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<h1>Change Log<a class="headerlink" href="#change-log" title="Permalink to this headline">¶</a></h1>
<p><strong>NVIDIA HBAO+ 4.0.</strong></p>
<p><strong>New in release 4.0</strong></p>
<ul class="simple">
<li>Add a StepCount parameter. The default value behaves the same as in previous HBAO+ versions.</li>
<li>Added support for a second input depth texture (to reduce halo artifacts behind foreground objects).</li>
<li>Fixed possible crash bug (released PSOs still in use on the GPU) when changing AO parameters at runtime on DX12.</li>
<li>Removed the two-pass-blend option from the DX11 interface.</li>
<li>Removed support for OpenGL.</li>
</ul>
<p><strong>New in release 3.1</strong></p>
<ul class="simple">
<li>The D3D11 non-UWP DLL now calls NVAPI (when available) to disable any SLI transfers for all render targets.</li>
<li>The D3D12 RenderAO call now resets the ScissorRect.</li>
<li>The PowerExponent parameter is now clamped to 4.f (was 8.f).</li>
</ul>
<p><strong>New in release 3.0</strong></p>
<ul class="simple">
<li>Added entry points for D3D12.</li>
<li>Now shipping separate DLLs and LIB files for D3D11 and GL.</li>
<li>Replaced the DetailAO & CoarseAO parameters with SmallScaleAO & LargeScaleAO.</li>
<li>Replaced pointers with references in the API.</li>
<li>Added the ForegroundAO & BackgroundAO parameters.</li>
<li>Added per-component debug-normal visualization modes in GFSDK_SSAO_RenderMask.</li>
<li>Added support for two-pass AO blending + depth-stencil masking.</li>
<li>Removed the BLUR_RADIUS_8 mode (BLUR_RADIUS_4 looks better in general, and runs faster).</li>
<li>Removed the PER_SAMPLE_AO MSAA mode.</li>
</ul>
<p><strong>New in release 2.4</strong></p>
<ul class="simple">
<li>Added support for Mac OS X.</li>
<li>Added the DepthClampMode parameter.</li>
<li>Added the GFSDK_SSAO_GetVersion function.</li>
<li>The input viewport and matrices are now passed by value instead of by pointer.</li>
<li>The input viewport parameter is now optional. By default, a full-resolution viewport is used.</li>
</ul>
<p><strong>New in release 2.3</strong></p>
<ul class="simple">
<li>The input normal data are now passed by value instead of by pointer (less error prone).</li>
<li>Removed the INVALID_VIEWPORT_DIMENSIONS error code. Input viewports larger than the input textures are now supported.</li>
<li>Added support for MSAA input VIEW_DEPTHS for DX11 and GL.</li>
<li>Added support for VIEW_DEPTHS with partial input viewports for DX11.</li>
<li>Added the DepthStorage parameter in GFSDK_SSAO_Parameters.</li>
</ul>
<p><strong>New in release 2.2</strong></p>
<ul class="simple">
<li>GL: The RenderAO call now saves & restores all the relevant GL states it alters internally.</li>
<li>GL: Added the GFSDK_SSAO_GLFunctions argument to GFSDK_SSAO_CreateContext_GL.</li>
<li>GL: Added support for MSAA input textures.</li>
<li>The GFSDK_SSAO_DRAW_DEBUG_N mode now outputs float4(-InternalViewNormal.xyz, 0).</li>
<li>Changed the blur weights of BLUR_RADIUS_2 and BLUR_RADIUS_4 to support larger sharpness values.</li>
</ul>
<p><strong>New in release 2.1</strong></p>
<ul class="simple">
<li>Optimize the case of Params.DetailAO == 0.f and Input.pNormalData != NULL.</li>
<li>Added a parameter to control the sharpness of the optional GFSDK_SSAO_DepthThreshold.</li>
<li>GL: Added quality/performance parameters in GFSDK_SSAO_Parameters_GL.</li>
</ul>
<p><strong>New in release 2.0</strong></p>
<ul class="simple">
<li>Added entry points for OpenGL 3.2.</li>
<li>Added support for non-zero input viewport origins.</li>
<li>Added the GFSDK_SSAO_BLUR_RADIUS_2 mode.</li>
</ul>
<p><strong>New in release 1.5</strong></p>
<ul class="simple">
<li>Renamed the SceneScale parameter to MetersToViewSpaceUnits.</li>
<li>Added the GFSDK_SSAO_HARDWARE_DEPTHS_SUB_RANGE depth-texture type.</li>
<li>Added option to supersample the AO when using MSAA input and output textures (GFSDK_SSAO_PER_SAMPLE_AO).</li>
<li>Added PreCreateRenderTargets entry point (optional).</li>
</ul>
<p><strong>New in release 1.4</strong></p>
<ul class="simple">
<li>Added error codes: GFSDK_SSAO_INVALID_VIEWPORT_DEPTH_RANGE and GFSDK_SSAO_UNSUPPORTED_VIEWPORT_DIMENSIONS.</li>
<li>Removed the GFSDK_SSAO_PERFORMANCE mode.</li>
</ul>
<p><strong>New in release 1.3</strong></p>
<ul class="simple">
<li>Moved the API to a class interface.</li>
<li>Added an optional SSAO_DepthThreshold parameter, to hide potential z-buffer precision artifacts.</li>
<li>Added support for input-texture dimensions being larger than the viewport dimensions.</li>
<li>Added GFSDK_SSAO_BlurRadius option.</li>
<li>Added GFSDK_SSAO_BlurSharpnessProfile option.</li>
<li>Added GFSDK_SSAO_GPUConfiguration option.</li>
</ul>
<p><strong>New in release 1.2</strong></p>
<ul class="simple">
<li>Merged the SetInputDepths and SetInputNormals functions into a single SetInputData.</li>
<li>Removed the SetParameters function. The parameters are now passed as an argument to RenderAO.</li>
<li>Let the user specify a BlendState for compositing the AO to the OutputRTV. See CustomBlendState.</li>
<li>Added a normal-visualization debug mode: by calling RenderAO with RenderMask = RENDER_DEBUG_NORMAL_Z.</li>
<li>Added a GetBuildString function.</li>
</ul>
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