// reset our viewport after a window resize
func resizeWindow(width, height int) {
	// protect against a divide by zero
	if height == 0 {
		height = 1
	}

	// Setup our viewport
	gl.Viewport(0, 0, width, height)

	// change to the projection matrix and set our viewing volume.
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()

	// aspect ratio
	aspect := gl.GLdouble(width / height)

	// Set our perspective.
	// This code is equivalent to using gluPerspective as in the original tutorial.
	var fov, near, far gl.GLdouble
	fov = 45.0
	near = 0.1
	far = 100.0
	top := gl.GLdouble(math.Tan(float64(fov*math.Pi/360.0))) * near
	bottom := -top
	left := aspect * bottom
	right := aspect * top
	gl.Frustum(float64(left), float64(right), float64(bottom), float64(top), float64(near), float64(far))

	// Make sure we're changing the model view and not the projection
	gl.MatrixMode(gl.MODELVIEW)

	// Reset the view
	gl.LoadIdentity()
}
Example #2
0
func main() {
	var err os.Error
	if err = glfw.Init(); err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		return
	}

	defer glfw.Terminate()

	// Open window with FSAA samples (if possible).
	glfw.OpenWindowHint(glfw.FsaaSamples, 4)

	if err = glfw.OpenWindow(400, 400, 0, 0, 0, 0, 0, 0, glfw.Windowed); err != nil {
		fmt.Fprintf(os.Stderr, "%v\n", err)
		return
	}

	defer glfw.CloseWindow()

	glfw.SetWindowTitle("Aliasing Detector")
	glfw.SetSwapInterval(1)

	if samples := glfw.WindowParam(glfw.FsaaSamples); samples != 0 {
		fmt.Fprintf(os.Stdout, "Context reports FSAA is supported with %d samples\n", samples)
	} else {
		fmt.Fprintf(os.Stdout, "Context reports FSAA is unsupported\n")
	}

	gl.MatrixMode(gl.PROJECTION)
	glu.Perspective(0, 1, 0, 1)

	for glfw.WindowParam(glfw.Opened) == 1 {
		time := float32(glfw.Time())

		gl.Clear(gl.COLOR_BUFFER_BIT)

		gl.LoadIdentity()
		gl.Translatef(0.5, 0, 0)
		gl.Rotatef(time, 0, 0, 1)

		gl.Enable(GL_MULTISAMPLE_ARB)
		gl.Color3f(1, 1, 1)
		gl.Rectf(-0.25, -0.25, 0.25, 0.25)

		gl.LoadIdentity()
		gl.Translatef(-0.5, 0, 0)
		gl.Rotatef(time, 0, 0, 1)

		gl.Disable(GL_MULTISAMPLE_ARB)
		gl.Color3f(1, 1, 1)
		gl.Rectf(-0.25, -0.25, 0.25, 0.25)
		glfw.SwapBuffers()
	}
}
Example #3
0
/* new window size or exposure */
func reshape(width int, height int) {

	h := float64(height) / float64(width)

	gl.Viewport(0, 0, width, height)
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	gl.Frustum(-1.0, 1.0, -h, h, 5.0, 60.0)
	gl.MatrixMode(gl.MODELVIEW)
	gl.LoadIdentity()
	gl.Translatef(0.0, 0.0, -40.0)
}
Example #4
0
func reshape(w, h int) {
	if h == 0 {
		h = 1
	}
	gl.Viewport(0, 0, w, h)
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	glu.Perspective(45.0, float64(w)/float64(h), 0.1, 100.0)
	gl.MatrixMode(gl.MODELVIEW)
	gl.LoadIdentity()
	resetZoom()
}
Example #5
0
func resetZoom() {
	// Reset viewport
	gl.LoadIdentity()
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()

	// Reset ortho view
	gl.Ortho(left, right, bottom, top, 1, -1)
	gl.Rotatef(180, 0, 0, 0)
	gl.Translatef(float32(-*cx), float32(-*cy), 0)
	gl.MatrixMode(gl.MODELVIEW)
	gl.Disable(gl.DEPTH_TEST)
	gl.LoadIdentity()
}
Example #6
0
func glEnable2D() {

	var vPort [4]gl.GLint

	gl.GetIntegerv(gl.VIEWPORT, &vPort[0])

	gl.MatrixMode(gl.PROJECTION)
	gl.PushMatrix()
	gl.LoadIdentity()

	gl.Ortho(0.0, gl.GLdouble(vPort[2]), 0.0, gl.GLdouble(vPort[3]), -1.0, 1.0)
	gl.MatrixMode(gl.MODELVIEW)
	gl.PushMatrix()
	gl.LoadIdentity()
}
// Here goes our drawing code
func drawGLScene() {
	// Clear the screen and depth buffer
	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	// Move left 1.5 units and into the screen 6.0 units.
	gl.LoadIdentity()
	gl.Translatef(-1.5, 0.0, -6.0)
	gl.Rotatef(float32(rtri), 0.0, 1.0, 0.0) // Rotate the triangle on the Y axis

	gl.Begin(gl.TRIANGLES)       // Draw triangles
	gl.Color3f(1.0, 0.0, 0.0)    // Set The Color To Red
	gl.Vertex3f(0.0, 1.0, 0.0)   // top
	gl.Color3f(0.0, 1.0, 0.0)    // Set The Color To Red
	gl.Vertex3f(-1.0, -1.0, 0.0) // bottom left
	gl.Color3f(0.0, 0.0, 1.0)    // Set The Color To Red
	gl.Vertex3f(1.0, -1.0, 0.0)  // bottom right
	gl.End()                     // finish drawing the triangle

