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internal/egl: move app/internal/egl
We're about to move package app/headless to gpu/headless, and it needs the egl package. Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
@@ -0,0 +1,287 @@
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// SPDX-License-Identifier: Unlicense OR MIT
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// +build linux windows freebsd openbsd
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package egl
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import (
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"errors"
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"fmt"
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"runtime"
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"strings"
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"gioui.org/gpu"
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"gioui.org/internal/glimpl"
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"gioui.org/internal/srgb"
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)
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type Context struct {
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c *glimpl.Functions
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disp _EGLDisplay
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eglCtx *eglContext
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eglSurf _EGLSurface
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width, height int
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refreshFBO bool
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// For sRGB emulation.
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srgbFBO *srgb.FBO
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}
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type eglContext struct {
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config _EGLConfig
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ctx _EGLContext
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visualID int
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srgb bool
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surfaceless bool
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}
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var (
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nilEGLDisplay _EGLDisplay
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nilEGLSurface _EGLSurface
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nilEGLContext _EGLContext
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nilEGLConfig _EGLConfig
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EGL_DEFAULT_DISPLAY NativeDisplayType
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)
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const (
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_EGL_ALPHA_SIZE = 0x3021
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_EGL_BLUE_SIZE = 0x3022
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_EGL_CONFIG_CAVEAT = 0x3027
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_EGL_CONTEXT_CLIENT_VERSION = 0x3098
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_EGL_DEPTH_SIZE = 0x3025
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_EGL_GL_COLORSPACE_KHR = 0x309d
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_EGL_GL_COLORSPACE_SRGB_KHR = 0x3089
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_EGL_GREEN_SIZE = 0x3023
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_EGL_EXTENSIONS = 0x3055
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_EGL_NATIVE_VISUAL_ID = 0x302e
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_EGL_NONE = 0x3038
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_EGL_OPENGL_ES2_BIT = 0x4
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_EGL_RED_SIZE = 0x3024
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_EGL_RENDERABLE_TYPE = 0x3040
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_EGL_SURFACE_TYPE = 0x3033
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_EGL_WINDOW_BIT = 0x4
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)
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func (c *Context) Release() {
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if c.srgbFBO != nil {
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c.srgbFBO.Release()
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c.srgbFBO = nil
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}
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c.ReleaseSurface()
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if c.eglCtx != nil {
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eglDestroyContext(c.disp, c.eglCtx.ctx)
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c.eglCtx = nil
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}
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c.disp = nilEGLDisplay
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}
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func (c *Context) Present() error {
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if c.srgbFBO != nil {
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c.srgbFBO.Blit()
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}
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if !eglSwapBuffers(c.disp, c.eglSurf) {
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return fmt.Errorf("eglSwapBuffers failed (%x)", eglGetError())
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}
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if c.srgbFBO != nil {
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c.srgbFBO.AfterPresent()
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}
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return nil
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}
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func NewContext(disp NativeDisplayType) (*Context, error) {
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if err := loadEGL(); err != nil {
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return nil, err
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}
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eglDisp := eglGetDisplay(disp)
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// eglGetDisplay can return EGL_NO_DISPLAY yet no error
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// (EGL_SUCCESS), in which case a default EGL display might be
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// available.
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if eglDisp == nilEGLDisplay {
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eglDisp = eglGetDisplay(EGL_DEFAULT_DISPLAY)
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}
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if eglDisp == nilEGLDisplay {
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return nil, fmt.Errorf("eglGetDisplay failed: 0x%x", eglGetError())
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}
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eglCtx, err := createContext(eglDisp)
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if err != nil {
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return nil, err
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}
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f, err := glimpl.NewFunctions(nil)
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if err != nil {
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return nil, err
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}
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c := &Context{
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disp: eglDisp,
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eglCtx: eglCtx,
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c: f,
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}
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return c, nil
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}
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func (c *Context) API() gpu.API {
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return gpu.OpenGL{}
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}
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func (c *Context) ReleaseSurface() {
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if c.eglSurf == nilEGLSurface {
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return
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}
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// Make sure any in-flight GL commands are complete.
