panic when an extension request is issued before an extension has been initialized. but give a nice error message for the happy people.

1 files changed, 193 insertions, 7 deletions

diff --git a/nexgb/render/render.go b/nexgb/render/render.go
index 65b0723..f7fa79f 100644
--- a/nexgb/render/render.go
+++ b/nexgb/render/render.go
@@ -2,7 +2,7 @@
 package render
 
 /*
-	This file was generated by render.xml on May 11 2012 1:58:36am EDT.
+	This file was generated by render.xml on May 11 2012 11:57:19pm EDT.
 	This file is automatically generated. Edit at your peril!
 */
 
@@ -40,12 +40,6 @@ func init() {
 	xgb.NewExtErrorFuncs["RENDER"] = make(map[int]xgb.NewErrorFun)
 }
 
-// Skipping definition for base type 'Card32'
-
-// Skipping definition for base type 'Double'
-
-// Skipping definition for base type 'Bool'
-
 // Skipping definition for base type 'Float'
 
 // Skipping definition for base type 'Card8'
@@ -64,6 +58,12 @@ func init() {
 
 // Skipping definition for base type 'Char'
 
+// Skipping definition for base type 'Card32'
+
+// Skipping definition for base type 'Double'
+
+// Skipping definition for base type 'Bool'
+
 const (
 	PictTypeIndexed = 0
 	PictTypeDirect  = 1
@@ -1585,6 +1585,9 @@ type QueryVersionCookie struct {
 // QueryVersion sends a checked request.
 // If an error occurs, it will be returned with the reply by calling QueryVersionCookie.Reply()
 func QueryVersion(c *xgb.Conn, ClientMajorVersion uint32, ClientMinorVersion uint32) QueryVersionCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'QueryVersion' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(queryVersionRequest(c, ClientMajorVersion, ClientMinorVersion), cookie)
 	return QueryVersionCookie{cookie}
@@ -1593,6 +1596,9 @@ func QueryVersion(c *xgb.Conn, ClientMajorVersion uint32, ClientMinorVersion uin
 // QueryVersionUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func QueryVersionUnchecked(c *xgb.Conn, ClientMajorVersion uint32, ClientMinorVersion uint32) QueryVersionCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'QueryVersion' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(queryVersionRequest(c, ClientMajorVersion, ClientMinorVersion), cookie)
 	return QueryVersionCookie{cookie}
@@ -1677,6 +1683,9 @@ type QueryPictFormatsCookie struct {
 // QueryPictFormats sends a checked request.
 // If an error occurs, it will be returned with the reply by calling QueryPictFormatsCookie.Reply()
 func QueryPictFormats(c *xgb.Conn) QueryPictFormatsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'QueryPictFormats' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(queryPictFormatsRequest(c), cookie)
 	return QueryPictFormatsCookie{cookie}
@@ -1685,6 +1694,9 @@ func QueryPictFormats(c *xgb.Conn) QueryPictFormatsCookie {
 // QueryPictFormatsUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func QueryPictFormatsUnchecked(c *xgb.Conn) QueryPictFormatsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'QueryPictFormats' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(queryPictFormatsRequest(c), cookie)
 	return QueryPictFormatsCookie{cookie}
@@ -1791,6 +1803,9 @@ type QueryPictIndexValuesCookie struct {
 // QueryPictIndexValues sends a checked request.
