Exemple #1
0
func display() {
	// Clear the background as white
	gl.ClearColor(1.0, 1.0, 1.0, 1.0)
	gl.Clear(gl.COLOR_BUFFER_BIT)

	// Use the GLSL program
	gl.UseProgram(program)

	gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
	gl.EnableVertexAttribArray(attributeCoord2d)

	// Describe our vertices array to OpenGL (it can't guess its format automatically)
	gl.VertexAttribPointer(attributeCoord2d, 2, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))

	gl.EnableVertexAttribArray(attributeColor)
	gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangleColors)
	gl.VertexAttribPointer(attributeColor, 3, gl.FLOAT, gl.FALSE, 0, gl.Pointer(nil))

	// Push each element in buffer_vertices to the vertex shader
	gl.DrawArrays(gl.TRIANGLES, 0, 3)

	gl.DisableVertexAttribArray(attributeCoord2d)
	gl.DisableVertexAttribArray(attributeColor)
	gl.BindBuffer(gl.ARRAY_BUFFER, 0) // Unbind

	// Display the result
	glfw.SwapBuffers()
}
Exemple #2
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func initResources() {
	var err error
	// Load shaders
	vs, err = createShader("triangle.v.glsl", VertexShaderType)
	if err != nil {
		fmt.Printf("Shader: %s\n", err)
		return
	}
	fs, err = createShader("triangle.f.glsl", FragmentShaderType)
	if err != nil {
		fmt.Printf("Shader: %s\n", err)
		return
	}

	// Create GLSL program with loaded shaders
	var compileOk gl.Int
	program = gl.CreateProgram()
	gl.AttachShader(program, vs)
	gl.AttachShader(program, fs)
	gl.LinkProgram(program)
	gl.GetProgramiv(program, gl.LINK_STATUS, &compileOk)
	if compileOk == 0 {
		fmt.Printf("Error in program.\n")
	}

	// Generate a buffer for the VertexBufferObject
	gl.GenBuffers(1, &vboTriangle)
	gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangle)
	// Submit the vertices of the triangle to the graphic card
	gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangleVertices)*4), gl.Pointer(&triangleVertices[0]), gl.STATIC_DRAW)
	// Unset the active buffer
	gl.BindBuffer(gl.ARRAY_BUFFER, 0)

	// Generate a buffer for the Color-VBO
	gl.GenBuffers(1, &vboTriangleColors)
	gl.BindBuffer(gl.ARRAY_BUFFER, vboTriangleColors)
	gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangleColors)*4), gl.Pointer(&triangleColors[0]), gl.STATIC_DRAW)
	gl.BindBuffer(gl.ARRAY_BUFFER, 0)

	// Get the attribute location from the GLSL program (here from the vertex shader)
	attributeName := gl.GLString("coord2d")
	defer gl.GLStringFree(attributeName)
	attributeTemp := gl.GetAttribLocation(program, attributeName)
	if attributeTemp == -1 {
		fmt.Printf("Could not bind attribute %s\n", gl.GoString(attributeName))
	}
	attributeCoord2d = gl.Uint(attributeTemp)

	attributeName = gl.GLString("v_color")
	defer gl.GLStringFree(attributeName)
	attributeTemp = gl.GetAttribLocation(program, attributeName)
	if attributeTemp == -1 {
		fmt.Printf("Could not bind attribute %s\n", gl.GoString(attributeName))
	}
	attributeColor = gl.Uint(attributeTemp)
}
func drawPrimitives(color color.Color, mode gl.Enum, vecs ...geometry.Vector2) {
	vertices := make([]float32, len(vecs)*2)
	r, g, b, a := glcolor.ConvertColorF(color)
	var colors []float32
	for i := range vecs {
		vertices[i*2] = vecs[i].X
		vertices[i*2+1] = vecs[i].Y
		colors = append(colors, r, g, b, a)
	}
	DefaultPrimitivesShaderProgram.Use()
	primitivesUniformMatrix.UniformMatrix4fv(1, false, DefaultCamera.Transposed())
	primitivesAttributeCoord.Enable()
	primitivesAttributeCoord.AttribPointer(2, gl.FLOAT, false, 0, gl.Pointer(&vertices[0]))

	primitivesAttributeColor.Enable()
	primitivesAttributeColor.AttribPointer(4, gl.FLOAT, false, 0, gl.Pointer(&colors[0]))

	gl.DrawArrays(mode, 0, gl.Sizei(len(vecs)))

