func (l *legacyShader) Pre() {
Gl.Enable(Gl.BLEND)
Gl.BlendFunc(Gl.SRC_ALPHA, Gl.ONE_MINUS_SRC_ALPHA)
// Bind shader and buffer, enable attributes
Gl.UseProgram(l.program)
Gl.EnableVertexAttribArray(l.inPosition)
Gl.EnableVertexAttribArray(l.inColor)
if scaleOnResize {
l.projectionMatrix[0] = 1 / (gameWidth / 2)
l.projectionMatrix[4] = 1 / (-gameHeight / 2)
} else {
l.projectionMatrix[0] = 1 / (windowWidth / 2) // TODO: canvasWidth
l.projectionMatrix[4] = 1 / (-windowHeight / 2) // TODO: canvasHeight
}
if l.cameraEnabled {
l.viewMatrix[1], l.viewMatrix[0] = math.Sincos(cam.angle * math.Pi / 180)
l.viewMatrix[3] = -l.viewMatrix[1]
l.viewMatrix[4] = l.viewMatrix[0]
l.viewMatrix[6] = -cam.x
l.viewMatrix[7] = -cam.y
l.viewMatrix[8] = cam.z
} else {
l.viewMatrix[6] = -1 / l.projectionMatrix[0]
l.viewMatrix[7] = 1 / l.projectionMatrix[4]
}
Gl.UniformMatrix3fv(l.matrixProjection, false, l.projectionMatrix)
Gl.UniformMatrix3fv(l.matrixView, false, l.viewMatrix)
Gl.Uniform2f(l.inViewport, gameWidth, gameHeight) // TODO: canvasWidth/Height
}
func (s *basicShader) Pre() {
Gl.Enable(Gl.BLEND)
Gl.BlendFunc(Gl.SRC_ALPHA, Gl.ONE_MINUS_SRC_ALPHA)
// Enable shader and buffer, enable attributes in shader
Gl.UseProgram(s.program)
Gl.BindBuffer(Gl.ELEMENT_ARRAY_BUFFER, s.indexVBO)
Gl.EnableVertexAttribArray(s.inPosition)
Gl.EnableVertexAttribArray(s.inTexCoords)
Gl.EnableVertexAttribArray(s.inColor)
if scaleOnResize {
s.projectionMatrix[0] = 1 / (gameWidth / 2)
s.projectionMatrix[4] = 1 / (-gameHeight / 2)
} else {
s.projectionMatrix[0] = 1 / (windowWidth / 2)
s.projectionMatrix[4] = 1 / (-windowHeight / 2)
}
if s.cameraEnabled {
s.viewMatrix[1], s.viewMatrix[0] = math.Sincos(cam.angle * math.Pi / 180)
s.viewMatrix[3] = -s.viewMatrix[1]
s.viewMatrix[4] = s.viewMatrix[0]
s.viewMatrix[6] = -cam.x
s.viewMatrix[7] = -cam.y
s.viewMatrix[8] = cam.z
} else {
s.viewMatrix[6] = -1 / s.projectionMatrix[0]
s.viewMatrix[7] = 1 / s.projectionMatrix[4]
}
Gl.UniformMatrix3fv(s.matrixProjection, false, s.projectionMatrix)
Gl.UniformMatrix3fv(s.matrixView, false, s.viewMatrix)
}
func (s *basicShader) Draw(ren *RenderComponent, space *SpaceComponent) {
if s.lastBuffer != ren.buffer || ren.buffer == nil {
s.updateBuffer(ren)
Gl.BindBuffer(Gl.ARRAY_BUFFER, ren.buffer)
Gl.VertexAttribPointer(s.inPosition, 2, Gl.FLOAT, false, 20, 0)
Gl.VertexAttribPointer(s.inTexCoords, 2, Gl.FLOAT, false, 20, 8)
Gl.VertexAttribPointer(s.inColor, 4, Gl.UNSIGNED_BYTE, true, 20, 16)
s.lastBuffer = ren.buffer
}
if s.lastTexture != ren.Drawable.Texture() {
Gl.BindTexture(Gl.TEXTURE_2D, ren.Drawable.Texture())
s.lastTexture = ren.Drawable.Texture()
}
if s.lastRepeating != ren.Repeat {
var val int
switch ren.Repeat {
case CLAMP_TO_EDGE:
val = Gl.CLAMP_TO_EDGE
case CLAMP_TO_BORDER:
val = Gl.CLAMP_TO_EDGE
case REPEAT:
val = Gl.REPEAT
case MIRRORED_REPEAT:
val = Gl.MIRRORED_REPEAT
}
Gl.TexParameteri(Gl.TEXTURE_2D, Gl.TEXTURE_WRAP_S, val)
Gl.TexParameteri(Gl.TEXTURE_2D, Gl.TEXTURE_WRAP_T, val)
}
if space.Rotation != 0 {
sin, cos := math.Sincos(space.Rotation * math.Pi / 180)
s.modelMatrix[0] = ren.Scale.X * cos
s.modelMatrix[1] = ren.Scale.X * sin
s.modelMatrix[3] = ren.Scale.Y * -sin
s.modelMatrix[4] = ren.Scale.Y * cos
} else {
s.modelMatrix[0] = ren.Scale.X
s.modelMatrix[1] = 0
s.modelMatrix[3] = 0
s.modelMatrix[4] = ren.Scale.Y
}
s.modelMatrix[6] = space.Position.X
s.modelMatrix[7] = space.Position.Y
Gl.UniformMatrix3fv(s.matrixModel, false, s.modelMatrix)
Gl.DrawElements(Gl.TRIANGLES, 6, Gl.UNSIGNED_SHORT, 0)
}
// AABB returns the minimum and maximum point for the given SpaceComponent. It hereby takes into account the
// rotation of the Component - it may very well be that the Minimum as given by AABB, is smaller than the Position
// of the object (i.e. when rotated). As this method takes into account the rotation, it should be used only when
// required.
