examples: remove example build tag (#2433)

Closes #1462

.builds/alpine.yml

@@ -14,4 +14,4 @@ sources:
 tasks:
   - build: |
       cd ebiten
-      go build -tags=example ./...
+      go build ./...

.builds/arch.yml

@@ -13,4 +13,4 @@ sources:
 tasks:
   - build: |
       cd ebiten
-      go build -tags=example ./...
+      go build ./...

.builds/fedora.yml

@@ -15,4 +15,4 @@ sources:
 tasks:
   - build: |
       cd ebiten
-      go build -tags=example ./...
+      go build ./...

.builds/freebsd.yml

@@ -13,4 +13,4 @@ sources:
 tasks:
   - build: |
       cd ebiten
-      go build -tags=example ./...
+      go build ./...

.builds/ubuntu.yml

@@ -16,4 +16,4 @@ sources:
 tasks:
   - build: |
       cd ebiten
-      go build -tags=example ./...
+      go build ./...

.github/workflows/steam.sh

@@ -10,4 +10,4 @@ rm -rf /usr/local/go && tar -C /usr/local -xzf ${GO_FILENAME}
 Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
 
 # Run the tests
-go test -tags=example -v ./...
+go test -v ./...

.github/workflows/test.yml

@@ -64,32 +64,32 @@ jobs:
 
       - name: go vet
         run: |
-          go list -tags=example ./... | grep -v -x -F -f .github/workflows/govetblock.txt | xargs go vet -tags=example
+          go list ./... | grep -v -x -F -f .github/workflows/govetblock.txt | xargs go vet
 
       - name: go vet (vettool)
         run: |
           (cd .github/workflows/vettools; go install .)
-          go vet -vettool=$(which vettools)${{ startsWith(matrix.os, 'windows-') && '.exe' || '' }} -tags=example -v ./...
+          go vet -vettool=$(which vettools)${{ startsWith(matrix.os, 'windows-') && '.exe' || '' }} -v ./...
 
       - name: go build
         run: |
-          go build -tags=example -v ./...
+          go build -v ./...
           # Compile without optimization to check potential stack overflow.
           # The option '-gcflags=all=-N -l' is often used at Visual Studio Code.
           # See also https://go.googlesource.com/vscode-go/+/HEAD/docs/debugging.md#launch and the issue #2120.
-          go build -tags=example "-gcflags=all=-N -l" -v ./...
-          env GOOS=js GOARCH=wasm go build -tags=example -v ./...
-          env GOOS=windows GOARCH=386 go build -tags=example -v ./...
-          env GOOS=windows GOARCH=amd64 go build -tags=example -v ./...
-          env GOOS=windows GOARCH=arm go build -tags=example -v ./...
-          env GOOS=windows GOARCH=arm64 go build -tags=example -v ./...
+          go build "-gcflags=all=-N -l" -v ./...
+          env GOOS=js GOARCH=wasm go build -v ./...
+          env GOOS=windows GOARCH=386 go build -v ./...
+          env GOOS=windows GOARCH=amd64 go build -v ./...
+          env GOOS=windows GOARCH=arm go build -v ./...
+          env GOOS=windows GOARCH=arm64 go build -v ./...
 
       - name: go build (macOS)
         if: ${{ startsWith(matrix.os, 'macos-') }}
         run: |
-          env CGO_ENABLED=1 GOOS=darwin GOARCH=arm64 go build -tags=example -v ./...
-          env CGO_ENABLED=1 GOOS=darwin GOARCH=amd64 go build -tags=example -o flappy_amd64 -v ./examples/flappy
-          env CGO_ENABLED=1 GOOS=darwin GOARCH=arm64 go build -tags=example -o flappy_arm64 -v ./examples/flappy
+          env CGO_ENABLED=1 GOOS=darwin GOARCH=arm64 go build -v ./...
+          env CGO_ENABLED=1 GOOS=darwin GOARCH=amd64 go build -o flappy_amd64 -v ./examples/flappy
+          env CGO_ENABLED=1 GOOS=darwin GOARCH=arm64 go build -o flappy_arm64 -v ./examples/flappy
           lipo -create flappy_amd64 flappy_arm64 -output flappy
           file flappy
           rm flappy
@@ -97,8 +97,8 @@ jobs:
       - name: go build (NintendoSDK)
         if: ${{ startsWith(matrix.os, 'ubuntu-') }}
         run: |
-          go build -tags=example,nintendosdk -v ./...
-          go build -tags=example,ebitencbackend -v ./... # For backward compatibility. Remove this in the future (#2190).
+          go build -tags=nintendosdk -v ./...
+          go build -tags=ebitencbackend -v ./... # For backward compatibility. Remove this in the future (#2190).
 
       - name: go mod vendor
         run: |
@@ -121,7 +121,7 @@ jobs:
         # TODO: Add more test environments (#1305)
         if: ${{ startsWith(matrix.os, 'ubuntu-') || startsWith(matrix.os, 'windows-') }}
         run: |
-          go test -tags=example -shuffle=on -v ./...
+          go test -shuffle=on -v ./...
 
       - name: go test (Linux 386)
         if: ${{ startsWith(matrix.os, 'ubuntu-') }}
@@ -130,23 +130,23 @@ jobs:
           sudo apt-get update
           sudo apt-get install gcc-multilib
           sudo apt-get install libasound2-dev:i386 libgl1-mesa-dev:i386 libxcursor-dev:i386 libxi-dev:i386 libxinerama-dev:i386 libxrandr-dev:i386 libxxf86vm-dev:i386
-          env CGO_ENABLED=1 GOARCH=386 go test -tags=example -shuffle=on -v ./...
+          env CGO_ENABLED=1 GOARCH=386 go test -shuffle=on -v ./...
 
