func ExampleRebase() {
parent1 := NewTransformStack()
scale := mgl32.Scale3D(2, 2, 2)
rot := mgl32.HomogRotate3DY(mgl32.DegToRad(90))
trans := mgl32.Translate3D(5, 5, 5)
parent1.Push(trans)
parent1.Push(rot)
parent1.Push(scale)
parent2 := parent1.Copy()
trans2 := mgl32.Translate3D(1, 1, 1)
rot2 := mgl32.HomogRotate3DX(mgl32.DegToRad(45))
parent1.Push(trans2)
parent1.Push(rot2)
// Replay the pushes the changes from parent1 after the copy onto parent2, as if
// they had been done on parent2 instead
parent2, err := Rebase(parent1, 4, parent2)
if err != nil {
panic(err)
}
// Now parent2 and parent 1 should be the same!
fmt.Println(parent2.Peek().ApproxEqualThreshold(parent1.Peek(), 1e-4))
// Output: true
}
func init() {
uvRotations = make(map[int]*mgl32.Mat4)
for i := 0; i < 4; i++ {
matrix := mgl32.Translate3D(0.5, 0.5, 0.0).
Mul4(mgl32.HomogRotate3DZ(float32(math.Pi * float32(i) / 2.0))).
Mul4(mgl32.Translate3D(-0.5, -0.5, 0.0))
uvRotations[i] = &matrix
}
}
func (k PianoKey) GetMtx() mgl32.Mat4 {
axis := mgl32.Vec3{1, 0, 0}
keyLen := float32(2.0)
if !k.white {
keyLen = 1.0
}
modelMtx := mgl32.Ident4()
modelMtx = modelMtx.Mul4(mgl32.Translate3D(k.Pos[0], k.Pos[1], k.Pos[2]-2))
modelMtx = modelMtx.Mul4(mgl32.HomogRotate3D(k.Angle, axis))
modelMtx = modelMtx.Mul4(mgl32.Translate3D(0, 0, keyLen))
modelMtx = modelMtx.Mul4(mgl32.Scale3D(0.5, 0.5, keyLen))
return modelMtx
}
func (b *blockBreakComponent) Update() {
if b.model != nil {
b.model.Free()
}
bounds := chunkMap.Block(b.Location.X, b.Location.Y, b.Location.Z).CollisionBounds()
tex := render.GetTexture(fmt.Sprintf("blocks/destroy_stage_%d", b.stage))
var verts []*render.StaticVertex
for _, bo := range bounds {
// Slightly bigger than the block to prevent clipping
bo = bo.Grow(0.01, 0.01, 0.01)
verts = appendBox(verts,
bo.Min.X(), bo.Min.Y(), bo.Min.Z(),
bo.Max.X()-bo.Min.X(), bo.Max.Y()-bo.Min.Y(), bo.Max.Z()-bo.Min.Z(),
[6]render.TextureInfo{
tex, tex, tex, tex, tex, tex,
})
}
b.model = render.NewStaticModel([][]*render.StaticVertex{verts})
b.model.Matrix[0] = mgl32.Translate3D(
float32(b.Location.X),
-float32(b.Location.Y),
float32(b.Location.Z),
)
}
func TestStackMultiPush(t *testing.T) {
stack := NewTransformStack()
scale := mgl32.Scale3D(2, 2, 2)
rot := mgl32.HomogRotate3DY(mgl32.DegToRad(90))
trans := mgl32.Translate3D(4, 5, 6)
stack.Push(trans)
stack.Push(rot)
if !stack.Peek().ApproxEqualThreshold(trans.Mul4(rot), 1e-4) {
t.Errorf("Stack does not multiply first two pushes correctly")
}
stack.Push(scale)
if !stack.Peek().ApproxEqualThreshold(trans.Mul4(rot).Mul4(scale), 1e-4) {
t.Errorf("Stack does not multiple third push correctly")
}
stack.Unwind(2)
stack.Push(scale)
if !stack.Peek().ApproxEqualThreshold(trans.Mul4(scale), 1e-4) {
t.Errorf("Unwinding and multiplying does not work correctly")
}
}
func onPaint(glctx gl.Context, sz size.Event) {
glctx.Viewport(0, 0, sz.WidthPx, sz.HeightPx)
glctx.ClearColor(0.5, 0.5, 0.5, 1)
glctx.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
glctx.UseProgram(program)
projectionMtx = mgl32.Perspective(45, float32(width)/float32(height), 0.1, 100)
arcBallMtx := arcball.getMtx()
glctx.UniformMatrix4fv(projection, projectionMtx[:])
glctx.UniformMatrix4fv(view, arcBallMtx[:])
glctx.BindBuffer(gl.ARRAY_BUFFER, triBuf)
