Add support for HDR10 output

include/sway/commands.h

@@ -290,6 +290,7 @@ sway_cmd output_cmd_color_profile;
 sway_cmd output_cmd_disable;
 sway_cmd output_cmd_dpms;
 sway_cmd output_cmd_enable;
+sway_cmd output_cmd_hdr;
 sway_cmd output_cmd_max_render_time;
 sway_cmd output_cmd_mode;
 sway_cmd output_cmd_modeline;

include/sway/config.h

@@ -261,7 +261,7 @@ enum scale_filter_mode {
 };
 
 enum render_bit_depth {
-	RENDER_BIT_DEPTH_DEFAULT, // the default is currently 8
+	RENDER_BIT_DEPTH_DEFAULT, // the default is currently 8 for SDR, 10 for HDR
 	RENDER_BIT_DEPTH_6,
 	RENDER_BIT_DEPTH_8,
 	RENDER_BIT_DEPTH_10,
@@ -291,6 +291,7 @@ struct output_config {
 	bool set_color_transform;
 	struct wlr_color_transform *color_transform;
 	int allow_tearing;
+	int hdr;
 
 	char *background;
 	char *background_option;

include/sway/output.h

@@ -68,7 +68,9 @@ struct sway_output {
 	uint32_t refresh_nsec;
 	int max_render_time; // In milliseconds
 	struct wl_event_source *repaint_timer;
+
 	bool allow_tearing;
+	bool hdr;
 };
 
 struct sway_output_non_desktop {

sway/commands/output.c

@@ -15,6 +15,7 @@ static const struct cmd_handler output_handlers[] = {
 	{ "disable", output_cmd_disable },
 	{ "dpms", output_cmd_dpms },
 	{ "enable", output_cmd_enable },
+	{ "hdr", output_cmd_hdr },
 	{ "max_render_time", output_cmd_max_render_time },
 	{ "mode", output_cmd_mode },
 	{ "modeline", output_cmd_modeline },

sway/commands/output/hdr.c

@@ -0,0 +1,37 @@
+#include <strings.h>
+#include "sway/commands.h"
+#include "sway/config.h"
+#include "sway/output.h"
+#include "util.h"
+
+struct cmd_results *output_cmd_hdr(int argc, char **argv) {
+	if (!config->handler_context.output_config) {
+		return cmd_results_new(CMD_FAILURE, "Missing output config");
+	}
+	if (argc == 0) {
+		return cmd_results_new(CMD_INVALID, "Missing hdr argument");
+	}
+
+	bool current = false;
+	if (strcasecmp(argv[0], "toggle") == 0) {
+		const char *oc_name = config->handler_context.output_config->name;
+		if (strcmp(oc_name, "*") == 0) {
+			return cmd_results_new(CMD_INVALID,
+				"Cannot apply toggle to all outputs");
+		}
+
+		struct sway_output *output = all_output_by_name_or_id(oc_name);
+		if (!output) {
+			return cmd_results_new(CMD_FAILURE,
+				"Cannot apply toggle to unknown output %s", oc_name);
+		}
+
+		current = output->hdr;
+	}
+
+	config->handler_context.output_config->hdr = parse_boolean(argv[0], current);
+
+	config->handler_context.leftovers.argc = argc - 1;
+	config->handler_context.leftovers.argv = argv + 1;
+	return NULL;
+}

sway/config/output.c

@@ -79,6 +79,7 @@ struct output_config *new_output_config(const char *name) {
 	oc->color_transform = NULL;
 	oc->power = -1;
 	oc->allow_tearing = -1;
+	oc->hdr = -1;
 	return oc;
 }
 
@@ -154,6 +155,9 @@ static void supersede_output_config(struct output_config *dst, struct output_con
 	if (src->allow_tearing != -1) {
 		dst->allow_tearing = -1;
 	}
+	if (src->hdr != -1) {
+		dst->hdr = -1;
+	}
 }
 
