func (r *RenderTarget) applyBlendMode(mode BlendMode) {
switch mode {
// glBlendFuncSeparateEXT is used when available to avoid an incorrect alpha value when the target
// is a RenderTexture -- in this case the alpha value must be written directly to the target buffer
// Alpha blending
default:
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
case BlendAlpha:
/*if (GLEW_EXT_blend_func_separate) {
glBlendFuncSeparateEXT(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA, gl.ONE, gl.ONE_MINUS_SRC_ALPHA)
} else {*/
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
//}
// Additive blending
case BlendAdd:
/*if GLEW_EXT_blend_func_separate {
gl.BlendFuncSeparateEXT(gl.SRC_ALPHA, gl.ONE, gl.ONE, gl.ONE)
} else {*/
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE)
//}
// Multiplicative blending
case BlendMultiply:
gl.BlendFunc(gl.DST_COLOR, gl.ZERO)
// No blending
case BlendNone:
gl.BlendFunc(gl.ONE, gl.ZERO)
}
r.lastBlendMode = mode
}
func (sg *OpenGLGraphics) Rect(x, y, w, h int, style chart.Style) {
// log.Panicf("Unimplemented: %s", whoami())
x, y, w, h = chart.SanitizeRect(x, y, w, h, style.LineWidth)
defer glh.OpenGLSentinel()()
//
glh.With(glh.Attrib{gl.ENABLE_BIT | gl.COLOR_BUFFER_BIT}, func() {
glh.ColorC(style.FillColor)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Begin(gl.QUADS)
glh.Squarei(x, y, w, h)
gl.End()
})
if style.LineWidth != 0 {
gl.LineWidth(float32(style.LineWidth))
//log.Print("Linewidth: ", float32(style.LineWidth))
glh.With(glh.Attrib{gl.ENABLE_BIT | gl.COLOR_BUFFER_BIT}, func() {
glh.ColorC(style.LineColor)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Begin(gl.LINE_LOOP)
glh.Squarei(x, y, w, h)
gl.End()
})
}
// linecol := style.LineColor
// if linecol != "" {
// s = fmt.Sprintf("stroke:%s; ", linecol)
// } else {
// linecol = "#808080"
// }
// s += fmt.Sprintf("stroke-width: %d; ", style.LineWidth)
// s += fmt.Sprintf("opacity: %.2f; ", 1-style.Alpha)
// if style.FillColor != "" {
// s += fmt.Sprintf("fill: %s; fill-opacity: %.2f", style.FillColor, 1-style.Alpha)
// } else {
// s += "fill-opacity: 0"
// }
// sg.svg.Rect(x, y, w, h, s)
// GenericRect(sg, x, y, w, h, style) // TODO
}
func main() {
if !glfw.Init() {
log.Fatal("glfw failed to initialize")
}
defer glfw.Terminate()
window, err := glfw.CreateWindow(640, 480, "Deformable", nil, nil)
if err != nil {
log.Fatal(err.Error())
}
window.MakeContextCurrent()
glfw.SwapInterval(1)
window.SetMouseButtonCallback(handleMouseButton)
window.SetKeyCallback(handleKeyDown)
window.SetInputMode(glfw.Cursor, glfw.CursorHidden)
gl.Init()
initGL()
i := 16
m = GenerateMap(1600/i, 1200/i, i)
for running && !window.ShouldClose() {
