adds vendor directory

vendors dependencies in standard `vendor` directory, managed by glide

vendor/github.com/mattn/go-gtk/gtkgl/gdkgl.go

@@ -0,0 +1,34 @@
+// +build !cgocheck
+
+package gtkgl
+
+const (
+	ATTR_NONE             = 0
+	ATTR_USE_GL           = 1
+	ATTR_BUFFER_SIZE      = 2
+	ATTR_LEVEL            = 3
+	ATTR_RGBA             = 4
+	ATTR_DOUBLEBUFFER     = 5
+	ATTR_STEREO           = 6
+	ATTR_AUX_BUFFERS      = 7
+	ATTR_RED_SIZE         = 8
+	ATTR_GREEN_SIZE       = 9
+	ATTR_BLUE_SIZE        = 10
+	ATTR_ALPGHA_SIZE      = 11
+	ATTR_DEPTH_SIZE       = 12
+	ATTR_STENCIL_SIZE     = 13
+	ATTR_ACCUM_RED_SIZE   = 14
+	ATTR_ACCUM_GREEN_SIZE = 15
+	ATTR_ACCUM_BLUE_SIZE  = 16
+	ATTR_ACCUM_ALPHA_SIZE = 17
+)
+
+const (
+	ATTR_X_VISUAL_TYPE_EXT           = 0x22
+	ATTR_TRANSPARENT_TYPE_EXT        = 0x23
+	ATTR_TRANSPARENT_INDEX_VALUE_EXT = 0x24
+	ATTR_TRANSPARENT_RED_VALUE_EXT   = 0x25
+	ATTR_TRANSPARENT_GREEN_VALUE_EXT = 0x26
+	ATTR_TRANSPARENT_BLUE_VALUE_EXT  = 0x27
+	ATTR_TRANSPARENT_ALPHA_VALUE_EXT = 0x28
+)

vendor/github.com/mattn/go-gtk/gtkgl/gtkgl.go.h

@@ -0,0 +1,28 @@
+#ifndef GO_GTKGL_H
+#define GO_GTKGL_H
+
+#include <gtkgl/gdkgl.h>
+#include <gtkgl/gtkglarea.h>
+#include <stdlib.h>
+#include <string.h>
+
+void *make_area(int attr_count, int *attrs) {
+	if (attr_count > 0 && attrs[attr_count-1] == 0) {
+		// already null terminated; use the pointer directly
+		return gtk_gl_area_new(attrs);
+	} else {
+		// make a null terminated copy of the attribute list
+		GtkWidget *area = NULL;
+		int *zattrs = malloc((attr_count+1)*sizeof(int));
+		if (!zattrs) {
+			return NULL;
+		}
+		memcpy(zattrs, attrs, attr_count * sizeof(attrs));
+		zattrs[attr_count] = 0;
+		area = gtk_gl_area_new(zattrs);
+		free(zattrs);
+		return area;
+	}
+}
+
+#endif

vendor/github.com/mattn/go-gtk/gtkgl/gtkglarea.go

@@ -0,0 +1,27 @@
+// +build !cgocheck
+
+package gtkgl
+
+// #include "gtkgl.go.h"
+// #cgo pkg-config: gtkgl-2.0
+import "C"
+
+import "github.com/mattn/go-gtk/gtk"
+import "unsafe"
+
+type GLArea struct {
+	gtk.DrawingArea
+}
+
+func NewGLArea(attrList []int) *GLArea {
+	return &GLArea{gtk.DrawingArea{
+		*gtk.WidgetFromNative(C.make_area(C.int(len(attrList)), (*C.int)(unsafe.Pointer(&attrList[0]))))}}
+}
+
+func (v *GLArea) MakeCurrent() {
+	C.gtk_gl_area_make_current((*C.GtkGLArea)(unsafe.Pointer(v.GWidget)))
+}
+
+func (v *GLArea) SwapBuffers() {
+	C.gtk_gl_area_swap_buffers((*C.GtkGLArea)(unsafe.Pointer(v.GWidget)))
+}