	// Move right 3 units
	gl.LoadIdentity()
	gl.Translatef(1.5, 0.0, -6.0)
	gl.Color3f(0.5, 0.5, 1.0)                 // Set The Color To Blue One Time Only
	gl.Rotatef(float32(rquad), 1.0, 0.0, 0.0) // rotate the quad on the X axis

	gl.Begin(gl.QUADS)           // draw quads
	gl.Vertex3f(-1.0, 1.0, 0.0)  // top left
	gl.Vertex3f(1.0, 1.0, 0.0)   // top right
	gl.Vertex3f(1.0, -1.0, 0.0)  // bottom right
	gl.Vertex3f(-1.0, -1.0, 0.0) // bottom left
	gl.End()                     // done drawing the quad

	// Draw to the screen
	sdl.GL_SwapBuffers()

	rtri += 0.2   // Increase The Rotation Variable For The Triangle
	rquad -= 0.15 // Decrease The Rotation Variable For The Quad

	// Gather our frames per second
	frames++
	t := sdl.GetTicks()
	if t-t0 >= 5000 {
		seconds := (t - t0) / 1000.0
		fps := frames / seconds
		fmt.Println(frames, "frames in", seconds, "seconds =", fps, "FPS")
		t0 = t
		frames = 0
	}
}
Example #8
0
func (f *Font) DrawText2D(x int, y int, color [3]byte, scale float, txt string) (endw int, endh int) {
	gl.LoadIdentity()
	//	gl.Translatef(0.0, 0.0, -2.0);

	glEnable2D()
	gl.Disable(gl.DEPTH_TEST)

	texture, initial, intermediarya, intermediary, w, h := f.setupTextRendering(color, txt)

	locX := gl.GLfloat(x)
	locY := gl.GLfloat(y)
	wi := gl.GLfloat(w) * gl.GLfloat(scale)
	he := gl.GLfloat(h) * gl.GLfloat(scale)

	/* Draw a quad at location */
	gl.Begin(gl.QUADS)
	/* Recall that the origin is in the lower-left corner
	   That is why the TexCoords specify different corners
	   than the Vertex coors seem to. */
	gl.TexCoord2f(0.0, 1.0)
	gl.Vertex2f(locX, locY)
	gl.TexCoord2f(1.0, 1.0)
	gl.Vertex2f(locX+wi, locY)
	gl.TexCoord2f(1.0, 0.0)
	gl.Vertex2f(locX+wi, locY+he)
	gl.TexCoord2f(0.0, 0.0)
	gl.Vertex2f(locX, locY+he)
	gl.End()

	endw, endh = f.teardownTextRendering(texture, initial, intermediarya, intermediary)

	gl.Enable(gl.DEPTH_TEST)
	glDisable2D()
	return
}
Example #9
0
func drawFrame() {

	gl.LoadIdentity()
	gl.LineWidth(5.0)
	gl.Enable(gl.POINT_SMOOTH)
	gl.Enable(gl.LINE_SMOOTH)

	gl.Color4f(gl.GLfloat(FrameColor[0]), gl.GLfloat(FrameColor[1]), gl.GLfloat(FrameColor[2]), 0.1)

	m := PlayArea

	t := 1.0 * m
	b := -1.0 * m
	r := 1.0 * m
	l := -1.0 * m

	gl.Begin(gl.LINE_STRIP)

	zo := -5.0

	gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(t), gl.GLfloat(zo))
	gl.Vertex3f(gl.GLfloat(r), gl.GLfloat(t), gl.GLfloat(zo))
	gl.Vertex3f(gl.GLfloat(r), gl.GLfloat(b), gl.GLfloat(zo))
	gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(b), gl.GLfloat(zo))
	gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(t), gl.GLfloat(zo))

	gl.End()