 // If an error occurs, it will be returned with the reply by calling QueryPictIndexValuesCookie.Reply()
 func QueryPictIndexValues(c *xgb.Conn, Format Pictformat) QueryPictIndexValuesCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'QueryPictIndexValues' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(queryPictIndexValuesRequest(c, Format), cookie)
 	return QueryPictIndexValuesCookie{cookie}
@@ -1799,6 +1814,9 @@ func QueryPictIndexValues(c *xgb.Conn, Format Pictformat) QueryPictIndexValuesCo
 // QueryPictIndexValuesUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func QueryPictIndexValuesUnchecked(c *xgb.Conn, Format Pictformat) QueryPictIndexValuesCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'QueryPictIndexValues' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(queryPictIndexValuesRequest(c, Format), cookie)
 	return QueryPictIndexValuesCookie{cookie}
@@ -1880,6 +1898,9 @@ type CreatePictureCookie struct {
 // CreatePicture sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreatePicture(c *xgb.Conn, Pid Picture, Drawable xproto.Drawable, Format Pictformat, ValueMask uint32, ValueList []uint32) CreatePictureCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreatePicture' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createPictureRequest(c, Pid, Drawable, Format, ValueMask, ValueList), cookie)
 	return CreatePictureCookie{cookie}
@@ -1888,6 +1909,9 @@ func CreatePicture(c *xgb.Conn, Pid Picture, Drawable xproto.Drawable, Format Pi
 // CreatePictureChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreatePictureCookie.Check()
 func CreatePictureChecked(c *xgb.Conn, Pid Picture, Drawable xproto.Drawable, Format Pictformat, ValueMask uint32, ValueList []uint32) CreatePictureCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreatePicture' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createPictureRequest(c, Pid, Drawable, Format, ValueMask, ValueList), cookie)
 	return CreatePictureCookie{cookie}
@@ -1943,6 +1967,9 @@ type ChangePictureCookie struct {
 // ChangePicture sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func ChangePicture(c *xgb.Conn, Picture Picture, ValueMask uint32, ValueList []uint32) ChangePictureCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'ChangePicture' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(changePictureRequest(c, Picture, ValueMask, ValueList), cookie)
 	return ChangePictureCookie{cookie}
@@ -1951,6 +1978,9 @@ func ChangePicture(c *xgb.Conn, Picture Picture, ValueMask uint32, ValueList []u
 // ChangePictureChecked sends a checked request.
 // If an error occurs, it can be retrieved using ChangePictureCookie.Check()
 func ChangePictureChecked(c *xgb.Conn, Picture Picture, ValueMask uint32, ValueList []uint32) ChangePictureCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'ChangePicture' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(changePictureRequest(c, Picture, ValueMask, ValueList), cookie)
 	return ChangePictureCookie{cookie}
@@ -2000,6 +2030,9 @@ type SetPictureClipRectanglesCookie struct {
 // SetPictureClipRectangles sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func SetPictureClipRectangles(c *xgb.Conn, Picture Picture, ClipXOrigin int16, ClipYOrigin int16, Rectangles []xproto.Rectangle) SetPictureClipRectanglesCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'SetPictureClipRectangles' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(setPictureClipRectanglesRequest(c, Picture, ClipXOrigin, ClipYOrigin, Rectangles), cookie)
 	return SetPictureClipRectanglesCookie{cookie}
@@ -2008,6 +2041,9 @@ func SetPictureClipRectangles(c *xgb.Conn, Picture Picture, ClipXOrigin int16, C
 // SetPictureClipRectanglesChecked sends a checked request.
 // If an error occurs, it can be retrieved using SetPictureClipRectanglesCookie.Check()
 func SetPictureClipRectanglesChecked(c *xgb.Conn, Picture Picture, ClipXOrigin int16, ClipYOrigin int16, Rectangles []xproto.Rectangle) SetPictureClipRectanglesCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'SetPictureClipRectangles' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(setPictureClipRectanglesRequest(c, Picture, ClipXOrigin, ClipYOrigin, Rectangles), cookie)
 	return SetPictureClipRectanglesCookie{cookie}
@@ -2057,6 +2093,9 @@ type FreePictureCookie struct {
 // FreePicture sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func FreePicture(c *xgb.Conn, Picture Picture) FreePictureCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'FreePicture' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(freePictureRequest(c, Picture), cookie)
 	return FreePictureCookie{cookie}
@@ -2065,6 +2104,9 @@ func FreePicture(c *xgb.Conn, Picture Picture) FreePictureCookie {
 // FreePictureChecked sends a checked request.
