Exemplo n.º 1
0
// New creates a new shader object. The shader can later be activated by the given name with the Use function
func New(name, vertexShaderSource, fragmentShaderSource string) error {
	if _, found := shaderList[name]; found {
		return fmt.Errorf("Shader already exists: %v", name)
	}
	program, err := newProgram(vertexShaderSource, fragmentShaderSource)
	if err != nil {
		return err
	}
	shader := Shader{}
	shader.id = program
	shader.loaded = true
	shader.vert = vertexShaderSource
	shader.frag = fragmentShaderSource

	gl.UseProgram(shader.id)

	shader.Projection = gl.GetUniformLocation(program, gl.Str("projection\x00"))
	shader.Camera = gl.GetUniformLocation(program, gl.Str("camera\x00"))
	shader.Model = gl.GetUniformLocation(program, gl.Str("model\x00"))

	shaderList[name] = shader

	if activeShader := GetActive(); activeShader != nil {
		activeShader.Activate()
	}
	return nil
}
Exemplo n.º 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)
}
Exemplo n.º 3
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)
		}
	}
}
Exemplo n.º 4
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])

}
Exemplo n.º 5
0
// Activate will draw everything with this program and load it if it isnt loaded.
func (shader *Shader) Activate() {
	if !shader.loaded {
		program, err := newProgram(shader.vert, shader.frag)
		if err != nil {
			panic(err)
		}
		shader.id = program
		shader.loaded = true

		gl.UseProgram(shader.id)

		shader.Projection = gl.GetUniformLocation(program, gl.Str("projection\x00"))
		shader.Camera = gl.GetUniformLocation(program, gl.Str("camera\x00"))
		shader.Model = gl.GetUniformLocation(program, gl.Str("model\x00"))

	}
	state.shader = shader
	gl.UseProgram(shader.id)
}
Exemplo n.º 6
0
func (p *Program) GetUniformLocation(s string) int32 {
	var res int32
	var ok bool
	if res, ok = p.uniforms[s]; ok {
		return res
	}

	var s_array []uint8 = StringToArray(s)
	res = gl.GetUniformLocation(p.prog, &s_array[0])
	p.uniforms[s] = res
	return res
}
Exemplo n.º 7
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()
	}
}
Exemplo n.º 8
0
func (prog *Program) GetUniformLocation(name string) int32 {
	return gl.GetUniformLocation(prog.handle, gl.Str(name+"\x00"))
}
Exemplo n.º 9
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()
	}
}