forked from joejulian/gio
Elias Naur
501 lines
13 KiB
Go
501 lines
13 KiB
Go
// SPDX-License-Identifier: Unlicense OR MIT
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// GLFW doesn't build on OpenBSD and FreeBSD.
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// +build !openbsd,!freebsd,!windows,!android,!ios,!js
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// The glfw example demonstrates integration of Gio into a foreign
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// windowing and rendering library, in this case GLFW
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// (https://www.glfw.org).
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//
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// See the go-glfw package for installation of the native
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// dependencies:
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//
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// https://github.com/go-gl/glfw
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package main
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import (
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"image"
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"log"
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"math"
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"runtime"
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"strings"
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"time"
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"unsafe"
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"gioui.org/f32"
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"gioui.org/font/gofont"
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"gioui.org/gpu"
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giogl "gioui.org/gpu/gl"
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"gioui.org/io/pointer"
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"gioui.org/io/router"
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"gioui.org/layout"
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"gioui.org/op"
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"gioui.org/unit"
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"gioui.org/widget"
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"gioui.org/widget/material"
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"github.com/go-gl/gl/v3.3-core/gl"
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"github.com/go-gl/glfw/v3.3/glfw"
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)
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type glfwConfig struct {
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Scale float32
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}
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type goglFunctions struct {
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}
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func main() {
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// Required by the OpenGL threading model.
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runtime.LockOSThread()
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err := glfw.Init()
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if err != nil {
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log.Fatal(err)
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}
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defer glfw.Terminate()
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// Gio assumes a sRGB backbuffer.
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glfw.WindowHint(glfw.SRGBCapable, glfw.True)
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window, err := glfw.CreateWindow(800, 600, "Gio + GLFW", nil, nil)
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if err != nil {
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log.Fatal(err)
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}
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window.MakeContextCurrent()
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if err := gl.Init(); err != nil {
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log.Fatal(err)
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}
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// Enable sRGB.
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gl.Enable(gl.FRAMEBUFFER_SRGB)
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f := new(goglFunctions)
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var queue router.Router
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var ops op.Ops
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th := material.NewTheme(gofont.Collection())
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backend, err := giogl.NewBackend(f)
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if err != nil {
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log.Fatal(err)
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}
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gpu, err := gpu.New(backend)
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if err != nil {
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log.Fatal(err)
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}
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registerCallbacks(window, &queue)
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for !window.ShouldClose() {
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glfw.PollEvents()
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scale := float32(1.0)
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if monitor := window.GetMonitor(); monitor != nil {
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scalex, _ := window.GetMonitor().GetContentScale()
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scale = scalex
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}
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width, height := window.GetSize()
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sz := image.Point{X: width, Y: height}
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ops.Reset()
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gtx := layout.Context{
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Ops: &ops,
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Now: time.Now(),
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Queue: &queue,
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Metric: unit.Metric{
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PxPerDp: scale,
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PxPerSp: scale,
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},
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Constraints: layout.Exact(sz),
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}
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draw(gtx, th)
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gpu.Collect(sz, gtx.Ops)
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gpu.BeginFrame()
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queue.Frame(gtx.Ops)
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gpu.EndFrame()
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window.SwapBuffers()
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}
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}
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var button widget.Clickable
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func draw(gtx layout.Context, th *material.Theme) layout.Dimensions {
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return layout.Center.Layout(gtx,
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material.Button(th, &button, "Button").Layout,
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)
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}
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func registerCallbacks(window *glfw.Window, q *router.Router) {
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var btns pointer.Buttons
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beginning := time.Now()
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var lastPos f32.Point
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window.SetCursorPosCallback(func(w *glfw.Window, xpos float64, ypos float64) {
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lastPos = f32.Point{X: float32(xpos), Y: float32(ypos)}
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q.Add(pointer.Event{
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Type: pointer.Move,
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Position: lastPos,
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Source: pointer.Mouse,
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Time: time.Since(beginning),
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Buttons: btns,
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})
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})
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window.SetMouseButtonCallback(func(w *glfw.Window, button glfw.MouseButton, action glfw.Action, mods glfw.ModifierKey) {
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var btn pointer.Buttons
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switch button {
