Golang gl.Translated函数代码示例

// OpenGL draw function & timing
func draw() {
	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	gl.PushMatrix()
	gl.Rotated(view_rotx, 1.0, 0.0, 0.0)
	gl.Rotated(view_roty, 0.0, 1.0, 0.0)
	gl.Rotated(view_rotz, 0.0, 0.0, 1.0)

	gl.PushMatrix()
	gl.Translated(-3.0, -2.0, 0.0)
	gl.Rotated(angle, 0.0, 0.0, 1.0)
	gl.CallList(gear1)
	gl.PopMatrix()

	gl.PushMatrix()
	gl.Translated(3.1, -2.0, 0.0)
	gl.Rotated(-2.0*angle-9.0, 0.0, 0.0, 1.0)
	gl.CallList(gear2)
	gl.PopMatrix()

	gl.PushMatrix()
	gl.Translated(-3.1, 4.2, 0.0)
	gl.Rotated(-2.0*angle-25.0, 0.0, 0.0, 1.0)
	gl.CallList(gear3)
	gl.PopMatrix()

	gl.PopMatrix()
}

func (p *Planetoid) Render(dp float64) {
	glh.With(glh.Matrix{gl.MODELVIEW}, func() {

		gl.Rotated(p.rising_node, 0, 1, 0)
		gl.Rotated(p.inclination, 0, 0, 1)

		gl.Rotated(p.phase0+p.phase, 0, 1, 0)
		p.phase += dp*10 + (1 - p.apogee)

		glh.With(glh.Matrix{gl.MODELVIEW}, func() {
			// TODO: Compute position correctly
			gl.Translated(p.apogee, 0, 0)
			Sphere(p.radius, 3)
		})

		// TODO: Avoid depth thrashing when trails overlap
		// Trail
		glh.With(glh.Matrix{gl.MODELVIEW}, func() {
			gl.Rotated(90, 1, 0, 0)
			gl.Scaled(p.apogee, p.apogee, 1)

			gl.LineWidth(2)
			glh.With(glh.Disable(gl.LIGHTING), func() {
				p.circle.Render(gl.LINE_STRIP)
			})
		})
	})
}

func runGameLoop(window *glfw.Window) {
	for !window.ShouldClose() {
		// update objects
		updateObjects()

		// hit detection
		hitDetection()

		// ---------------------------------------------------------------
		// draw calls
		gl.Clear(gl.COLOR_BUFFER_BIT)

		drawCurrentScore()
		drawHighScore()

		if isGameWon() {
			drawWinningScreen()
		} else if isGameLost() {
			drawGameOverScreen()
		}

		// draw everything 9 times in a 3x3 grid stitched together for seamless clipping
		for x := -1.0; x < 2.0; x++ {
			for y := -1.0; y < 2.0; y++ {
				gl.MatrixMode(gl.MODELVIEW)
				gl.PushMatrix()
				gl.Translated(gameWidth*x, gameHeight*y, 0)

				drawObjects()

				gl.PopMatrix()
			}
		}

		gl.Flush()
		window.SwapBuffers()
		glfw.PollEvents()

		// switch resolution
		if altEnter {
			window.Destroy()

			fullscreen = !fullscreen
			var err error
			window, err = initWindow()
			if err != nil {
				panic(err)
			}

			altEnter = false

			gl.LineWidth(1)
			if fullscreen {
				gl.LineWidth(2)
			}
		}
	}
}

func PlaceObject(compiledPrim gl.List, scale [3]double, translation [3]double, rotation [4]double) {
	// objects are placed and transformed when necessary
	gl.PushMatrix()
	gl.Scaled(scale)
	gl.Translated(translation)
	gl.Rotated(rotation)
	gl.CallList(compiledPrim)
	gl.PopMatrix()
}

