Test shaders

druid/druid.script

@@ -0,0 +1,37 @@
+-- Place this script nearby with the gui component to able make requests
+-- To the go namespace from GUI with events systems (cross context)
+
+local event_queue = require("druid.event_queue")
+
+---Usage: event_queue.request("druid.get_atlas_path", callback, gui.get_texture(self.node), msg.url())
+---Pass texture name to get atlas info and sender url to check if the request is valid
+local MESSAGE_GET_ATLAS_PATH = "druid.get_atlas_path"
+
+
+---@param texture_name hash The name from gui.get_texture(node)
+---@param sender hash Just msg.url from the caller
+local function get_atlas_path(texture_name, sender)
+	local my_url = msg.url()
+	my_url.fragment = nil
+
+	local copy_url = msg.url(sender)
+	copy_url.fragment = nil
+
+	-- This check should works well
+	local is_my_url = my_url == copy_url
+	if not is_my_url then
+		return nil
+	end
+
+	return go.get(sender, "textures", { key = texture_name })
+end
+
+
+function init(self)
+	event_queue.subscribe(MESSAGE_GET_ATLAS_PATH, get_atlas_path)
+end
+
+
+function final(self)
+	event_queue.unsubscribe(MESSAGE_GET_ATLAS_PATH, get_atlas_path)
+end

druid/event_queue.lua

@@ -0,0 +1,84 @@
+local event = require("event.event")
+
+---@class event.queue
+local M = {}
+
+local event_handlers = {}
+local pending_callbacks = {}
+
+
+---Request to handle a specified event and processes the queue of callbacks associated with it.
+---If event has already been triggered, the callback will be executed immediately.
+---If event not triggered yet, callback will be executed when event will be triggered.
+---It triggered only once and then removed from the queue.
+---@param event_name string The name of the event to trigger.
+---@param callback fun() The callback function to execute upon triggering.
+---@param ... any Additional arguments for the callback.
+function M.request(event_name, callback, ...)
+	pending_callbacks[event_name] = pending_callbacks[event_name] or {}
+	table.insert(pending_callbacks[event_name], { event.create(callback), ... })
+
+	M.process_pending_callbacks(event_name)
+end
+
+
+---Subscribes to a specified event and executes a callback when the event is triggered.
+-- If the event has already been triggered, the callback will be executed immediately.
+---@param event_name string The name of the event to subscribe to.
+---@param callback fun() The function to call when the event is triggered.
+function M.subscribe(event_name, callback)
+	event_handlers[event_name] = event_handlers[event_name] or event.create()
+
+	if event_handlers[event_name] then
+		event_handlers[event_name]:subscribe(callback)
+	end
+
+	M.process_pending_callbacks(event_name)
+end
+
+
+---Unsubscribes a callback function from a specified event.
+---@param event_name string The name of the event to unsubscribe from.
+---@param callback fun() The function to remove from the event's subscription list.
+function M.unsubscribe(event_name, callback)
+	if event_handlers[event_name] then
+		event_handlers[event_name]:unsubscribe(callback)
+	end
+end
+
+
+---Processes the queue for a given event name, executing callbacks and handling results.
+---Processed callbacks are removed from the queue.
+---@param event_name string The name of the event for which to process the queue.
+function M.process_pending_callbacks(event_name)
+	local callbacks_to_process = pending_callbacks[event_name]
+	local event_handler = event_handlers[event_name]
+
+	if not callbacks_to_process or not event_handler then
+		return
+	end
+
+	-- Loop through the queue in reverse to prevent index errors during removal
+	for i = #callbacks_to_process, 1, -1 do
+		local callback_entry = callbacks_to_process[i]
+		-- Better to figure out how to make it without 2 unpacks, but ok for all our cases now
+		local args = { unpack(callback_entry, 2) }
+
+		-- Safely call the event handler and handle errors
+		local success, result = pcall(event_handler.trigger, event_handler, unpack(args))
+
+		if success and result then
+			local callback_function = callback_entry[1]
+			pcall(callback_function, result) -- Safely invoke the callback, catching any errors
+			table.remove(callbacks_to_process, i) -- Remove the processed callback from the queue
+		end
+	end
+
+	-- Clean up if the callback queue is empty
+	if #callbacks_to_process == 0 then
+		pending_callbacks[event_name] = nil
+	end
+end
+
+
+return M

druid/helper.lua

@@ -12,6 +12,11 @@ local POSITION_X = hash("position.x")
 local SCALE_X = hash("scale.x")
 local SIZE_X = hash("size.x")
 
