Golang mgl32.HomogRotate3D函数代码示例

func (e *Engine) Draw(c size.Event) {

	gl.Enable(gl.DEPTH_TEST)
	gl.DepthFunc(gl.LESS)

	gl.ClearColor(0.5, 0.8, 0.8, 1)
	gl.Clear(gl.COLOR_BUFFER_BIT)
	gl.Clear(gl.DEPTH_BUFFER_BIT)

	gl.UseProgram(e.shader.program)

	gl.Uniform3fv(e.shader.lightdir, []float32{0.5, 0.6, 0.7})

	m := mgl32.Perspective(1.3, float32(c.WidthPt/c.HeightPt), 0.1, 10.0)
	gl.UniformMatrix4fv(e.shader.projectionmatrix, m[:])

	eye := mgl32.Vec3{0, 0, 0.2}
	center := mgl32.Vec3{0, 0, 0}
	up := mgl32.Vec3{0, 1, 0}

	m = mgl32.LookAtV(eye, center, up)
	gl.UniformMatrix4fv(e.shader.viewmatrix, m[:])

	m = mgl32.HomogRotate3D((e.touchx/float32(c.WidthPt)-0.5)*6.28, mgl32.Vec3{0, 1, 0})
	gl.UniformMatrix4fv(e.shader.modelmatrix, m[:])

	m = mgl32.HomogRotate3D((e.touchx/float32(c.WidthPt)-0.5)*6.28, mgl32.Vec3{0, -1, 0})
	gl.UniformMatrix4fv(e.shader.lightmatrix, m[:])

	coordsPerVertex := 3
	for _, obj := range e.shape.Objs {
		gl.BindBuffer(gl.ARRAY_BUFFER, obj.coord)
		gl.EnableVertexAttribArray(e.shader.vertCoord)
		gl.VertexAttribPointer(e.shader.vertCoord, coordsPerVertex, gl.FLOAT, false, 12, 0)

		texCoordsPerVertex := 2
		gl.BindBuffer(gl.ARRAY_BUFFER, obj.uvcoord)
		gl.EnableVertexAttribArray(e.shader.texcoord)
		gl.VertexAttribPointer(e.shader.texcoord, texCoordsPerVertex, gl.FLOAT, false, 8, 0)

		gl.BindBuffer(gl.ARRAY_BUFFER, obj.normal)
		gl.EnableVertexAttribArray(e.shader.normal)
		gl.VertexAttribPointer(e.shader.normal, 3, gl.FLOAT, false, 12, 0)

		gl.BindTexture(gl.TEXTURE_2D, obj.tex)

		gl.DrawArrays(gl.TRIANGLES, 0, obj.vcount)

		gl.DisableVertexAttribArray(e.shader.texcoord)
		gl.DisableVertexAttribArray(e.shader.normal)
		gl.DisableVertexAttribArray(e.shader.vertCoord)
	}

	debug.DrawFPS(c)
}

func (e *Engine) Draw(c size.Event) {

	gl.Enable(gl.DEPTH_TEST)
	gl.DepthFunc(gl.LESS)

	gl.ClearColor(0.2, 0.2, 0.2, 1)
	gl.Clear(gl.COLOR_BUFFER_BIT)
	gl.Clear(gl.DEPTH_BUFFER_BIT)

	gl.UseProgram(e.shader.program)

	m := mgl32.Perspective(0.785, float32(c.WidthPt/c.HeightPt), 0.1, 10.0)
	gl.UniformMatrix4fv(e.shader.projection, m[:])

	eye := mgl32.Vec3{0, 0, 8}
	center := mgl32.Vec3{0, 0, 0}
	up := mgl32.Vec3{0, 1, 0}

	m = mgl32.LookAtV(eye, center, up)
	gl.UniformMatrix4fv(e.shader.view, m[:])

	m = mgl32.HomogRotate3D(float32(e.touchLoc.X/c.WidthPt-0.5)*3.14*2, mgl32.Vec3{0, 1, 0})
	gl.UniformMatrix4fv(e.shader.modelx, m[:])

