Go 中 SDL Surface 的 OpenGL 纹理

Question

I'm using go-sdl2 and go-gl and I'm trying to create a gl texture from sdl surface. In CI would do that by calling glTexImage2D with surface->pixels as the last argument. In go-sdl , however, pixels is a private field and Pixels() (that I'm supposed to use to access it) returns []byte , which is incompatible with gl.TexImage2D that expects the last argument to be an unsafe.Pointer .

image, err := img.Load("img.png")
if err != nil {
    //...
}
var texture uint32
gl.GenTextures(1, &texture)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, image.W, image.H, 0, gl.RGBA, gl.UNSIGNED_BYTE, image.Pixels())

cannot use image.Pixels() (value of type []byte) as type unsafe.Pointer in argument to gl.TexImage2D

So what would be the proper way of creating gl texture from sdl surface in go?

Answer 1

事实证明，有Surface.Data函数返回实际指针。

gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, image.W, image.H, 0, gl.RGBA, gl.UNSIGNED_BYTE, image.Data())