//-----------------------------------------------------------------------------
// Filename: Shader.hlsl
//-----------------------------------------------------------------------------
//
//-----------------------------------------------------------------------------

//--------------------------------------------------------------------------------------
// Constant Buffer Variables
//--------------------------------------------------------------------------------------

cbuffer WindowBuffer // Rarely, if ever, updates
{
    // ViewProjectionMatrix will go here
};

cbuffer NodeBuffer // Buffer from attached scene node; shared with other instances
{
    //NodeMatrix will go here
};

cbuffer InstanceBuffer // Buffer from instance; one per instance (might make into vertex buffer)
{
    // InstanceMatrix will go here
};

cbuffer SomethingSomething
{
    // Something will go here
};

cbuffer cbChangesEveryFrame : register(cb0)
{
    matrix WorldViewProjectionMatrix;
    matrix WorldMatrix;
    float4 vMeshColor;
};

//--------------------------------------------------------------------------------------
// Vertex Shader
//--------------------------------------------------------------------------------------
void ColourVS(
    float1x3 iPosition : POSITION,
    float1x3 iNormal   : NORMAL,
    float1x2 iUv       : TEXCOORD,
    // output
    out float3 oNormal   : NORMAL,
    out float2 oUv       : TEXCOORD0,
    out float4 oColor    : TEXCOORD1,
    out float4 oPos      : TEXCOORD2,
    out float4 oPosition : SV_POSITION)
{
    oPosition = mul(float4(iPosition, 1.0f), WorldViewProjectionMatrix);
    oUv = iUv;
    oColor = vMeshColor;
    oNormal = mul(iNormal, WorldMatrix);
    oPos = oPosition;

    return;
}

//--------------------------------------------------------------------------------------
// Textures and Samplers
//--------------------------------------------------------------------------------------
Texture2D texDiffuse : register(t0);
SamplerState samplerLinear : register(s0);

//--------------------------------------------------------------------------------------
// Pixel Shader
//--------------------------------------------------------------------------------------
float4 ColourPS(
    float3 normal   : NORMAL,
    float2 uv       : TEXCOORD0,
    float4 color    : TEXCOORD1,
    float4 position : TEXCOORD2) : SV_Target
{
    float depth = pow(position.z / position.w, 1000);
    float4 textureColor = texDiffuse.Sample(samplerLinear, uv);
    float diffuseFactor = dot(float3(1, 0, 0), normal);
    return float4(normal, 1.0f);
    //return float4(textureColor.xyz * diffuseFactor, 1.0f);
    //return float4(depth, depth, depth, 1.0f);
}