RenderMan & RISpec, Problem writing a shader function

1. write depth buffer from depth map in pixel shader

Hi evry one,

I m trying to write from a rectangular depth texture to the depth
buffer in a pixel shader. To so saw I draw in Opengl a quad of the
size of the screen with the corresponding texture coordinates. Then in
a shader I perform a texture lookup in my depth map at the position of
the pixel to get its depth and then I return that depth which would
write into the depth buffer (I verified my opengl states and the depth
mask is true). When I try to do so it seems not to work. My problem is
I don't understand what I am supposed to put in my OUT.depth because
the texRECT returns a float4 when I perform a texture lookup (what is
the format of result of texRECT with a depth map??? is it (D,D,D,1)
???). I use a 24bit depth map which is correct because I use it
elsewhere in my program.

When I try to display the depth map in the frame buffer to debug I
only get few pixels at 0 and the rest at 1. What do I do wrong

Here is my code :

Code:

struct fragment_out
{
   float4 color   : COLOR;
   float depth : DEPTH;
};

struct fragment_in
{
   float4 color   : COLOR;
   float4 position : WPOS;
};

fragment_out main(fragment_in IN,
                  uniform samplerRECT samplerZ,
                  uniform samplerRECT samplerColor)
{
   fragment_out OUT;   
   
   float4 res      = texRECT(samplerZ,IN.position.xy);
   float4 rescolor = texRECT(samplerColor,IN.position.xy); //just to
have the color of the pixel (no use for writting in the depth buffer)
 
  OUT.depth = res.r; // What should I put ( res = (D,D,D,1) ???)
   
   //OUT.color=rescolor; // for a correct color
   
   OUT.color[0]=res.r // to debug ....
   OUT.color[1]=0.0;
   OUT.color[2]=0.0;
   OUT.color[3]=1.0;
   return OUT;
}

2. question about the arguments in shader function

3. shader input semantics and function D3DXGetShaderInputSemantics

1) I can get shader input semantics from function
D3DXGetShaderInputSemantics. It will be useful to get type too, because I
don't know what format for example normal has, float3 or ubyte4? If the type
is known I can prepare data for this type dynamically. My question is: can I
get types and semantics together from shaders?

2) How can I get size of resources? (textures)

Thank you!

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5. how to organize multiple functions in a GLSL shader program

Hi all,

I am writing a fragment shader program. There are several sub-
functions and a main function. One of the sub-functions uses the
'uniform' variables. My problem is how to organize these functions
properly in grammar, and whether the use of uniform variables is
correct in my following program. If not, how to use the uniform
varibales in this case? My program structure is like follows:

/////////////////////////////////////////////////
uniform sampler2D tex;
uniform vec2 size;

void func1()
{
...
}

void func2()
{
...
// uniform variables are used here
a[0] = size[0];
a[1] = size[1];
 vec2 hi = texture2D( tex, pos).ra
....
}

void main()
{
...
func1();
func2();
...
}
/////////////////////////////////////////////////

Thanks,

J.

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7. Problems with 'fast write on' on KT3 Ultra 2 with PowerColor 9800 pro

Hi

When 'fast write' is enabled in bios graphics get a bit corrupt in win
(xp) and in games. the mousepointer is for instance covered with black
stripes and icons on the desktop are weird. latest catalyst 3.8
installed, directx 9.0b, via 4.49. nothing is overclocked. my mobo
supports 4x agp. is that the problem?

any suggestions anyone?

thnx

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