}
Example #10
0
func display() {
	gl.Clear(gl.COLOR_BUFFER_BIT)
	bitmap_output(40, 35, "This is written in a GLUT bitmap font.", glut.BITMAP_TIMES_ROMAN_24)
	bitmap_output(30, 210, "More bitmap text is a fixed 9 by 15 font.", glut.BITMAP_9_BY_15)
	bitmap_output(70, 240, "                Helvetica is yet another bitmap font.", glut.BITMAP_HELVETICA_18)

	gl.MatrixMode(gl.PROJECTION)
	gl.PushMatrix()
	gl.LoadIdentity()
	glu.Perspective(40.0, 1.0, 0.1, 20.0)
	gl.MatrixMode(gl.MODELVIEW)
	gl.PushMatrix()
	// Banthar's glu doesn't have this right now.
	// glu.LookAt(0.0, 0.0, 4.0, /* eye is at (0,0,30) */
	// 	0.0, 0.0, 0.0, /* center is at (0,0,0) */
	// 	0.0, 1.0, 0.) /* up is in postivie Y direction */
	gl.PushMatrix()
	gl.Translatef(0, 0, -4)
	gl.Rotatef(50, 0, 1, 0)
	stroke_output(-2.5, 1.1, "  This is written in a", glut.STROKE_ROMAN)
	stroke_output(-2.5, 0, " GLUT stroke font.", glut.STROKE_ROMAN)
	stroke_output(-2.5, -1.1, "using 3D perspective.", glut.STROKE_ROMAN)
	gl.PopMatrix()
	gl.MatrixMode(gl.MODELVIEW)
	gl.PopMatrix()
	gl.MatrixMode(gl.PROJECTION)
	gl.PopMatrix()
	gl.MatrixMode(gl.MODELVIEW)
	gl.Flush()
}
Example #11
0
func reshape(w, h int) {
	gl.Viewport(0, 0, w, h)
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	gl.Ortho(0, float64(w), 0, float64(h), -1, 1)
	gl.Scalef(1, -1, 1)
	gl.Translatef(0, float32(-h), 0)
	gl.MatrixMode(gl.MODELVIEW)
}
Example #12
0
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("glew error")
	}

	pen := Pen{}

	gl.MatrixMode(gl.PROJECTION)

	gl.Viewport(0, 0, gl.GLsizei(screen.W), gl.GLsizei(screen.H))
	gl.LoadIdentity()
	gl.Ortho(0, gl.GLdouble(screen.W), gl.GLdouble(screen.H), 0, -1.0, 1.0)

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

	var running = true

	for running {

		e := &sdl.Event{}

		for e.Poll() {
			switch e.Type {
			case sdl.QUIT:
				running = false
				break
			case sdl.KEYDOWN:
				running = false
				break
			case sdl.MOUSEMOTION:
				me := e.MouseMotion()
				if me.State != 0 {
					pen.lineTo(Point{int(me.X), int(me.Y)})
				} else {
					pen.moveTo(Point{int(me.X), int(me.Y)})
				}
				break
			}
		}

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

	sdl.Quit()

}
Example #13
0
func reshape(w, h int) {
	gl.Viewport(0, 0, gl.GLsizei(w), gl.GLsizei(h))
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	gl.Ortho(0, gl.GLdouble(w), 0, gl.GLdouble(h), -1, 1)
	gl.Scalef(1, -1, 1)
	gl.Translatef(0, gl.GLfloat(-h), 0)
	gl.MatrixMode(gl.MODELVIEW)
}
Example #14
0
func (self *Camera) Setup() {
	d := self.Distance
	Angle := self.Angle
	Angle360 := Angle.Scale(1 / math.Pi * 180)
	TargetPos := self.Target.Pos

	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	gl.Viewport(0, 0, 800, 600)
	gl.Frustum(-1, 1, -1, 1, 4, 1000)

	gl.MatrixMode(gl.MODELVIEW)
	gl.LoadIdentity()
	gl.Translatef(0, 0, -d)
	gl.Rotatef(Angle360.Y, 1, 0, 0)
	gl.Rotatef(Angle360.X, 0, 1, 0)
	gl.Translatef(-TargetPos.X, -TargetPos.Y, -TargetPos.Z)

}
Example #15
0
func draw() {
	xtrans := -xpos
	ztrans := -zpos
	ytrans := -walkbias - 0.25
	scenroty := 360.0 - yrot

	// Clear the screen and depth buffer
	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	// reset the view
	gl.LoadIdentity()

	// Rotate up and down to look up and down
	gl.Rotatef(lookupdown, 1.0, 0.0, 0.0)
	// Rotate depending on direction player is facing
	gl.Rotatef(scenroty, 0.0, 1.0, 0.0)
	// translate the scene based on player position
	gl.Translatef(xtrans, ytrans-1.75, ztrans)

	for _, chunk := range chunks {
		for y := 0; y < 16; y++ {
			for x := 0; x < 16; x++ {
				for z := 0; z <= 16; z++ {
					if len(chunk.Data[y][x]) > z && chunk.Data[y][x][z] != "" {
						gl.PushMatrix()
						gl.Translated(
							float64(16*chunk.X+x),
							float64(z),
							float64(16*chunk.Y+y))
						gl.CallList(cubes[chunk.Data[y][x][z]])
						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
		}
	}
}
Example #16
0
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")
	}

	pen := Pen{}

	gl.MatrixMode(gl.PROJECTION)

	gl.Viewport(0, 0, int(screen.W), int(screen.H))
	gl.LoadIdentity()
	gl.Ortho(0, float64(screen.W), float64(screen.H), 0, -1.0, 1.0)

