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Platform/GFX/Gralloc: Difference between revisions
→Drawing from Gralloc buffers (binding to GL textures)
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It is worth noting that there are two levels of locking involved here. | It is worth noting that there are two levels of locking involved here. | ||
As GrallocTextureHostOGL::Lock is called, it calls fEGLImageTargetTexture2D (as explained above) which immediately | As GrallocTextureHostOGL::Lock is called, it calls fEGLImageTargetTexture2D (as explained above) which immediately results in placing a read lock on the gralloc buffer. When a subsequent GL drawing operation occurs, sampling from that texture, that will then also place a read lock on the gralloc buffer, this time from the GL kernel driver. | ||
It is vital that these two read locks get released as soon as possible, as we won't be able to draw again into the gralloc buffer (which requires a write lock) until then. | It is vital that these two read locks get released as soon as possible, as we won't be able to draw again into the gralloc buffer (which requires a write lock) until then. | ||