From 6d96b0e7ea1d98e44647d0bbbba232701a7d557e Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Tue, 4 Oct 2022 14:53:08 -0500
Subject: add first person demo

---
 demo/first_person/camera.lua | 80 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)
 create mode 100644 demo/first_person/camera.lua

(limited to 'demo/first_person/camera.lua')

diff --git a/demo/first_person/camera.lua b/demo/first_person/camera.lua
new file mode 100644
index 0000000..6898d24
--- /dev/null
+++ b/demo/first_person/camera.lua
@@ -0,0 +1,80 @@
+local Camera = {}
+local G = _G
+local honey = honey
+local math = math
+local glm = honey.glm
+setmetatable(Camera, {__index=_G})
+setfenv(1, Camera)
+
+local X = glm.makeVector(1, 0, 0)
+local Y = glm.makeVector(0, 1, 0)
+local Z = glm.makeVector(0, 0, 1)
+
+
+--===== constructor =====--
+
+function constructor(_, fov, ratio, near, far)
+	local self = {}
+	G.setmetatable(self, {__index=Camera})
+
+	self.projection = glm.mat4()
+	self.fov = fov
+	self.near = near
+	self.far = far
+	glm.perspective(fov, ratio, near, far, self.projection)
+
+	self.position = glm.vec3()
+	self.forward = glm.vec3()
+	self.up = Y
+	self.right = glm.vec3()
+
+	self.view = glm.mat4()
+	glm.mat4_identity(self.view)
+
+	return self
+end
+setmetatable(Camera, {__call=constructor})
+
+
+--===== methods =====--
+
+function translate(self, translation)
+	local v = glm.vec3()
+	glm.vec3_scale(self.forward, glm.vec3_get(translation, 0), v)
+	glm.vec3_add(self.position, v, self.position)
+
+	glm.vec3_scale(self.right, glm.vec3_get(translation, 2), v)
+	glm.vec3_add(self.position, v, self.position)
+end
+
+
+function setAngles(self, yaw, pitch)
+	local yawr = math.rad(yaw)
+	local pitchr = math.rad(pitch)
+
+	local x = math.cos(yawr) * math.cos(pitchr)
+	local y = math.sin(pitchr)
+	local z = math.sin(yawr) * math.cos(pitchr)
+
+	glm.setVector(self.forward, x, y, z)
+	glm.vec3_cross(self.forward, self.up, self.right)
+	glm.vec3_normalize(self.forward)
+	glm.vec3_normalize(self.right)
+
+	G.print(yaw, pitch, glm.vec3_tostring(self.forward), glm.vec3_tostring(self.right))
+end
+
+
+function updateView(self)
+	glm.look(self.position, self.forward, self.up, self.view)
+end
+
+
+function updateRatio(self, ratio)
+	glm.perspective(self.fov, ratio, self.near, self.far, self.projection)
+end
+
+
+--===== fin =====--
+
+return Camera
-- 
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