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GU troubles #1

 
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pegasus2000



Joined: 12 Jul 2006
Posts: 160
PostPosted: Mon Aug 04, 2008 2:47 am    Post subject: GU troubles #1 Reply with quote
For all users that are experts of PSP GU. Please see this code:

Code:
#define ND_NO_INITIAL_MINWINDOWSBAR
#include <nanodesktop.h>

void *fbp0, *fbp1, *zbp;
extern unsigned int __attribute__((aligned(16))) ndlist[262144];

char ndGFXRenderingInProgress = 0;


#define BUF_WIDTH (512)
#define SCR_WIDTH (480)
#define SCR_HEIGHT (272)

static unsigned int staticOffset = 0;

static unsigned int getMemorySize(unsigned int width, unsigned int height, unsigned int psm)
{
   switch (psm)
   {
      case GU_PSM_T4:
         return (width * height) >> 1;

      case GU_PSM_T8:
         return width * height;

      case GU_PSM_5650:
      case GU_PSM_5551:
      case GU_PSM_4444:
      case GU_PSM_T16:
         return 2 * width * height;

      case GU_PSM_8888:
      case GU_PSM_T32:
         return 4 * width * height;

      default:
         return 0;
   }
}

void* getStaticVramBuffer(unsigned int width, unsigned int height, unsigned int psm)
{
   unsigned int memSize = getMemorySize(width,height,psm);
   void* result = (void*)staticOffset;
   staticOffset += memSize;

   return result;
}

void* getStaticVramTexture(unsigned int width, unsigned int height, unsigned int psm)
{
   void* result = getStaticVramBuffer(width,height,psm);
   return (void*)(((unsigned int)result) + ((unsigned int)sceGeEdramGetAddr()));
}


struct Vertex
{
   float x,y,z;
};

struct Vertex __attribute__((aligned(16))) vertices [1];


int ndHAL_EnableGFXEngine ()
{
    // setup GU

   fbp0 = getStaticVramBuffer(BUF_WIDTH,SCR_HEIGHT,GU_PSM_5551);
   fbp1 = getStaticVramBuffer(BUF_WIDTH,SCR_HEIGHT,GU_PSM_5551);
   zbp = getStaticVramBuffer(BUF_WIDTH,SCR_HEIGHT,GU_PSM_4444);

   sceGuInit();

   sceGuStart(GU_DIRECT,ndlist);
   sceGuDrawBuffer(GU_PSM_5551,fbp0,BUF_WIDTH);
   sceGuDispBuffer(SCR_WIDTH,SCR_HEIGHT,fbp1,BUF_WIDTH);
   sceGuDepthBuffer(zbp,BUF_WIDTH);
   sceGuOffset(2048 - (SCR_WIDTH/2),2048 - (SCR_HEIGHT/2));
   sceGuViewport(2048,2048,SCR_WIDTH,SCR_HEIGHT);
   sceGuDepthRange(65535,0);
   sceGuScissor(0,0,SCR_WIDTH,SCR_HEIGHT);
   sceGuEnable(GU_SCISSOR_TEST);
   sceGuFinish();
   sceGuSync(0,0);

   sceDisplayWaitVblankStart();
   sceGuDisplay(GU_TRUE);
   
   ndGFXRenderingInProgress=0;
}

int ndHAL_TerminateGFXEngine ()
{
    sceGuTerm();
}

int ndGFX_ClearScreen ()
{
    sceGuClearColor(0);
    sceGuClear(GU_COLOR_BUFFER_BIT);
}

inline void ndGFX_BeginRender ()
{
    if (!ndGFXRenderingInProgress)
    {
       sceGuStart(GU_DIRECT,ndlist);   
       ndGFXRenderingInProgress=1;
    }
}

inline void ndGFX_CompleteRender ()
{
    if (ndGFXRenderingInProgress)
    {
        sceGuFinish();
        sceGuSync(0,0);
   
        sceDisplayWaitVblankStart();
        sceGuSwapBuffers();
       
        ndGFXRenderingInProgress=0;   
    }
}



int ndGFX_DrawPixel (short int PosX, short int PosY, short int PosZ, TypeColor Color, char RenderNow)
{
    if (RenderNow) ndGFX_BeginRender();
   
    sceGuColor(0xFFFFFFFF);

    vertices [0].x = PosX;
    vertices [0].y = PosY;
    vertices [0].z = PosZ;

    sceGuDrawArray(GU_POINTS,GU_VERTEX_32BITF|GU_TRANSFORM_2D,1,0,vertices);
   
    if (RenderNow) ndGFX_CompleteRender ();
}


int ndMain ()
{
    ndInitSystem ();
    ndHAL_EnableGFXEngine ();
    ndGFX_ClearScreen ();
   
    int Counter;
   
    for (Counter=0; Counter<100; Counter++)
    {
        ndGFX_DrawPixel (Counter, 50, 0, COLOR_WHITE, 1);
    }
}



I'm expecting a single orizzontal line of the screen.
Instead, the system gives me a set of **separated** points.

Why ?


A second thing. It seems that GU is a 3d engine only, so all pixel
has always 3 dimensions-coordinates (x,y,z). Am I wrong ?

There isn't a 2D mode in PSP-GU ?
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a_noob



Joined: 17 Sep 2006
Posts: 97
Location: _start: jr 0xDEADBEEF
PostPosted: Mon Aug 04, 2008 6:09 am    Post subject: Reply with quote
the GU is plenty capable of 2D, but yes draw array must always contain z. (this is due to how the GE works)

For drawing a line you should create 2 points, and use the GU_LINES primitive, as it is much faster than drawing each pixel. Also I may be wrong but the if(RenderNow) may be causing the problem.

