obs-filters: Add NVIDIA Blur Filter & Background Blur

This adds a Background Blur filter which blurs the background for a
foreground speaker identified by NVIDIA AI Greenscreen FX.
Secondly, this adds a Blur filter based on NVIDIA Video Effects,
leveraging the Background Blur Filter where the mask used just sets the
whole frame as background.

Signed-off-by: pkv <pkv@obsproject.com>

plugins/nv-filters/CMakeLists.txt

@@ -15,7 +15,7 @@ if(OS_WINDOWS)
 
   if(ENABLE_NVVFX)
     target_enable_feature(nv-filters "NVIDIA Video FX support" LIBNVVFX_ENABLED)
-    target_sources(nv-filters PRIVATE nvidia-greenscreen-filter.c)
+    target_sources(nv-filters PRIVATE nvidia-videofx-filter.c)
   else()
     target_disable_feature(nv-filters "NVIDIA Video FX support")
   endif()

plugins/nv-filters/data/locale/en-US.ini

@@ -14,3 +14,6 @@ Nvvfx.Method.Greenscreen.Threshold="Threshold"
 Nvvfx.OutdatedSDK="WARNING: Please upgrade both NVIDIA Video & Audio SDK. Your current version of Video SDK is outdated."
 Nvvfx.Method.Greenscreen.Processing="Mask refresh frequency in frames"
 Nvvfx.Method.Greenscreen.Processing.Hint="This alleviates GPU load by generating a mask every N frames only (2 on default)."
+Nvvfx.Method.BlurFilter="NVIDIA Blur Filter"
+Nvvfx.Method.BackgroundBlurFilter="NVIDIA Background Blur Filter"
+Nvvfx.Method.Blur.Strength="Blur Intensity"

plugins/nv-filters/data/rtx_blur.effect

@@ -0,0 +1,158 @@
+#include "color.effect"
+
+uniform float4x4 ViewProj;
+uniform texture2d image;
+uniform float multiplier;
+
+uniform texture2d blurred;
+
+sampler_state texSampler {
+	Filter    = Linear;
+	AddressU  = Clamp;
+	AddressV  = Clamp;
+};
+
+struct VertData {
+	float4 pos : POSITION;
+	float2 uv  : TEXCOORD0;
+};
+
+struct VertInOut {
+	float2 uv  : TEXCOORD0;
+	float4 pos : POSITION;
+};
+
+struct FragData {
+	float2 uv  : TEXCOORD0;
+};
+
+struct FragPos {
+	float4 pos : POSITION;
+};
+
+VertInOut VSDefault(VertData v_in)
+{
+	VertInOut v_out;
+	v_out.uv = v_in.uv;
+	v_out.pos = mul(float4(v_in.pos.xyz, 1.), ViewProj);
+	return v_out;
+}
+
+FragPos VSConvertUnorm(uint id : VERTEXID)
+{
+	float idHigh = float(id >> 1);
+	float idLow = float(id & uint(1));
+
+	float x = idHigh * 4.0 - 1.0;
+	float y = idLow * 4.0 - 1.0;
+
+	FragPos vert_out;
+	vert_out.pos = float4(x, y, 0.0, 1.0);
+	return vert_out;
+}
+
+float4 Mask(FragData f_in)
+{
+	float4 rgba = image.Sample(texSampler, f_in.uv);
+	rgba.rgb = max(float3(0.0, 0.0, 0.0), blurred.Sample(texSampler, f_in.uv).rgb / rgba.a);
+	return rgba;
+}
+
+float4 PSMask(FragData f_in) : TARGET
+{
+	float4 rgba = Mask(f_in);
+	return rgba;
+}
+
+float4 PSMaskMultiply(FragData f_in) : TARGET
+{
+	float4 rgba = Mask(f_in);
+	rgba.rgb *= multiplier;
+	return rgba;
+}
+
+float4 PSMaskTonemap(FragData f_in) : TARGET
+{
+	float4 rgba = Mask(f_in);
+	rgba.rgb = rec709_to_rec2020(rgba.rgb);
+	rgba.rgb = reinhard(rgba.rgb);
+	rgba.rgb = rec2020_to_rec709(rgba.rgb);
+	return rgba;
+}
+
+float4 PSMaskMultiplyTonemap(FragData f_in) : TARGET
+{
+	float4 rgba = Mask(f_in);
+	rgba.rgb *= multiplier;
+	rgba.rgb = rec709_to_rec2020(rgba.rgb);
+	rgba.rgb = reinhard(rgba.rgb);
+	rgba.rgb = rec2020_to_rec709(rgba.rgb);
+	return rgba;
+}
+
+float4 PSDefault(FragPos f_in) : TARGET
+{
+	float4 rgba = image.Load(int3(f_in.pos.xy, 0));
+	return rgba;
+}
+
+float4 PSConvertMultiply(FragPos f_in) : TARGET
+{
+	float4 rgba = image.Load(int3(f_in.pos.xy, 0));
+	rgba.rgb *= multiplier;
+	return rgba;
+}
+
+technique Draw
+{
+	pass
+	{
+		vertex_shader = VSDefault(v_in);
+		pixel_shader  = PSMask(f_in);
+	}
+}
+
+technique DrawMultiply
+{
+	pass
+	{
+		vertex_shader = VSDefault(v_in);
+		pixel_shader  = PSMaskMultiply(f_in);
+	}
+}
+
+technique DrawTonemap
+{
+	pass
+	{
+		vertex_shader = VSDefault(v_in);
+		pixel_shader  = PSMaskTonemap(f_in);
+	}
+}
+
+technique DrawMultiplyTonemap
+{
+	pass
+	{
+		vertex_shader = VSDefault(v_in);
+		pixel_shader  = PSMaskMultiplyTonemap(f_in);
+	}
+}
+
+technique ConvertUnorm
+{
+	pass
+	{
+		vertex_shader = VSConvertUnorm(id);
+		pixel_shader  = PSDefault(f_in);
+	}
+}
+
+technique ConvertUnormMultiply
+{
+	pass
+	{
+		vertex_shader = VSConvertUnorm(id);
+		pixel_shader  = PSConvertMultiply(f_in);
+	}
+}

plugins/nv-filters/nv-filters.c

@@ -14,6 +14,8 @@ extern void unload_nvidia_afx(void);
 #endif
 #ifdef LIBNVVFX_ENABLED
 extern struct obs_source_info nvidia_greenscreen_filter_info;
+extern struct obs_source_info nvidia_blur_filter_info;
+extern struct obs_source_info nvidia_background_blur_filter_info;
 extern bool load_nvidia_vfx(void);
 extern void unload_nvidia_vfx(void);
 #endif
@@ -29,8 +31,11 @@ bool obs_module_load(void)
 	obs_enter_graphics();
 	const bool direct3d = gs_get_device_type() == GS_DEVICE_DIRECT3D_11;
 	obs_leave_graphics();
-	if (direct3d && load_nvidia_vfx())
+	if (direct3d && load_nvidia_vfx()) {
 		obs_register_source(&nvidia_greenscreen_filter_info);
+		obs_register_source(&nvidia_blur_filter_info);
+		obs_register_source(&nvidia_background_blur_filter_info);
+	}
 #endif
 	return true;
 }