ebiten/internal/graphicsdriver/directx/graphics_windows.go

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// Copyright 2022 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package directx
import (
"errors"
"fmt"
"math"
"os"
"runtime"
"strconv"
"strings"
"time"
"unsafe"
"golang.org/x/sys/windows"
"github.com/hajimehoshi/ebiten/v2/internal/graphicsdriver"
"github.com/hajimehoshi/ebiten/v2/internal/microsoftgdk"
)
type stencilMode int
const (
prepareStencil stencilMode = iota
drawWithStencil
noStencil
)
const frameCount = 2
func pow2(x uint32) uint32 {
if x > (math.MaxUint32+1)/2 {
return math.MaxUint32
}
var p2 uint32 = 1
for p2 < x {
p2 *= 2
}
return p2
}
func parseFeatureLevel(str string) (_D3D_FEATURE_LEVEL, bool) {
switch str {
case "11_0":
return _D3D_FEATURE_LEVEL_11_0, true
case "11_1":
return _D3D_FEATURE_LEVEL_11_1, true
case "12_0":
return _D3D_FEATURE_LEVEL_12_0, true
case "12_1":
return _D3D_FEATURE_LEVEL_12_1, true
case "12_2":
return _D3D_FEATURE_LEVEL_12_2, true
default:
return 0, false
}
}
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// NewGraphics creates an implementation of graphicsdriver.Graphics for DirectX.
// The returned graphics value is nil iff the error is not nil.
func NewGraphics() (graphicsdriver.Graphics, error) {
var useWARP bool
var useDebugLayer bool
version := 11
// Specify the feature level 11 by default.
// Some old cards don't work well with the default feature level (#2447, #2486).
featureLevel := _D3D_FEATURE_LEVEL_11_0
// Parse a special environment variable for backward compatibility.
if env := os.Getenv("EBITENGINE_DIRECTX_FEATURE_LEVEL"); env != "" {
if fl, ok := parseFeatureLevel(env); ok {
featureLevel = fl
}
}
env := os.Getenv("EBITENGINE_DIRECTX")
if env == "" {
// For backward compatibility, read the EBITEN_ version.
env = os.Getenv("EBITEN_DIRECTX")
}
for _, t := range strings.Split(env, ",") {
t := strings.TrimSpace(t)
switch {
case t == "warp":
// TODO: Is WARP available on Xbox?
useWARP = true
case t == "debug":
useDebugLayer = true
case strings.HasPrefix(t, "version="):
v, err := strconv.Atoi(t[len("version="):])
if err != nil {
continue
}
version = v
case strings.HasPrefix(t, "featurelevel="):
fl, ok := parseFeatureLevel(t[len("featurelevel="):])
if !ok {
continue
}
featureLevel = fl
}
}
// On Xbox, only DirectX 12 is available.
if microsoftgdk.IsXbox() {
version = 12
}
switch version {
case 11:
g, err := newGraphics11(useWARP, useDebugLayer)
if err != nil {
return nil, err
}
return g, nil
case 12:
g, err := newGraphics12(useWARP, useDebugLayer, featureLevel)
if err != nil {
return nil, err
}
return g, nil
default:
panic(fmt.Sprintf("directx: unexpected DirectX version: %d", version))
}
}
type graphicsInfra struct {
factory *_IDXGIFactory4
swapChain *_IDXGISwapChain4
allowTearing bool
// occluded reports whether the screen is invisible or not.
occluded bool
// lastTime is the last time for rendering.
lastTime time.Time
}
func newGraphicsInfra(debug bool) (*graphicsInfra, error) {
var flag uint32
if debug {
flag = _DXGI_CREATE_FACTORY_DEBUG
}
f, err := _CreateDXGIFactory2(flag)
if err != nil {
return nil, err
}
g := &graphicsInfra{
factory: f,
}
runtime.SetFinalizer(g, (*graphicsInfra).release)
if f, err := g.factory.QueryInterface(&_IID_IDXGIFactory5); err == nil && f != nil {
factory := (*_IDXGIFactory5)(f)
defer factory.Release()
var allowTearing int32
if err := factory.CheckFeatureSupport(_DXGI_FEATURE_PRESENT_ALLOW_TEARING, unsafe.Pointer(&allowTearing), uint32(unsafe.Sizeof(allowTearing))); err == nil && allowTearing != 0 {
g.allowTearing = true
}
}
return g, nil
}
func (g *graphicsInfra) release() {
if g.factory != nil {
g.factory.Release()
g.factory = nil
}
if g.swapChain != nil {
g.swapChain.Release()
g.swapChain = nil
}
}
// appendAdapters appends found adapters to the given adapters.
