// newLoader is expected to be called once on startup by the engine.
func newLoader(loaded chan []*loadReq, binder chan msg) *loader {
l := &loader{loaded: loaded, binder: binder}
l.ld = load.NewLoader()
l.cache = newCache()
l.stop = make(chan bool)
l.load = make(chan []*loadReq)
return l
}
// au demonstrates basic audio library, vu/audio/al, capabilities.
// It checks that OpenAL is installed and the bindings are working
// by loading and playing a sound.
func au() {
al.Init() // map the bindings to the OpenAL dynamic library.
// open the default device.
if dev := al.OpenDevice(""); dev != 0 {
defer al.CloseDevice(dev)
// create a context on the device.
if ctx := al.CreateContext(dev, nil); ctx != 0 {
defer al.MakeContextCurrent(0)
defer al.DestroyContext(ctx)
al.MakeContextCurrent(ctx)
// create buffers and sources
var buffer, source uint32
al.GenBuffers(1, &buffer)
al.GenSources(1, &source)
// read in the audio data.
ldr := load.NewLoader()
wh, data, err := ldr.Wav("bloop")
if err != nil {
log.Printf("au: error loading audio file %s %s", "bloop", err)
return
}
// copy the audio data into the buffer
tag := &autag{}
format := tag.audioFormat(wh)
if format < 0 {
log.Printf("au: error recognizing audio format")
return
}
al.BufferData(buffer, int32(format), al.Pointer(&(data[0])), int32(wh.DataSize), int32(wh.Frequency))
// attach the source to a buffer.
al.Sourcei(source, al.BUFFER, int32(buffer))
// check for any audio library errors that have happened up to this point.
if openAlErr := al.GetError(); openAlErr != 0 {
log.Printf("au: OpenAL error %d", openAlErr)
return
}
// Start playback and give enough time for the playback to finish.
al.SourcePlay(source)
time.Sleep(500 * time.Millisecond)
return
}
log.Printf("au: error, failed to get a context")
}
log.Printf("au: error, failed to get a device")
}
// initShader compiles shaders and links them into a shader program.
func (ld *ldtag) initShader() {
shader := "monkey"
loader := load.NewLoader()
vsrc, verr := loader.Vsh(shader)
fsrc, ferr := loader.Fsh(shader)
if verr == nil && ferr == nil {
ld.shaders = gl.CreateProgram()
if err := gl.BindProgram(ld.shaders, vsrc, fsrc); err != nil {
fmt.Printf("Failed to create program: %s\n", err)
}
ld.mvpref = gl.GetUniformLocation(ld.shaders, "modelViewProjectionMatrix")
if ld.mvpref < 0 {
fmt.Printf("No modelViewProjectionMatrix in vertex shader\n")
}
}
}
// initShader compiles shaders and links them into a shader program.
func (tag *trtag) initShader() {
shader := "basic"
loader := load.NewLoader()
vsrc, verr := loader.Vsh(shader)
fsrc, ferr := loader.Fsh(shader)
if verr == nil && ferr == nil {
tag.shaders = gl.CreateProgram()
if err := gl.BindProgram(tag.shaders, vsrc, fsrc); err != nil {
fmt.Printf("Failed to create program: %s\n", err)
}
tag.mvpRef = gl.GetUniformLocation(tag.shaders, "mvpm")
if tag.mvpRef < 0 {
fmt.Printf("No model-view-projection matrix in vertex shader\n")
}
}
}
// initScene is one time initialization that creates a single VAO
func (sf *sftag) initScene() {
sf.sTime = time.Now()
sf.initData()
// Bind the OpenGL calls and dump some version info.
gl.Init()
fmt.Printf("%s %s", gl.GetString(gl.RENDERER), gl.GetString(gl.VERSION))
fmt.Printf(" GLSL %s\n", gl.GetString(gl.SHADING_LANGUAGE_VERSION))
gl.GenVertexArrays(1, &sf.vao)
gl.BindVertexArray(sf.vao)
// vertex data.
