| // Copyright (C) 2015 The Android Open Source Project |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package gfxapi |
| |
| import ( |
| "fmt" |
| |
| "android.googlesource.com/platform/tools/gpu/binary" |
| ) |
| |
| // FramebufferAttachment values indicate the type of frame buffer attachment. |
| type FramebufferAttachment uint32 |
| |
| const ( |
| FramebufferAttachmentColor FramebufferAttachment = iota |
| FramebufferAttachmentDepth |
| FramebufferAttachmentStencil |
| ) |
| |
| // API is the common interface to a graphics programming api. |
| type API interface { |
| // Name returns the official name of the api. |
| Name() string |
| |
| // ID returns the unique API identifier. |
| ID() ID |
| |
| // GetFramebufferAttachmentSize returns the width and height of the framebuffer at the given attachment. |
| GetFramebufferAttachmentSize(state *State, attachment FramebufferAttachment) (width uint32, height uint32, err error) |
| } |
| |
| // ID is an API identifier |
| type ID binary.ID |
| |
| // Valid returns true if the id is not the default zero value. |
| func (i ID) Valid() bool { return binary.ID(i).Valid() } |
| |
| var apis map[ID]API = make(map[ID]API) |
| |
| // Register adds an api to the understood set. |
| // It is illegal to register the same name twice. |
| func Register(api API) { |
| id := api.ID() |
| if _, present := apis[id]; present { |
| panic(fmt.Errorf("API %s registered more than once", id)) |
| } |
| apis[id] = api |
| } |
| |
| // Find looks up a graphics API by identifier. |
| // If the id has not been registered, it returns nil. |
| func Find(id ID) API { |
| return apis[id] |
| } |