ui: Add display filter configuration

config_spec.yml

@@ -237,6 +237,10 @@ display:
     surface_scale:
       type: integer
       default: 1
+  filtering:
+    type: enum
+    values: [linear, nearest]
+    default: linear
   window:
     fullscreen_on_startup: bool
     fullscreen_exclusive: bool

ui/xui/gl-helpers.cc

@@ -888,6 +888,17 @@ void RenderFramebuffer(GLint tex, int width, int height, bool flip, float scale[
 {
     glActiveTexture(GL_TEXTURE0);
     glBindTexture(GL_TEXTURE_2D, tex);
+    
+    switch (g_config.display.filtering) {
+    case CONFIG_DISPLAY_FILTERING_LINEAR:
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+    break;
+    case CONFIG_DISPLAY_FILTERING_NEAREST:
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+    break;
+    }
 
     DecalShader *s = g_framebuffer_shader;
     s->flip = flip;

ui/xui/menubar.cc

@@ -203,6 +203,8 @@ void ShowMainMenu()
             ImGui::SameLine();
             HelpMarker("Controls how the rendered content should be scaled "
                        "into the window");
+            ImGui::Combo("Filter Method", &g_config.display.filtering,
+                         "Linear\0Nearest\0");
             ImGui::Combo("Aspect Ratio", &g_config.display.ui.aspect_ratio,
                          "Native\0Auto\0""4:3\0""16:9\0");
             if (ImGui::MenuItem("Fullscreen", "F11",