mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
88 lines
2.1 KiB
Go
88 lines
2.1 KiB
Go
package texture
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// #cgo LDFLAGS: -framework OpenGL
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//
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// #include <OpenGL/gl.h>
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import "C"
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import (
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gtexture "github.com/hajimehoshi/go-ebiten/graphics/texture"
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"image"
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"unsafe"
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)
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type Native C.GLuint
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type Filter int
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const (
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FilterLinear = iota
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FilterNearest
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)
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func createNativeTexture(textureWidth, textureHeight int, pixels []uint8,
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filter Filter) Native {
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nativeTexture := C.GLuint(0)
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C.glGenTextures(1, (*C.GLuint)(&nativeTexture))
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if nativeTexture < 0 {
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panic("glGenTexture failed")
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}
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C.glPixelStorei(C.GL_UNPACK_ALIGNMENT, 4)
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C.glBindTexture(C.GL_TEXTURE_2D, C.GLuint(nativeTexture))
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defer C.glBindTexture(C.GL_TEXTURE_2D, 0)
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glFilter := C.GLint(0)
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switch filter {
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case FilterLinear:
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glFilter = C.GL_LINEAR
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case FilterNearest:
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glFilter = C.GL_NEAREST
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default:
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panic("not reached")
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}
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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, glFilter)
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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, glFilter)
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ptr := unsafe.Pointer(nil)
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if pixels != nil {
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ptr = unsafe.Pointer(&pixels[0])
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}
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C.glTexImage2D(C.GL_TEXTURE_2D, 0, C.GL_RGBA,
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C.GLsizei(textureWidth), C.GLsizei(textureHeight),
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0, C.GL_RGBA, C.GL_UNSIGNED_BYTE, ptr)
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return Native(nativeTexture)
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}
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func create(textureWidth, textureHeight int, filter Filter) (
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interface{}, error) {
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return createNativeTexture(textureWidth, textureHeight,
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nil, filter), nil
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}
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func createFromImage(img *image.NRGBA) (interface{}, error) {
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size := img.Bounds().Size()
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return createNativeTexture(size.X, size.Y, img.Pix, FilterLinear), nil
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}
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func New(width, height int, filter Filter) (*gtexture.Texture, error) {
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native, err := create(gtexture.AdjustSize(width), gtexture.AdjustSize(height), filter)
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if err != nil {
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return nil, err
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}
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return gtexture.New(native, width, height), nil
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}
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func NewEmpty(width, height int) (*gtexture.Texture, error) {
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return gtexture.New(nil, width, height), nil
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}
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func NewFromImage(img image.Image) (*gtexture.Texture, error) {
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native, err := createFromImage(gtexture.AdjustImage(img))
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if err != nil {
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return nil, err
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}
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size := img.Bounds().Size()
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return gtexture.New(native, size.X, size.Y), nil
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}
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