func (sc SpaceComponent) AABB() AABB {
if sc.Rotation == 0 {
return AABB{
Min: sc.Position,
Max: Point{sc.Position.X + sc.Width, sc.Position.Y + sc.Height},
}
}
sin, cos := math.Sincos(sc.Rotation * math.Pi / 180)
xmin := sc.Position.X
xmax := sc.Position.X + sc.Width*cos - sc.Height*sin
ymin := sc.Position.Y
ymax := sc.Position.Y + sc.Height*cos + sc.Width*sin
var (
X_MIN, X_MAX, Y_MIN, Y_MAX float32
)
if xmin < xmax {
X_MIN = xmin
X_MAX = xmax
} else {
X_MIN = xmax
X_MAX = xmin
}
if ymin < ymax {
Y_MIN = ymin
Y_MAX = ymax
} else {
Y_MIN = ymax
Y_MAX = ymin
}
return AABB{Point{X_MIN, Y_MIN}, Point{X_MAX, Y_MAX}}
}
func (l *legacyShader) Draw(ren *RenderComponent, space *SpaceComponent) {
if l.lastBuffer != ren.buffer || ren.buffer == nil {
l.updateBuffer(ren, space)
Gl.BindBuffer(Gl.ARRAY_BUFFER, ren.buffer)
Gl.VertexAttribPointer(l.inPosition, 2, Gl.FLOAT, false, 12, 0)
Gl.VertexAttribPointer(l.inColor, 4, Gl.UNSIGNED_BYTE, true, 12, 8)
l.lastBuffer = ren.buffer
}
if space.Rotation != 0 {
sin, cos := math.Sincos(space.Rotation * math.Pi / 180)
l.modelMatrix[0] = ren.Scale.X * cos
l.modelMatrix[1] = ren.Scale.X * sin
l.modelMatrix[3] = ren.Scale.Y * -sin
l.modelMatrix[4] = ren.Scale.Y * cos
} else {
l.modelMatrix[0] = ren.Scale.X
l.modelMatrix[1] = 0
l.modelMatrix[3] = 0
l.modelMatrix[4] = ren.Scale.Y
}
l.modelMatrix[6] = space.Position.X
l.modelMatrix[7] = space.Position.Y
Gl.UniformMatrix3fv(l.matrixModel, false, l.modelMatrix)
switch shape := ren.Drawable.(type) {
case Triangle:
Gl.Uniform2f(l.inRadius, 0, 0)
Gl.DrawArrays(Gl.TRIANGLES, 0, 3)
if shape.BorderWidth > 0 {
borderWidth := shape.BorderWidth
if l.cameraEnabled {
borderWidth /= cam.z
}
Gl.LineWidth(borderWidth)
Gl.DrawArrays(Gl.LINE_LOOP, 3, 3)
}
case Rectangle:
Gl.Uniform2f(l.inRadius, 0, 0)
Gl.BindBuffer(Gl.ELEMENT_ARRAY_BUFFER, l.indicesRectanglesVBO)
Gl.DrawElements(Gl.TRIANGLES, 6, Gl.UNSIGNED_SHORT, 0)
if shape.BorderWidth > 0 {
borderWidth := shape.BorderWidth
if l.cameraEnabled {
borderWidth /= cam.z
}
Gl.LineWidth(borderWidth)
Gl.DrawArrays(Gl.LINE_LOOP, 4, 4)
}
case Circle:
Gl.Uniform1f(l.inBorderWidth, shape.BorderWidth/cam.z)
if shape.BorderWidth > 0 {
r, g, b, a := shape.BorderColor.RGBA()
Gl.Uniform4f(l.inBorderColor, float32(r>>8), float32(g>>8), float32(b>>8), float32(a>>8))
}
Gl.Uniform2f(l.inRadius, (space.Width/2)/cam.z, (space.Height/2)/cam.z)
Gl.Uniform2f(l.inCenter, space.Width/2, space.Height/2)
Gl.BindBuffer(Gl.ELEMENT_ARRAY_BUFFER, l.indicesRectanglesVBO)
Gl.DrawElements(Gl.TRIANGLES, 6, Gl.UNSIGNED_SHORT, 0)
case ComplexTriangles:
Gl.Uniform2f(l.inRadius, 0, 0)
Gl.DrawArrays(Gl.TRIANGLES, 0, len(shape.Points))
if shape.BorderWidth > 0 {
borderWidth := shape.BorderWidth
if l.cameraEnabled {
borderWidth /= cam.z
}
Gl.LineWidth(borderWidth)
Gl.DrawArrays(Gl.LINE_LOOP, len(shape.Points), len(shape.Points))
}
default:
unsupportedType()
}
}
func (m *MouseSystem) Update(dt float32) {
