Hi guys,

right now I'm having a small quad with a texture on it, and I wan't it to face my camera. The reason for that is because I wan't to mess around with Post Processing, It looks for me right now:

if ssao

Render Normals to TEXTUREN

Render Position to TEXTUREP

Render Diffuse to TEXTURED

Render Plane with TEXTUREN | TEXTUREP | TEXTURED - To do some post processing

Show it!

Now please correct me if this is a wrong way!

But how is it possible to rotate and translate a quad to face the player/camera, looking like it's a real 3d scene (with some post processing) ?

Thank You

Though now I'm not sure if it's the right way...

But how is it possible to rotate and translate a quad to face the player/camera, looking like it's a real 3d scene (with some post processing) ?

(-1,1,0,1) for upper left

(1,1,0,1) for upper right

(-1,-1,0,1) for lower left

(1,-1,0,1) for lower right

Since these are in clip space, you are guaranteed to cover the entire viewport regardless of the actual size of it.

But how in terms of HLSL would this be possible?

So would i specify those 4 points and directly map them into HLSL, without any use of any Matrices? Sorry, I'm not very familiar with this topic of view space conversions...

But how in terms of HLSL would this be possible?

So would i specify those 4 points and directly map them into HLSL, without any use of any Matrices? Sorry, I'm not very familiar with this topic of view space conversions...

Yup - that's exactly right. The vertices are already ready to go to the rasterizer, so you just pass them through the vertex shader. Just make sure your w-values are equal to 1, and it should work fairly easily. To test it out, you can also try modifying the values to cover half the screen, a quarter of the screen, etc...

Sorry to take your time, I do understand the concept, but I'm doing it wrong somehow.

Post Process Shader file for now: (Where shader stuff and quad is created)

#include "stdafx.h"
#include "PostProcess.h"

#include <d3dcompiler.h>
#include <DxErr.h>

#define CE_WARNING(title, message) MessageBoxA(NULL, message, title, 0) 

BOOL PostProcessClass::Create( ID3D11Device *&dev, ID3D11DeviceContext *&devcon )
{
	string finals = string(
		"C:\\Users\\Utilizador\\Documents\\Visual Studio 2012\\Projects\\Cube3D\\Product\\Bin32\\") + string("PostProcessShader.hlsl").c_str();

	ID3D10Blob *vserrors;
	ID3D10Blob *pserrors;
	HRESULT HR;

	D3DX11CompileFromFile(finals.c_str(), 0, 0, "VShader", "vs_5_0", D3DCOMPILE_DEBUG, 0, 0, &VS, &vserrors, &HR);
	D3DX11CompileFromFile(finals.c_str(), 0, 0, "PShader", "ps_5_0", D3DCOMPILE_DEBUG, 0, 0, &PS, &pserrors, &HR);
	
	// create the shader objects
	if (!VS)
	{
		DXTRACE_ERR(TEXT(DXGetErrorDescription(HR)),HR);

		MessageBoxA(NULL, "The Post Process vertex shader creation has failed, program will now exit!", "ERROR", 0);
		exit(0);
	}
	if (!PS)
	{
		DXTRACE_ERR(TEXT(DXGetErrorDescription(HR)),HR);

		MessageBoxA(NULL, "The Post Process pixel shader creation has failed, program will now exit!", "ERROR", 0);
		exit(0);
	}
	
	dev->CreateVertexShader(VS->GetBufferPointer(), VS->GetBufferSize(), NULL, &pVS);
	dev->CreatePixelShader(PS->GetBufferPointer(), PS->GetBufferSize(), NULL, &pPS);

	D3D11_INPUT_ELEMENT_DESC ied[] =
	{
		{"POSITION", 0, DXGI_FORMAT_R32G32B32_FLOAT, 0, D3D11_APPEND_ALIGNED_ELEMENT, D3D11_INPUT_PER_VERTEX_DATA, 0}
	};
	
	if (dev->CreateInputLayout(ied, 1, VS->GetBufferPointer(), VS->GetBufferSize(), &pLayout) != S_OK)
		CE_WARNING("Input Layout Creation", "Input Layout creation in Post Process has failed!");

