func (c *Context) NewTexture(width, height int, pixels []uint8, filter Filter) (Texture, error) {
var texture Texture
if err := c.runOnContextThread(func() error {
var t uint32
gl.GenTextures(1, &t)
// TODO: Use gl.IsTexture
if t <= 0 {
return errors.New("opengl: creating texture failed")
}
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
texture = Texture(t)
return nil
}); err != nil {
return 0, err
}
if err := c.BindTexture(texture); err != nil {
return 0, err
}
if err := c.runOnContextThread(func() error {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int32(filter))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int32(filter))
var p interface{}
if pixels != nil {
p = pixels
}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(width), int32(height), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(p))
return nil
}); err != nil {
return 0, err
}
return texture, nil
}
func (c *Context) NewTexture(width, height int, pixels []uint8, filter Filter) (Texture, error) {
var t uint32
gl.GenTextures(1, &t)
if t < 0 {
return 0, errors.New("glGenTexture failed")
}
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
gl.BindTexture(gl.TEXTURE_2D, t)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, int32(filter))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, int32(filter))
var p interface{}
if pixels != nil {
p = pixels
}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(width), int32(height), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Ptr(p))
return Texture(t), nil
}
// PixelStorei sets pixel storage parameters.
//
// http://www.khronos.org/opengles/sdk/docs/man3/html/glPixelStorei.xhtml
func PixelStorei(pname Enum, param int32) {
gl.PixelStorei(uint32(pname), param)
}
func (stash *Stash) GetGlyph(fnt *Font, codepoint int, isize int16) *Glyph {
size := float64(isize) / 10
// Find code point and size.
h := hashint(uint(codepoint)) & (HASH_LUT_SIZE - 1)
for i := fnt.lut[h]; i != -1; i = fnt.glyphs[i].next {
if fnt.glyphs[i].codepoint == codepoint && (fnt.fType == BMFONT || fnt.glyphs[i].size == isize) {
return fnt.glyphs[i]
}
}
// Could not find glyph.
// For bitmap fonts: ignore this glyph.
if fnt.fType == BMFONT {
return nil
}
// For truetype fonts: create this glyph.
scale := fnt.font.ScaleForPixelHeight(size)
g := fnt.font.FindGlyphIndex(codepoint)
if g == 0 {
// glyph not found
return nil
}
advance, _ := fnt.font.GetGlyphHMetrics(g)
x0, y0, x1, y1 := fnt.font.GetGlyphBitmapBox(g, scale, scale)
gw := x1 - x0
gh := y1 - y0
// Check if glyph is larger than maximum texture size
if gw >= stash.tw || gh >= stash.th {
return nil
}
// Find texture and row where the glyph can be fit.
rh := (int16(gh) + 7) & ^7
var tt int
texture := stash.ttTextures[tt]
var br *Row
for br == nil {
for i := range texture.rows {
if texture.rows[i].h == rh && int(texture.rows[i].x)+gw+1 <= stash.tw {
br = texture.rows[i]
}
}
// If no row is found, there are 3 possibilities:
// - add new row
// - try next texture
// - create new texture
if br == nil {
var py int16
// Check that there is enough space.
if len(texture.rows) > 0 {
py = texture.rows[len(texture.rows)-1].y + texture.rows[len(texture.rows)-1].h + 1
if int(py+rh) > stash.th {
if tt < len(stash.ttTextures)-1 {
tt++
texture = stash.ttTextures[tt]
} else {
// Create new texture
gl.Enable(gl.TEXTURE_2D)
texture = &Texture{}
gl.GenTextures(1, &texture.id)
gl.BindTexture(gl.TEXTURE_2D, texture.id)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.ALPHA,
int32(stash.tw), int32(stash.th), 0,
gl.ALPHA, gl.UNSIGNED_BYTE,
unsafe.Pointer(&stash.emptyData[0]))
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
gl.Disable(gl.TEXTURE_2D)
stash.ttTextures = append(stash.ttTextures, texture)
}
continue
}
}
// Init and add row
br = &Row{
x: 0,
y: py,
h: rh,
}
texture.rows = append(texture.rows, br)
}
}
// Init glyph.
glyph := &Glyph{
codepoint: codepoint,
size: isize,
texture: texture,
x0: int(br.x),
y0: int(br.y),
x1: int(br.x) + gw,
y1: int(br.y) + gh,
xadv: scale * float64(advance),
xoff: float64(x0),
yoff: float64(y0),
next: 0,
}
fnt.glyphs = append(fnt.glyphs, glyph)
// Advance row location.
br.x += int16(gw) + 1
// Insert char to hash lookup.
glyph.next = fnt.lut[h]
fnt.lut[h] = len(fnt.glyphs) - 1
// Rasterize
bmp := make([]byte, gw*gh)
bmp = fnt.font.MakeGlyphBitmap(bmp, gw, gh, gw, scale, scale, g)
if len(bmp) > 0 {
gl.Enable(gl.TEXTURE_2D)
// Update texture
gl.BindTexture(gl.TEXTURE_2D, texture.id)
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 1)
gl.TexSubImage2D(gl.TEXTURE_2D, 0, int32(glyph.x0), int32(glyph.y0),
int32(gw), int32(gh), gl.ALPHA, gl.UNSIGNED_BYTE,
unsafe.Pointer(&bmp[0]))
gl.Disable(gl.TEXTURE_2D)
}
return glyph
}