+M.PROP_SIZE_X = hash("size.x")
+M.PROP_SIZE_Y = hash("size.y")
+M.PROP_SCALE_X = hash("scale.x")
+M.PROP_SCALE_Y = hash("scale.y")
+
 local function get_text_width(text_node)
 	if text_node then
 		local text_metrics = M.get_text_metrics_from_node(text_node)
@@ -540,4 +545,121 @@ function M.get_full_position(node, root)
 end
 
 
+---@class druid.animation_data
+---@field frames table<number, table<string, number>> @List of frames with uv coordinates and size
+---@field width number @Width of the animation
+---@field height number @Height of the animation
+---@field fps number @Frames per second
+---@field current_frame number @Current frame
+---@field node node @Node with flipbook animation
+---@field v vector4 @Vector with UV coordinates and size
+
+---@param node node
+---@param atlas_path string @Path to the atlas
+---@return druid.animation_data
+function M.get_animation_data_from_node(node, atlas_path)
+	local atlas_data = resource.get_atlas(atlas_path)
+	local tex_info = resource.get_texture_info(atlas_data.texture)
+	local tex_w = tex_info.width
+	local tex_h = tex_info.height
+
+	local animation_data
+
+	local sprite_image_id = gui.get_flipbook(node)
+	for _, animation in ipairs(atlas_data.animations) do
+		if hash(animation.id) == sprite_image_id then
+			animation_data = animation
+			break
+		end
+	end
+	assert(animation_data, "Unable to find image " .. sprite_image_id)
+
+	local frames = {}
+	for index = animation_data.frame_start, animation_data.frame_end - 1 do
+		local uvs = atlas_data.geometries[index].uvs
+		assert(#uvs == 8, "Sprite trim mode should be disabled for the images.")
+
+		--   UV texture coordinates
+		--   1
+		--   ^ V
+		--   |
+		--   |
+		--   |       U
+		--   0-------> 1
+
+		-- uvs = {
+		-- 0,     0,
+		-- 0,     height,
+		-- width, height,
+		-- width, 0
+		-- },
+		-- Point indeces (Point number {uv_index_x, uv_index_y})
+		-- geometries.indices = {0 (1,2),  1(3,4),  2(5,6),  0(1,2),  2(5,6),  3(7,8)}
+		--   1------2
+		--   |    / |
+		--   | A /  |
+		--   |  / B |
+		--   | /    |
+		--   0------3
+
+		local width = uvs[5] - uvs[1] -- Width of sprite region
+		local height = uvs[2] - uvs[4] -- Height of sprite region
+		local is_rotated = height < 0 -- In case of rotated sprite
+
+		local x_left = uvs[1]
+		local y_bottom = uvs[2]
+		local x_right = uvs[5]
+		local y_top = uvs[6]
+
+		-- Okay now it's correct for non rotated
+		local uv_coord = vmath.vector4(
+			x_left / tex_w,
+			(tex_h - y_bottom) / tex_h,
+			x_right / tex_w,
+			(tex_h - y_top) / tex_h
+		)
+
+		if is_rotated then
+			-- In case the atlas has clockwise rotated sprite.
+			--   0---------------1
+			--   | \        A    |
+			--   |     \         |
+			--   |         \     |
+			--   | B           \ |
+			--   3---------------2
+			height = -height
+
+			uv_coord.x, uv_coord.y, uv_coord.z, uv_coord.w = uv_coord.y, uv_coord.z, uv_coord.w, uv_coord.x
+
+			-- Update uv_coord
+			--uv_coord = vmath.vector4(
+			--	u1 / tex_w,
+			--	(tex_h - v2) / tex_h,
+			--	u2 / tex_w,
+			--	(tex_h - v1) / tex_h
+			--)
+		end
+
+		local frame = {
+			uv_coord = uv_coord,
+			w = width,
+			h = height,
+			uv_rotated = is_rotated and vmath.vector4(0, 1, 0, 0) or vmath.vector4(1, 0, 0, 0)
+		}
+
+		table.insert(frames, frame)
+	end
+
+	return {
+		frames 	= frames,
+		width   = animation_data.width,
+		height 	= animation_data.height,
+		fps     = animation_data.fps,
+		v       = vmath.vector4(1, 1, animation_data.width, animation_data.height),
+		current_frame = 1,
+		node    = node,
+	}
+end
+
+
 return M