glctx.EnableVertexAttribArray(position)
glctx.EnableVertexAttribArray(color)
glctx.EnableVertexAttribArray(normals)
vertSize := 4 * (coordsPerVertex + colorPerVertex + normalsPerVertex)
glctx.VertexAttribPointer(position, coordsPerVertex, gl.FLOAT, false, vertSize, 0)
glctx.VertexAttribPointer(color, colorPerVertex, gl.FLOAT, false, vertSize, 4*coordsPerVertex)
glctx.VertexAttribPointer(normals, normalsPerVertex, gl.FLOAT, false, vertSize, 4*(coordsPerVertex+colorPerVertex))
glctx.DepthMask(true)
glctx.Uniform3fv(lightPos, light.Pos[:])
glctx.Uniform3fv(lightIntensity, light.Intensities[:])
for _, k := range piano.Keys {
glctx.Uniform4fv(tint, k.Color[:])
mtx := k.GetMtx()
normMat := mtx.Mat3().Inv().Transpose()
glctx.UniformMatrix3fv(normalMatrix, normMat[:])
glctx.UniformMatrix4fv(model, mtx[:])
glctx.DrawArrays(gl.TRIANGLES, 0, len(triangleData)/vertSize)
}
modelMtx := mgl32.Ident4()
modelMtx = modelMtx.Mul4(mgl32.Translate3D(worldPos.X(), worldPos.Y(), worldPos.Z()))
modelMtx = modelMtx.Mul4(mgl32.Scale3D(0.5, 0.5, 0.5))
/*
glctx.Uniform4fv(tint, red[:])
// Disable depthmask so we dont get the pixel depth of the cursor cube
glctx.DepthMask(false)
glctx.UniformMatrix4fv(model, modelMtx[:])
glctx.DepthMask(true)
*/
glctx.DisableVertexAttribArray(position)
glctx.DisableVertexAttribArray(color)
glctx.DisableVertexAttribArray(normals)
fps.Draw(sz)
}
func renderCallback(delta float64) {
gl.Viewport(0, 0, int32(app.Width), int32(app.Height))
gl.ClearColor(0.196078, 0.6, 0.8, 1.0) // some pov-ray sky blue
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
// make the projection and view matrixes
projection := mgl.Perspective(mgl.DegToRad(60.0), float32(app.Width)/float32(app.Height), 1.0, 200.0)
view := app.CameraRotation.Mat4()
view = view.Mul4(mgl.Translate3D(-app.CameraPos[0], -app.CameraPos[1], -app.CameraPos[2]))
// draw the cube
cube.Node.Draw(projection, view)
// draw all of the bullets
for _, bullet := range bullets {
bullet.Node.Draw(projection, view)
}
// draw the backboard
backboard.Node.Draw(projection, view)
// draw the ground
ground.Draw(projection, view)
//time.Sleep(10 * time.Millisecond)
}
/* Update transform matrix and right/up/forward vectors */
func (t *Transform) Update(dt float32) {
// todo: avoid recalculating unless something has changed
/* Update transform */
rad := t.Rotation.Mul(math.Pi / 180.0) // translate rotaiton to radians
rotation := mgl.AnglesToQuat(rad[0], rad[1], rad[2], mgl.XYZ).Mat4()
scaling := mgl.Scale3D(t.Scale[0], t.Scale[1], t.Scale[2])
translation := mgl.Translate3D(t.Position[0], t.Position[1], t.Position[2])
/* New transform matrix: S * R * T */
//m := scaling.Mul4(rotation.Mul4(translation))
m := translation.Mul4(rotation.Mul4(scaling))
/* Grab axis vectors from transformation matrix */
t.Right[0] = m[4*0+0] // first column
t.Right[1] = m[4*1+0]
t.Right[2] = m[4*2+0]
t.Up[0] = m[4*0+1] // second column
t.Up[1] = m[4*1+1]
t.Up[2] = m[4*2+1]
t.Forward[0] = -m[4*0+2] // third column
t.Forward[1] = -m[4*1+2]
t.Forward[2] = -m[4*2+2]
/* Update transformation matrix */
t.Matrix = m
}
func (c SpritesheetFrameConfig) ToSpritesheetFrame() *SpritesheetFrame {
var (
texX = c.textureX / c.textureOriginalW
texY = c.textureY / c.textureOriginalH
texW = c.textureW / c.textureOriginalW
texH = c.textureH / c.textureOriginalH
