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0fcddd4d2c
Valhall introduces hardware-allocated varyings. Instead of allocating varying descriptors on the CPU with a slot based interface, the driver just tells the hardware how many bytes to allocate per vertex and loads/stores with byte offsets. This is much nicer! However, this requires us to rework our linking code to account for separable shaders. With separable shaders, we can't rely on driver_location matching between stages, and unlike on Midgard, we can't resolve the differences with curated command stream descriptors. However, we *can* rely on slots matching. So we should "just" determine the byte offsets based on the slot, and then separable shaders work. For GLES, it really is that easy. For desktop GL, it's not -- desktop GL brings unpredictable extra varyings like COL1 and TEX2. Allocating space for all of these unconditionally would hamper performance. To cope, we key fragment shaders to the set of non-GLES varyings written by the linked vertex shader. Then we may define an efficient ABI, where only apps only pay for what they use. Fixes various tests in dEQP-GLES31.functional.separate_shader.random.* on Valhall. Signed-off-by: Alyssa Rosenzweig <alyssa@collabora.com> Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16310> |
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