Exemple #1
0
// SetActive will set current camera as the render camera
func (cam *Camera) SetActive() {
	state.activeCam = cam
	if shader := shader.GetActive(); shader != nil {
		gl.UniformMatrix4fv(shader.Projection, 1, false, &cam.projection[0])
		gl.UniformMatrix4fv(shader.Camera, 1, false, &cam.loc[0])
	}
}
Exemple #2
0
// Load loads and sets up the model
func (m *Model) Load(fileName string) {

	m.loadFile(fileName)

	shader := sm.Shader{VertSrcFile: m.data.VertShaderFile, FragSrcFile: m.data.FragShaderFile, Name: fmt.Sprintf("%s:%s", m.data.VertShaderFile, m.data.FragShaderFile)}
	program, err := m.shaders.LoadProgram(shader, false)
	if err != nil {
		return
	}
	m.currentProgram = program

	gl.UseProgram(m.currentProgram)

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

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

	m.modelUniform = gl.GetUniformLocation(m.currentProgram, gl.Str("model\x00"))
	gl.UniformMatrix4fv(m.modelUniform, 1, false, &m.model[0])

	m.textureUniform = gl.GetUniformLocation(m.currentProgram, gl.Str("tex\x00"))
	gl.Uniform1i(m.textureUniform, 0)

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

	// Load the texture
	m.textures.LoadTexture(m.data.TextureFile, m.data.TextureFile)

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

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

	vertAttrib := uint32(gl.GetAttribLocation(m.currentProgram, gl.Str("vert\x00")))
	gl.EnableVertexAttribArray(vertAttrib)
	gl.VertexAttribPointer(vertAttrib, 3, gl.FLOAT, false, m.data.VertSize*4, gl.PtrOffset(0)) // 4:number of bytes in a float32

	texCoordAttrib := uint32(gl.GetAttribLocation(m.currentProgram, gl.Str("vertTexCoord\x00")))
	gl.EnableVertexAttribArray(texCoordAttrib)
	gl.VertexAttribPointer(texCoordAttrib, 2, gl.FLOAT, true, m.data.VertSize*4, gl.PtrOffset(3*4)) // 4:number of bytes in a float32

	if m.data.Indexed {
		var indices uint32
		gl.GenBuffers(1, &indices)
		gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, indices)
		gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, len(m.data.Indices)*4, gl.Ptr(m.data.Indices), gl.STATIC_DRAW)
	}

	gl.BindVertexArray(0)
}
Exemple #3
0
// Render renders the model
func (m *Model) Render() {

	gl.UseProgram(m.currentProgram)
	gl.UniformMatrix4fv(m.modelUniform, 1, false, &m.model[0])

	gl.BindVertexArray(m.vao)

	gl.ActiveTexture(gl.TEXTURE0)

	texture, isLoaded := m.textures.GetTexture(m.data.TextureFile)

	if isLoaded {
		gl.BindTexture(gl.TEXTURE_2D, texture)
	} else {
		if m.data.TextureFile != "" {
			go fmt.Printf("Unable to load texture %s", m.data.TextureFile)
		}
	}

	if m.data.Indexed {
		gl.DrawElements(gl.TRIANGLE_FAN, int32(len(m.data.Indices)), gl.UNSIGNED_INT, gl.PtrOffset(0))
	} else {
		gl.DrawArrays(gl.TRIANGLES, 0, int32(len(m.data.Verts))/m.data.VertSize)
	}

