Vertex Shader tex2Dlod() Problem

[Christi258]

Hi all,
I have a problem with my Vertex Shader. I want to read out a texture in the vertex shader. The only available funktion is tex2Dlod (http://msdn.microsoft.com/en-us/library ... 85%29.aspx).

I use it this way:

Code: Select all

 
float4x4 ViewProj;
float4x4 World;
sampler2D HMap;
 
struct VS_INPUT
{
float4 pos : POSITION;
float3 Normal : NORMAL0;
float2 tex : TEXCOORD0;
};
 
VS_OUTPUT vMain( VS_INPUT inp )
{
    VS_OUTPUT outp;
    outp.tex = inp.tex;
    outp.pos = mul( inp.pos, World);
    
    outp.pos.y += tex2Dlod( HMap, float4(inp.tex.xy, 0.0, 0.0) ).g * 20;
    
    outp.pos = mul( outp.pos, ViewProj);
    return outp;
}
 

But it always returns 0.
What goes wrong?

[Granyte]

Wich version of irrlicht are you using ? And to wich texture layer are you sending your texture to?

Vertex texture are a 1.8 feature for dx

[Christi258]

I use irrlicht 1.8.1

loading the texture:

Code: Select all

 
    IMeshSceneNode *node = smgr->addMeshSceneNode(mesh);
    ITexture *tex = driver->getTexture("noise.bmp");
    node->setMaterialTexture(0, tex);
 

IShaderConstantSetCallBack:

Code: Select all

 
    s32 TextureLayerID = 0;
    services->setVertexShaderConstant("HMap", &TextureLayerID, 1);
 

[Granyte]

If you are using dx the setVertexShaderConstant is not necessary and could even be what is causing the issue

and to what vertex shader version do you compile?

[Christi258]

I compile in 3.0. (The first version that supports tex2Dlod()).
But even if I comment out the setVertexShaderConstant the tex2Dlod returns 0.

[Granyte]

That is odd what texture format and what gpu are you using some older gpu did not support all texture format in vertex shader

After that ill need to write a test app

[Christi258]

Color Format is ECF_A8R8G8B8 it has a size of 512x512 pixels.
Graphic card: NVIDIA GeForce GTX 560 Ti

[hendu]

Do you absolutely require DX? It works fine in GL

[Christi258]

That's one possibility, but I rather would know, where the problem lays.

[Granyte]

Alright i suggest you post the entire code to the test app and the texture.

vertex texture works fine in dx9 but i have been the only one using them

[Christi258]

Download for the source code:
http://www.file-upload.net/download-882 ... t.rar.html

Thx

[Granyte]

I suspected this but I really needed to get home and compile to test

You need to compile the pixel shader to PS 3.0 when using VS 3.0
so change

s32 material = gpuPS->addHighLevelShaderMaterialFromFiles( "shader.hlsl", "vMain", EVST_VS_3_0,
"shader.hlsl", "pMain", EPST_PS_2_0, callback);

to

s32 material = gpuPS->addHighLevelShaderMaterialFromFiles( "shader.hlsl", "vMain", EVST_VS_3_0,
"shader.hlsl", "pMain", EPST_PS_3_0, callback);

and it works fine

[Christi258]

Sorry, but no.
Is the problem my graphic card?

[Granyte]

do you see nothing when moving toward the light?

not even the light at all?

because currently you appear under the mesh and you need to move toward the light until it appear

you gpu should be more then capable of handeling this a 560 ti is a dx11 capable gpu so unless NVidia torched their dx9 support and ran there should be no issue at all

the last thing I can think of is that I compiled against the trunk because I was to lasy to dig my 1.8.0 coppy so ill cheq if it works when compiled against 1.8 and 1.8.1


this is the version I got to work it require vc redistributable 2012 as I only have vs2013 on my machine
https://www.dropbox.com/s/1a9cggcot5djq4w/WaveTest2.rar

[Christi258]

Well, if I try yours, everything is fine