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// This code contains NVIDIA Confidential Information and is disclosed to you
// under a form of NVIDIA software license agreement provided separately to you.
//
// Notice
// NVIDIA Corporation and its licensors retain all intellectual property and
// proprietary rights in and to this software and related documentation and
// any modifications thereto. Any use, reproduction, disclosure, or
// distribution of this software and related documentation without an express
// license agreement from NVIDIA Corporation is strictly prohibited.
//
// ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES
// NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
// THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT,
// MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE.
//
// Information and code furnished is believed to be accurate and reliable.
// However, NVIDIA Corporation assumes no responsibility for the consequences of use of such
// information or for any infringement of patents or other rights of third parties that may
// result from its use. No license is granted by implication or otherwise under any patent
// or patent rights of NVIDIA Corporation. Details are subject to change without notice.
// This code supersedes and replaces all information previously supplied.
// NVIDIA Corporation products are not authorized for use as critical
// components in life support devices or systems without express written approval of
// NVIDIA Corporation.
//
// Copyright (c) 2008-2021 NVIDIA Corporation. All rights reserved.
#pragma once
#include "Common.h"
#include "UserTexture.h"
namespace GFSDK
{
namespace SSAO
{
#if !SUPPORT_D3D11
struct D3D11_VIEWPORT
{
FLOAT TopLeftX;
FLOAT TopLeftY;
FLOAT Width;
FLOAT Height;
FLOAT MinDepth;
FLOAT MaxDepth;
};
#endif
#if SUPPORT_D3D12
struct InputViewport : public D3D12_VIEWPORT
#else
struct InputViewport : public D3D11_VIEWPORT
#endif
{
InputViewport()
{
ZERO_STRUCT(*this);
}
static bool HasValidDimensions(const GFSDK_SSAO_InputViewport& V)
{
return (V.Width != 0 && V.Height != 0);
}
static bool HasValidDepthRange(const GFSDK_SSAO_InputViewport& V)
{
// According to the DX11 spec:
// Viewport MinDepth and MaxDepth must both be in the range [0.0f...1.0f], and MinDepth must be less-than or equal-to MaxDepth.
// Viewport parameters are validated in the runtime such that values outside these ranges will never be passed to the DDI.
return (V.MinDepth >= 0.f && V.MinDepth <= 1.f &&
V.MaxDepth >= 0.f && V.MaxDepth <= 1.f &&
V.MinDepth <= V.MaxDepth);
}
static bool CoversFullTexture(const GFSDK_SSAO_InputViewport& V, const SSAO::UserTextureDesc& Texture)
{
return (V.TopLeftX == 0.f &&
V.TopLeftY == 0.f &&
V.Width == (FLOAT)Texture.Width &&
V.Height == (FLOAT)Texture.Height);
}
GFSDK_SSAO_Status Init(const GFSDK_SSAO_InputViewport& Viewport, const SSAO::UserTextureDesc& Texture)
{
if (!Viewport.Enable)
{
return InitFromTexture(Texture);
}
return InitFromViewport(Viewport, Texture);
}
bool RectCoversFullInputTexture;
private:
GFSDK_SSAO_Status InitFromTexture(const SSAO::UserTextureDesc& Texture)
{
TopLeftX = 0.f;
TopLeftY = 0.f;
Width = FLOAT(Texture.Width);
Height = FLOAT(Texture.Height);
MinDepth = 0.f;
MaxDepth = 1.f;
RectCoversFullInputTexture = true;
return GFSDK_SSAO_OK;
}
GFSDK_SSAO_Status InitFromViewport(const GFSDK_SSAO_InputViewport& Viewport, const SSAO::UserTextureDesc& Texture)
{
if (!HasValidDimensions(Viewport))
{
return GFSDK_SSAO_INVALID_VIEWPORT_DIMENSIONS;
}
if (!HasValidDepthRange(Viewport))
{
return GFSDK_SSAO_INVALID_VIEWPORT_DEPTH_RANGE;
}
TopLeftX = (FLOAT)Viewport.TopLeftX;
TopLeftY = (FLOAT)Viewport.TopLeftY;
Width = (FLOAT)Viewport.Width;
Height = (FLOAT)Viewport.Height;
MinDepth = Viewport.MinDepth;
MaxDepth = Viewport.MaxDepth;
Width = Min(Width, FLOAT(Texture.Width) - TopLeftX);
Height = Min(Height, FLOAT(Texture.Height) - TopLeftY);
RectCoversFullInputTexture = CoversFullTexture(Viewport, Texture);
return GFSDK_SSAO_OK;
}
};
} // namespace SSAO
} // namespace GFSDK
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