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// SPDX-License-Identifier: Unlicense OR MIT
//go:build darwin && ios && nometal
// +build darwin,ios,nometal
package app
/*
@import UIKit;
#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);
static CFTypeRef getViewLayer(CFTypeRef viewRef) {
@autoreleasepool {
UIView *view = (__bridge UIView *)viewRef;
return CFBridgingRetain(view.layer);
}
}
*/
import "C"
import (
"errors"
"fmt"
"runtime"
"gioui.org/gpu"
"gioui.org/internal/gl"
)
type context struct {
owner *window
c *gl.Functions
ctx C.CFTypeRef
layer C.CFTypeRef
init bool
frameBuffer gl.Framebuffer
colorBuffer gl.Renderbuffer
}
func newContext(w *window) (*context, error) {
ctx := C.gio_createContext()
if ctx == 0 {
return nil, fmt.Errorf("failed to create EAGLContext")
}
api := contextAPI()
f, err := gl.NewFunctions(api.Context, api.ES)
if err != nil {
return nil, err
}
c := &context{
ctx: ctx,
owner: w,
layer: C.getViewLayer(w.contextView()),
c: f,
}
return c, nil
}
func contextAPI() gpu.OpenGL {
return gpu.OpenGL{}
}
func (c *context) RenderTarget() gpu.RenderTarget {
return gpu.OpenGLRenderTarget(c.frameBuffer)
}
func (c *context) API() gpu.API {
return contextAPI()
}
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.gio_makeCurrent(0)
C.CFRelease(c.ctx)
c.ctx = 0
}
func (c *context) Present() error {
if c.layer == 0 {
panic("context is not active")
}
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() error {
// OpenGL contexts are implicit and thread-local. Lock the OS thread.
runtime.LockOSThread()
if C.gio_makeCurrent(c.ctx) == 0 {
return errors.New("[EAGLContext setCurrentContext] failed")
}
return nil
}
func (c *context) Unlock() {
C.gio_makeCurrent(0)
}
func (c *context) Refresh() error {
if C.gio_makeCurrent(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()
}
if !c.owner.visible {
// 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")
}
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)
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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