105 lines
2.9 KiB
Go
105 lines
2.9 KiB
Go
package imgui_backend
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import (
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imgui "github.com/FooSoft/imgui-go"
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"github.com/FooSoft/lazarus/math"
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"github.com/go-gl/gl/v2.1/gl"
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"github.com/veandco/go-sdl2/sdl"
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)
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type Context struct {
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buttonsDown [3]bool
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lastTime uint64
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fontTexture uint32
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displaySize math.Vec2i
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bufferSize math.Vec2i
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}
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func CreateContext(displaySize, bufferSize math.Vec2i) (*Context, error) {
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singleton.refCount++
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if singleton.refCount == 1 {
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singleton.context = imgui.CreateContext(nil)
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keys := map[int]int{
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imgui.KeyTab: sdl.SCANCODE_TAB,
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imgui.KeyLeftArrow: sdl.SCANCODE_LEFT,
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imgui.KeyRightArrow: sdl.SCANCODE_RIGHT,
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imgui.KeyUpArrow: sdl.SCANCODE_UP,
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imgui.KeyDownArrow: sdl.SCANCODE_DOWN,
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imgui.KeyPageUp: sdl.SCANCODE_PAGEUP,
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imgui.KeyPageDown: sdl.SCANCODE_PAGEDOWN,
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imgui.KeyHome: sdl.SCANCODE_HOME,
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imgui.KeyEnd: sdl.SCANCODE_END,
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imgui.KeyInsert: sdl.SCANCODE_INSERT,
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imgui.KeyDelete: sdl.SCANCODE_DELETE,
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imgui.KeyBackspace: sdl.SCANCODE_BACKSPACE,
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imgui.KeySpace: sdl.SCANCODE_BACKSPACE,
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imgui.KeyEnter: sdl.SCANCODE_RETURN,
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imgui.KeyEscape: sdl.SCANCODE_ESCAPE,
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imgui.KeyA: sdl.SCANCODE_A,
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imgui.KeyC: sdl.SCANCODE_C,
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imgui.KeyV: sdl.SCANCODE_V,
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imgui.KeyX: sdl.SCANCODE_X,
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imgui.KeyY: sdl.SCANCODE_Y,
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imgui.KeyZ: sdl.SCANCODE_Z,
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}
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// Keyboard mapping. ImGui will use those indices to peek into the io.KeysDown[] array.
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io := imgui.CurrentIO()
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for imguiKey, nativeKey := range keys {
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io.KeyMap(imguiKey, nativeKey)
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}
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}
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c := &Context{displaySize: displaySize, bufferSize: bufferSize}
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// Build texture atlas
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io := imgui.CurrentIO()
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image := io.Fonts().TextureDataRGBA32()
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// Store state
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var lastTexture int32
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gl.GetIntegerv(gl.TEXTURE_BINDING_2D, &lastTexture)
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// Create texture
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gl.GenTextures(1, &c.fontTexture)
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gl.BindTexture(gl.TEXTURE_2D, c.fontTexture)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR)
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gl.TexParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR)
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gl.PixelStorei(gl.UNPACK_ROW_LENGTH, 0)
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gl.TexImage2D(gl.TEXTURE_2D, 0, gl.RGBA, int32(image.Width), int32(image.Height), 0, gl.RGBA, gl.UNSIGNED_BYTE, image.Pixels)
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// Restore state
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gl.BindTexture(gl.TEXTURE_2D, uint32(lastTexture))
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// Store texture identifier
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io.Fonts().SetTextureID(imgui.TextureID(c.fontTexture))
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return c, nil
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}
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func (c *Context) SetDisplaySize(displaySize math.Vec2i) {
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c.displaySize = displaySize
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}
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func (c *Context) SetBufferSize(bufferSize math.Vec2i) {
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c.bufferSize = bufferSize
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}
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func (c *Context) Destroy() error {
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if c == nil || c.fontTexture == 0 {
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return nil
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}
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gl.DeleteTextures(1, &c.fontTexture)
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imgui.CurrentIO().Fonts().SetTextureID(0)
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c.fontTexture = 0
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singleton.refCount--
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if singleton.refCount == 0 {
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singleton.context.Destroy()
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singleton.context = nil
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}
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return nil
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}
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