func glGetLocation(glProg gl.Uint, name string, isAtt bool) gl.Uint {
var a gl.Int
var s = gl.GLString(name)
defer gl.GLStringFree(s)
if isAtt {
a = gl.GetAttribLocation(glProg, s)
} else {
a = gl.GetUniformLocation(glProg, s)
}
if a < 0 {
panic("Shader attribute or uniform bind error")
}
return gl.Uint(a)
}
func ShaderLocation(glProg gl.Uint, name string, isAtt bool) gl.Int {
var loc gl.Int
var s = gl.GLString(name)
defer gl.GLStringFree(s)
if isAtt {
loc = gl.GetAttribLocation(glProg, s)
} else {
loc = gl.GetUniformLocation(glProg, s)
}
// if loc < 0 { log.Panicf("sprog att/uni %s: bind error %d", name, loc) }
// PanicIfErrors("ShaderLocation(n=%v a=%v)", name, isAtt)
LastErrors()
return loc
}
// Loads a shader from a string
func LoadShader(typ g.Enum, s string) g.Uint {
shader := g.CreateShader(typ)
cst := g.GLString(s)
defer g.GLStringFree(cst)
g.ShaderSource(shader, 1, &cst, nil)
g.CompileShader(shader)
var status g.Int
g.GetShaderiv(shader, g.COMPILE_STATUS, &status)
if status == g.FALSE {
var length g.Int
g.GetShaderiv(shader, g.INFO_LOG_LENGTH, &length)
log.Println(int(length))
logStr := g.GLStringAlloc(g.Sizei(length + 1))
// TODO: defer
g.GetShaderInfoLog(shader, g.Sizei(length), nil, logStr)
log.Println(g.GoString(logStr))
}
return shader
}
func GetUniformLocation(p g.Uint, s string) g.Int {
cstr := g.GLString(s)
defer g.GLStringFree(cstr)
return g.GetUniformLocation(p, cstr)
}