)
var (
texMove = mgl32.Translate3D(texX, -texH-texY, 0.0)
texScale = mgl32.Scale3D(texW, texH, 1.0)
texRotate = mgl32.HomogRotate3DZ(mgl32.DegToRad(0))
texAdj = texMove.Mul4(texScale).Mul4(texRotate).Transpose()
)
var (
ptScale = mgl32.Scale3D(c.sourceW/c.pxPerUnit, c.sourceH/c.pxPerUnit, 1.0)
ptAdj = ptScale.Transpose()
)
return &SpritesheetFrame{
Frame: FrameConfig{
PointAdjustment: ptAdj,
TextureAdjustment: texAdj,
},
Width: c.sourceW / c.pxPerUnit,
Height: c.sourceH / c.pxPerUnit,
}
}
// GetTransformMat4 creates a transform matrix: scale * transform
func (r *Renderable) GetTransformMat4() mgl.Mat4 {
scaleMat := mgl.Scale3D(r.Scale[0], r.Scale[1], r.Scale[2])
transMat := mgl.Translate3D(r.Location[0], r.Location[1], r.Location[2])
localRotMat := r.LocalRotation.Mat4()
rotMat := r.Rotation.Mat4()
modelTransform := rotMat.Mul4(transMat).Mul4(localRotMat).Mul4(scaleMat)
return modelTransform
}
func (this *TextRenderer) TextTransform(vertex mathgl.Vec4) mathgl.Vec4 {
// apply font transforms
scale := float32(this.size) / 100.0
t := mathgl.Translate3D(curTotWidth, 0, 0).Mul4x1(vertex)
t = mathgl.Scale3D(scale, scale, 1).Mul4x1(t)
return t
}
func tickClouds(delta float64) {
if Client != nil && Client.WorldType != wtOverworld {
render.DrawClouds = false
if sunModel != nil {
sunModel.Free()
moonModel.Free()
sunModel = nil
moonModel = nil
}
return
}
render.DrawClouds = true
if Client == nil && Client.entity != nil {
return
}
if sunModel == nil {
genSunModel()
}
phase := int((Client.WorldAge / 24000) % 8)
if phase != moonPhase {
moonPhase = phase
genSunModel()
}
x, y, z := Client.entity.Position()
time := Client.WorldTime / 12000
ox := math.Cos(time*math.Pi) * 300
oy := math.Sin(time*math.Pi) * 300
sunModel.Matrix[0] = mgl32.Translate3D(
float32(x+ox),
-float32(y+oy),
float32(z),
).Mul4(mgl32.Rotate3DZ(-float32(time * math.Pi)).Mat4())
moonModel.Matrix[0] = mgl32.Translate3D(
float32(x-ox),
-float32(y-oy),
float32(z),
).Mul4(mgl32.Rotate3DZ(math.Pi - float32(time*math.Pi)).Mat4())
}
func (t *Transform2D) Update(dt float32) {
/* Update transform */
rad := t.Rotation * math.Pi / 180.0
rotation := mgl.AnglesToQuat(0, 0, rad, mgl.XYZ).Mat4()
scaling := mgl.Scale3D(t.Scale[0], t.Scale[1], 1)
translation := mgl.Translate3D(t.Position[0], t.Position[1], t.Position[2])
/* New transform matrix: S * R * T */
t.Matrix = scaling.Mul4(rotation.Mul4(translation))
}
func TestReseed(t *testing.T) {
stack := NewTransformStack()
scale := mgl32.Scale3D(2, 2, 2)
rot := mgl32.HomogRotate3DY(mgl32.DegToRad(90))
trans := mgl32.Translate3D(4, 5, 6)
stack.Push(trans)
stack.Push(rot)
stack.Push(scale)
trans2 := mgl32.Translate3D(1, 2, 3)
err := stack.Reseed(1, trans2)
if err != nil {
t.Fatalf("Rebase returned error when it should not %v", err)
}
if !stack.Peek().ApproxEqualThreshold(trans2.Mul4(rot).Mul4(scale), 1e-4) {
t.Fatalf("Rebase does not remultiply correctly. Got\n %v expected\n %v. (Previous state:\n %v)", stack.Peek(), trans2.Mul4(rot).Mul4(scale), trans.Mul4(rot).Mul4(scale))
}
}
func TestRebase(t *testing.T) {
stack := NewTransformStack()
stack2 := NewTransformStack()
scale := mgl32.Scale3D(2, 2, 2)
rot := mgl32.HomogRotate3DY(mgl32.DegToRad(90))
trans := mgl32.Translate3D(4, 5, 6)
trans2 := mgl32.Translate3D(1, 2, 3)
stack.Push(trans)