 // If an error occurs, it can be retrieved using FreePictureCookie.Check()
 func FreePictureChecked(c *xgb.Conn, Picture Picture) FreePictureCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'FreePicture' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(freePictureRequest(c, Picture), cookie)
 	return FreePictureCookie{cookie}
@@ -2106,6 +2148,9 @@ type CompositeCookie struct {
 // Composite sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func Composite(c *xgb.Conn, Op byte, Src Picture, Mask Picture, Dst Picture, SrcX int16, SrcY int16, MaskX int16, MaskY int16, DstX int16, DstY int16, Width uint16, Height uint16) CompositeCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'Composite' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(compositeRequest(c, Op, Src, Mask, Dst, SrcX, SrcY, MaskX, MaskY, DstX, DstY, Width, Height), cookie)
 	return CompositeCookie{cookie}
@@ -2114,6 +2159,9 @@ func Composite(c *xgb.Conn, Op byte, Src Picture, Mask Picture, Dst Picture, Src
 // CompositeChecked sends a checked request.
 // If an error occurs, it can be retrieved using CompositeCookie.Check()
 func CompositeChecked(c *xgb.Conn, Op byte, Src Picture, Mask Picture, Dst Picture, SrcX int16, SrcY int16, MaskX int16, MaskY int16, DstX int16, DstY int16, Width uint16, Height uint16) CompositeCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'Composite' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(compositeRequest(c, Op, Src, Mask, Dst, SrcX, SrcY, MaskX, MaskY, DstX, DstY, Width, Height), cookie)
 	return CompositeCookie{cookie}
@@ -2190,6 +2238,9 @@ type TrapezoidsCookie struct {
 // Trapezoids sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func Trapezoids(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, SrcX int16, SrcY int16, Traps []Trapezoid) TrapezoidsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'Trapezoids' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(trapezoidsRequest(c, Op, Src, Dst, MaskFormat, SrcX, SrcY, Traps), cookie)
 	return TrapezoidsCookie{cookie}
@@ -2198,6 +2249,9 @@ func Trapezoids(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictf
 // TrapezoidsChecked sends a checked request.
 // If an error occurs, it can be retrieved using TrapezoidsCookie.Check()
 func TrapezoidsChecked(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, SrcX int16, SrcY int16, Traps []Trapezoid) TrapezoidsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'Trapezoids' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(trapezoidsRequest(c, Op, Src, Dst, MaskFormat, SrcX, SrcY, Traps), cookie)
 	return TrapezoidsCookie{cookie}
@@ -2258,6 +2312,9 @@ type TrianglesCookie struct {
 // Triangles sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func Triangles(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, SrcX int16, SrcY int16, Triangles []Triangle) TrianglesCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'Triangles' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(trianglesRequest(c, Op, Src, Dst, MaskFormat, SrcX, SrcY, Triangles), cookie)
 	return TrianglesCookie{cookie}
@@ -2266,6 +2323,9 @@ func Triangles(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictfo
 // TrianglesChecked sends a checked request.
 // If an error occurs, it can be retrieved using TrianglesCookie.Check()
 func TrianglesChecked(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, SrcX int16, SrcY int16, Triangles []Triangle) TrianglesCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'Triangles' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(trianglesRequest(c, Op, Src, Dst, MaskFormat, SrcX, SrcY, Triangles), cookie)
 	return TrianglesCookie{cookie}
@@ -2326,6 +2386,9 @@ type TriStripCookie struct {
 // TriStrip sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func TriStrip(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, SrcX int16, SrcY int16, Points []Pointfix) TriStripCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'TriStrip' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(triStripRequest(c, Op, Src, Dst, MaskFormat, SrcX, SrcY, Points), cookie)
 	return TriStripCookie{cookie}
@@ -2334,6 +2397,9 @@ func TriStrip(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictfor
 // TriStripChecked sends a checked request.
 // If an error occurs, it can be retrieved using TriStripCookie.Check()
 func TriStripChecked(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, SrcX int16, SrcY int16, Points []Pointfix) TriStripCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'TriStrip' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(triStripRequest(c, Op, Src, Dst, MaskFormat, SrcX, SrcY, Points), cookie)
 	return TriStripCookie{cookie}
@@ -2394,6 +2460,9 @@ type TriFanCookie struct {
 // TriFan sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func TriFan(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, SrcX int16, SrcY int16, Points []Pointfix) TriFanCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'TriFan' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(triFanRequest(c, Op, Src, Dst, MaskFormat, SrcX, SrcY, Points), cookie)
 	return TriFanCookie{cookie}
@@ -2402,6 +2471,9 @@ func TriFan(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictforma
 // TriFanChecked sends a checked request.
