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anv: Return trampoline entrypoints from GetInstanceProcAddr

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Technically, the Vulkan spec requires that we return valid entrypoints
for all core functionality and any available device extensions.  This
means that, for gen-specific functions, we need to return a trampoline
which looks at the device and calls the right device function.  In 99%
of cases, the loader will do this for us but, aparently, we're supposed
to do it too.  It's a tiny increase in binary size for us to carry this
around but really not bad.

Before:
       text    data   bss      dec     hex  filename
    3541775  204112  6136  3752023  394057  libvulkan_intel.so

After:
       text    data   bss      dec     hex  filename
    3551463  205632  6136  3763231  396c1f  libvulkan_intel.so

Reviewed-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
This commit is contained in:
Jason Ekstrand
2018-01-20 10:39:16 -08:00
parent eac29f3a6d
commit de00e8227b
2 changed files with 50 additions and 1 deletions
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5
src/intel/vulkan/anv_device.c
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@@ -582,8 +582,11 @@ VkResult anv_CreateInstance(
if (!anv_entrypoint_is_enabled(i, instance->apiVersion,
&instance->enabled_extensions, NULL)) {
instance->dispatch.entrypoints[i] = NULL;
} else {
} else if (anv_dispatch_table.entrypoints[i] != NULL) {
instance->dispatch.entrypoints[i] = anv_dispatch_table.entrypoints[i];
} else {
instance->dispatch.entrypoints[i] =
anv_tramp_dispatch_table.entrypoints[i];
}
}