Example #1
0
func (r *GlowRenderer) Draw() (err error) {
	gl.UseProgram(r.shader)
	gl.Uniform1i(r.textureUnitLoc, 0)
	gl.BindBuffer(gl.ARRAY_BUFFER, r.coords)
	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))
	gl.Uniform1i(r.blurAmountLoc, int32(r.blur))
	gl.Uniform1f(r.blurScaleLoc, r.scale)
	gl.Uniform1f(r.blurStrengthLoc, r.strength)
	gl.Uniform2f(r.bufferDimensionsLoc, float32(r.width), float32(r.height))

	gl.BindFramebuffer(gl.FRAMEBUFFER, r.BlurFb)
	gl.Viewport(0, 0, int32(r.width), int32(r.height))
	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, r.GlowTex)
	gl.Uniform1i(r.orientationLoc, 0)
	gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)
	gl.BindFramebuffer(gl.FRAMEBUFFER, 0)

	gl.Viewport(0, 0, int32(r.oldwidth), int32(r.oldheight))
	gl.BlendFunc(gl.ONE, gl.ONE)
	gl.BindTexture(gl.TEXTURE_2D, r.BlurTex)
	gl.Uniform1i(r.orientationLoc, 1)
	gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)

	gl.BindBuffer(gl.ARRAY_BUFFER, 0)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	return nil
}
Example #2
0
func (t *Text) Draw() {
	if t.IsDebug {
		t.BoundingBox.Draw()
	}
	gl.UseProgram(t.font.program)

	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, t.font.textureID)

	// uniforms
	gl.Uniform1i(t.font.fragmentTextureUniform, 0)
	gl.Uniform4fv(t.font.colorUniform, 1, &t.color[0])
	gl.Uniform2fv(t.font.finalPositionUniform, 1, &t.finalPosition[0])
	gl.UniformMatrix4fv(t.font.orthographicMatrixUniform, 1, false, &t.font.OrthographicMatrix[0])
	gl.UniformMatrix4fv(t.font.scaleMatrixUniform, 1, false, &t.scaleMatrix[0])

	// draw
	drawCount := int32(t.RuneCount * 6)
	if drawCount > int32(t.eboIndexCount) {
		drawCount = int32(t.eboIndexCount)
	}
	if drawCount < 0 {
		drawCount = 0
	}
	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	gl.BindVertexArray(t.vao)
	gl.DrawElements(gl.TRIANGLES, drawCount, gl.UNSIGNED_INT, nil)
	gl.BindVertexArray(0)
	gl.Disable(gl.BLEND)
}
// renders the display on each update
func render() {
	gl.Clear(gl.COLOR_BUFFER_BIT)
	gl.Enable(gl.BLEND)
	gl.Enable(gl.POINT_SMOOTH)
	gl.Enable(gl.LINE_SMOOTH)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	gl.LoadIdentity()

	// draw pipes
	for _, pipeBox := range pipe {
		gl.PushMatrix()
		pos := pipeBox.Body.Position()
		gl.Translatef(float32(pos.X), float32(pos.Y), 0.0)
		drawSquare(.19, .8, .19, 1) // limegreen
		gl.PopMatrix()
	}

	// draw flappy
	for _, flappyBird := range flappyBirds {
		gl.PushMatrix()
		pos := flappyBird.Body.Position()
		gl.Translatef(float32(pos.X), float32(pos.Y), 0.0)
		drawSquare(1, .84, 0, 1) // gold
		gl.PopMatrix()
	}

	gl.Color4f(1, 0, 1, 1)
	scoreStr := "[ Score: " + strconv.Itoa(score) + " ]"
	// draw score
	drawScore(scoreStr)
}
Example #4
0
func (r *EffectsRenderer) Draw() (err error) {
	gl.UseProgram(r.shader)
	gl.Uniform1i(r.textureUnitLoc, 0)
	gl.Uniform3f(r.colorLoc, r.Color[0], r.Color[1], r.Color[2])
	gl.BindBuffer(gl.ARRAY_BUFFER, r.coords)
	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))

	gl.BindFramebuffer(gl.FRAMEBUFFER, 0)
	gl.Viewport(0, 0, int32(r.oldwidth), int32(r.oldheight))
	gl.BlendFunc(gl.ONE, gl.ONE)
	gl.BindTexture(gl.TEXTURE_2D, r.texture)
	gl.DrawArrays(gl.TRIANGLE_STRIP, 0, 4)

	gl.BindBuffer(gl.ARRAY_BUFFER, 0)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	return nil
}
Example #5
0
func CreateBuffers() {

	var err error
	program, err = MakeProgram(VertexShader(), FragmentShader())
	// defer program.Delete()

	if err != nil {
		fmt.Println("Error loading shaders: " + err.Error())
		panic("error loading shaders")
	}

