Hi, I have a little shader written for basic lighting, I just rewrote the example from LearnOpenGL to hlsl but I can't render the red color at all. Thank you for all your responses.

float4 MainPS(VertexShaderOutput input) : SV_Target {
	float3 ambientLightColor = float3(1.0, 1.0, 1.0);
	float3 diffuseLightColor = float3(1.0, 1.0, 1.0);
	float3 specularLightColor = float3(1.0, 1.0, 1.0);

	// ambient
	float ambientStrength = 0.1;
	float3 ambient = ambientLightColor * ambientStrength;

	// diffuse
	float3 lightDir = normalize(pointLight - input.Position);
	float diff = max(dot(input.Normal.xyz, lightDir), 0.0);
	float3 diffuse = diff * diffuseLightColor;

	// specular
	float specularStrength = 0.4;
	float3 viewDir = normalize(cameraSource - input.Position);
	float3 reflectDir = reflect(-lightDir, input.Normal.xyz);
	float spec = pow(max(dot(viewDir, reflectDir), 0.0), 64);
	float3 specular = specularStrength * spec * specularLightColor;

	// output
	float3 outputColor = (ambient + diffuse + specular) * input.Color.rgb;

	return float4(outputColor, 1.0);
}

That block of code looks like it provides 3 white lights, although it doesn't have a cap so ambient + diffuse + specular can be greater than 100%, which might be okay for you. I'd say the next stop would be to double-check the input. Verify the data is what you expect, with an actual red-colored or red-textured object. Is the input.Color rgb value what you expect?

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@Jimmyberf Along the lines of what Frob suggested:

// output

float3 outputColor = saturate(ambient + diffuse + specular) * input.Color.rgb;