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c.c.Finish()
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c.ReleaseCurrent()
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eglDestroySurface(c.disp, c.eglSurf)
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c.eglSurf = nilEGLSurface
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}
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func (c *Context) VisualID() int {
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return c.eglCtx.visualID
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}
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func (c *Context) CreateSurface(win NativeWindowType, width, height int) error {
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eglSurf, err := createSurface(c.disp, c.eglCtx, win)
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c.eglSurf = eglSurf
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c.width = width
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c.height = height
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c.refreshFBO = true
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return err
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}
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func (c *Context) ReleaseCurrent() {
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if c.disp != nilEGLDisplay {
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eglMakeCurrent(c.disp, nilEGLSurface, nilEGLSurface, nilEGLContext)
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}
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}
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func (c *Context) MakeCurrent() error {
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if c.eglSurf == nilEGLSurface && !c.eglCtx.surfaceless {
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return errors.New("no surface created yet EGL_KHR_surfaceless_context is not supported")
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}
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if !eglMakeCurrent(c.disp, c.eglSurf, c.eglSurf, c.eglCtx.ctx) {
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return fmt.Errorf("eglMakeCurrent error 0x%x", eglGetError())
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}
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if c.eglCtx.srgb || c.eglSurf == nilEGLSurface {
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return nil
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}
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if c.srgbFBO == nil {
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var err error
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c.srgbFBO, err = srgb.New(nil)
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if err != nil {
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c.ReleaseCurrent()
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return err
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}
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}
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if c.refreshFBO {
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c.refreshFBO = false
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if err := c.srgbFBO.Refresh(c.width, c.height); err != nil {
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c.ReleaseCurrent()
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return err
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}
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}
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return nil
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}
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func (c *Context) EnableVSync(enable bool) {
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if enable {
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eglSwapInterval(c.disp, 1)
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} else {
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eglSwapInterval(c.disp, 0)
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}
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}
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func hasExtension(exts []string, ext string) bool {
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for _, e := range exts {
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if ext == e {
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return true
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}
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}
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return false
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}
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func createContext(disp _EGLDisplay) (*eglContext, error) {
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major, minor, ret := eglInitialize(disp)
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if !ret {
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return nil, fmt.Errorf("eglInitialize failed: 0x%x", eglGetError())
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}
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// sRGB framebuffer support on EGL 1.5 or if EGL_KHR_gl_colorspace is supported.
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exts := strings.Split(eglQueryString(disp, _EGL_EXTENSIONS), " ")
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srgb := major > 1 || minor >= 5 || hasExtension(exts, "EGL_KHR_gl_colorspace")
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attribs := []_EGLint{
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_EGL_RENDERABLE_TYPE, _EGL_OPENGL_ES2_BIT,
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_EGL_SURFACE_TYPE, _EGL_WINDOW_BIT,
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_EGL_BLUE_SIZE, 8,
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_EGL_GREEN_SIZE, 8,
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_EGL_RED_SIZE, 8,
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_EGL_CONFIG_CAVEAT, _EGL_NONE,
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}
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if srgb {
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if runtime.GOOS == "linux" || runtime.GOOS == "android" {
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// Some Mesa drivers crash if an sRGB framebuffer is requested without alpha.
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// https://bugs.freedesktop.org/show_bug.cgi?id=107782.
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//
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// Also, some Android devices (Samsung S9) needs alpha for sRGB to work.
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attribs = append(attribs, _EGL_ALPHA_SIZE, 8)
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}
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// Only request a depth buffer if we're going to render directly to the framebuffer.
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attribs = append(attribs, _EGL_DEPTH_SIZE, 16)
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}
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attribs = append(attribs, _EGL_NONE)
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eglCfg, ret := eglChooseConfig(disp, attribs)
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if !ret {
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return nil, fmt.Errorf("eglChooseConfig failed: 0x%x", eglGetError())
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}
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if eglCfg == nilEGLConfig {
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supportsNoCfg := hasExtension(exts, "EGL_KHR_no_config_context")
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if !supportsNoCfg {
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return nil, errors.New("eglChooseConfig returned no configs")
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}
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}
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var visID _EGLint
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if eglCfg != nilEGLConfig {
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var ok bool
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visID, ok = eglGetConfigAttrib(disp, eglCfg, _EGL_NATIVE_VISUAL_ID)
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if !ok {
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return nil, errors.New("newContext: eglGetConfigAttrib for _EGL_NATIVE_VISUAL_ID failed")
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}
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}
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ctxAttribs := []_EGLint{
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_EGL_CONTEXT_CLIENT_VERSION, 3,
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_EGL_NONE,
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}
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eglCtx := eglCreateContext(disp, eglCfg, nilEGLContext, ctxAttribs)
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if eglCtx == nilEGLContext {
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// Fall back to OpenGL ES 2 and rely on extensions.
