nitro-engine/examples/loading/filesystem_multiple_textures_bmp/source/main.c

// SPDX-License-Identifier: CC0-1.0
//
// SPDX-FileContributor: Antonio Niño Díaz, 2008-2011, 2019, 2022
//
// This file is part of Nitro Engine

#include <stdbool.h>

#include <filesystem.h>

#include <NEMain.h>

// To use this example you have to patch the NDS ROM with DLDI and copy
// nitro-engine folder to the root of your card.
//
// It will load the two BMPs and you will be able to take a screenshot.

NE_Camera *Camera;
NE_Model *Model;
NE_Material *OpaqueMaterial, *TransparentMaterial;

void Draw3DScene(void)
{
    NE_CameraUse(Camera);

    NE_PolyFormat(31, 0, NE_LIGHT_0, NE_CULL_NONE, 0);
    NE_ModelDraw(Model);
}

int main(void)
{
    irqEnable(IRQ_HBLANK);
    irqSet(IRQ_VBLANK, NE_VBLFunc);
    irqSet(IRQ_HBLANK, NE_HBLFunc);

    NE_Init3D();
    // libnds uses VRAM_C for the text console, reserve A and B only
    NE_TextureSystemReset(0, 0, NE_VRAM_AB);
    // Init console in non-3D screen
    consoleDemoInit();

    if (!nitroFSInit(NULL))
    {
        iprintf("nitroFSInit failed.\nPress START to exit");
        while (1)
        {
            swiWaitForVBlank();
            scanKeys();
            if (keysHeld() & KEY_START)
                return 0;
        }
    }

    // Allocate space for objects...
    Model = NE_ModelCreate(NE_Static);
    Camera = NE_CameraCreate();
    OpaqueMaterial = NE_MaterialCreate();
    TransparentMaterial = NE_MaterialCreate();

    // Setup camera
    NE_CameraSet(Camera,
                 -2, -2, -2,
                  0, 0, 0,
                  0, 1, 0);

    // Load things from FAT
    NE_ModelLoadStaticMeshFAT(Model, "cube.bin");
    NE_FATMaterialTexLoadBMPtoRGBA(TransparentMaterial, "bmp16bit_x1rgb5.bmp", 1);
    NE_FATMaterialTexLoadBMPtoRGBA(OpaqueMaterial, "bmp24bit.bmp", 0);

    // Assign material to model
    NE_ModelSetMaterial(Model, TransparentMaterial);

    // Set up light
    NE_LightSet(0, NE_White, 0, -1, -1);

    // Background color
    NE_ClearColorSet(NE_Gray, 31, 63);

    // Reduce size of the cube, the original model is 7.5 x 7.5 x 7.5
    NE_ModelScale(Model, 0.3, 0.3, 0.3);

    while (1)
    {
        scanKeys(); //Get keys information...
        uint32 keys = keysDown();

        if (keys & KEY_START)
            return 0;

        // Change material if pressed
        if (keys & KEY_B)
            NE_ModelSetMaterial(Model, OpaqueMaterial);
        if (keys & KEY_A)
            NE_ModelSetMaterial(Model, TransparentMaterial);

        printf("\x1b[0;0HA/B: Change material.\n\nSTART: Exit.");

        // Increase rotation, you can't get the rotation angle after
        // this. If you want to know always the angle, you should use
        // NE_ModelSetRot().
        NE_ModelRotate(Model, 1, 2, 0);

        // Draw scene...
        NE_Process(Draw3DScene);
        NE_WaitForVBL(0);
    }

    return 0;
}