stack.Push(rot)
stack2.Push(trans2)
stack2.Push(scale)
out, _ := Rebase(stack2, 1, stack)
if !out.Peek().ApproxEqualThreshold(trans.Mul4(rot).Mul4(trans2).Mul4(scale), 1e-4) {
t.Log("\n", out)
t.Errorf("Rebase unsuccessful. Got\n %v, expected\n %v", out.Peek(), trans.Mul4(rot).Mul4(trans2).Mul4(scale))
}
}
func (r *BatchRenderer) Draw(batch *Batch, x, y, rot float32) error {
batch.Texture.Bind()
gl.BindBuffer(gl.ARRAY_BUFFER, batch.Buffer)
gl.EnableVertexAttribArray(r.PositionLoc)
gl.VertexAttribPointer(r.PositionLoc, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))
gl.EnableVertexAttribArray(r.TextureLoc)
gl.VertexAttribPointer(r.TextureLoc, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))
m := mgl32.Translate3D(x, y, 0.0).Mul4(mgl32.HomogRotate3DZ(rot))
gl.UniformMatrix4fv(r.ModelViewLoc, 1, false, &m[0])
gl.Uniform2f(r.TexOffsetLoc, batch.textureOffset.X(), batch.textureOffset.Y())
gl.DrawArrays(gl.TRIANGLES, 0, int32(batch.Count))
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
return nil
}
func (c Context) DrawRectangle(x, y, w, h float32, color Color) {
gl.UseProgram(c.program)
model := mgl32.Translate3D(x, y, 0).Mul4(mgl32.Scale3D(w, h, 0))
modelUniform := gl.GetUniformLocation(c.program, gl.Str("model\x00"))
gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])
colorArray := []float32{color.B, color.G, color.R}
colorUniform := gl.GetUniformLocation(c.program, gl.Str("color\x00"))
gl.Uniform4fv(colorUniform, 1, &colorArray[0])
gl.DrawArrays(gl.TRIANGLES, 0, 6)
}
func ExampleReseed() {
stack := NewTransformStack()
scale := mgl32.Scale3D(2, 2, 2)
rot := mgl32.HomogRotate3DY(mgl32.DegToRad(90))
trans := mgl32.Translate3D(4, 5, 6)
stack.Push(trans)
stack.Push(rot)
stack.Push(scale)
fmt.Println("Initial state:\n", stack.Peek())
trans2 := mgl32.Translate3D(1, 2, 3)
err := stack.Reseed(1, trans2)
if err == nil {
panic("Rebase failed")
}
fmt.Println("After rebase:\n", stack.Peek())
fmt.Println("Should be:\n", trans2.Mul4(rot).Mul4(scale))
}
// Render renders the bitmap with the center at given position
func (renderable *SimpleBitmapRenderable) Render(context *RenderContext, icons []PlacedIcon) {
gl := renderable.gl
renderable.withShader(func() {
renderable.setMatrix(renderable.viewMatrixUniform, context.ViewMatrix())
renderable.setMatrix(renderable.projectionMatrixUniform, context.ProjectionMatrix())
gl.EnableVertexAttribArray(uint32(renderable.vertexPositionAttrib))
gl.BindBuffer(opengl.ARRAY_BUFFER, renderable.vertexPositionBuffer)
gl.VertexAttribOffset(uint32(renderable.vertexPositionAttrib), 3, opengl.FLOAT, false, 0, 0)
gl.EnableVertexAttribArray(uint32(renderable.uvPositionAttrib))
gl.BindBuffer(opengl.ARRAY_BUFFER, renderable.uvPositionBuffer)
gl.VertexAttribOffset(uint32(renderable.uvPositionAttrib), 3, opengl.FLOAT, false, 0, 0)
textureUnit := int32(0)
gl.ActiveTexture(opengl.TEXTURE0 + uint32(textureUnit))
gl.BindTexture(opengl.TEXTURE_2D, renderable.paletteTexture.Handle())
gl.Uniform1i(renderable.paletteUniform, textureUnit)
textureUnit = 1
gl.ActiveTexture(opengl.TEXTURE0 + uint32(textureUnit))
gl.Uniform1i(renderable.bitmapUniform, textureUnit)
for _, icon := range icons {
x, y := icon.Center()
u, v := icon.Icon().UV()
width, height := renderable.limitedSize(icon)
modelMatrix := mgl.Ident4().