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ctxAttribs := []_EGLint{
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_EGL_CONTEXT_CLIENT_VERSION, 2,
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_EGL_NONE,
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}
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eglCtx = eglCreateContext(disp, eglCfg, nilEGLContext, ctxAttribs)
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if eglCtx == nilEGLContext {
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return nil, fmt.Errorf("eglCreateContext failed: 0x%x", eglGetError())
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}
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}
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return &eglContext{
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config: _EGLConfig(eglCfg),
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ctx: _EGLContext(eglCtx),
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visualID: int(visID),
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srgb: srgb,
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surfaceless: hasExtension(exts, "EGL_KHR_surfaceless_context"),
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}, nil
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}
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func createSurface(disp _EGLDisplay, eglCtx *eglContext, win NativeWindowType) (_EGLSurface, error) {
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var surfAttribs []_EGLint
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if eglCtx.srgb {
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surfAttribs = append(surfAttribs, _EGL_GL_COLORSPACE_KHR, _EGL_GL_COLORSPACE_SRGB_KHR)
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}
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surfAttribs = append(surfAttribs, _EGL_NONE)
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eglSurf := eglCreateWindowSurface(disp, eglCtx.config, win, surfAttribs)
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if eglSurf == nilEGLSurface && eglCtx.srgb {
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// Try again without sRGB
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eglCtx.srgb = false
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surfAttribs = []_EGLint{_EGL_NONE}
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eglSurf = eglCreateWindowSurface(disp, eglCtx.config, win, surfAttribs)
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}
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if eglSurf == nilEGLSurface {
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return nilEGLSurface, fmt.Errorf("newContext: eglCreateWindowSurface failed 0x%x (sRGB=%v)", eglGetError(), eglCtx.srgb)
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}
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return eglSurf, nil
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}
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@@ -0,0 +1,104 @@
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// SPDX-License-Identifier: Unlicense OR MIT
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// +build linux freebsd openbsd
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package egl
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/*
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#cgo linux,!android pkg-config: egl
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#cgo freebsd openbsd android LDFLAGS: -lEGL
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#cgo freebsd CFLAGS: -I/usr/local/include
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#cgo freebsd LDFLAGS: -L/usr/local/lib
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#cgo openbsd CFLAGS: -I/usr/X11R6/include
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#cgo openbsd LDFLAGS: -L/usr/X11R6/lib
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#cgo CFLAGS: -DEGL_NO_X11
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#include <EGL/egl.h>
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#include <EGL/eglext.h>
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*/
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import "C"
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type (
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_EGLint = C.EGLint
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_EGLDisplay = C.EGLDisplay
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_EGLConfig = C.EGLConfig
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_EGLContext = C.EGLContext
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_EGLSurface = C.EGLSurface
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NativeDisplayType = C.EGLNativeDisplayType
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NativeWindowType = C.EGLNativeWindowType
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)
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func loadEGL() error {
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return nil
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}
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func eglChooseConfig(disp _EGLDisplay, attribs []_EGLint) (_EGLConfig, bool) {
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var cfg C.EGLConfig
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var ncfg C.EGLint
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if C.eglChooseConfig(disp, &attribs[0], &cfg, 1, &ncfg) != C.EGL_TRUE {
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return nilEGLConfig, false
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}
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return _EGLConfig(cfg), true
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}
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func eglCreateContext(disp _EGLDisplay, cfg _EGLConfig, shareCtx _EGLContext, attribs []_EGLint) _EGLContext {
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ctx := C.eglCreateContext(disp, cfg, shareCtx, &attribs[0])
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return _EGLContext(ctx)
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}
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func eglDestroySurface(disp _EGLDisplay, surf _EGLSurface) bool {
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return C.eglDestroySurface(disp, surf) == C.EGL_TRUE
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}
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func eglDestroyContext(disp _EGLDisplay, ctx _EGLContext) bool {
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return C.eglDestroyContext(disp, ctx) == C.EGL_TRUE
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}
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func eglGetConfigAttrib(disp _EGLDisplay, cfg _EGLConfig, attr _EGLint) (_EGLint, bool) {
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var val _EGLint
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ret := C.eglGetConfigAttrib(disp, cfg, attr, &val)
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return val, ret == C.EGL_TRUE
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}
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func eglGetError() _EGLint {
