graphics/gpu/gpusprites/source/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 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
    spriteSheet = C2D_SpriteSheetLoad("romfs:/gfx/sprites.t3x");
    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);
 
        // 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;
}