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
}
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)
}
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
}
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)
}
}
// 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)
}
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
}
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
}
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
}
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
}