Mul4(mgl.Translate3D(x, y, 0.0)).
Mul4(mgl.Scale3D(width, height, 1.0))
renderable.setMatrix(renderable.modelMatrixUniform, &modelMatrix)
var uv = []float32{
0.0, 0.0, 0.0,
u, 0.0, 0.0,
u, v, 0.0,
u, v, 0.0,
0.0, v, 0.0,
0.0, 0.0, 0.0}
gl.BindBuffer(opengl.ARRAY_BUFFER, renderable.uvPositionBuffer)
gl.BufferData(opengl.ARRAY_BUFFER, len(uv)*4, uv, opengl.STATIC_DRAW)
gl.BindTexture(opengl.TEXTURE_2D, icon.Icon().Handle())
gl.DrawArrays(opengl.TRIANGLES, 0, 6)
}
gl.BindTexture(opengl.TEXTURE_2D, 0)
})
}
// NewTextureRenderable returns a new instance of a texture renderable
func NewTextureRenderable(gl opengl.OpenGl, positionX, positionY float32, displaySize float32,
paletteTexture graphics.Texture, bitmapTexture graphics.Texture) *TextureRenderable {
vertexShader, err1 := opengl.CompileNewShader(gl, opengl.VERTEX_SHADER, textureVertexShaderSource)
defer gl.DeleteShader(vertexShader)
fragmentShader, err2 := opengl.CompileNewShader(gl, opengl.FRAGMENT_SHADER, textureFragmentShaderSource)
defer gl.DeleteShader(fragmentShader)
program, _ := opengl.LinkNewProgram(gl, vertexShader, fragmentShader)
if err1 != nil {
fmt.Fprintf(os.Stderr, "Failed to compile shader 1:\n", err1)
}
if err2 != nil {
fmt.Fprintf(os.Stderr, "Failed to compile shader 2:\n", err2)
}
renderable := &TextureRenderable{
gl: gl,
program: program,
modelMatrix: mgl.Ident4().
Mul4(mgl.Translate3D(positionX, positionY, 0.0)).
Mul4(mgl.Scale3D(displaySize, displaySize, 1.0)),
vertexArrayObject: gl.GenVertexArrays(1)[0],
vertexPositionBuffer: gl.GenBuffers(1)[0],
vertexPositionAttrib: gl.GetAttribLocation(program, "vertexPosition"),
modelMatrixUniform: gl.GetUniformLocation(program, "modelMatrix"),
viewMatrixUniform: gl.GetUniformLocation(program, "viewMatrix"),
projectionMatrixUniform: gl.GetUniformLocation(program, "projectionMatrix"),
paletteTexture: paletteTexture,
paletteUniform: gl.GetUniformLocation(program, "palette"),
bitmapTexture: bitmapTexture,
bitmapUniform: gl.GetUniformLocation(program, "bitmap")}
renderable.withShader(func() {
gl.BindBuffer(opengl.ARRAY_BUFFER, renderable.vertexPositionBuffer)
limit := float32(1.0)
var vertices = []float32{
0.0, 0.0, 0.0,
limit, 0.0, 0.0,
limit, limit, 0.0,
limit, limit, 0.0,
0.0, limit, 0.0,
0.0, 0.0, 0.0}
gl.BufferData(opengl.ARRAY_BUFFER, len(vertices)*4, vertices, opengl.STATIC_DRAW)
})
return renderable
}
func (this *Transform) GetUpdatedModel() mathgl.Mat4 {
Model := this.model
Model = Model.Mul4(mathgl.Translate3D(float32(this.X), float32(this.Y), float32(this.Z)))
// Model = Model.Mul4(mathgl.HomogRotate3DZ(float32(s.rot)))
// Model = Model.Mul4(mathgl.HomogRotate3D(s.Rot, mathgl.Vec3{s.XR, s.YR, s.ZR}))
// Euler rotation is easy.. no quaternions yet.. what a pain.
