func renderSwitch(s *Switch) {
gl.LoadIdentity()
// TODO constant
v := SwitchSize / 2
x, y := float32(s.X+v), float32(s.Y+v)
gl.Translatef(x, y, 0)
// Render the switch
gl.Color3f(1, 1, 1)
gl.Begin(gl.TRIANGLE_FAN)
gl.Vertex2d(0, 0)
vv := float64(v)
for i := float64(0); i <= SwitchSegments; i++ {
a := 2 * math.Pi * i / SwitchSegments
gl.Vertex2d(math.Sin(a)*vv, math.Cos(a)*vv)
}
gl.End()
if LineWidth != 0 {
// Render the shape
gl.Color3i(0, 0, 0)
gl.LineWidth(LineWidth)
gl.Begin(gl.LINE_LOOP)
for i := float64(0); i <= SwitchSegments; i++ {
a := 2 * math.Pi * i / SwitchSegments
gl.Vertex2d(math.Sin(a)*vv, math.Cos(a)*vv)
}
gl.End()
}
// Write the switch name
gl.LoadIdentity()
w, h := fonts[6].Metrics(s.name)
gl.Color3i(0, 0, 0)
fonts[6].Printf(x-float32(w)/2, y-float32(h)/2+2, s.name)
}
func renderCorner(color ColorDef, ww, hh, start float64, radius, lineWidth float32) {
setColor(color)
max := BlockCornerSegments * (start + 1)
// Render the corner
gl.Begin(gl.TRIANGLE_FAN)
gl.Vertex2d(ww, hh)
for i := start * BlockCornerSegments; i <= max; i++ {
a := math.Pi / 2 * i / BlockCornerSegments
x := math.Cos(a) * float64(radius)
y := math.Sin(a) * float64(radius)
gl.Vertex2d(ww+x, hh+y)
}
gl.End()
if lineWidth != 0 {
// Render the shape
gl.LineWidth(lineWidth)
gl.Color3i(0, 0, 0)
gl.Begin(gl.LINE_STRIP)
for i := start * BlockCornerSegments; i <= max; i++ {
a := math.Pi / 2 * i / BlockCornerSegments
x := math.Cos(a) * float64(radius)
y := math.Sin(a) * float64(radius)
gl.Vertex2d(ww+x, hh+y)
}
gl.End()
}
}
// Same as Squarei, double co-ordinates
func Squared(x, y, w, h float64) {
u, v, u2, v2 := 0, 1, 1, 0
gl.TexCoord2i(u, v)
gl.Vertex2d(x, y)
gl.TexCoord2i(u2, v)
gl.Vertex2d(x+w, y)
gl.TexCoord2i(u2, v2)
gl.Vertex2d(x+w, y+h)
gl.TexCoord2i(u, v2)
gl.Vertex2d(x, y+h)
}
// 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()
}
// Draws a cross on the screen with known lengths, useful for understanding
// screen dimensions
func DebugLines() {
gl.MatrixMode(gl.PROJECTION)
gl.PushMatrix()
//gl.LoadIdentity()
//gl.Ortho(-2.1, 6.1, -4, 8, 1, -1)
gl.MatrixMode(gl.MODELVIEW)
gl.PushMatrix()
gl.LoadIdentity()
gl.LoadIdentity()
gl.LineWidth(5)
gl.Color4f(1, 1, 0, 1)
gl.Begin(gl.LINES)
gl.Vertex2d(0, -1.6)
gl.Vertex2d(0, 0.8)
gl.Vertex2d(-0.8, 0)
gl.Vertex2d(0.8, 0)
gl.End()
gl.PopMatrix()
gl.MatrixMode(gl.PROJECTION)
gl.PopMatrix()
gl.MatrixMode(gl.MODELVIEW)
}
// vertex draws vertices.
// Used in classic render mode.
func (a *Attr) vertex(i int) {
i *= a.size
switch a.size {
case 2:
switch v := a.data.(type) {
case []int16:
gl.Vertex2s(v[i], v[i+1])
case []int32:
gl.Vertex2i(int(v[i]), int(v[i+1]))
case []float32:
gl.Vertex2f(v[i], v[i+1])
case []float64:
gl.Vertex2d(v[i], v[i+1])
}
case 3:
switch v := a.data.(type) {
case []int16:
gl.Vertex3s(v[i], v[i+1], v[i+2])
case []int32:
gl.Vertex3i(int(v[i]), int(v[i+1]), int(v[i+2]))
case []float32:
gl.Vertex3f(v[i], v[i+1], v[i+2])
case []float64:
gl.Vertex3d(v[i], v[i+1], v[i+2])
}
case 4:
switch v := a.data.(type) {
case []int16:
gl.Vertex4s(v[i], v[i+1], v[i+2], v[i+3])
case []int32:
gl.Vertex4i(int(v[i]), int(v[i+1]), int(v[i+2]), int(v[i+3]))
case []float32:
gl.Vertex4f(v[i], v[i+1], v[i+2], v[i+3])
case []float64:
gl.Vertex4d(v[i], v[i+1], v[i+2], v[i+3])
}
}
}
func (ent *Entity) GlVertex2d(v Vector) {
x, y := v.Rotate(ent.Angle)
gl.Vertex2d(ent.PosX+x, ent.PosY+y)
}
func (char *Char) glVertex2d(x, y float64) {
gl.Vertex2d(char.X+(x*char.Size), char.Y+(y*char.Size))
}
