func (pen *Pen) lineTo(p Point) {
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)
for _, s := range pen.points {
if s.x == 0 && s.y == 0 {
continue
}
if p.distanceTo(s) < 20.0 {
gl.Vertex2i(int(p.x), int(p.y))
gl.Vertex2i(int(s.x), int(s.y))
}
}
gl.End()
pen.n = (pen.n + 1) % len(pen.points)
pen.points[pen.n] = p
pen.moveTo(p)
}
func drawFrame() {
gl.LoadIdentity()
gl.LineWidth(5.0)
gl.Enable(gl.POINT_SMOOTH)
gl.Enable(gl.LINE_SMOOTH)
gl.Color4f(gl.GLfloat(FrameColor[0]), gl.GLfloat(FrameColor[1]), gl.GLfloat(FrameColor[2]), 0.1)
m := PlayArea
t := 1.0 * m
b := -1.0 * m
r := 1.0 * m
l := -1.0 * m
gl.Begin(gl.LINE_STRIP)
zo := -5.0
gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(t), gl.GLfloat(zo))
gl.Vertex3f(gl.GLfloat(r), gl.GLfloat(t), gl.GLfloat(zo))
gl.Vertex3f(gl.GLfloat(r), gl.GLfloat(b), gl.GLfloat(zo))
gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(b), gl.GLfloat(zo))
gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(t), gl.GLfloat(zo))
gl.End()
}
func (f *Font) setupTextRendering(color [3]byte, txt string) (gl.GLuint, *sdl.Surface, *sdl.Surface, *sdl.Surface, int, int) {
//
var texture gl.GLuint
/* Use SDL_TTF to render our text */
var col sdl.Color
col.R = color[0]
col.G = color[1]
col.B = color[2]
// get surface with text
initial := ttf.RenderText_Blended(f.font, txt, col)
/* Convert the rendered text to a known format */
w := next_p2(int(initial.W))
h := next_p2(int(initial.H))
intermediarya := sdl.CreateRGBSurface(0, w, h, 32,
0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000)
var rr *sdl.Rect = nil
intermediarya.Blit(rr, initial, rr)
intermediary := intermediarya.DisplayFormatAlpha()
/* Tell GL about our new texture */
gl.GenTextures(1, &texture)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.TexImage2D(gl.TEXTURE_2D, 0, 4, gl.GLsizei(w), gl.GLsizei(h), 0, gl.BGRA,
gl.UNSIGNED_BYTE, unsafe.Pointer(intermediary.Pixels))
gl.TexEnvi(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.MODULATE)
/* GL_NEAREST looks horrible, if scaled... */
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
/* prepare to render our texture */
gl.Enable(gl.TEXTURE_2D)
gl.BindTexture(gl.TEXTURE_2D, texture)
gl.Color4f(1.0, 1.0, 1.0, 1.0)
gl.Enable(gl.BLEND)
// gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.BlendFunc(gl.ONE, gl.ONE_MINUS_SRC_COLOR) // TODO : MAke real alpha work!
return texture, initial, intermediarya, intermediary, w, h
}
// general OpenGL initialization
func initGL() {
gl.Enable(gl.TEXTURE_2D)
gl.ShadeModel(gl.SMOOTH)
gl.ClearColor(0.0, 0.0, 0.0, 0.5)
gl.ClearDepth(1.0)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LEQUAL)
gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST)
// Setup the light
gl.Lightfv(gl.LIGHT1, gl.AMBIENT, lightAmbient[:]) // ambient lighting
gl.Lightfv(gl.LIGHT1, gl.DIFFUSE, lightDiffuse[:]) // make it diffuse
gl.Lightfv(gl.LIGHT1, gl.POSITION, lightPosition[:]) // and place it
gl.Enable(gl.LIGHT1) // and finally turn it on.