	primitivesAttributeColor.Disable()
	primitivesAttributeCoord.Disable()
}
Exemple #4
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func (buffer *Buffer) Update() {
	buffer.Bind()
	data := gl33.Pointer(buffer.Value.Pointer())
	size := gl33.Sizeiptr(buffer.Value.Len() * int(buffer.Value.Type().Elem().Size()))
	gl33.BufferData(buffer.Target, size, data, buffer.Type)
}
Exemple #5
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func (vbo *VertexBufferObject) BufferData(data []float32) {
	gl.BindBuffer(gl.ARRAY_BUFFER, vbo.id)
	gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(data)*4), gl.Pointer(&data[0]), gl.STATIC_DRAW)
	gl.BindBuffer(gl.ARRAY_BUFFER, 0)
}
Exemple #6
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func main() {
	var window *sdl.Window
	var context sdl.GLContext
	var event sdl.Event
	var running bool
	var err error
	runtime.LockOSThread()
	if err = sdl.Init(sdl.INIT_EVERYTHING); err != nil {
		panic(err)
	}
	defer sdl.Quit()
	window, err = sdl.CreateWindow(winTitle, sdl.WINDOWPOS_UNDEFINED,
		sdl.WINDOWPOS_UNDEFINED,
		winWidth, winHeight, sdl.WINDOW_OPENGL)
	if err != nil {
		panic(err)
	}
	defer window.Destroy()
	context, err = sdl.GL_CreateContext(window)
	if err != nil {
		panic(err)
	}
	defer sdl.GL_DeleteContext(context)

	gl.Init()
	gl.Viewport(0, 0, gl.Sizei(winWidth), gl.Sizei(winHeight))
	// OPENGL FLAGS
	gl.ClearColor(0.0, 0.1, 0.0, 1.0)
	gl.Enable(gl.DEPTH_TEST)
	gl.DepthFunc(gl.LESS)
	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)

	// VERTEX BUFFER
	var vertexbuffer gl.Uint
	gl.GenBuffers(1, &vertexbuffer)
	gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
	gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_vertices)*4), gl.Pointer(&triangle_vertices[0]), gl.STATIC_DRAW)

	// COLOUR BUFFER
	var colourbuffer gl.Uint
	gl.GenBuffers(1, &colourbuffer)
	gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
	gl.BufferData(gl.ARRAY_BUFFER, gl.Sizeiptr(len(triangle_colours)*4), gl.Pointer(&triangle_colours[0]), gl.STATIC_DRAW)

	// GUESS WHAT
	program := createprogram()

	// VERTEX ARRAY
	var VertexArrayID gl.Uint
	gl.GenVertexArrays(1, &VertexArrayID)
	gl.BindVertexArray(VertexArrayID)
	gl.EnableVertexAttribArray(0)
	gl.BindBuffer(gl.ARRAY_BUFFER, vertexbuffer)
	gl.VertexAttribPointer(0, 3, gl.FLOAT, gl.FALSE, 0, nil)

	// VERTEX ARRAY HOOK COLOURS
	gl.EnableVertexAttribArray(1)
	gl.BindBuffer(gl.ARRAY_BUFFER, colourbuffer)
	gl.VertexAttribPointer(1, 3, gl.FLOAT, gl.FALSE, 0, nil)

	//UNIFORM HOOK
	unistring := gl.GLString("scaleMove")
	UniScale = gl.GetUniformLocation(program, unistring)
	fmt.Printf("Uniform Link: %v\n", UniScale+1)

	gl.UseProgram(program)

	running = true
	for running {
		for event = sdl.PollEvent(); event != nil; event =
			sdl.PollEvent() {
			switch t := event.(type) {
			case *sdl.QuitEvent:
				running = false
			case *sdl.MouseMotionEvent:

