ebiten/graphics/opengl/texture.go

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package opengl
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// #cgo LDFLAGS: -framework OpenGL
//
// #include <OpenGL/gl.h>
import "C"
import (
"unsafe"
)
func Clp2(x uint64) uint64 {
x -= 1
x |= (x >> 1)
x |= (x >> 2)
x |= (x >> 4)
x |= (x >> 8)
x |= (x >> 16)
x |= (x >> 32)
return x + 1
}
type Texture struct {
id C.GLuint
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width int
height int
textureWidth int
textureHeight int
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}
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func createTexture(device *Device, width, height int, pixels []uint8) *Texture{
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textureWidth := int(Clp2(uint64(width)))
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textureHeight := int(Clp2(uint64(height)))
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if pixels != nil {
if width != textureWidth {
panic("sorry, but width should be power of 2")
}
if height != textureHeight {
panic("sorry, but height should be power of 2")
}
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}
texture := &Texture{
id: 0,
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width: width,
height: height,
textureWidth: textureWidth,
textureHeight: textureHeight,
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}
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device.executeWhenDrawing(func() {
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textureID := C.GLuint(0)
C.glGenTextures(1, (*C.GLuint)(&textureID))
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if textureID == 0 {
panic("glGenTexture failed")
}
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C.glPixelStorei(C.GL_UNPACK_ALIGNMENT, 4)
C.glBindTexture(C.GL_TEXTURE_2D, C.GLuint(textureID))
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)
C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, C.GL_LINEAR)
C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, C.GL_LINEAR)
C.glBindTexture(C.GL_TEXTURE_2D, 0)
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// TODO: lock?
texture.id = textureID
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})
return texture
}
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func (texture *Texture) Width() int {
return texture.width
}
func (texture *Texture) Height() int {
return texture.height
}
func (texture *Texture) TextureWidth() int {
return texture.textureWidth
}
func (texture *Texture) TextureHeight() int {
return texture.textureHeight
}
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func (texture *Texture) IsAvailable() bool {
return texture.id != 0
}