directx user

thx for your reply, i now got the instancing working but theres anyway still a question that i want to ask:

As i set the vertexbuffers one for the model and the other one for the instance position etc., how does directx knows wich buffer is ment to be the geometrie buffer and which the instance buffer?

I also experienced a graphic bug with using this code:

struct instancedata
{
XMFLOAT3 Position;
};
struct texturedvertex
{
	XMFLOAT3 Pos;
XMFLOAT2 uvkoord;
};
struct geometry
{
ID3D11Buffer*		   vertexbuffer;
int vertsanzahl;
ID3D11Buffer*		   indicesbuffer;
int indicesanzahl;
};
geometry geometrybuffer;
ID3D11Buffer* instancebuffer = NULL;
ID3D11InputLayout*	  vertexlayouttextured = NULL;


:::::
init buffers
:::::









inp layout:

	D3D11_INPUT_ELEMENT_DESC layout[] =
	{
		{ "POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, 0, D3D11_INPUT_PER_VERTEX_DATA, 0 },
  { "TEXCOORD", 0, DXGI_FORMAT_R32G32_FLOAT, 0, 12, D3D11_INPUT_PER_VERTEX_DATA, 0 },
  { "POSITION", 1, DXGI_FORMAT_R32G32B32_FLOAT, 1, 20, D3D11_INPUT_PER_INSTANCE_DATA, 1 },
	};
hr = device->CreateInputLayout( layout, numElements, pVSBlob->GetBufferPointer(),
										  pVSBlob->GetBufferSize(), &vertexlayouttextured );
if( FAILED( hr ) )
  return hr;





rendering:






UINT trianglebuff = sizeof(texturedvertex);
UINT instancebuff = sizeof(instancedata);
UINT zerooffset = 0;

immediatecontext->IASetInputLayout( vertexlayouttextured );
immediatecontext->IASetPrimitiveTopology(D3D11_PRIMITIVE_TOPOLOGY::D3D10_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP); //Triangle strip
immediatecontext->IASetVertexBuffers( 0, 1, &geometrybuffer.vertexbuffer ,&trianglebuff , &zerooffset ); //set the geometrybuffer
immediatecontext->IASetVertexBuffers( 1, 1, &instancebuffer ,&instancebuff , &zerooffset ); //set the instance buffer

immediatecontext->VSSetShader( vertexshader, NULL, 0 ); //set vertexshader
immediatecontext->VSSetConstantBuffers( 0, 1, &matrixbuffer ); //containing world view projection matrices  
immediatecontext->PSSetShader( pixelshader, NULL, 0 ); //set pixelshader
immediatecontext->PSSetShaderResources(0,1,&textur);
//set textur

immediatecontext->Map( instancebuffer, 0, D3D11_MAP_WRITE_DISCARD, 0, &MappedResource);
instancedata *data = ( instancedata* )MappedResource.pData;
//map the instance-data
for (int i = 0; i < sys.bodiesl();i++)
{
  data[i].Position = XMFLOAT3((float)(sys.hks[i].Position.x / scaler),(float)(sys.hks[i].Position.y / scaler),(float)(sys.hks[i].Position.z / scaler));
}
immediatecontext->Unmap( instancebuffer, 0 );
//update positions

immediatecontext->DrawIndexedInstanced(geometrybuffer.indicesanzahl,sys.bodies(),0,0,0);
//draw as many instances as  bodies









hlsl shader:



static const float PI = 3.14159265f;




cbuffer matrix : register( b0 ) //matrices
{
	row_major matrix World;
	row_major matrix View;
	row_major matrix Projection;
	
};

Texture2D<float4> Textur : register(t0);
SamplerState Meshtexturesampler
{
	Filter = MIN_MAG_MIP_LINEAR;
	AddressU = Wrap;
	AddressV = Wrap;
};
//textures, sampler


struct VS_INPUT
{
	float4 Pos : POSITION0;
	float2 Textcoord  : TEXCOORD0;
	float4 instancepos : POSITION1;
};
struct PS_INPUT
{
	float4 Pos : SV_POSITION;
	float2 Textcoord  : TEXCOORD0;
	
};
//input structures



PS_INPUT VS( VS_INPUT input )
{
	PS_INPUT output = (PS_INPUT)0;

	input.Pos.x += input.instancepos.x;
	input.Pos.y += input.instancepos.y;
	input.Pos.z += input.instancepos.z;

	output.Pos = mul(input.Pos,World);
	output.Pos = mul(output.Pos,View);
	output.Pos = mul(output.Pos,Projection);
	output.Textcoord = input.Textcoord;

	return output;
}


float4 PS( PS_INPUT input) : SV_Target
{
	return Textur.Sample(Meshtexturesampler,input.Textcoord);
}

Now the problem is that the second instance always stays at the center of the scene but it should move i guess there are some errors in the input layout declaration?

thx for your reply, but i detected the problem. The Problem was the matrix assigment, i changed the assignment to the map-unmap solution and it worked. thx anyway for telling me the fact that the shader can handle the storaging of the matrice as column major or row major i will recognize it when i will have my next transformation Issues .