 // merge_output_config sets all fields in dst that were set in src
@@ -229,6 +233,9 @@ static void merge_output_config(struct output_config *dst, struct output_config
 	if (src->allow_tearing != -1) {
 		dst->allow_tearing = src->allow_tearing;
 	}
+	if (src->hdr != -1) {
+		dst->hdr = src->hdr;
+	}
 }
 
 void store_output_config(struct output_config *oc) {
@@ -271,11 +278,11 @@ void store_output_config(struct output_config *oc) {
 
 	sway_log(SWAY_DEBUG, "Config stored for output %s (enabled: %d) (%dx%d@%fHz "
 		"position %d,%d scale %f subpixel %s transform %d) (bg %s %s) (power %d) "
-		"(max render time: %d) (allow tearing: %d)",
+		"(max render time: %d) (allow tearing: %d) (hdr: %d)",
 		oc->name, oc->enabled, oc->width, oc->height, oc->refresh_rate,
 		oc->x, oc->y, oc->scale, sway_wl_output_subpixel_to_string(oc->subpixel),
 		oc->transform, oc->background, oc->background_option, oc->power,
-		oc->max_render_time, oc->allow_tearing);
+		oc->max_render_time, oc->allow_tearing, oc->hdr);
 
 	// If the configuration was not merged into an existing configuration, add
 	// it to the list. Otherwise we're done with it and can free it.
@@ -341,6 +348,41 @@ static void set_modeline(struct wlr_output *output,
 #endif
 }
 
+static void set_hdr(struct wlr_output *output, struct wlr_output_state *pending, bool enabled) {
+	enum wlr_color_named_primaries primaries = WLR_COLOR_NAMED_PRIMARIES_BT2020;
+	enum wlr_color_transfer_function tf = WLR_COLOR_TRANSFER_FUNCTION_ST2084_PQ;
+	if (enabled && !(output->supported_primaries & primaries)) {
+		sway_log(SWAY_ERROR, "Cannot enable HDR on output %s: BT2020 primaries not supported by output",
+			output->name);
+		enabled = false;
+	}
+	if (enabled && !(output->supported_transfer_functions & WLR_COLOR_TRANSFER_FUNCTION_ST2084_PQ)) {
+		sway_log(SWAY_ERROR, "Cannot enable HDR on output %s: PQ transfer function not supported by output",
+			output->name);
+		enabled = false;
+	}
+	if (enabled && !server.renderer->features.output_color_transform) {
+		sway_log(SWAY_ERROR, "Cannot enable HDR on output %s: renderer doesn't support output color transforms",
+			output->name);
+		enabled = false;
+	}
+
+	if (!enabled) {
+		if (output->supported_primaries != 0 || output->supported_transfer_functions != 0) {
+			sway_log(SWAY_DEBUG, "Disabling HDR on output %s", output->name);
+			wlr_output_state_set_image_description(pending, NULL);
+		}
+		return;
+	}
+
+	sway_log(SWAY_DEBUG, "Enabling HDR on output %s", output->name);
+	const struct wlr_output_image_description image_desc = {
+		.primaries = primaries,
+		.transfer_function = tf,
+	};
+	wlr_output_state_set_image_description(pending, &image_desc);
+}
+
 /* Some manufacturers hardcode the aspect-ratio of the output in the physical
  * size field. */
 static bool phys_size_is_aspect_ratio(struct wlr_output *output) {
@@ -415,6 +457,16 @@ static enum render_bit_depth bit_depth_from_format(uint32_t render_format) {
 	return RENDER_BIT_DEPTH_DEFAULT;
 }
 