var vbuff uint32
gl.GenBuffers(1, &vbuff)
gl.BindBuffer(gl.ARRAY_BUFFER, vbuff)
gl.BufferData(gl.ARRAY_BUFFER, int64(len(sf.verticies)*4), gl.Pointer(&(sf.verticies[0])), gl.STATIC_DRAW)
gl.VertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(0)
// faces data.
var ebuff uint32
gl.GenBuffers(1, &ebuff)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebuff)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, int64(len(sf.faces)), gl.Pointer(&(sf.faces[0])), gl.STATIC_DRAW)
// create texture and shaders after all the data has been set up.
// renderer := render.New()
shader := "fire"
loader := load.NewLoader()
vsrc, verr := loader.Vsh(shader)
fsrc, ferr := loader.Fsh(shader)
if verr == nil && ferr == nil {
sf.shaders = gl.CreateProgram()
if err := gl.BindProgram(sf.shaders, vsrc, fsrc); err != nil {
fmt.Printf("Failed to create program: %s\n", err)
}
sf.mvpref = gl.GetUniformLocation(sf.shaders, "mvpm")
sf.gTime = gl.GetUniformLocation(sf.shaders, "time")
sf.sizes = gl.GetUniformLocation(sf.shaders, "screen")
sf.mvp = render.NewMvp().Set(lin.NewM4().Ortho(0, 4, 0, 4, 0, 10))
// set some state that doesn't need to change during drawing.
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
}
}
// initScene is called once on startup to load the 3D data.
func (ld *ldtag) initScene() {
ld.persp = lin.NewM4()
ld.mvp64 = lin.NewM4()
ld.mvp = render.NewMvp()
gl.Init()
ldr := load.NewLoader()
meshes, _ := ldr.Obj("monkey")
mesh := meshes[0]
ld.faceCount = int32(len(mesh.F))
// Gather the one scene into this one vertex array object.
gl.GenVertexArrays(1, &ld.vao)
gl.BindVertexArray(ld.vao)
// vertex data.
var vbuff uint32
gl.GenBuffers(1, &vbuff)
gl.BindBuffer(gl.ARRAY_BUFFER, vbuff)
gl.BufferData(gl.ARRAY_BUFFER, int64(len(mesh.V)*4), gl.Pointer(&(mesh.V[0])), gl.STATIC_DRAW)
gl.VertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(0)
// normal data.
var nbuff uint32
gl.GenBuffers(1, &nbuff)
gl.BindBuffer(gl.ARRAY_BUFFER, nbuff)
gl.BufferData(gl.ARRAY_BUFFER, int64(len(mesh.N)*4), gl.Pointer(&(mesh.N[0])), gl.STATIC_DRAW)
gl.VertexAttribPointer(1, 3, gl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(1)
// faces data, uint32 in this case, so 4 bytes per element.
var fbuff uint32
gl.GenBuffers(1, &fbuff)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, fbuff)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, int64(len(mesh.F)*2), gl.Pointer(&(mesh.F[0])), gl.STATIC_DRAW)
ld.initShader()
gl.ClearColor(0.2, 0.2, 0.2, 1.0)
gl.Enable(gl.DEPTH_TEST)
gl.Enable(gl.CULL_FACE)
// set the initial perspetive matrix.
ld.resize(0, 0, 800, 600)
}
// importShader transfers data loaded from disk to the render object.
func (l *loader) importShader(s *shader) error {
ld := load.NewLoader()
// first look for .vsh, .fsh disk files.
vsrc, verr := ld.Vsh(s.name)
fsrc, ferr := ld.Fsh(s.name)
if verr == nil && ferr == nil {
s.setSource(vsrc, fsrc)
return nil
}
// next look for a pre-defined engine shader.
if sfn, ok := shaderLibrary[s.name]; ok {
vsrc, fsrc = sfn()
s.setSource(vsrc, fsrc)
return nil
}
return fmt.Errorf("Could not find shader %s", s.name)
}
// test that an audio resource can be loaded. Mimics the steps taken
// by the engine. Depends on sound resources from the examples directory.