gl.Color4f(1.0, 1.0, 1.0, 0.5) // Full Brightness, 50% Alpha ( NEW )
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE) // Blending Function For Translucency Based On Source Alpha Value ( NEW )
}
// general OpenGL initialization
func initGL() {
LoadGLTextures("data/mud.bmp")
gl.Enable(gl.TEXTURE_2D)
gl.ShadeModel(gl.SMOOTH)
gl.ClearColor(0.0, 0.0, 0.0, 0.0)
gl.ClearDepth(1.0)
gl.Enable(gl.DEPTH_TEST)
gl.DepthFunc(gl.LEQUAL)
gl.Hint(gl.PERSPECTIVE_CORRECTION_HINT, gl.NICEST)
gl.Lightfv(gl.LIGHT1, gl.AMBIENT, lightAmbient[:])
gl.Lightfv(gl.LIGHT1, gl.DIFFUSE, lightDiffuse[:])
gl.Lightfv(gl.LIGHT1, gl.POSITION, lightPosition[:])
gl.Enable(gl.LIGHT1)
gl.Color4f(1.0, 1.0, 1.0, 0.5)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE)
}
func drawWin(d float) {
gl.LoadIdentity()
// gl.LineWidth(5.0)
// gl.Enable(gl.POINT_SMOOTH)
// gl.Enable(gl.LINE_SMOOTH)
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
if d > 1.0 {
d = 1.0
}
c := WinColor
gl.Color4f(gl.GLfloat(c[0]), gl.GLfloat(c[1]), gl.GLfloat(c[2]), gl.GLfloat(d))
m := PlayArea * 4
t := 1.0 * m
b := -1.0 * m
r := 1.0 * m
l := -1.0 * m
gl.Begin(gl.POLYGON)
zo := -10.0
gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(t), gl.GLfloat(zo))
gl.Vertex3f(gl.GLfloat(r), gl.GLfloat(t), gl.GLfloat(zo))
gl.Vertex3f(gl.GLfloat(r), gl.GLfloat(b), gl.GLfloat(zo))
gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(b), gl.GLfloat(zo))
gl.Vertex3f(gl.GLfloat(l), gl.GLfloat(t), gl.GLfloat(zo))
gl.End()
gl.Disable(gl.BLEND)
}
func (f *Font) DrawText3D(pos Vector3, color [3]byte, scale float, txt string) (endw int, endh int) {
gl.LoadIdentity()
// gl.Translatef(gl.GLfloat(pos.X), gl.GLfloat(pos.Y), gl.GLfloat(-4.99));
gl.Translatef(gl.GLfloat(pos.X), gl.GLfloat(pos.Y), gl.GLfloat(-4.99))
gl.Scalef(gl.GLfloat(1.0/64.0*scale), gl.GLfloat(1.0/64.0*scale), gl.GLfloat(1.0))
gl.Disable(gl.DEPTH_TEST)
texture, initial, intermediarya, intermediary, w, h := f.setupTextRendering(color, txt)
wi := gl.GLfloat(w)
he := gl.GLfloat(h)
locX := gl.GLfloat(0) - wi*0.5
locY := gl.GLfloat(0) - he*0.5
/* Draw a quad at location */
gl.Begin(gl.QUADS)
/* Recall that the origin is in the lower-left corner
That is why the TexCoords specify different corners
than the Vertex coors seem to. */
gl.Color4f(1.0, 1.0, 0.0, 1.0)
gl.TexCoord2f(0.0, 1.0)
gl.Vertex3f(locX, locY, 0.0)
gl.TexCoord2f(1.0, 1.0)
gl.Vertex3f(locX+wi, locY, 0.0)
gl.TexCoord2f(1.0, 0.0)
gl.Vertex3f(locX+wi, locY+he, 0.0)
gl.TexCoord2f(0.0, 0.0)
gl.Vertex3f(locX, locY+he, 0.0)
gl.End()
endw, endh = f.teardownTextRendering(texture, initial, intermediarya, intermediary)
gl.Enable(gl.DEPTH_TEST)
return
}
func drawCircle(t *trigger) {
radius := float64(t.Size)
pos := t.Pos
gl.LoadIdentity()
gl.Color4f(gl.GLfloat(t.Col[0]), gl.GLfloat(t.Col[1]), gl.GLfloat(t.Col[2]), gl.GLfloat(t.Col[3]))
gl.LineWidth(2.0)
