// 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()
}
}
func drawSlide() {
gl.Clear(gl.COLOR_BUFFER_BIT)
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
gl.Translatef(0, 0, -3.0)
gl.Begin(gl.QUADS)
//top left
gl.TexCoord2f(0, 0)
gl.Vertex3f(-1, 1, 0)
//top right
gl.TexCoord2f(1, 0)
gl.Vertex3f(1, 1, 0)
//bottom right
gl.TexCoord2f(1, 1)
gl.Vertex3f(1, -1, 0)
//bottom left
gl.TexCoord2f(0, 1)
gl.Vertex3f(-1, -1, 0)
gl.End()
}
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()
//Transform screen to keep player in middle. Added intentation to make obvious the push matrix is like a block
gl.PushMatrix()
// gl.Translatef((1280/2)-float32(player.x), 0, 0.0)
// gl.Begin(gl.LINES)
// gl.Color3f(.2, .5, .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(player.color_r, player.color_g, player.color_b, player.color_a)
//Draw Player
gl.PushMatrix()
rot := player.rot
pos_x := player.x
pos_y := player.y
gl.Translatef(pos_x, pos_y, 0.0)
gl.Rotatef(float32(rot), 0, 0, 1)
drawCircle(float64(BALL_RADIUS), 20)
gl.PopMatrix()
//Draw the grapple
gl.PushMatrix()
gl.Translatef(player.hook.x_end, player.hook.y_end, 0.0)
drawCircle(float64(5), 5)
gl.PopMatrix()
//Grapple Line
gl.LineWidth(2.5)
gl.Color3f(1.0, 0.0, 0.0)
gl.Begin(gl.LINES)
gl.Vertex3f(player.x, player.y, 0.0)
gl.Vertex3f(player.hook.x_end, player.hook.y_end, 0)
gl.End()
//Second Pop
gl.PopMatrix()
}
func (e *Element) Render() {
gl.Color4f(e.color.R, e.color.G, e.color.B, e.color.A)
gl.Begin(gl.QUADS)
gl.Vertex3f(e.x, e.y, 0)
gl.Vertex3f(e.x, e.y+e.height, 0)
gl.Vertex3f(e.x+e.width, e.y+e.height, 0)
gl.Vertex3f(e.x+e.width, e.y, 0)
gl.End()
}
func (ctx *DrawContext) drawGrid() {
gl.Disable(gl.DEPTH_TEST)
defer gl.Enable(gl.DEPTH_TEST)
for i := float32(-500); i <= 500; i += 5 {
gl.Begin(gl.LINES)
gl.Color3f(0.2, 0.2, 0.2)
gl.Vertex3f(-500, i, 0)
gl.Vertex3f(500, i, 0)
gl.Vertex3f(i, -500, 0)
gl.Vertex3f(i, 500, 0)
gl.End()
}
}
// 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()
player := game.Player
//Transform screen.
gl.PushMatrix()
gl.Translatef((1280/2)-float32((player.Body.Position().X)), 0, 0.0)
gl.Begin(gl.LINES)
gl.Color3f(.2, .5, .2)
for _, segment := range game.Level.GetChipmunkSegments() {
x := segment.GetAsSegment().A.X
y := segment.GetAsSegment().A.Y
gl.Vertex3f(float32(x), float32(y), 0)
x = segment.GetAsSegment().B.X
y = segment.GetAsSegment().B.Y
gl.Vertex3f(float32(x), float32(y), 0)
}
gl.End()
gl.Color4f(.9, .1, 1, .9)
// draw balls
for _, enemy := range game.Enemies {
gl.PushMatrix()
pos := enemy.Body.Position()
rot := enemy.Body.Angle() * game.DegreeConst
gl.Translatef(float32(pos.X), float32(pos.Y), 0.0)
gl.Rotatef(float32(rot), 0, 0, 1)
drawCircle(float64(enemy.Radius), 60)
gl.PopMatrix()
}
gl.Color4f(.3, .3, 1, .8)
//Draw Player
gl.PushMatrix()
pos := player.Body.Position()
rot := player.Body.Angle() * game.DegreeConst
gl.Translatef(float32(pos.X), float32(pos.Y), 0.0)
gl.Rotatef(float32(rot), 0, 0, 1)
drawCircle(float64(player.Radius), 60)
gl.PopMatrix()
gl.PopMatrix()
}
func drawScene(w *glfw.Window) {
width, height := w.GetFramebufferSize()
ratio := float32(width) / float32(height)
var x1, x2, y1, y2 float32
if ratio > 1 {
x1, x2, y1, y2 = -ratio, ratio, -1, 1
} else {
x1, x2, y1, y2 = -1, 1, -1/ratio, 1/ratio
}
gl.Viewport(0, 0, int32(width), int32(height))