x, y := window.GetCursorPosition()
if drawing != 0 {
m.Add(int(x)+int(camera[0]), int(y)+int(camera[1]), drawing, brushSizes[currentBrushSize])
}
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.LoadIdentity()
gl.PushMatrix()
gl.PushAttrib(gl.CURRENT_BIT | gl.ENABLE_BIT | gl.LIGHTING_BIT | gl.POLYGON_BIT | gl.LINE_BIT)
gl.Translatef(-camera[0], -camera[1], 0)
m.Draw()
gl.PopAttrib()
gl.PopMatrix()
gl.PushAttrib(gl.COLOR_BUFFER_BIT)
gl.LineWidth(2)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.ONE_MINUS_DST_COLOR, gl.ZERO)
// gl.Enable(gl.LINE_SMOOTH)
// gl.Hint(gl.LINE_SMOOTH_HINT, gl.NICEST)
gl.Translatef(float32(x), float32(y), 0)
gl.EnableClientState(gl.VERTEX_ARRAY)
gl.VertexPointer(2, gl.DOUBLE, 0, cursorVerts)
gl.DrawArrays(gl.LINE_LOOP, 0, 24)
gl.PopAttrib()
window.SwapBuffers()
glfw.PollEvents()
}
}
func (m *Map) Draw() {
// gl.Enable(gl.PRIMITIVE_RESTART)
// gl.PrimitiveRestartIndex(PRIMITIVE_RESTART)
gl.EnableClientState(gl.VERTEX_ARRAY)
gl.Translatef(float32(m.gridSize/2), float32(m.gridSize/2), 0)
if m.renderSmooth {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.POLYGON_SMOOTH)
gl.Hint(gl.POLYGON_SMOOTH_HINT, gl.NICEST)
}
if m.renderMode == 1 {
gl.LineWidth(1)
gl.VertexPointer(2, gl.FLOAT, 0, m.gridLines)
gl.Color3f(0.2, 0.2, 0.2)
gl.DrawArrays(gl.LINES, 0, len(m.gridLines)/2)
gl.PolygonMode(gl.FRONT_AND_BACK, gl.LINE)
}
for _, vl := range m.vl {
if len(vl.vertices) > 0 {
gl.VertexPointer(2, gl.FLOAT, 0, vl.vertices)
gl.Color3f(vl.colors[0], vl.colors[1], vl.colors[2])
gl.DrawElements(gl.TRIANGLES, len(vl.indices), gl.UNSIGNED_INT, vl.indices)
}
}
}
func initGL() (err error) {
goph, err := os.Open(texturefiles[0])
if err != nil {
panic(err)
}
defer goph.Close()
texture, err = createTexture(goph)
gl.ShadeModel(gl.SMOOTH)
gl.ClearColor(0, 0, 0, 0.5)
gl.ClearDepth(1)
gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE) // 设置混色函数取得半透明效果
gl.Enable(gl.BLEND)
gl.Enable(gl.TEXTURE_2D)
rand.Seed(time.Now().Unix())
for loop = 0; loop < num; loop++ {
star[loop].angle = 0.0
star[loop].dist = float32(loop) / num * 5
//fmt.Println(loop, star[loop].dist)
star[loop].r = uint8(rand.Int() % 256)
star[loop].g = uint8(rand.Int() % 256)
star[loop].b = uint8(rand.Int() % 256)
}
return
}
func (pen *Pen) lineTo(x, y int) {
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.Color4f(0.0, 0.0, 0.0, 0.1)
gl.Begin(gl.LINES)
var p [2]int
for i := range pen.points {
p = pen.points[i]
if p[0] == 0 && p[1] == 0 {
continue
}
if distanceTo(x, y, p[0], p[1]) < 10.0 {
gl.Vertex2i(x, y)
gl.Vertex2i(p[0], p[1])
}
}
gl.End()
pen.n = (pen.n + 1) % len(pen.points)
pen.points[pen.n][0] = x
pen.points[pen.n][1] = y
pen.moveTo(x, y)
}
// Opens a new window.
