Per application color saturation support (#21)

* Initial implementation without fullscreen support

* Limit saturation to 2

* Fixed saturation not working for fullscreen applications like CSGO

* Fixed saturation ignoring border radius

* Updated README and sway.5 man page

* Rebased from Master

* Added command to README

* Fixed nitpicks

3 files changed, 6 insertions, 2 deletions

diff --git a/include/sway/commands.h b/include/sway/commands.h
index 1383295d..6f39c0c8 100644
--- a/include/sway/commands.h
+++ b/include/sway/commands.h
@@ -159,6 +159,7 @@ sway_cmd cmd_new_float;
 sway_cmd cmd_new_window;
 sway_cmd cmd_nop;
 sway_cmd cmd_opacity;
+sway_cmd cmd_saturation;
 sway_cmd cmd_new_float;
 sway_cmd cmd_new_window;
 sway_cmd cmd_no_focus;
diff --git a/include/sway/desktop/fx_renderer.h b/include/sway/desktop/fx_renderer.h
index e3b23411..0bbfcec3 100644
--- a/include/sway/desktop/fx_renderer.h
+++ b/include/sway/desktop/fx_renderer.h
@@ -16,6 +16,7 @@ struct gles2_tex_shader {
 	GLint size;
 	GLint position;
 	GLint radius;
+	GLint saturation;
 	GLint has_titlebar;
 };
 
@@ -79,10 +80,10 @@ void fx_renderer_scissor(struct wlr_box *box);
 
 bool fx_render_subtexture_with_matrix(struct fx_renderer *renderer, struct wlr_texture *wlr_texture,
 		const struct wlr_fbox *src_box, const struct wlr_box *dst_box, const float matrix[static 9],
-		float alpha, int radius, const bool has_titlebar);
+		float alpha, int radius, float saturation, const bool has_titlebar);
 
 bool fx_render_texture_with_matrix(struct fx_renderer *renderer, struct wlr_texture *wlr_texture,
-		const struct wlr_box *dst_box, const float matrix[static 9], float alpha, int radius,
+		const struct wlr_box *dst_box, const float matrix[static 9], float alpha, int radius, float saturation,
 		const bool has_titlebar);
 
 void fx_render_rect(struct fx_renderer *renderer, const struct wlr_box *box,
diff --git a/include/sway/tree/container.h b/include/sway/tree/container.h
index e8aa778a..ebe9568c 100644
--- a/include/sway/tree/container.h
+++ b/include/sway/tree/container.h
@@ -113,6 +113,8 @@ struct sway_container {
 	// Hidden scratchpad containers have a NULL parent.
 	bool scratchpad;
 
+	float saturation;
+
 	float alpha;
 
 	int corner_radius;