// 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 (tag *trtag) initScene() {
tag.mvp64 = lin.NewM4()
tag.mvp32 = &render.M4{}
tag.persp = lin.NewPersp(60, float64(600)/float64(600), 0.1, 50)
tag.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))
// Gather the one scene into this one vertex array object.
gl.GenVertexArrays(1, &tag.vao)
gl.BindVertexArray(tag.vao)
// create shaders
tag.initShader()
gl.UseProgram(tag.shaders)
// vertex data.
var vbuff uint32
gl.GenBuffers(1, &vbuff)
gl.BindBuffer(gl.ARRAY_BUFFER, vbuff)
gl.BufferData(gl.ARRAY_BUFFER, int64(len(tag.points)*4), gl.Pointer(&(tag.points[0])), gl.STATIC_DRAW)
vattr := uint32(gl.GetAttribLocation(tag.shaders, "in_Position"))
gl.EnableVertexAttribArray(vattr)
gl.VertexAttribPointer(vattr, 4, gl.FLOAT, false, 0, 0)
// colour data.
var cbuff uint32
gl.GenBuffers(1, &cbuff)
gl.BindBuffer(gl.ARRAY_BUFFER, cbuff)
gl.BufferData(gl.ARRAY_BUFFER, int64(len(tag.colour)*4), gl.Pointer(&(tag.colour[0])), gl.STATIC_DRAW)
cattr := uint32(gl.GetAttribLocation(tag.shaders, "in_Color"))
gl.EnableVertexAttribArray(cattr)
gl.VertexAttribPointer(cattr, 4, gl.FLOAT, false, 0, 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(tag.faces)), gl.Pointer(&(tag.faces[0])), gl.STATIC_DRAW)
// set some state that doesn't need to change during drawing.
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Enable(gl.DEPTH_TEST)
gl.Enable(gl.CULL_FACE)
gl.CullFace(gl.BACK)
}