// Since go has multiple return values, I just went ahead and made it return the view and perspective matrices (in that order) rather than messing with getter methods
func (c *Camera) ComputeViewPerspective() (mathgl.Mat4f, mathgl.Mat4f) {
if mathgl.FloatEqual(-1.0, c.time) {
c.time = glfw.Time()
}
currTime := glfw.Time()
deltaT := currTime - c.time
xPos, yPos := glfw.MousePos()
glfw.SetMousePos(width/2.0, height/2.0)
c.hAngle += mouseSpeed * ((width / 2.0) - float64(xPos))
c.vAngle += mouseSpeed * ((height / 2.0) - float64(yPos))
dir := mathgl.Vec3f{
float32(math.Cos(c.vAngle) * math.Sin(c.hAngle)),
float32(math.Sin(c.vAngle)),
float32(math.Cos(c.vAngle) * math.Cos(c.hAngle))}
right := mathgl.Vec3f{
float32(math.Sin(c.hAngle - math.Pi/2.0)),
0.0,
float32(math.Cos(c.hAngle - math.Pi/2.0))}
up := right.Cross(dir)
if glfw.Key(glfw.KeyUp) == glfw.KeyPress || glfw.Key('W') == glfw.KeyPress {
c.pos = c.pos.Add(dir.Mul(float32(deltaT * speed)))
}
if glfw.Key(glfw.KeyDown) == glfw.KeyPress || glfw.Key('S') == glfw.KeyPress {
c.pos = c.pos.Sub(dir.Mul(float32(deltaT * speed)))
}
if glfw.Key(glfw.KeyRight) == glfw.KeyPress || glfw.Key('D') == glfw.KeyPress {
c.pos = c.pos.Add(right.Mul(float32(deltaT * speed)))
}
if glfw.Key(glfw.KeyLeft) == glfw.KeyPress || glfw.Key('A') == glfw.KeyPress {
c.pos = c.pos.Sub(right.Mul(float32(deltaT * speed)))
}
// Adding to the original tutorial, Space goes up
if glfw.Key(glfw.KeySpace) == glfw.KeyPress {
c.pos = c.pos.Add(up.Mul(float32(deltaT * speed)))
}
// Adding to the original tutorial, left control goes down
if glfw.Key(glfw.KeyLctrl) == glfw.KeyPress {
c.pos = c.pos.Sub(up.Mul(float32(deltaT * speed)))
}
fov := initialFOV - 5.0*float64(glfw.MouseWheel())
proj := mathgl.Perspective(fov, 4.0/3.0, 0.1, 100.0)
view := mathgl.LookAtV(c.pos, c.pos.Add(dir), up)
c.time = currTime
return view, proj
}
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() {
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()
}
}
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 03")
glfw.Enable(glfw.StickyKeys)
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 := mathgl.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 := mathgl.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 := mathgl.Ident4f()
//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 = (glfw.Key(glfw.KeyEsc) != glfw.KeyPress && glfw.WindowParam(glfw.Opened) == gl.TRUE) {
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()
glfw.SwapBuffers()
}
}