// Returns x, y in window co-ordinates at 0 in the z direction
func ProjToWindow(x, y float64) (float64, float64) {
var projmat, modelmat [16]float64
var viewport [4]int32
gl.GetDoublev(gl.PROJECTION_MATRIX, projmat[:])
gl.GetDoublev(gl.MODELVIEW_MATRIX, modelmat[:])
gl.GetIntegerv(gl.VIEWPORT, viewport[:])
px, py, _ := glu.Project(float64(x), float64(y), 0,
&modelmat, &projmat, &viewport)
//return int(px), int(viewport[3]) - int(py)
return px, float64(viewport[3]) - py
}
// Returns x, y in window co-ordinates at 0 in the z direction
func WindowToProj(x, y int) (float64, float64) {
var projmat, modelmat [16]float64
var viewport [4]int32
gl.GetDoublev(gl.PROJECTION_MATRIX, projmat[:])
gl.GetDoublev(gl.MODELVIEW_MATRIX, modelmat[:])
gl.GetIntegerv(gl.VIEWPORT, viewport[:])
// Need to convert so that y is at lower left
y = int(viewport[3]) - y
px, py, _ := glu.UnProject(float64(x), float64(y), 0,
&modelmat, &projmat, &viewport)
return px, py
}
func redraw() {
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
gl.MatrixMode(gl.PROJECTION)
gl.LoadIdentity()
var viewport [4]int32
gl.GetIntegerv(gl.VIEWPORT, viewport[:4])
aspect := float64(viewport[2]) / float64(viewport[3])
glu.Perspective(60, aspect, 1, 100)
gl.MatrixMode(gl.MODELVIEW)
gl.LoadIdentity()
gl.Translatef(POV.X, POV.Y, POV.Z)
gl.Rotatef(POV.Pitch, 1, 0, 0)
gl.Rotatef(POV.Yaw, 0, 1, 0)
gl.Rotatef(POV.Roll, 0, 0, 1)
for x, row := range World {
for z, block := range row {
drawBlock(translateCoordinates(x, 0, z), block)
if x == CursorX && z == CursorZ {
drawCursor()
}
}
}
}
// Returns w, h of viewport
func GetViewportWH() (int, int) {
var viewport [4]int32
gl.GetIntegerv(gl.VIEWPORT, viewport[:])
return int(viewport[2]), int(viewport[3])
}
// Printf draws the given string at the specified coordinates.
// It expects the string to be a single line. Line breaks are not
// handled as line breaks and are rendered as glyphs.
//
// In order to render multi-line text, it is up to the caller to split
// the text up into individual lines of adequate length and then call
// this method for each line seperately.
func (f *Font) Printf(x, y float32, fs string, argv ...interface{}) error {
indices := []rune(fmt.Sprintf(fs, argv...))
if len(indices) == 0 {
return nil
}
// Runes form display list indices.
// For this purpose, they need to be offset by -FontConfig.Low
low := f.Config.Low
for i := range indices {
indices[i] -= low
}
var vp [4]int32
gl.GetIntegerv(gl.VIEWPORT, vp[:])
gl.PushAttrib(gl.TRANSFORM_BIT)
gl.MatrixMode(gl.PROJECTION)
gl.PushMatrix()
gl.LoadIdentity()
gl.Ortho(float64(vp[0]), float64(vp[2]), float64(vp[1]), float64(vp[3]), 0, 1)
gl.PopAttrib()
gl.PushAttrib(gl.LIST_BIT | gl.CURRENT_BIT | gl.ENABLE_BIT | gl.TRANSFORM_BIT)
{
gl.MatrixMode(gl.MODELVIEW)
gl.Disable(gl.LIGHTING)
gl.Disable(gl.DEPTH_TEST)
gl.Enable(gl.BLEND)
gl.Enable(gl.TEXTURE_2D)
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
gl.TexEnvf(gl.TEXTURE_ENV, gl.TEXTURE_ENV_MODE, gl.MODULATE)
f.Texture.Bind(gl.TEXTURE_2D)
var mv [16]float32
gl.GetFloatv(gl.MODELVIEW_MATRIX, mv[:])
gl.PushMatrix()
{
gl.LoadIdentity()
mgw := float32(f.maxGlyphWidth)
mgh := float32(f.maxGlyphHeight)
switch f.Config.Dir {
case LeftToRight, TopToBottom:
gl.Translatef(x, float32(vp[3])-y-mgh, 0)
case RightToLeft:
gl.Translatef(x-mgw, float32(vp[3])-y-mgh, 0)
}
gl.MultMatrixf(&mv)
gl.CallLists(len(indices), gl.UNSIGNED_INT, indices)
}
gl.PopMatrix()
f.Texture.Unbind(gl.TEXTURE_2D)
}
gl.PopAttrib()
gl.PushAttrib(gl.TRANSFORM_BIT)
gl.MatrixMode(gl.PROJECTION)
gl.PopMatrix()
gl.PopAttrib()
return glh.CheckGLError()
}
func getMaxTextureSize() int {
maxTexSize := make([]int32, 1)
gl.GetIntegerv(gl.MAX_TEXTURE_SIZE, maxTexSize)
return int(maxTexSize[0])
}