				xrot = float32(t.Y) / 2
				yrot = float32(t.X) / 2
				fmt.Printf("[%dms]MouseMotion\tid:%d\tx:%d\ty:%d\txrel:%d\tyrel:%d\n", t.Timestamp, t.Which, t.X, t.Y, t.XRel, t.YRel)
			}
		}
		drawgl()
		sdl.GL_SwapWindow(window)
	}
}
Exemple #7
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func LoadTextureArray(filenames []string, minFilter int, magFilter int) *Texture {
	ch := make(chan *Texture)
	GL <- func() {
		tex := NewTextureArray()
		tex.SetFilters(minFilter, magFilter)
		tex.Bind(0)
		surfaces := make([]*sdl.Surface, len(filenames))
		for i, filename := range filenames {
			surfaces[i] = sdl.Load(filename)
			if surfaces[i] == nil {
				panic(sdl.GetError())
			}
			defer surfaces[i].Free()
		}
		tex.Width = int(surfaces[0].W)
		tex.Height = int(surfaces[0].H)
		var internalFormat gl33.Int
		var format gl33.Enum
		var size int
		if surfaces[0].Format.BitsPerPixel == 32 {
			internalFormat = gl33.RGBA8
			format = gl33.RGBA
			size = 4
		} else {
			internalFormat = gl33.RGB8
			format = gl33.RGB
			size = 3
		}
		pixels := make([]byte, tex.Width*tex.Height*len(surfaces)*size)
		for i, surface := range surfaces {
			p := uintptr(surface.Pixels)
			for j := 0; j < tex.Width*tex.Height*size; j++ {
				pixels[i*tex.Width*tex.Height*size+j] = *(*byte)(unsafe.Pointer(p + uintptr(j)))
			}
		}
		gl33.TexImage3D(gl33.TEXTURE_2D_ARRAY, 0, internalFormat, gl33.Sizei(tex.Width), gl33.Sizei(tex.Height), gl33.Sizei(len(surfaces)), 0, format, gl33.UNSIGNED_BYTE, gl33.Pointer(&pixels[0]))
		gl33.GenerateMipmap(gl33.TEXTURE_2D_ARRAY)
		ch <- tex
	}
	return <-ch
}
Exemple #8
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func uploadSurface(target gl33.Enum, surface *sdl.Surface) {
	if target == gl33.TEXTURE_CUBE_MAP && surface.W != surface.H {
		panic("Non-square texture in cube map")
	}
	var internalFormat gl33.Int
	var format gl33.Enum
	if surface.Format.BitsPerPixel == 32 {
		internalFormat = gl33.RGBA8
		format = gl33.RGBA
	} else {
		internalFormat = gl33.RGB8
		format = gl33.RGB
	}
	gl33.TexImage2D(target, 0, internalFormat, gl33.Sizei(surface.W), gl33.Sizei(surface.H), 0, format, gl33.UNSIGNED_BYTE, gl33.Pointer(surface.Pixels))
}
Exemple #9
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func setupAttrib(location gl33.Uint, type_ gl33.Enum, dimensions int, offset uintptr, vertexSize int) {
	gl33.EnableVertexAttribArray(location)
	if type_ == gl33.FLOAT || type_ == gl33.DOUBLE {
		gl33.VertexAttribPointer(location, gl33.Int(dimensions), type_, gl33.FALSE, gl33.Sizei(vertexSize), gl33.Pointer(offset))
	} else {
		gl33.VertexAttribIPointer(location, gl33.Int(dimensions), type_, gl33.Sizei(vertexSize), gl33.Pointer(offset))
	}
}
Exemple #10
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func (mesh *Mesh) Render() {
	gl33.BindVertexArray(mesh.vao)
	gl33.DrawElements(gl33.TRIANGLES, gl33.Sizei(len(mesh.Indicies)), gl33.UNSIGNED_INT, gl33.Pointer(uintptr(0)))
}
Exemple #11
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// LoadTexture buffers an image.Image into the graphic cards memory.
func LoadTexture(img image.Image) (*Texture, error) {
	w := img.Bounds().Dx()
	h := img.Bounds().Dy()
	rgba := image.NewRGBA(image.Rect(0, 0, w, h))
	for x := 0; x < w; x++ {
		for y := 0; y < h; y++ {
			rgba.Set(x, y, img.At(x, y))
		}
	}
	var textureId gl.Uint
	//gl.ActiveTexture(gl.TEXTURE0)
	gl.GenTextures(1, &textureId)
	gl.BindTexture(gl.TEXTURE_2D, textureId)
	//gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
	gl.TexParameterf(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)

	gl.TexImage2D(gl.TEXTURE_2D, 0, 4, gl.Sizei(rgba.Rect.Dx()), gl.Sizei(rgba.Rect.Dy()), 0, gl.RGBA, gl.UNSIGNED_BYTE, gl.Pointer(&rgba.Pix[0]))

	gl.BindTexture(gl.TEXTURE_2D, 0)
	return &Texture{id: textureId}, nil
}