If you tried using OpenGL with something other than Apple's framework then
you probably didn't get very far. The header files of GLEW and Epoxy aren't
fully understood by Swift. So I wrote some Swift code that generates some
Swift code using the XML file from Khronos. Now everything you usually get
from the headers is Swift code.
The Demo folder contains an OpenGL equivalent of hello world. This is also
a good example to look at if you want to learn more about C bindings.
-david
Nice! Having done OpenGL bindings for other languages, I know this isn't a trivial task. Giving the functions argument labels is a nice touch.
-Joe
On Dec 10, 2015, at 9:22 PM, David Turnbull via swift-users <swift-users@swift.org> wrote:
If you tried using OpenGL with something other than Apple's framework then you probably didn't get very far. The header files of GLEW and Epoxy aren't fully understood by Swift. So I wrote some Swift code that generates some Swift code using the XML file from Khronos. Now everything you usually get from the headers is Swift code.
GitHub - AE9RB/SwiftGL: This project has moved.
The Demo folder contains an OpenGL equivalent of hello world. This is also a good example to look at if you want to learn more about C bindings.
https://github.com/AE9RB/SwiftGL/tree/master/Demo
-david
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It's looking like the Epoxy requirement for SwiftGL is going away real soon
now. I was able to lookup the OpenGL symbols from pure Swift code. No
compiled C code is needed at all. What follows is roughly how I will do it.
It lazily loads the pointer the first time you use it. The Linux version is
only slightly different.
Does anyone know a way to do this without the unsafeBitCast?
import Darwin
let handle = dlopen(
"/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL",
RTLD_LAZY)
func DLOADglGetIntegerv(a:GLenum, _ b:UnsafeMutablePointer<GLint>) -> Void {
glGetIntegerv = unsafeBitCast(dlsym(handle, "glGetIntegerv"),
glGetIntegerv.dynamicType)
glGetIntegerv(a,b)
}
public var glGetIntegerv:@convention(c) (GLenum, UnsafeMutablePointer<GLint>)
-> Void = { DLOADglGetIntegerv($0,$1) }
On Thu, Dec 10, 2015 at 9:22 PM, David Turnbull <dturnbull@gmail.com> wrote:
If you tried using OpenGL with something other than Apple's framework then
you probably didn't get very far. The header files of GLEW and Epoxy aren't
fully understood by Swift. So I wrote some Swift code that generates some
Swift code using the XML file from Khronos. Now everything you usually get
from the headers is Swift code.GitHub - AE9RB/SwiftGL: This project has moved.
The Demo folder contains an OpenGL equivalent of hello world. This is also
a good example to look at if you want to learn more about C bindings.https://github.com/AE9RB/SwiftGL/tree/master/Demo
-david
This is a great use case for multiline string literals! 
On Dec 11, 2015, at 10:56 PM, Joe Groff via swift-users <swift-users@swift.org> wrote:
Nice! Having done OpenGL bindings for other languages, I know this isn't a trivial task. Giving the functions argument labels is a nice touch.
-Joe
On Dec 10, 2015, at 9:22 PM, David Turnbull via swift-users <swift-users@swift.org> wrote:
If you tried using OpenGL with something other than Apple's framework then you probably didn't get very far. The header files of GLEW and Epoxy aren't fully understood by Swift. So I wrote some Swift code that generates some Swift code using the XML file from Khronos. Now everything you usually get from the headers is Swift code.
GitHub - AE9RB/SwiftGL: This project has moved.
The Demo folder contains an OpenGL equivalent of hello world. This is also a good example to look at if you want to learn more about C bindings.
https://github.com/AE9RB/SwiftGL/tree/master/Demo
-david
_______________________________________________
swift-users mailing list
swift-users@swift.org
https://lists.swift.org/mailman/listinfo/swift-users_______________________________________________
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https://lists.swift.org/mailman/listinfo/swift-users
I think the unsafeBitCast is fundamentally necessary here to coerce the void pointer you get from dlsym to a C function pointer. I don't think it's a problem. This is pretty awesome!
-Joe
On Dec 12, 2015, at 1:39 PM, David Turnbull via swift-users <swift-users@swift.org> wrote:
It's looking like the Epoxy requirement for SwiftGL is going away real soon now. I was able to lookup the OpenGL symbols from pure Swift code. No compiled C code is needed at all. What follows is roughly how I will do it. It lazily loads the pointer the first time you use it. The Linux version is only slightly different.
Does anyone know a way to do this without the unsafeBitCast?
import Darwin
let handle = dlopen("/System/Library/Frameworks/OpenGL.framework/Versions/Current/OpenGL", RTLD_LAZY)
func DLOADglGetIntegerv(a:GLenum, _ b:UnsafeMutablePointer<GLint>) -> Void {
glGetIntegerv = unsafeBitCast(dlsym(handle, "glGetIntegerv"), glGetIntegerv.dynamicType)
glGetIntegerv(a,b)
}public var glGetIntegerv:@convention(c) (GLenum, UnsafeMutablePointer<GLint>) -> Void = { DLOADglGetIntegerv($0,$1) }
It's all generated code from a canonical XML source so really not at all
unsafe. Certainly no more unsafe than fixing up a C header file that
doesn't quite work with Swift.
-david (https://github.com/AE9RB/SwiftGL\)
On Mon, Dec 14, 2015 at 9:22 AM, Joe Groff <jgroff@apple.com> wrote:
I think the unsafeBitCast is fundamentally necessary here