mirror of
https://github.com/hajimehoshi/ebiten.git
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206 lines
8.6 KiB
Go
206 lines
8.6 KiB
Go
// Copyright 2018 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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// Package ca provides access to Apple's Core Animation API (https://developer.apple.com/documentation/quartzcore).
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//
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// This package is in very early stages of development.
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// It's a minimal implementation with scope limited to
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// supporting the movingtriangle example.
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package ca
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import (
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"errors"
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"fmt"
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"runtime"
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"unsafe"
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"github.com/ebitengine/purego"
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"github.com/ebitengine/purego/objc"
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"github.com/hajimehoshi/ebiten/v2/internal/cocoa"
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"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver/metal/mtl"
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)
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// Layer is an object that manages image-based content and
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// allows you to perform animations on that content.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/calayer.
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type Layer interface {
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// Layer returns the underlying CALayer * pointer.
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Layer() unsafe.Pointer
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}
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// MetalLayer is a Core Animation Metal layer, a layer that manages a pool of Metal drawables.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer.
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type MetalLayer struct {
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metalLayer objc.ID
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}
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var (
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coreGraphics = purego.Dlopen("/System/Library/Frameworks/CoreGraphics.framework/Versions/Current/CoreGraphics", purego.RTLD_LAZY|purego.RTLD_GLOBAL)
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_CGColorSpaceCreateWithName = purego.Dlsym(coreGraphics, "CGColorSpaceCreateWithName")
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_CGColorSpaceRelease = purego.Dlsym(coreGraphics, "CGColorSpaceRelease")
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kCGColorSpaceDisplayP3 = purego.Dlsym(coreGraphics, "kCGColorSpaceDisplayP3")
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)
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// MakeMetalLayer creates a new Core Animation Metal layer.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer.
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func MakeMetalLayer() MetalLayer {
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layer := objc.ID(objc.GetClass("CAMetalLayer")).Send(objc.RegisterName("new"))
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if runtime.GOOS != "ios" {
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colorspace, _, _ := purego.SyscallN(_CGColorSpaceCreateWithName, **(**uintptr)(unsafe.Pointer(&kCGColorSpaceDisplayP3))) // Dlsym returns pointer to symbol so dereference it
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layer.Send(objc.RegisterName("setColorspace:"), colorspace)
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purego.SyscallN(_CGColorSpaceRelease, colorspace)
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}
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return MetalLayer{layer}
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}
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// Layer implements the Layer interface.
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func (ml MetalLayer) Layer() unsafe.Pointer {
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return *(*unsafe.Pointer)(unsafe.Pointer(&ml.metalLayer))
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}
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// PixelFormat returns the pixel format of textures for rendering layer content.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/1478155-pixelformat.
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func (ml MetalLayer) PixelFormat() mtl.PixelFormat {
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return mtl.PixelFormat(ml.metalLayer.Send(objc.RegisterName("pixelFormat")))
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}
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// SetDevice sets the Metal device responsible for the layer's drawable resources.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/1478163-device.
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func (ml MetalLayer) SetDevice(device mtl.Device) {
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ml.metalLayer.Send(objc.RegisterName("setDevice:"), uintptr(device.Device()))
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}
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// SetOpaque a Boolean value indicating whether the layer contains completely opaque content.
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func (ml MetalLayer) SetOpaque(opaque bool) {
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ml.metalLayer.Send(objc.RegisterName("setOpaque:"), opaque)
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}
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// SetPixelFormat controls the pixel format of textures for rendering layer content.
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//
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// The pixel format for a Metal layer must be PixelFormatBGRA8UNorm, PixelFormatBGRA8UNormSRGB,
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// PixelFormatRGBA16Float, PixelFormatBGRA10XR, or PixelFormatBGRA10XRSRGB.
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// SetPixelFormat panics for other values.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/1478155-pixelformat.
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func (ml MetalLayer) SetPixelFormat(pf mtl.PixelFormat) {
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switch pf {
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case mtl.PixelFormatRGBA8UNorm, mtl.PixelFormatRGBA8UNormSRGB, mtl.PixelFormatBGRA8UNorm, mtl.PixelFormatBGRA8UNormSRGB, mtl.PixelFormatStencil8:
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default:
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panic(errors.New(fmt.Sprintf("invalid pixel format %d", pf)))
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}
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ml.metalLayer.Send(objc.RegisterName("setPixelFormat:"), uint(pf))
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}
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// SetMaximumDrawableCount controls the number of Metal drawables in the resource pool
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// managed by Core Animation.
