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textbox.go
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textbox.go
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package glmenu
import (
"github.com/4ydx/gltext/v4.1"
"github.com/go-gl/gl/v4.1-core/gl"
"github.com/go-gl/glfw/v3.2/glfw"
"github.com/go-gl/mathgl/mgl32"
"time"
)
var textboxVertexShader string = `
#version 330
uniform mat4 orthographic_matrix;
uniform vec2 final_position;
in vec4 centered_position;
void main() {
vec4 center = orthographic_matrix * centered_position;
gl_Position = vec4(center.x + final_position.x, center.y + final_position.y, center.z, center.w);
}
` + "\x00"
var textboxFragmentShader string = `
#version 330
uniform vec3 background;
out vec4 fragment_color;
void main() {
fragment_color = vec4(background, 1);
}
` + "\x00"
type TextBoxInteraction func(
textbox *TextBox,
xPos, yPos float64,
button MouseClick,
isInBoundingBox bool,
)
type TextBox struct {
Menu *Menu
Text *v41.Text
Cursor *v41.Text
CursorIndex int // position of the cursor within the text
CursorBarFrequency int64 // how long does each flash cycle last (visible -> invisible -> visible)
MaxLength int
Time time.Time
IsEdit bool
IsClick bool
// user defined
OnClick TextBoxInteraction
OnRelease TextBoxInteraction
FilterRune func(r rune) bool
// opengl oriented
program uint32
glMatrix int32
position uint32
vao uint32
vbo uint32
ebo uint32
vboData []float32
vboIndexCount int
eboData []int32
eboIndexCount int
centeredPosition uint32
backgroundUniform int32
borderBackground mgl32.Vec3
textBackground mgl32.Vec3
finalPositionUniform int32
finalPosition mgl32.Vec2
orthographicMatrixUniform int32
// X1, X2: the lower left and upper right points of a box that bounds the text
X1 Point
X2 Point
BorderWidth int32
height float32
width float32
Position mgl32.Vec2
}
func (textbox *TextBox) Height() float32 {
return textbox.height
}
func (textbox *TextBox) Width() float32 {
return textbox.width
}
func (textbox *TextBox) GetPosition() mgl32.Vec2 {
return textbox.Text.Position
}
func (textbox *TextBox) GetPadding() Padding {
return Padding{}
}
func (textbox *TextBox) Load(menu *Menu, width, height float32, borderWidth int32) (err error) {
textbox.Menu = menu
// text
textbox.CursorBarFrequency = time.Duration.Nanoseconds(500000000)
textbox.Text = v41.NewText(menu.Font, 1.0, 1.1)
textbox.Cursor = v41.NewText(menu.Font, 1.0, 1.1)
textbox.Cursor.SetString("|")
// border formatting
textbox.BorderWidth = borderWidth
textbox.height = height
textbox.width = width
textbox.X1.X = -float32(width) / 2.0
textbox.X1.Y = -float32(height) / 2.0
textbox.X2.X = float32(width) / 2.0
textbox.X2.Y = float32(height) / 2.0
textbox.borderBackground = mgl32.Vec3{1.0, 1.0, 1.0}
textbox.textBackground = mgl32.Vec3{0.0, 0.0, 0.0}
// create shader program and define attributes and uniforms
textbox.program, err = v41.NewProgram(textboxVertexShader, textboxFragmentShader)
if err != nil {
return err
}
// ebo, vbo data
// 4 border edges (4 vertices apiece with 2 position points per index)
// 1 background square (4 vertices x 2 positions)
textbox.vboIndexCount = 4*4*2 + 1*4*2
textbox.eboIndexCount = 4*6 + 1*6
textbox.vboData = make([]float32, textbox.vboIndexCount, textbox.vboIndexCount)
textbox.eboData = make([]int32, textbox.eboIndexCount, textbox.eboIndexCount)
textbox.makeBufferData()
// attributes
textbox.centeredPosition = uint32(gl.GetAttribLocation(textbox.program, gl.Str("centered_position\x00")))
// uniforms
textbox.backgroundUniform = gl.GetUniformLocation(textbox.program, gl.Str("background\x00"))
textbox.finalPositionUniform = gl.GetUniformLocation(textbox.program, gl.Str("final_position\x00"))
textbox.orthographicMatrixUniform = gl.GetUniformLocation(textbox.program, gl.Str("orthographic_matrix\x00"))