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

	var running = true

	for running {

		for e := sdl.PollEvent(); e != nil; e = sdl.PollEvent() {
			switch ev := e.(type) {
			case *sdl.QuitEvent:
				running = false
			case *sdl.KeyboardEvent:
				if ev.Keysym.Sym == sdl.K_ESCAPE {
					running = false
				}
			case *sdl.MouseMotionEvent:
				if ev.State != 0 {
					pen.lineTo(Point{int(ev.X), int(ev.Y)})
				} else {
					pen.moveTo(Point{int(ev.X), int(ev.Y)})
				}
			}
		}

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

	sdl.Quit()

}
Example #17
0
func reshape(w, h int) {
	/* Because Gil specified "screen coordinates" (presumably with an
	   upper-left origin), this short bit of code sets up the coordinate
	   system to correspond to actual window coodrinates.  This code
	   wouldn't be required if you chose a (more typical in 3D) abstract
	   coordinate system. */

	gl.Viewport(0, 0, w, h)                       /* Establish viewing area to cover entire window. */
	gl.MatrixMode(gl.PROJECTION)                  /* Start modifying the projection matrix. */
	gl.LoadIdentity()                             /* Reset project matrix. */
	gl.Ortho(0, float64(w), 0, float64(h), -1, 1) /* Map abstract coords directly to window coords. */
	gl.Scalef(1, -1, 1)                           /* Invert Y axis so increasing Y goes down. */
	gl.Translatef(0, float32(-h), 0)              /* Shift origin up to upper-left corner. */
}
Example #18
0
func ResizeWindow(w int32, h int32) {
	// resizeWindow
	gl.MatrixMode(gl.PROJECTION)
	gl.Viewport(0, 0, gl.GLsizei(w), gl.GLsizei(h))
	gl.LoadIdentity()

	//	glu.Perspective( 45.0, ratio, 0.1, 100.0)

	aspect := gl.GLdouble(w) / gl.GLdouble(h)
	zNear := gl.GLdouble(0.1)
	zFar := gl.GLdouble(100.0)

	gl.Frustum(-NearHeight*aspect,
		NearHeight*aspect,
		-NearHeight,
		NearHeight, zNear, zFar)

	gl.MatrixMode(gl.MODELVIEW)
	gl.LoadIdentity()

	WinW = int(w)
	WinH = int(h)

}
// Here goes our drawing code
func drawGLScene(sector Sector) {
	xtrans := gl.GLfloat(-xpos)
	ztrans := gl.GLfloat(-zpos)
	ytrans := gl.GLfloat(-walkbias - 0.25)
	scenroty := gl.GLfloat(360.0 - yrot)

	// Clear the screen and depth buffer
	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	// reset the view
	gl.LoadIdentity()

	// Rotate up and down to look up and down
	gl.Rotatef(float32(lookupdown), 1.0, 0.0, 0.0)
	// Rotate depending on direction player is facing
	gl.Rotatef(float32(scenroty), 0.0, 1.0, 0.0)
	// translate the scene based on player position
	gl.Translatef(float32(xtrans), float32(ytrans), float32(ztrans))

	gl.BindTexture(gl.TEXTURE_2D, uint(textures[filter]))

	for _, vertices := range sector {
		gl.Begin(gl.TRIANGLES)
		for _, triangle := range *vertices {
			gl.Normal3f(0.0, 0.0, 1.0)
			gl.TexCoord2f(float32(triangle.u), float32(triangle.v))
			gl.Vertex3f(float32(triangle.x), float32(triangle.y), float32(triangle.z))
		}
		gl.End()
	}

	// Draw to the screen
	sdl.GL_SwapBuffers()

	// Gather our frames per second
	frames++
	t := sdl.GetTicks()
	if t-t0 >= 5000 {
		seconds := (t - t0) / 1000.0
		fps := frames / seconds
		fmt.Println(frames, "frames in", seconds, "seconds =", fps, "FPS")
		t0 = t
		frames = 0
	}
}
Example #20
0
func initWindow() {
	glut.IgnoreKeyRepeat(1)

	glut.DisplayFunc(display)
	glut.VisibilityFunc(visible)
	glut.KeyboardFunc(key)
	glut.KeyboardUpFunc(keyup)
	glut.SpecialFunc(special)
	glut.SpecialUpFunc(specialup)
	glut.JoystickFunc(joystick, 100)