druid/materials/gui_repeat/gui_repeat.fp

@@ -0,0 +1,84 @@
+#version 140
+
+uniform sampler2D texture_sampler;
+
+in vec2 var_texcoord0;
+in vec4 var_color;
+in vec4 var_uv;
+in vec4 var_repeat; // [repeat_x, repeat_y, anchor_x, anchor_y]
+in vec4 var_params; // [margin_x, margin_y, offset_x, offset_y]
+in vec4 var_perspective;
+in vec4 var_uv_rotated;
+
+out vec4 color_out;
+
+void main() {
+	vec2 pivot = var_repeat.zw;
+	// Margin is a value between 0 and 1 that means offset/padding from the one image to another
+	vec2 margin = var_params.xy;
+	vec2 offset = var_params.zw;
+	vec2 repeat = var_repeat.xy;
+
+	// Atlas UV to local UV [0, 1]
+	float u = (var_texcoord0.x - var_uv.x) / (var_uv.z - var_uv.x);
+	float v = (var_texcoord0.y - var_uv.y) / (var_uv.w - var_uv.y);
+
+	// Adjust local UV by the pivot point. So 0:0 will be at the pivot point of node
+	u = u - (0.5 + pivot.x);
+	v = v - (0.5 - pivot.y);
+
+	// If rotated, swap UV
+	if (var_uv_rotated.y < 0.5) {
+		float temp = u;
+		u = v;
+		v = temp;
+	}
+
+	// Adjust repeat by the margin
+	repeat.x = repeat.x / (1.0 + margin.x);
+	repeat.y = repeat.y / (1.0 + margin.y);
+
+	// Repeat is a value between 0 and 1 that represents the number of times the texture is repeated in the atlas.
+	float tile_u = fract(u * repeat.x);
+	float tile_v = fract(v * repeat.y);
+
+	float tile_width = 1.0 / repeat.x;
+	float tile_height = 1.0 / repeat.y;
+
+	// Adjust tile UV by the pivot point.
+	// Not center is left top corner, need to adjust it to pivot point
+	tile_u = fract(tile_u + pivot.x + 0.5);
+	tile_v = fract(tile_v - pivot.y + 0.5);
+
+	// Apply offset
+	tile_u = fract(tile_u + offset.x);
+	tile_v = fract(tile_v + offset.y);
+
+	// Extend margins
+	margin = margin * 0.5;
+	tile_u = mix(0.0 - margin.x, 1.0 + margin.x, tile_u);
+	tile_v = mix(0.0 - margin.y, 1.0 + margin.y, tile_v);
+	float alpha = 0.0;
+	// If the tile is outside the margins, make it transparent, without IF
+	alpha = step(0.0, tile_u) * step(tile_u, 1.0) * step(0.0, tile_v) * step(tile_v, 1.0);
+
+	tile_u = clamp(tile_u, 0.0, 1.0); // Keep borders in the range 0-1
+	tile_v = clamp(tile_v, 0.0, 1.0); // Keep borders in the range 0-1
+
+	if (var_uv_rotated.y < 0.5) {
+		float temp = tile_u;
+		tile_u = tile_v;
+		tile_v = temp;
+	}
+
+	// Remap local UV to the atlas UV
+	vec2 uv = vec2(
+		mix(var_uv.x, var_uv.z, tile_u), // Get texture coordinate from the atlas
+		mix(var_uv.y, var_uv.w, tile_v) // Get texture coordinate from the atlas
+		//mix(var_uv.x, var_uv.z, tile_u * var_uv_rotated.x + tile_v * var_uv_rotated.z),
+		//mix(var_uv.y, var_uv.w, 1.0 - (tile_u * var_uv_rotated.y + tile_v * var_uv_rotated.x))
+	);
+
+	lowp vec4 tex = texture(texture_sampler, uv);
+	color_out = tex * var_color;
+}

druid/materials/gui_repeat/gui_repeat.material

@@ -0,0 +1,43 @@
+name: "repeat"
+tags: "gui"
+vertex_program: "/druid/materials/gui_repeat/gui_repeat.vp"
+fragment_program: "/druid/materials/gui_repeat/gui_repeat.fp"
+vertex_constants {
+  name: "view_proj"
+  type: CONSTANT_TYPE_VIEWPROJ
+}
+vertex_constants {
+  name: "uv_coord"
+  type: CONSTANT_TYPE_USER
+  value {
+    z: 1.0
+    w: 1.0
+  }
+}
+vertex_constants {
+  name: "uv_repeat"
+  type: CONSTANT_TYPE_USER
+  value {
+    x: 1.0
+    y: 1.0
+  }
+}
+vertex_constants {
+  name: "params"
+  type: CONSTANT_TYPE_USER
+  value {
+  }
+}
+vertex_constants {
+  name: "perspective"
+  type: CONSTANT_TYPE_USER
+  value {
+  }
+}
+vertex_constants {
+  name: "uv_rotated"
+  type: CONSTANT_TYPE_USER
+  value {
+    x: 1.0
+  }
+}