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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
Download Patch File Download Diff File Expand all files Collapse all files
src/init.c
+13 -9
View File
@@ -54,6 +54,7 @@ static _GLFWinitconfig _glfwInitHints =
{
GLFW_TRUE, // hat buttons
GLFW_ANGLE_PLATFORM_TYPE_NONE, // ANGLE backend
GLFW_ANY_PLATFORM, // preferred platform
{
GLFW_TRUE, // macOS menu bar
GLFW_TRUE // macOS bundle chdir
@@ -102,7 +103,7 @@ static void terminate(void)
{
_GLFWmonitor* monitor = _glfw.monitors[i];
if (monitor->originalRamp.size)
_glfwPlatformSetGammaRamp(monitor, &monitor->originalRamp);
_glfw.platform.setGammaRamp(monitor, &monitor->originalRamp);
_glfwFreeMonitor(monitor);
}
@@ -115,8 +116,8 @@ static void terminate(void)
_glfw.mappingCount = 0;
_glfwTerminateVulkan();
_glfwPlatformTerminateJoysticks();
_glfwPlatformTerminate();
_glfw.platform.terminateJoysticks();
_glfw.platform.terminate();
_glfw.initialized = GLFW_FALSE;
@@ -274,6 +275,8 @@ void _glfwInputError(int code, const char* format, ...)
strcpy(description, "The requested feature cannot be implemented for this platform");
else if (code == GLFW_FEATURE_UNIMPLEMENTED)
strcpy(description, "The requested feature has not yet been implemented for this platform");
else if (code == GLFW_PLATFORM_UNAVAILABLE)
strcpy(description, "The requested platform is unavailable");
else
strcpy(description, "ERROR: UNKNOWN GLFW ERROR");
}
@@ -322,7 +325,10 @@ GLFWAPI int glfwInit(void)
_glfw.allocator.deallocate = defaultDeallocate;
}
if (!_glfwPlatformInit())
if (!_glfwSelectPlatform(_glfw.hints.init.platformID, &_glfw.platform))
return GLFW_FALSE;
if (!_glfw.platform.init())
{
terminate();
return GLFW_FALSE;
@@ -367,6 +373,9 @@ GLFWAPI void glfwInitHint(int hint, int value)
case GLFW_ANGLE_PLATFORM_TYPE:
_glfwInitHints.angleType = value;
return;
case GLFW_PLATFORM:
_glfwInitHints.platformID = value;
return;
case GLFW_COCOA_CHDIR_RESOURCES:
_glfwInitHints.ns.chdir = value;
return;
@@ -405,11 +414,6 @@ GLFWAPI void glfwGetVersion(int* major, int* minor, int* rev)
*rev = GLFW_VERSION_REVISION;
}
GLFWAPI const char* glfwGetVersionString(void)
{
return _glfwPlatformGetVersionString();
}
GLFWAPI int glfwGetError(const char** description)
{
_GLFWerror* error;