	// create the vertex buffer
	D3D11_BUFFER_DESC bd;
	ZeroMemory(&bd, sizeof(bd));

	Vertices[0] = D3DXVECTOR3(-1, 0, 1);
	Vertices[1] = D3DXVECTOR3(1, 0, 1);
	Vertices[2] = D3DXVECTOR3(-1, 0, -1);
	Vertices[3] = D3DXVECTOR3(1, 0, 1);

	Indices[0] = 3;
	Indices[1] = 1;
	Indices[2] = 2;
	Indices[3] = 2;
	Indices[4] = 1;
	Indices[5] = 0;

	bd.Usage = D3D11_USAGE_DYNAMIC;
	bd.ByteWidth = sizeof(D3DXVECTOR3) * 4;
	bd.BindFlags = D3D11_BIND_VERTEX_BUFFER;
	bd.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
	
	dev->CreateBuffer(&bd, NULL, &vBFF);

	D3D11_MAPPED_SUBRESOURCE ms;
	// copy the vertices into the buffer
	devcon->Map(vBFF, NULL, D3D11_MAP_WRITE_DISCARD, NULL, &ms);    // map the buffer
	memcpy(ms.pData, Vertices, sizeof(Vertices));                 // copy the data
	devcon->Unmap(vBFF, NULL);

	//**INDICES**//

	bd.Usage = D3D11_USAGE_DYNAMIC;
	bd.ByteWidth = sizeof(DWORD) * 6;
	bd.BindFlags = D3D11_BIND_INDEX_BUFFER;
	bd.CPUAccessFlags = D3D11_CPU_ACCESS_WRITE;
	
	dev->CreateBuffer(&bd, NULL, &iBFF);

	D3D11_MAPPED_SUBRESOURCE msI;
	// copy the vertices into the buffer
	devcon->Map(iBFF, NULL, D3D11_MAP_WRITE_DISCARD, NULL, &msI);    // map the buffer
	memcpy(msI.pData, Indices, sizeof(Indices));                 // copy the data
	devcon->Unmap(iBFF, NULL);
}

void PostProcessClass::ApplyShader(ID3D11Device *&dev, ID3D11DeviceContext *&devcon)
{
	// set the shader objects
	devcon->VSSetShader(pVS, 0, 0);
	devcon->PSSetShader(pPS, 0, 0);
	devcon->IASetInputLayout(pLayout);
}

void PostProcessClass::Render(ID3D11DeviceContext *&devcon, ID3D11Device *&dev)
{
	ApplyShader(dev, devcon);

	UINT stride = sizeof(D3DXVECTOR3);
	UINT offset = 0;

	devcon->IASetVertexBuffers(0, 1, &vBFF, &stride, &offset);
	devcon->IASetIndexBuffer(iBFF, DXGI_FORMAT_R32_UINT, 0);

	devcon->DrawIndexed(6, 0, 0);
}

Now the output is a black screen, and heres the reason from debugging:

When you look at the vertex shader, the result is a straight line, which isn't exactly what I wanted

Now the question is why?

Ohh, almost forgot, my shader (it's simple for now for debugging):

struct VOut
{
    float4 position : SV_POSITION;
};

VOut VShader(float3 position : POSITION)
{
    VOut output;

    output.position = float4(position, 1.0f);
	output.position.w = 1.0f;
	
    return output;
}

float4 PShader(VOut input) : SV_TARGET
{
	return float4(1, 0, 0, 1);
}

Between, should I even send an index buffer? For something as simple as this, is Direct3D capable of generating it itself?

Wait, so what should I do, I'm probably not understanding this then... What's wrong with my code?

Ok, got it working using Adam_42's method, but thanks!