HEIGHT 240

// Simple sprite struct
typedef struct
{
  C2D_Sprite spr;
  float dx, dy; // velocity
} Sprite;

static C2D_SpriteSheet spriteSheet;
static Sprite sprites[MAX_SPRITES];
static size_t numSprites = MAX_SPRITES/2;

static TickCounter tickCounter;

//---------------------------------------------------------------------------------
static void initSprites() {
//---------------------------------------------------------------------------------
  size_t numImages = C2D_SpriteSheetCount(spriteSheet);
  srand(time(NULL));

  for (size_t i = 0; i < MAX_SPRITES; i++)
  {
    Sprite* sprite = &sprites[i];

    // Random image, position, rotation and speed
    C2D_SpriteFromSheet(&sprite->spr, spriteSheet, rand() % numImages);
    C2D_SpriteSetCenter(&sprite->spr, 0.5f, 0.5f);
    C2D_SpriteSetPos(&sprite->spr, rand() % SCREEN_WIDTH, rand() % SCREEN_HEIGHT);
    C2D_SpriteSetRotation(&sprite->spr, C3D_Angle(rand()/(float)RAND_MAX));
    sprite->dx = rand()*4.0f/RAND_MAX - 2.0f;
    sprite->dy = rand()*4.0f/RAND_MAX - 2.0f;
  }
}

//---------------------------------------------------------------------------------
static void moveSprites() {
//---------------------------------------------------------------------------------
  for (size_t i = 0; i < numSprites; i++)
  {
    Sprite* sprite = &sprites[i];
    C2D_SpriteMove(&sprite->spr, sprite->dx, sprite->dy);
    C2D_SpriteRotateDegrees(&sprite->spr, 1.0f);

    // Check for collision with the screen boundaries
    if ((sprite->spr.params.pos.x < sprite->spr.params.pos.w / 2.0f && sprite->dx < 0.0f) ||
      (sprite->spr.params.pos.x > (SCREEN_WIDTH-(sprite->spr.params.pos.w / 2.0f)) && sprite->dx > 0.0f))
      sprite->dx = -sprite->dx;

    if ((sprite->spr.params.pos.y < sprite->spr.params.pos.h / 2.0f && sprite->dy < 0.0f) ||
      (sprite->spr.params.pos.y > (SCREEN_HEIGHT-(sprite->spr.params.pos.h / 2.0f)) && sprite->dy > 0.0f))
      sprite->dy = -sprite->dy;
  }
}

//---------------------------------------------------------------------------------
int main(int argc, char* argv[]) {
//---------------------------------------------------------------------------------
  // Init libs
  romfsInit();
  gfxInitDefault();
  C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);
  C2D_Init(C2D_DEFAULT_MAX_OBJECTS);
  C2D_Prepare();
  consoleInit(GFX_BOTTOM, NULL);

  // Create screens
  C3D_RenderTarget* top = C2D_CreateScreenTarget(GFX_TOP, GFX_LEFT);

  // Load graphics
  osTickCounterStart(&tickCounter);
  spriteSheet = C2D_SpriteSheetLoad("romfs:/gfx/sprites.t3x");
  osTickCounterUpdate(&tickCounter);
  if (!spriteSheet) svcBreak(USERBREAK_PANIC);

  // Initialize sprites
  initSprites();

  printf("\x1b[8;1HPress Up to increment sprites");
  printf("\x1b[9;1HPress Down to decrement sprites");

  // Main loop
  while (aptMainLoop())
  {
    hidScanInput();

    // Respond to user input
    u32 kDown = hidKeysDown();
    if (kDown & KEY_START)
      break; // break in order to return to hbmenu

    u32 kHeld = hidKeysHeld();
    if ((kHeld & KEY_UP) && numSprites < MAX_SPRITES)
      numSprites++;
    if ((kHeld & KEY_DOWN) && numSprites > 1)
      numSprites--;

    moveSprites();

    printf("\x1b[1;1HSprites: %zu/%u\x1b[K", numSprites, MAX_SPRITES);
    printf("\x1b[2;1HCPU:     %6.2f%%\x1b[K", C3D_GetProcessingTime()*6.0f);
    printf("\x1b[3;1HGPU:     %6.2f%%\x1b[K", C3D_GetDrawingTime()*6.0f);
    printf("\x1b[4;1HCmdBuf:  %6.2f%%\x1b[K", C3D_GetCmdBufUsage()*100.0f);
    printf("\x1b[5;1HLoad time:  %6.2f\x1b[K", osTickCounterRead(&tickCounter));

    // Render the scene
    C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
    C2D_TargetClear(top, C2D_Color32f(0.0f, 0.0f, 0.0f, 1.0f));
    C2D_SceneBegin(top);
    for (size_t i = 0; i < numSprites; i ++)
      C2D_DrawSprite(&sprites[i].spr);
    C3D_FrameEnd(0);
  }

  // Delete graphics
  C2D_SpriteSheetFree(spriteSheet);

  // Deinit libs
  C2D_Fini();
  C3D_Fini();
  gfxExit();
  romfsExit();
  return 0;
}