func TestAudio(t *testing.T) {
a := audioWrapper()
a.Init()
loader := load.NewLoader()
loader.SetDir(2, "../eg/audio") // 2 == load.snd
soundData := &Data{}
if wh, data, err := loader.Wav("bloop"); err == nil {
soundData.Set(wh.Channels, wh.SampleBits, wh.Frequency, wh.DataSize, data)
}
snd, buff := uint64(0), uint64(0)
if err := a.BindSound(&snd, &buff, soundData); err != nil || buff == 0 || snd == 0 {
t.Errorf("Failed to load audio resource %d %d : %s", snd, buff, err)
}
// Don't play noises during normal testing, but if you're interested...
// ... then uncomment and "import time" (need to sleep for the sound to happen).
// a.PlaySound(snd, 0, 0, 0)
// time.Sleep(500 * time.Millisecond)
a.Dispose()
}
// initRender is one time initialization that creates a single VAO
// to display a single ray trace generated texture.
func (rt *rtrace) initRender() {
rt.verts = []float32{ // four verticies for a quad.
0, 0, 0,
4, 0, 0,
0, 4, 0,
4, 4, 0,
}
rt.faces = []uint8{ // create quad from 2 triangles.
0, 2, 1,
1, 2, 3,
}
rt.uvs = []float32{ // texture coordinates to sample the image.
0, 0,
1, 0,
0, 1,
1, 1,
}
// Start up OpenGL and create a single vertex array object.
gl.Init()
gl.GenVertexArrays(1, &rt.vao)
gl.BindVertexArray(rt.vao)
// vertex data.
var vbuff uint32
gl.GenBuffers(1, &vbuff)
gl.BindBuffer(gl.ARRAY_BUFFER, vbuff)
gl.BufferData(gl.ARRAY_BUFFER, int64(len(rt.verts)*4), gl.Pointer(&(rt.verts[0])), gl.STATIC_DRAW)
gl.VertexAttribPointer(0, 3, gl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(0)
// faces data.
var ebuff uint32
gl.GenBuffers(1, &ebuff)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebuff)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, int64(len(rt.faces)), gl.Pointer(&(rt.faces[0])), gl.STATIC_DRAW)
// texture coordatinates
var tbuff uint32
gl.GenBuffers(1, &tbuff)
gl.BindBuffer(gl.ARRAY_BUFFER, tbuff)
gl.BufferData(gl.ARRAY_BUFFER, int64(len(rt.uvs)*4), gl.Pointer(&(rt.uvs[0])), gl.STATIC_DRAW)
var tattr uint32 = 2
gl.VertexAttribPointer(tattr, 2, gl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(tattr)
// use ray trace generated texture image.
bounds := rt.img.Bounds()
width, height := int32(bounds.Dx()), int32(bounds.Dy())
ptr := gl.Pointer(&(rt.img.Pix[0]))
gl.GenTextures(1, &rt.texId)
gl.BindTexture(gl.TEXTURE_2D, rt.texId)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, ptr)
// texture sampling shader.
loader := load.NewLoader()
shader := "tuv"
vsrc, verr := loader.Vsh(shader)
fsrc, ferr := loader.Fsh(shader)
if verr != nil || ferr != nil {
log.Fatalf("Failed to load shaders %s %s\n", verr, ferr)
}
rt.shaders = gl.CreateProgram()
if err := gl.BindProgram(rt.shaders, vsrc, fsrc); err != nil {
log.Fatalf("Failed to create program: %s\n", err)
}
rt.mvpId = gl.GetUniformLocation(rt.shaders, "mvpm")
rt.tex2D = gl.GetUniformLocation(rt.shaders, "sampler2D")
rt.mvp = render.NewMvp().Set(lin.NewM4().Ortho(0, 4, 0, 4, 0, 10))
// set some state that doesn't need to change during drawing.
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
}