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return C.eglGetError()
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}
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func eglInitialize(disp _EGLDisplay) (_EGLint, _EGLint, bool) {
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var maj, min _EGLint
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ret := C.eglInitialize(disp, &maj, &min)
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return maj, min, ret == C.EGL_TRUE
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}
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func eglMakeCurrent(disp _EGLDisplay, draw, read _EGLSurface, ctx _EGLContext) bool {
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return C.eglMakeCurrent(disp, draw, read, ctx) == C.EGL_TRUE
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}
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func eglReleaseThread() bool {
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return C.eglReleaseThread() == C.EGL_TRUE
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}
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func eglSwapBuffers(disp _EGLDisplay, surf _EGLSurface) bool {
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return C.eglSwapBuffers(disp, surf) == C.EGL_TRUE
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}
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func eglSwapInterval(disp _EGLDisplay, interval _EGLint) bool {
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return C.eglSwapInterval(disp, interval) == C.EGL_TRUE
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}
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func eglTerminate(disp _EGLDisplay) bool {
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return C.eglTerminate(disp) == C.EGL_TRUE
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}
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func eglQueryString(disp _EGLDisplay, name _EGLint) string {
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return C.GoString(C.eglQueryString(disp, name))
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}
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func eglGetDisplay(disp NativeDisplayType) _EGLDisplay {
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return C.eglGetDisplay(disp)
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}
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func eglCreateWindowSurface(disp _EGLDisplay, conf _EGLConfig, win NativeWindowType, attribs []_EGLint) _EGLSurface {
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eglSurf := C.eglCreateWindowSurface(disp, conf, win, &attribs[0])
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return eglSurf
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}
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@@ -0,0 +1,164 @@
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// SPDX-License-Identifier: Unlicense OR MIT
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package egl
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import (
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"fmt"
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"runtime"
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"sync"
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"unsafe"
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syscall "golang.org/x/sys/windows"
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"gioui.org/internal/glimpl"
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gunsafe "gioui.org/internal/unsafe"
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)
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type (
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_EGLint int32
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_EGLDisplay uintptr
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_EGLConfig uintptr
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_EGLContext uintptr
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_EGLSurface uintptr
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NativeDisplayType uintptr
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NativeWindowType uintptr
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)
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var (
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libEGL = syscall.NewLazyDLL("libEGL.dll")
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_eglChooseConfig = libEGL.NewProc("eglChooseConfig")
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_eglCreateContext = libEGL.NewProc("eglCreateContext")
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_eglCreateWindowSurface = libEGL.NewProc("eglCreateWindowSurface")
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_eglDestroyContext = libEGL.NewProc("eglDestroyContext")
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_eglDestroySurface = libEGL.NewProc("eglDestroySurface")
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_eglGetConfigAttrib = libEGL.NewProc("eglGetConfigAttrib")
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_eglGetDisplay = libEGL.NewProc("eglGetDisplay")
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_eglGetError = libEGL.NewProc("eglGetError")
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_eglInitialize = libEGL.NewProc("eglInitialize")
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_eglMakeCurrent = libEGL.NewProc("eglMakeCurrent")
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_eglReleaseThread = libEGL.NewProc("eglReleaseThread")
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_eglSwapInterval = libEGL.NewProc("eglSwapInterval")
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_eglSwapBuffers = libEGL.NewProc("eglSwapBuffers")
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_eglTerminate = libEGL.NewProc("eglTerminate")
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_eglQueryString = libEGL.NewProc("eglQueryString")
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)
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var loadOnce sync.Once
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func loadEGL() error {
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var err error
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loadOnce.Do(func() {
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err = loadDLLs()
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})
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return err
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}
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func loadDLLs() error {
|
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if err := loadDLL(libEGL, "libEGL.dll"); err != nil {
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return err
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}
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if err := loadDLL(glimpl.LibGLESv2, "libGLESv2.dll"); err != nil {
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return err
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}
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// d3dcompiler_47.dll is needed internally for shader compilation to function.