func (c *Controller) Open(win *Window) (err error) {
c.Win = win
mode := glfw.Windowed
if win.Fullscreen {
mode = glfw.Fullscreen
}
if win.Resize == false {
glfw.OpenWindowHint(glfw.WindowNoResize, 1)
}
if err = glfw.OpenWindow(win.Width, win.Height, 0, 0, 0, 0, 0, 0, mode); err != nil {
return
}
gl.Init()
gl.Enable(gl.TEXTURE_2D)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
v1, v2, v3 := glfw.GLVersion()
log.Printf("OpenGL version: %v %v %v\n", v1, v2, v3)
fb_supported := glfw.ExtensionSupported("GL_EXT_framebuffer_object")
log.Printf("Framebuffer supported: %v\n", fb_supported)
c.SetClearColor(0, 0, 0, 0)
if win.VSync == true {
glfw.SetSwapInterval(1) // Limit to refresh
}
glfw.SetWindowTitle(win.Title)
glfw.SetWindowSizeCallback(func(w, h int) {
log.Printf("Resizing window to %v, %v\n", w, h)
c.resize()
})
err = c.resize()
return
}
func (sg *OpenGLGraphics) Line(x0, y0, x1, y1 int, style chart.Style) {
//log.Panicf("Unimplemented: %s", whoami())
defer glh.OpenGLSentinel()()
gl.LineWidth(float32(style.LineWidth))
// TODO: line stipple?
//sc := chart.Color2RGBA(style.LineColor, uint8(style.Alpha*255))
//log.Printf("color: %s %d %d %d %d", style.FillColor, sc.R, sc.G, sc.B, sc.A)
glh.ColorC(style.LineColor)
//sc := style.LineColor
//gl.Color4ub(sc.R, sc.G, sc.B, sc.A)
// TODO: Check this works
glh.With(glh.Attrib{gl.ENABLE_BIT | gl.COLOR_BUFFER_BIT}, func() {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
glh.With(glh.Primitive{gl.LINES}, func() {
gl.Vertex2i(x0, y0)
gl.Vertex2i(x1, y1)
})
})
}
// initGL initializes GLFW and OpenGL.
func initGL(c *cpu.CPU, width, height int) error {
err := glfw.Init()
if err != nil {
return err
}
glfw.OpenWindowHint(glfw.WindowNoResize, 1)
err = glfw.OpenWindow(width, height, 8, 8, 8, 8, 8, 0, glfw.Windowed)
if err != nil {
glfw.Terminate()
return err
}
glfw.SetWindowTitle("DCPU")
glfw.SetSwapInterval(1)
glfw.SetWindowSizeCallback(onResize)
gl.Init()
err = glh.CheckGLError()
if err != nil {
return err
}
gl.Disable(gl.LIGHTING)
gl.Disable(gl.DEPTH_TEST)
gl.Enable(gl.TEXTURE_2D)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.ClearColor(0, 0, 0, 1)
return err
}
func (s *System) draw() {
s.cmds <- func() {
gl.Enable(gl.DEPTH_TEST)
gl.Enable(gl.BLEND)
gl.DepthFunc(gl.LEQUAL)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
//s.shader.Use()
//s.shader.AssignUniforms(uniforms)
}
for _, _ = range s.meshes.layouts {
s.submit(renderState{})
}
for i := range s.buckets {
list := &s.buckets[i]
list.sort()
s.cmds <- list.execute
}
return
/*
s.cmds <- func() {
for _, geom := range geoms {
// gl state
// texture units
// uniforms
//shader.AssignUniforms()
shader.SetGeometry(&geom)
shader.Draw()
}
}
*/
}
func initGL() (err error) {
if err = loadTextures(); err != nil {
return
}
gl.ShadeModel(gl.SMOOTH)
gl.ClearColor(0, 0, 0, 0)
gl.ClearDepth(1)
gl.DepthFunc(gl.LEQUAL)
gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST)
gl.Enable(gl.TEXTURE_2D)
gl.Enable(gl.DEPTH_TEST)
//alpha通道的值为 0.0意味着物体材质是完全透明的。1.0 则意味着完全不透明
//以全亮度绘制此物体，并对其进行50%的alpha混合(半透明)。
//当混合选项打开时，此物体将会产生50%的透明效果
gl.Color4f(1, 1, 1, 0.5) //全亮度， 50% Alpha 混合
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE) //基于源象素alpha通道值的半透明混合函数
gl.Lightfv(gl.LIGHT1, gl.AMBIENT, ambient)
gl.Lightfv(gl.LIGHT1, gl.AMBIENT, diffuse)
gl.Lightfv(gl.LIGHT1, gl.POSITION, lightpos)
gl.Enable(gl.LIGHT1)
return
}
// initGL initializes GLFW and OpenGL.