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

	MVPid = gl.GetUniformLocation(program, gl.Str("MVP\x00"))
	lightpositionID = gl.GetUniformLocation(program, gl.Str("light.position\x00"))
	lightintensitiesID = gl.GetUniformLocation(program, gl.Str("light.intensities\x00"))
	lightattenuationID = gl.GetUniformLocation(program, gl.Str("light.attenuation\x00"))
	lightambientCoeficientID = gl.GetUniformLocation(program, gl.Str("light.ambientCoeficient\x00"))

	cameraPositionID = gl.GetUniformLocation(program, gl.Str("cameraPosition\x00"))

	// View := mathgl.LookAt(0.0, 0.0, 5.0, 0.0, 0.0, 0.0, 0.0, 1.0, 0.0)

	// viewM = View

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

	// var vao uint32
	gl.GenVertexArrays(1, &vao)
	gl.BindVertexArray(vao)

	// var vbo uint32
	gl.GenBuffers(1, &vbo)

	// gl.GenBuffers(1, &elementvbo)
	// fmt.Println(program)
	gl.UseProgram(program)

	for idx, img := range aggregateImages {
		bindAggregateImage(img, idx)

	}

}
Example #6
0
// RenderString must be called on the render thread.  x and y are the initial position of the pen,
// in screen coordinates, and height is the height of a full line of text, in screen coordinates.
func (d *Dictionary) RenderString(str string, x, y, height float64) {
	if str == "" {
		return
	}
	// No synchronization necessary because everything is run serially on the render thread anyway.
	if d.strs == nil {
		d.strs = make(map[string]strData)
	}
	data, ok := d.strs[str]
	if !ok {
		data = d.bindString(str)
		d.strs[str] = data
	}

	render.EnableShader("glop.font")
	defer render.EnableShader("")

	gl.ActiveTexture(gl.TEXTURE0)
	gl.BindTexture(gl.TEXTURE_2D, d.atlas.texture)
	location, _ := render.GetUniformLocation("glop.font", "tex")
	gl.Uniform1i(location, 0)
	gl.BindSampler(0, d.atlas.sampler)

	location, _ = render.GetUniformLocation("glop.font", "height")
	gl.Uniform1f(location, float32(height))

	var viewport [4]int32
	gl.GetIntegerv(gl.VIEWPORT, &viewport[0])
	location, _ = render.GetUniformLocation("glop.font", "screen")
	gl.Uniform2f(location, float32(viewport[2]), float32(viewport[3]))

	location, _ = render.GetUniformLocation("glop.font", "pen")
	gl.Uniform2f(location, float32(x)+float32(viewport[0]), float32(y)+float32(viewport[1]))

	location, _ = render.GetUniformLocation("glop.font", "textColor")
	gl.Uniform3f(location, d.color[0], d.color[1], d.color[2])

	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	gl.BindVertexArray(data.varrays[0])
	gl.DrawArrays(gl.TRIANGLES, 0, data.count)
}
Example #7
0
func (c *Context) CreateWindow(w, h int, name string) (err error) {
	c.w = w
	c.h = h
	c.name = name
	c.createWindow()
	c.SetCursor(c.cursor)
	gl.Init()
	if e := gl.GetError(); e != 0 {
		if e != gl.INVALID_ENUM {
			err = fmt.Errorf("OpenGL glInit error: %X\n", e)
			return
		}
	}
	c.OpenGLVersion = glfw.GetVersionString()
	c.ShaderVersion = gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION))
	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	gl.ClearColor(0.0, 0.0, 0.0, 1.0)
	gl.Disable(gl.CULL_FACE)
	glfw.SwapInterval(1)
	return
}
Example #8
0
func (c *Context) CreateWindow(w, h int, name string) (err error) {
	c.w = w
	c.h = h
	c.name = name
	var monitor *glfw.Monitor
	if c.fullscreen == true {
		monitor = glfw.GetPrimaryMonitor()
	}
	if c.window, err = glfw.CreateWindow(c.w, c.h, c.name, monitor, nil); err != nil {
		return
	}
	if c.cursor == false {
		c.window.SetInputMode(glfw.CursorMode, glfw.CursorHidden)
	}
	c.window.MakeContextCurrent()
	gl.Init()
	if e := gl.GetError(); e != 0 {
		if e == gl.INVALID_ENUM {
			fmt.Printf("GL_INVALID_ENUM when calling glInit\n")
		} else {
			err = fmt.Errorf("OpenGL glInit error: %X\n", e)
			return
		}
	}
	c.OpenGLVersion = glfw.GetVersionString()
	c.ShaderVersion = gl.GoStr(gl.GetString(gl.SHADING_LANGUAGE_VERSION))
	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	gl.ClearColor(0.0, 0.0, 0.0, 1.0)
	gl.Disable(gl.CULL_FACE)
	glfw.SwapInterval(1)
	if c.VAO, err = CreateVAO(); err != nil {
		return
	}
	gl.BindVertexArray(c.VAO)
	c.Events = NewEventHandler(c.window)
	return
}
Example #9
0
func Init() error {
	if err := gl.Init(); err != nil {
		return err
	}