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case glfw.MouseButton1:
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btn = pointer.ButtonLeft
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case glfw.MouseButton2:
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btn = pointer.ButtonRight
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case glfw.MouseButton3:
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btn = pointer.ButtonMiddle
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}
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var typ pointer.Type
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switch action {
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case glfw.Release:
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typ = pointer.Release
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btns &^= btn
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case glfw.Press:
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typ = pointer.Press
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btns |= btn
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}
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q.Add(pointer.Event{
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Type: typ,
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Source: pointer.Mouse,
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Time: time.Since(beginning),
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Position: lastPos,
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Buttons: btns,
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})
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})
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}
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func (s *glfwConfig) Px(v unit.Value) int {
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scale := s.Scale
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if v.U == unit.UnitPx {
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scale = 1
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}
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return int(math.Round(float64(scale * v.V)))
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}
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func (f *goglFunctions) ActiveTexture(texture giogl.Enum) {
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gl.ActiveTexture(uint32(texture))
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}
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func (f *goglFunctions) AttachShader(p giogl.Program, s giogl.Shader) {
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gl.AttachShader(uint32(p.V), uint32(s.V))
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}
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func (f *goglFunctions) BeginQuery(target giogl.Enum, query giogl.Query) {
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gl.BeginQuery(uint32(target), uint32(query.V))
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}
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func (f *goglFunctions) BindAttribLocation(p giogl.Program, a giogl.Attrib, name string) {
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gl.BindAttribLocation(uint32(p.V), uint32(a), gl.Str(name+"\x00"))
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}
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func (f *goglFunctions) BindBuffer(target giogl.Enum, b giogl.Buffer) {
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gl.BindBuffer(uint32(target), uint32(b.V))
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}
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func (f *goglFunctions) BindBufferBase(target giogl.Enum, index int, b giogl.Buffer) {
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gl.BindBufferBase(uint32(target), uint32(index), uint32(b.V))
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}
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func (f *goglFunctions) BindFramebuffer(target giogl.Enum, fb giogl.Framebuffer) {
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gl.BindFramebuffer(uint32(target), uint32(fb.V))
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}
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func (f *goglFunctions) BindRenderbuffer(target giogl.Enum, rb giogl.Renderbuffer) {
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gl.BindRenderbuffer(uint32(target), uint32(rb.V))
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}
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func (f *goglFunctions) BindTexture(target giogl.Enum, t giogl.Texture) {
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gl.BindTexture(uint32(target), uint32(t.V))
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}
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func (f *goglFunctions) BlendEquation(mode giogl.Enum) {
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gl.BlendEquation(uint32(mode))
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}
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func (f *goglFunctions) BlendFunc(sfactor, dfactor giogl.Enum) {
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gl.BlendFunc(uint32(sfactor), uint32(dfactor))
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}
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func (f *goglFunctions) BufferData(target giogl.Enum, src []byte, usage giogl.Enum) {
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gl.BufferData(uint32(target), len(src), gl.Ptr(src), uint32(usage))
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}
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func (f *goglFunctions) CheckFramebufferStatus(target giogl.Enum) giogl.Enum {
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return giogl.Enum(gl.CheckFramebufferStatus(uint32(target)))
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}
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func (f *goglFunctions) Clear(mask giogl.Enum) {
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gl.Clear(uint32(mask))
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}
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func (f *goglFunctions) ClearColor(red, green, blue, alpha float32) {
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gl.ClearColor(red, green, blue, alpha)
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}
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func (f *goglFunctions) ClearDepthf(d float32) {
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gl.ClearDepthf(d)
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}
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func (f *goglFunctions) CompileShader(s giogl.Shader) {
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gl.CompileShader(uint32(s.V))
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}
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func (f *goglFunctions) CreateBuffer() giogl.Buffer {
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var buf uint32
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gl.GenBuffers(1, &buf)
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return giogl.Buffer{uint(buf)}
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}
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func (f *goglFunctions) CreateFramebuffer() giogl.Framebuffer {
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var fb uint32
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gl.GenFramebuffers(1, &fb)
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return giogl.Framebuffer{uint(fb)}
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}
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func (f *goglFunctions) CreateProgram() giogl.Program {
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return giogl.Program{uint(gl.CreateProgram())}
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}
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func (f *goglFunctions) CreateQuery() giogl.Query {
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var q uint32
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gl.GenQueries(1, &q)
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return giogl.Query{uint(q)}
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}
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func (f *goglFunctions) CreateRenderbuffer() giogl.Renderbuffer {
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var rb uint32
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gl.GenRenderbuffers(1, &rb)
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return giogl.Renderbuffer{uint(rb)}
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}
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func (f *goglFunctions) CreateShader(ty giogl.Enum) giogl.Shader {
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return giogl.Shader{uint(gl.CreateShader(uint32(ty)))}
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}
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func (f *goglFunctions) CreateTexture() giogl.Texture {
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var t uint32
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gl.GenTextures(1, &t)