// new window size
func reshape(window *glfw.Window, width, height int) {

	gl.Viewport(0, 0, width, height)
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	gl.Frustum(-1.0, 1.0, -1.0, 1.0, 1, 20)
	gl.MatrixMode(gl.MODELVIEW)
	gl.LoadIdentity()
	gl.Translated(0.0, 0.0, -20.0)
}

func draw() {

	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	gl.PushMatrix()
	gl.Rotated(view_rotx, 1.0, 0.0, 0.0)
	gl.Rotated(view_roty, 0.0, 1.0, 0.0)
	gl.Rotated(view_rotz, 0.0, 0.0, 1.0)

	gl.PushMatrix()
	gl.Translated(-3.0, -2.0, 0.0)
	gl.Rotated(angle, 0.0, 0.0, 1.0)
	gl.CallList(gear1)
	gl.PopMatrix()

	gl.PushMatrix()
	gl.Translated(3.1, -2.0, 0.0)
	gl.Rotated(-2.0*angle-9.0, 0.0, 0.0, 1.0)
	gl.CallList(gear2)
	gl.PopMatrix()

	gl.PushMatrix()
	gl.Translated(-3.1, 4.2, 0.0)
	gl.Rotated(-2.0*angle-25.0, 0.0, 0.0, 1.0)
	gl.CallList(gear3)
	gl.PopMatrix()

	gl.PopMatrix()

	sdl.GL_SwapBuffers()

	Frames++
	{
		t := sdl.GetTicks()
		if t-T0 >= 5000 {
			seconds := (t - T0) / 1000.0
			fps := Frames / seconds
			print(Frames, " frames in ", seconds, " seconds = ", fps, " FPS\n")
			T0 = t
			Frames = 0
		}
	}
}

func DrawEntity(en Entity) {

	x := en.Xpos
	y := en.Ypos
	r := en.Rot
	s := en.Size
	col := en.Colour

	switch col {
	case "grey":
		gl.Color3d(0.5, 0.5, 0.5)
	case "red":
		gl.Color3d(1, 0, 0)
	case "green":
		gl.Color3d(0, 1, 0)
	case "blue":
		gl.Color3d(0, 0, 1)
	case "lblue":
		gl.Color3d(0.3, 0.3, 1)
	case "orange":
		gl.Color3d(1, 0.5, 0)
	case "yellow":
		gl.Color3d(1, 1, 0)
	case "purple":
		gl.Color3d(1, 0, 1)
	case "white":
		gl.Color3d(1, 1, 1)
	default:
		gl.Color3d(1, 1, 1)
	}

	gl.PushMatrix()

	gl.Translated(x, y, 0)
	gl.Scaled(s, s, s)
	//gl.Rotated(r*180/math.Pi, 0, 0, 1)
	gl.Rotated(r, 0, 0, 1)

	enx := [3]float64{-0.7, 0.7, 0}
	eny := [3]float64{1, 1, -1}

	//in OpenGL 3.2, the vertices below would be stored on the GPU
	//so all you would need to do is say DrawShape(A) or something

	gl.Begin(gl.TRIANGLES)
	gl.Vertex3d(enx[0], eny[0], 0)
	gl.Vertex3d(enx[1], eny[1], 0)
	gl.Vertex3d(enx[2], eny[2], 0)
	gl.End()

	gl.PopMatrix()

}

// new window size
func reshape(window *glfw.Window, width, height int) {
	h := float64(height) / float64(width)

	znear := 5.0
	zfar := 30.0
	xmax := znear * 0.5

	gl.Viewport(0, 0, width, height)
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	gl.Frustum(-xmax, xmax, -xmax*h, xmax*h, znear, zfar)
	gl.MatrixMode(gl.MODELVIEW)
	gl.LoadIdentity()
	gl.Translated(0.0, 0.0, -20.0)
}

