func (t *Texture) ReadTextureFromGPU() []byte {
t.Bind()
b := gl.GenBuffer()
b.Bind(gl.PIXEL_UNPACK_BUFFER)
gl.BufferData(gl.PIXEL_UNPACK_BUFFER, t.Width()*t.Height()*t.PixelSize(), 0, gl.STREAM_DRAW)
//gl.GetTexImage(t.target, 0, t.format, buffer)
b.Bind(gl.PIXEL_UNPACK_BUFFER)
gl.TexSubImage2D(t.target, 0, 0, 0, t.Width(), t.Height(), t.format, t.typ, unsafe.Pointer(uintptr(0)))
b.Bind(gl.PIXEL_UNPACK_BUFFER)
l := t.Width() * t.Height() * t.PixelSize()
gl.BufferData(gl.PIXEL_UNPACK_BUFFER, t.Width()*t.Height()*t.PixelSize(), 0, gl.STREAM_DRAW)
ptr := gl.MapBuffer(gl.PIXEL_UNPACK_BUFFER, gl.WRITE_ONLY)
var x []byte
s := (*reflect.SliceHeader)(unsafe.Pointer(&x))
s.Data = uintptr(ptr)
s.Len = l
s.Cap = l
gl.UnmapBuffer(gl.PIXEL_UNPACK_BUFFER)
return x
}
func fill(canv *Canvas, alphaTex *glh.Texture, paint *Paint) {
gGl.GlColorConfig.SetColor(paint.fillColor)
defer gGl.GlColorConfig.Reset()
gGl.Activate(gGl.FillDrawer)
gl.ColorMask(true, true, true, true)
gl.StencilMask(0x3)
gl.StencilFunc(gl.LESS, 0, 0xff)
w, h := canv.W, canv.H
p := canv.toGLPoints([]Point{
iPt(0, 0),
iPt(w, 0),
iPt(w, h),
iPt(0, h),
})
vertices := []float32{
p[0].X, p[0].Y, 0, 1,
p[1].X, p[1].Y, 1, 1,
p[2].X, p[2].Y, 1, 0,
p[3].X, p[3].Y, 0, 0,
}
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*4, vertices, gl.STATIC_DRAW)
elements := []uint32{
0, 1, 2,
2, 3, 0,
}
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(elements)*4, elements, gl.STATIC_DRAW)
glh.With(alphaTex, func() {
gl.DrawElements(gl.TRIANGLES, 6, gl.UNSIGNED_INT, nil)
})
}
// Create a new model from the given data slice.
func NewModel(vertices []Vertex, indices []uint32) (*Model, error) {
// TODO add error detection
m := new(Model)
m.vertices, m.indices = vertices, indices
m.program = &DefaultShaderProgram
m.vao = gl.GenVertexArray()
m.vao.Bind()
m.vbo = gl.GenBuffer()
m.vbo.Bind(gl.ARRAY_BUFFER)
m.ibo = gl.GenBuffer()
m.ibo.Bind(gl.ELEMENT_ARRAY_BUFFER)
vSize := int(unsafe.Sizeof(m.vertices[0]))
uSize := int(unsafe.Sizeof(uint32(0)))
gl.BufferData(gl.ARRAY_BUFFER, len(m.vertices)*vSize, &m.vertices[0],
gl.STATIC_DRAW)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(m.indices)*uSize, &m.indices[0],
gl.STATIC_DRAW)
posLoc.EnableArray()
colorLoc.EnableArray()
posLoc.AttribPointer(3, gl.FLOAT, false, vSize, uintptr(0))
colorLoc.AttribPointer(4, gl.FLOAT, false, vSize,
uintptr(int(unsafe.Sizeof(float32(0))*3)))
colorLoc.DisableArray()
posLoc.DisableArray()
m.vbo.Unbind(gl.ARRAY_BUFFER)
m.ibo.Unbind(gl.ELEMENT_ARRAY_BUFFER)
return m, nil
}
func (self *OpenGLRenderer) LoadMesh(mesh *render.Mesh) {
if len(mesh.VertexList) == 0 {
log.Println("WARNING Stopping load of mesh [", mesh.Name, "] with no verticies")
return
}
vertexArrayObj := gl.GenVertexArray()
vertexArrayObj.Bind()
vertexBuffer := gl.GenBuffer()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(mesh.VertexList)*4, mesh.VertexList, gl.STATIC_DRAW)
attribLoc := gl.AttribLocation(0)
attribLoc.EnableArray()
attribLoc.AttribPointer(3, gl.FLOAT, false, 0, nil)
if len(mesh.UVList) > 0 {
uvBuffer := gl.GenBuffer()
uvBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(mesh.UVList)*4, mesh.UVList, gl.STATIC_DRAW)
attribLoc := gl.AttribLocation(1)
attribLoc.EnableArray()
attribLoc.AttribPointer(2, gl.FLOAT, false, 0, nil)
mesh.UVBuffer = uvBuffer
} else if len(mesh.ColorList) > 0 {
colorBuffer := gl.GenBuffer()
colorBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(mesh.ColorList)*4, mesh.ColorList, gl.STATIC_DRAW)
attribLoc := gl.AttribLocation(1)
attribLoc.EnableArray()
attribLoc.AttribPointer(3, gl.FLOAT, false, 0, nil)
mesh.ColorBuffer = colorBuffer
}
if len(mesh.IndexList) > 0 {
indexBuffer := gl.GenBuffer()
indexBuffer.Bind(gl.ELEMENT_ARRAY_BUFFER)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(mesh.IndexList)*4, mesh.IndexList, gl.STATIC_DRAW)
mesh.IndexBuffer = indexBuffer
}
mesh.VertexArrayObj = vertexArrayObj
mesh.VertexBuffer = vertexBuffer
}
func (b *VertexBuffer) SetVertices(src []byte, usage Usage) error {
gl.VertexArray(0).Bind()
b.bind()
// set size of buffer and invalidate it
gl.BufferData(gl.ARRAY_BUFFER, len(src), nil, usage.gl())
if len(src) > 0 {
// if unmap returns false, the buffer we wrote to is no longer valid and we
// need to try again. though, this is apparently uncommon in modern
// drivers. this means it is not feasible to compute/copy vertices directly
// into the mapped buffer. however, it would be nice to provide a
// failure-capable API to do this.