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//
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// It can set to 2 or 3 only. SetMaximumDrawableCount panics for other values.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/2938720-maximumdrawablecount.
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func (ml MetalLayer) SetMaximumDrawableCount(count int) {
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if count < 2 || count > 3 {
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panic(errors.New(fmt.Sprintf("failed trying to set maximumDrawableCount to %d outside of the valid range of [2, 3]", count)))
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}
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ml.metalLayer.Send(objc.RegisterName("setMaximumDrawableCount:"), count)
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}
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// SetDisplaySyncEnabled controls whether the Metal layer and its drawables
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// are synchronized with the display's refresh rate.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/2887087-displaysyncenabled.
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func (ml MetalLayer) SetDisplaySyncEnabled(enabled bool) {
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if runtime.GOOS == "ios" {
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return
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}
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ml.metalLayer.Send(objc.RegisterName("setDisplaySyncEnabled:"), enabled)
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}
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// SetDrawableSize sets the size, in pixels, of textures for rendering layer content.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/1478174-drawablesize.
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func (ml MetalLayer) SetDrawableSize(width, height int) {
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// TODO: once objc supports calling functions with struct arguments replace this with just a ID.Send call
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var sel_setDrawableSize = objc.RegisterName("setDrawableSize:")
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sig := cocoa.NSMethodSignature_instanceMethodSignatureForSelector(objc.ID(objc.GetClass("CAMetalLayer")), sel_setDrawableSize)
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inv := cocoa.NSInvocation_invocationWithMethodSignature(sig)
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inv.SetTarget(ml.metalLayer)
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inv.SetSelector(sel_setDrawableSize)
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inv.SetArgumentAtIndex(unsafe.Pointer(&cocoa.CGSize{Width: cocoa.CGFloat(width), Height: cocoa.CGFloat(height)}), 2)
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inv.Invoke()
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}
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// NextDrawable returns a Metal drawable.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/1478172-nextdrawable.
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func (ml MetalLayer) NextDrawable() (MetalDrawable, error) {
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md := ml.metalLayer.Send(objc.RegisterName("nextDrawable"))
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if md == 0 {
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return MetalDrawable{}, errors.New("nextDrawable returned nil")
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}
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return MetalDrawable{md}, nil
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}
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// PresentsWithTransaction returns a Boolean value that determines whether the layer presents its content using a Core Animation transaction.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/1478157-presentswithtransaction
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func (ml MetalLayer) PresentsWithTransaction() bool {
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return ml.metalLayer.Send(objc.RegisterName("presentsWithTransaction")) != 0
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}
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// SetPresentsWithTransaction sets a Boolean value that determines whether the layer presents its content using a Core Animation transaction.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametallayer/1478157-presentswithtransaction
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func (ml MetalLayer) SetPresentsWithTransaction(presentsWithTransaction bool) {
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ml.metalLayer.Send(objc.RegisterName("setPresentsWithTransaction:"), presentsWithTransaction)
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}
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// SetFramebufferOnly sets a Boolean value that determines whether the layer’s textures are used only for rendering.
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//
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// https://developer.apple.com/documentation/quartzcore/cametallayer/1478168-framebufferonly
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func (ml MetalLayer) SetFramebufferOnly(framebufferOnly bool) {
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ml.metalLayer.Send(objc.RegisterName("setFramebufferOnly:"), framebufferOnly)
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}
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// MetalDrawable is a displayable resource that can be rendered or written to by Metal.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametaldrawable.
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type MetalDrawable struct {
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metalDrawable objc.ID
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}
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// Drawable implements the mtl.Drawable interface.
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func (md MetalDrawable) Drawable() unsafe.Pointer {
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return *(*unsafe.Pointer)(unsafe.Pointer(&md.metalDrawable))
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}
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// Texture returns a Metal texture object representing the drawable object's content.
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//
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// Reference: https://developer.apple.com/documentation/quartzcore/cametaldrawable/1478159-texture.
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func (md MetalDrawable) Texture() mtl.Texture {
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return mtl.NewTexture(md.metalDrawable.Send(objc.RegisterName("texture")))
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}
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// Present presents the drawable onscreen as soon as possible.
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//
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// Reference: https://developer.apple.com/documentation/metal/mtldrawable/1470284-present.
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func (md MetalDrawable) Present() {
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md.metalDrawable.Send(objc.RegisterName("present"))
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}
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