mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 21:32:20 +02:00
80 lines
1.6 KiB
Go
80 lines
1.6 KiB
Go
package graphics
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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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"unsafe"
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)
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func Clp2(x uint64) uint64 {
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x -= 1
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x |= (x >> 1)
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x |= (x >> 2)
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x |= (x >> 4)
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x |= (x >> 8)
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x |= (x >> 16)
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x |= (x >> 32)
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return x + 1
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}
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type Texture struct {
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id C.GLuint
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Width int
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Height int
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TextureWidth int
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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 {
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if width != textureWidth {
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panic("sorry, but width should be power of 2")
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}
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if height != textureHeight {
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panic("sorry, but height should be power of 2")
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}
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}
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texture := &Texture{
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id: 0,
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Width: width,
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Height: height,
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TextureWidth: textureWidth,
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TextureHeight: textureHeight,
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}
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device.executeWhenDrawing(func() {
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textureID := C.GLuint(0)
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C.glGenTextures(1, (*C.GLuint)(&textureID))
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if textureID == 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(textureID))
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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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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MAG_FILTER, C.GL_LINEAR)
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C.glTexParameteri(C.GL_TEXTURE_2D, C.GL_TEXTURE_MIN_FILTER, C.GL_LINEAR)
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C.glBindTexture(C.GL_TEXTURE_2D, 0)
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// TODO: lock?
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texture.id = textureID
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})
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return texture
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}
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func (texture *Texture) IsAvailable() bool {
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return texture.id != 0
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}
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