func (p *glParams) renderUpdateTexture(image, x, y, w, h int, data []byte) error {
tex := p.context.findTexture(image)
if tex == nil {
return errors.New("invalid texture in GLParams.updateTexture")
}
p.context.bindTexture(&tex.tex)
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 1)
if tex.texType == nvgTextureRGBA {
data = data[y*tex.width*4:]
} else {
data = data[y*tex.width:]
}
x = 0
w = tex.width
if tex.texType == nvgTextureRGBA {
gl.TexSubImage2D(gl.TEXTURE_2D, 0, x, y, w, h, gl.RGBA, gl.UNSIGNED_BYTE, data)
} else {
gl.TexSubImage2D(gl.TEXTURE_2D, 0, x, y, w, h, gl.LUMINANCE, gl.UNSIGNED_BYTE, data)
}
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
p.context.bindTexture(nil)
return nil
}
func (p *glParams) renderCreateTexture(texType nvgTextureType, w, h int, flags ImageFlags, data []byte) int {
if nearestPow2(w) != w || nearestPow2(h) != h {
if (flags&ImageRepeatX) != 0 || (flags&ImageRepeatY) != 0 {
dumpLog("Repeat X/Y is not supported for non power-of-two textures (%d x %d)\n", w, h)
flags &= ^(ImageRepeatY | ImageRepeatX)
}
if (flags & ImageGenerateMipmaps) != 0 {
dumpLog("Mip-maps is not support for non power-of-two textures (%d x %d)\n", w, h)
flags &= ^ImageGenerateMipmaps
}
}
tex := p.context.allocTexture()
tex.tex = gl.CreateTexture()
tex.width = w
tex.height = h
tex.texType = texType
tex.flags = flags
p.context.bindTexture(&tex.tex)
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 1)
if texType == nvgTextureRGBA {
data = prepareTextureBuffer(data, w, h, 4)
gl.TexImage2D(gl.TEXTURE_2D, 0, w, h, gl.RGBA, gl.UNSIGNED_BYTE, data)
} else {
data = prepareTextureBuffer(data, w, h, 1)
gl.TexImage2D(gl.TEXTURE_2D, 0, w, h, gl.LUMINANCE, gl.UNSIGNED_BYTE, data)
}
if (flags & ImageGenerateMipmaps) != 0 {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)
} else {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
}
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
if (flags & ImageRepeatX) != 0 {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.REPEAT)
} else {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE)
}
if (flags & ImageRepeatY) != 0 {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.REPEAT)
} else {
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE)
}
gl.PixelStorei(gl.UNPACK_ALIGNMENT, 4)
if (flags & ImageGenerateMipmaps) != 0 {
gl.GenerateMipmap(gl.TEXTURE_2D)
}
p.context.checkError("create tex")
p.context.bindTexture(&gl.Texture{})
return tex.id
}