119 lines
2.6 KiB
Go
119 lines
2.6 KiB
Go
// Open an OpenGl window and display a rectangle using a OpenGl GraphicContext
|
|
package main
|
|
|
|
import (
|
|
"image/color"
|
|
"log"
|
|
"runtime"
|
|
|
|
"git.fromouter.space/crunchy-rocks/draw2d"
|
|
"git.fromouter.space/crunchy-rocks/draw2d/draw2dgl"
|
|
"git.fromouter.space/crunchy-rocks/draw2d/draw2dkit"
|
|
"github.com/go-gl/gl/v2.1/gl"
|
|
"github.com/go-gl/glfw/v3.1/glfw"
|
|
)
|
|
|
|
var (
|
|
// global rotation
|
|
rotate int
|
|
width, height int
|
|
redraw = true
|
|
font draw2d.FontData
|
|
)
|
|
|
|
func reshape(window *glfw.Window, w, h int) {
|
|
gl.ClearColor(1, 1, 1, 1)
|
|
/* Establish viewing area to cover entire window. */
|
|
gl.Viewport(0, 0, int32(w), int32(h))
|
|
/* PROJECTION Matrix mode. */
|
|
gl.MatrixMode(gl.PROJECTION)
|
|
/* Reset project matrix. */
|
|
gl.LoadIdentity()
|
|
/* Map abstract coords directly to window coords. */
|
|
gl.Ortho(0, float64(w), 0, float64(h), -1, 1)
|
|
/* Invert Y axis so increasing Y goes down. */
|
|
gl.Scalef(1, -1, 1)
|
|
/* Shift origin up to upper-left corner. */
|
|
gl.Translatef(0, float32(-h), 0)
|
|
gl.Enable(gl.BLEND)
|
|
gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)
|
|
gl.Disable(gl.DEPTH_TEST)
|
|
width, height = w, h
|
|
redraw = true
|
|
}
|
|
|
|
// Ask to refresh
|
|
func invalidate() {
|
|
redraw = true
|
|
}
|
|
|
|
func display() {
|
|
gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
|
|
|
|
gl.LineWidth(1)
|
|
gc := draw2dgl.NewGraphicContext(width, height)
|
|
gc.SetFontData(draw2d.FontData{
|
|
Name: "luxi",
|
|
Family: draw2d.FontFamilyMono,
|
|
Style: draw2d.FontStyleBold | draw2d.FontStyleItalic})
|
|
|
|
gc.BeginPath()
|
|
draw2dkit.RoundedRectangle(gc, 200, 200, 600, 600, 100, 100)
|
|
|
|
gc.SetFillColor(color.RGBA{0, 0, 0, 0xff})
|
|
gc.Fill()
|
|
|
|
gl.Flush() /* Single buffered, so needs a flush. */
|
|
}
|
|
|
|
func init() {
|
|
runtime.LockOSThread()
|
|
}
|
|
|
|
func main() {
|
|
err := glfw.Init()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
defer glfw.Terminate()
|
|
width, height = 800, 800
|
|
window, err := glfw.CreateWindow(width, height, "Show RoundedRect", nil, nil)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
window.MakeContextCurrent()
|
|
window.SetSizeCallback(reshape)
|
|
window.SetKeyCallback(onKey)
|
|
window.SetCharCallback(onChar)
|
|
|
|
glfw.SwapInterval(1)
|
|
|
|
err = gl.Init()
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
reshape(window, width, height)
|
|
for !window.ShouldClose() {
|
|
if redraw {
|
|
display()
|
|
window.SwapBuffers()
|
|
redraw = false
|
|
}
|
|
glfw.PollEvents()
|
|
// time.Sleep(2 * time.Second)
|
|
}
|
|
}
|
|
|
|
func onChar(w *glfw.Window, char rune) {
|
|
log.Println(char)
|
|
}
|
|
|
|
func onKey(w *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
|
|
switch {
|
|
case key == glfw.KeyEscape && action == glfw.Press,
|
|
key == glfw.KeyQ && action == glfw.Press:
|
|
w.SetShouldClose(true)
|
|
}
|
|
}
|