Texture uploading refers to a host (CPU) to device (GPU) transfer. When loading data from files, prefer mapped buffer updates (minimal copy overhead).Ĭonsider multi-buffering to explicitly manage buffer access.Įfficient texture updates Texture uploading cloth simulation vertex positions and texture coordinates, consider splitting into separate buffers. If buffers are updated at different frequencies, e.g.
Buffer orphaning is silent, but can cause out-of-memory errors!īatch buffer updates to reduce the likelihood of orphaning.A newly-allocated buffer tied to the GL handle can then be modified by the application developer independently of the in-flight GPU render.
Orphaning duplicates buffers to ensure in-flight frames can access the original data from the orphaned buffer. A simple solution to this problem is for the driver to synchronize CPU and GPU access by stalling the pipeline until the in-flight GPU tasks complete.Īlternatively, an OpenGL ES driver may orphan buffers to avoid stalling. This can lead to scenarios where an application needs to modify a buffer for frame N whilst an in-flight GPU task for frame N-1 still needs to read the previous buffer data. OpenGL ES API call submission is asynchronous from GPU execution. Efficient buffer updates Buffer orphaning Please see our Game Asset Optimization Recommendations. Test your application on lots of devices. RecommendationsĬheck capabilities and extensions at run-time. It is also important to test your application across a wide range of devices, chipsets and GPU architectures to identify bugs early as possible in your development cycle. Debug carries a cost in an OpenGL ES implementation, so consider GL_KHR_no_error in production code. KHR_debug /Debug Output (OpenGL ES 3.2), glGetError() and graphics API debugging tools are useful for identifying API misuse. Like any performance-focused API, there are situations in OpenGL ES where undefined behavior can occur if the API user doesn't adhere to the specification. When developing high-performance applications, it's essential to understand the capabilities and performance characteristics of the APIs and hardware you are targeting. You can also learn more about GPU architectures here and here.īefore reading this document, we recommend familiarizing yourself with our Game Asset Optimization Recommendations.
If you are new to OpenGL ES, you can get started with our recommended SDKs that introduce the API concepts though code examples. It also assumes the reader is familiar with the fundamentals of Tile Based Rendering (TBR) GPU architectures commonly found in mobile devices. This OpenGL ES usage guide assumes the reader is already familiar with the API, but wants to know how to use it effectively across a wide range of Galaxy devices. OpenGL ES Usage Recommendations Introduction
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