// Translate Mouse.X and Mouse.Y into "game coordinates"
m.mouseX = Mouse.X*cam.z*(gameWidth/windowWidth) + cam.x - (gameWidth/2)*cam.z
m.mouseY = Mouse.Y*cam.z*(gameHeight/windowHeight) + cam.y - (gameHeight/2)*cam.z // TODO maybe other width/height?
// Rotate if needed
if cam.angle != 0 {
sin, cos := math.Sincos(cam.angle * math.Pi / 180)
m.mouseX, m.mouseY = m.mouseX*cos+m.mouseY*sin, m.mouseY*cos-m.mouseX*sin
}
for _, e := range m.entities {
// Reset all values except these
*e.MouseComponent = MouseComponent{
Track: e.MouseComponent.Track,
Hovered: e.MouseComponent.Hovered,
startedDragging: e.MouseComponent.startedDragging,
}
if e.MouseComponent.Track {
// track mouse position so that systems that need to stay on the mouse
// position can do it (think an RTS when placing a new building and
// you get a ghost building following your mouse until you click to
// place it somewhere in your world.
e.MouseComponent.MouseX = m.mouseX
e.MouseComponent.MouseY = m.mouseY
}
mx := m.mouseX
my := m.mouseY
if e.SpaceComponent == nil {
continue // with other entities
}
if e.RenderComponent != nil {
// Hardcoded special case for the HUD | TODO: make generic instead of hardcoding
if e.RenderComponent.shader == HUDShader {
mx = Mouse.X
my = Mouse.Y
}
}
// if the Mouse component is a tracker we always update it
// Check if the X-value is within range
// and if the Y-value is within range
pos := e.SpaceComponent.AABB()
if e.MouseComponent.Track || e.MouseComponent.startedDragging ||
mx > pos.Min.X && mx < pos.Max.X && my > pos.Min.Y && my < pos.Max.Y {
e.MouseComponent.Enter = !e.MouseComponent.Hovered
e.MouseComponent.Hovered = true
e.MouseComponent.Released = false
if !e.MouseComponent.Track {
// If we're tracking, we've already set these
e.MouseComponent.MouseX = mx
e.MouseComponent.MouseY = my
}
switch Mouse.Action {
case PRESS:
switch Mouse.Button {
case MouseButtonLeft:
e.MouseComponent.startedDragging = true
e.MouseComponent.Clicked = true
case MouseButtonRight:
e.MouseComponent.RightClicked = true
}
m.mouseDown = true
case RELEASE:
switch Mouse.Button {
case MouseButtonLeft:
e.MouseComponent.Released = true
case MouseButtonRight:
e.MouseComponent.RightReleased = true
}
case MOVE:
if m.mouseDown && e.MouseComponent.startedDragging {
e.MouseComponent.Dragged = true
}
}
} else {
if e.MouseComponent.Hovered {
e.MouseComponent.Leave = true
}
e.MouseComponent.Hovered = false
}
if Mouse.Action == RELEASE {
// dragging stops as soon as one of the currently pressed buttons
// is released
e.MouseComponent.Dragged = false
e.MouseComponent.startedDragging = false
// mouseDown goes false as soon as one of the pressed buttons is
// released. Effectively ending any dragging
m.mouseDown = false
}
// propagate the modifiers to the mouse component so that game
// implementers can take different decisions based on those
e.MouseComponent.Modifier = Mouse.Modifer
}
}