2 backgrounds 1 scrolling

[RensLensvelt]

I'm trying to get 2 backgrounds, one on the top screen and one on the bottom.
The bottomscreen has to scroll.

When i use this code the bottom screen seems to 'crash' it shows half of the image, but then double...

Code: Select all

#include <nds.h>
#include <stdio.h>
#include <stdlib.h>

#include "kaart.h"
#include "logo.h"


int main(void) {
   int keys = 0;
   int tx = 0;
         
   touchPosition touch;
   

   vramSetBankA(VRAM_A_MAIN_BG);
   //vramSetBankB(VRAM_B_SUB_BG);
   
   
   videoSetMode(MODE_5_2D);
   videoSetModeSub(MODE_5_2D);
   
   int TopScherm = bgInit(3, BgType_Bmp16, BgSize_B16_256x256, 0,0);
   bgSetPriority(TopScherm,3);   
   decompress(logoBitmap, BG_GFX,  LZ77Vram);
     
   int BtmScherm = bgInitSub(3, BgType_Bmp16, BgSize_B16_512x256, 0,0);
   bgSetPriority(BtmScherm,3);
   decompress(kaartBitmap, BG_GFX_SUB,  LZ77Vram);
   
   bgUpdate();
}

[zeromus]

your game doesnt go into a loop. whatever it does, it only does once, and then the program exits. this is bogus.

[RensLensvelt]

Sorry, didn't know you would need everything

this is the code so far

Code: Select all

#include <nds.h>
#include <stdio.h>
#include <stdlib.h>

#include "kaart.h"
#include "logo.h"
#include "slider.h"
#include "dekantine.h"
#include "schuur2.h"
#include "schuur.h"




int main(void) {
   int keys = 0;
   //int sx = 0;
   int sy = 0;
   int tx = 0;
   int geselecteerd = 0;
         
   touchPosition touch;
   

   vramSetBankA(VRAM_A_MAIN_BG);
   //vramSetBankB(VRAM_B_SUB_BG);
   
   
   videoSetMode(MODE_5_2D);
   videoSetModeSub(MODE_5_2D);
   
   int TopScherm = bgInit(3, BgType_Bmp16, BgSize_B16_256x256, 0,0);
   bgSetPriority(TopScherm,3);   
   decompress(logoBitmap, BG_GFX,  LZ77Vram);
     
   int BtmScherm = bgInitSub(3, BgType_Bmp16, BgSize_B16_512x256, 0,0);
   bgSetPriority(BtmScherm,3);
   decompress(kaartBitmap, BG_GFX_SUB,  LZ77Vram);
   
   bgUpdate();
   


   while(!(keys & KEY_B))
   {
      scanKeys();

      keys = keysHeld();

      // if(keys & KEY_UP) sy--;
      // if(keys & KEY_DOWN) sy++;
      // if(keys & KEY_LEFT) sx--;
      // if(keys & KEY_RIGHT) sx++;
	  if(geselecteerd == 1) {
		if(keys & KEY_UP and sy > 0 ) sy--;
		if(keys & KEY_DOWN and sy < 64 ) sy++;
		};
	  //if(keys & KEY_LEFT) decompress(schuur2Bitmap, BG_GFX,  LZ77Vram);
	  //if(keys & KEY_RIGHT) decompress(schuurBitmap, BG_GFX,  LZ77Vram);
	  //if(keys & KEY_A) decompress(logoBitmap, BG_GFX,  LZ77Vram);
	  
        
		touchRead(&touch);
		swiWaitForVBlank();
		
		if (touch.px > 1 and touch.py > 140) tx = touch.px;
		
		if (touch.px >  20-tx and touch.px <  50-tx and touch.py >20 and touch.py < 50) {decompress(sliderBitmap, BG_GFX,  LZ77Vram); geselecteerd = 1;};
		if (touch.px >  80-tx and touch.px < 110-tx and touch.py >30 and touch.py < 60) {decompress(dekantineBitmap, BG_GFX,  LZ77Vram); geselecteerd = 1;};
		if (touch.px > 140-tx and touch.px < 170-tx and touch.py >40 and touch.py < 70) {decompress(schuur2Bitmap, BG_GFX,  LZ77Vram); geselecteerd = 1;};
		if (touch.px > 250-tx and touch.px < 280-tx and touch.py >50 and touch.py < 80) {decompress(schuurBitmap, BG_GFX,  LZ77Vram); geselecteerd = 1;};
		if (touch.px > 320-tx and touch.px < 350-tx and touch.py >60 and touch.py < 90) {decompress(logoBitmap, BG_GFX,  LZ77Vram); geselecteerd = 1;};
				
		
		bgSetScroll(BtmScherm, tx, 0);
		bgSetScroll(TopScherm, 0, sy);
		bgUpdate();
		   
	}

	return 0;

}

[zeromus]

do you know what touch.px are and touch.py are when the stylus _isnt_ being pressed? maybe theyre values which confuse your program.

"seems to 'crash' it shows half of the image, but then double..." doesnt make much sense. if you upload the zip of your entire project then this could be 100% debugged.

[RensLensvelt]

Here are 2 images.

The first is the map like i want to show it (png) I've put in some red blocks to make my problem more clear.
The second is a photo of the NDS running the program.