mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 13:22:19 +02:00
83 lines
2.1 KiB
Go
83 lines
2.1 KiB
Go
package texture
|
|
|
|
// #cgo LDFLAGS: -framework OpenGL
|
|
//
|
|
// #include <OpenGL/gl.h>
|
|
import "C"
|
|
import (
|
|
gtexture "github.com/hajimehoshi/go-ebiten/graphics/texture"
|
|
"image"
|
|
"unsafe"
|
|
)
|
|
|
|
type Native C.GLuint
|
|
|
|
type Filter int
|
|
|
|
const (
|
|
FilterLinear = iota
|
|
FilterNearest
|
|
)
|
|
|
|
func createNativeTexture(textureWidth, textureHeight int, pixels []uint8,
|
|
filter Filter) Native {
|
|
nativeTexture := C.GLuint(0)
|
|
|
|
C.glGenTextures(1, (*C.GLuint)(&nativeTexture))
|
|
if nativeTexture < 0 {
|
|
panic("glGenTexture failed")
|
|
}
|
|
C.glPixelStorei(C.GL_UNPACK_ALIGNMENT, 4)
|
|
C.glBindTexture(C.GL_TEXTURE_2D, C.GLuint(nativeTexture))
|
|
defer C.glBindTexture(C.GL_TEXTURE_2D, 0)
|
|
|
|
glFilter := C.GLint(0)
|
|
switch filter {
|
|
case FilterLinear:
|
|
glFilter = C.GL_LINEAR
|
|
case FilterNearest:
|
|
glFilter = C.GL_NEAREST
|
|
default:
|
|
panic("not reached")
|
|
}
|
|
C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, glFilter)
|
|
C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, glFilter)
|
|
|
|
ptr := unsafe.Pointer(nil)
|
|
if pixels != nil {
|
|
ptr = unsafe.Pointer(&pixels[0])
|
|
}
|
|
C.glTexImage2D(C.GL_TEXTURE_2D, 0, C.GL_RGBA,
|
|
C.GLsizei(textureWidth), C.GLsizei(textureHeight),
|
|
0, C.GL_RGBA, C.GL_UNSIGNED_BYTE, ptr)
|
|
|
|
return Native(nativeTexture)
|
|
}
|
|
|
|
func create(textureWidth, textureHeight int, filter Filter) (interface{}, error) {
|
|
return createNativeTexture(textureWidth, textureHeight, nil, filter), nil
|
|
}
|
|
|
|
func createFromImage(img *image.NRGBA) (interface{}, error) {
|
|
size := img.Bounds().Size()
|
|
return createNativeTexture(size.X, size.Y, img.Pix, FilterLinear), nil
|
|
}
|
|
|
|
func New(width, height int, filter Filter) (*gtexture.Texture, error) {
|
|
f := func(textureWidth, textureHeight int) (interface{}, error) {
|
|
return create(textureWidth, textureHeight, filter)
|
|
}
|
|
return gtexture.New(width, height, f)
|
|
}
|
|
|
|
func NewEmpty(width, height int) (*gtexture.Texture, error) {
|
|
f := func(textureWidth, textureHeight int) (interface{}, error) {
|
|
return nil, nil
|
|
}
|
|
return gtexture.New(width, height, f)
|
|
}
|
|
|
|
func NewFromImage(img image.Image) (*gtexture.Texture, error) {
|
|
return gtexture.NewFromImage(img, createFromImage)
|
|
}
|