const maxretries = 5
retries := 0
for ; retries < maxretries; retries++ {
ptr := gl.MapBuffer(gl.ARRAY_BUFFER, gl.WRITE_ONLY)
slicehdr := reflect.SliceHeader{
Data: uintptr(ptr),
Len: len(src),
Cap: len(src),
}
dest := *(*[]byte)(unsafe.Pointer(&slicehdr))
copy(dest, src)
if gl.UnmapBuffer(gl.ARRAY_BUFFER) {
break
}
}
if retries == maxretries {
return errMapBufferFailed
}
}
b.count = len(src) / b.format.Stride()
return nil
}
func MakeBuffer(target gl.GLenum, size int, data interface{}) gl.Buffer {
buffer := gl.GenBuffer()
buffer.Bind(target)
gl.BufferData(target, size, data, gl.STATIC_DRAW)
gl.BufferUnbind(target)
return buffer
}
func newVertexBuffer(geometry Shape) gl.Buffer {
result := []float32{}
faces := geometry.Faces()
vertices := geometry.Vertices()
if len(faces) > 0 {
// Handle faces
for _, face := range faces {
for i := 0; i < 3; i++ {
vertex := vertices[face.At(i)]
result = append(result, vertex.X(), vertex.Y(), vertex.Z())
}
}
} else {
// Handle plain vertices
for _, vertex := range geometry.Vertices() {
result = append(result, vertex.X(), vertex.Y(), vertex.Z())
}
}
glBuffer := gl.GenBuffer()
glBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(result)*3*4, result, gl.STATIC_DRAW)
return glBuffer
}
// NewIndex creates a new element index
func NewIndex(data []uint16) *Index {
glBuffer := gl.GenBuffer()
glBuffer.Bind(gl.ELEMENT_ARRAY_BUFFER)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(data)*int(glh.Sizeof(gl.UNSIGNED_SHORT)), data, gl.STATIC_DRAW)
return &Index{glBuffer: glBuffer, count: len(data)}
}
func main() {
if err := glfw.Init(); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
defer glfw.Terminate()
glfw.OpenWindowHint(glfw.FsaaSamples, 4)
glfw.OpenWindowHint(glfw.OpenGLVersionMajor, 3)
glfw.OpenWindowHint(glfw.OpenGLVersionMinor, 3)
glfw.OpenWindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
if err := glfw.OpenWindow(1024, 768, 0, 0, 0, 0, 32, 0, glfw.Windowed); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
gl.Init() // Can't find gl.GLEW_OK or any variation, not sure how to check if this worked
gl.GetError() // Ignore error
glfw.SetWindowTitle("Tutorial 02")
glfw.Enable(glfw.StickyKeys)
gl.ClearColor(0., 0., 0.4, 0.)
prog := helper.MakeProgram("SimpleVertexShader.vertexshader", "SimpleFragmentShader.fragmentshader")
vBufferData := [...]float32{
-1., -1., 0.,
1., -1., 0.,
0., 1., 0.}
vertexArray := gl.GenVertexArray()
vertexArray.Bind()
buffer := gl.GenBuffer()
buffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(vBufferData)*4, &vBufferData, gl.STATIC_DRAW)
// Equivalent to a do... while
for ok := true; ok; ok = (glfw.Key(glfw.KeyEsc) != glfw.KeyPress && glfw.WindowParam(glfw.Opened) == gl.TRUE) {
gl.Clear(gl.COLOR_BUFFER_BIT)
prog.Use()
attribLoc := gl.AttribLocation(0)
attribLoc.EnableArray()
buffer.Bind(gl.ARRAY_BUFFER)
attribLoc.AttribPointer(3, gl.FLOAT, false, 0, nil)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
attribLoc.DisableArray()
glfw.SwapBuffers()
}
}
func (r *Renderer) Initialize() {
r.vertices = []mapVertex{
{200, 200, 0, 1, 1, 1, 1, 0, 0},
{218, 200, 0, 1, 0, 0, 1, 0, 0},
}
vs, err := LoadShader(vertexShader, gl.VERTEX_SHADER)
if err != nil {
panic(err)
}
gs, err := LoadShader(geometryShader, gl.GEOMETRY_SHADER)
if err != nil {
panic(err)
}
fs, err := LoadShader(fragmentShader, gl.FRAGMENT_SHADER)
if err != nil {
panic(err)
}
gl.ClearColor(0, 1, 0, 0)
// Create the VAO
// GL 3+ allows us to store the vertex layout in a vertex array object (VAO).
r.vao = gl.GenVertexArray()
r.vao.Bind()
// Create VBO
r.vbo = gl.GenBuffer()
r.vbo.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(r.vertices)*4*9, r.vertices, gl.DYNAMIC_DRAW)
prog, err := LoadProgram(vs, gs, fs)
if err != nil {
panic(err)
}
prog.Use()
r.prog = prog
r.mvmLocation = r.prog.GetUniformLocation("modelview_matrix")
pos := r.prog.GetAttribLocation("in_position")
color := r.prog.GetAttribLocation("in_color")
texcoord := r.prog.GetAttribLocation("in_texcoord")
// FIXME: size math
pos.AttribPointer(3, gl.FLOAT, false, 9*4, nil)
color.AttribPointer(4, gl.FLOAT, false, 9*4, uintptr(3*4))
texcoord.AttribPointer(2, gl.FLOAT, false, 9*4, uintptr(7*4))
pos.EnableArray()
color.EnableArray()
texcoord.EnableArray()
}
func (c *QuadraticCurve) draw(canv *Canvas) {
p := canv.toGLPoints(c.Points())
vertices := []float32{
p[0].X, p[0].Y, 0.0, 0.0,
p[1].X, p[1].Y, 0.5, 0.0,
p[2].X, p[2].Y, 1.0, 1.0,
}
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*4, vertices, gl.STATIC_DRAW)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
}
func (d *DrawImage) render() error {
fn := func(idx int) (err error) {
defer func() {
//err = recover()
}()
vbuf := gl.GenBuffer()
vbuf.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(d.vertex[idx])*4, d.vertex[idx], gl.STATIC_DRAW)
panicGlError()
defer vbuf.Delete()
uvbuf := gl.GenBuffer()
uvbuf.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(d.uv[idx])*4, d.uv[idx], gl.STATIC_DRAW)
panicGlError()
defer uvbuf.Delete()
vloc := gl.AttribLocation(0)
vloc.EnableArray()
vbuf.Bind(gl.ARRAY_BUFFER)
vloc.AttribPointer(3, gl.FLOAT, false, 0, nil)
panicGlError()
defer vloc.DisableArray()
uvloc := gl.AttribLocation(1)
uvloc.EnableArray()
uvbuf.Bind(gl.ARRAY_BUFFER)
uvloc.AttribPointer(2, gl.FLOAT, false, 0, nil)
panicGlError()
defer uvloc.DisableArray()
gl.DrawArrays(gl.TRIANGLES, 0, 3)
return checkGlError()
}
if err := fn(0); err != nil {
return err
}
return fn(1)
}
// updateBuffer fills the OpenGL buffer IF NEEDED.
// It updates the buffer if the bufferdataClean flag is false.