gl.Clear(gl.COLOR_BUFFER_BIT)
// Applies subsequent matrix operations to the projection matrix stack
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity() // replace the current matrix with the identity matrix
gl.Ortho(float64(x1), float64(x2), float64(y1), float64(y2), 1, -1) // multiply the current matrix with an orthographic matrix
// Applies subsequent matrix operations to the modelview matrix stack
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
gl.LineWidth(1)
gl.Begin(gl.LINE) // delimit the vertices of a primitive or a group of like primitives
gl.Color3f(0, 0, 0) // set the current color
gl.Vertex3f(0, y1, 0)
gl.Vertex3f(0, y2, 0)
gl.Vertex3f(x1, 0, 0)
gl.Vertex3f(x2, 0, 0)
gl.End()
gl.Rotatef(float32(glfw.GetTime()*50), 0, 0, 1) // multiply the current matrix by a rotation matrix
s := float32(.95)
gl.Begin(gl.TRIANGLES)
gl.Color3f(1, 0, 0) // set the current color
gl.Vertex3f(0, s, 0) // specify a vertex
gl.Color3f(0, 1, 0)
gl.Vertex3f(s*.866, s*-0.5, 0)
gl.Color3f(0, 0, 1)
gl.Vertex3f(s*-.866, s*-0.5, 0)
gl.End()
gl.LineWidth(5)
gl.Begin(gl.LINE_LOOP)
for i := float64(0); i < 2*math.Pi; i += .05 {
r, g, b := hsb2rgb(float32(i/(2*math.Pi)), 1, 1)
gl.Color3f(r, g, b)
gl.Vertex3f(s*float32(math.Sin(i)), s*float32(math.Cos(i)), 0)
}
gl.End()
}
func (o openGLCanvas) FillRect(what color.Color, where image.Rectangle) {
return //this does not work at all... makes the whole image red
drawX := float32(where.Min.X) * o.scaleX
drawY := float32(where.Min.Y) * o.scaleY
endX := float32(where.Max.X) * o.scaleX
endY := float32(where.Max.Y) * o.scaleY
r, g, b, a := what.RGBA()
gl.Color4f(float32(r)/0xFF, float32(g)/0xFF, float32(b)/0xFF, float32(a)/0xFF)
gl.Begin(gl.QUADS)
{
gl.Vertex3f(drawX, drawY, 0)
gl.Vertex3f(drawX, endX, 0)
gl.Vertex3f(endX, endY, 0)
gl.Vertex3f(endX, drawY, 0)
}
gl.End()
}
// drawCircle draws a circle for the specified radius, rotation angle, and the specified number of sides
func drawCircle(radius float64, sides int) {
gl.Begin(gl.LINE_LOOP)
for a := 0.0; a < 2*math.Pi; a += (2 * math.Pi / float64(sides)) {
gl.Vertex2d(math.Sin(a)*radius, math.Cos(a)*radius)
}
gl.Vertex3f(0, 0, 0)
gl.End()
}
// drawCircle draws a circle for the specified radius, rotation angle, and the specified number of sides
func drawCircle(radius float64, sides int) {
gl.Begin(gl.TRIANGLE_FAN)
for a := 0.0; a < 2*math.Pi; a += (2 * math.Pi / float64(70)) {
gl.Vertex2d(math.Sin(a)*radius, math.Cos(a)*radius)
}
gl.Vertex3f(0, 0, 0)
gl.End()
}
func (o *openGLCanvas) Draw(tile image.Rectangle, where image.Rectangle, f tmx.FlipMode, tileset string) {
if _, ok := o.sets[tileset]; !ok {
o.sets[tileset] = newChipset(tileset, tile.Max.X-tile.Min.X)
}
c := o.sets[tileset]
gl.BindTexture(gl.TEXTURE_2D, c.handle)
// Texture coords
fts := float32(c.tilesize)
tileWidthPixels := fts / float32(c.width)
tileHeightPixels := fts / float32(c.height)
startX := (float32(tile.Min.X) / fts) * tileWidthPixels
startY := (float32(tile.Min.Y) / fts) * tileHeightPixels
endX := startX + tileWidthPixels
endY := startY + tileHeightPixels
// Draw coords
drawX := float32(where.Min.X)
drawY := float32(where.Min.Y)
gl.Begin(gl.QUADS)
{
gl.TexCoord2f(startX, startY)
gl.Vertex3f(drawX*o.scaleX, drawY*o.scaleY, 0)
gl.TexCoord2f(startX, endY)
gl.Vertex3f(drawX*o.scaleX, (drawY+fts)*o.scaleY, 0)
gl.TexCoord2f(endX, endY)
