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Nintendo DS Development Tutorial :: Examples :: Splash Screen Effect

Here's an example of how to do a splash screen effect.  It's kind of a hack, but I think you'll get the idea.  Oh, and this code will run at a good speed on real hardware but quite slow in most emulators.

// Includes
#include <PA9.h>       // Include for PA_Lib

// Graphics Includes
// gfx2gba -fsrc -m -pBackground.pal -t8 Background.bmp
#include "gfx/Splash1.map.c"
#include "gfx/Splash1.raw.c"
#include "gfx/Splash1.pal.c"

// Function: main()
int main(int argc, char ** argv)
{
    // Variables
    s8 state = 0;   // 0 = fade in; 1 = wait; 2 = fade out;
    s8 counter = 0; // Just a counter
    s8 bl = -32;    // Brightness Level

    PA_Init();    // Initializes PA_Lib
    PA_InitVBL(); // Initializes a standard VBL

    //PA_LoadSplash();  // PA_Lib splash screen

    PA_LoadPal(PAL_BG0, Splash1_Palette);

    PA_LoadSimpleBg(0, 3, Splash1_Tiles, Splash1_Map, BG_256X256, 0, 1);

    // Infinite loop to keep the program running
    while (1)
    {
        // Game States
        switch (state) {
            case 0: // Fade In
                if (bl < 1) bl+=1;
                if (bl == 0) state = 1;
                break;
            case 1: // Wait
                counter+=1;
                if (counter == 40) state = 2;
                break;
            case 2: // Fade Out
                if (bl > -32) bl-=1;
                if (bl == -32) state = 3;
                break;
            default:
                break;
        }

        PA_SetBrightness(0, bl);

        PA_WaitForVBL();
    }

    return 0;
} // End of main()
            

Code Explanation

switch(...)
This could have been a series of if/then's, but I like switch statements more.  The second  argument passed to PA_SetBrightness() is the brightness level and it ranges from -32 (black) to 32 (white).  I start out by setting it to -32 and then increment it to 0 (neutral) during the 'fade in' gamestate.  After pausing for a few seconds, control is then passed to the 'fade out' gamestate and the brightness level variable gets decremented back to -32.

PA_SetBrightness(screen, bright);
Sets the brightness level (-32 to 32) of screen (0 or 1).

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Splash_Screen

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