	m = mgl32.HomogRotate3D(float32(e.touchLoc.Y/c.HeightPt-0.5)*3.14, mgl32.Vec3{1, 0, 0})
	gl.UniformMatrix4fv(e.shader.modely, m[:])

	coordsPerVertex := 3
	for _, obj := range e.shape.Objs {
		gl.BindBuffer(gl.ARRAY_BUFFER, obj.coord)
		gl.EnableVertexAttribArray(e.shader.vertCoord)

		gl.VertexAttribPointer(e.shader.vertCoord, coordsPerVertex, gl.FLOAT, false, 12, 0)

		if obj.useuv == true {
			gl.Uniform1i(e.shader.useuv, 1)
			texCoordsPerVertex := 2
			gl.BindBuffer(gl.ARRAY_BUFFER, obj.uvcoord)
			gl.EnableVertexAttribArray(e.shader.vertTexCoord)
			gl.VertexAttribPointer(e.shader.vertTexCoord, texCoordsPerVertex, gl.FLOAT, false, 8, 0)

			gl.BindTexture(gl.TEXTURE_2D, obj.tex)
		} else {
			gl.Uniform1i(e.shader.useuv, 0)
			gl.Uniform4f(e.shader.color, obj.color[0], obj.color[1], obj.color[2], obj.color[3])
		}
		gl.DrawArrays(gl.TRIANGLES, 0, obj.vcount)
		if obj.useuv {
			gl.DisableVertexAttribArray(e.shader.vertTexCoord)
		}
		gl.DisableVertexAttribArray(e.shader.vertCoord)
	}

	debug.DrawFPS(c)
}

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 (e *Engine) Draw(c event.Config) {
	since := time.Now().Sub(e.started)

	gl.Enable(gl.DEPTH_TEST)
	gl.DepthFunc(gl.LESS)

	gl.ClearColor(0, 0, 0, 1)
	gl.Clear(gl.COLOR_BUFFER_BIT)
	gl.Clear(gl.DEPTH_BUFFER_BIT)

	gl.UseProgram(e.shader.program)

	// Setup MVP
	var m mgl.Mat4
	m = mgl.Perspective(0.785, float32(c.Width/c.Height), 0.1, 10.0)
	gl.UniformMatrix4fv(e.shader.projection, m[:])

	m = mgl.LookAtV(
		mgl.Vec3{3, 3, 3}, // eye
		mgl.Vec3{0, 0, 0}, // center
		mgl.Vec3{0, 1, 0}, // up
	)
	gl.UniformMatrix4fv(e.shader.view, m[:])

	m = mgl.HomogRotate3D(float32(since.Seconds()), mgl.Vec3{0, 1, 0})
	gl.UniformMatrix4fv(e.shader.model, m[:])

	// Draw our shape
	gl.BindBuffer(gl.ARRAY_BUFFER, e.shape.buf)

	gl.EnableVertexAttribArray(e.shader.vertCoord)
	gl.VertexAttribPointer(e.shader.vertCoord, e.shape.coordsPerVertex, gl.FLOAT, false, 20, 0) // 4 bytes in float, 5 values per vertex

	gl.EnableVertexAttribArray(e.shader.vertTexCoord)
	gl.VertexAttribPointer(e.shader.vertTexCoord, e.shape.texCoordsPerVertex, gl.FLOAT, false, 20, 12)

	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, e.shape.texture)

	gl.DrawArrays(gl.TRIANGLES, 0, e.shape.vertexCount)

	gl.DisableVertexAttribArray(e.shader.vertCoord)

	//debug.DrawFPS(c)
}

func Loop() bool {
	if !llgl.EventLoop() {
		return false
	}

	ratio := llgl.ResizeViewport()
	if ratio != 0 {
		state.projection = mgl.Perspective(mgl.DegToRad(45.0), ratio, 0.1, 10.0)
		glstate.projectionUL.SetMat4(state.projection)
	}

	state.angle += 0.001
	state.model = mgl.HomogRotate3D(float32(state.angle), mgl.Vec3{1, 0, 0})
	glstate.modelUL.SetMat4(state.model)

	llgl.Clear()
	for i := 0; i < 1*10; i++ {
		llgl.DrawTriangleArray(0, int32(len(state.data)/5))
	}

	fpsCounter.TickAndLog()
	llgl.SwapBuffers()
	return true
}

// Update updates the model
func (m *Model) Update(elapsed float64) {
	m.angle += elapsed
	m.model = mgl32.HomogRotate3D(float32(m.angle), mgl32.Vec3{0, 1, 0})
}

func (camera *Camera) Rotate(angle float32, axis mgl32.Vec3) {
	camera.Model = camera.Model.Mul4(mgl32.HomogRotate3D(angle, axis))
}