// It is safe to call this method every frame via the concrete classes method
// UpdateBuffer: most of the time it will just return immediately.
func (buffer *baseBuffer) update(vertexdata interface{}) {
if buffer.bufferdataClean {
return
}
if buffer.name == 0 {
panic("tried to update buffer 0")
}
// Convert the Go-friendly data into OpenGL-friendly data.
oldSize := len(buffer.bufferdata)
bufferdata := new(bytes.Buffer)
err := binary.Write(bufferdata, endianness, vertexdata)
if err != nil {
panic(err)
}
buffer.bufferdata = bufferdata.Bytes()
buffer.bufferdataClean = true
newSize := len(buffer.bufferdata)
// Should we make the buffer bigger?
needBigger := newSize > oldSize
buffer.bind()
if needBigger {
// (Re)allocate a buffer.
gl.BufferData(
buffer.target,
len(buffer.bufferdata),
buffer.bufferdata,
buffer.usage,
)
if err := CheckGlError(); err != nil {
err.Description = "gl.BufferData"
panic(err)
}
} else {
// Re-use existing buffer.
gl.BufferSubData(
buffer.target,
0,
len(buffer.bufferdata),
buffer.bufferdata,
)
if err := CheckGlError(); err != nil {
err.Description = "gl.BufferSubData"
panic(err)
}
}
buffer.unbind()
}
func (video *SDLVideo) initGL() {
if gl.Init() != 0 {
panic(sdl.GetError())
}
gl.ClearColor(0.0, 0.0, 0.0, 1.0)
gl.Enable(gl.CULL_FACE)
gl.Enable(gl.DEPTH_TEST)
video.prog = createProgram(vertShaderSrcDef, fragShaderSrcDef)
posAttrib := video.prog.GetAttribLocation("vPosition")
texCoordAttr := video.prog.GetAttribLocation("vTexCoord")
video.textureUni = video.prog.GetAttribLocation("texture")
video.texture = gl.GenTexture()
gl.ActiveTexture(gl.TEXTURE0)
video.texture.Bind(gl.TEXTURE_2D)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
video.prog.Use()
posAttrib.EnableArray()
texCoordAttr.EnableArray()
vertVBO := gl.GenBuffer()
vertVBO.Bind(gl.ARRAY_BUFFER)
verts := []float32{-1.0, 1.0, -1.0, -1.0, 1.0, -1.0, 1.0, -1.0, 1.0, 1.0, -1.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(verts)*int(unsafe.Sizeof(verts[0])), &verts[0], gl.STATIC_DRAW)
textCoorBuf := gl.GenBuffer()
textCoorBuf.Bind(gl.ARRAY_BUFFER)
texVerts := []float32{0.0, 1.0, 0.0, 0.0, 1.0, 0.0, 1.0, 0.0, 1.0, 1.0, 0.0, 1.0}
gl.BufferData(gl.ARRAY_BUFFER, len(texVerts)*int(unsafe.Sizeof(texVerts[0])), &texVerts[0], gl.STATIC_DRAW)
posAttrib.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
texCoordAttr.AttribPointer(2, gl.FLOAT, false, 0, uintptr(0))
}
func newTextVertexBuffer(geometry *TextGeometry) gl.Buffer {
result := []float32{}
vertices := geometry.Vertices
for _, vertex := range vertices {
result = append(result, vertex.X(), vertex.Y())
}
glBuffer := gl.GenBuffer()
glBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(result)*2*4, result, gl.STATIC_DRAW)
return glBuffer
}
func newNormalBuffer(geometry Shape) gl.Buffer {
result := []float32{}
normals := geometry.Normals()
for _, face := range geometry.Faces() {
for i := 0; i < 3; i++ {
normal := normals[face.NormalAt(i)]
result = append(result, normal.X(), normal.Y(), normal.Z())
}
}
glBuffer := gl.GenBuffer()
glBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(result)*3*4, result, gl.STATIC_DRAW)
return glBuffer
}
func (b *IndexBuffer) setIndices(copyTo func(unsafe.Pointer), usage Usage, size int) error {
gl.VertexArray(0).Bind()
b.bind()
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, size, nil, usage.gl())
if size > 0 {
const maxretries = 5
retries := 0
for ; retries < maxretries; retries++ {
ptr := gl.MapBuffer(gl.ELEMENT_ARRAY_BUFFER, gl.WRITE_ONLY)
copyTo(ptr)
if gl.UnmapBuffer(gl.ELEMENT_ARRAY_BUFFER) {
break
}
}
if retries == maxretries {
return errMapBufferFailed
}
}
return nil
}
func newUvBuffer(uvs []mgl32.Vec2, compressed bool) gl.Buffer {
result := []float32{}
for _, uv := range uvs {
result = append(result, uv.X(), uv.Y())
}
if compressed {
// Invert V because we're using a compressed texture
for i := 1; i < len(result); i += 2 {
result[i] = 1.0 - result[i]
}
}
glBuffer := gl.GenBuffer()
glBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(result)*2*4, result, gl.STATIC_DRAW)
return glBuffer
}
func initDefaultPlane() {
defaultBuffer = GenBuffer()
//Triagles
data := make([]float32, 20)
data[0] = -0.5
data[1] = -0.5
data[2] = 1
data[3] = 0.5
data[4] = -0.5
data[5] = 1
data[6] = 0.5
data[7] = 0.5
data[8] = 1
data[9] = -0.5
data[10] = 0.5
data[11] = 1
// UV
data[12] = 0
data[13] = 1
data[14] = 1
data[15] = 1
data[16] = 1
data[17] = 0
data[18] = 0
data[19] = 0
defaultBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(data)*4, data, gl.STATIC_DRAW)
}
func (p *Path) glDraw(canv *Canvas) {
for e := p.Segs.Front(); e != nil; e = e.Next() {
e.Value.(PathSegment).Draw(canv)
}
if GetPt(p.endPoints.Back()).Mathgl().ApproxEqual(
GetPt(p.endPoints.Front()).Mathgl()) {
p.endPoints.Remove(p.endPoints.Back())
}
if p.endPoints.Len() < 3 {
return
}
gGl.Activate(gGl.TriangleDrawer)
gl.BlendFunc(gl.ONE_MINUS_DST_ALPHA, gl.ZERO)
defer gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
pa := make(p2t.PointArray, 0, p.endPoints.Len())
for e := p.endPoints.Front(); e != nil; e = e.Next() {
p := GetPt(e)
pa = append(pa, &p2t.Point{X: float64(p.X), Y: float64(p.Y)})
}
p2t.Init(pa)
triArr := p2t.Triangulate()
vertices := make([]float32, 6, 6)
for _, tri := range triArr {
for i, triPt := range tri.Point {
pt := canv.toGLPoint(Pt(triPt.X, triPt.Y))
vertices[i*2] = pt.X
vertices[i*2+1] = pt.Y
}
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*4, vertices, gl.STATIC_DRAW)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
}
}
func main() {
runtime.LockOSThread()
if !glfw.Init() {
fmt.Fprintf(os.Stderr, "Can't open GLFW")
return
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Samples, 4)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True) // needed for macs
window, err := glfw.CreateWindow(1024, 768, "Tutorial 6", nil, nil)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
window.MakeContextCurrent()
gl.Init()
gl.GetError() // Ignore error
window.SetInputMode(glfw.StickyKeys, 1)
window.SetCursorPosition(1024/2, 768/2)