	log.Printf("OpenGL version: %s", gl.GoStr(gl.GetString(gl.VERSION)))

	vs, err := asset.String("shader.vert")
	if err != nil {
		return err
	}

	fs, err := asset.String("shader.frag")
	if err != nil {
		return err
	}

	program, err := createProgram(vs, fs)
	if err != nil {
		return err
	}
	gl.UseProgram(program)

	var shaderErr error
	uniform := func(name string) int32 {
		var loc int32
		loc, shaderErr = getUniformLocation(program, name)
		return loc
	}

	projectionViewMatrixUniform = uniform("u_projectionViewMatrix")
	modelMatrixUniform = uniform("u_modelMatrix")
	normalMatrixUniform = uniform("u_normalMatrix")
	ambientLightColorUniform = uniform("u_ambientLightColor")
	directionalLightColorUniform = uniform("u_directionalLightColor")
	directionalVectorUniform = uniform("u_directionalVector")
	textureUniform = uniform("u_texture")
	grayscaleUniform = uniform("u_grayscale")
	brightnessUniform = uniform("u_brightness")
	alphaUniform = uniform("u_alpha")
	mixColorUniform = uniform("u_mixColor")
	mixAmountUniform = uniform("u_mixAmount")

	if shaderErr != nil {
		return shaderErr
	}

	vm := newViewMatrix(cameraPosition, targetPosition, up)
	nm := vm.inverse().transpose()
	gl.UniformMatrix4fv(normalMatrixUniform, 1, false, &nm[0])

	gl.Uniform3fv(ambientLightColorUniform, 1, &ambientLightColor[0])
	gl.Uniform3fv(directionalLightColorUniform, 1, &directionalLightColor[0])
	gl.Uniform3fv(directionalVectorUniform, 1, &directionalVector[0])

	SizeCallback = func(width, height int) {
		if winWidth == width && winHeight == height {
			return
		}

		log.Printf("window size changed (%dx%d -> %dx%d)", int(winWidth), int(winHeight), width, height)
		gl.Viewport(0, 0, int32(width), int32(height))

		// Calculate new perspective projection view matrix.
		winWidth, winHeight = width, height
		fw, fh := float32(width), float32(height)
		aspect := fw / fh
		fovRadians := float32(math.Pi) / 3
		perspectiveProjectionViewMatrix = vm.mult(newPerspectiveMatrix(fovRadians, aspect, 1, 2000))

		// Calculate new ortho projection view matrix.
		orthoProjectionViewMatrix = newOrthoMatrix(fw, fh, fw /* use width as depth */)
	}

	if err := initMeshes(); err != nil {
		return err
	}

	if err := initTextures(); err != nil {
		return err
	}

	gl.Enable(gl.CULL_FACE)
	gl.CullFace(gl.BACK)

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

	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
	gl.ClearColor(0, 0, 0, 0)

	return nil
}
Example #10
0
func InitGL() error {
	defer tlog.FuncLog(tlog.Func("InitGL"))

	err := gl.Init()
	if err != nil {
		return err
	}
	gl.GetError() // cleanup gl error state

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

	gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
	Check()
	gl.ReadBuffer(gl.BACK)
	Check()
	gl.DrawBuffer(gl.BACK)
	Check()

	gl.FrontFace(gl.CW)
	Check()
	gl.CullFace(gl.BACK)
	Check()
	gl.Disable(gl.CULL_FACE)
	Check()

	gl.ClearColor(1, 1, 0.5, 0)
	Check()
	gl.ClearDepth(1.0)
	Check()
	gl.ClearStencil(0)
	Check()

	gl.Disable(gl.STENCIL_TEST)
	Check()
	gl.StencilMask(0xFFFFFFFF)
	Check()
	gl.StencilFunc(gl.EQUAL, 0x00000000, 0x00000001)
	Check()
	gl.StencilOp(gl.KEEP, gl.KEEP, gl.KEEP)
	Check()

	gl.Disable(gl.DITHER)
	Check()

	gl.Enable(gl.DEPTH_TEST)
	Check()
	gl.DepthFunc(gl.LEQUAL)
	Check()
	gl.DepthMask(true)
	Check()
	gl.DepthRange(0., 1.)
	Check()
	gl.Enable(gl.DEPTH_CLAMP)
	Check()

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

	ForceCheck()
	return nil
}