Nearest Neighbour filtering

docs/source/about/advanced_usage.rst

@@ -434,6 +434,21 @@ dwmflush
 
       dwmflush = enabled
 
+point_filtering
+^^^^^^^^^^^^^^^
+
+**Description**
+   Enable nearest point filtering for scaling from captured screen to streamed video.
+   May be useful for retro games or pixel-perfect streaming to low-resolution devices (PlayStation Vita, for example).
+
+**Default**
+   ``disabled``
+
+**Example**
+   .. code-block:: text
+
+      point_filtering = enabled
+
 Audio
 -----
 

src/config.cpp

@@ -379,7 +379,8 @@ namespace config {
     {},  // encoder
     {},  // adapter_name
     {},  // output_name
-    true  // dwmflush
+    true,  // dwmflush
+    false //point_filtering
   };
 
   audio_t audio {
@@ -969,6 +970,7 @@ namespace config {
     string_f(vars, "adapter_name", video.adapter_name);
     string_f(vars, "output_name", video.output_name);
     bool_f(vars, "dwmflush", video.dwmflush);
+    bool_f(vars, "point_filtering", video.point_filtering);
 
     path_f(vars, "pkey", nvhttp.pkey);
     path_f(vars, "cert", nvhttp.cert);

src/config.h

@@ -60,6 +60,7 @@ namespace config {
     std::string adapter_name;
     std::string output_name;
     bool dwmflush;
+    bool point_filtering;
   };
 
   struct audio_t {

src/platform/linux/graphics.cpp

@@ -4,6 +4,7 @@
  */
 #include "graphics.h"
 #include "src/video.h"
+#include "src/config.h"
 
 #include <fcntl.h>
 
@@ -48,13 +49,19 @@ namespace gl {
     ctx.GenTextures(textures.size(), textures.begin());
 
     float color[] = { 0.0f, 0.0f, 0.0f, 1.0f };
+
+    GLint filtering = GL_LINEAR;
+    if (config::video.point_filtering)
+    {
+      filtering = GL_POINT;
+    }
 
     for (auto tex : textures) {
       gl::ctx.BindTexture(GL_TEXTURE_2D, tex);
       gl::ctx.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);  // x
       gl::ctx.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);  // y
-      gl::ctx.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
-      gl::ctx.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+      gl::ctx.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filtering);
+      gl::ctx.TexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filtering);
       gl::ctx.TexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, color);
     }
 

src/platform/windows/display_vram.cpp

@@ -18,6 +18,7 @@ extern "C" {
 #include "misc.h"
 #include "src/main.h"
 #include "src/video.h"
+#include "src/config.h"
 
 #define SUNSHINE_SHADERS_DIR SUNSHINE_ASSETS_DIR "/shaders/directx"
 namespace platf {
@@ -695,8 +696,14 @@ namespace platf::dxgi {
         return -1;
       }
 
+      D3D11_FILTER filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
+      if (config::video.point_filtering)
+      {
+        filter = D3D11_FILTER_MIN_MAG_MIP_POINT;
+      }
+
       D3D11_SAMPLER_DESC sampler_desc {};
-      sampler_desc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
+      sampler_desc.Filter = filter;
       sampler_desc.AddressU = D3D11_TEXTURE_ADDRESS_CLAMP;
       sampler_desc.AddressV = D3D11_TEXTURE_ADDRESS_CLAMP;
       sampler_desc.AddressW = D3D11_TEXTURE_ADDRESS_WRAP;
@@ -1263,8 +1270,14 @@ namespace platf::dxgi {
       return -1;
     }
 
+    D3D11_FILTER filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
+    if (config::video.point_filtering)
+    {
+      filter = D3D11_FILTER_MIN_MAG_MIP_POINT;
+    }
+
     D3D11_SAMPLER_DESC sampler_desc {};
-    sampler_desc.Filter = D3D11_FILTER_MIN_MAG_MIP_LINEAR;
+    sampler_desc.Filter = filter;
     sampler_desc.AddressU = D3D11_TEXTURE_ADDRESS_CLAMP;
     sampler_desc.AddressV = D3D11_TEXTURE_ADDRESS_CLAMP;
     sampler_desc.AddressW = D3D11_TEXTURE_ADDRESS_WRAP;

src_assets/common/assets/web/config.html

@@ -594,6 +594,17 @@ <h1 class="my-4">Configuration</h1>
           Disable if you encounter any VSync-related issues.
         </div>
       </div>
+      <div class="mb-3" v-if="platform === 'windows' || platform === 'linux'">
+        <label for="point_filtering" class="form-label">Nearest Point filtering</label>
+        <select id="point_filtering" class="form-select" v-model="config.point_filtering">
+          <option value="disabled">Disabled</option>
+          <option value="enabled">Enabled</option>
+        </select>
+        <div class="form-text">
+          Enable this to not interpolate captured screen to video size.<br />
+          May be useful for pixel-perfect streaming.
+        </div>
+      </div>
       <div class="mb-3 config-page" v-if="platform === 'linux'">
         <label for="output_name" class="form-label">Monitor number</label>
         <input
@@ -1028,6 +1039,7 @@ <h1 class="my-4">Configuration</h1>
     "controller": "enabled",
     "install_steam_audio_drivers": "enabled",
     "dwmflush": "enabled",
+    "point_filtering": "enabled",
     "encoder": "",
     "fps": "[10,30,60,90,120]",
     "gamepad": "auto",