func initGL() error {
err := glfw.Init()
if err != nil {
return err
}
err = glfw.OpenWindow(AtlasSize, AtlasSize, 8, 8, 8, 8, 0, 0, glfw.Windowed)
if err != nil {
glfw.Terminate()
return err
}
glfw.SetWindowTitle("Texture atlas example")
glfw.SetSwapInterval(1)
glfw.SetWindowSizeCallback(onResize)
glfw.SetKeyCallback(onKey)
gl.Init()
if err = glh.CheckGLError(); err != nil {
return err
}
gl.Disable(gl.DEPTH_TEST)
gl.Disable(gl.LIGHTING)
gl.Enable(gl.TEXTURE_2D)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.ClearColor(0.2, 0.2, 0.23, 1.0)
return nil
}
// OpenGL draw function
func draw() {
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()
gl.Begin(gl.LINES)
gl.Color3f(.2, .2, .2)
for i := range staticLines {
x := staticLines[i].GetAsSegment().A.X
y := staticLines[i].GetAsSegment().A.Y
gl.Vertex3f(float32(x), float32(y), 0)
x = staticLines[i].GetAsSegment().B.X
y = staticLines[i].GetAsSegment().B.Y
gl.Vertex3f(float32(x), float32(y), 0)
}
gl.End()
gl.Color4f(.3, .3, 1, .8)
// draw balls
for _, ball := range balls {
gl.PushMatrix()
pos := ball.Body.Position()
rot := ball.Body.Angle() * chipmunk.DegreeConst
gl.Translatef(float32(pos.X), float32(pos.Y), 0.0)
gl.Rotatef(float32(rot), 0, 0, 1)
drawCircle(float64(ballRadius), 60)
gl.PopMatrix()
}
}
// Binds the framebuffer for drawing.
func (fb *Framebuffer) Bind() {
fb.Buffer.Bind()
gl.Viewport(0, 0, fb.Width, fb.Height)
gl.Enable(gl.TEXTURE_2D)
gl.Disable(gl.DEPTH_TEST)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.BLEND)
}
func main() {
_ = fmt.Sprint()
if !glfw.Init() {
panic("Can't init glfw!")
}
defer glfw.Terminate()
// antialiasing
//glfw.WindowHint(glfw.Samples, 4)
window, err = glfw.CreateWindow(WindowWidth, WindowHeight, "Mozaik", nil, nil)
if err != nil {
panic(err)
}
defer window.Destroy()
// Ensure thread context
window.MakeContextCurrent()
//glfw.SwapInterval(1)
window.SetKeyCallback(keyCb)
window.SetMouseButtonCallback(mouseCb)
gl.Init()
gl.ClearColor(0.9, 0.85, 0.46, 0.0)
// useless in 2D
gl.Disable(gl.DEPTH_TEST)
// antialiasing
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.LINE_SMOOTH)
for i := int32(32); i < 72; i++ {
font := loadFonts(i)
defer font.Release()
fonts = append(fonts, font)
}
// Compute window radius
windowRadius = math.Sqrt(math.Pow(WindowHeight, 2) + math.Pow(WindowWidth, 2))
// Use window coordinates
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
gl.Ortho(0, WindowWidth, WindowHeight, 0, 0, 1)
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
g = NewGame()
g.Start()
go eventLoop(g)
go renderLoop(g)
Main()
g.Stop()
}
