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glfw: add glfw.makeContextCurrent

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Signed-off-by: Stephen Gutekanst <stephen@hexops.com>
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Stephen Gutekanst 2021-10-16 14:58:16 -07:00 • committed by Stephen Gutekanst
parent 7ba458d25b
commit a78bf81cd6
1 changed files with 51 additions and 34 deletions
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85
src/opengl.zig
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@ -1,3 +1,38 @@
const std = @import("std");
const c = @import("c.zig").c;
const Window = @import("Window.zig");
const Error = @import("errors.zig").Error;
const getError = @import("errors.zig").getError;
/// Makes the context of the specified window current for the calling thread.
///
/// This function makes the OpenGL or OpenGL ES context of the specified window current on the
/// calling thread. A context must only be made current on a single thread at a time and each
/// thread can have only a single current context at a time.
///
/// When moving a context between threads, you must make it non-current on the old thread before
/// making it current on the new one.
///
/// By default, making a context non-current implicitly forces a pipeline flush. On machines that
/// support `GL_KHR_context_flush_control`, you can control whether a context performs this flush
/// by setting the glfw.context_release_behavior hint.
///
/// The specified window must have an OpenGL or OpenGL ES context. Specifying a window without a
/// context will generate Error.NoWindowContext.
///
/// @param[in] window The window whose context to make current, or null to
/// detach the current context.
///
/// Possible errors include glfw.Error.NotInitialized, glfw.Error.NoWindowContext and glfw.Error.PlatformError.
///
/// @thread_safety This function may be called from any thread.
///
/// see also: context_current, glfwGetCurrentContext
pub inline fn makeContextCurrent(window: ?Window) Error!void {
if (window) |w| c.glfwMakeContextCurrent(w.handle) else c.glfwMakeContextCurrent(null);
}
// TODO(opengl): // TODO(opengl):
// /// Client API function pointer type. // /// Client API function pointer type.
@ -11,40 +46,6 @@
// /// @ingroup context // /// @ingroup context
// typedef void (*GLFWglproc)(void); // typedef void (*GLFWglproc)(void);
// /// Makes the context of the specified window current for the calling
// /// thread.
// ///
// /// This function makes the OpenGL or OpenGL ES context of the specified window
// /// current on the calling thread. A context must only be made current on
// /// a single thread at a time and each thread can have only a single current
// /// context at a time.
// ///
// /// When moving a context between threads, you must make it non-current on the
// /// old thread before making it current on the new one.
// ///
// /// By default, making a context non-current implicitly forces a pipeline flush.
// /// On machines that support `GL_KHR_context_flush_control`, you can control
// /// whether a context performs this flush by setting the
// /// [GLFW_CONTEXT_RELEASE_BEHAVIOR](@ref GLFW_CONTEXT_RELEASE_BEHAVIOR_hint)
// /// hint.
// ///
// /// The specified window must have an OpenGL or OpenGL ES context. Specifying
// /// a window without a context will generate a @ref GLFW_NO_WINDOW_CONTEXT
// /// error.
// ///
// /// @param[in] window The window whose context to make current, or null to
// /// detach the current context.
// ///
// /// Possible errors include glfw.Error.NotInitialized, glfw.Error.NoWindowContext and glfw.Error.PlatformError.
// ///
// /// @thread_safety This function may be called from any thread.
// ///
// /// see also: context_current, glfwGetCurrentContext
// ///
// ///
// /// @ingroup context
// GLFWAPI void glfwMakeContextCurrent(GLFWwindow* window);
// /// Returns the window whose context is current on the calling thread. // /// Returns the window whose context is current on the calling thread.
// /// // ///
// /// This function returns the window whose OpenGL or OpenGL ES context is // /// This function returns the window whose OpenGL or OpenGL ES context is
@ -175,3 +176,19 @@
// /// // ///
// /// @ingroup context // /// @ingroup context
// GLFWAPI GLFWglproc glfwGetProcAddress(const char* procname); // GLFWAPI GLFWglproc glfwGetProcAddress(const char* procname);
test "makeContextCurrent" {
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();
glfw.makeContextCurrent(window) catch |err| std.debug.print("making context current, error={}\n", .{err});
}