One Texture for Multiple Shaders

[sergey.pozhidaev]

hi, how specify in Materials one texture for Multiple Shaders (vertex & evaluate) from single unit?

[ulf.schroeter]

I think by binding a textures to a certain unit (e.g. 8 in the following example, make sure to use a unit NOT allocated by the base material). This works at least for vertex/fragment shader, though I don't know if it also works for evaluate shader.

	<material name="mesh_overlay_base" parent="mesh_base" editable="0">
		
		<!-- deferred shaders -->
		<shader pass="deferred" object="mesh"
			defines="BASE_DEFERRED"
			alpha_test_defines=",ALPHA_TEST"
			alpha_fade_defines=",ALPHA_FADE"
			deferred="1"
			detail_defines=",OVERLAY_0,OVERLAY_1,MULTIPLY_0,MULTIPLY_1"
			parallax_defines=",PARALLAX"
			emission_defines=",EMISSION"
			volumetric_defines=",VOLUMETRIC"
			vertex="core/shaders/default/mesh/vertex_base.shader"
			fragment="rde/shaders/mesh/fragment_overlay_base_deferred.shader"/>
         
		<!-- ambient shaders -->
		<shader pass="ambient" object="mesh"
			defines="BASE_AMBIENT,AMBIENT"
			alpha_test_defines=",ALPHA_TEST"
			alpha_fade_defines=",ALPHA_FADE"
			ambient_defines="0,OPACITY,TRANSPARENT,LIGHTMAP"
			detail_defines=",OVERLAY_0,OVERLAY_1,MULTIPLY_0,MULTIPLY_1"
			parallax_defines=",PARALLAX"
			emission_defines=",EMISSION"
			vertex="core/shaders/default/mesh/vertex_base.shader"
			fragment="rde/shaders/mesh/fragment_overlay_base_ambient.shader"/>
		
        <!-- bindings -->
		<bind object="mesh_dynamic" to="mesh"/>
	
		<!-- textures -->
		<texture name="overlay" anisotropy="1" unit="8">rde/textures/world-country-colors.dds</texture>
        
        <!-- parameters -->
		<parameter name="overlay_scale" type="slider" shared="1" min="0.0" max="1.0" flags="max_expand">0.0</parameter>
        
	</material>

[sergey.pozhidaev]

"tess_elevations" is need to be in vetex & evaluation:

<material name="mesh_Tess" parent="mesh_tessellation_base">
	<!-- textures -->
	<texture name="tess_diffuse" unit="7" shader="fragment" filter="bilinear">core/textures/mesh_base_height.dds</texture>
	<texture name="tess_elevations" unit="8" filter="bilinear">core/textures/mesh_base_height.dds</texture>
		
</material>

in this case tess_elevations (s_texture_8) empty in both shaders

[forhaxed]

Hi Sergey!

 

Please show the shader sources, I'm wondering if you're using correct samplers.

[sergey.pozhidaev]

evaluate shader:

/******************************************************************************\
*
* Direct3D11
*
\******************************************************************************/

#elif DIRECT3D11

#ifdef USE_TESSELLATION && TESSELLATION

#include <core/shaders/default/common/evaluate_base.h>
#include <shaders/mesh_Tess/evaluate_base.h>

Texture2D s_texture_0 : register(t0);
Texture2D s_texture_8 : register(t8);	//elev

[domain("tri")]
EVALUATE_OUT main(EVALUATE_CONSTANT_IN IN,const OutputPatch<EVALUATE_IN,3> patch) {
	...
	float4 elev = s_texture_8.SampleLevel(s_sampler_8,texcoord.xy, 0) * 65536.0f;
}

vertex shader:

/******************************************************************************\
*
* Direct3D11
*
\******************************************************************************/

#elif DIRECT3D11

Texture2D s_texture_0 : register(t0);
Texture2D s_texture_8 : register(t8);	//elev

VERTEX_OUT main(VERTEX_IN IN) {
	
	...
        float4 elev = s_texture_8.SampleLevel(s_sampler_8,texcoord.xy, 0) * 65536.0f;
}

in this case empty textures, only if s_texture_8(vertex) & s_texture_6(evaluate) units works.

[forhaxed]

Please prepare the independent test scene and attach it to your message, we couldn't reproduce the problem.

[sergey.pozhidaev]

https://developer.unigine.com/en/gtfl/388

opengl & directx variants with textures (different behaviour)

[silent]

Hi Sergey,

 

If I understand your test scene right - OpenGL variant of your shaders is working correctly, but DX11 is not?

We are in the middle of tessellation shader refactoring for Unigine 2.1-2.2 versions. Updated shader will use the new unified DX11/GL format, so the development and debugging process will become a little bit easier. We also keeping in mind your previus request for quad patches sample.

 

At this time I can only recommend to use OpenGL version of your shader if it fit your needs.

[sergey.pozhidaev]

in scene two equal textures for 2 texture slots (for vertex & evaluation shader), using one texture slot in both shaders makes zero elevations, there is comments (//zero elevs, //nonzero elevs) in code.

main quest - use one texture for both shaders