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// SPDX-License-Identifier: Unlicense OR MIT
// +build darwin,ios
package window
/*
#include <CoreFoundation/CoreFoundation.h>
#include <OpenGLES/ES2/gl.h>
#include <OpenGLES/ES2/glext.h>
__attribute__ ((visibility ("hidden"))) int gio_renderbufferStorage(CFTypeRef ctx, CFTypeRef layer, GLenum buffer);
__attribute__ ((visibility ("hidden"))) int gio_presentRenderbuffer(CFTypeRef ctx, GLenum buffer);
__attribute__ ((visibility ("hidden"))) int gio_makeCurrent(CFTypeRef ctx);
__attribute__ ((visibility ("hidden"))) CFTypeRef gio_createContext(void);
__attribute__ ((visibility ("hidden"))) CFTypeRef gio_createGLLayer(void);
*/
import "C"
import (
"errors"
"fmt"
"gioui.org/app/internal/glimpl"
"gioui.org/gpu/backend"
"gioui.org/gpu/gl"
)
type context struct {
owner *window
c *glimpl.Functions
ctx C.CFTypeRef
layer C.CFTypeRef
init bool
frameBuffer gl.Framebuffer
colorBuffer, depthBuffer gl.Renderbuffer
}
func init() {
layerFactory = func() uintptr {
return uintptr(C.gio_createGLLayer())
}
}
func newContext(w *window) (*context, error) {
ctx := C.gio_createContext()
if ctx == 0 {
return nil, fmt.Errorf("failed to create EAGLContext")
}
c := &context{
ctx: ctx,
owner: w,
layer: C.CFTypeRef(w.contextLayer()),
c: new(glimpl.Functions),
}
return c, nil
}
func (c *context) Backend() (backend.Device, error) {
return gl.NewBackend(c.c)
}
func (c *context) Release() {
if c.ctx == 0 {
return
}
C.gio_renderbufferStorage(c.ctx, 0, C.GLenum(gl.RENDERBUFFER))
c.c.DeleteFramebuffer(c.frameBuffer)
c.c.DeleteRenderbuffer(c.colorBuffer)
c.c.DeleteRenderbuffer(c.depthBuffer)
C.gio_makeCurrent(0)
C.CFRelease(c.ctx)
c.ctx = 0
}
func (c *context) Present() error {
if c.layer == 0 {
panic("context is not active")
}
// Discard depth buffer as recommended in
// https://developer.apple.com/library/archive/documentation/3DDrawing/Conceptual/OpenGLES_ProgrammingGuide/WorkingwithEAGLContexts/WorkingwithEAGLContexts.html
c.c.BindFramebuffer(gl.FRAMEBUFFER, c.frameBuffer)
c.c.InvalidateFramebuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT)
c.c.BindRenderbuffer(gl.RENDERBUFFER, c.colorBuffer)
if C.gio_presentRenderbuffer(c.ctx, C.GLenum(gl.RENDERBUFFER)) == 0 {
return errors.New("presentRenderBuffer failed")
}
return nil
}
func (c *context) Lock() {}
func (c *context) Unlock() {}
func (c *context) MakeCurrent() error {
if C.gio_makeCurrent(c.ctx) == 0 {
C.CFRelease(c.ctx)
c.ctx = 0
return errors.New("[EAGLContext setCurrentContext] failed")
}
if !c.init {
c.init = true
c.frameBuffer = c.c.CreateFramebuffer()
c.colorBuffer = c.c.CreateRenderbuffer()
c.depthBuffer = c.c.CreateRenderbuffer()
}
if !c.owner.isVisible() {
// Make sure any in-flight GL commands are complete.
c.c.Finish()
return nil
}
currentRB := gl.Renderbuffer{uint(c.c.GetInteger(gl.RENDERBUFFER_BINDING))}
c.c.BindRenderbuffer(gl.RENDERBUFFER, c.colorBuffer)
if C.gio_renderbufferStorage(c.ctx, c.layer, C.GLenum(gl.RENDERBUFFER)) == 0 {
return errors.New("renderbufferStorage failed")
}
w := c.c.GetRenderbufferParameteri(gl.RENDERBUFFER, gl.RENDERBUFFER_WIDTH)
h := c.c.GetRenderbufferParameteri(gl.RENDERBUFFER, gl.RENDERBUFFER_HEIGHT)
c.c.BindRenderbuffer(gl.RENDERBUFFER, c.depthBuffer)
c.c.RenderbufferStorage(gl.RENDERBUFFER, gl.DEPTH_COMPONENT16, w, h)
c.c.BindRenderbuffer(gl.RENDERBUFFER, currentRB)
c.c.BindFramebuffer(gl.FRAMEBUFFER, c.frameBuffer)
c.c.FramebufferRenderbuffer(gl.FRAMEBUFFER, gl.COLOR_ATTACHMENT0, gl.RENDERBUFFER, c.colorBuffer)
c.c.FramebufferRenderbuffer(gl.FRAMEBUFFER, gl.DEPTH_ATTACHMENT, gl.RENDERBUFFER, c.depthBuffer)
if st := c.c.CheckFramebufferStatus(gl.FRAMEBUFFER); st != gl.FRAMEBUFFER_COMPLETE {
return fmt.Errorf("framebuffer incomplete, status: %#x\n", st)
}
return nil
}
func (w *window) NewContext() (Context, error) {
return newContext(w)
}
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