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extensions.go
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extensions.go
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package renderer
import "syscall/js"
type Extensions struct {
glContext js.Value
cache map[string]js.Value
}
func NewExtensions(glContext js.Value) *Extensions {
return &Extensions{
glContext: glContext,
cache: make(map[string]js.Value),
}
}
func (ext *Extensions) Get(name string) js.Value {
if value, ok := ext.cache[name]; ok {
return value
} else {
switch name {
case "WEBGL_depth_texture":
value := ext.glContext.Call("getExtension", "WEBGL_depth_texture")
if value == js.Undefined() {
value = ext.glContext.Call("getExtension", "MOZ_WEBGL_depth_texture")
}
if value == js.Undefined() {
value = ext.glContext.Call("getExtension", "WEBKIT_WEBGL_depth_texture")
}
ext.cache["WEBGL_depth_texture"] = value
return value
case "EXT_texture_filter_anisotropic":
value := ext.glContext.Call("getExtension", "EXT_texture_filter_anisotropic")
if value == js.Undefined() {
value = ext.glContext.Call("getExtension", "MOZ_EXT_texture_filter_anisotropic")
}
if value == js.Undefined() {
value = ext.glContext.Call("getExtension", "WEBKIT_EXT_texture_filter_anisotropic")
}
ext.cache["EXT_texture_filter_anisotropic"] = value
return value
case "WEBGL_compressed_texture_s3tc":
value := ext.glContext.Call("getExtension", "WEBGL_compressed_texture_s3tc")
if value == js.Undefined() {
value = ext.glContext.Call("getExtension", "MOZ_WEBGL_compressed_texture_s3tc")
}
if value == js.Undefined() {
value = ext.glContext.Call("getExtension", "WEBKIT_WEBGL_compressed_texture_s3tc")
}
ext.cache["WEBGL_compressed_texture_s3tc"] = value
return value
case "WEBGL_compressed_texture_pvrtc":
value := ext.glContext.Call("getExtension", "WEBGL_compressed_texture_pvrtc")
if value == js.Undefined() {
value = ext.glContext.Call("getExtension", "WEBKIT_WEBGL_compressed_texture_pvrtc")
}
ext.cache["WEBGL_compressed_texture_pvrtc"] = value
return value
default:
return ext.glContext.Call("getExtension", name)
}
}
}