From 6332f2f5cf06b8a58ab8ae9844649e73131eccc5 Mon Sep 17 00:00:00 2001
From: James Lambert <lambertjamesd@gmail.com>
Date: Thu, 22 Dec 2022 10:54:42 -0700
Subject: [PATCH] Start work on trigger

---
 tools/level_scripts/trigger.lua | 159 ++++++++++++++++++++++++++++++++
 1 file changed, 159 insertions(+)
 create mode 100644 tools/level_scripts/trigger.lua

diff --git a/tools/level_scripts/trigger.lua b/tools/level_scripts/trigger.lua
new file mode 100644
index 0000000..95f98d7
--- /dev/null
+++ b/tools/level_scripts/trigger.lua
@@ -0,0 +1,159 @@
+
+local sk_definition_writer = require('sk_definition_writer')
+local sk_scene = require('sk_scene')
+
+sk_definition_writer.add_header('"../build/src/audio/clips.h"')
+
+
+local function does_belong_to_cutscene(first_step, step)
+    local offset = step.position - first_step.position
+    local local_pos = first_step.rotation * offset
+
+    return local_pos.y >= 0 and local_pos.x * local_pos.x + local_pos.z * local_pos.z < 0.1
+end
+
+local function distance_from_start(first_step, step)
+    local offset = step.position - first_step.position
+    local local_pos = first_step.rotation * offset
+    return local_pos.y
+end
+
+local function cutscene_index(cutscenes, name)
+    for index, cutscene in pairs(cutscenes) do
+        if cutscene.name == name then
+            return index - 1
+        end
+    end
+
+    return -1
+end
+
+local function find_label_locations(steps)
+    local result = {}
+    local current_index = 1
+    
+    while current_index <= #steps do
+        local step = steps[current_index]
+
+        if step.command == "label" and #step.args >= 1 then
+            result[step.args[1]] = current_index
+            table.remove(steps, current_index)
+        else
+            current_index = current_index + 1
+        end
+    end
+
+    return result
+end
+
+local function generate_cutscene_step(step)
+    local result = {}
+
+    if step.command == "play_sound" or step.command == "start_sound" and #step.args >= 1 then
+        result.type = step.command == "play_sound" and 
+            sk_definition_writer.raw('CutsceneStepTypePlaySound') or 
+            sk_definition_writer.raw('CutsceneStepTypeStartSound')
+    else
+        result.type = sk_definition_writer.raw('CutsceneStepTypeNoop')
+        table.noop = 0;
+    end
+
+    return result
+end
+
+local function generate_cutscenes()
+    local step_nodes = sk_scene.nodes_for_type("@cutscene")
+
+    local steps = {}
+    local cutscenes = {}
+
+    for _, node_info in pairs(step_nodes) do
+        if #node_info.arguments > 0 then
+            local command = node_info.arguments[1]
+            local args = {table.unpack(node_info.arguments, 2)}
+
+            local scale, rotation, position = node_info.node.transformation:decompose()
+
+            local step = {
+                command = command,
+                args = args,
+                position = position,
+                rotation = rotation:conjugate(),
+            }
+
+            if command == "start" and #args > 1 then
+                table.insert(cutscenes, {
+                    name = args[1],
+                    steps = {step},
+                })
+            else
+                table.insert(steps, step)
+            end
+        end
+    end
+
+    for _, cutscene in pairs(cutscenes) do
+        for _, step in pairs(steps) do
+            if does_belong_to_cutscene(cutscene.steps[1], step) then
+                table.insert(cutscene.steps, step)
+            end
+        end
+    end
+
+    local cutscenes_result = {}
+
+    for _, cutscene in pairs(cutscenes) do
+        local first_step = cutscene.steps[1]
+        local other_steps = {table.unpack(cutscene.steps, 2)}
+
+        table.sort(other_steps, function(a, b)
+            return distance_from_start(first_step, a) < distance_from_start(first_step, b)
+        end)
+
+        local label_locations = find_label_locations(other_steps)
+
+        local steps = {}
+
+        for step_index, step in pairs(other_steps) do
+            table.insert(steps, generate_cutscene_step())
+        end
+
+        sk_definition_writer.add_definition(cutscene.name .. '_steps', 'struct CutsceneStep[]', '_geo', steps)
+
+        table.insert(cutscenes_result, {
+            name = cutscene.name,
+            steps = steps,
+        })
+    end
+
+    return cutscenes_result
+end
+
+local function generate_triggers(cutscenes)
+    local result = {}
+    
+    for _, trigger in pairs(sk_scene.nodes_for_type('@trigger')) do
+        local first_mesh = trigger.node.meshes[1]
+        local cutscene_index = cutscene_index(cutscenes, trigger.arugments[1])
+    
+        if first_mesh and cutscene_index ~= -1 then
+            local transformed = first_mesh:transform(trigger.node.full_transformation)
+    
+            table.insert(result, {
+                transformed.bb,
+                cutscene_index,
+            })
+        end
+    end
+
+    return result
+end
+
+local cutscenes = generate_cutscenes()
+local triggers = generate_triggers(cutscenes)
+
+sk_definition_writer.add_definition("triggers", "struct Trigger[]", "_geo", triggers)
+
+return {
+    triggers = triggers,
+}
\ No newline at end of file