 // If an error occurs, it can be retrieved using TriFanCookie.Check()
 func TriFanChecked(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, SrcX int16, SrcY int16, Points []Pointfix) TriFanCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'TriFan' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(triFanRequest(c, Op, Src, Dst, MaskFormat, SrcX, SrcY, Points), cookie)
 	return TriFanCookie{cookie}
@@ -2462,6 +2534,9 @@ type CreateGlyphSetCookie struct {
 // CreateGlyphSet sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateGlyphSet(c *xgb.Conn, Gsid Glyphset, Format Pictformat) CreateGlyphSetCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateGlyphSet' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createGlyphSetRequest(c, Gsid, Format), cookie)
 	return CreateGlyphSetCookie{cookie}
@@ -2470,6 +2545,9 @@ func CreateGlyphSet(c *xgb.Conn, Gsid Glyphset, Format Pictformat) CreateGlyphSe
 // CreateGlyphSetChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateGlyphSetCookie.Check()
 func CreateGlyphSetChecked(c *xgb.Conn, Gsid Glyphset, Format Pictformat) CreateGlyphSetCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateGlyphSet' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createGlyphSetRequest(c, Gsid, Format), cookie)
 	return CreateGlyphSetCookie{cookie}
@@ -2514,6 +2592,9 @@ type ReferenceGlyphSetCookie struct {
 // ReferenceGlyphSet sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func ReferenceGlyphSet(c *xgb.Conn, Gsid Glyphset, Existing Glyphset) ReferenceGlyphSetCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'ReferenceGlyphSet' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(referenceGlyphSetRequest(c, Gsid, Existing), cookie)
 	return ReferenceGlyphSetCookie{cookie}
@@ -2522,6 +2603,9 @@ func ReferenceGlyphSet(c *xgb.Conn, Gsid Glyphset, Existing Glyphset) ReferenceG
 // ReferenceGlyphSetChecked sends a checked request.
 // If an error occurs, it can be retrieved using ReferenceGlyphSetCookie.Check()
 func ReferenceGlyphSetChecked(c *xgb.Conn, Gsid Glyphset, Existing Glyphset) ReferenceGlyphSetCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'ReferenceGlyphSet' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(referenceGlyphSetRequest(c, Gsid, Existing), cookie)
 	return ReferenceGlyphSetCookie{cookie}
@@ -2566,6 +2650,9 @@ type FreeGlyphSetCookie struct {
 // FreeGlyphSet sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func FreeGlyphSet(c *xgb.Conn, Glyphset Glyphset) FreeGlyphSetCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'FreeGlyphSet' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(freeGlyphSetRequest(c, Glyphset), cookie)
 	return FreeGlyphSetCookie{cookie}
@@ -2574,6 +2661,9 @@ func FreeGlyphSet(c *xgb.Conn, Glyphset Glyphset) FreeGlyphSetCookie {
 // FreeGlyphSetChecked sends a checked request.
 // If an error occurs, it can be retrieved using FreeGlyphSetCookie.Check()
 func FreeGlyphSetChecked(c *xgb.Conn, Glyphset Glyphset) FreeGlyphSetCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'FreeGlyphSet' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(freeGlyphSetRequest(c, Glyphset), cookie)
 	return FreeGlyphSetCookie{cookie}
@@ -2615,6 +2705,9 @@ type AddGlyphsCookie struct {
 // AddGlyphs sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func AddGlyphs(c *xgb.Conn, Glyphset Glyphset, GlyphsLen uint32, Glyphids []uint32, Glyphs []Glyphinfo, Data []byte) AddGlyphsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'AddGlyphs' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(addGlyphsRequest(c, Glyphset, GlyphsLen, Glyphids, Glyphs, Data), cookie)
 	return AddGlyphsCookie{cookie}
@@ -2623,6 +2716,9 @@ func AddGlyphs(c *xgb.Conn, Glyphset Glyphset, GlyphsLen uint32, Glyphids []uint
 // AddGlyphsChecked sends a checked request.
