add basic bouncing ball

1 files changed, 97 insertions, 0 deletions

diff --git a/demo/bouncing_ball/mesh.lua b/demo/bouncing_ball/mesh.lua
new file mode 100644
index 0000000..cc957cd
--- /dev/null
+++ b/demo/bouncing_ball/mesh.lua
@@ -0,0 +1,97 @@
+local Mesh = {}
+local gl = honey.gl
+setmetatable(Mesh, {__index=_G})
+setfenv(1, Mesh)
+
+
+--===== creation =====--
+
+local function loadScene(filename)
+	local scene = honey.import.importFile(filename)
+	local mesh = scene.meshes[1]
+	local vertices = {}
+
+	for i=1,#mesh.vertices do
+		local position = mesh.vertices[i]
+		local uv = mesh.uvs[1][i]
+		table.insert(vertices, position.x)
+		table.insert(vertices, position.y)
+		table.insert(vertices, position.z)
+		table.insert(vertices, uv.x)
+		table.insert(vertices, uv.y)
+	end
+
+	local elements = {}
+	for _, face in ipairs(mesh.faces) do
+		assert(#face == 3)
+		for _, i in ipairs(face) do
+			table.insert(elements, i)
+		end
+	end
+
+	return vertices, elements
+end
+
+
+function Load(filename)
+	local self = {}
+	setmetatable(self, {__index=Mesh})
+
+	self.transform = honey.glm.mat4()
+	honey.glm.mat4_identity(self.transform)
+
+	-- opengl mesh data
+	self.vertexArray = gl.GenVertexArrays()
+	self.vertexBuffer = gl.GenBuffers()
+	self.elementBuffer = gl.GenBuffers()
+
+	-- load data
+	local vertices, elements = loadScene(filename)
+	self.elementCount = #elements
+
+	-- buffer data
+	gl.BindVertexArray(self.vertexArray)
+	gl.BindBuffer(gl.ARRAY_BUFFER, self.vertexBuffer)
+	gl.BufferData(gl.ARRAY_BUFFER, gl.FLOAT, vertices, gl.STATIC_DRAW)
+
+	gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, self.elementBuffer)
+	gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, gl.UNSIGNED_INT, elements, gl.STATIC_DRAW)
+
+	-- set vertex attributes
+	-- position
+	gl.VertexAttribPointer(0, 3, false, 5, 0)
+	gl.EnableVertexAttribArray(0)
+	-- uvs
+	gl.VertexAttribPointer(1, 2, false, 5, 3)
+	gl.EnableVertexAttribArray(1)
+
+	return self
+end
+
+
+--===== methods =====--
+
+local function vectorToTable(v)
+	local tbl = {
+		x = honey.glm.vec3_get(v, 0),
+		y = honey.glm.vec3_get(v, 1),
+		z = honey.glm.vec3_get(v, 2),
+	}
+	return tbl
+end
+
+function SetPosition(self, position)
+	honey.glm.mat4_identity(self.transform)
+	honey.glm.translate(self.transform, position)
+end
+
+
+function Draw(self)
+	gl.BindVertexArray(self.vertexArray)
+	gl.DrawElements(gl.TRIANGLES, self.elementCount, gl.UNSIGNED_INT, 0)
+end
+
+
+--===== fin =====--
+
+return Mesh