//SetQuatRotate will reset this transform to represent the rotation represented by this (angle,quat).
func (t *Transform) SetQuatRotate(angle float32, axis glm.Vec3) {
	t.LocalToWorld = glm.HomogRotate3D(angle, axis)
}

//QuatRotate add the rotation represented by this (angle,quat) to the current transform.
func (t *Transform) QuatRotate(angle float32, axis glm.Vec3) {
	t.LocalToWorld = t.LocalToWorld.Mul4(glm.HomogRotate3D(angle, axis))
}

func (cylinder *Cylinder) Rotate(angle float32, axis mgl32.Vec3) {
	cylinder.Model = cylinder.Model.Mul4(mgl32.HomogRotate3D(angle, axis))
}

func (sphere *Sphere) Rotate(angle float32, axis mgl32.Vec3) {
	sphere.Model = sphere.Model.Mul4(mgl32.HomogRotate3D(angle, axis))
}

func (objectLoader *WavefrontObject) Rotate(angle float32, axis mgl32.Vec3) {
	for index, _ := range objectLoader.Objects {
		objectLoader.Objects[index].Model = objectLoader.Objects[index].Model.Mul4(mgl32.HomogRotate3D(angle, axis))
	}
}

func (terrain *Terrain) Rotate(angle float32, axis mgl32.Vec3) {
	terrain.Model = terrain.Model.Mul4(mgl32.HomogRotate3D(angle, axis))
}

func main() {
	if err := glfw.Init(); err != nil {
		log.Fatalln("failed to initialize glfw:", err)
	}
	defer glfw.Terminate()

	glfw.WindowHint(glfw.Resizable, glfw.False)
	glfw.WindowHint(glfw.ContextVersionMajor, 4)
	glfw.WindowHint(glfw.ContextVersionMinor, 1)
	glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
	glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
	window, err := glfw.CreateWindow(windowWidth, windowHeight, "Cube", nil, nil)

	if err != nil {
		panic(err)
	}
	window.MakeContextCurrent()

	// Initialize Glow
	if err := gl.Init(); err != nil {
		panic(err)
	}

	version := gl.GoStr(gl.GetString(gl.VERSION))
	fmt.Println("OpenGL version", version)

	// Configure the vertex and fragment shaders
	program, err := newProgram(vertexShader, fragmentShader)

	if err != nil {
		panic(err)
	}

	gl.UseProgram(program)

	projection := mgl32.Perspective(mgl32.DegToRad(45.0), float32(windowWidth)/windowHeight, 0.1, 10.0)
	projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
	gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])

	camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
	cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
	gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])

	model := mgl32.Ident4()
	modelUniform := gl.GetUniformLocation(program, gl.Str("model\x00"))
	gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])

	textureUniform := gl.GetUniformLocation(program, gl.Str("tex\x00"))
	gl.Uniform1i(textureUniform, 0)

	gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))

	// Load the texture
	texture, err := newTexture("square.png")
	if err != nil {
		panic(err)
	}

	// Configure the vertex data
	var vao uint32
	gl.GenVertexArrays(1, &vao)
	gl.BindVertexArray(vao)

	var vbo uint32
	gl.GenBuffers(1, &vbo)
	gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
	gl.BufferData(gl.ARRAY_BUFFER, len(cubeVertices)*4, gl.Ptr(cubeVertices), gl.STATIC_DRAW)

	vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
	gl.EnableVertexAttribArray(vertAttrib)
	gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))

	texCoordAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vertTexCoord\x00")))
	gl.EnableVertexAttribArray(texCoordAttrib)
	gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))

	// Configure global settings
	gl.Enable(gl.DEPTH_TEST)
	gl.DepthFunc(gl.LESS)
	gl.ClearColor(1.0, 1.0, 1.0, 1.0)

	angle := 0.0
	previousTime := glfw.GetTime()

	for !window.ShouldClose() {
		gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

		// Update
		time := glfw.GetTime()
		elapsed := time - previousTime
		previousTime = time

		angle += elapsed
		model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})

		// Render
		gl.UseProgram(program)
		gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])

		gl.BindVertexArray(vao)
//.........这里部分代码省略.........

