From 94fbc0a7d62c5b48eeb056419bc841d4db8f91b4 Mon Sep 17 00:00:00 2001
From: sanine <sanine.not@pm.me>
Date: Mon, 3 Oct 2022 14:20:47 -0500
Subject: add basic bouncing ball

---
 demo/bouncing_ball/shader.lua | 65 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)
 create mode 100644 demo/bouncing_ball/shader.lua

(limited to 'demo/bouncing_ball/shader.lua')

diff --git a/demo/bouncing_ball/shader.lua b/demo/bouncing_ball/shader.lua
new file mode 100644
index 0000000..50d27ff
--- /dev/null
+++ b/demo/bouncing_ball/shader.lua
@@ -0,0 +1,65 @@
+local Shader = {}
+local gl = honey.gl
+setmetatable(Shader, {__index=_G})
+setfenv(1, Shader)
+
+
+--===== creation =====--
+
+function Create(vertexSource, fragmentSource)
+	local self = {}
+	setmetatable(self, {__index=Shader})
+
+	-- vertex shader
+	local vertexShader = gl.CreateShader(gl.VERTEX_SHADER)
+	gl.ShaderSource(vertexShader, vertexSource)
+	gl.CompileShader(vertexShader)
+	
+	-- fragment shader
+	local fragmentShader = gl.CreateShader(gl.FRAGMENT_SHADER)
+	gl.ShaderSource(fragmentShader, fragmentSource)
+	gl.CompileShader(fragmentShader)
+	
+	-- link
+	self.program = gl.CreateProgram()
+	gl.AttachShader(self.program, vertexShader)
+	gl.AttachShader(self.program, fragmentShader)
+	gl.LinkProgram(self.program)
+
+	-- clean up
+	gl.DeleteShader(vertexShader)
+	gl.DeleteShader(fragmentShader)
+
+	return self
+end
+
+
+function Load(vertexFile, fragmentFile)
+	local vf = io.open(vertexFile)
+	local vsource = vf:read('*a')
+	vf:close()
+
+	local ff = io.open(fragmentFile)
+	local fsource = ff:read('*a')
+	ff:close()
+
+	return Create(vsource, fsource)
+end
+
+
+--===== methods =====--
+
+function Use(self)
+	gl.UseProgram(self.program)
+end
+
+function SetMatrix(self, name, matrix)
+	gl.UseProgram(self.program)
+	local location = gl.GetUniformLocation(self.program, name)
+	gl.UniformMatrix4fv(location, false, matrix)
+end
+
+
+--===== fin =====--
+
+return Shader
-- 
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