gl.GenVertexArrays(1, &textbox.vao)
gl.GenBuffers(1, &textbox.vbo)
gl.GenBuffers(1, &textbox.ebo)
glfloatSize := int32(4)
// vao
gl.BindVertexArray(textbox.vao)
// vbo
gl.BindBuffer(gl.ARRAY_BUFFER, textbox.vbo)
gl.EnableVertexAttribArray(textbox.centeredPosition)
gl.VertexAttribPointer(
textbox.centeredPosition,
2,
gl.FLOAT,
false,
0,
gl.PtrOffset(0),
)
gl.BufferData(gl.ARRAY_BUFFER, int(glfloatSize)*textbox.vboIndexCount, gl.Ptr(textbox.vboData), gl.DYNAMIC_DRAW)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, textbox.ebo)
gl.BufferData(gl.ELEMENT_ARRAY_BUFFER, int(glfloatSize)*textbox.eboIndexCount, gl.Ptr(textbox.eboData), gl.DYNAMIC_DRAW)
gl.BindVertexArray(0)
gl.BindBuffer(gl.ARRAY_BUFFER, 0)
gl.BindBuffer(gl.ELEMENT_ARRAY_BUFFER, 0)
return
}
// X1: lower left hand point
// X2: upper right hand point
// using the X1 and X2 values a border is built using 4 quads: left, right, top and bottom
// - left and right quads expand above and below based on the border width
// - top and bottom quads horizontal width does not include the border width
func (textbox *TextBox) makeBufferData() {
// this all works because the original positioning is centered around the origin
// left border edge
// vbo data (ebo data value)
// 0,1 (0) -> first point of the quad which is drawn CCW
// 2,3 (1) -> second point
// 4,5 (2) -> third point
// 6,7 (3) -> fourth point
// one triangle is drawn using 0,1,2 and the next using 0,2,3 - this pattern applies to all edges (left, right, top, bottom)
textbox.vboData[0] = textbox.X1.X
textbox.vboData[1] = textbox.X2.Y + float32(textbox.BorderWidth)
textbox.vboData[2] = textbox.X1.X - float32(textbox.BorderWidth)
textbox.vboData[3] = textbox.X2.Y + float32(textbox.BorderWidth)
textbox.vboData[4] = textbox.X1.X - float32(textbox.BorderWidth)
textbox.vboData[5] = textbox.X1.Y - float32(textbox.BorderWidth)
textbox.vboData[6] = textbox.X1.X
textbox.vboData[7] = textbox.X1.Y - float32(textbox.BorderWidth)
textbox.eboData[0], textbox.eboData[1], textbox.eboData[2], textbox.eboData[3], textbox.eboData[4], textbox.eboData[5] = 0, 1, 2, 0, 2, 3
// top border edge - intentionally leaves out the borderwidth on the x-axis
textbox.vboData[8] = textbox.X2.X
textbox.vboData[9] = textbox.X2.Y + float32(textbox.BorderWidth)
textbox.vboData[10] = textbox.X1.X
textbox.vboData[11] = textbox.X2.Y + float32(textbox.BorderWidth)
textbox.vboData[12] = textbox.X1.X
textbox.vboData[13] = textbox.X2.Y
textbox.vboData[14] = textbox.X2.X
textbox.vboData[15] = textbox.X2.Y
textbox.eboData[6], textbox.eboData[7], textbox.eboData[8], textbox.eboData[9], textbox.eboData[10], textbox.eboData[11] = 4, 5, 6, 4, 6, 7
// bottom border edge - intentionally leaves out the borderwidth on the x-axis
textbox.vboData[16] = textbox.X2.X
textbox.vboData[17] = textbox.X1.Y
textbox.vboData[18] = textbox.X1.X
textbox.vboData[19] = textbox.X1.Y
textbox.vboData[20] = textbox.X1.X
textbox.vboData[21] = textbox.X1.Y - float32(textbox.BorderWidth)
textbox.vboData[22] = textbox.X2.X
textbox.vboData[23] = textbox.X1.Y - float32(textbox.BorderWidth)
textbox.eboData[12], textbox.eboData[13], textbox.eboData[14], textbox.eboData[15], textbox.eboData[16], textbox.eboData[17] = 8, 9, 10, 8, 10, 11
// right border edge
textbox.vboData[24] = textbox.X2.X + float32(textbox.BorderWidth)
textbox.vboData[25] = textbox.X2.Y + float32(textbox.BorderWidth)
textbox.vboData[26] = textbox.X2.X
textbox.vboData[27] = textbox.X2.Y + float32(textbox.BorderWidth)
textbox.vboData[28] = textbox.X2.X
textbox.vboData[29] = textbox.X1.Y - float32(textbox.BorderWidth)
textbox.vboData[30] = textbox.X2.X + float32(textbox.BorderWidth)
textbox.vboData[31] = textbox.X1.Y - float32(textbox.BorderWidth)