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return giogl.Texture{uint(t)}
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}
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func (f *goglFunctions) DeleteBuffer(v giogl.Buffer) {
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buf := uint32(v.V)
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gl.DeleteBuffers(1, &buf)
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}
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func (f *goglFunctions) DeleteFramebuffer(v giogl.Framebuffer) {
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fb := uint32(v.V)
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gl.DeleteFramebuffers(1, &fb)
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}
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func (f *goglFunctions) DeleteProgram(p giogl.Program) {
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gl.DeleteProgram(uint32(p.V))
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}
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func (f *goglFunctions) DeleteQuery(query giogl.Query) {
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q := uint32(query.V)
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gl.DeleteQueries(1, &q)
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}
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func (f *goglFunctions) DeleteRenderbuffer(rb giogl.Renderbuffer) {
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r := uint32(rb.V)
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gl.DeleteRenderbuffers(1, &r)
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}
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func (f *goglFunctions) DeleteShader(s giogl.Shader) {
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gl.DeleteShader(uint32(s.V))
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}
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func (f *goglFunctions) DeleteTexture(v giogl.Texture) {
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t := uint32(v.V)
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gl.DeleteTextures(1, &t)
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}
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func (f *goglFunctions) DepthFunc(d giogl.Enum) {
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gl.DepthFunc(uint32(d))
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}
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func (f *goglFunctions) DepthMask(mask bool) {
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gl.DepthMask(mask)
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}
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func (f *goglFunctions) DisableVertexAttribArray(a giogl.Attrib) {
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gl.DisableVertexAttribArray(uint32(a))
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}
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func (f *goglFunctions) Disable(cap giogl.Enum) {
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gl.Disable(uint32(cap))
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}
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func (f *goglFunctions) DrawArrays(mode giogl.Enum, first, count int) {
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gl.DrawArrays(uint32(mode), int32(first), int32(count))
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}
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func (f *goglFunctions) DrawElements(mode giogl.Enum, count int, ty giogl.Enum, offset int) {
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gl.DrawElements(uint32(mode), int32(count), uint32(ty), unsafe.Pointer(uintptr(offset)))
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}
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func (f *goglFunctions) Enable(cap giogl.Enum) {
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gl.Enable(uint32(cap))
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}
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func (f *goglFunctions) EnableVertexAttribArray(a giogl.Attrib) {
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gl.EnableVertexAttribArray(uint32(a))
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}
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func (f *goglFunctions) EndQuery(target giogl.Enum) {
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gl.EndQuery(uint32(target))
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}
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func (f *goglFunctions) FramebufferRenderbuffer(target, attachment, renderbuffertarget giogl.Enum, renderbuffer giogl.Renderbuffer) {
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gl.FramebufferRenderbuffer(uint32(target), uint32(attachment), uint32(renderbuffertarget), uint32(renderbuffer.V))
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}
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func (f *goglFunctions) FramebufferTexture2D(target, attachment, texTarget giogl.Enum, t giogl.Texture, level int) {
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gl.FramebufferTexture2D(uint32(target), uint32(attachment), uint32(texTarget), uint32(t.V), int32(level))
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}
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func (f *goglFunctions) GetBinding(pname giogl.Enum) giogl.Object {
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var o int32
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gl.GetIntegerv(uint32(pname), &o)
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return giogl.Object{uint(o)}
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}
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func (f *goglFunctions) GetError() giogl.Enum {
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return giogl.Enum(gl.GetError())
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}
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func (f *goglFunctions) GetInteger(pname giogl.Enum) int {
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var p [100]int32
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gl.GetIntegerv(uint32(pname), &p[0])
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return int(p[0])
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}
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func (f *goglFunctions) GetProgrami(p giogl.Program, pname giogl.Enum) int {
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var params [100]int32
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gl.GetProgramiv(uint32(p.V), uint32(pname), ¶ms[0])
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return int(params[0])
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}
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func (f *goglFunctions) GetProgramInfoLog(p giogl.Program) string {
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var logLength int32
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gl.GetProgramiv(uint32(p.V), gl.INFO_LOG_LENGTH, &logLength)
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log := strings.Repeat("\x00", int(logLength+1))
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gl.GetProgramInfoLog(uint32(p.V), logLength, nil, gl.Str(log))
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return log[:logLength]
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}
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func (f *goglFunctions) GetQueryObjectuiv(query giogl.Query, pname giogl.Enum) uint {
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var i uint32
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gl.GetQueryObjectuiv(uint32(query.V), uint32(pname), &i)
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return uint(i)
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}
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func (f *goglFunctions) GetShaderi(s giogl.Shader, pname giogl.Enum) int {
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var i int32
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gl.GetShaderiv(uint32(s.V), uint32(pname), &i)
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return int(i)
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}
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func (f *goglFunctions) GetShaderInfoLog(s giogl.Shader) string {
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var logLength int32
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gl.GetShaderiv(uint32(s.V), gl.INFO_LOG_LENGTH, &logLength)
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log := strings.Repeat("\x00", int(logLength+1))
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gl.GetShaderInfoLog(uint32(s.V), logLength, nil, gl.Str(log))
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return log[:logLength]
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}
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func (f *goglFunctions) GetString(pname giogl.Enum) string {
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switch {
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case pname == giogl.EXTENSIONS:
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// OpenGL 3 core profile doesn't support glGetString(GL_EXTENSIONS).
