Hi !

// Create our vertex input layout
	D3D11_INPUT_ELEMENT_DESC layout[4];
	layout[0].SemanticName = "POSITION";
	layout[0].SemanticIndex = 0;
	layout[0].Format = DXGI_FORMAT_R32G32B32A32_FLOAT;
	layout[0].InputSlot = 0;
	layout[0].AlignedByteOffset = 0;
	layout[0].InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
	layout[0].InstanceDataStepRate = 0;

	layout[1].SemanticName = "TEXCOORD";
	layout[1].SemanticIndex = 0;
	layout[1].Format = DXGI_FORMAT_R32G32_FLOAT;
	layout[1].InputSlot = 0;
	layout[1].AlignedByteOffset = D3D11_APPEND_ALIGNED_ELEMENT;
	layout[1].InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
	layout[1].InstanceDataStepRate = 0;

	layout[2].SemanticName = "NORMAL";
	layout[2].SemanticIndex = 0;
	layout[2].Format = DXGI_FORMAT_R32G32B32_FLOAT;
	layout[2].InputSlot = 0;
	layout[2].AlignedByteOffset = D3D11_APPEND_ALIGNED_ELEMENT;
	layout[2].InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
	layout[2].InstanceDataStepRate = 0;

	layout[3].SemanticName = "COLOR";
	layout[3].SemanticIndex = 0;
	layout[3].Format = DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;
	layout[3].InputSlot = 0;
	layout[3].AlignedByteOffset = D3D11_APPEND_ALIGNED_ELEMENT;
	layout[3].InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
	layout[3].InstanceDataStepRate = 0;

	UINT numElement = ARRAYSIZE( layout ) ;
	if(D3DERR_INVALIDCALL == deviceDX11->CreateInputLayout( layout, numElement, blobVertexGBuffer->GetBufferPointer(), blobVertexGBuffer->GetBufferSize(), &vertexGBufferLayout ))
		return ;

The variable "vertexGBufferLayout" has no adress (null pointer), after createInputLayout method. This vraiable is of type ID3D11InputLayout and is in "out" as described in the directx documentation.

The associated vertex shader is :

struct vsIn
{
	float4 position : POSITION ;
	float2 texCoord : TEXCOORD0 ;
	float3 normal   : NORMAL   ;
	float4 color    : COLOR ;
};

struct vsOut
{
	float4 RTposition : POSITION1 ;
	float2 texCoord : TEXCOORD0 ;
	float4 color : COLOR0 ;
	float4 finalPos :SV_POSITION ;
	float3 normal   : NORMAL   ;
	float4 posInLightSpace	 : TEXCOORD1 ;
};

cbuffer globalMatrices
{
	float4x4 WorldView ;
	float4x4 WorldViewProj;
	float4x4 InverseTransposedWorld ;
	//float4x4 lightViewProj ;
}

vsOut vertex_main(in vsIn IN, vsOut OUT)//, in float4 position : POSITION0)
{
	
	//OUT.posInLightSpace = mul(position, lightViewProj); 
	OUT.RTposition = mul(IN.position, WorldView);
	OUT.color = IN.color ;
	OUT.color.w = 1.0 ; 
	//OUT.normal = mul(IN.normal, WorldView);
	OUT.normal = mul(IN.normal, InverseTransposedWorld);
	OUT.texCoord = IN.texCoord ;
	
    OUT.finalPos= mul( IN.position, WorldViewProj );

	return OUT ;
} 

Can you help me ? Did I do something wrong ?

I'm not sure that the pixel format is right as I did, specially for COLOR semantic (is it the right name for colors' semantic ?) where I put DXGI_FORMAT_R8G8B8A8_UNORM_SRGB

ARRAYSIZE makes a sizeof of the whole array (here the variable named "layout") divided by the sizeof the first element of this array. Here it gives me a size of 4.

blobVertexGBuffer has a valid adress, yes.

I would like to put something else than DXGI_FORMAT_R8G8B8A8_UNORM_SRGB, but I don't know what to put : R8G8B8A8 it's sure, but in float ? UINT ? It is to store colors, and don't know what is appropriate or the most appropriate to store colors from a scene representation.

Ok but why ? It stores colors on 128 bits, instead of 32 bits, so why ?

It tried but it don't work.

vertexGBufferLayout has no value (null pointer), I tried with DXGI_FORMAT_R8G8B8A8_UNORM and vertexGBufferLayout has still no value, I tried also by removing all lines concerning colors in the vertex shader and this code from C++ code :

layout[3].SemanticName = "COLOR";
layout[3].SemanticIndex = 0;
layout[3].Format = DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;
layout[3].InputSlot = 0;
layout[3].AlignedByteOffset = D3D11_APPEND_ALIGNED_ELEMENT;
layout[3].InputSlotClass = D3D11_INPUT_PER_VERTEX_DATA;
layout[3].InstanceDataStepRate = 0;

And it still doesn't work

I tried to put D3D11_CREATE_DEVICE_DEBUG and my program crashes sooner in my code at a place where it usually doesn't crash. And I have no more messages in the output than before.