	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	gl.Ortho(0, 40, 0, 40, 0, 40)
	gl.MatrixMode(gl.MODELVIEW)
	gl.PointSize(3.0)

	currentWindow = glut.GetWindow()
}
Example #21
0
func reshape(w, h int) {
	/* Because Gil specified "screen coordinates" (presumably with an
	   upper-left origin), this short bit of code sets up the coordinate
	   system to correspond to actual window coodrinates.  This code
	   wouldn't be required if you chose a (more typical in 3D) abstract
	   coordinate system. */
	gl.ClearColor(1, 1, 1, 1)
	//fmt.Println(gl.GetString(gl.EXTENSIONS))
	gl.Viewport(0, 0, w, h)                       /* Establish viewing area to cover entire window. */
	gl.MatrixMode(gl.PROJECTION)                  /* Start modifying the projection matrix. */
	gl.LoadIdentity()                             /* Reset project matrix. */
	gl.Ortho(0, float64(w), 0, float64(h), -1, 1) /* Map abstract coords directly to window coords. */
	gl.Scalef(1, -1, 1)                           /* Invert Y axis so increasing Y goes down. */
	gl.Translatef(0, float32(-h), 0)              /* Shift origin up to upper-left corner. */
	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	gl.Disable(gl.DEPTH_TEST)
	width, height = w, h
}
Example #22
0
func drawMass(m *phys.Mass, dsz gl.GLfloat) {

	gl.LoadIdentity()
	//	gl.Translatef( -1.5, 0.0, -6.0 )

	v := m.Pos
	gl.Translatef(gl.GLfloat(v.X), gl.GLfloat(v.Y), gl.GLfloat(v.Z))

	/* Rotate The Triangle On The Y axis ( NEW ) */
	// gl.Rotatef( rtri, 0.0, 1.0, 0.0 );

	gl.Begin(gl.TRIANGLES)       /* Drawing Using Triangles       */
	gl.Color3f(dsz, 0.0, 0.0)    /* Red                           */
	gl.Vertex3f(0.0, dsz, 0.0)   /* Top Of Triangle (Front)       */
	gl.Color3f(0.0, dsz, 0.0)    /* Green                         */
	gl.Vertex3f(-dsz, -dsz, dsz) /* Left Of Triangle (Front)      */
	gl.Color3f(0.0, 0.0, dsz)    /* Blue                          */
	gl.Vertex3f(dsz, -dsz, dsz)  /* Right Of Triangle (Front)     */

	gl.Color3f(dsz, 0.0, 0.0)    /* Red                           */
	gl.Vertex3f(0.0, dsz, 0.0)   /* Top Of Triangle (Right)       */
	gl.Color3f(0.0, 0.0, dsz)    /* Blue                          */
	gl.Vertex3f(dsz, -dsz, dsz)  /* Left Of Triangle (Right)      */
	gl.Color3f(0.0, dsz, 0.0)    /* Green                         */
	gl.Vertex3f(dsz, -dsz, -dsz) /* Right Of Triangle (Right)     */

	gl.Color3f(dsz, 0.0, 0.0)     /* Red                           */
	gl.Vertex3f(0.0, dsz, 0.0)    /* Top Of Triangle (Back)        */
	gl.Color3f(0.0, dsz, 0.0)     /* Green                         */
	gl.Vertex3f(dsz, -dsz, -dsz)  /* Left Of Triangle (Back)       */
	gl.Color3f(0.0, 0.0, dsz)     /* Blue                          */
	gl.Vertex3f(-dsz, -dsz, -dsz) /* Right Of Triangle (Back)      */

	gl.Color3f(dsz, 0.0, 0.0)     /* Red                           */
	gl.Vertex3f(0.0, dsz, 0.0)    /* Top Of Triangle (Left)        */
	gl.Color3f(0.0, 0.0, dsz)     /* Blue                          */
	gl.Vertex3f(-dsz, -dsz, -dsz) /* Left Of Triangle (Left)       */
	gl.Color3f(0.0, dsz, 0.0)     /* Green                         */
	gl.Vertex3f(-dsz, -dsz, dsz)  /* Right Of Triangle (Left)      */
	gl.End()                      /* Finished Drawing The Triangle */

}
Example #23
0
func drawCube(v *Vector3) {

	gl.LoadIdentity()
	//	gl.Translatef( -1.5, 0.0, -6.0 )
	gl.Translatef(gl.GLfloat(v.X), gl.GLfloat(v.Y), gl.GLfloat(v.Z))

	/* Rotate The Triangle On The Y axis ( NEW ) */
	// gl.Rotatef( rtri, 0.0, 1.0, 0.0 );

	gl.Begin(gl.TRIANGLES)       /* Drawing Using Triangles       */
	gl.Color3f(1.0, 0.0, 0.0)    /* Red                           */
	gl.Vertex3f(0.0, 1.0, 0.0)   /* Top Of Triangle (Front)       */
	gl.Color3f(0.0, 1.0, 0.0)    /* Green                         */
	gl.Vertex3f(-1.0, -1.0, 1.0) /* Left Of Triangle (Front)      */
	gl.Color3f(0.0, 0.0, 1.0)    /* Blue                          */
	gl.Vertex3f(1.0, -1.0, 1.0)  /* Right Of Triangle (Front)     */

	gl.Color3f(1.0, 0.0, 0.0)    /* Red                           */
	gl.Vertex3f(0.0, 1.0, 0.0)   /* Top Of Triangle (Right)       */
	gl.Color3f(0.0, 0.0, 1.0)    /* Blue                          */
	gl.Vertex3f(1.0, -1.0, 1.0)  /* Left Of Triangle (Right)      */
	gl.Color3f(0.0, 1.0, 0.0)    /* Green                         */
	gl.Vertex3f(1.0, -1.0, -1.0) /* Right Of Triangle (Right)     */

