From 09fa1809ab285d41180a5767d8cf408855986129 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Sun, 7 May 2023 22:12:00 -0500
Subject: implement basic third-person camera

---
 main.lua | 87 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 83 insertions(+), 4 deletions(-)

(limited to 'main.lua')

diff --git a/main.lua b/main.lua
index c06b80c..4372a03 100644
--- a/main.lua
+++ b/main.lua
@@ -14,6 +14,7 @@ local nvg = honey.nvg
 
 -- initialize honey
 local window = honey.init()
+window:setInputMode(glfw.CURSOR, glfw.CURSOR_DISABLED)
 
 -- setup vector graphics
 local vg = nvg.CreateContext()
@@ -127,7 +128,7 @@ function setupEntities()
 
 	local capsule = entities:createEntityWithComponents{
 		transform = {
-			matrix = Mat4():identity():translate(Vec3{0,10,0})
+			matrix = Mat4():identity():translate(Vec3{0,10,0}):rotateX(0.5*math.pi)
 		},
 		collision = {
 			class = "capsule",
@@ -142,6 +143,7 @@ function setupEntities()
 				radius = 1,
 				length = 2,
 			},
+			maxAngularSpeed = 0,
 		},
 		renderMesh = {
 			mesh = { filename="assets/capsule.obj", index=1 },
@@ -150,14 +152,85 @@ function setupEntities()
 	}
 
 
+	local pivotPivot = entities:createEntityWithComponents{
+		transform = {
+			parent = capsule,
+			matrix = Mat4():identity():rotateX(-0.5*math.pi),
+		},
+	}
+
+
+	local capcamPivot = entities:createEntityWithComponents{
+		transform = {
+			parent = pivotPivot,
+			matrix = Mat4():identity(),
+		},
+		pitchyaw = {
+			pitch = 0,
+			yaw = 0,
+		},
+		onCursorPos = { script = "cameraCursorPos" },
+	}
+	package.loaded["cameraCursorPos"] = (function()
+		local prevx, prevy = 0, 0
+		return function(entities, id, data)
+			local dx = data.xpos - prevx
+			local dy = data.ypos - prevy
+			prevx, prevy = data.xpos, data.ypos
+
+			local transform = entities:getComponent(id, "transform")
+			local py = entities:getComponent(id, "pitchyaw")
+			py.pitch = py.pitch - dy
+			py.yaw = py.yaw - dx
+			if py.pitch > 89.9 then py.pitch = 89.9 end
+			if py.pitch < -89.9 then py.pitch = -89.9 end
+
+			transform.matrix
+				:identity()
+				:rotateY(math.rad(py.yaw))
+				:rotateX(math.rad(py.pitch))
+		end
+	end)()
+
+
+	local capcam = entities:createEntityWithComponents{
+		camera = {
+			projection = Mat4():perspective(math.rad(45), 640/480, 0.1, 1000),
+			render="screen",
+		},
+		transform = {
+			parent = capcamPivot,
+			matrix = Mat4():identity():translate(Vec3{0,0,10}),
+		},
+		onWindowResize = { script = "cameraHandleResize" },
+	}
+
+
+	local skybox = entities:createEntityWithComponents{
+		transform = {
+			parent = capsule,
+			matrix = Mat4():identity():scale(Vec3{2,2,2}),
+		},
+		renderMesh = {
+			mesh = { filename="assets/skybox.obj", index=1 },
+			shader = { vertex="vertex.glsl", fragment="fragment.glsl" },
+			textures = { 
+				ourTexture = { 
+					filename = "assets/skyboxsun5deg2_tn.jpg" 
+				} 
+			},
+		},
+	}
+
+
 	local camera = entities:createEntity()
 	entities:addComponents(camera, {
-		camera={
-			projection=Mat4():perspective(math.rad(45), 640/480, 0.1, 100),
+		ccamera={
+			projection=Mat4():perspective(math.rad(45), 640/480, 0.1, 1000),
 			render="screen",
 		},
 		transform={
-			matrix=Mat4():identity():rotateX(math.rad(-20)):translate(Vec3{0, 10, 30}),
+			matrix=Mat4():identity():rotateX(math.rad(-20)):translate(Vec3{0, 5, 30}),
 		},
 		z = {value=-60},
 		onKey = {
@@ -184,6 +257,11 @@ window:setKeyCallback(function(_, key, scancode, action)
 	end
 end)
 
+
+window:setCursorPosCallback(function(_, xpos, ypos)
+	dispatch(entities, "onCursorPos", {xpos=xpos, ypos=ypos})
+end)
+
 -- resize window correctly
 window:setFramebufferSizeCallback(function(_, width, height)
 	gl.Viewport(0, 0, width, height)
@@ -193,6 +271,7 @@ end)
 
 package.loaded["cameraHandleResize"] = function(entities, id, data)
 	local camera = entities:getComponent(id, "camera")
+	if not camera then return end
 	camera.projection:perspectiveResize(data.width/data.height)
 end
 
-- 
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