app/internal/wm: rename confusing app/internal/window

Package wm (for "window manager") is a better fit for the package, and
distinguishes it from the low-level package windows for the Windows API.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

app/internal/wm/gl_ios.go

@@ -0,0 +1,132 @@
+// SPDX-License-Identifier: Unlicense OR MIT
+
+// +build darwin,ios
+
+package wm
+
+/*
+#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/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, 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(gl.Functions),
+	}
+	return c, nil
+}
+
+func (c *context) API() gpu.API {
+	return gpu.OpenGL{}
+}
+
+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)
+}