	gl.Color3f(1.0, 0.0, 0.0)     /* Red                           */
	gl.Vertex3f(0.0, 1.0, 0.0)    /* Top Of Triangle (Back)        */
	gl.Color3f(0.0, 1.0, 0.0)     /* Green                         */
	gl.Vertex3f(1.0, -1.0, -1.0)  /* Left Of Triangle (Back)       */
	gl.Color3f(0.0, 0.0, 1.0)     /* Blue                          */
	gl.Vertex3f(-1.0, -1.0, -1.0) /* Right Of Triangle (Back)      */

	gl.Color3f(1.0, 0.0, 0.0)     /* Red                           */
	gl.Vertex3f(0.0, 1.0, 0.0)    /* Top Of Triangle (Left)        */
	gl.Color3f(0.0, 0.0, 1.0)     /* Blue                          */
	gl.Vertex3f(-1.0, -1.0, -1.0) /* Left Of Triangle (Left)       */
	gl.Color3f(0.0, 1.0, 0.0)     /* Green                         */
	gl.Vertex3f(-1.0, -1.0, 1.0)  /* Right Of Triangle (Left)      */
	gl.End()                      /* Finished Drawing The Triangle */

	rtri = rtri + 0.2

}
// Here goes our drawing code
func drawGLScene() {
	// Clear the screen and depth buffer
	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	// reset the view
	gl.LoadIdentity()

	// Draw to the screen
	sdl.GL_SwapBuffers()

	// Gather our frames per second
	frames++
	t := sdl.GetTicks()
	if t-t0 >= 5000 {
		seconds := (t - t0) / 1000.0
		fps := frames / seconds
		fmt.Println(frames, "frames in", seconds, "seconds =", fps, "FPS")
		t0 = t
		frames = 0
	}
}
Example #25
0
func drawWin(d float) {

	gl.LoadIdentity()
	//	gl.LineWidth(5.0)
	//	gl.Enable(gl.POINT_SMOOTH)
	//	gl.Enable(gl.LINE_SMOOTH)
	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)

	if d > 1.0 {
		d = 1.0
	}

	c := WinColor

	gl.Color4f(gl.GLfloat(c[0]), gl.GLfloat(c[1]), gl.GLfloat(c[2]), gl.GLfloat(d))

	m := PlayArea * 4

	t := 1.0 * m
	b := -1.0 * m
	r := 1.0 * m
	l := -1.0 * m

	gl.Begin(gl.POLYGON)

	zo := -10.0

	gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(t), gl.GLfloat(zo))
	gl.Vertex3f(gl.GLfloat(r), gl.GLfloat(t), gl.GLfloat(zo))
	gl.Vertex3f(gl.GLfloat(r), gl.GLfloat(b), gl.GLfloat(zo))
	gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(b), gl.GLfloat(zo))
	gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(t), gl.GLfloat(zo))

	gl.End()
	gl.Disable(gl.BLEND)

}
Example #26
0
func (f *Font) DrawText3D(pos Vector3, color [3]byte, scale float, txt string) (endw int, endh int) {

	gl.LoadIdentity()
	// 	gl.Translatef(gl.GLfloat(pos.X), gl.GLfloat(pos.Y), gl.GLfloat(-4.99));
	gl.Translatef(gl.GLfloat(pos.X), gl.GLfloat(pos.Y), gl.GLfloat(-4.99))
	gl.Scalef(gl.GLfloat(1.0/64.0*scale), gl.GLfloat(1.0/64.0*scale), gl.GLfloat(1.0))
	gl.Disable(gl.DEPTH_TEST)

	texture, initial, intermediarya, intermediary, w, h := f.setupTextRendering(color, txt)

	wi := gl.GLfloat(w)
	he := gl.GLfloat(h)
	locX := gl.GLfloat(0) - wi*0.5
	locY := gl.GLfloat(0) - he*0.5

	/* Draw a quad at location */
	gl.Begin(gl.QUADS)
	/* Recall that the origin is in the lower-left corner
	   That is why the TexCoords specify different corners
	   than the Vertex coors seem to. */

	gl.Color4f(1.0, 1.0, 0.0, 1.0)

	gl.TexCoord2f(0.0, 1.0)
	gl.Vertex3f(locX, locY, 0.0)
	gl.TexCoord2f(1.0, 1.0)
	gl.Vertex3f(locX+wi, locY, 0.0)
	gl.TexCoord2f(1.0, 0.0)
	gl.Vertex3f(locX+wi, locY+he, 0.0)
	gl.TexCoord2f(0.0, 0.0)
	gl.Vertex3f(locX, locY+he, 0.0)
	gl.End()

	endw, endh = f.teardownTextRendering(texture, initial, intermediarya, intermediary)

	gl.Enable(gl.DEPTH_TEST)
	return
}
Example #27
0
// Here goes our drawing code
func drawGLScene() {
	// Clear the screen and depth buffer
	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	// Move left 1.5 units and into the screen 6.0 units.
	gl.LoadIdentity()
	gl.Translatef(-1.5, 0.0, -6.0)

	gl.Begin(gl.TRIANGLES)       // Draw triangles
	gl.Vertex3f(0.0, 1.0, 0.0)   // top
	gl.Vertex3f(-1.0, -1.0, 0.0) // bottom left
	gl.Vertex3f(1.0, -1.0, 0.0)  // bottom right
	gl.End()                     // finish drawing the triangle

