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glfw: add glfw.extensionSupported

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
This commit is contained in:
Stephen Gutekanst 2021-10-16 15:33:06 -07:00 • committed by Stephen Gutekanst
parent 8783efeb4e
commit 47f2324400
1 changed files with 48 additions and 35 deletions
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83
glfw/src/opengl.zig
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@ -90,40 +90,36 @@ pub inline fn swapInterval(interval: isize) Error!void {
try getError();
}
// TODO(opengl):
// /// Returns whether the specified extension is available.
// ///
// /// This function returns whether the specified
// /// [API extension](@ref context_glext) is supported by the current OpenGL or
// /// OpenGL ES context. It searches both for client API extension and context
// /// creation API extensions.
// ///
// /// A context must be current on the calling thread. Calling this function
// /// without a current context will cause a @ref GLFW_NO_CURRENT_CONTEXT error.
// ///
// /// As this functions retrieves and searches one or more extension strings each
// /// call, it is recommended that you cache its results if it is going to be used
// /// frequently. The extension strings will not change during the lifetime of
// /// a context, so there is no danger in doing this.
// ///
// /// This function does not apply to Vulkan. If you are using Vulkan, see @ref
// /// glfw.getRequiredInstanceExtensions, `vkEnumerateInstanceExtensionProperties`
// /// and `vkEnumerateDeviceExtensionProperties` instead.
// ///
// /// @param[in] extension The ASCII encoded name of the extension.
// /// @return `GLFW_TRUE` if the extension is available, or `GLFW_FALSE`
// /// otherwise.
// ///
// /// Possible errors include glfw.Error.NotInitialized, glfw.Error.NoCurrentContext, glfw.Error.InvalidValue and glfw.Error.PlatformError.
// ///
// /// @thread_safety This function may be called from any thread.
// ///
// /// see also: context_glext, glfwGetProcAddress
// ///
// ///
// /// @ingroup context
// GLFWAPI int glfwExtensionSupported(const char* extension);
/// Returns whether the specified extension is available.
///
/// This function returns whether the specified API extension (see context_glext) is supported by
/// the current OpenGL or OpenGL ES context. It searches both for client API extension and context
/// creation API extensions.
///
/// A context must be current on the calling thread. Calling this function without a current
/// context will cause Error.NoCurrentContext.
///
/// As this functions retrieves and searches one or more extension strings each call, it is
/// recommended that you cache its results if it is going to be used frequently. The extension
/// strings will not change during the lifetime of a context, so there is no danger in doing this.
///
/// This function does not apply to Vulkan. If you are using Vulkan, see glfw.getRequiredInstanceExtensions,
/// `vkEnumerateInstanceExtensionProperties` and `vkEnumerateDeviceExtensionProperties` instead.
///
/// @param[in] extension The ASCII encoded name of the extension.
/// @return `true` if the extension is available, or `false` otherwise.
///
/// Possible errors include glfw.Error.NotInitialized, glfw.Error.NoCurrentContext, glfw.Error.InvalidValue
/// and glfw.Error.PlatformError.
///
/// @thread_safety This function may be called from any thread.
///
/// see also: context_glext, glfw.getProcAddress
pub inline fn extensionSupported(extension: [*c]const u8) Error!bool {
const supported = c.glfwExtensionSupported(extension);
try getError();
return supported == c.GLFW_TRUE;
}
/// Client API function pointer type.
///
@ -160,7 +156,7 @@ pub const GLProc = fn () callconv(.C) void;
///
/// see also: context_glext, glfwExtensionSupported
pub inline fn getProcAddress(proc_name: [*c]const u8) Error!?GLProc {
const proc_address = c.glfwGetProcAddress(&proc_name[0]);
const proc_address = c.glfwGetProcAddress(proc_name);
try getError();
if (proc_address) |addr| return addr;
return null;
@ -227,3 +223,20 @@ test "getProcAddress" {
try glfw.makeContextCurrent(window);
_ = glfw.getProcAddress("foobar") catch |err| std.debug.print("failed to get proc address, error={}\n", .{err});
}
test "extensionSupported" {
const glfw = @import("main.zig");
try glfw.init();
defer glfw.terminate();
const window = glfw.Window.create(640, 480, "Hello, Zig!", null, null) catch |err| {
// return without fail, because most of our CI environments are headless / we cannot open
// windows on them.
std.debug.print("note: failed to create window: {}\n", .{err});
return;
};
defer window.destroy();
try glfw.makeContextCurrent(window);
_ = glfw.extensionSupported("foobar") catch |err| std.debug.print("failed to check if extension supported, error={}\n", .{err});
}