textbox.eboData[18], textbox.eboData[19], textbox.eboData[20], textbox.eboData[21], textbox.eboData[22], textbox.eboData[23] = 12, 13, 14, 12, 14, 15
// background
textbox.vboData[32] = textbox.X2.X
textbox.vboData[33] = textbox.X2.Y
textbox.vboData[34] = textbox.X1.X
textbox.vboData[35] = textbox.X2.Y
textbox.vboData[36] = textbox.X1.X
textbox.vboData[37] = textbox.X1.Y
textbox.vboData[38] = textbox.X2.X
textbox.vboData[39] = textbox.X1.Y
textbox.eboData[24], textbox.eboData[25], textbox.eboData[26], textbox.eboData[27], textbox.eboData[28], textbox.eboData[29] = 16, 17, 18, 16, 18, 19
}
func (textbox *TextBox) SetColor(color mgl32.Vec3) {
textbox.Text.SetColor(color)
textbox.Cursor.SetColor(color)
}
func (textbox *TextBox) SetString(str string, argv ...interface{}) {
if len(argv) == 0 {
textbox.Text.SetString(str)
} else {
textbox.Text.SetString(str, argv)
}
}
func (textbox *TextBox) Draw() {
if time.Since(textbox.Time).Nanoseconds() > textbox.CursorBarFrequency {
if textbox.Cursor.RuneCount == 0 && textbox.IsEdit {
textbox.Cursor.RuneCount = 1
} else {
textbox.Cursor.RuneCount = 0
}
textbox.Time = time.Now()
}
gl.UseProgram(textbox.program)
// draw
gl.BindVertexArray(textbox.vao)
// uniforms
gl.Uniform2fv(textbox.finalPositionUniform, 1, &textbox.finalPosition[0])
gl.UniformMatrix4fv(textbox.orthographicMatrixUniform, 1, false, &textbox.Menu.Font.OrthographicMatrix[0])
// draw border - 4 * 6: four quads with six indices apiece starting at the beginning of the vbo (0)
gl.Uniform3fv(textbox.backgroundUniform, 1, &textbox.borderBackground[0])
gl.DrawElementsBaseVertex(gl.TRIANGLES, int32(4*6), gl.UNSIGNED_INT, nil, int32(0))
// draw background - start drawing after skipping the border vertices (16)
gl.Uniform3fv(textbox.backgroundUniform, 1, &textbox.textBackground[0])
gl.DrawElementsBaseVertex(gl.TRIANGLES, int32(1*6), gl.UNSIGNED_INT, nil, int32(16))
gl.BindVertexArray(0)
textbox.Text.Draw()
textbox.Cursor.Draw()
}
func (textbox *TextBox) KeyRelease(key glfw.Key, withShift bool) {
if textbox.IsEdit {
switch key {
case glfw.KeyBackspace:
textbox.Backspace()
case glfw.KeyEscape:
textbox.IsEdit = false
case glfw.KeyLeft:
textbox.MoveCursor(-1)
case glfw.KeyRight:
textbox.MoveCursor(+1)
default:
textbox.Edit(key, withShift)
}
}
}
func (textbox *TextBox) Edit(key glfw.Key, withShift bool) {
if textbox.Text.HasRune(rune(key)) {
processRune := true
if textbox.FilterRune != nil {
processRune = textbox.FilterRune(rune(key))
}
if processRune {
var theRune rune
if !withShift && key >= 65 && key <= 90 {
theRune = rune(key) + 32
} else {
theRune = rune(key)
}
if textbox.Text.MaxRuneCount > 0 && len(textbox.Text.String) == textbox.Text.MaxRuneCount {
// too long - do nothing
} else {
index := textbox.CursorIndex
r := make([]rune, len(textbox.Text.String)+1)
copy(r, []rune(textbox.Text.String))
copy(r[index+1:], r[index:])
r[index] = theRune
index += 1
textbox.CursorIndex = index
textbox.Text.SetString(string(r))
textbox.Text.SetPosition(textbox.Text.Position)
textbox.Cursor.SetPosition(
mgl32.Vec2{
textbox.Text.Position.X() + float32(textbox.Text.CharPosition(index)),
textbox.Text.Position.Y(),
})
}
}
}
}
func (textbox *TextBox) SetPosition(v mgl32.Vec2) {
// transform to orthographic coordinates ranged -1 to 1 for the shader
textbox.finalPosition[0] = v.X() / (textbox.Menu.Font.WindowWidth / 2)
textbox.finalPosition[1] = v.Y() / (textbox.Menu.Font.WindowHeight / 2)
// used to build shadow data and for calling SetPosition again when needed
textbox.Position = v
textbox.Text.SetPosition(v)
textbox.Cursor.SetPosition(v)
}
func (textbox *TextBox) GetBoundingBox() (X1, X2 Point) {
x, y := textbox.Position.X(), textbox.Position.Y()
X1.X = textbox.X1.X + x
X1.Y = textbox.X1.Y + y
X2.X = textbox.X2.X + x
X2.Y = textbox.X2.Y + y
