add image caching

1 files changed, 50 insertions, 0 deletions

diff --git a/honey/image.lua b/honey/image.lua
new file mode 100644
index 0000000..f074272
--- /dev/null
+++ b/honey/image.lua
@@ -0,0 +1,50 @@
+local gl = honey.gl
+
+local module = {}
+setmetatable(module, {__index=_G})
+setfenv(1, module)
+
+function Image(filename, params)
+	local params = params or {}
+	local data, width, height = honey.image.load(filename, 4)
+	local self = {}
+	self.width = width
+	self.height = height
+
+	self.texture = gl.GenTextures()
+	gl.BindTexture(gl.TEXTURE_2D, self.texture)
+	for param, value in pairs(params) do
+		gl.TexParameteri(gl.TEXTURE_2D, gl[param], value)
+	end
+	gl.TexImage2D(
+		gl.TEXTURE_2D, 0,
+		gl.RGBA, width, height,
+		gl.RGBA, gl.UNSIGNED_BYTE, data
+	)
+	gl.GenerateMipmap(gl.TEXTURE_2D)
+	honey.image.destroy(data)
+
+	self.__gc = honey.util.gc_canary(function()
+		gl.DeleteTextures(self.texture)
+	end)
+
+	return self
+end
+
+
+local cache = {}
+function loadImage(filename, params)
+	if not cache[filename] then
+		local img = Image(filename, params)
+		cache[filename] = img
+		return img
+	end
+
+	return cache[filename]
+end
+
+function clearImageCache()
+	cache = {}
+end
+
+return module