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vram direct access and pitch

 
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Atenus



Joined: 05 Nov 2006
Posts: 9
Location: Argentina
PostPosted: Tue Nov 21, 2006 7:35 am    Post subject: vram direct access and pitch Reply with quote
im accessing vram directly thrugh 0x44000000, but the problem is that i dont know the pitch, so supouse i want to make a code to fill all screen with an RGB color:

Code:

sceDisplaySetMode(0, 480, 272);

int * p_vram = (int *) 0x44000000;

    sceDisplaySetFrameBuf((void *)p_vram, 480,
         PSP_DISPLAY_PIXEL_FORMAT_8888,
         PSP_DISPLAY_SETBUF_IMMEDIATE);

int color;
   
               color = RGB(0xFF,0,0);
   
   for (int i = 0; i < 272 ; i++)
   {

       for (int j = 0; j < 480; j++)
       {
          *p_vram = color;
          p_vram++;
       }
   
      p_vram += PITCH_VALUE;
   }


where:

- RGB() macro is one for creating an int rgb color passing the three bytes values.
- PITCH_VALUE should be the amout of (bytes / 4) to get the address of the next row.

I have been trying to figure out what value could be the pitch, but no results.

any help?
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Raphael



Joined: 17 Jan 2006
Posts: 646
Location: Germany
PostPosted: Tue Nov 21, 2006 8:44 am    Post subject: Reply with quote
It should be 512. Well, 512-480 in your case actually
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Atenus



Joined: 05 Nov 2006
Posts: 9
Location: Argentina
PostPosted: Tue Nov 21, 2006 10:31 am    Post subject: Reply with quote
thanks a lot
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