Optimizing Graphics Performance on iOS/Android

-
iOS:

  • 遵守可視的vertex數目限制:
    • 40K - iPhone 3GS以後的新裝置(with SGX GPU)
    • 10K - 較舊款的裝置(with MBX GPU)
  • 如果可能要採用lighing shader，vertex lit會是比較好的選擇
  • 盡可能share material，減少不同material的數目
  • 非會移動的物件，指定為靜態物件會帶來最佳化
  • 使用PVRTC格式或是16bit textures
  • 盡量使用single pass pass的效果
  • 盡可能降低shader floating point的精確度
  • 減少使用複雜的shader指令在pixel shader-pow, sin, cos 
  • 盡量避免使用pixel lighting，頂多一盞(推薦方向光為主)
  • 不要使用動態光源當非必要時 -- 使用lightmap會比較好
  • 在pixel shader貼圖使用越少越好
  • 避免用alpha-testing，用alpha-blending取代
  • 非必要時不要使用fog
  • 盡可能使用Occlusion culling以達到節省draw call次數。 
  • 使用skyboxes來模擬遠方景物。
Android:
  • 如果可能要採用lighing shader，vertex lit會是比較好的選擇
  • 盡可能share material，減少不同material的數目
  • 非會移動的物件，指定為靜態物件會帶來最佳化
  • 使用ETC1 格式或是16bit textures
  • 使用mipmaps
  • 盡量使用single pass pass的效果
  • 盡可能降低shader floating point的精確度
  • 減少使用複雜的shader指令在pixel shader-pow, sin, cos 
  • 盡量避免使用pixel lighting，頂多一盞(推薦方向光為主)
  • 不要使用動態光源當非必要時 -- 使用lightmap會比較好
  • 在pixel shader貼圖使用越少越好
  • 避免用alpha-testing，用alpha-blending取代
  • 非必要時不要使用fog
  • 盡可能使用Occlusion culling以達到節省draw call次數。 
  • 使用skyboxes來模擬遠方景物。
Reference: http://unity3d.com/support/documentation/Manual/Optimizing%20Graphics%20Performance.html

    Comments

    Post a Comment

    Popular posts from this blog

    Drawing textured cube with Vulkan on Android

    -
    Image
    Vulkan is a modern hardware-accelerated Graphics API. Its goal is providing an high efficient way in low-level graphics and compute on modern GPUs for PC, mobile, and embedded devices. I am personally working a self training project, vulkan-android , to teach myself how to use this new APIs. The difference between OpenGL and Vulkan OpenGL: Higher level API in comparison with Vulkan, and the next generation of OpenGL 4 will be Vulkan.   Cross-platform and Cross-language (mostly still based on C/C++, but people implemented diverse versions and expose similar API binding based on OpenGL C++, WebGL is a good example).  Mainly used in 3D graphics and 2D image processing to interact with GPU in order to achieve hardware acceleration. Don't have a command buffer can be manipulated at the application side. That means we will be easily see draw calls being the performance bottleneck in a big and complex 3D scene. Vulkan: Cross-platform and low-overhead. Erase the boundary bet...
    Read more

    glTF loader for Android Vulkan

    -
    Image
    This post is going to introduce how we integrate with an existing glTF loader library to make it be able to show glTF models in our Vulkan rendering framework,  vulkan-android . tinygltf In the beginning, we don't want to make our new own wheel, so choosing  tinygltf as our glTF loader. tinygltf is a C++11 based library that would help us support all possible cross-platform project easily. tinygltf setup in Android Studio In  vulkan-android  project, we put third party libraries into third_party folder. Therefore, we need to include tinygltf from third_party folder in app/CMakeLists.txt as below. set(THIRD_PARTY_DIR ../../third_party) include_directories(${THIRD_PARTY_DIR}/tinygltf) Model loading from tinygltf We are going to load a gltf ASCII or binary format model from the storage. tinygltf provides two APIs , they are LoadBinaryFromFile() and LoadASCIIFromFile() respectively based on the extension name is *.glb or *.gltf. TinyGLTF loader will return a tiny...
    Read more

    C++ unit testing & CI integration in GitHub (I/2)

    -
    Image
    I am working on a side project,  Vulkan-Android , that is based on Java, JNI, C++, and Vulkan for Android platform. It also uses my C++ math library. Therefore, the requirement of my build and unit tests are around C++. First of all, I would make sure the unit tests in local are run properly. C++ unit test on Mac OS On Mac OS, I think the most convenient way to do unit testing for C++ is writing XCT in Xcode. In the beginning, we need to create a test plan in Xcode. It will helps us create a schema, then, in the test navigator, create a new Unit Test Target. Due to XCT was originally designed for Objective-C or Swift, if we wanna test our C++ code, we need a workaround by making the file extension name to be *.mm . And then, write down the unit tests as below: #import <XCTest/XCTest.h> #include "Vector3d.h" using namespace gfx_math; @interface testVector3D : XCTestCase @end @implementation testVector3D - (void)setUp { // Put setup code here. This method is cal...
    Read more