// Draw a test pattern
func TestWindowCoordsA(t *testing.T) {
	gltest.OnTheMainThread(func() {
		gltest.SetWindowSize(40, 5)

		w, h := GetViewportWH()
		With(WindowCoords{}, func() {
			// So that we draw in the middle of the pixel
			gl.Translated(0.5, 0.5, 0)

			gl.Color4f(1, 1, 1, 1)
			With(Primitive{gl.POINTS}, func() {
				for i := 0; i < w+1; i += 2 {
					gl.Vertex2i(i, h/2)
				}
			})
		})
	}, func() {
		CaptureToPng("TestWindowCoordsA.png")
	})
}

func renderDashboard() {
	gl.LoadIdentity()
	setColor(Blue)
	fonts[32].Printf(float32(XMin), float32(WindowHeight-DashboardHeight),
		"Level %d", g.currentLevel)
	gl.Translatef(float32(XMin)+300, float32(WindowHeight-DashboardHeight), 0)
	line := 0
	for _, c := range g.level.winSignature {
		if c == '\n' {
			line++
			gl.LoadIdentity()
			gl.Translatef(float32(XMin)+300, float32(WindowHeight-DashboardHeight+SignatureBlockSize*line+BlockPadding), 0)
			continue
		}
		if c != '-' {
			renderBlockSignature(atoc(string(c)))
		}
		gl.Translated(SignatureBlockSize+BlockPadding, 0, 0)
	}
}

func (p *Planetoid) RenderShadowVolume() {
	glh.With(glh.Matrix{gl.MODELVIEW}, func() {

		// gl.Rotated(90, 0, 1, 0)

		gl.Rotated(p.rising_node, 0, 1, 0)
		gl.Rotated(p.inclination, 0, 0, 1)

		gl.Rotated(p.phase0+p.phase, 0, 1, 0)

		// TODO: Compute position correctly
		gl.Translated(p.apogee, 0, 0)

		gl.Rotated(p.phase0+p.phase, 0, -1, 0)
		gl.Rotated(p.inclination, 0, 0, -1)
		gl.Rotated(p.rising_node, 0, -1, 0)

		// gl.Rotated(p.phase0+p.phase, 0, -1, 0)

		gl.Rotated(90, 0, -1, 0)
		glu.Cylinder(quadric, p.radius, p.radius, 2, 10, 1)
	})
}

func (block *Block) Draw(start, N int64, detailed bool) {
	if block.tex == nil {
		block.RequestTexture()
	}

	switch detailed {
	case true:
		block.detail_needed = true
		if block.vertex_data == nil {
			// Hey, we need vertices but don't have them! Let's fix that..
			block.RequestVertices()
		}
	default:
		block.detail_needed = false
	}

	width := uint64(len(block.display_active_pages)) * *PAGE_SIZE
	if width == 0 {
		width = 1
	}

	vc := glh.NewMeshBuffer(glh.RenderArrays,
		glh.NewPositionAttr(2, gl.FLOAT, gl.STATIC_DRAW),
		glh.NewPositionAttr(4, gl.UNSIGNED_INT, gl.STATIC_DRAW),
	)

	colors := make([]int32, 0)
	positions := make([]float32, 0)

	// var vc glh.ColorVertices

	if *pageboundaries {
		// boundary_color := color.RGBA{64, 64, 64, 255}

		// If we try and draw too many of these, X will hang
		if width / *PAGE_SIZE < 10000 {
			for p := uint64(0); p <= width; p += *PAGE_SIZE {
				x := float32(p) / float32(width)
				x = (x - 0.5) * 4

				colors = append(colors, 64, 64, 64, 255)
				positions = append(positions, x, float32(N))

				// vc.Add(glh.ColorVertex{boundary_color, glh.Vertex{x, 0}})
				// vc.Add(glh.ColorVertex{boundary_color, glh.Vertex{x, float32(N)}})
			}
		}
	}

	var border_color [4]float64

	gl.LineWidth(1)
	glh.With(&Timer{Name: "DrawPartial"}, func() {
		var x1, y1, x2, y2 float64
		glh.With(glh.Matrix{gl.MODELVIEW}, func() {
			// TODO: A little less co-ordinate insanity?
			gl.Translated(0, -2, 0)
			gl.Scaled(1, 4/float64(*nback), 1)
			gl.Translated(0, -float64(start), 0)

			x1, y1 = glh.ProjToWindow(-2, 0)
			x2, y2 = glh.ProjToWindow(-2+WIDTH, float64(N))

		})
		border_color = [4]float64{1, 1, 1, 1}

		glh.With(glh.Matrix{gl.MODELVIEW}, func() {
			gl.Translated(0, -2, 0)
			gl.Scaled(1, 4/float64(*nback), 1)
			gl.Translated(0, -float64(start), 0)

