Shadow mapping render pass (#11244)

Co-authored-by: x2048 <codeforsmile@gmail.com>

2 files changed, 108 insertions, 2 deletions

diff --git a/builtin/mainmenu/tab_settings.lua b/builtin/mainmenu/tab_settings.lua
index 29744048a..8bc5bf8b6 100644
--- a/builtin/mainmenu/tab_settings.lua
+++ b/builtin/mainmenu/tab_settings.lua
@@ -43,6 +43,14 @@ local labels = {
 		fgettext("2x"),
 		fgettext("4x"),
 		fgettext("8x")
+	},
+	shadow_levels = {
+		fgettext("Disabled"),
+		fgettext("Very Low"),
+		fgettext("Low"),
+		fgettext("Medium"),
+		fgettext("High"),
+		fgettext("Ultra High")
 	}
 }
 
@@ -66,6 +74,10 @@ local dd_options = {
 	antialiasing = {
 		table.concat(labels.antialiasing, ","),
 		{"0", "2", "4", "8"}
+	},
+	shadow_levels = {
+		table.concat(labels.shadow_levels, ","),
+		{ "0", "1", "2", "3", "4", "5" }
 	}
 }
 
@@ -110,6 +122,15 @@ local getSettingIndex = {
 			end
 		end
 		return 1
+	end,
+	ShadowMapping = function()
+		local shadow_setting = core.settings:get("shadow_levels")
+		for i = 1, #dd_options.shadow_levels[2] do
+			if shadow_setting == dd_options.shadow_levels[2][i] then
+				return i
+			end
+		end
+		return 1
 	end
 }
 
@@ -197,7 +218,10 @@ local function formspec(tabview, name, tabdata)
 			"checkbox[8.25,1.5;cb_waving_leaves;" .. fgettext("Waving Leaves") .. ";"
 					.. dump(core.settings:get_bool("enable_waving_leaves")) .. "]" ..
 			"checkbox[8.25,2;cb_waving_plants;" .. fgettext("Waving Plants") .. ";"
-					.. dump(core.settings:get_bool("enable_waving_plants")) .. "]"
+					.. dump(core.settings:get_bool("enable_waving_plants")) .. "]"..
+			"label[8.25,3.0;" .. fgettext("Dynamic shadows: ") .. "]" ..
+			"dropdown[8.25,3.5;3.5;dd_shadows;" .. dd_options.shadow_levels[1] .. ";"
+					.. getSettingIndex.ShadowMapping() .. "]"
 	else
 		tab_string = tab_string ..
 			"label[8.38,0.7;" .. core.colorize("#888888",
@@ -207,7 +231,9 @@ local function formspec(tabview, name, tabdata)
 			"label[8.38,1.7;" .. core.colorize("#888888",
 					fgettext("Waving Leaves")) .. "]" ..
 			"label[8.38,2.2;" .. core.colorize("#888888",
-					fgettext("Waving Plants")) .. "]"
+					fgettext("Waving Plants")) .. "]"..
+			"label[8.38,2.7;" .. core.colorize("#888888",
+					fgettext("Dynamic shadows")) .. "]"
 	end
 
 	return tab_string
@@ -333,6 +359,34 @@ local function handle_settings_buttons(this, fields, tabname, tabdata)
 		ddhandled = true
 	end
 
+	for i = 1, #labels.shadow_levels do
+		if fields["dd_shadows"] == labels.shadow_levels[i] then
+			core.settings:set("shadow_levels", dd_options.shadow_levels[2][i])
+			ddhandled = true
+		end
+	end
+
+	if fields["dd_shadows"] == labels.shadow_levels[1] then
+		core.settings:set("enable_dynamic_shadows", "false")
+	else
+		core.settings:set("enable_dynamic_shadows", "true")
+		local shadow_presets = {
+			[2] = { 80,  512,  "true", 0, "false" },
+			[3] = { 120, 1024, "true", 1, "false" },
+			[4] = { 350, 2048, "true", 1, "false" },
+			[5] = { 350, 2048, "true", 2,  "true" },
+			[6] = { 450, 4096, "true", 2,  "true" },
+		}
+		local s = shadow_presets[table.indexof(labels.shadow_levels, fields["dd_shadows"])]
+		if s then
+			core.settings:set("shadow_map_max_distance", s[1])
+			core.settings:set("shadow_map_texture_size", s[2])
+			core.settings:set("shadow_map_texture_32bit", s[3])
+			core.settings:set("shadow_filters", s[4])
+			core.settings:set("shadow_map_color", s[5])
+		end
+	end
+
 	return ddhandled
 end
 
diff --git a/builtin/settingtypes.txt b/builtin/settingtypes.txt
index d13bac91b..ae421de2c 100644
--- a/builtin/settingtypes.txt
+++ b/builtin/settingtypes.txt
@@ -582,6 +582,58 @@ enable_waving_leaves (Waving leaves) bool false
 #    Requires shaders to be enabled.
 enable_waving_plants (Waving plants) bool false
 
+[***Dynamic shadows]
+
+#    Set to true to enable Shadow Mapping.
+#    Requires shaders to be enabled.
+enable_dynamic_shadows (Dynamic shadows) bool false
+
+#    Set the shadow strength.
+#    Lower value means lighter shadows, higher value means darker shadows.
+shadow_strength (Shadow strength) float 0.2 0.05 1.0
+
+#    Maximum distance to render shadows.
+shadow_map_max_distance (Shadow map max distance in nodes to render shadows) float 120.0 10.0 1000.0
+
+#    Texture size to render the shadow map on.
+#    This must be a power of two.
+#    Bigger numbers create better shadowsbut it is also more expensive.
+shadow_map_texture_size (Shadow map texture size) int 1024 128 8192
+
+#    Sets shadow texture quality to 32 bits.
+#    On false, 16 bits texture will be used.
+#    This can cause much more artifacts in the shadow.
+shadow_map_texture_32bit (Shadow map texture in 32 bits) bool true
+
+#    Enable poisson disk filtering.
+#    On true uses poisson disk to make "soft shadows". Otherwise uses PCF filtering.
+shadow_poisson_filter (Poisson filtering) bool true
+
+#   Define shadow filtering quality
+#   This simulates the soft shadows effect by applying a PCF or poisson disk
+#   but also uses more resources.
+shadow_filters (Shadow filter quality) enum 1 0,1,2
+
+#    Enable colored shadows. 
+#    On true translucent nodes cast colored shadows. This is expensive.
+shadow_map_color (Colored shadows) bool false
+
+
+#    Set the shadow update time.
+#    Lower value means shadows and map updates faster, but it consume more resources.
+#    Minimun value 0.001 seconds max value 0.2 seconds
+shadow_update_time (Map update time) float 0.2 0.001 0.2
+
+#    Set the soft shadow radius size.
+#    Lower values mean sharper shadows bigger values softer.
+#    Minimun value 1.0 and max value 10.0
+shadow_soft_radius (Soft shadow radius) float 1.0 1.0 10.0
+
+#    Set the tilt of Sun/Moon orbit in degrees
+#    Value of 0 means no tilt / vertical orbit.
+#    Minimun value 0.0 and max value 60.0
+shadow_sky_body_orbit_tilt (Sky Body Orbit Tilt) float 0.0 0.0 60.0
+
 [**Advanced]
 
 #    Arm inertia, gives a more realistic movement of