	// Move right 3 units
	gl.Translatef(3.0, 0.0, 0.0)

	gl.Begin(gl.QUADS)           // draw quads
	gl.Vertex3f(-1.0, 1.0, 0.0)  // top left
	gl.Vertex3f(1.0, 1.0, 0.0)   // top right
	gl.Vertex3f(1.0, -1.0, 0.0)  // bottom right
	gl.Vertex3f(-1.0, -1.0, 0.0) // bottom left
	gl.End()                     // done drawing the quad

	// Draw to the screen
	sdl.GL_SwapBuffers()

	// Gather our frames per second
	frames++
	t := sdl.GetTicks()
	if t-t0 >= 5000 {
		seconds := (t - t0) / 1000.0
		fps := frames / seconds
		fmt.Println(frames, "frames in", seconds, "seconds =", fps, "FPS")
		t0 = t
		frames = 0
	}
}
Example #28
0
func drawCircle(t *trigger) {

	radius := float64(t.Size)
	pos := t.Pos

	gl.LoadIdentity()
	gl.Color4f(gl.GLfloat(t.Col[0]), gl.GLfloat(t.Col[1]), gl.GLfloat(t.Col[2]), gl.GLfloat(t.Col[3]))

	gl.LineWidth(2.0)
	gl.Translatef(gl.GLfloat(pos.X), gl.GLfloat(pos.Y), gl.GLfloat(pos.Z))

	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)

	gl.Begin(gl.POLYGON)

	for i := 0; i < 360; i++ {
		var degInRad float64 = float64(i) * DEG2RAD
		gl.Vertex3f(gl.GLfloat(math.Cos(degInRad)*radius), gl.GLfloat(math.Sin(degInRad)*radius), gl.GLfloat(0.0))
	}

	gl.End()
	gl.Disable(gl.BLEND)
}
Example #29
0
func main() {
	runtime.LockOSThread()
	flag.Parse()
	buildPalette()
	sdl.Init(sdl.INIT_VIDEO)
	defer sdl.Quit()

	sdl.GL_SetAttribute(sdl.GL_SWAP_CONTROL, 1)

	if sdl.SetVideoMode(512, 512, 32, sdl.OPENGL) == nil {
		panic("sdl error")
	}

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

	sdl.WM_SetCaption("Gomandel", "Gomandel")

	gl.Enable(gl.TEXTURE_2D)
	gl.Viewport(0, 0, 512, 512)
	gl.MatrixMode(gl.PROJECTION)
	gl.LoadIdentity()
	gl.Ortho(0, 512, 512, 0, -1, 1)

	gl.ClearColor(0, 0, 0, 0)

	//-----------------------------------------------------------------------------
	var dndDragging bool = false
	var dndStart Point
	var dndEnd Point
	var tex gl.Texture
	var tc TexCoords
	var lastProgress int
	initialRect := Rect{-1.5, -1.5, 3, 3}
	rect := initialRect

	rc := new(MandelbrotRequest)
	rc.MakeRequest(512, 512, rect)
	rc.WaitFor(Small, &tex, &tc)

	running := true
	e := new(sdl.Event)
	for running {
		for e.Poll() {
			switch e.Type {
			case sdl.QUIT:
				running = false
			case sdl.MOUSEBUTTONDOWN:
				dndDragging = true
				sdl.GetMouseState(&dndStart.X, &dndStart.Y)
				dndEnd = dndStart
			case sdl.MOUSEBUTTONUP:
				dndDragging = false
				sdl.GetMouseState(&dndEnd.X, &dndEnd.Y)
				if e.MouseButton().Button == 3 {
					rect = initialRect
				} else {
					rect = rectFromSelection(dndStart, dndEnd, 512, 512, rect)
					tc = texCoordsFromSelection(dndStart, dndEnd, 512, 512, tc)
				}

				// make request
				rc.MakeRequest(512, 512, rect)
			case sdl.MOUSEMOTION:
				if dndDragging {
					sdl.GetMouseState(&dndEnd.X, &dndEnd.Y)
				}
			}
		}

		// if we're waiting for a result, check if it's ready
		p := rc.Update(&tex, &tc)
		if p != -1 {
			lastProgress = p
		}

		gl.Clear(gl.COLOR_BUFFER_BIT)
		tex.Bind(gl.TEXTURE_2D)
		drawQuad(0, 0, 512, 512, tc.TX, tc.TY, tc.TX2, tc.TY2)
		gl.BindTexture(gl.TEXTURE_2D, 0)
		if dndDragging {
			drawSelection(dndStart, dndEnd)
		}
		drawProgress(512, 512, lastProgress, rc.Pending)
		sdl.GL_SwapBuffers()
	}
}
Example #30
0
// Here goes our drawing code
func drawGLScene() {
	// Clear the screen and depth buffer
	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