+static enum render_bit_depth get_config_render_bit_depth(const struct output_config *oc) {
+	if (oc && oc->render_bit_depth != RENDER_BIT_DEPTH_DEFAULT) {
+		return oc->render_bit_depth;
+	}
+	if (oc && oc->hdr == 1) {
+		return RENDER_BIT_DEPTH_10;
+	}
+	return RENDER_BIT_DEPTH_8;
+}
+
 static bool render_format_is_bgr(uint32_t fmt) {
 	return fmt == DRM_FORMAT_XBGR2101010 || fmt == DRM_FORMAT_XBGR8888;
 }
@@ -485,24 +537,29 @@ static void queue_output_config(struct output_config *oc,
 		}
 	}
 
-	if (oc && oc->render_bit_depth != RENDER_BIT_DEPTH_DEFAULT) {
-		if (oc->render_bit_depth == RENDER_BIT_DEPTH_10 &&
-			bit_depth_from_format(output->wlr_output->render_format) == oc->render_bit_depth) {
+	enum render_bit_depth render_bit_depth = get_config_render_bit_depth(oc);
+	if (render_bit_depth == RENDER_BIT_DEPTH_10 &&
+			bit_depth_from_format(output->wlr_output->render_format) == render_bit_depth) {
 		// 10-bit was set successfully before, try to save some tests by reusing the format
 		wlr_output_state_set_render_format(pending, output->wlr_output->render_format);
-		} else if (oc->render_bit_depth == RENDER_BIT_DEPTH_10) {
+	} else if (render_bit_depth == RENDER_BIT_DEPTH_10) {
 		wlr_output_state_set_render_format(pending, DRM_FORMAT_XRGB2101010);
-		} else if (oc->render_bit_depth == RENDER_BIT_DEPTH_6){
+	} else if (render_bit_depth == RENDER_BIT_DEPTH_6) {
 		wlr_output_state_set_render_format(pending, DRM_FORMAT_RGB565);
 	} else {
 		wlr_output_state_set_render_format(pending, DRM_FORMAT_XRGB8888);
 	}
-	} else {
-		wlr_output_state_set_render_format(pending, DRM_FORMAT_XRGB8888);
+
+	bool hdr = oc && oc->hdr == 1;
+	if (hdr && oc->color_transform != NULL) {
+		sway_log(SWAY_ERROR, "Cannot HDR on output %s: output has an ICC profile set", wlr_output->name);
+		hdr = false;
 	}
+	set_hdr(wlr_output, pending, hdr);
 }
 
-static bool finalize_output_config(struct output_config *oc, struct sway_output *output) {
+static bool finalize_output_config(struct output_config *oc, struct sway_output *output,
+		const struct wlr_output_state *applied) {
 	if (output == root->fallback_output) {
 		return false;
 	}
@@ -561,6 +618,7 @@ static bool finalize_output_config(struct output_config *oc, struct sway_output
 
 	output->max_render_time = oc && oc->max_render_time > 0 ? oc->max_render_time : 0;
 	output->allow_tearing = oc && oc->allow_tearing > 0;
+	output->hdr = applied->image_description != NULL;
 
 	return true;
 }
@@ -785,10 +843,7 @@ static bool search_render_format(struct search_context *ctx, size_t output_idx)
 
 	const struct wlr_drm_format_set *primary_formats =
 		wlr_output_get_primary_formats(wlr_output, server.allocator->buffer_caps);
-	enum render_bit_depth needed_bits = RENDER_BIT_DEPTH_8;
-	if (cfg->config && cfg->config->render_bit_depth != RENDER_BIT_DEPTH_DEFAULT) {
-		needed_bits = cfg->config->render_bit_depth;
-	}
+	enum render_bit_depth needed_bits = get_config_render_bit_depth(cfg->config);
 	for (size_t idx = 0; fmts[idx] != DRM_FORMAT_INVALID; idx++) {
 		enum render_bit_depth format_bits = bit_depth_from_format(fmts[idx]);
 		if (needed_bits < format_bits) {
@@ -943,9 +998,10 @@ static bool apply_resolved_output_configs(struct matched_output_config *configs,
 
 	for (size_t idx = 0; idx < configs_len; idx++) {
 		struct matched_output_config *cfg = &configs[idx];
+		struct wlr_backend_output_state *backend_state = &states[idx];
 		sway_log(SWAY_DEBUG, "Finalizing config for %s",
 			cfg->output->wlr_output->name);
-		finalize_output_config(cfg->config, cfg->output);
+		finalize_output_config(cfg->config, cfg->output, &backend_state->base);
 	}
 
