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use go:embed for example image
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@JupiterRider
JupiterRider committed Oct 30, 2024
1 parent 21e556e commit c2b54f5
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4 changes: 2 additions & 2 deletions examples/structs/raylib/README.md
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
This example shows how to work with structs. It uses the [raylib](https://github.com/raysan5/raylib) library to open a window and display an image.

Run it from the root directory like this:
You can run it like this:
```sh
go run examples/structs/raylib/main.go
go run github.com/jupiterrider/ffi/examples/structs/raylib@latest
```

![Screenshot](./Screenshot.png)
83 changes: 66 additions & 17 deletions examples/structs/raylib/main_unix.go
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,8 @@ import (
"runtime"
"unsafe"

_ "embed"

"github.com/ebitengine/purego"
"github.com/jupiterrider/ffi"
)
Expand All @@ -16,21 +18,32 @@ type Texture struct {
Width, Height, Mipmaps, Format int32
}

type Image struct {
Data unsafe.Pointer
Width, Height, Mipmaps, Format int32
}

//go:embed gopher-with-C-book.png
var gopher []byte

var (
TypeImage = ffi.Type{Type: ffi.Struct, Elements: &[]*ffi.Type{&ffi.TypePointer, &ffi.TypeSint32, &ffi.TypeSint32, &ffi.TypeSint32, &ffi.TypeSint32, nil}[0]}
TypeTexture = ffi.Type{Type: ffi.Struct, Elements: &[]*ffi.Type{&ffi.TypeUint32, &ffi.TypeSint32, &ffi.TypeSint32, &ffi.TypeSint32, &ffi.TypeSint32, nil}[0]}
TypeColor = ffi.Type{Type: ffi.Struct, Elements: &[]*ffi.Type{&ffi.TypeUint8, &ffi.TypeUint8, &ffi.TypeUint8, &ffi.TypeUint8, nil}[0]}
)

var (
InitWindow func(width, height int32, title string)
CloseWindow func()
WindowShouldClose func() bool
BeginDrawing func()
EndDrawing func()
ClearBackground func(col color.RGBA)
LoadTexture func(filename string) Texture
UnloadTexture func(texture Texture)
DrawTexture func(texture Texture, posX, posY int32, col color.RGBA)
InitWindow func(width, height int32, title string)
CloseWindow func()
WindowShouldClose func() bool
BeginDrawing func()
EndDrawing func()
ClearBackground func(col color.RGBA)
LoadImageFromMemory func(fileType string, fileData []byte) Image
LoadTextureFromImage func(img Image) Texture
UnloadImage func(img Image)
UnloadTexture func(texture Texture)
DrawTexture func(texture Texture, posX, posY int32, col color.RGBA)
)

func init() {
Expand Down Expand Up @@ -124,24 +137,58 @@ func init() {
ffi.Call(&cifClearBackground, symClearBackground, nil, unsafe.Pointer(&col))
}

// LoadTexture ------------------------------
var cifLoadTexture ffi.Cif
if status := ffi.PrepCif(&cifLoadTexture, ffi.DefaultAbi, 1, &TypeTexture, &ffi.TypePointer); status != ffi.OK {
// LoadImageFromMemory ----------------------
var cifLoadImageFromMemory ffi.Cif
if status := ffi.PrepCif(&cifLoadImageFromMemory, ffi.DefaultAbi, 3, &TypeImage, &ffi.TypePointer, &ffi.TypePointer, &ffi.TypeSint32); status != ffi.OK {
panic(status)
}

symLoadTexture, err := purego.Dlsym(raylib, "LoadTexture")
symLoadImageFromMemory, err := purego.Dlsym(raylib, "LoadImageFromMemory")
if err != nil {
panic(err)
}

LoadTexture = func(filename string) Texture {
byteFilename := &[]byte(filename + "\x00")[0] // you can also use golang.org/x/sys/unix.BytePtrFromString to create a null-terminated string
LoadImageFromMemory = func(fileType string, fileData []byte) Image {
byteFileType := &[]byte(fileType + "\x00")[0]
ptrFileData := &fileData[0]
dataSize := int32(len(fileData))
var img Image
ffi.Call(&cifLoadImageFromMemory, symLoadImageFromMemory, unsafe.Pointer(&img), unsafe.Pointer(&byteFileType), unsafe.Pointer(&ptrFileData), unsafe.Pointer(&dataSize))
return img
}