|
||||
return loadDLL(syscall.NewLazyDLL("d3dcompiler_47.dll"), "d3dcompiler_47.dll")
|
||||
}
|
||||
|
||||
func loadDLL(dll *syscall.LazyDLL, name string) error {
|
||||
err := dll.Load()
|
||||
if err != nil {
|
||||
return fmt.Errorf("egl: failed to load %s: %v", name, err)
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func eglChooseConfig(disp _EGLDisplay, attribs []_EGLint) (_EGLConfig, bool) {
|
||||
var cfg _EGLConfig
|
||||
var ncfg _EGLint
|
||||
a := &attribs[0]
|
||||
r, _, _ := _eglChooseConfig.Call(uintptr(disp), uintptr(unsafe.Pointer(a)), uintptr(unsafe.Pointer(&cfg)), 1, uintptr(unsafe.Pointer(&ncfg)))
|
||||
issue34474KeepAlive(a)
|
||||
return cfg, r != 0
|
||||
}
|
||||
|
||||
func eglCreateContext(disp _EGLDisplay, cfg _EGLConfig, shareCtx _EGLContext, attribs []_EGLint) _EGLContext {
|
||||
a := &attribs[0]
|
||||
c, _, _ := _eglCreateContext.Call(uintptr(disp), uintptr(cfg), uintptr(shareCtx), uintptr(unsafe.Pointer(a)))
|
||||
issue34474KeepAlive(a)
|
||||
return _EGLContext(c)
|
||||
}
|
||||
|
||||
func eglCreateWindowSurface(disp _EGLDisplay, cfg _EGLConfig, win NativeWindowType, attribs []_EGLint) _EGLSurface {
|
||||
a := &attribs[0]
|
||||
s, _, _ := _eglCreateWindowSurface.Call(uintptr(disp), uintptr(cfg), uintptr(win), uintptr(unsafe.Pointer(a)))
|
||||
issue34474KeepAlive(a)
|
||||
return _EGLSurface(s)
|
||||
}
|
||||
|
||||
func eglDestroySurface(disp _EGLDisplay, surf _EGLSurface) bool {
|
||||
r, _, _ := _eglDestroySurface.Call(uintptr(disp), uintptr(surf))
|
||||
return r != 0
|
||||
}
|
||||
|
||||
func eglDestroyContext(disp _EGLDisplay, ctx _EGLContext) bool {
|
||||
r, _, _ := _eglDestroyContext.Call(uintptr(disp), uintptr(ctx))
|
||||
return r != 0
|
||||
}
|
||||
|
||||
func eglGetConfigAttrib(disp _EGLDisplay, cfg _EGLConfig, attr _EGLint) (_EGLint, bool) {
|
||||
var val uintptr
|
||||
r, _, _ := _eglGetConfigAttrib.Call(uintptr(disp), uintptr(cfg), uintptr(attr), uintptr(unsafe.Pointer(&val)))
|
||||
return _EGLint(val), r != 0
|
||||
}
|
||||
|
||||
func eglGetDisplay(disp NativeDisplayType) _EGLDisplay {
|
||||
d, _, _ := _eglGetDisplay.Call(uintptr(disp))
|
||||
return _EGLDisplay(d)
|
||||
}
|
||||
|
||||
func eglGetError() _EGLint {
|
||||
e, _, _ := _eglGetError.Call()
|
||||
return _EGLint(e)
|
||||
}
|
||||
|
||||
func eglInitialize(disp _EGLDisplay) (_EGLint, _EGLint, bool) {
|
||||
var maj, min uintptr
|
||||
r, _, _ := _eglInitialize.Call(uintptr(disp), uintptr(unsafe.Pointer(&maj)), uintptr(unsafe.Pointer(&min)))
|
||||
return _EGLint(maj), _EGLint(min), r != 0
|
||||
}
|
||||
|
||||
func eglMakeCurrent(disp _EGLDisplay, draw, read _EGLSurface, ctx _EGLContext) bool {
|
||||
r, _, _ := _eglMakeCurrent.Call(uintptr(disp), uintptr(draw), uintptr(read), uintptr(ctx))
|
||||
return r != 0
|
||||
}
|
||||
|
||||
func eglReleaseThread() bool {
|
||||
r, _, _ := _eglReleaseThread.Call()
|
||||
return r != 0
|
||||
}
|
||||
|
||||
func eglSwapInterval(disp _EGLDisplay, interval _EGLint) bool {
|
||||
r, _, _ := _eglSwapInterval.Call(uintptr(disp), uintptr(interval))
|
||||
return r != 0
|
||||
}
|
||||
|
||||
func eglSwapBuffers(disp _EGLDisplay, surf _EGLSurface) bool {
|
||||
r, _, _ := _eglSwapBuffers.Call(uintptr(disp), uintptr(surf))
|
||||
return r != 0
|
||||
}
|
||||
|
||||
func eglTerminate(disp _EGLDisplay) bool {
|
||||
r, _, _ := _eglTerminate.Call(uintptr(disp))
|
||||
return r != 0
|
||||
}
|
||||
|
||||
func eglQueryString(disp _EGLDisplay, name _EGLint) string {
|
||||
r, _, _ := _eglQueryString.Call(uintptr(disp), uintptr(name))
|
||||
return gunsafe.GoString(gunsafe.SliceOf(r))
|
||||
}
|
||||
|
||||
// issue34474KeepAlive calls runtime.KeepAlive as a
|
||||
// workaround for golang.org/issue/34474.
|
||||
func issue34474KeepAlive(v interface{}) {
|
||||
runtime.KeepAlive(v)
|
||||
}
|
||||
Reference in New Issue
Block a user