window.SetInputMode(glfw.Cursor, glfw.CursorHidden)
gl.ClearColor(0., 0., 0.4, 0.)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.CULL_FACE)
camera := input.NewCamera(window)
vertexArray := gl.GenVertexArray()
defer vertexArray.Delete()
vertexArray.Bind()
prog := helper.MakeProgram("TransformVertexShader.vertexshader", "TextureFragmentShader.fragmentshader")
defer prog.Delete()
matrixID := prog.GetUniformLocation("MVP")
texture, err := helper.TextureFromDDS("uvtemplate.DDS")
if err != nil {
fmt.Printf("Couldn't make texture: %v\n", err)
return
}
defer texture.Delete()
texSampler := prog.GetUniformLocation("myTextureSampler")
vBufferData := [...]float32{
-1.0, -1.0, -1.0,
-1.0, -1.0, 1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
-1.0, -1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, -1.0,
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
-1.0, -1.0, -1.0,
-1.0, -1.0, -1.0,
-1.0, 1.0, 1.0,
-1.0, 1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, 1.0,
-1.0, -1.0, -1.0,
-1.0, 1.0, 1.0,
-1.0, -1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
1.0, 1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, -1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, 1.0,
1.0, -1.0, 1.0,
}
uvBufferData := [...]float32{
0.000059, 1.0 - 0.000004,
0.000103, 1.0 - 0.336048,
0.335973, 1.0 - 0.335903,
1.000023, 1.0 - 0.000013,
0.667979, 1.0 - 0.335851,
0.999958, 1.0 - 0.336064,
0.667979, 1.0 - 0.335851,
0.336024, 1.0 - 0.671877,
0.667969, 1.0 - 0.671889,
1.000023, 1.0 - 0.000013,
0.668104, 1.0 - 0.000013,
0.667979, 1.0 - 0.335851,
0.000059, 1.0 - 0.000004,
0.335973, 1.0 - 0.335903,
0.336098, 1.0 - 0.000071,
0.667979, 1.0 - 0.335851,
0.335973, 1.0 - 0.335903,
0.336024, 1.0 - 0.671877,
1.000004, 1.0 - 0.671847,
0.999958, 1.0 - 0.336064,
0.667979, 1.0 - 0.335851,
0.668104, 1.0 - 0.000013,
0.335973, 1.0 - 0.335903,
0.667979, 1.0 - 0.335851,
0.335973, 1.0 - 0.335903,
0.668104, 1.0 - 0.000013,
0.336098, 1.0 - 0.000071,
0.000103, 1.0 - 0.336048,
0.000004, 1.0 - 0.671870,
0.336024, 1.0 - 0.671877,
0.000103, 1.0 - 0.336048,
0.336024, 1.0 - 0.671877,
0.335973, 1.0 - 0.335903,
0.667969, 1.0 - 0.671889,
1.000004, 1.0 - 0.671847,
0.667979, 1.0 - 0.335851,
}
// Invert V because we're using a compressed texture
for i := 1; i < len(uvBufferData); i += 2 {
uvBufferData[i] = 1.0 - uvBufferData[i]
}
vertexBuffer := gl.GenBuffer()
defer vertexBuffer.Delete()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(vBufferData)*4, &vBufferData, gl.STATIC_DRAW)
uvBuffer := gl.GenBuffer()
defer uvBuffer.Delete()
uvBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(uvBufferData)*4, &uvBufferData, gl.STATIC_DRAW)
// Equivalent to a do... while
for ok := true; ok; ok = (window.GetKey(glfw.KeyEscape) != glfw.Press && !window.ShouldClose()) {
func() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
prog.Use()
defer gl.ProgramUnuse()
view, proj := camera.ComputeViewPerspective()
model := mgl32.Ident4()
MVP := proj.Mul4(view).Mul4(model)
//mvpArray := mvp.AsCMOArray(mathgl.FLOAT32).([16]float32)
matrixID.UniformMatrix4fv(false, MVP)
gl.ActiveTexture(gl.TEXTURE0)
texture.Bind(gl.TEXTURE_2D)
defer texture.Unbind(gl.TEXTURE_2D)
texSampler.Uniform1i(0)
vertexAttrib := gl.AttribLocation(0)
vertexAttrib.EnableArray()
defer vertexAttrib.DisableArray()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
defer vertexBuffer.Unbind(gl.ARRAY_BUFFER)
vertexAttrib.AttribPointer(3, gl.FLOAT, false, 0, nil)
uvAttrib := gl.AttribLocation(1)
uvAttrib.EnableArray()
defer uvAttrib.DisableArray()
uvBuffer.Bind(gl.ARRAY_BUFFER)
defer uvBuffer.Unbind(gl.ARRAY_BUFFER)
uvAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil)
gl.DrawArrays(gl.TRIANGLES, 0, 12*3)
window.SwapBuffers()
glfw.PollEvents()
}() // Defers unbinds and disables to here, end of the loop
}
}
func (this *Game) init() {
vs, err := NewShader(gl.VERTEX_SHADER, `#version 150
in vec4 position;
uniform mat4 cameraToClipMatrix;
void main()
{
gl_Position = cameraToClipMatrix * position;
}`)
if err != nil {
log.Printf("Error compiling vertex shader\n")
log.Println(err)
}
fs, err := NewShader(gl.FRAGMENT_SHADER, `#version 150
uniform vec4 color;
out vec4 outputF;
void main(void) {
outputF = color;
}`)
if err != nil {
log.Printf("Error compiling fragment shader\n")
log.Println(err)
}
program := NewProgram(vs, fs)
verts := make([]Vector4, 100)
sides := len(verts)
vert_scale := 1.0 / float64(sides)
TWO_PI := math.Pi * 2.0
for i := 0; i < sides; i++ {
angle := float64(i) * TWO_PI * vert_scale
verts[i] = Vector4{float32(math.Cos(angle)), float32(math.Sin(angle)), 0, 1}
}
vao := gl.GenVertexArray()
vao.Bind()
vbo := gl.GenBuffer()
vbo.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, int(reflect.TypeOf(Vector4{}).Size())*len(verts), verts, gl.STATIC_DRAW)
positionAttrib := program.GetAttribLocation("position")
positionAttrib.AttribPointer(4, gl.FLOAT, false, 0, nil)
positionAttrib.EnableArray()
vbo.Unbind(gl.ARRAY_BUFFER)
vao.Unbind()
cameraToClipMatrixUniform := program.GetUniformLocation("cameraToClipMatrix")
colorUniform := program.GetUniformLocation("color")
zNear := float32(0.0)
zFar := float32(45.0)
cameraToClipMatrix := ortho(0, float32(width), 0, float32(height), zNear, zFar)
this.program = program
this.vao = vao
this.cameraToClipMatrixUniform = cameraToClipMatrixUniform
this.cameraToClipMatrix = cameraToClipMatrix
this.colorUniform = colorUniform
this.text = gltext.NewFont("./PixelCarnageMono.ttf", 18, 64, float32(width), float32(height))
this.gameState = initialized
}
func main() {
runtime.LockOSThread()
if !glfw.Init() {
fmt.Fprintf(os.Stderr, "Can't open GLFW")
return
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Samples, 4)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True) // needed for macs
window, err := glfw.CreateWindow(1024, 768, "Tutorial 3", nil, nil)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
window.MakeContextCurrent()
gl.Init()
gl.GetError() // Ignore error
window.SetInputMode(glfw.StickyKeys, 1)
gl.ClearColor(0., 0., 0.4, 0.)
