ebiten/internal/graphicsdriver/metal/driver.go

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// Copyright 2018 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.
// +build darwin
package metal
import (
"fmt"
"strings"
"unsafe"
"github.com/hajimehoshi/ebiten/internal/affine"
"github.com/hajimehoshi/ebiten/internal/driver"
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"github.com/hajimehoshi/ebiten/internal/graphics"
"github.com/hajimehoshi/ebiten/internal/graphicsdriver/metal/ca"
"github.com/hajimehoshi/ebiten/internal/graphicsdriver/metal/mtl"
"github.com/hajimehoshi/ebiten/internal/thread"
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)
// #cgo CFLAGS: -x objective-c
// #cgo !ios CFLAGS: -mmacosx-version-min=10.11
// #cgo LDFLAGS: -framework Foundation
//
// #import <Foundation/Foundation.h>
//
// static void* allocAutoreleasePool() {
// return [[NSAutoreleasePool alloc] init];
// }
//
// static void releaseAutoreleasePool(void* pool) {
// [(NSAutoreleasePool*)pool release];
// }
import "C"
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const source = `#include <metal_stdlib>
#define FILTER_NEAREST {{.FilterNearest}}
#define FILTER_LINEAR {{.FilterLinear}}
#define FILTER_SCREEN {{.FilterScreen}}
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#define ADDRESS_CLAMP_TO_ZERO {{.AddressClampToZero}}
#define ADDRESS_REPEAT {{.AddressRepeat}}
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using namespace metal;
struct VertexIn {
packed_float2 position;
packed_float2 tex;
packed_float4 tex_region;
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packed_float4 color;
};
struct VertexOut {
float4 position [[position]];
float2 tex;
float4 tex_region;
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float4 color;
};
vertex VertexOut VertexShader(
uint vid [[vertex_id]],
device VertexIn* vertices [[buffer(0)]],
constant float2& viewport_size [[buffer(1)]]
) {
float4x4 projectionMatrix = float4x4(
float4(2.0 / viewport_size.x, 0, 0, 0),
float4(0, -2.0 / viewport_size.y, 0, 0),
float4(0, 0, 1, 0),
float4(-1, 1, 0, 1)
);
VertexIn in = vertices[vid];
VertexOut out = {
.position = projectionMatrix * float4(in.position, 0, 1),
.tex = in.tex,
.tex_region = in.tex_region,
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.color = in.color,
};
return out;
}
// AdjustTexels adjust texels.
// See #669, #759
float2 AdjustTexel(float2 source_size, float2 p0, float2 p1) {
const float2 texel_size = 1.0 / source_size;
if (fract((p1.x-p0.x)*source_size.x) == 0.0) {
p1.x -= texel_size.x / 512.0;
}
if (fract((p1.y-p0.y)*source_size.y) == 0.0) {
p1.y -= texel_size.y / 512.0;
}
return p1;
}
float FloorMod(float x, float y) {
if (x < 0.0) {
return y - (-x - y * floor(-x/y));
}
return x - y * floor(x/y);
}
template<uint8_t address>
float2 AdjustTexelByAddress(float2 p, float4 tex_region);
template<>
inline float2 AdjustTexelByAddress<ADDRESS_CLAMP_TO_ZERO>(float2 p, float4 tex_region) {
return p;
}
template<>
inline float2 AdjustTexelByAddress<ADDRESS_REPEAT>(float2 p, float4 tex_region) {
float2 o = float2(tex_region[0], tex_region[1]);
float2 size = float2(tex_region[2] - tex_region[0], tex_region[3] - tex_region[1]);
return float2(FloorMod((p.x - o.x), size.x) + o.x, FloorMod((p.y - o.y), size.y) + o.y);
}
template<uint8_t filter, uint8_t address>
struct ColorFromTexel;
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template<uint8_t address>
struct ColorFromTexel<FILTER_NEAREST, address> {
inline float4 Do(VertexOut v, texture2d<float> texture, constant float2& source_size, float scale) {
float2 p = AdjustTexelByAddress<address>(v.tex, v.tex_region);
if (v.tex_region[0] <= p.x &&
v.tex_region[1] <= p.y &&
