func createShader(name string, shaderType int) (gl.Uint, error) {
data, err := fileRead(name)
if err != nil {
return 0, err
}
if len(data) == 0 {
return 0, errors.New("No shader code.")
}
var shader gl.Uint
switch shaderType {
case VertexShaderType:
shader = gl.CreateShader(gl.VERTEX_SHADER)
case FragmentShaderType:
shader = gl.CreateShader(gl.FRAGMENT_SHADER)
default:
return 0, errors.New("Unknown ShaderType.")
}
src := gl.GLStringArray(string(data))
defer gl.GLStringArrayFree(src)
gl.ShaderSource(shader, gl.Sizei(1), &src[0], nil)
gl.CompileShader(shader)
// Similar to print_log in the C code example
var length gl.Int
gl.GetShaderiv(shader, gl.INFO_LOG_LENGTH, &length)
if length > 1 {
glString := gl.GLStringAlloc(gl.Sizei(length))
defer gl.GLStringFree(glString)
gl.GetShaderInfoLog(shader, gl.Sizei(length), nil, glString)
return 0, errors.New(fmt.Sprintf("Shader log: %s", gl.GoString(glString)))
}
return shader, nil
}
func (shader *Shader) GetInfoLog() string {
length := shader.Get(gl33.INFO_LOG_LENGTH)
log := gl33.GLStringAlloc(gl33.Sizei(length + 1))
defer gl33.GLStringFree(log)
gl33.GetShaderInfoLog(shader.Id, gl33.Sizei(length), nil, log)
return gl33.GoString(log)
}
func (p *Program) getError() error {
var logLength gl.Int
gl.GetProgramiv(p.id, gl.INFO_LOG_LENGTH, &logLength)
log := gl.GLStringAlloc(gl.Sizei(logLength))
defer gl.GLStringFree(log)
gl.GetProgramInfoLog(p.id, gl.Sizei(logLength), nil, log)
err := gl.GoString(log)
return errors.New(err)
}
func (s *Shader) getError() error {
var logLength gl.Int
gl.GetShaderiv(s.id, gl.INFO_LOG_LENGTH, &logLength)
log := gl.GLStringAlloc(gl.Sizei(logLength))
defer gl.GLStringFree(log)
gl.GetShaderInfoLog(s.id, gl.Sizei(logLength), nil, log)
err := gl.GoString(log)
return errors.New(err)
}