	gl.BindVertexArray(0)
}
Exemple #4
0
func setupUniforms(shader *renderer.Shader) {
	for name, uniform := range shader.Uniforms {
		uniformLocation := gl.GetUniformLocation(shader.Program, gl.Str(name+"\x00"))
		switch t := uniform.(type) {
		case bool:
			if t {
				gl.Uniform1i(uniformLocation, 1)
			} else {
				gl.Uniform1i(uniformLocation, 0)
			}
		case float32:
			gl.Uniform1f(uniformLocation, t)
		case float64:
			gl.Uniform1f(uniformLocation, float32(t))
		case int32:
			gl.Uniform1i(uniformLocation, t)
		case int:
			gl.Uniform1i(uniformLocation, int32(t))
		case mgl32.Vec2:
			gl.Uniform2f(uniformLocation, t[0], t[1])
		case mgl32.Vec3:
			gl.Uniform3f(uniformLocation, t[0], t[1], t[2])
		case mgl32.Vec4:
			gl.Uniform4f(uniformLocation, t[0], t[1], t[2], t[3])
		case mgl32.Mat4:
			gl.UniformMatrix4fv(uniformLocation, 1, false, &t[0])
		case []float32:
			gl.Uniform4fv(uniformLocation, (int32)(len(t)), &t[0])
		case []int32:
			gl.Uniform4iv(uniformLocation, (int32)(len(t)), &t[0])
		default:
			fmt.Printf("unexpected type for shader uniform: %T\n", t)
		}
	}
}
Exemple #5
0
func (c *Camera) Draw(program uint32) {
	//c.UpdateCamera()

	camera := mgl32.LookAtV(c.position, c.position.Add(c.direction), c.up)
	cameraUniform := gl.GetUniformLocation(program, gl.Str("camera\x00"))
	gl.UniformMatrix4fv(cameraUniform, 1, false, &camera[0])

}
Exemple #6
0
func (me *test) Display(c *Core) {
	me.o1.Draw(c)
	me.o2.Draw(c)

	projection := mgl32.Perspective(mgl32.DegToRad(Fov), float32(WindowWidth)/WindowHeight, Near, Far)
	view := mgl32.LookAtV(mgl32.Vec3{3, 3, 3}, mgl32.Vec3{0, 0, 0}, mgl32.Vec3{0, 1, 0})
	model := mgl32.Ident4()
	MVP := projection.Mul4(view).Mul4(model)

	gl.UniformMatrix4fv(mvpLoc, 1, false, &MVP[0])
	gl.Uniform1i(TexLoc, 0)

}
Exemple #7
0
// 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)
}
Exemple #8
0
// 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)
}
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
}
Exemple #10
0
func programLoop(window *glfw.Window) error {

	// the linked shader program determines how the data will be rendered
	vertShader, err := gfx.NewShaderFromFile("shaders/basic.vert", gl.VERTEX_SHADER)
	if err != nil {
		return err
	}

	fragShader, err := gfx.NewShaderFromFile("shaders/basic.frag", gl.FRAGMENT_SHADER)
	if err != nil {
		return err
	}

	program, err := gfx.NewProgram(vertShader, fragShader)
	if err != nil {
		return err
	}
	defer program.Delete()

	vertices := []float32{
		// position        // texture position
		-0.5, -0.5, -0.5, 0.0, 0.0,
		0.5, -0.5, -0.5, 1.0, 0.0,
		0.5, 0.5, -0.5, 1.0, 1.0,
		0.5, 0.5, -0.5, 1.0, 1.0,
		-0.5, 0.5, -0.5, 0.0, 1.0,
		-0.5, -0.5, -0.5, 0.0, 0.0,

		-0.5, -0.5, 0.5, 0.0, 0.0,
		0.5, -0.5, 0.5, 1.0, 0.0,
		0.5, 0.5, 0.5, 1.0, 1.0,
		0.5, 0.5, 0.5, 1.0, 1.0,
		-0.5, 0.5, 0.5, 0.0, 1.0,
		-0.5, -0.5, 0.5, 0.0, 0.0,

		-0.5, 0.5, 0.5, 1.0, 0.0,
		-0.5, 0.5, -0.5, 1.0, 1.0,
		-0.5, -0.5, -0.5, 0.0, 1.0,
		-0.5, -0.5, -0.5, 0.0, 1.0,
		-0.5, -0.5, 0.5, 0.0, 0.0,
		-0.5, 0.5, 0.5, 1.0, 0.0,

		0.5, 0.5, 0.5, 1.0, 0.0,
		0.5, 0.5, -0.5, 1.0, 1.0,
		0.5, -0.5, -0.5, 0.0, 1.0,
		0.5, -0.5, -0.5, 0.0, 1.0,
		0.5, -0.5, 0.5, 0.0, 0.0,
		0.5, 0.5, 0.5, 1.0, 0.0,

