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Nothing rendered with GU

 
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ffelagund



Joined: 16 Mar 2006
Posts: 14
PostPosted: Sun Jul 02, 2006 9:49 pm    Post subject: Nothing rendered with GU Reply with quote
Hello,

I have a "little" problem with gu. I'm trying to render something (a trinangle and some axis) but I canno't get anything rendered. Here is my code (baed on the samples of the sdk)
Code:

struct Vertex
{
   //float u,v;
   unsigned int color;
   float x,y,z;
};
#include "triangle.h"


PSP_MODULE_INFO("Triangle Sample", 0, 1, 1);
PSP_MAIN_THREAD_ATTR(THREAD_ATTR_USER);

static unsigned int __attribute__((aligned(16))) list[262144];

int initGU()
{
   // setup GU

   void* fbp0 = (void *)getStaticVramBuffer(BUF_WIDTH,SCR_HEIGHT,GU_PSM_8888);
   void* fbp1 = (void *)getStaticVramBuffer(BUF_WIDTH,SCR_HEIGHT,GU_PSM_8888);
   void* zbp  = (void *)getStaticVramBuffer(BUF_WIDTH,SCR_HEIGHT,GU_PSM_4444);

   sceGuInit();
   sceGuStart(GU_DIRECT,list);

   sceGuDrawBuffer(GU_PSM_8888,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);
   sceGuFrontFace(GU_CW);
   sceGuDisable(GU_CULL_FACE);
    sceGuShadeModel(GU_SMOOTH);
    sceGuEnable(GU_DEPTH_TEST);
    sceGuDepthFunc(GU_GEQUAL);
   
    /*sceGuDrawBuffer(GU_PSM_8888,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);
 sceGuDepthFunc(GU_GEQUAL);
 sceGuEnable(GU_DEPTH_TEST);
 sceGuFrontFace(GU_CW);
 sceGuShadeModel(GU_SMOOTH);*/

   sceGuClear(GU_COLOR_BUFFER_BIT|GU_DEPTH_BUFFER_BIT);
   sceGuFinish();
   sceGuSync(0,0);

   sceDisplayWaitVblankStart();
   sceGuDisplay(GU_TRUE);
   return 1;
}

int main(int argc, char* argv[])
{
   setupCallbacks();
   sceKernelDcacheWritebackAll();
   pspDebugScreenInit();
   initGU();
   
   struct Vertex* triangle = (struct Vertex*)sceGuGetMemory(3 * sizeof(struct Vertex));   
    struct Vertex* axes = (struct Vertex*)sceGuGetMemory(6 * sizeof(struct Vertex)); 
    triangle[0].x = 0; triangle[0].y = 272; triangle[0].z = 0;
    triangle[0].color = GU_RGBA(255,0,0,255);
    triangle[1].x = 240; triangle[1].y = 0; triangle[1].z = 0;
    triangle[1].color = GU_RGBA(0,255,0,255);           
    triangle[2].x = 480; triangle[2].y = 272; triangle[2].z = 0;
    triangle[2].color = GU_RGBA(0,0,255,255);
   
    axes[0].x = 0;         axes[0].y = 0;     axes[0].z = 0;
    axes[0].color = GU_RGBA(255,0,0,255);
    axes[1].x = 100000;    axes[1].y = 0;     axes[1].z = 0;
    axes[1].color = GU_RGBA(255,0,0,255);
   
    axes[2].x = 0;    axes[2].y = 0;          axes[2].z = 0;
    axes[2].color = GU_RGBA(0,255,0,255);
    axes[3].x = 0;    axes[3].y = 100000;     axes[3].z = 0;
    axes[3].color = GU_RGBA(0,255,0,255);
   
    axes[4].x = 0;    axes[4].y = 0;          axes[4].z = 0;
    axes[4].color = GU_RGBA(0,0,255,255);
    axes[5].x = 0;    axes[5].y = 0;          axes[5].z = 100000;
    axes[5].color = GU_RGBA(0,0,255,255);
     
   while(running())
   {
      sceGuStart(GU_DIRECT,list);   
       
        Render(triangle, axes);          
       
      sceGuFinish();
      sceGuSync(0,0);
      sceDisplayWaitVblankStart();
      sceGuSwapBuffers();
      pspDebugScreenSetXY(0,0);
   }
   

   sceGuTerm();
   sceKernelExitGame();
   return 0;
}

void Render(struct Vertex *triangle, struct Vertex *axes)
{
    sceGuClearColor(0xff00ff);
    sceGuClear(GU_COLOR_BUFFER_BIT|GU_DEPTH_BUFFER_BIT);

    sceGumMatrixMode(GU_PROJECTION);
    sceGumLoadIdentity();
    sceGumPerspective(45,480.0f/272.0f, 10, 1000);
   
    sceGumMatrixMode(GU_VIEW);
    sceGumLoadIdentity();
   
    sceGumDrawArray(GU_LINES,GU_COLOR_8888|GU_VERTEX_32BITF|GU_TRANSFORM_3D,6,0,axes);
    sceGumMatrixMode(GU_MODEL);
    sceGumLoadIdentity();   
   
    ScePspFVector3 pos  = {0,0,500};
    ScePspFVector3 view = {0,0,0};
    ScePspFVector3 up   = {0,1,0};
    sceGumLookAt(&pos,&view,&up);
   
   
    sceGumDrawArray(GU_LINES,GU_COLOR_8888|GU_VERTEX_32BITF|GU_TRANSFORM_3D,6,0,axes);
   
    static float angle = 0;
    sceGumRotateY(angle);
    angle += 1.0f;
    sceGumDrawArray(GU_TRIANGLES,GU_COLOR_8888|GU_VERTEX_32BITF|GU_TRANSFORM_3D,3,0,triangle);
}


Could anybody help me?

Thanks in advance,
Jacobo.
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ffelagund



Joined: 16 Mar 2006
Posts: 14
PostPosted: Mon Jul 03, 2006 2:50 am    Post subject: Reply with quote
I've dumped the content of the matrix generated by sceGumLookAt and it's all zeroes. Anybody could realize what I am doing wrong?

Edit: after called gumInit() at the begining I do not get more 0'matrices (they seem correct now), but things are still out of screen :(
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hardhat



Joined: 02 Mar 2006
Posts: 17
PostPosted: Mon Jul 03, 2006 3:31 pm    Post subject: Reply with quote
sceGetGuMemory doesn't do what you think it does. Try replacing:

Code:

 struct Vertex* triangle = (struct Vertex*)sceGuGetMemory(3 * sizeof(struct Vertex));   
    struct Vertex* axes = (struct Vertex*)sceGuGetMemory(6 * sizeof(struct Vertex)); 


with
Code:

 struct Vertex* triangle = (struct Vertex*)memalign(16,3 * sizeof(struct Vertex));   
    struct Vertex* axes = (struct Vertex*)memalign(16,6 * sizeof(struct Vertex));


That wasted lots of my time, since there are no samples in the SDK that do dynamic memory allocation of sceGumDrawArray buffers.
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ffelagund



Joined: 16 Mar 2006
Posts: 14
PostPosted: Tue Jul 04, 2006 8:49 pm    Post subject: Reply with quote
Thanks!

That's exactly what was happening, once changed that lines, the triangle gets renderered perfectly :)
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