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// Use glGetStringi(GL_EXTENSIONS, <index>).
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var exts []string
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nexts := f.GetInteger(gl.NUM_EXTENSIONS)
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for i := 0; i < nexts; i++ {
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ext := gl.GetStringi(gl.EXTENSIONS, uint32(i))
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exts = append(exts, gl.GoStr(ext))
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}
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return strings.Join(exts, " ")
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default:
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return gl.GoStr(gl.GetString(uint32(pname)))
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}
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}
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func (f *goglFunctions) GetUniformBlockIndex(p giogl.Program, name string) uint {
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return uint(gl.GetUniformBlockIndex(uint32(p.V), gl.Str(name+"\x00")))
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}
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func (f *goglFunctions) GetUniformLocation(p giogl.Program, name string) giogl.Uniform {
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return giogl.Uniform{int(gl.GetUniformLocation(uint32(p.V), gl.Str(name+"\x00")))}
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}
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func (f *goglFunctions) InvalidateFramebuffer(target, attachment giogl.Enum) {
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// Doesn't exist in OpenGL Core.
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}
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func (f *goglFunctions) LinkProgram(p giogl.Program) {
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gl.LinkProgram(uint32(p.V))
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}
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func (f *goglFunctions) ReadPixels(x, y, width, height int, format, ty giogl.Enum, data []byte) {
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gl.ReadPixels(int32(x), int32(y), int32(width), int32(height), uint32(format), uint32(ty), unsafe.Pointer(&data[0]))
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}
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func (f *goglFunctions) RenderbufferStorage(target, internalformat giogl.Enum, width, height int) {
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gl.RenderbufferStorage(uint32(target), uint32(internalformat), int32(width), int32(height))
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}
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func (f *goglFunctions) ShaderSource(s giogl.Shader, src string) {
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csources, free := gl.Strs(src + "\x00")
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gl.ShaderSource(uint32(s.V), 1, csources, nil)
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free()
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}
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func (f *goglFunctions) TexImage2D(target giogl.Enum, level int, internalFormat int, width, height int, format, ty giogl.Enum, data []byte) {
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var p unsafe.Pointer
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if len(data) > 0 {
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p = unsafe.Pointer(&data[0])
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}
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gl.TexImage2D(uint32(target), int32(level), int32(internalFormat), int32(width), int32(height), 0, uint32(format), uint32(ty), p)
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}
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func (f *goglFunctions) TexParameteri(target, pname giogl.Enum, param int) {
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gl.TexParameteri(uint32(target), uint32(pname), int32(param))
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}
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func (f *goglFunctions) Uniform1f(dst giogl.Uniform, v float32) {
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gl.Uniform1f(int32(dst.V), v)
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}
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func (f *goglFunctions) UniformBlockBinding(p giogl.Program, uniformBlockIndex uint, uniformBlockBinding uint) {
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gl.UniformBlockBinding(uint32(p.V), uint32(uniformBlockIndex), uint32(uniformBlockBinding))
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}
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func (f *goglFunctions) Uniform1i(dst giogl.Uniform, v int) {
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gl.Uniform1i(int32(dst.V), int32(v))
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}
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func (f *goglFunctions) Uniform2f(dst giogl.Uniform, v0, v1 float32) {
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gl.Uniform2f(int32(dst.V), v0, v1)
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}
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func (f *goglFunctions) Uniform3f(dst giogl.Uniform, v0, v1, v2 float32) {
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gl.Uniform3f(int32(dst.V), v0, v1, v2)
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}
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func (f *goglFunctions) Uniform4f(dst giogl.Uniform, v0, v1, v2, v3 float32) {
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gl.Uniform4f(int32(dst.V), v0, v1, v2, v3)
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}
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func (f *goglFunctions) UseProgram(p giogl.Program) {
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gl.UseProgram(uint32(p.V))
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}
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func (f *goglFunctions) VertexAttribPointer(dst giogl.Attrib, size int, ty giogl.Enum, normalized bool, stride, offset int) {
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gl.VertexAttribPointer(uint32(dst), int32(size), uint32(ty), normalized, int32(stride), unsafe.Pointer(uintptr(offset)))
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}
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|
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func (f *goglFunctions) Viewport(x, y, width, height int) {
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gl.Viewport(int32(x), int32(y), int32(width), int32(height))
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|
}
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