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BlackDragon777
Joined: 15 Sep 2005
Posts: 32
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 Posted: Fri Sep 23, 2005 11:35 am Post subject: My Triangle Dissapears |
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Well, I managed to draw a triangle to the screen however it only stays on the screen for half a second and then is cleared. I am swapping buffers so maybe I need to draw my triangle to some other place in emmory as well however the sample graphics demos didn't seem to be doing that. Here is my main loop.
| Code: |
while(1)
{
sceGuStart(GU_DIRECT, list);
sceGuClearColor(0);
sceGuClearDepth(0);
sceGuClear(GU_COLOR_BUFFER_BIT | GU_DEPTH_BUFFER_BIT);
sceGuColor(0xFFFFFFFF);
vertex = (Vertex *)sceGuGetMemory(sizeof(Vertex)*3);
vertex[0].x = 100;
vertex[0].y = 100;
vertex[0].z = 0;
vertex[1].x = 150;
vertex[1].y = 50;
vertex[1].z = 0;
vertex[2].x = 200;
vertex[2].y = 100;
vertex[2].z = 0;
sceGuDrawArray(GU_TRIANGLES, GU_VERTEX_32BITF | GU_TRANSFORM_2D, 3, 0, vertex);
sceGuFinish();
sceGuSync(0,0);
sceDisplayWaitVblankStart();
sceGuSwapBuffers();
}
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Any ideas? |
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BlackDragon777
Joined: 15 Sep 2005
Posts: 32
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| Posted: Fri Sep 23, 2005 11:58 am Post subject: |
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I guess if I said sceGuInit(), I wouldn't have had to post this. Sorry about this one. It was a careless overlook.
However I do have one other question.
How could I do a goraud shaded triangle based on the code I have provided? It seems that if I use sceGuColor 3 times before drawing the points, the last color I chose is tectured for the whole triangle. How can I send seperate colors for seperate verticies?
Thanks in advance! |
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Shine
Joined: 03 Dec 2004
Posts: 728
Location: Germany
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| Posted: Fri Sep 23, 2005 2:26 pm Post subject: |
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| BlackDragon777 wrote: | How could I do a goraud shaded triangle based on the code I have provided? It seems that if I use sceGuColor 3 times before drawing the points, the last color I chose is tectured for the whole triangle. How can I send seperate colors for seperate verticies?
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You could use a vertex struct like this:
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struct Vertex
{
unsigned int color;
float x, y, z;
};
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and then sceGuDrawArray(GU_TRIANGLES, GU_COLOR_8888|GU_VERTEX_32BITF|GU_TRANSFORM_3D, 3, 0, vertices) and sceGuShadeModel(GU_SMOOTH). See http://forums.ps2dev.org/viewtopic.php?p=24801#24801 for a full example and just add the ShadeModel call. |
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BlackDragon777
Joined: 15 Sep 2005
Posts: 32
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| Posted: Fri Sep 23, 2005 2:45 pm Post subject: |
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| Oh ok Cool thanks a lot Shine! |
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