p.x < v.tex_region[2] &&
p.y < v.tex_region[3]) {
constexpr sampler texture_sampler(filter::nearest);
return texture.sample(texture_sampler, p);
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}
return 0.0;
}
};
template<uint8_t address>
struct ColorFromTexel<FILTER_LINEAR, address> {
inline float4 Do(VertexOut v, texture2d<float> texture, constant float2& source_size, float scale) {
constexpr sampler texture_sampler(filter::nearest);
const float2 texel_size = 1 / source_size;
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float2 p0 = v.tex - texel_size / 2.0;
float2 p1 = v.tex + texel_size / 2.0;
p1 = AdjustTexel(source_size, p0, p1);
p0 = AdjustTexelByAddress<address>(p0, v.tex_region);
p1 = AdjustTexelByAddress<address>(p1, v.tex_region);
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float4 c0 = texture.sample(texture_sampler, p0);
float4 c1 = texture.sample(texture_sampler, float2(p1.x, p0.y));
float4 c2 = texture.sample(texture_sampler, float2(p0.x, p1.y));
float4 c3 = texture.sample(texture_sampler, p1);
if (p0.x < v.tex_region[0]) {
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c0 = 0;
c2 = 0;
}
if (p0.y < v.tex_region[1]) {
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c0 = 0;
c1 = 0;
}
if (v.tex_region[2] <= p1.x) {
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c1 = 0;
c3 = 0;
}
if (v.tex_region[3] <= p1.y) {
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c2 = 0;
c3 = 0;
}
float2 rate = fract(p0 * source_size);
return mix(mix(c0, c1, rate.x), mix(c2, c3, rate.x), rate.y);
}
};
template<uint8_t address>
struct ColorFromTexel<FILTER_SCREEN, address> {
inline float4 Do(VertexOut v, texture2d<float> texture, constant float2& source_size, float scale) {
constexpr sampler texture_sampler(filter::nearest);
const float2 texel_size = 1 / source_size;
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float2 p0 = v.tex - texel_size / 2.0 / scale;
float2 p1 = v.tex + texel_size / 2.0 / scale;
p1 = AdjustTexel(source_size, p0, p1);
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float4 c0 = texture.sample(texture_sampler, p0);
float4 c1 = texture.sample(texture_sampler, float2(p1.x, p0.y));
float4 c2 = texture.sample(texture_sampler, float2(p0.x, p1.y));
float4 c3 = texture.sample(texture_sampler, p1);
float2 rate_center = float2(1.0, 1.0) - texel_size / 2.0 / scale;
float2 rate = clamp(((fract(p0 * source_size) - rate_center) * scale) + rate_center, 0.0, 1.0);
return mix(mix(c0, c1, rate.x), mix(c2, c3, rate.x), rate.y);
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}
};
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template<bool useColorM, uint8_t filter, uint8_t address>
struct FragmentShaderImpl {
inline float4 Do(
VertexOut v,
texture2d<float> texture,
constant float2& source_size,
constant float4x4& color_matrix_body,
constant float4& color_matrix_translation,
constant float& scale) {
float4 c = ColorFromTexel<filter, address>().Do(v, texture, source_size, scale);
if (useColorM) {
c.rgb /= c.a + (1.0 - sign(c.a));
c = (color_matrix_body * c) + color_matrix_translation;
c *= v.color;
c.rgb *= c.a;
} else {
float4 s = v.color;
c *= float4(s.r, s.g, s.b, 1.0) * s.a;
}
c = min(c, c.a);
return c;
}
};
template<bool useColorM, uint8_t address>
struct FragmentShaderImpl<useColorM, FILTER_SCREEN, address> {
inline float4 Do(
VertexOut v,
texture2d<float> texture,
constant float2& source_size,
constant float4x4& color_matrix_body,
constant float4& color_matrix_translation,
constant float& scale) {
return ColorFromTexel<FILTER_SCREEN, address>().Do(v, texture, source_size, scale);
}
};
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// Define Foo and FooCp macros to force macro replacement.
