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The NVIDIA Image Scaling SDK provides a single spatial scaling and sharpening algorithm
for cross-platform support. The scaling algorithm uses a 6-tap scaling filter combined
with 4 directional scaling and adaptive sharpening filters, which creates nice smooth images
and sharp edges. In addition, the SDK provides a state-of-the-art adaptive directional sharpening algorithm for use in
applications where no scaling is required.
The directional scaling and sharpening algorithm is named NVScaler while the adaptive-directional-sharpening-only
algorithm is named NVSharpen. Both algorithms are provided as compute shaders and
developers are free to integrate them in their applications. Note that if you integrate NVScaler, you
should NOT integrate NVSharpen, as NVScaler already includes a sharpening pass
The call into the NVIDIA Image Scaling shaders must occur during the post-processing phase after tone-mapping. Applying the scaling in linear HDR in-game color-space may result in a sharpening effect that is either not visible or too strong. Since sharpening algorithms can enhance noisy or grainy regions, it is recommended that certain effects such as film grain should occur after NVScaler or NVSharpen. Low-pass filters such as motion blur or light bloom are recommended to be applied before NVScaler or NVSharpen to avoid sharpening attenuation.
NVIDIA Image Scaling shaders can process color textures stored as either LDR or HDR with the following restrictions:
- LDR
- The range of color values must be in the [0, 1] range
- The input color texture must be in display-referred color-space after tone mapping and OETF (gamma-correction) has been applied
- HDR PQ
- The range of color values must be in the [0, 1] range
- The input color texture must be in display-referred color-space after tone mapping with Rec.2020 PQ OETF applied
- HDR Linear
- The recommended range of color values is [0, 12.5], where luminance value (as per BT. 709) of 1.0 maps to brightness value of 80nits (sRGB peak) and 12.5 maps to 1000nits
- The input color texture may have luminance values that are either linear and scene-referred or linear and display-referred (after tone mapping)
If the input color texture sent to NVScaler/NVSharpen is in HDR format set NIS_HDR_MODE define to either NIS_HDR_MODE_LINEAR (1) or NIS_HDR_MODE_PQ (2).
Input and output formats are expected to be in the rages defined in previous section and should be specified using non-integer data types such as DXGI_FORMAT_R8G8B8A8_UNORM.
The scaler coefficients and USM coefficients format should be specified using float4 type such as DXGI_FORMAT_R32G32B32A32_FLOAT or DXGI_FORMAT_R16G16B16A16_FLOAT.
The game or application calling NVIDIA Image Scaling SDK shaders must ensure that the textures are in the correct state.
- Input color textures must be in pixel shader read state. Shader Resource View (SRV) in DirectX
- The output texture must be in read/write state. Unordered Access View (UAV) in DirectX
- The coefficients texture for NVScaler must be in read state. Shader Resource View (SRV) in DirectX
- The configuration variables must be passed as constant buffer. Constant Buffer View (CBV) in DirectX
- The sampler for texture pixel sampling. Linear clamp SamplerState in Direct
Include NIS_Scaler.h directly in your application or alternative use the provided NIS_Main.hlsl shader file. Use NIS_Config.h to get the ideal shader dispatch values for your platform, to configure the algorithm constant values (NVScalerUpdateConfig, and NVSharpenUpdateConfig), and to access the algorithm coefficients (coef_scale and coef_USM).
-
Device
NIS_Scaler.h : HLSL shader file
NIS_Main.hlsl : Main HLSL shader example (can be replaced by your own) -
Host Configuration
NIS_Config.h : Configuration structure
NIS_SCALER: default (1) NVScaler, (0) fast NVSharpen only, no upscaling
NIS_HDR_MODE: default(0) disabled, (1) Linear, (2) PQ
NIS_BLOCK_WIDTH: pixels per block width. Use GetOptimalBlockWidth query for your platform
NIS_BLOCK_HEIGHT: pixels per block height. Use GetOptimalBlockHeight query for your platform
NIS_THREAD_GROUP_SIZE: number of threads per group. Use GetOptimalThreadGroupSize query for your platform
NIS_USE_HALF_PRECISION: default(0) disabled, (1) enable half pression computation
NIS_HLSL_6_2: default (0) HLSL v5, (1) HLSL v6.2
NIS_VIEWPORT_SUPPORT: default(0) disabled, (1) enable input/output viewport support\
Default NVScaler shader constants:
[NIS_BLOCK_WIDTH, NIS_BLOCK_HEIGHT, NIS_THREAD_GROUP_SIZE] = [32, 24, 256]
Default NVSharpen shader constants:
[NIS_BLOCK_WIDTH, NIS_BLOCK_HEIGHT, NIS_THREAD_GROUP_SIZE] = [32, 32, 256]
To get optimal performance of NvScaler and NvSharpen for current and future hardware, it is recommended that the following API is used to obtain the values for NIS_BLOCK_WIDTH, NIS_BLOCK_HEIGHT, and NIS_THREAD_GROUP_SIZE.