 // If an error occurs, it can be retrieved using AddGlyphsCookie.Check()
 func AddGlyphsChecked(c *xgb.Conn, Glyphset Glyphset, GlyphsLen uint32, Glyphids []uint32, Glyphs []Glyphinfo, Data []byte) AddGlyphsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'AddGlyphs' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(addGlyphsRequest(c, Glyphset, GlyphsLen, Glyphids, Glyphs, Data), cookie)
 	return AddGlyphsCookie{cookie}
@@ -2678,6 +2774,9 @@ type FreeGlyphsCookie struct {
 // FreeGlyphs sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func FreeGlyphs(c *xgb.Conn, Glyphset Glyphset, Glyphs []Glyph) FreeGlyphsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'FreeGlyphs' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(freeGlyphsRequest(c, Glyphset, Glyphs), cookie)
 	return FreeGlyphsCookie{cookie}
@@ -2686,6 +2785,9 @@ func FreeGlyphs(c *xgb.Conn, Glyphset Glyphset, Glyphs []Glyph) FreeGlyphsCookie
 // FreeGlyphsChecked sends a checked request.
 // If an error occurs, it can be retrieved using FreeGlyphsCookie.Check()
 func FreeGlyphsChecked(c *xgb.Conn, Glyphset Glyphset, Glyphs []Glyph) FreeGlyphsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'FreeGlyphs' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(freeGlyphsRequest(c, Glyphset, Glyphs), cookie)
 	return FreeGlyphsCookie{cookie}
@@ -2733,6 +2835,9 @@ type CompositeGlyphs8Cookie struct {
 // CompositeGlyphs8 sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CompositeGlyphs8(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, Glyphset Glyphset, SrcX int16, SrcY int16, Glyphcmds []byte) CompositeGlyphs8Cookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CompositeGlyphs8' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(compositeGlyphs8Request(c, Op, Src, Dst, MaskFormat, Glyphset, SrcX, SrcY, Glyphcmds), cookie)
 	return CompositeGlyphs8Cookie{cookie}
@@ -2741,6 +2846,9 @@ func CompositeGlyphs8(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat
 // CompositeGlyphs8Checked sends a checked request.
 // If an error occurs, it can be retrieved using CompositeGlyphs8Cookie.Check()
 func CompositeGlyphs8Checked(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, Glyphset Glyphset, SrcX int16, SrcY int16, Glyphcmds []byte) CompositeGlyphs8Cookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CompositeGlyphs8' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(compositeGlyphs8Request(c, Op, Src, Dst, MaskFormat, Glyphset, SrcX, SrcY, Glyphcmds), cookie)
 	return CompositeGlyphs8Cookie{cookie}
@@ -2805,6 +2913,9 @@ type CompositeGlyphs16Cookie struct {
 // CompositeGlyphs16 sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CompositeGlyphs16(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, Glyphset Glyphset, SrcX int16, SrcY int16, Glyphcmds []byte) CompositeGlyphs16Cookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CompositeGlyphs16' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(compositeGlyphs16Request(c, Op, Src, Dst, MaskFormat, Glyphset, SrcX, SrcY, Glyphcmds), cookie)
 	return CompositeGlyphs16Cookie{cookie}
@@ -2813,6 +2924,9 @@ func CompositeGlyphs16(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskForma
 // CompositeGlyphs16Checked sends a checked request.
 // If an error occurs, it can be retrieved using CompositeGlyphs16Cookie.Check()
 func CompositeGlyphs16Checked(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, Glyphset Glyphset, SrcX int16, SrcY int16, Glyphcmds []byte) CompositeGlyphs16Cookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CompositeGlyphs16' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(compositeGlyphs16Request(c, Op, Src, Dst, MaskFormat, Glyphset, SrcX, SrcY, Glyphcmds), cookie)
 	return CompositeGlyphs16Cookie{cookie}
@@ -2877,6 +2991,9 @@ type CompositeGlyphs32Cookie struct {
 // CompositeGlyphs32 sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CompositeGlyphs32(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, Glyphset Glyphset, SrcX int16, SrcY int16, Glyphcmds []byte) CompositeGlyphs32Cookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CompositeGlyphs32' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(compositeGlyphs32Request(c, Op, Src, Dst, MaskFormat, Glyphset, SrcX, SrcY, Glyphcmds), cookie)
 	return CompositeGlyphs32Cookie{cookie}
@@ -2885,6 +3002,9 @@ func CompositeGlyphs32(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskForma
 // CompositeGlyphs32Checked sends a checked request.