func handleText(camera *PerspectiveCamera, text *Text) {
// Material
material := text.Material()
program := material.Program()
if program == nil {
program = createTextProgram(text)
material.SetProgram(program)
}
program.Use()
defer program.Unuse()
if c, ok := material.(Colored); ok {
if c.Color() != nil {
program.uniforms["diffuse"].apply(c.Color())
}
}
if t, ok := material.(Textured); ok {
texture := t.Texture()
if texture != nil {
gl.ActiveTexture(gl.TEXTURE0)
texture.Bind()
defer texture.Unbind()
program.uniforms["texture"].apply(texture)
}
}
for _, attribute := range program.attributes {
attribute.enable()
defer attribute.disable()
attribute.bindBuffer()
defer attribute.unbindBuffer()
attribute.pointer()
attribute.bindBuffer()
}
vertexAttrib := gl.AttribLocation(0)
vertexAttrib.EnableArray()
defer vertexAttrib.DisableArray()
text.vertexBuffer.Bind(gl.ARRAY_BUFFER)
defer text.vertexBuffer.Unbind(gl.ARRAY_BUFFER)
vertexAttrib.AttribPointer(2, gl.FLOAT, false, 0, nil)
if t, ok := material.(Wireframed); ok {
if t.Wireframe() {
gl.PolygonMode(gl.FRONT_AND_BACK, gl.LINE)
} else {
gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
}
}
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.DrawArrays(gl.TRIANGLES, 0, len(text.Geometry().Vertices))
}
func (w *Window) renderInit() {
//bounds := w.body.Bounds()
gl.Disable(gl.MULTISAMPLE)
gl.Enable(gl.DEPTH_TEST)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.PolygonMode(gl.FRONT_AND_BACK, gl.FILL)
//gl.Viewport(0, 0, bounds.Max.X, bounds.Max.Y)
gl.ClearDepth(1)
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT | gl.STENCIL_BUFFER_BIT)
}
func drawHex(x, y, kind int, alpha float32) {
if kind == 6 {
gl.TexEnvf(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.REPLACE)
starTex.Bind(gl.TEXTURE_2D)
gl.Begin(gl.QUADS)
gl.TexCoord2f(0, 0)
gl.Vertex2i(x, y)
gl.TexCoord2f(0, 1)
gl.Vertex2i(x, y+HEX_HEIGHT)
gl.TexCoord2f(1, 1)
gl.Vertex2i(x+HEX_WIDTH, y+HEX_HEIGHT)
gl.TexCoord2f(1, 0)
gl.Vertex2i(x+HEX_WIDTH, y)
gl.End()
} else {
gl.TexEnvf(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.MODULATE)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
var r, g, b float32
switch kind {
case 0:
r = 1
case 1:
g = 1
case 2:
b = 1
case 3:
r = 1
g = 1
case 4:
r = 1
b = 1
case 5:
g = 1 - 222/255
b = 1
}
hexTex.Bind(gl.TEXTURE_2D)
gl.Begin(gl.QUADS)
if alpha < 1 {
gl.Color4f(r, g, b, alpha)
} else {
gl.Color3f(r, g, b)
}
gl.TexCoord2f(0, 0)
gl.Vertex2i(x, y)
gl.TexCoord2f(0, 1)
gl.Vertex2i(x, y+HEX_HEIGHT)
gl.TexCoord2f(1, 1)
gl.Vertex2i(x+HEX_WIDTH, y+HEX_HEIGHT)
gl.TexCoord2f(1, 0)
gl.Vertex2i(x+HEX_WIDTH, y)