enum class NISGPUArchitecture : uint32_t
{
NVIDIA_Generic = 0,
AMD_Generic = 1,
Intel_Generic = 2
};
struct NISOptimizer
{
bool isUpscaling;
NISGPUArchitecture gpuArch;
NISOptimizer(bool isUpscaling = true,
NISGPUArchitecture gpuArch = NISGPUArchitecture::NVIDIA_Generic);
uint32_t GetOptimalBlockWidth();
uint32_t GetOptimalBlockHeight();
uint32_t GetOptimalThreadGroupSize();
};
Use the following enum values for setting NIS_HDR_MODE
enum class NISHDRMode : uint32_t
{
None = 0,
Linear = 1,
PQ = 2
};
NIS_SCALER should be set to 1, and isUscaling should be pass as true.
NISOptimizer opt(true, NISGPUArchitecture::NVIDIA_Generic);
uint32_t blockWidth = opt.GetOptimalBlockWidth();
uint32_t blockHeight = opt.GetOptimalBlockHeight();
uint32_t threadGroupSize = opt.GetOptimalThreadGroupSize();
Defines defines;
defines.add("NIS_SCALER", true);
defines.add("NIS_HDR_MODE", hdrMode);
defines.add("NIS_BLOCK_WIDTH", blockWidth);
defines.add("NIS_BLOCK_HEIGHT", blockHeight);
defines.add("NIS_THREAD_GROUP_SIZE", threadGroupSize);
NVScalerCS = CompileComputeShader(device, "NIS_Main.hlsl”, &defines);
struct NISConfig
{
float kDetectRatio;
float kDetectThres;
float kMinContrastRatio;
float kRatioNorm;
...
};
NISConfig config;
createConstBuffer(&config, &csBuffer);
const int rowPitch = kFilterSize * 4;
const int imageSize = rowPitch * kPhaseCount;
createTexture2D(kFilterSize / 4, kPhaseCount, DXGI_FORMAT_R32G32B32A32_FLOAT, D3D11_USAGE_DEFAULT, coef_scaler, rowPitch, imageSize, &scalerTex);
createTexture2D(kFilterSize / 4, kPhaseCount, DXGI_FORMAT_R32G32B32A32_FLOAT, D3D11_USAGE_DEFAULT, coef_usm, rowPitch, imageSize, &usmTex);
createSRV(scalerTex.Get(), DXGI_FORMAT_R32G32B32A32_FLOAT, &scalerSRV);
createSRV(usmTex.Get(), DXGI_FORMAT_R32G32B32A32_FLOAT, &usmSRV);
createLinearClampSampler(&linearClampSampler);
Use the following API call to update the NVIDIA Image Scaling SDK configuration
void NVScalerUpdateConfig(NISConfig& config,
float sharpness,
uint32_t inputViewportOriginX, uint32_t inputViewportOriginY,
uint32_t inputViewportWidth, uint32_t inputViewportHeight,
uint32_t inputTextureWidth, uint32_t inputTextureHeight,
uint32_t outputViewportOriginX, uint32_t outputViewportOriginY,
uint32_t outputViewportWidth, uint32_t outputViewportHeight,
uint32_t outputTextureWidth, uint32_t outputTextureHeight,
NISHDRMode hdrMode = NISHDRMode::None
);
Update the constant buffer whenever the input size, sharpness, or scale changes
NVScalerUpdateConfig(m_config, sharpness,
0, 0, inputWidth, inputHeight, inputWidth, inputHeight,
0, 0, outputWidth, outputHeight, outputWidth, outputHeight,
NISHDRMode::None);
updateConstBuffer(&config, csBuffer.Get());
context->CSSetShaderResources(0, 1, input); // SRV
context->CSSetShaderResource (1, 1, scalerSRV.GetAddressOf());
context->CSSetShaderResource (2, 1, usmSRV.GetAddressOf());
context->CSSetUnorderedAccessViews(0, 1, output, nullptr);
context->CSSetSamplers(0, 1, linearClampSampler.GetAddressOf());
context->CSSetConstantBuffers(0, 1, csBuffer.GetAddressOf());
context->CSSetShader(NVScalerCS.Get(), nullptr, 0);
context->Dispatch(UINT(std::ceil(outputWidth / float(blockWidth))),
UINT(std::ceil(outputHeight / float(blockHeight))), 1);
If your application requires upscaling and sharpening do not use NVSharpen use NVScaler instead. Since NVScaler performs both operations, upscaling and sharpening, in one step, it performs faster and produces better image quality.