 // If an error occurs, it can be retrieved using CompositeGlyphs32Cookie.Check()
 func CompositeGlyphs32Checked(c *xgb.Conn, Op byte, Src Picture, Dst Picture, MaskFormat Pictformat, Glyphset Glyphset, SrcX int16, SrcY int16, Glyphcmds []byte) CompositeGlyphs32Cookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CompositeGlyphs32' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(compositeGlyphs32Request(c, Op, Src, Dst, MaskFormat, Glyphset, SrcX, SrcY, Glyphcmds), cookie)
 	return CompositeGlyphs32Cookie{cookie}
@@ -2949,6 +3069,9 @@ type FillRectanglesCookie struct {
 // FillRectangles sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func FillRectangles(c *xgb.Conn, Op byte, Dst Picture, Color Color, Rects []xproto.Rectangle) FillRectanglesCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'FillRectangles' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(fillRectanglesRequest(c, Op, Dst, Color, Rects), cookie)
 	return FillRectanglesCookie{cookie}
@@ -2957,6 +3080,9 @@ func FillRectangles(c *xgb.Conn, Op byte, Dst Picture, Color Color, Rects []xpro
 // FillRectanglesChecked sends a checked request.
 // If an error occurs, it can be retrieved using FillRectanglesCookie.Check()
 func FillRectanglesChecked(c *xgb.Conn, Op byte, Dst Picture, Color Color, Rects []xproto.Rectangle) FillRectanglesCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'FillRectangles' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(fillRectanglesRequest(c, Op, Dst, Color, Rects), cookie)
 	return FillRectanglesCookie{cookie}
@@ -3011,6 +3137,9 @@ type CreateCursorCookie struct {
 // CreateCursor sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateCursor(c *xgb.Conn, Cid xproto.Cursor, Source Picture, X uint16, Y uint16) CreateCursorCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateCursor' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createCursorRequest(c, Cid, Source, X, Y), cookie)
 	return CreateCursorCookie{cookie}
@@ -3019,6 +3148,9 @@ func CreateCursor(c *xgb.Conn, Cid xproto.Cursor, Source Picture, X uint16, Y ui
 // CreateCursorChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateCursorCookie.Check()
 func CreateCursorChecked(c *xgb.Conn, Cid xproto.Cursor, Source Picture, X uint16, Y uint16) CreateCursorCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateCursor' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createCursorRequest(c, Cid, Source, X, Y), cookie)
 	return CreateCursorCookie{cookie}
@@ -3069,6 +3201,9 @@ type SetPictureTransformCookie struct {
 // SetPictureTransform sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func SetPictureTransform(c *xgb.Conn, Picture Picture, Transform Transform) SetPictureTransformCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'SetPictureTransform' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(setPictureTransformRequest(c, Picture, Transform), cookie)
 	return SetPictureTransformCookie{cookie}
@@ -3077,6 +3212,9 @@ func SetPictureTransform(c *xgb.Conn, Picture Picture, Transform Transform) SetP
 // SetPictureTransformChecked sends a checked request.
 // If an error occurs, it can be retrieved using SetPictureTransformCookie.Check()
 func SetPictureTransformChecked(c *xgb.Conn, Picture Picture, Transform Transform) SetPictureTransformCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'SetPictureTransform' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(setPictureTransformRequest(c, Picture, Transform), cookie)
 	return SetPictureTransformCookie{cookie}
@@ -3124,6 +3262,9 @@ type QueryFiltersCookie struct {
 // QueryFilters sends a checked request.
