func reinitScreen(width, height int) {
winWidth, winHeight = gl.Sizei(width), gl.Sizei(height)
if sdlScreen != nil {
sdlScreen.Free()
}
sdlScreen = sdl.SetVideoMode(width, height, 24, sdl.OPENGL|sdl.RESIZABLE)
if sdlScreen == nil {
panic("SDL video init error")
}
}
func glFillTextureFromImageFile(filePath string) {
var file, err = os.Open(filePath)
var img image.Image
if err != nil {
panic(err)
}
defer file.Close()
if img, _, err = image.Decode(file); err != nil {
panic(err)
}
w, h := img.Bounds().Dx(), img.Bounds().Dy()
rgba := image.NewRGBA(image.Rect(0, 0, w, h))
for x := 0; x < w; x++ {
for y := 0; y < h; y++ {
rgba.Set(x, y, img.At(x, y))
}
}
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, gl.Sizei(w), gl.Sizei(h), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&rgba.Pix[0]))
}
func glGetInfoLog(shaderOrProgram gl.Uint, isShader bool) string {
var l = gl.Sizei(256)
var s = gl.GLStringAlloc(l)
defer gl.GLStringFree(s)
if isShader {
gl.GetShaderInfoLog(shaderOrProgram, l, nil, s)
} else {
gl.GetProgramInfoLog(shaderOrProgram, l, nil, s)
}
return gl.GoString(s)
}
func glSetShaderSource(shader gl.Uint, source string) {
var src = gl.GLStringArray(source)
defer gl.GLStringArrayFree(src)
gl.ShaderSource(shader, gl.Sizei(len(src)), &src[0], nil)
}