vertexArray := gl.GenVertexArray()
defer vertexArray.Delete()
vertexArray.Bind()
prog := helper.MakeProgram("SimpleTransform.vertexshader", "SingleColor.fragmentshader")
defer prog.Delete()
matrixID := prog.GetUniformLocation("MVP")
Projection := mgl32.Perspective(45.0, 4.0/3.0, 0.1, 100.0)
//Projection := mathgl.Identity(4,mathgl.FLOAT64)
//Projection := mathgl.Ortho2D(-5,5,-5,5)
View := mgl32.LookAt(4.0, 3.0, 3.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
//View := mathgl.Identity(4,mathgl.FLOAT64)
Model := mgl32.Ident4()
//Model := mathgl.Scale3D(2.,2.,2.).Mul(mathgl.HomogRotate3DX(25.0)).Mul(mathgl.Translate3D(.5,.2,-.7))
MVP := Projection.Mul4(View).Mul4(Model) // Remember, transform multiplication order is "backwards"
vBufferData := [...]float32{
-1., -1., 0.,
1., -1., 0.,
0., 1., 0.}
//elBufferData := [...]uint8{0, 1, 2} // Not sure why this is here
buffer := gl.GenBuffer()
defer buffer.Delete()
buffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(vBufferData)*4, &vBufferData, gl.STATIC_DRAW)
// Equivalent to a do... while
for ok := true; ok; ok = (window.GetKey(glfw.KeyEscape) != glfw.Press && !window.ShouldClose()) {
gl.Clear(gl.COLOR_BUFFER_BIT)
prog.Use()
matrixID.UniformMatrix4fv(false, MVP)
attribLoc := gl.AttribLocation(0)
attribLoc.EnableArray()
buffer.Bind(gl.ARRAY_BUFFER)
attribLoc.AttribPointer(3, gl.FLOAT, false, 0, nil)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
attribLoc.DisableArray()
window.SwapBuffers()
glfw.PollEvents()
}
}
func main() {
if err := glfw.Init(); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
defer glfw.Terminate()
glfw.OpenWindowHint(glfw.FsaaSamples, 4)
glfw.OpenWindowHint(glfw.OpenGLVersionMajor, 3)
glfw.OpenWindowHint(glfw.OpenGLVersionMinor, 3)
glfw.OpenWindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
if err := glfw.OpenWindow(1024, 768, 0, 0, 0, 0, 32, 0, glfw.Windowed); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
glfw.SetSwapInterval(0)
//gl.GlewExperimental(true)
gl.Init() // Can't find gl.GLEW_OK or any variation, not sure how to check if this worked
gl.GetError() // ignore error, since we're telling it to use CoreProfile above, we get "invalid enumerant" (GLError 1280) which freaks the OpenGLSentinel out
glfw.SetWindowTitle("Tutorial 07")
glfw.Enable(glfw.StickyKeys)
glfw.Disable(glfw.MouseCursor) // Not in the original tutorial, but IMO it SHOULD be there
glfw.SetMousePos(1024.0/2.0, 768.0/2.0)
gl.ClearColor(0., 0., 0.4, 0.)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.CULL_FACE)
camera := input.NewCamera()
vertexArray := gl.GenVertexArray()
defer vertexArray.Delete()
vertexArray.Bind()
prog := helper.MakeProgram("TransformVertexShader.vertexshader", "TextureFragmentShader.fragmentshader")
defer prog.Delete()
matrixID := prog.GetUniformLocation("MVP")
texture := helper.MakeTextureFromTGA("uvmap.tga") // Had to convert to tga, go-gl is missing the texture method for DDS right now
defer texture.Delete()
texSampler := prog.GetUniformLocation("myTextureSampler")
meshObj := objloader.LoadObject("cube.obj")
vertices, uvs := meshObj.Vertices, meshObj.UVs
vertexBuffer := gl.GenBuffer()
defer vertexBuffer.Delete()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*3*4, vertices, gl.STATIC_DRAW)
uvBuffer := gl.GenBuffer()
defer uvBuffer.Delete()
uvBuffer.Bind(gl.ARRAY_BUFFER)
// UV doesn't seem to care
gl.BufferData(gl.ARRAY_BUFFER, len(uvs)*2*4, uvs, gl.STATIC_DRAW)
// Equivalent to a do... while
for ok := true; ok; ok = (glfw.Key(glfw.KeyEsc) != glfw.KeyPress && glfw.WindowParam(glfw.Opened) == gl.TRUE && glfw.Key('Q') != glfw.KeyPress) {
func() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
prog.Use()
defer gl.ProgramUnuse()
view, proj := camera.ComputeViewPerspective()
model := mathgl.Ident4f()
MVP := proj.Mul4(view).Mul4(model)
matrixID.UniformMatrix4fv(false, MVP)
gl.ActiveTexture(gl.TEXTURE0)
texture.Bind(gl.TEXTURE_2D)
defer texture.Unbind(gl.TEXTURE_2D)
texSampler.Uniform1i(0)
vertexAttrib := gl.AttribLocation(0)
vertexAttrib.EnableArray()
defer vertexAttrib.DisableArray()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
defer vertexBuffer.Unbind(gl.ARRAY_BUFFER)
vertexAttrib.AttribPointer(3, gl.FLOAT, false, 0, nil)
uvAttrib := gl.AttribLocation(1)
uvAttrib.EnableArray()
defer uvAttrib.DisableArray()
uvBuffer.Bind(gl.ARRAY_BUFFER)
defer uvBuffer.Unbind(gl.ARRAY_BUFFER)
uvAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil)
gl.DrawArrays(gl.TRIANGLES, 0, len(vertices))
glfw.SwapBuffers()
}() // Defers unbinds and disables to here, end of the loop
}
}
func (ui *UIText) setString(text string) {
ui.text = text
if text == "" {
ui.buffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, 1, []byte{1}, gl.STATIC_DRAW)
return
}
l := len(text)
lt := l * 12
_ = lt
data := make([]float32, 20*l)
vertexCount := 0
texcoordsIndex := lt * 4
space := float32(0)
w, h := ui.GetPixelSize(text)
index := 0
for _, rune := range text {
