英文:
Using OpenGL from Go
问题
我正在尝试在Go程序中使用OpenGL。我认为我已经准备好了所有的部分,但是我还不能完全运行它。
我的C编译器是mingw的64位版本。它在我的%PATH%
变量中,并且我已经通过cgo
文档中的随机数示例验证了它的工作。
我通过将bin、lib和include文件夹复制到mingw-w64安装中的\mingw\x86_64-w64-mingw32
等效位置来安装了64位的GLEW 1.9.0。
当我尝试运行go get github.com/go-gl/gl
时,go回复如下:
In file included from attriblocation.go:7:0:
gl.h:5:25: error: enumerator value for '__cgo_enum__5' is not an integer constant
#define GLEW_GET_FUN(x) (*x)
^
d:\programs\mingw64\x86_64-w64-mingw32\include\gl\glew.h:1956:26: note: in expansion of macro 'GLEW_GET_FUN'
#define glVertexAttrib3f GLEW_GET_FUN(__glewVertexAttrib3f)
^
gl.h:5:25: error: enumerator value for '__cgo_enum__6' is not an integer constant
#define GLEW_GET_FUN(x) (*x)
这些错误以类似的方式继续出现,直到__cgo_enum__15
的值。我还从Go方面得到了一些匹配的错误。
有什么想法可以让这个工作起来吗?
编辑: 这里是来自Go方面的'匹配'日志。
attriblocation.go:42:2: error: initializer element is not constant
func (indx AttribLocation) Attrib4fv(values *[4]float32) {
^
attriblocation.go:42:2: error: (near initialization for '__cgodebug_data[5]')
attriblocation.go:43:2: error: initializer element is not constant
C.glVertexAttrib4fv(C.GLuint(indx), (*C.GLfloat)(&values[0]))
^
attriblocation.go:43:2: error: (near initialization for '__cgodebug_data[6]')
attriblocation.go:44:2: error: initializer element is not constant
}
每个__cgodebug_data[]
5-15都有一个。
编辑2: 我被要求附上一些日志。这是我使用GCC 4.8编译时发生的情况,以及这是我使用4.7和4.6时得到的结果。
英文:
I am trying to use OpenGL from within a Go program. I think I have all of the pieces in place, but I am still not quite able to get it running.
My C compiler is the 64-bit version of mingw. It is in my %PATH%
variable, and I have verified it working with the random number example in the cgo
documentation.
I installed the 64-bit GLEW 1.9.0 by coping the bin, lib, and include folders to the \mingw\x86_64-w64-mingw32
equivalents in my mingw-w64 installation.
When I try and run go get github.com/go-gl/gl
, go replies with the following:
In file included from attriblocation.go:7:0:
gl.h:5:25: error: enumerator value for '__cgo_enum__5' is not an integer constant
#define GLEW_GET_FUN(x) (*x)
^
d:\programs\mingw64\x86_64-w64-mingw32\include\gl\glew.h:1956:26: note: in expansion of macro 'GLEW_GET_FUN'
#define glVertexAttrib3f GLEW_GET_FUN(__glewVertexAttrib3f)
^
gl.h:5:25: error: enumerator value for '__cgo_enum__6' is not an integer constant
#define GLEW_GET_FUN(x) (*x)
These errors continue in a similar fashion for values up to __cgo_enum__15
. I also get some matching errors coming from the Go side of things for each entry.
Any ideas on what I am missing to get this to work?
Edit: Here are the 'matching' logs from the Go side of things.
attriblocation.go:42:2: error: initializer element is not constant
func (indx AttribLocation) Attrib4fv(values *[4]float32) {
^
attriblocation.go:42:2: error: (near initialization for '__cgodebug_data[5]')
attriblocation.go:43:2: error: initializer element is not constant
C.glVertexAttrib4fv(C.GLuint(indx), (*C.GLfloat)(&values[0]))
^
attriblocation.go:43:2: error: (near initialization for '__cgodebug_data[6]')
attriblocation.go:44:2: error: initializer element is not constant
}
There is one for every __cgodebug_data[]
5-15.
Edit 2: I have been asked to attach some logs. Here is what happens when I compile with GCC 4.8, and Here is what I get with 4.7 and 4.6.
答案1
得分: 3
看起来这是Go语言中的一个缺陷,以及C/Go编译器之间的通信方式。解决方法是设置CGO_CFLAGS=-ftrack-macro-expansion=0 go build
。你也可以使用go-1.2rc5
或更新版本来解决这个问题。这个bug已经在之前的解决方法中关闭。
英文:
It looks like it is a defect in Go and how the C/Go compilers communicate with each other. The workaround is to set CGO_CFLAGS=-ftrack-macro-expansion=0 go build
. You could also use go-1.2rc5
or newer to fix the issue. This bug has been closed with the previous workarounds/fixes specified.
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