gl.Vertex3f((drawX+fts)*o.scaleX, (drawY+fts)*o.scaleY, 0)
gl.TexCoord2f(endX, startY)
gl.Vertex3f((drawX+fts)*o.scaleX, (drawY)*o.scaleY, 0)
}
gl.End()
}
func renderTile(id int, x, y float32) {
var tx, ty, w, h float32 = 0, 0, 0.0625, 0.0625
tilex := id % 16
tiley := (id - tilex) / 16
tx = float32(tilex)
ty = float32(tiley)
gl.TexCoord2f(tx/16.0, ty/16.0+h)
gl.Vertex3f(x, y, 0)
gl.TexCoord2f(tx/16.0, ty/16.0)
gl.Vertex3f(x, y+1, 0)
gl.TexCoord2f(tx/16.0+w, ty/16.0+h)
gl.Vertex3f(x+1, y, 0)
gl.TexCoord2f(tx/16.0+w, ty/16.0)
gl.Vertex3f(x+1, y+1, 0)
gl.TexCoord2f(tx/16.0+w, ty/16.0+h)
gl.Vertex3f(x+1, y, 0)
gl.TexCoord2f(tx/16.0, ty/16.0)
gl.Vertex3f(x, y+1, 0)
}
// creates the box vector
func box(h float32, w float32, d float32) {
gl.ShadeModel(gl.SMOOTH)
gl.Normal3d(1.0, 1.0, 1.0)
//red := [...]float32{0.8, 0.1, 0.0, 1.0}
//green := [...]float32{0.0, 0.8, 0.2, 1.0}
//blue := [...]float32{0.2, 0.2, 1.0, 1.0}
var red float32 = 1.0
var green float32 = 1.0
var blue float32 = 1.0
gl.Materialfv(gl.FRONT, gl.AMBIENT_AND_DIFFUSE, &red)
var delta float32 = 0
// left wall
gl.Begin(gl.POLYGON)
gl.Color3f(1.0, 0.0, 0.0)
gl.Vertex3f(delta, delta, delta)
gl.Vertex3f(delta, h, delta)
gl.Vertex3f(w, h, delta)
gl.Vertex3f(w, delta, delta)
gl.End()
//right wall
gl.Begin(gl.POLYGON)
gl.Color3f(0.0, 0.0, 1.0)
gl.Vertex3f(delta, delta, d)
gl.Vertex3f(delta, h, d)
gl.Vertex3f(w, h, d)
gl.Vertex3f(w, delta, d)
gl.End()
gl.Materialfv(gl.FRONT, gl.AMBIENT_AND_DIFFUSE, &blue)
//top wall
gl.Begin(gl.POLYGON)
gl.Color3f(0.0, 1.0, 0.0)
gl.Vertex3f(delta, delta, d)
gl.Vertex3f(w, delta, d)
gl.Vertex3f(w, delta, delta)
gl.Vertex3f(delta, delta, delta)
gl.End()
//bottom wall
gl.Begin(gl.POLYGON)
gl.Color3f(0.5, 0.5, 0.0)
gl.Vertex3f(delta, h, d)
gl.Vertex3f(w, h, d)
gl.Vertex3f(w, h, delta)
gl.Vertex3f(delta, h, delta)
gl.End()
gl.Materialfv(gl.FRONT, gl.AMBIENT_AND_DIFFUSE, &green)
//forward wall
gl.Begin(gl.POLYGON)
gl.Color3f(0.0, 0.0, 1.0)
gl.Vertex3f(delta, delta, delta)
gl.Vertex3f(delta, delta, d)
gl.Vertex3f(delta, h, d)
gl.Vertex3f(delta, h, delta)
gl.End()
// //back wall
gl.Begin(gl.POLYGON)
gl.Color3f(0.0, 0.0, 1.0)
gl.Vertex3f(w, delta, delta)
gl.Vertex3f(w, delta, d)
gl.Vertex3f(w, h, d)
gl.Vertex3f(w, h, delta)
gl.End()
}
func drawScene() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
gl.Translatef(0, 0, -3.0)
gl.Rotatef(rotationX, 1, 0, 0)
gl.Rotatef(rotationY, 0, 1, 0)
rotationX += 0.5
rotationY += 0.5
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.Color4f(1, 1, 1, 1)
gl.Begin(gl.QUADS)
gl.Normal3f(0, 0, 1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(-1, -1, 1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(1, -1, 1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(1, 1, 1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(-1, 1, 1)
gl.Normal3f(0, 0, -1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(-1, -1, -1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(-1, 1, -1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(1, 1, -1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(1, -1, -1)
gl.Normal3f(0, 1, 0)
gl.TexCoord2f(0, 1)
gl.Vertex3f(-1, 1, -1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(-1, 1, 1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(1, 1, 1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(1, 1, -1)
