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2D image failing to display

 
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snow



Joined: 15 Dec 2007
Posts: 31
PostPosted: Sun Jan 27, 2008 12:58 am    Post subject: 2D image failing to display Reply with quote
I've been toying around with the snes emulator and this is simply me attempting to display a rendered frame. I've borrowed the rendering code from snes9xtyl. The native resolution of the snes is 256x224 (normally). I tried just writing to the VRAM directly which ended up at least showing me pixels but they were the wrong color and pretty much a mess :-P

I'm using the following initialization,
Code:

#define VRAM_ADDR 0x04000000
#define MAX_DRAW_BUFFER_SIZE (0x077800)
#define BUF_WIDTH (512)
#define SCR_WIDTH (480)
#define SCR_HEIGHT (272)

void* drawBufferAddress = 0;

{
   sceGuInit();
   sceGuStart(GU_DIRECT,list);
   sceGuDrawBuffer(GU_PSM_5551,(void*)0,BUF_WIDTH);
   sceGuDispBuffer(SCR_WIDTH,SCR_HEIGHT,(void*)MAX_DRAW_BUFFER_SIZE,BUF_WIDTH);
   sceGuOffset(2048 - (SCR_WIDTH/2),2048 - (SCR_HEIGHT/2));
   sceGuViewport(2048,2048,SCR_WIDTH,SCR_HEIGHT);
   sceGuScissor(0,0,SCR_WIDTH,SCR_HEIGHT);
   sceGuEnable(GU_SCISSOR_TEST);
   sceGuClear(GU_COLOR_BUFFER_BIT);
   sceGuFinish();
   sceGuSync(0,0);

   sceDisplayWaitVblankStart();
   sceGuDisplay(1);
}


And my rendering loop,
Code:

{
sceKernelDcacheWritebackAll();

   sceGuStart(GU_DIRECT,list);
   sceGuDrawBufferList(GU_PSM_5551,(void*)drawBufferAddress,512);
   sceGuTexFunc(GU_TFX_REPLACE,GU_TCC_RGB);
   sceGuEnable(GU_SCISSOR_TEST);
    
   sceGuScissor(0,0,SCR_WIDTH,SCR_HEIGHT);
   sceGuDisable(GU_DEPTH_TEST);
   sceGuDisable(GU_ALPHA_TEST);

   sceGuTexMode(GU_PSM_5551,0,0,0);
   sceGuTexImage(0,Width,Height,512,(void*)GFX.Screen);
   sceGuTexFunc(GU_TFX_REPLACE,0);
   sceGuTexFilter(GU_NEAREST,GU_NEAREST);
   sceGuTexScale(1.0f/Width,1.0f/Height);
   sceGuTexOffset(0,0);
   sceGuTexWrap(GU_CLAMP,GU_CLAMP);
   
   struct Vertex* vertices = (struct Vertex*)sceGuGetMemory(4 * sizeof(struct Vertex));       
   vertices[0].u = -128;
   vertices[0].v = -112;
   vertices[0].x = 0;
   vertices[0].y = 0;
   vertices[1].u = 128;
   vertices[1].v = -112;
   vertices[1].x = 480;
   vertices[1].y = 0;
   vertices[2].u = -128;
   vertices[2].v = 112;
   vertices[2].x = 0;
   vertices[2].y = 272;
   vertices[3].u = 128;
   vertices[3].v = 112;
   vertices[3].x = 480;
   vertices[3].y = 272;

   sceGuDrawArray(GU_SPRITES,GU_TEXTURE_16BIT|GU_VERTEX_16BIT|GU_TRANSFORM_2D,4,0,vertices);
   
   sceGuFinish();
   sceGuSync(0,0);
   drawBufferAddress = sceGuSwapBuffers();
}


Any help is appreciated.
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quadrizo



Joined: 23 Aug 2007
Posts: 21
PostPosted: Sun Jan 27, 2008 9:03 am    Post subject: Reply with quote
well ...
when you use GU_SPRITES you have to define only two vertices : the top left and the bottom right corner

so here you draw two sprites with no height
try:
Code:

   struct Vertex* vertices = (struct Vertex*)sceGuGetMemory(2 * sizeof(struct Vertex));       
   vertices[0].u = -128;
   vertices[0].v = -112;
   vertices[0].x = 0;
   vertices[0].y = 0;

   vertices[1].u = 128;
   vertices[1].v = 112;
   vertices[1].x = 480;
   vertices[1].y = 272;

   sceGuDrawArray(GU_SPRITES,GU_TEXTURE_16BIT|GU_VERTEX_16BIT|GU_TRANSFORM_2D,2,0,vertices);
[/code]
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