 // If an error occurs, it will be returned with the reply by calling QueryFiltersCookie.Reply()
 func QueryFilters(c *xgb.Conn, Drawable xproto.Drawable) QueryFiltersCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'QueryFilters' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(queryFiltersRequest(c, Drawable), cookie)
 	return QueryFiltersCookie{cookie}
@@ -3132,6 +3273,9 @@ func QueryFilters(c *xgb.Conn, Drawable xproto.Drawable) QueryFiltersCookie {
 // QueryFiltersUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func QueryFiltersUnchecked(c *xgb.Conn, Drawable xproto.Drawable) QueryFiltersCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'QueryFilters' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(queryFiltersRequest(c, Drawable), cookie)
 	return QueryFiltersCookie{cookie}
@@ -3225,6 +3369,9 @@ type SetPictureFilterCookie struct {
 // SetPictureFilter sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func SetPictureFilter(c *xgb.Conn, Picture Picture, FilterLen uint16, Filter string, Values []Fixed) SetPictureFilterCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'SetPictureFilter' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(setPictureFilterRequest(c, Picture, FilterLen, Filter, Values), cookie)
 	return SetPictureFilterCookie{cookie}
@@ -3233,6 +3380,9 @@ func SetPictureFilter(c *xgb.Conn, Picture Picture, FilterLen uint16, Filter str
 // SetPictureFilterChecked sends a checked request.
 // If an error occurs, it can be retrieved using SetPictureFilterCookie.Check()
 func SetPictureFilterChecked(c *xgb.Conn, Picture Picture, FilterLen uint16, Filter string, Values []Fixed) SetPictureFilterCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'SetPictureFilter' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(setPictureFilterRequest(c, Picture, FilterLen, Filter, Values), cookie)
 	return SetPictureFilterCookie{cookie}
@@ -3288,6 +3438,9 @@ type CreateAnimCursorCookie struct {
 // CreateAnimCursor sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateAnimCursor(c *xgb.Conn, Cid xproto.Cursor, Cursors []Animcursorelt) CreateAnimCursorCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateAnimCursor' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createAnimCursorRequest(c, Cid, Cursors), cookie)
 	return CreateAnimCursorCookie{cookie}
@@ -3296,6 +3449,9 @@ func CreateAnimCursor(c *xgb.Conn, Cid xproto.Cursor, Cursors []Animcursorelt) C
 // CreateAnimCursorChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateAnimCursorCookie.Check()
 func CreateAnimCursorChecked(c *xgb.Conn, Cid xproto.Cursor, Cursors []Animcursorelt) CreateAnimCursorCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateAnimCursor' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createAnimCursorRequest(c, Cid, Cursors), cookie)
 	return CreateAnimCursorCookie{cookie}
@@ -3339,6 +3495,9 @@ type AddTrapsCookie struct {
 // AddTraps sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func AddTraps(c *xgb.Conn, Picture Picture, XOff int16, YOff int16, Traps []Trap) AddTrapsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'AddTraps' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(addTrapsRequest(c, Picture, XOff, YOff, Traps), cookie)
 	return AddTrapsCookie{cookie}
@@ -3347,6 +3506,9 @@ func AddTraps(c *xgb.Conn, Picture Picture, XOff int16, YOff int16, Traps []Trap
 // AddTrapsChecked sends a checked request.
