c++ DirectX lighting in pixel shader issue - c++

Question

I have a problem that I cant manage to figure out. I just added a point light to my project and it makes the textures go completely black. I have no idea why.
I think that it might be either the normal that is not updating correctly or it might be calculation of s.x, s.y and s.z.
I would be very happy if someone had time to take a look at it and help me. Thanks.
So. Here is my pixel shader :
Texture2D txDiffuse : register(t0);
SamplerState sampState;
cbuffer PointLight : register(b0)
{
float3 Pos;
float diff;
float amb;
float spec;
float range;
float intensity;
};
struct VS_IN
{
float4 Pos : SV_POSITION;
float2 Tex : TEXCOORD;
float4 Norm : NORMAL;
float4 Pos2 : POSITION;
};
float4 PS_main(VS_IN input) : SV_Target
{
float3 s = txDiffuse.Sample(sampState, input.Tex).xyz;
float3 lightPos = Pos;
float3 lightVector = lightPos - input.Pos2;
lightVector = normalize(lightVector);
float nDotL = dot(lightVector, input.Norm);
float diff1 = 0.8;
float amb1 = 0.1;
s.x = (s.x * diff * nDotL + s.x * amb);
s.y = (s.y * diff * nDotL + s.y * amb);
s.z = (s.z * diff * nDotL + s.z * amb);
return float4(s, 0.0);
};
Geometry shader :
cbuffer worldMatrix : register(b0)
{
matrix world;
}
cbuffer viewMatrix : register(b1)
{
matrix view;
}
cbuffer projectionMatrix : register(b2)
{
matrix projection;
}
struct VS_IN
{
float4 Pos : SV_POSITION;
float2 Tex : TEXCOORD;
};
struct VS_OUT
{
float4 Pos : SV_POSITION;
float2 Tex : TEXCOORD;
float4 Norm : NORMAL;
float4 Pos2 : POSITION;
};
[maxvertexcount(6)]
void main(triangle VS_IN input[3] : SV_POSITION, inout TriangleStream< VS_OUT > output2)
{
matrix wvp = mul(projection, mul(world, view));
matrix worldView = mul(world, view);
float4 normal = float4(cross(input[1].Pos - input[0].Pos, input[2].Pos - input[0].Pos), 0.0f);
normal = normalize(normal);
float4 rotNorm = mul(worldView, normal);
rotNorm = normalize(rotNorm);
VS_OUT output[3];
for (uint i = 0; i < 3; i++)
{
output[i].Pos = input[i].Pos;
output[i].Pos = mul(wvp, input[i].Pos);
output[i].Tex = input[i].Tex;
output[i].Norm = rotNorm;
output[i].Pos2 = mul(worldView, output[i].Pos);
output2.Append(output[i]);
}
output2.RestartStrip();
VS_OUT outputcopy[3];
for (uint i = 0; i < 3; i++)
{
outputcopy[i].Pos = input[i].Pos + (normal);
outputcopy[i].Pos = mul(wvp, outputcopy[i].Pos);
outputcopy[i].Tex = input[i].Tex;
outputcopy[i].Norm = rotNorm;
outputcopy[i].Pos2 = mul(worldView, outputcopy[i].Pos);
output2.Append(outputcopy[i]);
}
output2.RestartStrip();
}
Code to initializing the point light:
struct PointLight
{
Vector3 Pos;
float diff;
float amb;
float spec;
float range;
float intensity;
};
PointLight* pointLight = nullptr;
PointLight PL =
{
Vector3(0.0f, 0.0f, -3.0f),
0.8f,
0.2f,
0.0f,
100.0f,
1.0f
};
pointLight = &PL;
D3D11_BUFFER_DESC lightBufferDesc;
memset(&lightBufferDesc, 0, sizeof(lightBufferDesc));
lightBufferDesc.BindFlags = D3D11_BIND_CONSTANT_BUFFER;
lightBufferDesc.Usage = D3D11_USAGE_DEFAULT;
lightBufferDesc.StructureByteStride = 0;
lightBufferDesc.MiscFlags = 0;
lightBufferDesc.ByteWidth = sizeof(PointLight);
D3D11_SUBRESOURCE_DATA pointLightData;
memset(&pointLightData, 0, sizeof(pointLightData));
pointLightData.pSysMem = &PL;
gDevice->CreateBuffer(&lightBufferDesc, &pointLightData, &lightBuffer);
and in render() i run
gDeviceContext->PSSetConstantBuffers(0, 1, &lightBuffer);

Answer 1

Texture will be black if s.x, s.y, s.z equal to zero.
s.x = (s.x * diff * nDotL + s.x * amb);
s.y = (s.y * diff * nDotL + s.y * amb);
s.z = (s.z * diff * nDotL + s.z * amb);
Try to change diff and amb with a non-zero constant so that you can be sure that you set contant buffer correctly or not. If after you change them, it's still black then it must be nDotL and/or sampled texture that is zero. Then try with non-zero constant for texture sample. If they're still causing texture to look black then your light vector calculation is the culprit.