	// Move left 1.5 units and into the screen 6.0 units.
	gl.LoadIdentity()
	gl.Translatef(0.0, 0.0, -7.0)

	gl.Rotatef(float32(xrot), 1.0, 0.0, 0.0) /* Rotate On The X Axis */
	gl.Rotatef(float32(yrot), 0.0, 1.0, 0.0) /* Rotate On The Y Axis */
	gl.Rotatef(float32(zrot), 0.0, 0.0, 1.0) /* Rotate On The Z Axis */

	/* Select Our Texture */
	gl.BindTexture(gl.TEXTURE_2D, uint(texture))

	gl.Begin(gl.QUADS) // Draw a quad
	/* Front Face */
	gl.TexCoord2f(0.0, 1.0)
	gl.Vertex3f(-1.0, -1.0, 1.0) // Bottom left
	gl.TexCoord2f(1.0, 1.0)
	gl.Vertex3f(1.0, -1.0, 1.0) // Bottom right
	gl.TexCoord2f(1.0, 0.0)
	gl.Vertex3f(1.0, 1.0, 1.0) // Top right
	gl.TexCoord2f(0.0, 0.0)
	gl.Vertex3f(-1.0, 1.0, 1.0) // Top left

	/* Back Face */
	gl.TexCoord2f(0.0, 0.0)
	gl.Vertex3f(-1.0, -1.0, -1.0) // Bottom right
	gl.TexCoord2f(0.0, 1.0)
	gl.Vertex3f(-1.0, 1.0, -1.0) // Top right
	gl.TexCoord2f(1.0, 1.0)
	gl.Vertex3f(1.0, 1.0, -1.0) // Top left
	gl.TexCoord2f(1.0, 0.0)
	gl.Vertex3f(1.0, -1.0, -1.0) // Bottom left

	/* Top Face */
	gl.TexCoord2f(1.0, 1.0)
	gl.Vertex3f(-1.0, 1.0, -1.0) // Top left
	gl.TexCoord2f(1.0, 0.0)
	gl.Vertex3f(-1.0, 1.0, 1.0) // Bottom left
	gl.TexCoord2f(0.0, 0.0)
	gl.Vertex3f(1.0, 1.0, 1.0) // Bottom right
	gl.TexCoord2f(0.0, 1.0)
	gl.Vertex3f(1.0, 1.0, -1.0) // Top right

	/* Bottom Face */
	gl.TexCoord2f(0.0, 1.0)
	gl.Vertex3f(-1.0, -1.0, -1.0) // Top right
	gl.TexCoord2f(1.0, 1.0)
	gl.Vertex3f(1.0, -1.0, -1.0) // Top left
	gl.TexCoord2f(1.0, 0.0)
	gl.Vertex3f(1.0, -1.0, 1.0) // Bottom left
	gl.TexCoord2f(0.0, 0.0)
	gl.Vertex3f(-1.0, -1.0, 1.0) // Bottom right

	/* Right face */
	gl.TexCoord2f(0.0, 0.0)
	gl.Vertex3f(1.0, -1.0, -1.0) // Bottom right
	gl.TexCoord2f(0.0, 1.0)
	gl.Vertex3f(1.0, 1.0, -1.0) // Top right
	gl.TexCoord2f(1.0, 1.0)
	gl.Vertex3f(1.0, 1.0, 1.0) // Top left
	gl.TexCoord2f(1.0, 0.0)
	gl.Vertex3f(1.0, -1.0, 1.0) // Bottom left

	/* Left Face */
	gl.TexCoord2f(1.0, 0.0)
	gl.Vertex3f(-1.0, -1.0, -1.0) // Bottom left
	gl.TexCoord2f(0.0, 0.0)
	gl.Vertex3f(-1.0, -1.0, 1.0) // Bottom right
	gl.TexCoord2f(0.0, 1.0)
	gl.Vertex3f(-1.0, 1.0, 1.0) // Top right
	gl.TexCoord2f(1.0, 1.0)
	gl.Vertex3f(-1.0, 1.0, -1.0) // Top left
	gl.End()                     // done drawing the quad

	// Draw to the screen
	sdl.GL_SwapBuffers()

	xrot += 0.3 /* X Axis Rotation */
	yrot += 0.2 /* Y Axis Rotation */
	zrot += 0.4 /* Z Axis Rotation */

	// Gather our frames per second
	frames++
	t := sdl.GetTicks()
	if t-t0 >= 5000 {
		seconds := (t - t0) / 1000.0
		fps := frames / seconds
		fmt.Println(frames, "frames in", seconds, "seconds =", fps, "FPS")
		t0 = t
		frames = 0
	}
}