// See "6.10.3.1 Argument substitution" in ISO/IEC 9899.
#define FragmentShaderFunc(useColorM, filter, address) \
FragmentShaderFuncCp(useColorM, filter, address)
#define FragmentShaderFuncCp(useColorM, filter, address) \
fragment float4 FragmentShader_##useColorM##_##filter##_##address( \
VertexOut v [[stage_in]], \
texture2d<float> texture [[texture(0)]], \
constant float2& source_size [[buffer(2)]], \
constant float4x4& color_matrix_body [[buffer(3)]], \
constant float4& color_matrix_translation [[buffer(4)]], \
constant float& scale [[buffer(5)]]) { \
return FragmentShaderImpl<useColorM, filter, address>().Do( \
v, texture, source_size, color_matrix_body, color_matrix_translation, scale); \
}
FragmentShaderFunc(0, FILTER_NEAREST, ADDRESS_CLAMP_TO_ZERO)
FragmentShaderFunc(0, FILTER_LINEAR, ADDRESS_CLAMP_TO_ZERO)
FragmentShaderFunc(0, FILTER_NEAREST, ADDRESS_REPEAT)
FragmentShaderFunc(0, FILTER_LINEAR, ADDRESS_REPEAT)
FragmentShaderFunc(1, FILTER_NEAREST, ADDRESS_CLAMP_TO_ZERO)
FragmentShaderFunc(1, FILTER_LINEAR, ADDRESS_CLAMP_TO_ZERO)
FragmentShaderFunc(1, FILTER_NEAREST, ADDRESS_REPEAT)
FragmentShaderFunc(1, FILTER_LINEAR, ADDRESS_REPEAT)
FragmentShaderFunc(0, FILTER_SCREEN, ADDRESS_CLAMP_TO_ZERO)
#undef FragmentShaderFuncName
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`
type rpsKey struct {
useColorM bool
filter graphics.Filter
address graphics.Address
compositeMode graphics.CompositeMode
}
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type Driver struct {
view view
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screenRPS mtl.RenderPipelineState
rpss map[rpsKey]mtl.RenderPipelineState
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cq mtl.CommandQueue
cb mtl.CommandBuffer
screenDrawable ca.MetalDrawable
vb mtl.Buffer
ib mtl.Buffer
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src *Image
dst *Image
maxImageSize int
t *thread.Thread
pool unsafe.Pointer
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}
var theDriver Driver
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func Get() *Driver {
return &theDriver
}
func (d *Driver) SetThread(thread *thread.Thread) {
d.t = thread
}
func (d *Driver) Begin() {
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d.t.Call(func() error {
// NSAutoreleasePool is required to release drawable correctly (#847).
// https://developer.apple.com/library/archive/documentation/3DDrawing/Conceptual/MTLBestPracticesGuide/Drawables.html
d.pool = C.allocAutoreleasePool()
return nil
})
}
func (d *Driver) End() {
d.flush(false, true)
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d.t.Call(func() error {
d.screenDrawable = ca.MetalDrawable{}
C.releaseAutoreleasePool(d.pool)
d.pool = nil
return nil
})
}
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func (d *Driver) SetWindow(window uintptr) {
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d.t.Call(func() error {
// Note that [NSApp mainWindow] returns nil when the window is borderless.
// Then the window is needed to be given explicitly.
d.view.setWindow(window)
return nil
})
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}
func (d *Driver) SetVertices(vertices []float32, indices []uint16) {
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d.t.Call(func() error {
if d.vb != (mtl.Buffer{}) {
d.vb.Release()
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}
if d.ib != (mtl.Buffer{}) {
d.ib.Release()
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}
d.vb = d.view.getMTLDevice().MakeBufferWithBytes(unsafe.Pointer(&vertices[0]), unsafe.Sizeof(vertices[0])*uintptr(len(vertices)), mtl.ResourceStorageModeManaged)
d.ib = d.view.getMTLDevice().MakeBufferWithBytes(unsafe.Pointer(&indices[0]), unsafe.Sizeof(indices[0])*uintptr(len(indices)), mtl.ResourceStorageModeManaged)
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return nil
})
}
func (d *Driver) Flush() {
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// On Metal, flushing command buffers only once is enough except for manipulating pixels. Do not call flush.