Model = Model.Mul4(mathgl.Rotate3DX(this.XR * this.Rot).Mat4())
Model = Model.Mul4(mathgl.Rotate3DY(this.YR * this.Rot).Mat4())
Model = Model.Mul4(mathgl.Rotate3DZ(this.ZR * this.Rot).Mat4())
Model = Model.Mul4(mathgl.Scale3D(float32(this.XS), float32(this.YS), float32(this.ZS)))
return Model
}
// Draw will draw the billvboard in the x,y and z
func (billboard *Billboard) Draw(x float32, y float32, z float32) {
model := mgl32.Translate3D(x, y, z)
if shader := shader.GetActive(); shader != nil {
gl.UniformMatrix4fv(shader.Model, 1, false, &model[0])
}
gl.BindVertexArray(billboard.vao)
gl.ActiveTexture(gl.TEXTURE0)
gl.BindTexture(gl.TEXTURE_2D, billboard.image)
gl.DrawArrays(gl.TRIANGLES, 0, 1*2*3)
}
func (i *Instance) GetModel() mgl32.Mat4 {
if i.dirty {
var model mgl32.Mat4
model = mgl32.Translate3D(
i.position.X(),
i.position.Y(),
i.position.Z(),
)
model = model.Mul4(mgl32.HomogRotate3DZ(mgl32.DegToRad(i.rotation)))
model = model.Mul4(mgl32.Scale3D(i.scale.X(), i.scale.Y(), i.scale.Z()))
i.model = model
i.dirty = false
}
return i.model
}
// DrawFrame will draw the sprite in the x,y and z with the specified frame from a spritesheet
func (sprite *Sprite) DrawFrame(x float32, y float32, z float32, scale float32, frame int) {
model := mgl32.Translate3D(x, y, z)
model = model.Mul4(mgl32.Scale3D(scale, scale, 1))
// remember this is in radians!
// model = model.Mul4(mgl32.HomogRotate3D(mgl32.DegToRad(90), mgl32.Vec3{0, 0, 1}))
if shader := shader.GetActive(); shader != nil {
gl.UniformMatrix4fv(shader.Model, 1, false, &model[0])
}
gl.BindVertexArray(sprite.vao)
sprite.image.Bind()
gl.DrawArrays(gl.TRIANGLES, int32(frame*6), 6)
}
// Render renders
func (renderable *TileSelectionRenderable) Render(context *RenderContext) {
gl := renderable.gl
renderable.withShader(func() {
renderable.setMatrix32(renderable.viewMatrixUniform, context.ViewMatrix())
renderable.setMatrix32(renderable.projectionMatrixUniform, context.ProjectionMatrix())
gl.BindBuffer(opengl.ARRAY_BUFFER, renderable.vertexPositionBuffer)
gl.VertexAttribOffset(uint32(renderable.vertexPositionAttrib), 3, opengl.FLOAT, false, 0, 0)
renderable.query(func(coord editormodel.TileCoordinate) {
x, y := coord.XY()
modelMatrix := mgl.Translate3D(float32(x)*32.0, float32(63-y)*32.0, 0.0)
renderable.setMatrix32(renderable.modelMatrixUniform, &modelMatrix)
gl.DrawArrays(opengl.TRIANGLES, 0, 6)
})
})
}
// Render renders the highlight.
func (highlighter *BasicHighlighter) Render(context *RenderContext, areas []Area) {
gl := highlighter.gl
highlighter.withShader(func() {
highlighter.setMatrix(highlighter.viewMatrixUniform, context.ViewMatrix())
highlighter.setMatrix(highlighter.projectionMatrixUniform, context.ProjectionMatrix())
gl.BindBuffer(opengl.ARRAY_BUFFER, highlighter.vertexPositionBuffer)
gl.VertexAttribOffset(uint32(highlighter.vertexPositionAttrib), 3, opengl.FLOAT, false, 0, 0)
for _, area := range areas {
x, y := area.Center()
width, height := area.Size()
modelMatrix := mgl.Ident4().