// LoadTextureFromImage ---------------------
var cifLoadTextureFromImage ffi.Cif
if status := ffi.PrepCif(&cifLoadTextureFromImage, ffi.DefaultAbi, 1, &TypeTexture, &TypeImage); status != ffi.OK {
panic(status)
}

symLoadTextureFromImage, err := purego.Dlsym(raylib, "LoadTextureFromImage")
if err != nil {
panic(err)
}

LoadTextureFromImage = func(img Image) Texture {
var texture Texture
ffi.Call(&cifLoadTexture, symLoadTexture, unsafe.Pointer(&texture), unsafe.Pointer(&byteFilename))
ffi.Call(&cifLoadTextureFromImage, symLoadTextureFromImage, unsafe.Pointer(&texture), unsafe.Pointer(&img))
return texture
}

// UnloadImage ----------------------------
var cifUnloadImage ffi.Cif
if status := ffi.PrepCif(&cifUnloadImage, ffi.DefaultAbi, 1, &ffi.TypeVoid, &TypeImage); status != ffi.OK {
panic(status)
}

symUnloadImage, err := purego.Dlsym(raylib, "UnloadImage")
if err != nil {
panic(err)
}

UnloadImage = func(img Image) {
ffi.Call(&cifUnloadImage, symUnloadImage, nil, unsafe.Pointer(&img))
}

// UnloadTexture ----------------------------
var cifUnloadTexture ffi.Cif
if status := ffi.PrepCif(&cifUnloadTexture, ffi.DefaultAbi, 1, &ffi.TypeVoid, &TypeTexture); status != ffi.OK {
Expand Down Expand Up @@ -181,8 +228,10 @@ func main() {
InitWindow(width, height, "raylib ffi example")
defer CloseWindow()

texture := LoadTexture("examples/structs/raylib/gopher-with-C-book.png")
img := LoadImageFromMemory(".png", gopher)
texture := LoadTextureFromImage(img)
defer UnloadTexture(texture)
UnloadImage(img)

for !WindowShouldClose() {
BeginDrawing()
Expand Down
83 changes: 66 additions & 17 deletions examples/structs/raylib/main_windows.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,8 @@ import (
"syscall"
"unsafe"

_ "embed"

"github.com/jupiterrider/ffi"
)

Expand All @@ -17,21 +19,32 @@ type Texture struct {
Width, Height, Mipmaps, Format int32
}

type Image struct {
Data unsafe.Pointer
Width, Height, Mipmaps, Format int32
}

//go:embed gopher-with-C-book.png
var gopher []byte

var (
TypeImage = ffi.Type{Type: ffi.Struct, Elements: &[]*ffi.Type{&ffi.TypePointer, &ffi.TypeSint32, &ffi.TypeSint32, &ffi.TypeSint32, &ffi.TypeSint32, nil}[0]}
TypeTexture = ffi.Type{Type: ffi.Struct, Elements: &[]*ffi.Type{&ffi.TypeUint32, &ffi.TypeSint32, &ffi.TypeSint32, &ffi.TypeSint32, &ffi.TypeSint32, nil}[0]}
TypeColor = ffi.Type{Type: ffi.Struct, Elements: &[]*ffi.Type{&ffi.TypeUint8, &ffi.TypeUint8, &ffi.TypeUint8, &ffi.TypeUint8, nil}[0]}
)

var (
InitWindow func(width, height int32, title string)
CloseWindow func()
WindowShouldClose func() bool
BeginDrawing func()
EndDrawing func()
ClearBackground func(col color.RGBA)
LoadTexture func(filename string) Texture
UnloadTexture func(texture Texture)
DrawTexture func(texture Texture, posX, posY int32, col color.RGBA)
InitWindow func(width, height int32, title string)
CloseWindow func()
WindowShouldClose func() bool
BeginDrawing func()
EndDrawing func()
ClearBackground func(col color.RGBA)
LoadImageFromMemory func(fileType string, fileData []byte) Image
LoadTextureFromImage func(img Image) Texture
UnloadImage func(img Image)
UnloadTexture func(texture Texture)
DrawTexture func(texture Texture, posX, posY int32, col color.RGBA)
)

func init() {
Expand Down Expand Up @@ -126,24 +139,58 @@ func init() {
ffi.Call(&cifClearBackground, symClearBackground, nil, unsafe.Pointer(&col))
}