gl.Translatef(gl.GLfloat(pos.X), gl.GLfloat(pos.Y), gl.GLfloat(pos.Z))
gl.Enable(gl.BLEND)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.Begin(gl.POLYGON)
for i := 0; i < 360; i++ {
var degInRad float64 = float64(i) * DEG2RAD
gl.Vertex3f(gl.GLfloat(math.Cos(degInRad)*radius), gl.GLfloat(math.Sin(degInRad)*radius), gl.GLfloat(0.0))
}
gl.End()
gl.Disable(gl.BLEND)
}
func cube(color []float32) {
gl.Materialfv(gl.FRONT, gl.AMBIENT_AND_DIFFUSE, whiteColor)
gl.Color4f(color[0], color[1], color[2], color[3])
// TOP
gl.Begin(gl.TRIANGLE_FAN)
gl.Vertex3f(cubeWidth, cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, cubeWidth, cubeWidth)
gl.Vertex3f(cubeWidth, cubeWidth, cubeWidth)
gl.End()
// Bottom
gl.Begin(gl.TRIANGLE_FAN)
gl.Vertex3f(cubeWidth, -cubeWidth, cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, -cubeWidth)
gl.Vertex3f(cubeWidth, -cubeWidth, -cubeWidth)
gl.End()
// Front
gl.Begin(gl.TRIANGLE_FAN)
gl.Vertex3f(cubeWidth, cubeWidth, cubeWidth)
gl.Vertex3f(-cubeWidth, cubeWidth, cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, cubeWidth)
gl.Vertex3f(cubeWidth, -cubeWidth, cubeWidth)
gl.End()
// Back
gl.Begin(gl.TRIANGLE_FAN)
gl.Vertex3f(cubeWidth, -cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, cubeWidth, -cubeWidth)
gl.Vertex3f(cubeWidth, cubeWidth, -cubeWidth)
gl.End()
// Left
gl.Begin(gl.TRIANGLE_FAN)
gl.Vertex3f(-cubeWidth, cubeWidth, cubeWidth)
gl.Vertex3f(-cubeWidth, cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, cubeWidth)
gl.End()
// Right
gl.Begin(gl.TRIANGLE_FAN)
gl.Vertex3f(cubeWidth, cubeWidth, -cubeWidth)
gl.Vertex3f(cubeWidth, cubeWidth, cubeWidth)
gl.Vertex3f(cubeWidth, -cubeWidth, cubeWidth)
gl.Vertex3f(cubeWidth, -cubeWidth, -cubeWidth)
gl.End()
//*
gl.Color4f(color[0]/1.2, color[1]/1.2, color[2]/1.2, 1.0)
gl.Begin(gl.LINE_STRIP) // Start Drawing Our Player Using Lines
// TOP
gl.Vertex3f(cubeWidth, cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, cubeWidth, cubeWidth)
gl.Vertex3f(cubeWidth, cubeWidth, cubeWidth)
// Front
gl.Vertex3f(-cubeWidth, cubeWidth, cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, cubeWidth)
gl.Vertex3f(cubeWidth, -cubeWidth, cubeWidth)
// Bottom
gl.Vertex3f(-cubeWidth, -cubeWidth, cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, -cubeWidth)
gl.Vertex3f(cubeWidth, -cubeWidth, -cubeWidth)
// Back
gl.Vertex3f(-cubeWidth, -cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, cubeWidth, -cubeWidth)
gl.Vertex3f(cubeWidth, cubeWidth, -cubeWidth)
// Right
gl.Vertex3f(cubeWidth, cubeWidth, cubeWidth)
gl.Vertex3f(cubeWidth, -cubeWidth, cubeWidth)
gl.Vertex3f(cubeWidth, -cubeWidth, -cubeWidth)
// Left
gl.Vertex3f(-cubeWidth, cubeWidth, cubeWidth)
gl.Vertex3f(-cubeWidth, cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, -cubeWidth)
gl.Vertex3f(-cubeWidth, -cubeWidth, cubeWidth)
gl.End()
//*/
}