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need help with some guTranslate problem

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Heimdall

Joined: 10 Nov 2005
Posts: 259
Location: Netherlands

Posted: Sun Nov 30, 2008 5:14 am Post subject: need help with some guTranslate problem

I've a simple piece of code:

Code:

fbp0 = 0;

// Init GU
sceGuInit();
sceGuStart(GU_DIRECT, display_list);

// Set Buffers
sceGuDrawBuffer(GU_PSM_8888, fbp0, BUF_WIDTH);
sceGuDispBuffer(SCR_WIDTH, SCR_HEIGHT, (void*)0x88000, BUF_WIDTH);
sceGuDepthBuffer((void*)0x110000, BUF_WIDTH);

sceGuOffset(2048 - (SCR_WIDTH/2), 2048 - (SCR_HEIGHT/2));
sceGuViewport(2048, 2048, SCR_WIDTH, SCR_HEIGHT);
sceGuDepthRange(65535, 0);

// Set Render States
// Enable scissor test, depth test, smooth shading and culling
sceGuScissor(0, 0, SCR_WIDTH, SCR_HEIGHT);
sceGuEnable(GU_SCISSOR_TEST);
sceGuDepthFunc(GU_GEQUAL);
sceGuEnable(GU_DEPTH_TEST);
sceGuShadeModel(GU_SMOOTH);
sceGuFrontFace(GU_CCW);
sceGuEnable(GU_CULL_FACE);
sceGuEnable(GU_CLIP_PLANES);

// set clear color/depth
sceGuClearColor( GU_COLOR( 0.0f, 0.0f, 0.0f, 1.0f ) );
sceGuClearDepth(0);

// setup texture
sceGuEnable(GU_TEXTURE_2D);       //Enable Texture2D
sceGuTexFunc(GU_TFX_MODULATE, GU_TCC_RGB);
sceGuTexFilter(GU_LINEAR, GU_LINEAR);    // Linear filtering
sceGuTexScale(1.0f, 1.0f); // No scaling
sceGuTexOffset(0.0f, 0.0f);

sceGuFinish();
sceGuSync(0,0);

sceDisplayWaitVblankStart();
sceGuDisplay(GU_TRUE);
// finish

// setup projection matrix
sceGumMatrixMode(GU_PROJECTION);
sceGumLoadIdentity();
sceGumPerspective(fov, aspect, znear, zfar);

// look at
sceGumMatrixMode(GU_VIEW);
sceGumLoadIdentity();
sceGumLookAt(eye, center, up);

// io
sceCtrlSetSamplingMode(PSP_CTRL_MODE_ANALOG);

Model* model = loadModel();

while(1) {
   // begin
   sceGuStart(GU_DIRECT, display_list);
   sceGuClear(GU_COLOR_BUFFER_BIT|GU_DEPTH_BUFFER_BIT);

   // peek
   sceCtrlPeekBufferPositive(&pad, 1);

   // update x and y
   model->position->x = (float) (pad.Lx - 128);
   model->position->y = (float) (pad.Ly - 128);

   // texture bind
   sceGuColor(GU_COLOR(1.0f,1.0f,1.0f,0.0f));
   sceGuTexMode(model->texture->mode, 0, 0, 1);
   sceGuTexImage(0,
         model->texture->width,
         model->texture->height,
         model->texture->width,
         model->texture->pixels);

   sceGumMatrixMode(GU_MODEL);
// i should see the model to go left and right, top down, right? why doesn't it work?
   sceGumTranslate(model->position));
   sceGumLoadMatrix(model->initialTransform));

   // draw mesh
   sceGumDrawArray(
      GU_TRIANGLES,
      model->mesh->vtype | GU_TRANSFORM_3D,
      model->mesh->nFaces * 3,
      model->mesh->indices,
      model->mesh->vertices);

   // end
   sceGuFinish();
   sceGuSync(0, 0);

   // swap buffers
   fbp0 = sceGuSwapBuffers();
}

And I was trying to use the analog stick to translate my mesh on the x, y axys but i cannot see anything happening.

The model is rendered and the texture also but the translation doesn't seem to work, I'm doing something wrong for sure, can anyone show me what?

Thanks!

jsharrad

Joined: 20 Oct 2005
Posts: 102

Posted: Sun Nov 30, 2008 6:13 am Post subject:

Looks like you're overwriting the current translated matrix with model->initialTransform before you draw the model.

Insert_witty_name

Joined: 10 May 2006
Posts: 376

Posted: Sun Nov 30, 2008 10:00 am Post subject:

Something like this may help:

Code:

sceGumMatrixMode(GU_MODEL);
sceGumLoadMatrix(model->initialTransform);
sceGumPushMatrix();
sceGumTranslate(model->position);

// draw mesh
sceGumDrawArray(
GU_TRIANGLES,
� ��model->mesh->vtype | GU_TRANSFORM_3D,
� ��model->mesh->nFaces * 3,
� ��model->mesh->indices,
� ��model->mesh->vertices);

sceGumPopMatrix();

Heimdall

Joined: 10 Nov 2005
Posts: 259
Location: Netherlands

Posted: Mon Dec 01, 2008 4:12 am Post subject:

yeap that was it, thanks!

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