gl.End()
}
}
func setupGL(w, h int) {
gl.Viewport(0, 0, w, h)
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
gl.Ortho(0, float64(w), float64(h), 0, 0, 1)
gl.ShadeModel(gl.SMOOTH)
gl.ClearColor(1, 1, 1, 0)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Disable(gl.DEPTH_TEST)
gl.Hint(gl.LINE_SMOOTH_HINT|gl.LINE_SMOOTH_HINT, gl.NICEST)
}
func (p *Path) glDraw(canv *Canvas) {
for e := p.Segs.Front(); e != nil; e = e.Next() {
e.Value.(PathSegment).Draw(canv)
}
if GetPt(p.endPoints.Back()).Mathgl().ApproxEqual(
GetPt(p.endPoints.Front()).Mathgl()) {
p.endPoints.Remove(p.endPoints.Back())
}
if p.endPoints.Len() < 3 {
return
}
gGl.Activate(gGl.TriangleDrawer)
gl.BlendFunc(gl.ONE_MINUS_DST_ALPHA, gl.ZERO)
defer gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
pa := make(p2t.PointArray, 0, p.endPoints.Len())
for e := p.endPoints.Front(); e != nil; e = e.Next() {
p := GetPt(e)
pa = append(pa, &p2t.Point{X: float64(p.X), Y: float64(p.Y)})
}
p2t.Init(pa)
triArr := p2t.Triangulate()
vertices := make([]float32, 6, 6)
for _, tri := range triArr {
for i, triPt := range tri.Point {
pt := canv.toGLPoint(Pt(triPt.X, triPt.Y))
vertices[i*2] = pt.X
vertices[i*2+1] = pt.Y
}
gl.BufferData(gl.ARRAY_BUFFER, len(vertices)*4, vertices, gl.STATIC_DRAW)
gl.DrawArrays(gl.TRIANGLES, 0, 3)
}
}
func initGL() (err error) {
gl.Init()
gl.ShadeModel(gl.SMOOTH)
gl.ClearColor(0, 0, 0, 0)
gl.ClearDepth(1)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST)
gl.DepthFunc(gl.NEVER)
gl.Enable(gl.BLEND)
gl.DepthMask(true)
//loadShader()
return
}
func OpenGLInit() *OpenGL {
g := &OpenGL{
QuadraticDrawer: newQuadraticDrawer(),
TriangleDrawer: newTriangleDrawer(),
FillDrawer: newFillDrawer(),
}
g.QuadraticDrawConfig = &QuadraticDrawConfig{glProgramInfo{g.QuadraticDrawer.program}, false}
g.QuadraticDrawer.AddConfig(g.QuadraticDrawConfig)
g.GlColorConfig = &GlColorConfig{glProgramInfo{g.QuadraticDrawer.program}, color.RGBA{0, 0, 0, 1}}
g.configs = append(g.configs, g.GlColorConfig)
g.GlColorConfig.SetColor(Black)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Enable(gl.BLEND)
gl.Enable(gl.STENCIL_TEST)
return g
}
func (h *Hex) Render(alpha float32, drawFromCenter bool) {
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
if h.Kind == HexFlower {
gl.TexEnvf(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.REPLACE)
starTex.Bind(gl.TEXTURE_2D)
} else {
gl.TexEnvf(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.MODULATE)
hexTex.Bind(gl.TEXTURE_2D)
gl.GetError()
var r, g, b uint8
r = uint8(colors.Colors[h.Kind-1][0])
g = uint8(colors.Colors[h.Kind-1][1])