		-0.5, -0.5, -0.5, 0.0, 1.0,
		0.5, -0.5, -0.5, 1.0, 1.0,
		0.5, -0.5, 0.5, 1.0, 0.0,
		0.5, -0.5, 0.5, 1.0, 0.0,
		-0.5, -0.5, 0.5, 0.0, 0.0,
		-0.5, -0.5, -0.5, 0.0, 1.0,

		-0.5, 0.5, -0.5, 0.0, 1.0,
		0.5, 0.5, -0.5, 1.0, 1.0,
		0.5, 0.5, 0.5, 1.0, 0.0,
		0.5, 0.5, 0.5, 1.0, 0.0,
		-0.5, 0.5, 0.5, 0.0, 0.0,
		-0.5, 0.5, -0.5, 0.0, 1.0,
	}

	indices := []uint32{}

	VAO := createVAO(vertices, indices)
	texture0, err := gfx.NewTextureFromFile("../images/RTS_Crate.png",
		gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
	if err != nil {
		panic(err.Error())
	}

	texture1, err := gfx.NewTextureFromFile("../images/trollface-transparent.png",
		gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
	if err != nil {
		panic(err.Error())
	}

	cubePositions := [][]float32{
		[]float32{0.0, 0.0, -3.0},
		[]float32{2.0, 5.0, -15.0},
		[]float32{-1.5, -2.2, -2.5},
		[]float32{-3.8, -2.0, -12.3},
		[]float32{2.4, -0.4, -3.5},
		[]float32{-1.7, 3.0, -7.5},
		[]float32{1.3, -2.0, -2.5},
		[]float32{1.5, 2.0, -2.5},
		[]float32{1.5, 0.2, -1.5},
		[]float32{-1.3, 1.0, -1.5},
	}

	gl.Enable(gl.DEPTH_TEST)

	for !window.ShouldClose() {
		// poll events and call their registered callbacks
		glfw.PollEvents()

		// background color
		gl.ClearColor(0.2, 0.5, 0.5, 1.0)
		gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)

		// draw vertices
		program.Use()

		// set texture0 to uniform0 in the fragment shader
		texture0.Bind(gl.TEXTURE0)
		texture0.SetUniform(program.GetUniformLocation("ourTexture0"))

		// set texture1 to uniform1 in the fragment shader
		texture1.Bind(gl.TEXTURE1)
		texture1.SetUniform(program.GetUniformLocation("ourTexture1"))

		// update shader transform matrices

		// Create transformation matrices
		rotateX := (mgl32.Rotate3DX(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
		rotateY := (mgl32.Rotate3DY(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
		rotateZ := (mgl32.Rotate3DZ(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))

		viewTransform := mgl32.Translate3D(0, 0, -3)
		projectTransform := mgl32.Perspective(mgl32.DegToRad(60), windowWidth/windowHeight, 0.1, 100.0)

		gl.UniformMatrix4fv(program.GetUniformLocation("view"), 1, false,
			&viewTransform[0])
		gl.UniformMatrix4fv(program.GetUniformLocation("project"), 1, false,
			&projectTransform[0])

		gl.UniformMatrix4fv(program.GetUniformLocation("worldRotateX"), 1, false,
			&rotateX[0])
		gl.UniformMatrix4fv(program.GetUniformLocation("worldRotateY"), 1, false,
			&rotateY[0])
		gl.UniformMatrix4fv(program.GetUniformLocation("worldRotateZ"), 1, false,
			&rotateZ[0])

		gl.BindVertexArray(VAO)

		for _, pos := range cubePositions {

			worldTranslate := mgl32.Translate3D(pos[0], pos[1], pos[2])
			worldTransform := (worldTranslate.Mul4(rotateX.Mul3(rotateY).Mul3(rotateZ).Mat4()))

			gl.UniformMatrix4fv(program.GetUniformLocation("world"), 1, false,
				&worldTransform[0])

			gl.DrawArrays(gl.TRIANGLES, 0, 36)
		}
		// gl.DrawElements(gl.TRIANGLES, 36, gl.UNSIGNED_INT, unsafe.Pointer(nil))
		gl.BindVertexArray(0)

		texture0.UnBind()
		texture1.UnBind()

