Ensure texture filtering happens in linear space

Adapt existing fix for Windows game capture.

browser-client.cpp

@@ -264,9 +264,31 @@ void BrowserClient::OnAcceleratedPaint(CefRefPtr<CefBrowser>, PaintElementType,
 
 	if (shared_handle != last_handle) {
 		obs_enter_graphics();
-		gs_texture_destroy(bs->texture);
+
+		if (bs->texture) {
+			if (bs->extra_texture) {
+				gs_texture_destroy(bs->extra_texture);
+				bs->extra_texture = nullptr;
+			}
+			gs_texture_destroy(bs->texture);
+			bs->texture = nullptr;
+		}
+
 		bs->texture = gs_texture_open_shared(
 			(uint32_t)(uintptr_t)shared_handle);
+		if (bs->texture) {
+			const uint32_t cx = gs_texture_get_width(bs->texture);
+			const uint32_t cy = gs_texture_get_height(bs->texture);
+			const gs_color_format format =
+				gs_texture_get_color_format(bs->texture);
+			const gs_color_format linear_format =
+				gs_generalize_format(format);
+			if (linear_format != format) {
+				bs->extra_texture = gs_texture_create(
+					cx, cy, linear_format, 1, nullptr, 0);
+			}
+		}
+
 		obs_leave_graphics();
 
 		last_handle = shared_handle;

obs-browser-source.cpp

@@ -563,6 +563,16 @@ void BrowserSource::Render()
 		gs_effect_t *effect = obs_get_base_effect(OBS_EFFECT_DEFAULT);
 #endif
 
+		bool linear_sample = extra_texture == NULL;
+		gs_texture_t *draw_texture = texture;
+		if (!linear_sample &&
+		    !obs_source_get_texcoords_centered(source)) {
+			gs_copy_texture(extra_texture, texture);
+			draw_texture = extra_texture;
+
+			linear_sample = true;
+		}
+
 		const bool previous = gs_framebuffer_srgb_enabled();
 		gs_enable_framebuffer_srgb(true);
 
@@ -571,12 +581,19 @@ void BrowserSource::Render()
 
 		gs_eparam_t *const image =
 			gs_effect_get_param_by_name(effect, "image");
-		gs_effect_set_texture(image, texture);
 
-		const uint32_t flip_flag = flip ? GS_FLIP_V : 0;
+		const char *tech;
+		if (linear_sample) {
+			gs_effect_set_texture_srgb(image, draw_texture);
+			tech = "Draw";
+		} else {
+			gs_effect_set_texture(image, draw_texture);
+			tech = "DrawSrgbDecompress";
+		}
 
-		while (gs_effect_loop(effect, "DrawSrgbDecompress"))
-			gs_draw_sprite(texture, flip_flag, 0, 0);
+		const uint32_t flip_flag = flip ? GS_FLIP_V : 0;
+		while (gs_effect_loop(effect, tech))
+			gs_draw_sprite(draw_texture, flip_flag, 0, 0);
 
 		gs_blend_state_pop();
 

obs-browser-source.hpp

@@ -64,6 +64,7 @@ struct BrowserSource {
 	std::string url;
 	std::string css;
 	gs_texture_t *texture = nullptr;
+	gs_texture_t *extra_texture = nullptr;
 	int width = 0;
 	int height = 0;
 	bool fps_custom = false;
@@ -83,6 +84,10 @@ struct BrowserSource {
 	{
 		if (texture) {
 			obs_enter_graphics();
+			if (extra_texture) {
+				gs_texture_destroy(extra_texture);
+				extra_texture = nullptr;
+			}
 			gs_texture_destroy(texture);
 			texture = nullptr;
 			obs_leave_graphics();