b = uint8(colors.Colors[h.Kind-1][2])
if alpha < 1 {
gl.Color4ub(r, g, b, uint8(alpha*255))
} else {
gl.Color3ub(r, g, b)
}
}
gl.Begin(gl.QUADS)
gl.TexCoord2f(0, 0)
if drawFromCenter {
gl.Vertex2i(HEX_WIDTH/2, HEX_HEIGHT/2)
} else {
gl.Vertex2i(HEX_WIDTH, HEX_HEIGHT)
}
gl.TexCoord2f(0, 1)
if drawFromCenter {
gl.Vertex2i(HEX_WIDTH/2, -HEX_HEIGHT/2)
} else {
gl.Vertex2i(HEX_WIDTH, 0)
}
gl.TexCoord2f(1, 1)
if drawFromCenter {
gl.Vertex2i(-HEX_WIDTH/2, -HEX_HEIGHT/2)
} else {
gl.Vertex2i(0, 0)
}
gl.TexCoord2f(1, 0)
if drawFromCenter {
gl.Vertex2i(-HEX_WIDTH/2, HEX_HEIGHT/2)
} else {
gl.Vertex2i(0, HEX_HEIGHT)
}
gl.End()
}
func TexturedQuad(t *glh.Texture, x, y, w, h int) {
glh.With(t, func() {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Color4f(255.0, 255.0, 255.0, 1.0)
gl.Begin(gl.TRIANGLE_FAN)
gl.TexCoord2f(0, 0)
gl.Vertex2i(x, y)
gl.TexCoord2f(1, 0)
gl.Vertex2i(x+w, y)
gl.TexCoord2f(1, 1)
gl.Vertex2i(x+w, y+h)
gl.TexCoord2f(0, 1)
gl.Vertex2i(x, y+h)
gl.End()
})
}
func initGL() (err error) {
if err = loadTextures(); err != nil {
return
}
gl.ShadeModel(gl.SMOOTH)
gl.ClearColor(0, 0, 0, 0)
gl.ClearDepth(1)
gl.DepthFunc(gl.LEQUAL)
gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST)
gl.Enable(gl.TEXTURE_2D)
gl.Enable(gl.DEPTH_TEST)
gl.Color4f(1, 1, 1, 0.5)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE)
gl.Lightfv(gl.LIGHT1, gl.AMBIENT, ambient)
gl.Lightfv(gl.LIGHT1, gl.AMBIENT, diffuse)
gl.Lightfv(gl.LIGHT1, gl.POSITION, lightpos)
gl.Enable(gl.LIGHT1)
return
}
func initGL() (err error) {
goph, err := os.Open(texturefiles)
if err != nil {
panic(err)
}
defer goph.Close()
texture, err = createTexture(goph)
gl.Enable(gl.TEXTURE_2D)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE) // 设置混色函数取得半透明效果
gl.ClearColor(0, 0, 0, 0.0)
gl.ClearDepth(1)
gl.DepthFunc(gl.LESS)
gl.Enable(gl.DEPTH_TEST)
gl.ShadeModel(gl.SMOOTH)
gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST)
SetupWorld()
return
}
func Init() {
//gl.Enable(gl.DEPTH_TEST)
var tmpmaxa []float32 = []float32{0}
gl.GetFloatv(GL_MAX_TEXTURE_MAX_ANISOTROPY_EXT, tmpmaxa)
MaxAnisotropy = tmpmaxa[0]
log.Print("MaxAnisotropy: ", MaxAnisotropy)
// Anti-aliasing
gl.Enable(gl.LINE_SMOOTH)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
//gl.BlendFunc(gl.SRC_ALPHA, gl.DST_ALPHA)
//gl.BlendFunc(gl.SRC_ALPHA_SATURATE, gl.ONE)
gl.Hint(gl.LINE_SMOOTH_HINT, gl.NICEST)
gl.Hint(gl.GENERATE_MIPMAP_HINT, gl.NICEST)
extensions := gl.GetString(gl.EXTENSIONS)
if !strings.Contains(extensions, "GL_ARB_framebuffer_object") {
log.Panic("No FBO support :-(")
}
}
// Draw `text` at `x`, `y`.