spaceMult := float32(1)
if rune == '\t' {
rune = ' '
spaceMult = float32(index % ui.tabSize)
}
atlasImage := ui.Font.LetterInfo(rune)
if atlasImage == nil {
continue
}
yratio := atlasImage.RelativeHeight
xratio := atlasImage.RelativeWidth
//ygrid := -0.5 + (atlasImage.YGrid)
//xgrid := (-0.5 + (atlasImage.XGrid)) + space
ygrid := -(h / 2) + (atlasImage.YOffset)
xgrid := -(w / 2) + (atlasImage.XOffset) + space
space += atlasImage.XAdvance * spaceMult
vertexCount += 4
uv := engine.IndexUV(ui.Font, rune)
data[(index*12)+0] = xgrid
data[(index*12)+1] = ygrid
data[(index*12)+2] = 1
data[(index*12)+3] = (xratio) + xgrid
data[(index*12)+4] = ygrid
data[(index*12)+5] = 1
data[(index*12)+6] = (xratio) + xgrid
data[(index*12)+7] = (yratio) + ygrid
data[(index*12)+8] = 1
data[(index*12)+9] = xgrid
data[(index*12)+10] = (yratio) + ygrid
data[(index*12)+11] = 1
data[lt+(index*8)+0] = uv.U1
data[lt+(index*8)+1] = uv.V2
data[lt+(index*8)+2] = uv.U2
data[lt+(index*8)+3] = uv.V2
data[lt+(index*8)+4] = uv.U2
data[lt+(index*8)+5] = uv.V1
data[lt+(index*8)+6] = uv.U1
data[lt+(index*8)+7] = uv.V1
index++
}
ui.width = w
ui.height = h
ui.vertexCount = vertexCount
ui.texcoordsIndex = texcoordsIndex
ui.buffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(data)*4, data, gl.STATIC_DRAW)
}
func main() {
if err := glfw.Init(); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
defer glfw.Terminate()
glfw.OpenWindowHint(glfw.FsaaSamples, 4)
glfw.OpenWindowHint(glfw.OpenGLVersionMajor, 3)
glfw.OpenWindowHint(glfw.OpenGLVersionMinor, 3)
glfw.OpenWindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
if err := glfw.OpenWindow(1024, 768, 0, 0, 0, 0, 32, 0, glfw.Windowed); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
gl.Init()
gl.GetError() // Ignore error
glfw.SetWindowTitle("Tutorial 04")
glfw.Enable(glfw.StickyKeys)
gl.ClearColor(0., 0., 0.4, 0.)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
vertexArray := gl.GenVertexArray()
defer vertexArray.Delete()
vertexArray.Bind()
prog := helper.MakeProgram("TransformVertexShader.vertexshader", "ColorFragmentShader.fragmentshader")
defer prog.Delete()
matrixID := prog.GetUniformLocation("MVP")
Projection := mathgl.Perspective(45.0, 4.0/3.0, 0.1, 100.0)
View := mathgl.LookAt(4.0, 3.0, -3.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
Model := mathgl.Ident4f()
MVP := Projection.Mul4(View).Mul4(Model) // Remember, transform multiplication order is "backwards"
vBufferData := [...]float32{
-1.0, -1.0, -1.0,
-1.0, -1.0, 1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
-1.0, -1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, -1.0,
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
-1.0, -1.0, -1.0,
-1.0, -1.0, -1.0,
-1.0, 1.0, 1.0,
-1.0, 1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, 1.0,
-1.0, -1.0, -1.0,
-1.0, 1.0, 1.0,
-1.0, -1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
1.0, 1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, -1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, 1.0,
1.0, -1.0, 1.0}
colorBufferData := [...]float32{
0.583, 0.771, 0.014,
0.609, 0.115, 0.436,
0.327, 0.483, 0.844,
0.822, 0.569, 0.201,
0.435, 0.602, 0.223,
0.310, 0.747, 0.185,
0.597, 0.770, 0.761,
0.559, 0.436, 0.730,
0.359, 0.583, 0.152,
0.483, 0.596, 0.789,
0.559, 0.861, 0.639,
0.195, 0.548, 0.859,
0.014, 0.184, 0.576,
0.771, 0.328, 0.970,
0.406, 0.615, 0.116,
0.676, 0.977, 0.133,
0.971, 0.572, 0.833,
0.140, 0.616, 0.489,
0.997, 0.513, 0.064,
0.945, 0.719, 0.592,
0.543, 0.021, 0.978,
0.279, 0.317, 0.505,
0.167, 0.620, 0.077,
0.347, 0.857, 0.137,
0.055, 0.953, 0.042,
0.714, 0.505, 0.345,
0.783, 0.290, 0.734,
0.722, 0.645, 0.174,
0.302, 0.455, 0.848,
0.225, 0.587, 0.040,
0.517, 0.713, 0.338,
0.053, 0.959, 0.120,
0.393, 0.621, 0.362,
0.673, 0.211, 0.457,
0.820, 0.883, 0.371,
0.982, 0.099, 0.879}
//elBufferData := [...]uint8{0, 1, 2} // Not sure why this is here
vertexBuffer := gl.GenBuffer()
defer vertexBuffer.Delete()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(vBufferData)*4, &vBufferData, gl.STATIC_DRAW)
colorBuffer := gl.GenBuffer()
defer colorBuffer.Delete()
colorBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(colorBufferData)*4, &colorBufferData, gl.STATIC_DRAW)
// Equivalent to a do... while
for ok := true; ok; ok = (glfw.Key(glfw.KeyEsc) != glfw.KeyPress && glfw.WindowParam(glfw.Opened) == gl.TRUE) {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
prog.Use()
matrixID.UniformMatrix4fv(false, MVP)
vertexAttrib := gl.AttribLocation(0)
vertexAttrib.EnableArray()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
vertexAttrib.AttribPointer(3, gl.FLOAT, false, 0, nil)
colorAttrib := gl.AttribLocation(1)
colorAttrib.EnableArray()
colorBuffer.Bind(gl.ARRAY_BUFFER)
colorAttrib.AttribPointer(3, gl.FLOAT, false, 0, nil)
gl.DrawArrays(gl.TRIANGLES, 0, 12*3)
vertexAttrib.DisableArray()
colorAttrib.DisableArray()
glfw.SwapBuffers()
}
}
// buffer buffers the mesh data on the GPU.