// LoadTexture ------------------------------
var cifLoadTexture ffi.Cif
if status := ffi.PrepCif(&cifLoadTexture, ffi.DefaultAbi, 1, &TypeTexture, &ffi.TypePointer); status != ffi.OK {
// LoadImageFromMemory ----------------------
var cifLoadImageFromMemory ffi.Cif
if status := ffi.PrepCif(&cifLoadImageFromMemory, ffi.DefaultAbi, 3, &TypeImage, &ffi.TypePointer, &ffi.TypePointer, &ffi.TypeSint32); status != ffi.OK {
panic(status)
}

symLoadTexture, err := syscall.GetProcAddress(raylib, "LoadTexture")
symLoadImageFromMemory, err := syscall.GetProcAddress(raylib, "LoadImageFromMemory")
if err != nil {
panic(err)
}

LoadTexture = func(filename string) Texture {
byteFilename := &[]byte(filename + "\x00")[0] // you can also use golang.org/x/sys/windows.BytePtrFromString to create a null-terminated string
LoadImageFromMemory = func(fileType string, fileData []byte) Image {
byteFileType := &[]byte(fileType + "\x00")[0]
ptrFileData := &fileData[0]
dataSize := int32(len(fileData))
var img Image
ffi.Call(&cifLoadImageFromMemory, symLoadImageFromMemory, unsafe.Pointer(&img), unsafe.Pointer(&byteFileType), unsafe.Pointer(&ptrFileData), unsafe.Pointer(&dataSize))
return img
}

// LoadTextureFromImage ---------------------
var cifLoadTextureFromImage ffi.Cif
if status := ffi.PrepCif(&cifLoadTextureFromImage, ffi.DefaultAbi, 1, &TypeTexture, &TypeImage); status != ffi.OK {
panic(status)
}

symLoadTextureFromImage, err := syscall.GetProcAddress(raylib, "LoadTextureFromImage")
if err != nil {
panic(err)
}

LoadTextureFromImage = func(img Image) Texture {
var texture Texture
ffi.Call(&cifLoadTexture, symLoadTexture, unsafe.Pointer(&texture), unsafe.Pointer(&byteFilename))
ffi.Call(&cifLoadTextureFromImage, symLoadTextureFromImage, unsafe.Pointer(&texture), unsafe.Pointer(&img))
return texture
}

// UnloadImage ----------------------------
var cifUnloadImage ffi.Cif
if status := ffi.PrepCif(&cifUnloadImage, ffi.DefaultAbi, 1, &ffi.TypeVoid, &TypeImage); status != ffi.OK {
panic(status)
}

symUnloadImage, err := syscall.GetProcAddress(raylib, "UnloadImage")
if err != nil {
panic(err)
}

UnloadImage = func(img Image) {
ffi.Call(&cifUnloadImage, symUnloadImage, nil, unsafe.Pointer(&img))
}

// UnloadTexture ----------------------------
var cifUnloadTexture ffi.Cif
if status := ffi.PrepCif(&cifUnloadTexture, ffi.DefaultAbi, 1, &ffi.TypeVoid, &TypeTexture); status != ffi.OK {
Expand Down Expand Up @@ -183,8 +230,10 @@ func main() {
InitWindow(width, height, "raylib ffi example")
defer CloseWindow()

texture := LoadTexture("examples/structs/raylib/gopher-with-C-book.png")
img := LoadImageFromMemory(".png", gopher)
texture := LoadTextureFromImage(img)
defer UnloadTexture(texture)
UnloadImage(img)

for !WindowShouldClose() {
BeginDrawing()
Expand Down

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