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Add runtime platform selection

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This adds compile-time support for multiple platforms and runtime
detection of them.  Window system related platform functions are now
called from shared code via the function pointer struct _GLFWplatform.

The timer, thread and module loading platform functions are still called
directly by name and the implementation chosen at link-time.  These
functions are the same for any backend on a given OS, including the Null
backend.

The platforms are now enabled via CMake dependent options following the
GLFW_BUILD_<platform> pattern instead of a mix of automagic and ad-hoc
option names.  There is no longer any option for the Null backend as it
is now always enabled.

Much of the struct stitching work in platform.h was based on an earlier
experimental branch for runtime platform selection by @ronchaine.

Every platform function related to windows, contexts, monitors, input,
event processing and Vulkan have been renamed so that multiple sets of
them can exist without colliding.  Calls to these are now routed through
the _glfw.platform struct member.  These changes makes up most of this
commit.

For Wayland and X11 the client library loading and display creation is
used to detect a running compositor/server.  The XDG_SESSION_TYPE
environment variable is ignored for now, as X11 is still by far the more
complete implementation.

Closes #1655
Closes #1958
This commit is contained in:
Camilla Löwy
2021-07-13 21:50:09 +02:00
parent ff9d9515f6
commit 56a4cb0a3a
56 changed files with 2698 additions and 1235 deletions
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docs/internal.dox
+14 -5
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@@ -61,12 +61,21 @@ application-provided callbacks. It is also prohibited from modifying the
platform-independent part of the internal structs. Instead, it calls the event
interface when events interesting to GLFW are received.
The platform interface mirrors those parts of the public interface that needs to
perform platform-specific operations on some or all platforms. The are also
named the same except that the glfw function prefix is replaced by
_glfwPlatform.
The platform interface mostly mirrors those parts of the public interface that needs to
perform platform-specific operations on some or all platforms.
Examples: `_glfwPlatformCreateWindow`
The window system bits of the platform API is called through the `_GLFWplatform` struct of
function pointers, to allow runtime selection of platform. This includes the window and
context creation, input and event processing, monitor and Vulkan surface creation parts of
GLFW. This is located in the global `_glfw` struct.
Examples: `_glfw.platform.createWindow`
The timer, threading and module loading bits of the platform API are plain functions with
a `_glfwPlatform` prefix, as these things are independent of what window system is being
used.
Examples: `_glfwPlatformGetTimerValue`
The platform interface also defines structs that contain platform-specific
global and per-object state. Their names mirror those of the internal