// This calls glBufferData or glBufferSubData where appropriate.
func (a *Attr) buffer() {
switch v := a.data.(type) {
case []int8:
size := len(v) * a.stride
if size != a.gpuSize {
gl.BufferData(a.target, size, v, a.usage)
a.gpuSize = size
} else {
gl.BufferSubData(a.target, 0, size, v)
}
case []uint8:
size := len(v) * a.stride
if size != a.gpuSize {
gl.BufferData(a.target, size, v, a.usage)
a.gpuSize = size
} else {
gl.BufferSubData(a.target, 0, size, v)
}
case []int16:
size := len(v) * a.stride
if size != a.gpuSize {
gl.BufferData(a.target, size, v, a.usage)
a.gpuSize = size
} else {
gl.BufferSubData(a.target, 0, size, v)
}
case []uint16:
size := len(v) * a.stride
if size != a.gpuSize {
gl.BufferData(a.target, size, v, a.usage)
a.gpuSize = size
} else {
gl.BufferSubData(a.target, 0, size, v)
}
case []int32:
size := len(v) * a.stride
if size != a.gpuSize {
gl.BufferData(a.target, size, v, a.usage)
a.gpuSize = size
} else {
gl.BufferSubData(a.target, 0, size, v)
}
case []uint32:
size := len(v) * a.stride
if size != a.gpuSize {
gl.BufferData(a.target, size, v, a.usage)
a.gpuSize = size
} else {
gl.BufferSubData(a.target, 0, size, v)
}
case []float32:
size := len(v) * a.stride
if size != a.gpuSize {
gl.BufferData(a.target, size, v, a.usage)
a.gpuSize = size
} else {
gl.BufferSubData(a.target, 0, size, v)
}
case []float64:
size := len(v) * a.stride
if size != a.gpuSize {
gl.BufferData(a.target, size, v, a.usage)
a.gpuSize = size
} else {
gl.BufferSubData(a.target, 0, size, v)
}
}
a.invalid = false
}
func main() {
if err := glfw.Init(); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
defer glfw.Terminate()
glfw.OpenWindowHint(glfw.FsaaSamples, 4)
glfw.OpenWindowHint(glfw.OpenGLVersionMajor, 3)
glfw.OpenWindowHint(glfw.OpenGLVersionMinor, 3)
glfw.OpenWindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
if err := glfw.OpenWindow(1024, 768, 0, 0, 0, 0, 32, 0, glfw.Windowed); err != nil {
fmt.Fprintf(os.Stderr, "%s\n", err.Error())
return
}
//gl.GlewExperimental(true)
gl.Init() // Can't find gl.GLEW_OK or any variation, not sure how to check if this worked
gl.GetError() // ignore error, since we're telling it to use CoreProfile above, we get "invalid enumerant" (GLError 1280) which freaks the OpenGLSentinel out
// With go-gl we also apparently can't set glewExperimental
glfw.SetWindowTitle("Tutorial 05")
glfw.Enable(glfw.StickyKeys)
gl.ClearColor(0., 0., 0.4, 0.)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
vertexArray := gl.GenVertexArray()
defer vertexArray.Delete()
vertexArray.Bind()
prog := helper.MakeProgram("TransformVertexShader.vertexshader", "TextureFragmentShader.fragmentshader")
defer prog.Delete()
matrixID := prog.GetUniformLocation("MVP")
Projection := mathgl.Perspective(45.0, 4.0/3.0, 0.1, 100.0)
View := mathgl.LookAt(4.0, 3.0, 3.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)
Model := mathgl.Ident4f()
MVP := Projection.Mul4(View).Mul4(Model) // Remember, transform multiplication order is "backwards"
texture := helper.MakeTextureFromTGA("uvtemplate.tga")
defer texture.Delete()
texSampler := prog.GetUniformLocation("myTextureSampler")
vBufferData := [...]float32{
-1.0, -1.0, -1.0,
-1.0, -1.0, 1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
-1.0, -1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, -1.0,
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
-1.0, -1.0, -1.0,
-1.0, -1.0, -1.0,
-1.0, 1.0, 1.0,
-1.0, 1.0, -1.0,
1.0, -1.0, 1.0,
-1.0, -1.0, 1.0,
-1.0, -1.0, -1.0,
-1.0, 1.0, 1.0,
-1.0, -1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
1.0, -1.0, -1.0,
1.0, 1.0, -1.0,
1.0, -1.0, -1.0,
1.0, 1.0, 1.0,
1.0, -1.0, 1.0,
1.0, 1.0, 1.0,
1.0, 1.0, -1.0,
-1.0, 1.0, -1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, -1.0,
-1.0, 1.0, 1.0,
1.0, 1.0, 1.0,
-1.0, 1.0, 1.0,
1.0, -1.0, 1.0}
uvBufferData := [...]float32{
0.000059, 1.0 - 0.000004,
0.000103, 1.0 - 0.336048,
0.335973, 1.0 - 0.335903,
1.000023, 1.0 - 0.000013,
0.667979, 1.0 - 0.335851,
0.999958, 1.0 - 0.336064,
0.667979, 1.0 - 0.335851,
0.336024, 1.0 - 0.671877,
0.667969, 1.0 - 0.671889,
1.000023, 1.0 - 0.000013,
0.668104, 1.0 - 0.000013,
0.667979, 1.0 - 0.335851,
0.000059, 1.0 - 0.000004,
0.335973, 1.0 - 0.335903,
0.336098, 1.0 - 0.000071,
0.667979, 1.0 - 0.335851,
0.335973, 1.0 - 0.335903,
0.336024, 1.0 - 0.671877,
1.000004, 1.0 - 0.671847,
0.999958, 1.0 - 0.336064,
0.667979, 1.0 - 0.335851,
0.668104, 1.0 - 0.000013,
0.335973, 1.0 - 0.335903,
0.667979, 1.0 - 0.335851,
0.335973, 1.0 - 0.335903,
0.668104, 1.0 - 0.000013,
0.336098, 1.0 - 0.000071,
0.000103, 1.0 - 0.336048,
0.000004, 1.0 - 0.671870,
0.336024, 1.0 - 0.671877,
0.000103, 1.0 - 0.336048,
0.336024, 1.0 - 0.671877,
0.335973, 1.0 - 0.335903,
0.667969, 1.0 - 0.671889,
1.000004, 1.0 - 0.671847,
0.667979, 1.0 - 0.335851}
vertexBuffer := gl.GenBuffer()
defer vertexBuffer.Delete()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(vBufferData)*4, &vBufferData, gl.STATIC_DRAW)
uvBuffer := gl.GenBuffer()
defer uvBuffer.Delete()
uvBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(uvBufferData)*4, &uvBufferData, gl.STATIC_DRAW)
