Module makepad_widgets::shader::std::os::linux::dma_buf

Linux cross-process DMA-BUF-based image (“texture”) sharing

An Image<FD> primarily contains DMA-BUF (FD-typed) file descriptor(s) (within each ImagePlane<FD>, which also tracks its buffer’s “2D slice”), and the “DRM format” (DrmFormat) describing the image’s texel encoding, all combined into a conveniently (de)serializable form (as long as FD is).

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Under EGL, this allows sharing an OpenGL texture across processes, e.g.:

• A creates an EGLImage from some OpenGL texture (or another resource)
• A exports its EGLImage using EGL_MESA_image_dma_buf_export
• A passes to B its DMA-BUF file descriptor(s) and “DRM format” metadata
• B imports it as an EGLImage using EGL_EXT_image_dma_buf_import
• B exposes its EGLImage as an OpenGL texture using glEGLImageTargetTexture2DOES

Structs

• DrmFormat
  In the Linux DRM+KMS system (i.e. kernel-side GPU drivers), a “DRM format” is an image format (i.e. a specific byte-level encoding of texel data) that framebuffers (or more generally “surfaces” / “images”) could use, provided that all the GPUs involved support the specific format used.
• Image
• ImagePlane
• RemoteFd