       - name: go test (Linux OpenGL ES)
         if: ${{ startsWith(matrix.os, 'ubuntu-') }}
         run: |
           sudo apt-get install libgles2-mesa-dev
-          env EBITENGINE_GRAPHICS_LIBRARY=opengl go test -tags=example,opengles -shuffle=on -v ./...
+          env EBITENGINE_GRAPHICS_LIBRARY=opengl go test -tags=opengles -shuffle=on -v ./...
 
       - name: go test (Windows 386)
         if: ${{ startsWith(matrix.os, 'windows-') }}
         run: |
-          env GOARCH=386 go test -tags=example -shuffle=on -v ./...
+          env GOARCH=386 go test -shuffle=on -v ./...
 
       - name: go test (Wasm)
         run: |
-          env GOOS=js GOARCH=wasm go test -tags=example -shuffle=on -v ./...
-          env GOOS=js GOARCH=wasm EBITENGINE_OPENGL=webgl1 go test -tags=example -shuffle=on -v ./...
+          env GOOS=js GOARCH=wasm go test -shuffle=on -v ./...
+          env GOOS=js GOARCH=wasm EBITENGINE_OPENGL=webgl1 go test -shuffle=on -v ./...
 
       - name: Install ebitenmobile
         run: |

.github/workflows/vuln.yml

@@ -43,5 +43,5 @@ jobs:
 
       - name: govulncheck
         run: |
-          govulncheck -tags=example ./...
-          env GOOS=js GOARCH=wasm govulncheck -tags=example ./...
+          govulncheck ./...
+          env GOOS=js GOARCH=wasm govulncheck ./...

CONTRIBUTING.md

@@ -45,14 +45,6 @@ For example, formatting by `go fmt` is required.
 
 You don't have to update existing files' license comments.
 
-## Adding build tags for examples
-
-```go
-//go:build example
-```
-
-`example` is to prevent from installing executions by `go get github.com/hajimehoshi/ebiten/v2/...`.
-
 ## Implementation details
 
 See the [documents](https://ebitengine.org/en/documents/implementation.html) about internal implementation.

examples/2048/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/README.md

@@ -3,7 +3,7 @@
 ## Desktops
 
 ```sh
-go run -tags=example github.com/hajimehoshi/ebiten/v2/examples/rotate
+go run github.com/hajimehoshi/ebiten/v2/examples/rotate@latest
 ```
 
 ## Android
@@ -11,13 +11,13 @@ go run -tags=example github.com/hajimehoshi/ebiten/v2/examples/rotate
 Install [gomobile](https://pkg.go.dev/golang.org/x/mobile/cmd/gomobile) first.
 
 ```sh
-gomobile install -tags=example github.com/hajimehoshi/ebiten/v2/examples/rotate
+gomobile install github.com/hajimehoshi/ebiten/v2/examples/rotate@latest
 ```
 
 ## iOS
 
 ```sh
-gomobile build -target=ios -tags=example -work github.com/hajimehoshi/ebiten/v2/examples/rotate
+gomobile build -target=ios -work github.com/hajimehoshi/ebiten/v2/examples/rotate@latest
 ```
 
 Then, open the `WORK` directory, open `main.xcodeproj`, add signing, and run the project.

examples/additive/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/address/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/airship/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/alphablending/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/animation/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/audio/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 // This is an example to implement an audio player.
 // See examples/wav for a simpler example to play a sound file.
 

examples/audioinfiniteloop/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/audiopanning/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/blocks/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/blur/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/camera/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/chipmunk/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/clip/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/contextlost/context_js.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/contextlost/context_notjs.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example && !js
+//go:build !js
 
 package main
 

examples/contextlost/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/cursor/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/doomfire/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/drag/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/filter/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/flappy/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/flappy/main_c.go

@@ -12,7 +12,7 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example && (microsoftgdk || nintendosdk)
+//go:build microsoftgdk || nintendosdk
 
 // This file is for some special environments using 'microsoftgdk' or 'nintendosdk'.
 // You usually don't have to care about this file.

examples/flood/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/font/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/fullscreen/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/gamepad/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/highdpi/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/hsv/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/hue/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/infinitescroll/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/isometric/game.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/isometric/level.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/isometric/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/isometric/spritesheet.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/isometric/tile.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/keyboard/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/lasttouch/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/life/main.go

@@ -21,8 +21,6 @@
 // FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 // DEALINGS IN THE SOFTWARE.
 
-//go:build example
-
 package main
 
 import (

examples/mandelbrot/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/mascot/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 // Mascot is a desktop mascot on cross platforms.
 // This is inspired by mattn's gopher (https://github.com/mattn/gopher).
 package main

examples/masking/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/minify/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 // This example is an experiment to minify images with various filters.
 // When linear filter is used, mipmap images should be used for high-quality rendering (#578).
 

examples/moire/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 // This example is just to check if Ebitengine can draw fine checker pattern evenly.
 // If there is something wrong in the implementation, the result might include
 // uneven patterns (#459).

examples/mosaic/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/noise/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/paint/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/particles/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/pcm/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/perspective/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/piano/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/platformer/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/polygons/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/raycasting/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/realtimepcm/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/rotate/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/set/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/shader/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/shapes/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/sinewave/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/skipdraw/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/snake/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/sprites/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/spriteshd/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/squiral/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 // This demo is inspired by the xscreensaver 'squirals'.
 
 package main

examples/stars/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/text/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/tiles/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/touch/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/typewriter/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/ui/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/vector/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/vibrate/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/wav/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/wheel/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/windowclosing/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (

examples/windowsize/main.go

@@ -12,8 +12,6 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-//go:build example
-
 package main
 
 import (