func (m *Manager) LoadFromPath(path string) *Data {
setupTextureList()
m.mutex.RLock()
var data *Data
var ok bool
if data, ok = m.registry[path]; ok {
m.mutex.RUnlock()
m.mutex.Lock()
data.accessed = generation
m.mutex.Unlock()
return data
}
m.mutex.RUnlock()
m.mutex.Lock()
if data, ok = m.deleted[path]; ok {
delete(m.deleted, path)
} else {
data = &Data{}
}
data.accessed = generation
m.registry[path] = data
m.mutex.Unlock()
f, err := os.Open(path)
if err != nil {
base.Error().Printf("Unable to open %s: %v", path, err)
return data
}
config, _, err := image.DecodeConfig(f)
f.Close()
data.dx = config.Width
data.dy = config.Height
load_requests <- loadRequest{path, data}
return data
}
func handleLoadRequest(req loadRequest) {
f, _ := os.Open(req.path)
im, _, err := image.Decode(f)
f.Close()
if err != nil {
base.Error().Printf("Unable to open %s: %v", req.path, err)
return
}
gray := true
dx := im.Bounds().Dx()
dy := im.Bounds().Dy()
for i := 0; i < dx; i++ {
for j := 0; j < dy; j++ {
r, g, b, _ := im.At(i, j).RGBA()
if r != g || g != b {
gray = false
break
}
}
if !gray {
break
}
}
var canvas draw.Image
var pix []byte
base.Log().Printf("Is Gray: %t", gray)
if gray {
ga := NewGrayAlpha(im.Bounds())
pix = ga.Pix
canvas = ga
} else {
pix = memory.GetBlock(4 * req.data.dx * req.data.dy)
canvas = &image.RGBA{pix, 4 * req.data.dx, im.Bounds()}
}
draw.Draw(canvas, im.Bounds(), im, image.Point{}, draw.Src)
load_mutex.Lock()
load_count += len(pix)
manual_unlock := false
// This prevents us from trying to send too much to opengl in a single
// frame. If we go over the threshold then we hold the lock until we're
// done sending data to opengl, then other requests will be free to
// queue up and they will run on the next frame.
if load_count < load_threshold {
load_mutex.Unlock()
} else {
manual_unlock = true
}
render.Queue(func() {
{
gl.Enable(gl.TEXTURE_2D)
gl.GenTextures(1, (*gl.Uint)(&req.data.texture))
gl.BindTexture(gl.TEXTURE_2D, req.data.texture)
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 1)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
}
if gray {
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.ALPHA,
gl.Sizei(req.data.dx),
gl.Sizei(req.data.dy),
0,
gl.ALPHA,
gl.UNSIGNED_BYTE,
gl.Pointer(&pix[0]))
} else {
gl.TexImage2D(
gl.TEXTURE_2D,
0,
gl.RGBA,
gl.Sizei(req.data.dx),
gl.Sizei(req.data.dy),
0,
gl.RGBA,
gl.UNSIGNED_BYTE,
gl.Pointer(&pix[0]))
// gl.TexImage2D(target, level, internalformat, width, height, border, format, type_, pixels)
// glu.Build2DMipmaps(gl.TEXTURE_2D, gl.RGBA, req.data.dx, req.data.dy, gl.RGBA, pix)
}
memory.FreeBlock(pix)
if manual_unlock {
load_count = 0
load_mutex.Unlock()
}
})
}