 // If an error occurs, it can be retrieved using AddTrapsCookie.Check()
 func AddTrapsChecked(c *xgb.Conn, Picture Picture, XOff int16, YOff int16, Traps []Trap) AddTrapsCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'AddTraps' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(addTrapsRequest(c, Picture, XOff, YOff, Traps), cookie)
 	return AddTrapsCookie{cookie}
@@ -3396,6 +3558,9 @@ type CreateSolidFillCookie struct {
 // CreateSolidFill sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateSolidFill(c *xgb.Conn, Picture Picture, Color Color) CreateSolidFillCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateSolidFill' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createSolidFillRequest(c, Picture, Color), cookie)
 	return CreateSolidFillCookie{cookie}
@@ -3404,6 +3569,9 @@ func CreateSolidFill(c *xgb.Conn, Picture Picture, Color Color) CreateSolidFillC
 // CreateSolidFillChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateSolidFillCookie.Check()
 func CreateSolidFillChecked(c *xgb.Conn, Picture Picture, Color Color) CreateSolidFillCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateSolidFill' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createSolidFillRequest(c, Picture, Color), cookie)
 	return CreateSolidFillCookie{cookie}
@@ -3451,6 +3619,9 @@ type CreateLinearGradientCookie struct {
 // CreateLinearGradient sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateLinearGradient(c *xgb.Conn, Picture Picture, P1 Pointfix, P2 Pointfix, NumStops uint32, Stops []Fixed, Colors []Color) CreateLinearGradientCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateLinearGradient' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createLinearGradientRequest(c, Picture, P1, P2, NumStops, Stops, Colors), cookie)
 	return CreateLinearGradientCookie{cookie}
@@ -3459,6 +3630,9 @@ func CreateLinearGradient(c *xgb.Conn, Picture Picture, P1 Pointfix, P2 Pointfix
 // CreateLinearGradientChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateLinearGradientCookie.Check()
 func CreateLinearGradientChecked(c *xgb.Conn, Picture Picture, P1 Pointfix, P2 Pointfix, NumStops uint32, Stops []Fixed, Colors []Color) CreateLinearGradientCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateLinearGradient' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createLinearGradientRequest(c, Picture, P1, P2, NumStops, Stops, Colors), cookie)
 	return CreateLinearGradientCookie{cookie}
@@ -3523,6 +3697,9 @@ type CreateRadialGradientCookie struct {
 // CreateRadialGradient sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateRadialGradient(c *xgb.Conn, Picture Picture, Inner Pointfix, Outer Pointfix, InnerRadius Fixed, OuterRadius Fixed, NumStops uint32, Stops []Fixed, Colors []Color) CreateRadialGradientCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateRadialGradient' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createRadialGradientRequest(c, Picture, Inner, Outer, InnerRadius, OuterRadius, NumStops, Stops, Colors), cookie)
 	return CreateRadialGradientCookie{cookie}
@@ -3531,6 +3708,9 @@ func CreateRadialGradient(c *xgb.Conn, Picture Picture, Inner Pointfix, Outer Po
 // CreateRadialGradientChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateRadialGradientCookie.Check()
 func CreateRadialGradientChecked(c *xgb.Conn, Picture Picture, Inner Pointfix, Outer Pointfix, InnerRadius Fixed, OuterRadius Fixed, NumStops uint32, Stops []Fixed, Colors []Color) CreateRadialGradientCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateRadialGradient' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createRadialGradientRequest(c, Picture, Inner, Outer, InnerRadius, OuterRadius, NumStops, Stops, Colors), cookie)
 	return CreateRadialGradientCookie{cookie}
@@ -3601,6 +3781,9 @@ type CreateConicalGradientCookie struct {
 // CreateConicalGradient sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateConicalGradient(c *xgb.Conn, Picture Picture, Center Pointfix, Angle Fixed, NumStops uint32, Stops []Fixed, Colors []Color) CreateConicalGradientCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateConicalGradient' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createConicalGradientRequest(c, Picture, Center, Angle, NumStops, Stops, Colors), cookie)
 	return CreateConicalGradientCookie{cookie}
@@ -3609,6 +3792,9 @@ func CreateConicalGradient(c *xgb.Conn, Picture Picture, Center Pointfix, Angle
 // CreateConicalGradientChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateConicalGradientCookie.Check()
 func CreateConicalGradientChecked(c *xgb.Conn, Picture Picture, Center Pointfix, Angle Fixed, NumStops uint32, Stops []Fixed, Colors []Color) CreateConicalGradientCookie {
+	if _, ok := c.Extensions["RENDER"]; !ok {
+		panic("Cannot issue request 'CreateConicalGradient' using the uninitialized extension 'RENDER'. render.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createConicalGradientRequest(c, Picture, Center, Angle, NumStops, Stops, Colors), cookie)
 	return CreateConicalGradientCookie{cookie}