func (text *Text) Draw(x, y int) {
var w, h = text.W, text.H
if text.Flipped {
h = -h
}
With(Attrib{gl.ENABLE_BIT | gl.COLOR_BUFFER_BIT}, func() {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.DST_ALPHA)
//gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
With(text, func() {
gl.TexEnvi(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.MODULATE)
DrawQuadi(x, y, w, h)
})
})
if text.DebugRect {
gl.LineWidth(1)
With(Primitive{gl.LINE_LOOP}, func() {
sp := 0
Squarei(x-sp, y+sp, w+sp*2, h-sp*2)
})
}
}
func drawBorderAtXY(x, y float32, reverse int) {
if x <= 80 || y <= 80 {
return
}
gl.PushMatrix()
gl.Translatef(x, y, 0)
if reverse == 1 {
gl.Rotatef(60, 0, 0, 1)
}
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.TexEnvf(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.REPLACE)
borderTex.Bind(gl.TEXTURE_2D)
gl.Begin(gl.QUADS)
gl.TexCoord2f(0, 0)
gl.Vertex2i(-38, -38)
gl.TexCoord2f(0, 1)
gl.Vertex2i(-38, 38)
gl.TexCoord2f(1, 1)
gl.Vertex2i(38, 38)
gl.TexCoord2f(1, 0)
gl.Vertex2i(38, -38)
gl.End()
gl.PopMatrix()
}
func (sg *OpenGLGraphics) Scatter(points []chart.EPoint, plotstyle chart.PlotStyle, style chart.Style) {
//log.Panicf("Unimplemented: %s", whoami())
//chart.GenericScatter(sg, points, plotstyle, style)
// TODO: Implement error bars/symbols
buffer := glh.NewMeshBuffer(glh.RenderArrays,
glh.NewPositionAttr(2, gl.DOUBLE, gl.STATIC_DRAW),
glh.NewColorAttr(3, gl.UNSIGNED_INT, gl.STATIC_DRAW))
// var vertices glh.ColorVertices
positions := make([]float64, len(points)*2)
colors := make([]uint32, len(points)*3)
for _, p := range points {
r, g, b, _ := style.LineColor.RGBA()
colors = append(colors, r, g, b)
positions = append(positions, p.X, p.Y)
// vertices.Add(glh.ColorVertex{
// glh.MkRGBA(style.LineColor),
// glh.Vertex{float32(p.X), float32(p.Y)}})
}
buffer.Add()
if style.LineWidth != 0 {
gl.LineWidth(float32(style.LineWidth))
} else {
gl.LineWidth(1)
}
glh.With(glh.Attrib{gl.ENABLE_BIT | gl.COLOR_BUFFER_BIT}, func() {
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
buffer.Render(gl.LINE_STRIP)
})
/***********************************************
// First pass: Error bars
ebs := style
ebs.LineColor, ebs.LineWidth, ebs.LineStyle = ebs.FillColor, 1, chart.SolidLine
if ebs.LineColor == "" {
ebs.LineColor = "#404040"
}
if ebs.LineWidth == 0 {
ebs.LineWidth = 1
}
for _, p := range points {
xl, yl, xh, yh := p.BoundingBox()
// fmt.Printf("Draw %d: %f %f-%f\n", i, p.DeltaX, xl,xh)
if !math.IsNaN(p.DeltaX) {
sg.Line(int(xl), int(p.Y), int(xh), int(p.Y), ebs)
}
if !math.IsNaN(p.DeltaY) {
sg.Line(int(p.X), int(yl), int(p.X), int(yh), ebs)
}
}
// Second pass: Line
if (plotstyle&chart.PlotStyleLines) != 0 && len(points) > 0 {
path := fmt.Sprintf("M %d,%d", int(points[0].X), int(points[0].Y))
for i := 1; i < len(points); i++ {
path += fmt.Sprintf("L %d,%d", int(points[i].X), int(points[i].Y))
}
st := linestyle(style)
sg.svg.Path(path, st)
}
// Third pass: symbols
if (plotstyle&chart.PlotStylePoints) != 0 && len(points) != 0 {
for _, p := range points {
sg.Symbol(int(p.X), int(p.Y), style)
}
}
****************************************************/
}