// Releasing them is the caller's responsibility.
//
// warpForDX12 is valid only for DirectX 12.
func (g *graphicsInfra) appendAdapters(adapters []*_IDXGIAdapter1, warpForDX12 bool) ([]*_IDXGIAdapter1, error) {
if warpForDX12 {
a, err := g.factory.EnumWarpAdapter()
if err != nil {
return nil, err
}
adapters = append(adapters, a)
return adapters, nil
}
for i := uint32(0); ; i++ {
a, err := g.factory.EnumAdapters1(i)
if errors.Is(err, _DXGI_ERROR_NOT_FOUND) {
break
}
if err != nil {
return nil, err
}
adapters = append(adapters, a)
}
return adapters, nil
}
func (g *graphicsInfra) isSwapChainInited() bool {
return g.swapChain != nil
}
func (g *graphicsInfra) initSwapChain(width, height int, device unsafe.Pointer, window windows.HWND) (ferr error) {
if g.swapChain != nil {
return fmt.Errorf("directx: swap chain must not be initialized at initSwapChain, but is already done")
}
// Create a swap chain.
//
// DXGI_ALPHA_MODE_PREMULTIPLIED doesn't work with a HWND well.
//
// IDXGIFactory::CreateSwapChain: Alpha blended swapchains must be created with CreateSwapChainForComposition,
// or CreateSwapChainForCoreWindow with the DXGI_SWAP_CHAIN_FLAG_FOREGROUND_LAYER flag
desc := &_DXGI_SWAP_CHAIN_DESC1{
Width: uint32(width),
Height: uint32(height),
Format: _DXGI_FORMAT_B8G8R8A8_UNORM,
BufferUsage: _DXGI_USAGE_RENDER_TARGET_OUTPUT,
BufferCount: frameCount,
SwapEffect: _DXGI_SWAP_EFFECT_FLIP_DISCARD,
SampleDesc: _DXGI_SAMPLE_DESC{
Count: 1,
Quality: 0,
},
}
if g.allowTearing {
desc.Flags |= uint32(_DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING)
}
s, err := g.factory.CreateSwapChainForHwnd(device, window, desc, nil, nil)
if err != nil {
return err
}
s.As(&g.swapChain)
defer func() {
if ferr != nil {
g.release()
}
}()
// MakeWindowAssociation should be called after swap chain creation.
// https://docs.microsoft.com/en-us/windows/win32/api/dxgi/nf-dxgi-idxgifactory-makewindowassociation
if err := g.factory.MakeWindowAssociation(window, _DXGI_MWA_NO_WINDOW_CHANGES|_DXGI_MWA_NO_ALT_ENTER); err != nil {
return err
}
return nil
}
func (g *graphicsInfra) resizeSwapChain(width, height int) error {
if g.swapChain == nil {
return fmt.Errorf("directx: swap chain must be initialized at resizeSwapChain, but is not")
}
var flag uint32
if g.allowTearing {
flag |= uint32(_DXGI_SWAP_CHAIN_FLAG_ALLOW_TEARING)
}
if err := g.swapChain.ResizeBuffers(frameCount, uint32(width), uint32(height), _DXGI_FORMAT_B8G8R8A8_UNORM, flag); err != nil {
return err
}
return nil
}
func (g *graphicsInfra) currentBackBufferIndex() int {
return int(g.swapChain.GetCurrentBackBufferIndex())
}
func (g *graphicsInfra) present(vsyncEnabled bool) error {
if g.swapChain == nil {
return fmt.Errorf("directx: swap chain must be initialized at present, but is not")
}
var syncInterval uint32
var flags _DXGI_PRESENT
if g.occluded {
// The screen is not visible. Test whether we can resume.
flags |= _DXGI_PRESENT_TEST
} else {
// Do actual rendering only when the screen is visible.
if vsyncEnabled {
syncInterval = 1
} else if g.allowTearing {
flags |= _DXGI_PRESENT_ALLOW_TEARING
}
}
occluded, err := g.swapChain.Present(syncInterval, uint32(flags))
if err != nil {
return err
}
g.occluded = occluded
// Reduce FPS when the screen is invisible.
now := time.Now()
if g.occluded {
if delta := 100*time.Millisecond - now.Sub(g.lastTime); delta > 0 {
time.Sleep(delta)
}
}
g.lastTime = now
return nil
}
func (g *graphicsInfra) getBuffer(buffer uint32, riid *windows.GUID) (unsafe.Pointer, error) {
return g.swapChain.GetBuffer(buffer, riid)
}