Mul4(mgl.Translate3D(x, y, 0.0)).
Mul4(mgl.Scale3D(width, height, 1.0))
highlighter.setMatrix(highlighter.modelMatrixUniform, &modelMatrix)
gl.DrawArrays(opengl.TRIANGLES, 0, 6)
}
})
}
// NewTextRenderable returns a new instance of a text renderable
func NewTextRenderable(gl opengl.OpenGl, positionX, positionY float32, displaySize float32,
paletteTexture graphics.Texture) *TextRenderable {
vertexShader, err1 := opengl.CompileNewShader(gl, opengl.VERTEX_SHADER, textVertexShaderSource)
defer gl.DeleteShader(vertexShader)
fragmentShader, err2 := opengl.CompileNewShader(gl, opengl.FRAGMENT_SHADER, textFragmentShaderSource)
defer gl.DeleteShader(fragmentShader)
program, _ := opengl.LinkNewProgram(gl, vertexShader, fragmentShader)
if err1 != nil {
fmt.Fprintf(os.Stderr, "Failed to compile shader 1:\n", err1)
}
if err2 != nil {
fmt.Fprintf(os.Stderr, "Failed to compile shader 2:\n", err2)
}
renderable := &TextRenderable{
gl: gl,
program: program,
modelMatrix: mgl.Ident4().
Mul4(mgl.Translate3D(positionX, positionY, 0.0)).
Mul4(mgl.Scale3D(displaySize, displaySize, 1.0)),
vertexArrayObject: gl.GenVertexArrays(1)[0],
vertexPositionBuffer: gl.GenBuffers(1)[0],
vertexPositionAttrib: gl.GetAttribLocation(program, "vertexPosition"),
uvPositionBuffer: gl.GenBuffers(1)[0],
uvPositionAttrib: gl.GetAttribLocation(program, "uvPosition"),
modelMatrixUniform: gl.GetUniformLocation(program, "modelMatrix"),
viewMatrixUniform: gl.GetUniformLocation(program, "viewMatrix"),
projectionMatrixUniform: gl.GetUniformLocation(program, "projectionMatrix"),
paletteTexture: paletteTexture,
paletteUniform: gl.GetUniformLocation(program, "palette"),
bitmapUniform: gl.GetUniformLocation(program, "bitmap"),
text: ""}
return renderable
}
func (cam *LimitedCamera) updateViewMatrix() {
scaleFactor := cam.scaleFactor()
cam.viewMatrix = mgl.Ident4().
Mul4(mgl.Scale3D(scaleFactor, scaleFactor, 1.0)).
Mul4(mgl.Translate3D(cam.viewOffsetX, cam.viewOffsetY, 0))
}
func programLoop(window *win.Window) error {
// the linked shader program determines how the data will be rendered
vertShader, err := gfx.NewShaderFromFile("shaders/phong.vert", gl.VERTEX_SHADER)
if err != nil {
return err
}
fragShader, err := gfx.NewShaderFromFile("shaders/phong.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
program, err := gfx.NewProgram(vertShader, fragShader)
if err != nil {
return err
}
defer program.Delete()
lightFragShader, err := gfx.NewShaderFromFile("shaders/light.frag", gl.FRAGMENT_SHADER)
if err != nil {
return err
}
// special shader program so that lights themselves are not affected by lighting
lightProgram, err := gfx.NewProgram(vertShader, lightFragShader)
if err != nil {
return err
}
VAO := createVAO(cubeVertices, nil)
lightVAO := createVAO(cubeVertices, nil)
// ensure that triangles that are "behind" others do not draw over top of them
gl.Enable(gl.DEPTH_TEST)
camera := cam.NewFpsCamera(mgl32.Vec3{0, 0, 3}, mgl32.Vec3{0, 1, 0}, -90, 0, window.InputManager())
for !window.ShouldClose() {
// swaps in last buffer, polls for window events, and generally sets up for a new render frame
window.StartFrame()
// update camera position and direction from input evevnts