		// end of draw loop

		// swap in the rendered buffer
		window.SwapBuffers()
	}

	return nil
}
Exemple #11
0
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)

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

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

		// Maintenance
		window.SwapBuffers()
		glfw.PollEvents()
	}
}
Exemple #12
0
func Main() {
	err := glfw.Init()
	if err != nil {
		panic(err)
	}
	defer glfw.Terminate()

	glfw.WindowHint(glfw.Resizable, glfw.False)
	glfw.WindowHint(glfw.ContextVersionMajor, 3)
	glfw.WindowHint(glfw.ContextVersionMinor, 2)
	glfw.WindowHint(glfw.OpenGLProfile, glfw.OpenGLCoreProfile)
	glfw.WindowHint(glfw.OpenGLForwardCompatible, glfw.True)
	window, err := glfw.CreateWindow(WindowWidth, WindowHeight, "Cube", nil, nil)
	Window = window
	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("SimpleVertexShader.vertexshader", "SimpleFragmentShader.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"))
	// 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()

	width, height := window.GetSize()
	window.SetCursorPos(float64(width/2), float64(height/2))
	window.SetKeyCallback(input.OnKey)
	window.SetCursorPosCallback(input.OnCursor)
	window.SetMouseButtonCallback(input.OnMouse)

	meshes.LoadColladaCube("cube.dae")

	for !player.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])
		player.MainPlayer.Draw(program)
		for _, element := range game.Universe {
			(element).Draw(program)
		}

		// Maintenance
		window.SwapBuffers()
		glfw.PollEvents()
	}
}
Exemple #13
0
func programLoop(window *win.Window) error {

	// the linked shader program determines how the data will be rendered
	vertShader, err := gfx.NewShaderFromFile("shaders/basic.vert", gl.VERTEX_SHADER)
	if err != nil {
		return err
	}

	fragShader, err := gfx.NewShaderFromFile("shaders/basic.frag", gl.FRAGMENT_SHADER)
	if err != nil {
		return err
	}

	program, err := gfx.NewProgram(vertShader, fragShader)
	if err != nil {
		return err
	}
	defer program.Delete()

	VAO := createVAO(cubeVertices, nil)
	texture0, err := gfx.NewTextureFromFile("../images/RTS_Crate.png",
		gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
	if err != nil {
		panic(err.Error())
	}

	texture1, err := gfx.NewTextureFromFile("../images/trollface-transparent.png",
		gl.CLAMP_TO_EDGE, gl.CLAMP_TO_EDGE)
	if err != nil {
		panic(err.Error())
	}

	// 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(0.2, 0.5, 0.5, 1.0)
		gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT) // depth buffer needed for DEPTH_TEST

		program.Use()

		// bind textures
		texture0.Bind(gl.TEXTURE0)
		texture0.SetUniform(program.GetUniformLocation("ourTexture0"))

		texture1.Bind(gl.TEXTURE1)
		texture1.SetUniform(program.GetUniformLocation("ourTexture1"))

		// cube rotation matrices
		rotateX := (mgl32.Rotate3DX(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
		rotateY := (mgl32.Rotate3DY(mgl32.DegToRad(-60 * float32(glfw.GetTime()))))
		rotateZ := (mgl32.Rotate3DZ(mgl32.DegToRad(-60 * 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()
		gl.UniformMatrix4fv(program.GetUniformLocation("camera"), 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
		for _, pos := range cubePositions {
			worldTranslate := mgl32.Translate3D(pos[0], pos[1], pos[2])
			worldTransform := (worldTranslate.Mul4(rotateX.Mul3(rotateY).Mul3(rotateZ).Mat4()))

			gl.UniformMatrix4fv(program.GetUniformLocation("world"), 1, false,
				&worldTransform[0])

			gl.DrawArrays(gl.TRIANGLES, 0, 36)
		}

		gl.BindVertexArray(0)

		texture0.UnBind()
		texture1.UnBind()

		// end of draw loop
	}

	return nil
}