}
func (d *Driver) flush(wait bool, present bool) {
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d.t.Call(func() error {
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if d.cb == (mtl.CommandBuffer{}) {
return nil
}
if present && d.screenDrawable != (ca.MetalDrawable{}) {
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d.cb.PresentDrawable(d.screenDrawable)
}
d.cb.Commit()
if wait {
d.cb.WaitUntilCompleted()
}
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d.cb = mtl.CommandBuffer{}
return nil
})
}
func (d *Driver) checkSize(width, height int) {
m := 0
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d.t.Call(func() error {
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if d.maxImageSize == 0 {
d.maxImageSize = 4096
// https://developer.apple.com/metal/Metal-Feature-Set-Tables.pdf
switch {
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily5_v1):
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d.maxImageSize = 16384
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily4_v1):
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d.maxImageSize = 16384
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily3_v1):
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d.maxImageSize = 16384
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily2_v2):
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d.maxImageSize = 8192
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily2_v1):
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d.maxImageSize = 4096
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily1_v2):
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d.maxImageSize = 8192
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_iOS_GPUFamily1_v1):
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d.maxImageSize = 4096
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_tvOS_GPUFamily2_v1):
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d.maxImageSize = 16384
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_tvOS_GPUFamily1_v1):
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d.maxImageSize = 8192
case d.view.getMTLDevice().SupportsFeatureSet(mtl.FeatureSet_macOS_GPUFamily1_v1):
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d.maxImageSize = 16384
default:
panic("metal: there is no supported feature set")
}
}
m = d.maxImageSize
return nil
})
if width < 1 {
panic(fmt.Sprintf("metal: width (%d) must be equal or more than %d", width, 1))
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}
if height < 1 {
panic(fmt.Sprintf("metal: height (%d) must be equal or more than %d", height, 1))
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}
if width > m {
panic(fmt.Sprintf("metal: width (%d) must be less than or equal to %d", width, m))
}
if height > m {
panic(fmt.Sprintf("metal: height (%d) must be less than or equal to %d", height, m))
}
}
func (d *Driver) NewImage(width, height int) (driver.Image, error) {
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d.checkSize(width, height)
td := mtl.TextureDescriptor{
PixelFormat: mtl.PixelFormatRGBA8UNorm,
Width: graphics.InternalImageSize(width),
Height: graphics.InternalImageSize(height),
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StorageMode: mtl.StorageModeManaged,
// MTLTextureUsageRenderTarget might cause a problematic render result. Not sure the reason.