gl.Normal3f(0, -1, 0)
gl.TexCoord2f(1, 1)
gl.Vertex3f(-1, -1, -1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(1, -1, -1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(1, -1, 1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(-1, -1, 1)
gl.Normal3f(1, 0, 0)
gl.TexCoord2f(1, 0)
gl.Vertex3f(1, -1, -1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(1, 1, -1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(1, 1, 1)
gl.TexCoord2f(0, 0)
gl.Vertex3f(1, -1, 1)
gl.Normal3f(-1, 0, 0)
gl.TexCoord2f(0, 0)
gl.Vertex3f(-1, -1, -1)
gl.TexCoord2f(1, 0)
gl.Vertex3f(-1, -1, 1)
gl.TexCoord2f(1, 1)
gl.Vertex3f(-1, 1, 1)
gl.TexCoord2f(0, 1)
gl.Vertex3f(-1, 1, -1)
gl.End()
}
// OpenGL draw function
func draw(window *glfw.Window) {
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.PushMatrix()
gl.Disable(gl.LIGHTING)
width, height := window.GetSize()
x := float64(width)
y := float64(height)
h := 0
gl.Color4f(.1, .1, .1, .8)
gl.LineWidth(1.0)
// x方向
var x0, x1, y0, y1 float64
var deltaX, deltaY float64
d := width / 2
x0 = -x
x1 = -x
y0 = -y
y1 = y
deltaX = ((2 * x) / float64(d))
for i := 0; i < d; i++ {
x0 = x0 + deltaX
gl.Begin(gl.LINES)
gl.Vertex3f(float32(x0), float32(y0), float32(h))
gl.Vertex3f(float32(x0), float32(y1), float32(h))
gl.End()
}
// y方向
x0 = -x
x1 = x
deltaY = ((2 * y) / float64(d))
for i := 0; i < d; i++ {
y0 = y0 + deltaY
gl.Begin(gl.LINES)
gl.Vertex3f(float32(x0), float32(y0), float32(h))
gl.Vertex3f(float32(x1), float32(y0), float32(h))
gl.End()
}
gl.PopMatrix()
// draw boxes
for _, room := range rooms {
gl.PushMatrix()
rot := room.Box.Body.Angle() * chipmunk.DegreeConst
gl.Rotatef(float32(rot), 0, 0, 1.0)
x := roundm(float64(room.Box.Body.Position().X), 4.0)
y := roundm(float64(room.Box.Body.Position().Y), 4.0)
gl.Translated(x, y, 0.0)
drawRoom(room)
gl.PopMatrix()
}
}
func (ctx *DrawContext) drawSphere(p vector.V3, r float64, c colorful.Color) {
/* TODO:
- decrease sphere detail if it's further away
- only draw spheres that would be visible inside the frustum:
- (no small spheres near the far plane)
*/
if ctx.cam.SphereInFrustum(p, r) == OUTSIDE {
return
}
gl.Color3f(float32(c.R), float32(c.G), float32(c.B))
gl.MatrixMode(gl.MODELVIEW)
gl.PushMatrix()
defer gl.PopMatrix()
slices := int(math.Max(10, 5*math.Log(r+1)))
gl.Translated(p.X, p.Y, p.Z)
gl.Scaled(r, r, r)
l, ok := uint32(0), false
if ctx.wireframe {
l, ok = ctx.spheresWireframe[slices]
} else {
l, ok = ctx.spheresSolid[slices]
}
if !ok {
ctx.listId++ // XXX: atomic?
l = ctx.listId
gl.NewList(l, gl.COMPILE)
for i := 0; i <= slices; i++ {
lat0 := math.Pi * (-0.5 + float64(i-1)/float64(slices))
z0 := math.Sin(lat0)
zr0 := math.Cos(lat0)
lat1 := math.Pi * (-0.5 + float64(i)/float64(slices))
z1 := math.Sin(lat1)
zr1 := math.Cos(lat1)
if ctx.wireframe {
gl.Begin(gl.LINES)
} else {
gl.Begin(gl.QUAD_STRIP)
}
for j := 0; j <= slices; j++ {
lng := 2 * math.Pi * (float64(j-1) / float64(slices))
x := math.Cos(lng)
y := math.Sin(lng)
gl.Normal3f(float32(x*zr0), float32(y*zr0), float32(z0))
gl.Vertex3f(float32(x*zr0), float32(y*zr0), float32(z0))
gl.Normal3f(float32(x*zr1), float32(y*zr1), float32(z1))
gl.Vertex3f(float32(x*zr1), float32(y*zr1), float32(z1))
}
gl.End()
}
gl.EndList()
if ctx.wireframe {
ctx.spheresWireframe[slices] = l
} else {
ctx.spheresSolid[slices] = l
}
}
gl.CallList(l)
}