			// Page boundaries
			// TODO: Use different blending scheme on textured quads so that the
			//       lines show through
			glh.With(glh.Attrib{gl.ENABLE_BIT}, func() {
				gl.Disable(gl.LINE_SMOOTH)
				// vc.Draw(gl.LINES)
				vc.Render(gl.LINES)
			})
		})

		if block.tex != nil && (!detailed || block.vertex_data == nil) {
			border_color = [4]float64{0, 0, 1, 1}
			glh.With(glh.WindowCoords{Invert: true}, func() {
				gl.Color4f(1, 1, 1, 1)
				// Render textured block quad
				glh.With(block.tex, func() {
					glh.DrawQuadd(x1, y1, x2-x1, y2-y1)
				})
				glh.With(glh.Primitive{gl.LINES}, func() {
					glh.Squared(x1, y1, x2-x1, y2-y1)
				})
			})
			if block.vertex_data != nil && !block.detail_needed {
				// TODO: figure out when we can unload
				// Hey, we can unload you, because you are not needed
				block.vertex_data = nil
			}

		}
//.........这里部分代码省略.........

func (block *Block) BuildTexture() {
	block.tex = glh.NewTexture(1024, 256)
	block.tex.Init()

	// TODO: use runtime.SetFinalizer() to clean up/delete the texture?
	glh.With(block.tex, func() {
		//gl.TexParameteri(gl.TEXTURE_2D, gl.GENERATE_MIPMAP, gl.TRUE)

		//gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR_MIPMAP_LINEAR)

		gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.NEAREST_MIPMAP_NEAREST)
		gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.NEAREST)
		// TODO: Only try and activate anisotropic filtering if it is available

		gl.TexParameterf(gl.TEXTURE_2D, GL_TEXTURE_MAX_ANISOTROPY_EXT, MaxAnisotropy)
		gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAX_LEVEL, 1)
	})

	for i := 0; i < 2; i++ {
		glh.With(&glh.Framebuffer{Texture: block.tex, Level: i}, func() {
			glh.With(glh.Attrib{gl.COLOR_BUFFER_BIT}, func() {
				gl.ClearColor(1, 0, 0, 0)
				gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
			})
			viewport_proj := glh.Compound(glh.Attrib{gl.VIEWPORT_BIT},
				glh.Matrix{gl.PROJECTION})

			glh.With(viewport_proj, func() {
				gl.Viewport(0, 0, block.tex.W/(1<<uint(i)), block.tex.H/(1<<uint(i)))
				gl.LoadIdentity()
				//gl.Ortho(0, float64(tex.w), 0, float64(tex.h), -1, 1)
				gl.Ortho(-2, -2+WIDTH, 2, -2, -1, 1)

				glh.With(glh.Matrix{gl.MODELVIEW}, func() {
					gl.LoadIdentity()

					//gl.Hint(gl.LINES, gl.NICEST)
					//gl.LineWidth(4)
					/*
						glh.With(glh.Primitive{gl.LINES}, func() {
							gl.Color4f(1, 1, 1, 1)
							gl.Vertex2f(-2, 0)
							gl.Vertex2f(2, 0)
						})
					*/

					gl.PointSize(4)
					glh.With(glh.Matrix{gl.MODELVIEW}, func() {
						gl.Translated(0, -2, 0)
						gl.Scaled(1, 4/float64(block.nrecords), 1)

						block.vertex_data.Render(gl.POINTS)
					})

					/*
						gl.Color4f(0.5, 0.5, 1, 1)
						With(Primitive{gl.LINE_LOOP}, func() {
							b := 0.2
							Squared(-2.1+b, -2.1+b, 4.35-b*2, 4.2-b*2)
						})
					*/
				})
			})
		})
	}