return
}
func (textbox *TextBox) Backspace() {
index := textbox.CursorIndex
if len(textbox.Text.String) > 0 {
r := make([]rune, len(textbox.Text.String)-1)
copy(r, []rune(textbox.Text.String[0:index-1]))
copy(r[index-1:], []rune(textbox.Text.String[index:]))
// shift our cursor back
index -= 1
textbox.CursorIndex = index
textbox.Text.SetString(string(r))
textbox.Text.SetPosition(textbox.Text.Position)
textbox.Cursor.SetPosition(
mgl32.Vec2{
textbox.Text.Position.X() + float32(textbox.Text.CharPosition(index)),
textbox.Text.Position.Y(),
})
}
}
func (textbox *TextBox) OrthoToScreenCoord() (X1 Point, X2 Point) {
x1, x2 := textbox.GetBoundingBox()
X1.X = x1.X + textbox.Menu.WindowWidth/2
X1.Y = x1.Y + textbox.Menu.WindowHeight/2
X2.X = x2.X + textbox.Menu.WindowWidth/2
X2.Y = x2.Y + textbox.Menu.WindowHeight/2
return
}
// InsidePoint returns a point nearby the center of the label
// Used to locate a screen position where clicking can be simulated
// Click on the right side in order to place the cursor to the very right of any text
func (textbox *TextBox) InsidePoint() (P Point) {
X1, X2 := textbox.OrthoToScreenCoord()
P.X = (X2.X - 0.1)
P.Y = (X2.Y-X1.Y)/2 + X1.Y
return
}
func (textbox *TextBox) ImmediateCursorDraw() {
textbox.Cursor.RuneCount = 1
textbox.Time = time.Now()
}
func (textbox *TextBox) MoveCursor(offset int) {
if textbox.CursorIndex >= 0 && (textbox.CursorIndex <= len(textbox.Text.String)) {
textbox.CursorIndex += offset
if textbox.CursorIndex < 0 {
textbox.CursorIndex = 0
}
if textbox.CursorIndex > len(textbox.Text.String) {
textbox.CursorIndex = len(textbox.Text.String)
}
textbox.Cursor.SetPosition(
mgl32.Vec2{
textbox.Text.Position.X() + float32(textbox.Text.CharPosition(textbox.CursorIndex)),
textbox.Text.Position.Y(),
})
textbox.ImmediateCursorDraw()
}
}
func (textbox *TextBox) IsClicked(xPos, yPos float64, button MouseClick) {
// menu rendering (and text) is positioned in orthographic projection coordinates
// but click positions are based on window coordinates
// we have to transform them
X1, X2 := textbox.OrthoToScreenCoord()
inBox := float32(xPos) > X1.X && float32(xPos) < X2.X && float32(yPos) > X1.Y && float32(yPos) < X2.Y
if inBox {
index, side := textbox.Text.ClickedCharacter(xPos, float64(textbox.Menu.screenPositionOffset[0]))
if side == v41.CSRight {
index++
}
// empty string
if side == v41.CSUnknown {
index = 0
}
textbox.CursorIndex = index
textbox.ImmediateCursorDraw()
textbox.Cursor.SetPosition(
mgl32.Vec2{
textbox.Text.Position.X() + float32(textbox.Text.CharPosition(index)),
textbox.Text.Position.Y(),
})
textbox.IsClick = true
if textbox.OnClick != nil {
textbox.OnClick(textbox, xPos, yPos, button, inBox)
}
} else {
textbox.IsEdit = false
}
}
func (textbox *TextBox) IsReleased(xPos, yPos float64, button MouseClick) {
// anything flagged as clicked now needs to decide whether to execute its logic based on inBox
X1, X2 := textbox.OrthoToScreenCoord()
inBox := float32(xPos) > X1.X && float32(xPos) < X2.X && float32(yPos) > X1.Y && float32(yPos) < X2.Y
if textbox.IsClick {
textbox.IsEdit = true
if textbox.OnRelease != nil {
textbox.OnRelease(textbox, xPos, yPos, button, inBox)
}
}
textbox.IsClick = false
}
func (textbox *TextBox) NavigateTo() {
if !textbox.IsEdit {
point := textbox.InsidePoint()
textbox.IsClicked(float64(point.X), float64(point.Y), MouseLeft)
textbox.IsReleased(float64(point.X), float64(point.Y), MouseLeft)
}
}
func (textbox *TextBox) NavigateAway() bool {
if textbox.IsEdit {
textbox.IsEdit = false
return true
}
return false
}
func (textbox *TextBox) Follow() bool {
if textbox.IsEdit {
return true
}
return false
}
func (textbox *TextBox) IsNoop() bool {
return false
}
func (textbox *TextBox) Type() FormatableType {
return FormatableTextbox
}