// Equivalent to a do... while
for ok := true; ok; ok = (glfw.Key(glfw.KeyEsc) != glfw.KeyPress && glfw.WindowParam(glfw.Opened) == gl.TRUE) {
func() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
prog.Use()
defer gl.ProgramUnuse()
matrixID.UniformMatrix4fv(false, MVP)
gl.ActiveTexture(gl.TEXTURE0)
texture.Bind(gl.TEXTURE_2D)
defer texture.Unbind(gl.TEXTURE_2D)
texSampler.Uniform1i(0)
vertexAttrib := gl.AttribLocation(0)
vertexAttrib.EnableArray()
defer vertexAttrib.DisableArray()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
defer vertexBuffer.Unbind(gl.ARRAY_BUFFER)
vertexAttrib.AttribPointer(3, gl.FLOAT, false, 0, nil)
uvAttrib := gl.AttribLocation(1)
uvAttrib.EnableArray()
defer uvAttrib.DisableArray()
uvBuffer.Bind(gl.ARRAY_BUFFER)
defer uvBuffer.Unbind(gl.ARRAY_BUFFER)
uvAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil)
gl.DrawArrays(gl.TRIANGLES, 0, 12*3)
glfw.SwapBuffers()
}() // Defers unbinds and disables to here, end of the loop
}
}
func main() {
runtime.LockOSThread()
if !glfw.Init() {
fmt.Fprintf(os.Stderr, "Can't open GLFW")
return
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Samples, 4)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True) // needed for macs
window, err := glfw.CreateWindow(1024, 768, "Tutorial 2", nil, nil)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
window.MakeContextCurrent()
gl.Init()
gl.GetError() // Ignore error
window.SetInputMode(glfw.StickyKeys, 1)
gl.ClearColor(0., 0., 0.4, 0.)
vBufferData := [...]float32{
-1., -1., 0.,
1., -1., 0.,
0., 1., 0.}
vertexArray := gl.GenVertexArray()
vertexArray.Bind()
prog := helper.MakeProgram("SimpleVertexShader.vertexshader", "SimpleFragmentShader.fragmentshader")
buffer := gl.GenBuffer()
buffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(vBufferData)*4, &vBufferData[0], gl.STATIC_DRAW)
// Equivalent to a do... while
for ok := true; ok; ok = (window.GetKey(glfw.KeyEscape) != glfw.Press && !window.ShouldClose()) {
gl.Clear(gl.COLOR_BUFFER_BIT)
prog.Use()
attribLoc := gl.AttribLocation(0)
attribLoc.EnableArray()
buffer.Bind(gl.ARRAY_BUFFER)
attribLoc.AttribPointer(3, gl.FLOAT, false, 0, nil)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
attribLoc.DisableArray()
window.SwapBuffers()
glfw.PollEvents()
}
}
func main() {
runtime.LockOSThread()
if !glfw.Init() {
fmt.Fprintf(os.Stderr, "Can't open GLFW")
return
}
defer glfw.Terminate()
glfw.WindowHint(glfw.Samples, 4)
glfw.WindowHint(glfw.ContextVersionMajor, 3)
glfw.WindowHint(glfw.ContextVersionMinor, 3)
glfw.WindowHint(glfw.OpenglProfile, glfw.OpenglCoreProfile)
glfw.WindowHint(glfw.OpenglForwardCompatible, glfw.True) // needed for macs
window, err := glfw.CreateWindow(1024, 768, "Tutorial 7", nil, nil)
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
return
}
window.MakeContextCurrent()
gl.Init()
gl.GetError() // Ignore error
window.SetInputMode(glfw.StickyKeys, 1)
window.SetCursorPosition(1024/2, 768/2)
window.SetInputMode(glfw.Cursor, glfw.CursorHidden)
gl.ClearColor(0., 0., 0.4, 0.)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.CULL_FACE)
camera := input.NewCamera(window)
vertexArray := gl.GenVertexArray()
defer vertexArray.Delete()
vertexArray.Bind()
prog := helper.MakeProgram("TransformVertexShader.vertexshader", "TextureFragmentShader.fragmentshader")
defer prog.Delete()
matrixID := prog.GetUniformLocation("MVP")
texture, err := helper.TextureFromDDS("uvmap.DDS")
if err != nil {
fmt.Println("Couldn't load texture")
return
}
defer texture.Delete()
texSampler := prog.GetUniformLocation("myTextureSampler")
meshObj := objloader.LoadObject("cube.obj", true)
vertices, uvs := meshObj.Vertices, meshObj.UVs
vertexBuffer := gl.GenBuffer()
defer vertexBuffer.Delete()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*3*4, vertices, gl.STATIC_DRAW)
uvBuffer := gl.GenBuffer()
defer uvBuffer.Delete()
uvBuffer.Bind(gl.ARRAY_BUFFER)
// UV doesn't seem to care
gl.BufferData(gl.ARRAY_BUFFER, len(uvs)*2*4, uvs, gl.STATIC_DRAW)
// Equivalent to a do... while
for ok := true; ok; ok = (window.GetKey(glfw.KeyEscape) != glfw.Press && !window.ShouldClose()) {
func() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
prog.Use()
defer gl.ProgramUnuse()
view, proj := camera.ComputeViewPerspective()
model := mgl32.Ident4()
MVP := proj.Mul4(view).Mul4(model)
matrixID.UniformMatrix4fv(false, MVP)
gl.ActiveTexture(gl.TEXTURE0)
texture.Bind(gl.TEXTURE_2D)
defer texture.Unbind(gl.TEXTURE_2D)
texSampler.Uniform1i(0)
vertexAttrib := gl.AttribLocation(0)
vertexAttrib.EnableArray()
defer vertexAttrib.DisableArray()
vertexBuffer.Bind(gl.ARRAY_BUFFER)
defer vertexBuffer.Unbind(gl.ARRAY_BUFFER)
vertexAttrib.AttribPointer(3, gl.FLOAT, false, 0, nil)
uvAttrib := gl.AttribLocation(1)
uvAttrib.EnableArray()
defer uvAttrib.DisableArray()
uvBuffer.Bind(gl.ARRAY_BUFFER)
defer uvBuffer.Unbind(gl.ARRAY_BUFFER)
uvAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil)
gl.DrawArrays(gl.TRIANGLES, 0, len(vertices))
window.SwapBuffers()
glfw.PollEvents()
}() // Defers unbinds and disables to here, end of the loop
}
}
