[SOLVED] gl texture in vertex shader

[sergey.pozhidaev]

hi, i made displacement shader, but it works only on d3d11.

-C++:

Unigine::MaterialPtr mat = Unigine::Materials::get()->findMaterial("mat1");
if(mat.get()) {
	tid = mat->findTexture("tex1");
	if(tid != -1) mat->setImageTextureName(tid, "tex.png");
}

-material:

<texture name="tex1" unit="8" shader="vertex" wrap="clamp" filter="bilinear">core/textures/mesh_base_height.dds</texture>

-shader:

#ifdef OPENGL
uniform sampler2D s_texture_8;
#elif DIRECT3D11
Texture2D s_texture_8 : register(t8);
#endif

#ifdef OPENGL
##extension GL_ARB_gpu_shader_fp64 : enable
#endif

#ifdef OPENGL
float4 elev = textureLod(s_texture_8,texcoord.xy, 0) * 65536.0f;
#elif DIRECT3D11
float4 elev = s_texture_8.SampleLevel(s_sampler_8,texcoord.xy, 0) * 65536.0f;
#endif
position += normal * elev.x;

relief wawas only in d3d, opengl - zero elev.x? why?

[helmut.bressler]

Hello sergey,

 

I think the problem is that the mapping between the texture unit numbering in the material is different from the numbering in a non-fragment shader in opengl (I would guess in order to avoid naming conflicts. All s_textures live in the same namespace in a opengl shader program).

 

I have a vertex shader which is using a texture. I bind the texture to unit 0 in the material and I have to access it as s_texture_16 in the vertex shader:

<!-- material file:
<texture name="starPos" unit="0" shader="vertex"> project/textures/white.dds</texture> -->


// vertex shader:
uniform sampler2D s_texture_16;

So I guess in your case it should be s_texture_24 (unless 24 is already reserved for the geometry, controll or evaluation shader).
 

Cheers

 Helmut

[sergey.pozhidaev]

BIG thanks!