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roland

Joined: 11 Feb 2006
Posts: 13

Posted: Sun Apr 30, 2006 11:01 pm Post subject: sceGuGetMemory Question

Hi

I was wondering if anyone here could help me..

I am trying to draw 40x22 Faces on the Screen and I can not get it to work.. It works fine with 32x18 and I strongly think I am simply having Memory allocation Problems:

Code:

#define FACE_MAX_W 40
#define FACE_MAX_H 22

typedef struct Vertex_Color
{
unsigned int color;
float x,y,z;
} Vertex_Color;

face_horizGridStep = FACE_MAX_W;
face_vertiGridStep = FACE_MAX_H;

int res_horizStep = SCR_WIDTH/face_horizGridStep;
int res_vertiStep = SCR_HEIGHT/face_vertiGridStep;

Vertex_Color * faces = (struct Vertex_Color*)sceGuGetMemory(face_horizGridStep*face_vertiGridStep*6*sizeof(Vertex_Color));

// Build the grid
int counter = 0;
int intcnt = 0;

for (x = 0; x < face_horizGridStep; x++)
{
   for (y = 0; y < face_vertiGridStep; y++)
   {
      faces[counter].color = GU_ABGR(0xff,0,0,0);
      faces[counter].x = (x * res_horizStep)+(intensity_map[intcnt]/4);
      faces[counter].y = (y * res_vertiStep)+(intensity_map[intcnt]/4);
      faces[counter++].z = 0;

      faces[counter].color = GU_ABGR(0xff,0,0,0);
      faces[counter].x = ((x + 1) * res_horizStep)-(intensity_map[intcnt]/4);
      faces[counter].y = (y * res_vertiStep)+(intensity_map[intcnt]/4);
      faces[counter++].z = 0;

      faces[counter].color = GU_ABGR(0xff,0,0,0);
      faces[counter].x = (x * res_horizStep)+(intensity_map[intcnt]/4);
      faces[counter].y = ((y + 1) * res_vertiStep)-(intensity_map[intcnt]/4);
      faces[counter++].z = 0;

      faces[counter].color = GU_ABGR(0xff,0,0,0);
      faces[counter].x = ((x + 1) * res_horizStep)-(intensity_map[intcnt]/4);
      faces[counter].y = (y * res_vertiStep)+(intensity_map[intcnt]/4);
      faces[counter++].z = 0;

      faces[counter].color = GU_ABGR(0xff,0,0,0);
      faces[counter].x = ((x + 1) * res_horizStep)-(intensity_map[intcnt]/4);
      faces[counter].y = ((y + 1) * res_vertiStep)-(intensity_map[intcnt]/4);
      faces[counter++].z = 0;

      faces[counter].color = GU_ABGR(0xff,0,0,0);
      faces[counter].x = (x * res_horizStep)+(intensity_map[intcnt]/4);
      faces[counter].y = ((y +1) * res_vertiStep)-(intensity_map[intcnt]/4);
      faces[counter++].z = 0;
      intcnt++;
   }
}

sceGumDrawArray(GU_TRIANGLES,GU_COLOR_8888|GU_VERTEX_32BITF|GU_TRANSFORM_2D,counter,0,faces);

sceGuGetMemory in this case is allocting 40*22*6*16 = 84480 Bytes which should by ok right?!?

The Max List Size (if that is of any concern here, I am quite unsure!) is the usual with 262144 (from the Samples)..

is sceGuGetMemory allocating in VRAM or standard RAM? How much is there to allocate and what's the maximum that can be done!?

Your help is greatly appreciated

Roland

dot_blank

Joined: 28 Sep 2005
Posts: 498
Location: Brasil

Posted: Mon May 01, 2006 3:51 pm Post subject:

Code:

Vertex_Color * faces = (struct Vertex_Color*)sceGuGetMemory(face_horizGridStep*face_vertiGridStep*6*sizeof(Vertex_Color));

you define as a new type of Vertex_Color so you do not need the struct keyword for above casting

and just some notes:

Code:

void* sceGuGetMemory ( int size );

Note:
This function is NOT for permanent memory allocation, the memory will be invalid as soon as you start filling the same display list again.
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