 	// Output layout being applied in finalize_output_config can shift outputs

sway/ipc-json.c

@@ -406,8 +406,8 @@ static void ipc_json_describe_enabled_output(struct sway_output *output,
 	}
 
 	json_object_object_add(object, "max_render_time", json_object_new_int(output->max_render_time));
-
 	json_object_object_add(object, "allow_tearing", json_object_new_boolean(output->allow_tearing));
+	json_object_object_add(object, "hdr", json_object_new_boolean(output->hdr));
 }
 
 json_object *ipc_json_describe_disabled_output(struct sway_output *output) {

sway/meson.build

@@ -195,6 +195,7 @@ sway_sources = files(
 	'commands/output/disable.c',
 	'commands/output/dpms.c',
 	'commands/output/enable.c',
+	'commands/output/hdr.c',
 	'commands/output/max_render_time.c',
 	'commands/output/mode.c',
 	'commands/output/position.c',

sway/sway-ipc.7.scd

@@ -244,6 +244,9 @@ following properties:
 |- rect
 :  object
 :  The bounds for the output consisting of _x_, _y_, _width_, and _height_
+|- hdr
+:  boolean
+:  Whether HDR is enabled
 
 
 *Example Reply:*

sway/sway-output.5.scd

@@ -210,6 +210,17 @@ must be separated by one space. For example:
 
 	This setting only has effect when a window is fullscreen on the output.
 
+*output* <name> hdr on|off|toggle
+	Enables or disables HDR (High Dynamic Range). HDR enables a larger color
+	gamut and brightness range. HDR uses the BT2020 primaries and the PQ
+	transfer function.
+
+	When HDR is enabled, _render_bit_depth_ is implicitly set to 10 unless
+	explicitly configured. Using a lower render bit depth may result in color
+	banding artifacts.
+
+	HDR needs to be supported by the output and renderer to be enabled.
+
 # SEE ALSO
 
 *sway*(5) *sway-input*(5)

swaymsg/main.c

@@ -189,7 +189,8 @@ static void pretty_print_output(json_object *o) {
 	json_object_object_get_ex(o, "current_workspace", &ws);
 	json_object_object_get_ex(o, "non_desktop", &non_desktop);
 	json_object *make, *model, *serial, *scale, *scale_filter, *subpixel,
-		*transform, *max_render_time, *adaptive_sync_status, *allow_tearing;
+		*transform, *max_render_time, *adaptive_sync_status, *allow_tearing,
+		*hdr;
 	json_object_object_get_ex(o, "make", &make);
 	json_object_object_get_ex(o, "model", &model);
 	json_object_object_get_ex(o, "serial", &serial);
@@ -200,6 +201,7 @@ static void pretty_print_output(json_object *o) {
 	json_object_object_get_ex(o, "max_render_time", &max_render_time);
 	json_object_object_get_ex(o, "adaptive_sync_status", &adaptive_sync_status);
 	json_object_object_get_ex(o, "allow_tearing", &allow_tearing);
+	json_object_object_get_ex(o, "hdr", &hdr);
 	json_object *x, *y;
 	json_object_object_get_ex(rect, "x", &x);
 	json_object_object_get_ex(rect, "y", &y);
@@ -261,6 +263,7 @@ static void pretty_print_output(json_object *o) {
 
 		printf("  Allow tearing: %s\n",
 			json_object_get_boolean(allow_tearing) ? "yes" : "no");
+		printf("  HDR: %s\n", json_object_get_boolean(hdr) ? "on" : "off");
 	} else {
 		printf(
 			"Output %s '%s %s %s' (disabled)\n",