	//block.img = block.tex.AsImage()
	if !block.detail_needed {
		block.vertex_data = nil
		runtime.GC()
	}

	blocks_rendered++
}

func main() {

	sdl.Init(sdl.INIT_VIDEO)

	var screen = sdl.SetVideoMode(640, 480, 32, sdl.OPENGL)

	if screen == nil {
		panic("sdl error")
	}

	if gl.Init() != 0 {
		panic("gl error")
	}

	gl.MatrixMode(gl.PROJECTION)

	gl.Viewport(0, 0, int(screen.W), int(screen.H))
	gl.LoadIdentity()
	gl.Ortho(-5, 5, -2.5, 2.5, -1.0, 1.0)

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

	gl.PolygonMode(gl.FRONT_AND_BACK, gl.LINE)

	tess := glu.NewTess()

	tess.SetBeginCallback(tessBeginHandler)
	tess.SetVertexCallback(tessVertexHandler)
	tess.SetEndCallback(tessEndHandler)
	tess.SetErrorCallback(tessErrorHandler)
	tess.SetEdgeFlagCallback(tessEdgeFlagHandler)
	tess.SetCombineCallback(tessCombineHandler)

	tess.Normal(0, 0, 1)

	var running = true

	for running {

		gl.MatrixMode(gl.MODELVIEW)
		gl.LoadIdentity()
		gl.Translated(-2.5, 0, 0)

		tess.BeginPolygon(nil)
		tess.BeginContour()

		for v := range OuterContour {
			tess.Vertex(OuterContour[v], &OuterContour[v])
		}

		tess.EndContour()
		tess.BeginContour()

		for v := range InnerContour {
			tess.Vertex(InnerContour[v], &InnerContour[v])
		}

		tess.EndContour()
		tess.EndPolygon()

		gl.Translated(5, 0, 0)

		tess.BeginPolygon(nil)
		tess.BeginContour()

		for v := range StarContour {
			tess.Vertex(StarContour[v], &StarContour[v])
		}

		tess.EndContour()
		tess.EndPolygon()

		sdl.GL_SwapBuffers()
		sdl.Delay(25)
	}

	tess.Delete()
	sdl.Quit()

}

//.........这里部分代码省略.........
		glh.With(glh.Attrib{
			gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.ENABLE_BIT |
				gl.POLYGON_BIT | gl.STENCIL_BUFFER_BIT,
		}, func() {

			gl.Disable(gl.LIGHTING)

			if shadowing {
				// gl.Disable(gl.DEPTH_TEST)
				gl.DepthMask(false)
				gl.DepthFunc(gl.LEQUAL)

				gl.Enable(gl.STENCIL_TEST)
				gl.ColorMask(false, false, false, false)
				gl.StencilFunc(gl.ALWAYS, 1, 0xffffffff)
			}

			shadow_volume := func() {
				const sv_length = 2
				const sv_granularity = 100
				const sv_radius = earth_radius * 1.001

				// Shadow cone
				glh.With(glh.Matrix{gl.MODELVIEW}, func() {
					gl.Rotatef(90, 1, 0, 0)
					gl.Rotatef(90, 0, -1, 0)
					gl.Color4f(0.5, 0.5, 0.5, 1)
					glu.Cylinder(quadric, sv_radius, sv_radius*1.05,
						sv_length, sv_granularity, 1)

					glu.Disk(quadric, 0, sv_radius, sv_granularity, 1)

					glh.With(glh.Matrix{gl.MODELVIEW}, func() {
						gl.Translated(0, 0, sv_length)
						glu.Disk(quadric, 0, sv_radius*1.05, sv_granularity, 1)
					})
				})

				for _, p := range planetoids {
					p.RenderShadowVolume()
				}

			}

			if cone {
				gl.FrontFace(gl.CCW)
				gl.StencilOp(gl.KEEP, gl.KEEP, gl.INCR)

				shadow_volume()

				gl.FrontFace(gl.CW)
				gl.StencilOp(gl.KEEP, gl.KEEP, gl.DECR)

				shadow_volume()
			}

			if shadowing {
				gl.StencilFunc(gl.NOTEQUAL, 0, 0xffffffff)
				gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)

				gl.ColorMask(true, true, true, true)
				// gl.Disable(gl.STENCIL_TEST)

				gl.Disable(gl.DEPTH_TEST)

				gl.FrontFace(gl.CCW)