//.........这里部分代码省略.........
	}

	// Note that it is possible to use GL functions spanning multiple versions
	if err := gl4.Init(); err != nil {
		fmt.Printf("Could not initialize GL 4.4 (non-fatal)")
	}

	if gl.ARB_debug_output {
		gl.Enable(gl.DEBUG_OUTPUT_SYNCHRONOUS_ARB)
		gl.DebugMessageCallbackARB(gl.DebugProc(glDebugCallback), gl.Ptr(nil))
		// Trigger an error to demonstrate debug output
		gl.Enable(gl.CONTEXT_FLAGS)
	}

	version := gl.GoStr(gl.GetString(gl.VERSION))
	fmt.Println("OpenGL version", version)

	// Configure the vertex and fragment shaders
	program, err := newProgram(vertexShader, fragmentShader)
	if err != nil {
		panic(err)
	}
	gl.UseProgram(program)

	projection := mgl32.Perspective(70.0, float32(WindowWidth)/WindowHeight, 0.1, 10.0)
	projectionUniform := gl.GetUniformLocation(program, gl.Str("projection\x00"))
	gl.UniformMatrix4fv(projectionUniform, 1, false, &projection[0])

	camera := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
	cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
	gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])

	model := mgl32.Ident4()
	modelUniform := gl.GetUniformLocation(program, gl.Str("model\x00"))
	gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])

	textureUniform := gl.GetUniformLocation(program, gl.Str("tex\x00"))
	gl.Uniform1i(textureUniform, 0)

	gl.BindFragDataLocation(program, 0, gl.Str("outputColor\x00"))

	// Load the texture
	texture, err := newTexture("square.png")
	if err != nil {
		panic(err)
	}

	// Configure the vertex data
	var vao uint32
	gl.GenVertexArrays(1, &vao)
	gl.BindVertexArray(vao)

	var vbo uint32
	gl.GenBuffers(1, &vbo)
	gl.BindBuffer(gl.ARRAY_BUFFER, vbo)
	gl.BufferData(gl.ARRAY_BUFFER, len(cubeVertices)*4, gl.Ptr(cubeVertices), gl.STATIC_DRAW)

	vertAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vert\x00")))
	gl.EnableVertexAttribArray(vertAttrib)
	gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, 5*4, gl.PtrOffset(0))

	texCoordAttrib := uint32(gl.GetAttribLocation(program, gl.Str("vertTexCoord\x00")))
	gl.EnableVertexAttribArray(texCoordAttrib)
	gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, false, 5*4, gl.PtrOffset(3*4))

	// Configure global settings
	gl.Enable(gl.DEPTH_TEST)
	gl.DepthFunc(gl.LESS)
	gl.ClearColor(1.0, 1.0, 1.0, 1.0)

	angle := 0.0
	previousTime := glfw.GetTime()

	for !window.ShouldClose() {
		gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

		// Update
		time := glfw.GetTime()
		elapsed := time - previousTime
		previousTime = time

		angle += elapsed
		model = mgl32.HomogRotate3D(float32(angle), mgl32.Vec3{0, 1, 0})

		// Render
		gl.UseProgram(program)
		gl.UniformMatrix4fv(modelUniform, 1, false, &model[0])

		gl.BindVertexArray(vao)

		gl.ActiveTexture(gl.TEXTURE0)
		gl.BindTexture(gl.TEXTURE_2D, texture)

		gl.DrawArrays(gl.TRIANGLES, 0, 6*2*3)

		// Maintenance
		window.SwapBuffers()
		glfw.PollEvents()
	}
}