//--------------------------------------------------------------------------------------
// File: GameCode4_PS.hlsl - the pixel shader for GameCode4 (D3D11 renderer)
//
// Part of the GameCode4 Application
//
// GameCode4 is the sample application that encapsulates much of the source code
// discussed in "Game Coding Complete - 4th Edition" by Mike McShaffry and David
// "Rez" Graham, published by Charles River Media. 
// ISBN-10: 1133776574 | ISBN-13: 978-1133776574
//
// If this source code has found it's way to you, and you think it has helped you
// in any way, do the authors a favor and buy a new copy of the book - there are 
// detailed explanations in it that compliment this code well. Buy a copy at Amazon.com
// by clicking here: 
//    http://www.amazon.com/gp/product/1133776574/ref=olp_product_details?ie=UTF8&me=&seller=
//
// There's a companion web site at http://www.mcshaffry.com/GameCode/
// 
// The source code is managed and maintained through Google Code: 
//    http://code.google.com/p/gamecode4/
//
// (c) Copyright 2012 Michael L. McShaffry and David Graham
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser GPL v3
// as published by the Free Software Foundation.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 
// http://www.gnu.org/licenses/lgpl-3.0.txt for more details.
//
// You should have received a copy of the GNU Lesser GPL v3
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
//--------------------------------------------------------------------------------------

//--------------------------------------------------------------------------------------
// Globals
//--------------------------------------------------------------------------------------
cbuffer cbObjectColors : register( b0 )
{
	float4		g_vDiffuseObjectColor	: packoffset( c0 );
	float4		g_vAmbientObjectColor	: packoffset( c1 );
	bool		g_bHasTexture			: packoffset( c2.x );
};



//--------------------------------------------------------------------------------------
// Textures and Samplers
//--------------------------------------------------------------------------------------
Texture2D	g_txDiffuse : register( t0 );
SamplerState g_samLinear : register( s0 );

//--------------------------------------------------------------------------------------
// Input / Output structures
//--------------------------------------------------------------------------------------
struct PS_INPUT
{
	float4 vDiffuse		: COLOR0;
	float2 vTexcoord	: TEXCOORD0;
};

//--------------------------------------------------------------------------------------
// Pixel Shader
//--------------------------------------------------------------------------------------
float4 GameCode4_PSMain( PS_INPUT Input ) : SV_TARGET
{
	float4 vOutputColor;

	if (g_bHasTexture)
		vOutputColor = g_txDiffuse.Sample( g_samLinear, Input.vTexcoord ) * Input.vDiffuse;
	else
		vOutputColor = Input.vDiffuse;
	
	return vOutputColor;
}