camera.Update(window.SinceLastFrame())
// background color
gl.ClearColor(0, 0, 0, 1.0)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) // depth buffer needed for DEPTH_TEST
// cube rotation matrices
rotateX := (mgl32.Rotate3DX(mgl32.DegToRad(-45 * float32(glfw.GetTime()))))
rotateY := (mgl32.Rotate3DY(mgl32.DegToRad(-45 * float32(glfw.GetTime()))))
rotateZ := (mgl32.Rotate3DZ(mgl32.DegToRad(-45 * float32(glfw.GetTime()))))
// creates perspective
fov := float32(60.0)
projectTransform := mgl32.Perspective(mgl32.DegToRad(fov),
float32(window.Width())/float32(window.Height()),
0.1,
100.0)
camTransform := camera.GetTransform()
lightPos := mgl32.Vec3{0.6, 1, 0.1}
lightTransform := mgl32.Translate3D(lightPos.X(), lightPos.Y(), lightPos.Z()).Mul4(
mgl32.Scale3D(0.2, 0.2, 0.2))
program.Use()
gl.UniformMatrix4fv(program.GetUniformLocation("view"), 1, false, &camTransform[0])
gl.UniformMatrix4fv(program.GetUniformLocation("project"), 1, false,
&projectTransform[0])
gl.BindVertexArray(VAO)
// draw each cube after all coordinate system transforms are bound
// obj is colored, light is white
gl.Uniform3f(program.GetUniformLocation("material.ambient"), 1.0, 0.5, 0.31)
gl.Uniform3f(program.GetUniformLocation("material.diffuse"), 1.0, 0.5, 0.31)
gl.Uniform3f(program.GetUniformLocation("material.specular"), 0.5, 0.5, 0.5)
gl.Uniform1f(program.GetUniformLocation("material.shininess"), 32.0)
lightColor := mgl32.Vec3{
float32(math.Sin(glfw.GetTime() * 1)),
float32(math.Sin(glfw.GetTime() * 0.35)),
float32(math.Sin(glfw.GetTime() * 0.65)),
}
diffuseColor := mgl32.Vec3{
0.5 * lightColor[0],
0.5 * lightColor[1],
0.5 * lightColor[2],
}
ambientColor := mgl32.Vec3{
0.2 * lightColor[0],
0.2 * lightColor[1],
0.2 * lightColor[2],
}
gl.Uniform3f(program.GetUniformLocation("light.ambient"),
ambientColor[0], ambientColor[1], ambientColor[2])
gl.Uniform3f(program.GetUniformLocation("light.diffuse"),
diffuseColor[0], diffuseColor[1], diffuseColor[2])
gl.Uniform3f(program.GetUniformLocation("light.specular"), 1.0, 1.0, 1.0)
gl.Uniform3f(program.GetUniformLocation("light.position"), lightPos.X(), lightPos.Y(), lightPos.Z())
for _, pos := range cubePositions {
// turn the cubes into rectangular prisms for more fun
worldTranslate := mgl32.Translate3D(pos[0], pos[1], pos[2])
worldTransform := worldTranslate.Mul4(
rotateX.Mul3(rotateY).Mul3(rotateZ).Mat4(),
)
gl.UniformMatrix4fv(program.GetUniformLocation("model"), 1, false,
&worldTransform[0])
gl.DrawArrays(gl.TRIANGLES, 0, 36)
}
gl.BindVertexArray(0)
// Draw the light obj after the other boxes using its separate shader program
// this means that we must re-bind any uniforms
lightProgram.Use()
gl.BindVertexArray(lightVAO)
gl.UniformMatrix4fv(lightProgram.GetUniformLocation("model"), 1, false, &lightTransform[0])
gl.UniformMatrix4fv(lightProgram.GetUniformLocation("view"), 1, false, &camTransform[0])
gl.UniformMatrix4fv(lightProgram.GetUniformLocation("project"), 1, false, &projectTransform[0])
gl.DrawArrays(gl.TRIANGLES, 0, 36)
gl.BindVertexArray(0)
// end of draw loop
}
return nil
}
func (cube *Cube) Translate(Tx, Ty, Tz float32) {
cube.Model = cube.Model.Mul4(mgl32.Translate3D(Tx, Ty, Tz))
}