LoadBufferFormatted, SetBufferData and CopyBufferData. Compressed resource file example.

1 files changed, 94 insertions, 0 deletions

diff --git a/examples/compressed_resource_file/main.lua b/examples/compressed_resource_file/main.lua
new file mode 100644
index 0000000..0f9f904
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+++ b/examples/compressed_resource_file/main.lua
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+-- Simple example to store compressed image to file. 
+-- To store multiple assets, some sort of addressing would be required.
+
+package.path = package.path..";"..RL.GetBasePath().."../resources/lib/?.lua"
+
+Vector2 = require( "vector2" )
+
+local texture = nil
+local dataFileName = "data"
+local compress = true
+-- local compress = false
+
+local function writeDataFile( path )
+	local image = RL.LoadImage( RL.GetBasePath().."../resources/images/arcade_platformerV2.png" )
+
+	if not image then
+		return
+	end
+
+	local imgData = {
+		size = Vector2:newT( RL.GetImageSize( image ) ),
+		mipmaps = RL.GetImageMipmaps( image ),
+		format = RL.GetImageFormat( image ),
+		data = RL.GetImageData( image ),
+	}
+	-- Header and image data. We devide imgData.data by 4 since we use unsigned ints as buffer type.
+	local totalLength = 4 + RL.GetBufferLength( imgData.data ) / 4
+	local buffer = RL.LoadBufferFormatted( totalLength, RL.BUFFER_UNSIGNED_INT, 0 )
+
+	RL.SetBufferData( buffer, 0, imgData.size.x )
+	RL.SetBufferData( buffer, 1, imgData.size.y )
+	RL.SetBufferData( buffer, 2, imgData.mipmaps )
+	RL.SetBufferData( buffer, 3, imgData.format )
+	RL.CopyBufferData( buffer, imgData.data, 4, 0, RL.GetBufferLength( imgData.data ) )
+
+	if compress then
+		RL.ExportBuffer( RL.CompressData( buffer ), path )
+	else
+		RL.ExportBuffer( buffer, path )
+	end
+end
+
+local function loadDataFile( path )
+	local buffer = RL.LoadBufferFromFile( path, RL.BUFFER_UNSIGNED_INT )
+
+	if not buffer then
+		return
+	end
+	
+	if compress then
+		buffer = RL.DecompressData( buffer )
+	end
+
+	local imgData = {
+		size = Vector2:newT( RL.GetBufferData( buffer, 0, 2 ) ),
+		mipmaps = RL.GetBufferData( buffer, 2, 1 )[1],
+		format = RL.GetBufferData( buffer, 3, 1 )[1],
+		data = nil,
+	}
+	local imageDataSize = RL.GetPixelDataSize( imgData.size, imgData.format )
+
+	imgData.data = RL.LoadBufferFormatted( imageDataSize, RL.BUFFER_UNSIGNED_CHAR, 0 )
+
+	RL.CopyBufferData( imgData.data, buffer, 0, 4, imageDataSize / 4 )
+
+	local image = RL.LoadImageFromData(
+		imgData.data,
+		imgData.size,
+		imgData.mipmaps,
+		imgData.format
+	)
+	texture = RL.LoadTextureFromImage( image )
+end
+
+function RL.init()
+	RL.SetWindowTitle( "Compressed resource file" )
+	RL.SetWindowState( RL.FLAG_VSYNC_HINT )
+
+	local path = RL.GetBasePath()..dataFileName
+
+	writeDataFile( path )
+	loadDataFile( path )
+end
+
+function RL.update( delta )
+end
+
+function RL.draw()
+	RL.ClearBackground( RL.RAYWHITE )
+
+	if texture then
+		RL.DrawTextureEx( texture, { 0, 0 }, 0, 2, RL.WHITE )
+	end
+end