I recently observed that PapyStampy was fillrate limited on some Android Devices (e.g. on Asus Transformer). I therefore decided to implement Texture compression in order to improve the performances.
\nOn Android devices several compressions are available, depending on the devices.<\/p>\n
I early decided to skip ETC texture compression as alpha channels are not supported. I also decided to encapsulate the compressed textures in DDS files. As a matter of fact DDS file format has several advantages:<\/p>\n
<\/p>\n
I used several command-line softwares in order to compress the textures:<\/p>\n
I created the following Python script in order to automate the texture compression in PapyStampy. This script creates DDS files with suffixed filenames telling the compression used (e.g mytexture.png.atitc.dds). When the application tries to load a texture, it looks for a compressed version of the same texture by appending the suffix to the texture filename.<\/p>\n
import os\r\n\r\n# Path where the source textures are located\r\ng_sourceDirectory = os.path.join(os.curdir , \"assets\", \"levelBuilder\", \"textures\")\r\ng_destDirectory = os.path.join(os.curdir , \"test\")\r\n\r\n# List of supported extensions\r\ng_supportedExtensions = [\"png\", \"jpg\"]\r\n\r\ng_ImageMagikPath = \"D:\\\\Dev\\\\tools\\\\ImageMagick-6.8.9-7\\\\convert.exe\"\r\ng_CompressonatorPath = \"TheCompressonator.exe\"\r\ng_PvrTexToolPath = \"C:\\Imagination\\PowerVR\\GraphicsSDK\\PVRTexTool\\CLI\\Windows_x86_32\\PVRTexToolCLI.exe\"\r\n\r\ng_codec_ATIC = \"ATICompressor.dll\"\r\ng_codec_S3TC = \"dxtc.dll\"\r\n\r\ng_fourCC_S3TC = \"DXT3\"\r\ng_fourCC_ATIC = \"ATCA\" # \"ATI2N\"\r\ng_fourCC_PVRTC= \"PVRTC1_4\"\r\n\r\ndef FlipImage(filepathSrc, filepathDst):\r\n cmd = \"%s \\\"%s\\\" -flip -alpha on -channel RGBA PNG32:\\\"%s\\\"\" %(g_ImageMagikPath, filepathSrc, filepathDst)\r\n #print cmd\r\n os.system(cmd)\r\n\r\ndef ConvertWithCompressonator(filepathSrc, filepathDst, fourCC, codec):\r\n cmd = \"%s -convert \\\"%s\\\" \\\"%s\\\" -codec %s +fourCC %s\" %(g_CompressonatorPath, filepathSrc, filepathDst, codec, fourCC)\r\n #print cmd\r\n os.system(cmd)\r\n\r\ndef ConvertWithPvrTexTool(filepathSrc, filepathDst, format): # -flip y\r\n cmd = \"%s -f %s -i \\\"%s\\\" -q pvrtcbest -o \\\"%s\\\"\" %(g_PvrTexToolPath, format, filepathSrc, filepathDst)\r\n #print cmd\r\n os.system(cmd)\r\n\r\ndef ProcessFileS3TC(filepath, filename, extension, flippedImagePath):\r\n # Flip the image\r\n if flippedImagePath == None:\r\n flippedImagePath = os.path.join(g_destDirectory , \"tmp.%s\" %extension)\r\n FlipImage(filepath, flippedImagePath)\r\n # Encode\r\n finalImage = os.path.join(g_destDirectory , \"%s.s3tc.dds\" %filename)\r\n ConvertWithCompressonator(flippedImagePath, finalImage, g_fourCC_S3TC, g_codec_S3TC)\r\n\r\ndef ProcessFileATITC(filepath, filename, extension, flippedImagePath):\r\n # Flip the image\r\n if flippedImagePath == None:\r\n flippedImagePath = os.path.join(g_destDirectory , \"tmp.%s\" %extension)\r\n FlipImage(filepath, flippedImagePath)\r\n # Encode\r\n finalImage = os.path.join(g_destDirectory , \"%s.atitc.dds\" %filename)\r\n ConvertWithCompressonator(flippedImagePath, finalImage, g_fourCC_ATIC, g_codec_ATIC)\r\n\r\ndef ProcessFilePVRTC(filepath, filename, extension):\r\n # Encode\r\n finalImage = os.path.join(g_destDirectory , \"%s.pvrtc.dds\" %filename)\r\n ConvertWithPvrTexTool(filepath, finalImage, g_fourCC_PVRTC)\r\n\r\ndef ProcessFiles(dir, extension):\r\n # Process all the files of the directory\r\n for file in os.listdir(dir):\r\n if file.lower().endswith(\".%s\" %extension):\r\n filepath = os.path.join(dir, file)\r\n # Compute the flipped image as it will be reused\r\n flippedImagePath = os.path.join(g_destDirectory , \"tmp.%s\" %extension)\r\n FlipImage(filepath, flippedImagePath)\r\n # Process for S3TC\r\n ProcessFileS3TC(filepath, file, extension, flippedImagePath)\r\n # Process for ATITC\r\n ProcessFileATITC(filepath, file, extension, flippedImagePath)\r\n # Process PVR\r\n ProcessFilePVRTC(filepath, file, extension)\r\n\r\nProcessFiles(g_sourceDirectory, \"png\")<\/pre>\nThis script was written for my configuration and will need to be updated depending on your OS and depending on the location of your binaries\/source textures\/…<\/p>\n
How to load compressed textures in Android?<\/h2>\n
| <\/td>\n | Transformer<\/td>\n | Xperia L<\/td>\n | OUYA<\/td>\n<\/tr>\n | ||||||
| <\/td>\n | High RGB32<\/td>\n | Medium DTX<\/td>\n | Low RGB 565<\/td>\n | High RGB32<\/td>\n | Medium ATI<\/td>\n | Low RGB 565<\/td>\n | High RGB32<\/td>\n | Medium DTX<\/td>\n | Low RGB 565<\/td>\n<\/tr>\n |
| Framerate<\/td>\n | 20,5<\/td>\n | 29,8<\/td>\n | 34<\/td>\n | 40,5<\/td>\n | 46<\/td>\n | 44<\/td>\n | 34<\/td>\n | 40<\/td>\n | 50<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n These results show that texture compression clearly improve the performances. We can also see that loading textures without compression but in RGB565 gives the best framerates.<\/p>\n Conclusion<\/h2>\nAs a conclusion, Texture compression improves the performances but can have an impact on the texture quality. It is the same with the alternative of using textures in RGB565 format. <\/p>\n","protected":false},"excerpt":{"rendered":" Texture compression ? What for ? I recently observed that PapyStampy was fillrate limited on some Android Devices (e.g. on Asus Transformer). I therefore […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[],"class_list":["post-343","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"acf":{"full_width":false,"header_transparent":false},"aioseo_notices":[],"_links":{"self":[{"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/posts\/343","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/comments?post=343"}],"version-history":[{"count":7,"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/posts\/343\/revisions"}],"predecessor-version":[{"id":351,"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/posts\/343\/revisions\/351"}],"wp:attachment":[{"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/media?parent=343"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/categories?post=343"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.noxis-studio.com\/blog\/wp-json\/wp\/v2\/tags?post=343"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}} |