Also it is a big mistake to open and close a GU display list every time you render, this causes alot of unneccasary over head. Rather open a display list call all renderings, then close it.

also in the ndGFX_BeginRender the if (ndGFXRenderingInPRogress) is more than likely what is causing the pixel skips as the GU/GE isnt completely in sync with the CPU, so the overhead caused by opening and closing , along with the CPU telling to render things while it is still trying to complete another list is what is causing your pixel drop.

heres the fixed code

Code:

#define ND_NO_INITIAL_MINWINDOWSBAR
#include <nanodesktop.h>

void *fbp0, *fbp1, *zbp;
extern unsigned int __attribute__((aligned(16))) ndlist[262144];

char ndGFXRenderingInProgress = 0;


#define BUF_WIDTH (512)
#define SCR_WIDTH (480)
#define SCR_HEIGHT (272)

static unsigned int staticOffset = 0;

static unsigned int getMemorySize(unsigned int width, unsigned int height, unsigned int psm)
{
   switch (psm)
   {
      case GU_PSM_T4:
         return (width * height) >> 1;

      case GU_PSM_T8:
         return width * height;

      case GU_PSM_5650:
      case GU_PSM_5551:
      case GU_PSM_4444:
      case GU_PSM_T16:
         return 2 * width * height;

      case GU_PSM_8888:
      case GU_PSM_T32:
         return 4 * width * height;

      default:
         return 0;
   }
}

void* getStaticVramBuffer(unsigned int width, unsigned int height, unsigned int psm)
{
   unsigned int memSize = getMemorySize(width,height,psm);
   void* result = (void*)staticOffset;
   staticOffset += memSize;

   return result;
}

void* getStaticVramTexture(unsigned int width, unsigned int height, unsigned int psm)
{
   void* result = getStaticVramBuffer(width,height,psm);
   return (void*)(((unsigned int)result) + ((unsigned int)sceGeEdramGetAddr()));
}


struct Vertex
{
   float x,y,z;
};

struct Vertex __attribute__((aligned(16))) vertices [2];


int ndHAL_EnableGFXEngine ()
{
    // setup GU

   fbp0 = getStaticVramBuffer(BUF_WIDTH,SCR_HEIGHT,GU_PSM_5551);
   fbp1 = getStaticVramBuffer(BUF_WIDTH,SCR_HEIGHT,GU_PSM_5551);
   zbp = getStaticVramBuffer(BUF_WIDTH,SCR_HEIGHT,GU_PSM_4444);

   sceGuInit();

   sceGuStart(GU_DIRECT,ndlist);
   sceGuDrawBuffer(GU_PSM_5551,fbp0,BUF_WIDTH);
   sceGuDispBuffer(SCR_WIDTH,SCR_HEIGHT,fbp1,BUF_WIDTH);
   sceGuDepthBuffer(zbp,BUF_WIDTH);
   sceGuOffset(2048 - (SCR_WIDTH/2),2048 - (SCR_HEIGHT/2));
   sceGuViewport(2048,2048,SCR_WIDTH,SCR_HEIGHT);
   sceGuDepthRange(65535,0);
   sceGuScissor(0,0,SCR_WIDTH,SCR_HEIGHT);
   sceGuEnable(GU_SCISSOR_TEST);
   sceGuFinish();
   sceGuSync(0,0);

   sceDisplayWaitVblankStart();
   sceGuDisplay(GU_TRUE);
   
   ndGFXRenderingInProgress=0;
}

int ndHAL_TerminateGFXEngine ()
{
    sceGuTerm();
}

int ndGFX_ClearScreen ()
{
    sceGuClearColor(0);
    sceGuClear(GU_COLOR_BUFFER_BIT);
}

inline void ndGFX_BeginRender ()
{
       sceGuStart(GU_DIRECT,ndlist);   
}

inline void ndGFX_CompleteRender ()
{
    sceGuFinish();
        sceGuSync(0,0);
   
        sceDisplayWaitVblankStart();
        sceGuSwapBuffers();

}



int ndGFX_DrawPixel (short int PosX, short int PosY, short int PosZ, TypeColor Color, char RenderNow)
{
   
    sceGuColor(0xFFFFFFFF);

    vertices [0].x = PosX;
    vertices [0].y = PosY;
    vertices [0].z = PosZ;

    sceGuDrawArray(GU_POINTS,GU_VERTEX_32BITF|GU_TRANSFORM_2D,1,0,vertices);
}

int ndGFX_DrawLine (short int PosX, short int PosY, short int PosZ, short int Pos2X, short int Pos2Y, short int Pos2Z, TypeColor Color, char RenderNow)
{
   
    sceGuColor(0xFFFFFFFF);

    vertices [0].x = PosX;
    vertices [0].y = PosY;
    vertices [0].z = PosZ;

    vertices [1].x = Pos2X;
    vertices [1].y = Pos2Y;
    vertices [1].z = Pos2Z;

    sceGuDrawArray(GU_LINES,GU_VERTEX_32BITF|GU_TRANSFORM_2D,2,0,vertices);
}

int ndMain ()
{
    ndInitSystem ();
    ndHAL_EnableGFXEngine ();
    ndGFX_ClearScreen ();
   
    int Counter;
   ndGFX_BeginRender();
   // per pixel render
    for (Counter=0; Counter<100; Counter++)
    {
        ndGFX_DrawPixel (Counter, 50, 0, COLOR_WHITE, 1);
    }
   //line render
   ndGFX_DrawLine (0,126,0, 480,126,0, COLOR_WHITE, 1);
   ndGFX_CompleteRender();
}


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