func NewMesh(attrs interface{}, indicies []uint32) *Mesh {
mesh := new(Mesh)
mesh.Attrs = attrs
mesh.Indicies = indicies
gl33.GenVertexArrays(1, &mesh.vao)
gl33.BindVertexArray(mesh.vao)
attrsValue := reflect.ValueOf(attrs)
mesh.vertexBO = NewBuffer(gl33.ARRAY_BUFFER, gl33.STATIC_DRAW, attrs)
vertexSpec := attrsValue.Type().Elem()
if vertexSpec.Kind() != reflect.Struct && vertexSpec.Kind() != reflect.Array {
panic("attrs is not a slice of structs or arrays")
}
var num int
if vertexSpec.Kind() == reflect.Struct {
num = vertexSpec.NumField()
} else {
num = vertexSpec.Len()
}
for i, offset := 0, uintptr(0); i < num; i++ {
var field reflect.Type
var type_ gl33.Enum
var dimensions int
if vertexSpec.Kind() == reflect.Struct {
field = vertexSpec.Field(i).Type
} else {
field = vertexSpec.Elem()
}
if field.Kind() == reflect.Array {
type_ = glType(field.Elem().Kind())
dimensions = field.Len()
} else {
type_ = glType(field.Kind())
dimensions = 1
}
setupAttrib(gl33.Uint(i), type_, dimensions, offset, int(vertexSpec.Size()))
offset += field.Size()
}
mesh.indexBO = NewBuffer(gl33.ELEMENT_ARRAY_BUFFER, gl33.STATIC_DRAW, indicies)
return mesh
}
func main() {
var window *sdl.Window
var context sdl.GLContext
var event sdl.Event
var running bool
var err error
runtime.LockOSThread()
if err = sdl.Init(sdl.INIT_EVERYTHING); err != nil {
panic(err)
}
defer sdl.Quit()
window, err = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED,
sdl.WINDOWPOS_UNDEFINED,
winWidth, winHeight, sdl.WINDOW_OPENGL)
if err != nil {
panic(err)
}
defer window.Destroy()
context, err = sdl.GL_CreateContext(window)
if err != nil {
panic(err)
}
defer sdl.GL_DeleteContext(context)
gl.Init()
gl.Viewport(0, 0, gl.Sizei(winWidth), gl.Sizei(winHeight))
// OPENGL FLAGS
gl.ClearColor(0.0, 0.1, 0.0, 1.0)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
// VERTEX BUFFER
var vertexbuffer gl.Uint
gl.GenBuffers(1, &vertexbuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_vertices)*4), gl.Pointer(&triangle_vertices[0]), gl.STATIC_DRAW)
// COLOUR BUFFER
var colourbuffer gl.Uint
gl.GenBuffers(1, &colourbuffer)
gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_colours)*4), gl.Pointer(&triangle_colours[0]), gl.STATIC_DRAW)
// GUESS WHAT
program := createprogram()
// VERTEX ARRAY
var VertexArrayID gl.Uint
gl.GenVertexArrays(1, &VertexArrayID)
gl.BindVertexArray(VertexArrayID)
gl.EnableVertexAttribArray(0)
gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
gl.VertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 0, nil)
// VERTEX ARRAY HOOK COLOURS
gl.EnableVertexAttribArray(1)
gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
gl.VertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 0, nil)
//UNIFORM HOOK
unistring := gl.GLString("scaleMove")
UniScale = gl.GetUniformLocation(program, unistring)
fmt.Printf("Uniform Link: %v\n", UniScale+1)
gl.UseProgram(program)
running = true
for running {
for event = sdl.PollEvent(); event != nil; event =
sdl.PollEvent() {
switch t := event.(type) {
case *sdl.QuitEvent:
running = false
case *sdl.MouseMotionEvent:
xrot = float32(t.Y) / 2
yrot = float32(t.X) / 2
fmt.Printf("[%dms]MouseMotion\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n", t.Timestamp, t.Which, t.X, t.Y, t.XRel, t.YRel)
}
}
drawgl()
sdl.GL_SwapWindow(window)
}
}
func (mesh *Mesh) Render() {
gl33.BindVertexArray(mesh.vao)
gl33.DrawElements(gl33.TRIANGLES, gl33.Sizei(len(mesh.Indicies)), gl33.UNSIGNED_INT, gl33.Pointer(uintptr(0)))
}