NIS_SCALER should be set to 0 and the optimizer isUscaling argument should be set as false.
bool isUpscaling = false;
NISOptimizer opt(isUpscaling, NISGPUArchitecture::NVIDIA_Generic);
uint32_t blockWidth = opt.GetOptimalBlockWidth();
uint32_t blockHeight = opt.GetOptimalBlockHeight();
uint32_t threadGroupSize = opt.GetOptimalThreadGroupSize();
Defines defines;
defines.add("NIS_DIRSCALER", isUpscaling);
defines.add("NIS_HDR_MODE", hdrMode);
defines.add("NIS_BLOCK_WIDTH", blockWidth);
defines.add("NIS_BLOCK_HEIGHT", blockHeight);
defines.add("NIS_THREAD_GROUP_SIZE", threadGroupSize);
NVSharpenCS = CompileComputeShader(device, "NIS_Main.hlsl”, &defines);
struct NISConfig
{
float kDetectRatio;
float kDetectThres;
float kMinContrastRatio;
float kRatioNorm;
...
};
NISConfig config;
createConstBuffer(&config, &csBuffer);
createLinearClampSampler(&linearClampSampler);
Use the following API call to update the NVIDIA Image Scaling SDK configuration. Since NVSharpen is a sharpening algorithm only the sharpness and input size are required. For upscaling with sharpening use NVScaler since it performs both operations at the same time.
void NVSharpenUpdateConfig(NISConfig& config, float sharpness,
uint32_t inputViewportOriginX, uint32_t inputViewportOriginY,
uint32_t inputViewportWidth, uint32_t inputViewportHeight,
uint32_t inputTextureWidth, uint32_t inputTextureHeight,
uint32_t outputViewportOriginX, uint32_t outputViewportOriginY,
NISHDRMode hdrMode = NISHDRMode::None
);
Update the constant buffer whenever the input size or sharpness changes.
NVSharpenUpdateConfig(m_config, sharpness,
0, 0, inputWidth, inputHeight, inputWidth, inputHeight,
0, 0, NISHDRMode::None);
updateConstBuffer(&config, csBuffer.Get());
context->CSSetShaderResources(0, 1, input);
context->CSSetUnorderedAccessViews(0, 1, output, nullptr);
context->CSSetSamplers(0, 1, linearClampSampler.GetAddressOf());
context->CSSetConstantBuffers(0, 1, csBuffer.GetAddressOf());
context->CSSetShader(NVSharpenCS.Get(), nullptr, 0);
context->Dispatch(UINT(std::ceil(outputWidth / float(blockWidth))),
UINT(std::ceil(outputHeight / float(blockHeight))), 1);
- Visual Studio 2019 : https://visualstudio.microsoft.com/downloads/
- Windows 10 SDK : https://developer.microsoft.com/en-us/windows/downloads/windows-10-sdk
- CMake 3.16 : https://cmake.org/download/
$> cd samples
$> mkdir build
$> cd build
$> cmake ..
Open the solution with Visual Studio 2019. Right-click the sample project and select "Set as Startup Project" before building the project
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