// newRoadie is expected to be called once during engine initializes.
func newRoadie(ac audio.Audio, gc render.Renderer) *roadie {
r := &roadie{}
r.ld = data.NewLoader()
r.gc = gc
r.ac = ac
return r
}
// 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 != nil {
defer al.CloseDevice(dev)
// create a context on the device.
if ctx := al.CreateContext(dev, nil); ctx != nil {
defer al.MakeContextCurrent(nil)
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.
sound := &data.Sound{}
loader := data.NewLoader()
loader.Load("bloop", &sound)
if sound == nil {
log.Printf("au: error loading audio file", "bloop")
return
}
// copy the audio data into the buffer
tag := &autag{}
format := tag.audioFormat(sound)
if format < 0 {
log.Printf("au: error recognizing audio format")
return
}
al.BufferData(buffer, int32(format), al.Pointer(&(sound.AudioData[0])), int32(sound.DataSize), int32(sound.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 err := al.GetError(); err != 0 {
log.Printf("au: OpenAL error ", err)
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 (tag *trtag) initShader() {
shader := &data.Shader{}
loader := data.NewLoader()
loader.Load("basic", &shader)
tag.shaders = gl.CreateProgram()
if err := gl.BindProgram(tag.shaders, shader.Vsh, shader.Fsh); 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")
}
}
// initShader compiles shaders and links them into a shader program.
func (ld *ldtag) initShader() {
shader := &data.Shader{}
loader := data.NewLoader()
loader.Load("monkey", &shader)
ld.shaders = gl.CreateProgram()
gl.BindAttribLocation(ld.shaders, 0, "inPosition")
gl.BindAttribLocation(ld.shaders, 1, "inNormal")
if err := gl.BindProgram(ld.shaders, shader.Vsh, shader.Fsh); 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 (tb *tbtag) initShader() {
shader := &data.Shader{}
loader := data.NewLoader()
loader.Load("tuv", &shader)
tb.shaders = gl.CreateProgram()
gl.BindAttribLocation(tb.shaders, 0, "vertexPosition")
gl.BindAttribLocation(tb.shaders, 2, "uvPoint")
if err := gl.BindProgram(tb.shaders, shader.Vsh, shader.Fsh); err != nil {
fmt.Printf("Failed to create program: %s\n", err)
}
tb.mvpref = gl.GetUniformLocation(tb.shaders, "Mvpm")
tb.sampler = gl.GetUniformLocation(tb.shaders, "uvSampler")
if tb.mvpref < 0 {
fmt.Printf("No model-view-projection matrix in vertex shader\n")
}
}
// initScene is called once on startup to load the 3D data.
func (ld *ldtag) initScene() {
ld.persp = lin.NewM4()
ld.mvp64 = lin.NewM4()
ld.mvp32 = &render.M4{}
gl.Init()
mesh := &data.Mesh{}
loader := data.NewLoader()
loader.Load("monkey", &mesh)
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)
var vattr uint32 = 0
gl.VertexAttribPointer(vattr, 4, gl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(vattr)
// 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)
var nattr uint32 = 1
gl.VertexAttribPointer(nattr, 3, gl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(nattr)
// faces data, uint32 in this case, so 4 bytes per element.
var ebuff uint32
gl.GenBuffers(1, &ebuff)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, ebuff)
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)
}
// initScene is one time initialization that creates a single VAO
func (sf *sftag) initScene() {
sf.mvp32 = &render.M4{}
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.points)*4), gl.Pointer(&(sf.points[0])), gl.STATIC_DRAW)
var vattr uint32 = 0
gl.VertexAttribPointer(vattr, 4, gl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(vattr)
// 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.
shader := &data.Shader{}
loader := data.NewLoader()
loader.Load("fire", &shader)
sf.shaders = gl.CreateProgram()
if err := gl.BindProgram(sf.shaders, shader.Vsh, shader.Fsh); 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, "resolution")
sf.ortho = lin.NewOrtho(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)
}
// test that an audio resource can be loaded. Mimics the
// steps taken by the engine.
func TestAudio(t *testing.T) {
a := &openal{}
a.Init()
sound := &data.Sound{}
loader := data.NewLoader()
loader.SetDir("../eg/audio", sound)
loader.Load("bloop", &sound)
err := a.BindSound(sound)
if err != nil || sound.Buffer == 0 {
t.Error("Failed to load audio resource")
}
// Don't play noises during normal testing, but if you're interested...
// Need to "import time" and sleep a bit for the sound to happen.
// n := NewSoundMaker(sound)
// n.Play()
// time.Sleep(500 * time.Millisecond)
a.Shutdown()
}
// initTexture loads the texture and binds it to the graphics device.
func (tb *tbtag) initTexture() {
texture := &data.Texture{}
loader := data.NewLoader()
if loader.Load("image", &texture); texture != nil {
tb.texture = texture
gl.GenTextures(1, &texture.Tid)
gl.BindTexture(gl.TEXTURE_2D, texture.Tid)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
// ensure image is in RGBA format
b := texture.Img.Bounds()
rgba := image.NewRGBA(image.Rect(0, 0, b.Dx(), b.Dy()))
draw.Draw(rgba, rgba.Bounds(), texture.Img, b.Min, draw.Src)
width, height := int32(b.Dx()), int32(b.Dy())
gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, width, height, 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&(rgba.Pix[0])))
if glerr := gl.GetError(); glerr != gl.NO_ERROR {
fmt.Printf("Failed binding texture image.png\n")
}
} else {
fmt.Println("Could not load image.png file.")
}
}