// Usage: mtl.TextureUsageShaderRead | mtl.TextureUsageRenderTarget
Usage: mtl.TextureUsageShaderRead,
}
var t mtl.Texture
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d.t.Call(func() error {
t = d.view.getMTLDevice().MakeTexture(td)
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return nil
})
return &Image{
driver: d,
width: width,
height: height,
texture: t,
}, nil
}
func (d *Driver) NewScreenFramebufferImage(width, height int) (driver.Image, error) {
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d.t.Call(func() error {
d.view.setDrawableSize(width, height)
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return nil
})
return &Image{
driver: d,
width: width,
height: height,
screen: true,
}, nil
}
func (d *Driver) Reset() error {
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if err := d.t.Call(func() error {
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if d.cq != (mtl.CommandQueue{}) {
d.cq.Release()
d.cq = mtl.CommandQueue{}
}
// TODO: Release existing rpss
if d.rpss == nil {
d.rpss = map[rpsKey]mtl.RenderPipelineState{}
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}
if err := d.view.reset(); err != nil {
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return err
}
replaces := map[string]string{
"{{.FilterNearest}}": fmt.Sprintf("%d", graphics.FilterNearest),
"{{.FilterLinear}}": fmt.Sprintf("%d", graphics.FilterLinear),
"{{.FilterScreen}}": fmt.Sprintf("%d", graphics.FilterScreen),
"{{.AddressClampToZero}}": fmt.Sprintf("%d", graphics.AddressClampToZero),
"{{.AddressRepeat}}": fmt.Sprintf("%d", graphics.AddressRepeat),
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}
src := source
for k, v := range replaces {
src = strings.Replace(src, k, v, -1)
}
lib, err := d.view.getMTLDevice().MakeLibrary(src, mtl.CompileOptions{})
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if err != nil {
return err
}
vs, err := lib.MakeFunction("VertexShader")
if err != nil {
return err
}
fs, err := lib.MakeFunction(
fmt.Sprintf("FragmentShader_%d_%d_%d", 0, graphics.FilterScreen, graphics.AddressClampToZero))
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if err != nil {
return err
}
rpld := mtl.RenderPipelineDescriptor{
VertexFunction: vs,
FragmentFunction: fs,
}
rpld.ColorAttachments[0].PixelFormat = d.view.colorPixelFormat()
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rpld.ColorAttachments[0].BlendingEnabled = true
rpld.ColorAttachments[0].DestinationAlphaBlendFactor = mtl.BlendFactorZero
rpld.ColorAttachments[0].DestinationRGBBlendFactor = mtl.BlendFactorZero
rpld.ColorAttachments[0].SourceAlphaBlendFactor = mtl.BlendFactorOne
rpld.ColorAttachments[0].SourceRGBBlendFactor = mtl.BlendFactorOne
rps, err := d.view.getMTLDevice().MakeRenderPipelineState(rpld)
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if err != nil {
return err
}
d.screenRPS = rps
conv := func(c graphics.Operation) mtl.BlendFactor {
switch c {
case graphics.Zero:
return mtl.BlendFactorZero
case graphics.One:
return mtl.BlendFactorOne
case graphics.SrcAlpha:
return mtl.BlendFactorSourceAlpha
case graphics.DstAlpha:
return mtl.BlendFactorDestinationAlpha
case graphics.OneMinusSrcAlpha:
return mtl.BlendFactorOneMinusSourceAlpha
case graphics.OneMinusDstAlpha:
return mtl.BlendFactorOneMinusDestinationAlpha
default:
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panic(fmt.Sprintf("metal: invalid operation: %d", c))
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}
}
for _, cm := range []bool{false, true} {
for _, a := range []graphics.Address{
graphics.AddressClampToZero,
graphics.AddressRepeat,
} {
for _, f := range []graphics.Filter{
graphics.FilterNearest,
graphics.FilterLinear,
} {
for c := graphics.CompositeModeSourceOver; c <= graphics.CompositeModeMax; c++ {
cmi := 0
if cm {
cmi = 1
}
fs, err := lib.MakeFunction(fmt.Sprintf("FragmentShader_%d_%d_%d", cmi, f, a))
if err != nil {
return err
}
rpld := mtl.RenderPipelineDescriptor{
VertexFunction: vs,
FragmentFunction: fs,
}
rpld.ColorAttachments[0].PixelFormat = mtl.PixelFormatRGBA8UNorm
rpld.ColorAttachments[0].BlendingEnabled = true
src, dst := c.Operations()
rpld.ColorAttachments[0].DestinationAlphaBlendFactor = conv(dst)
rpld.ColorAttachments[0].DestinationRGBBlendFactor = conv(dst)
rpld.ColorAttachments[0].SourceAlphaBlendFactor = conv(src)
rpld.ColorAttachments[0].SourceRGBBlendFactor = conv(src)
rps, err := d.view.getMTLDevice().MakeRenderPipelineState(rpld)
if err != nil {
return err
}
d.rpss[rpsKey{
useColorM: cm,
filter: f,
address: a,
compositeMode: c,
}] = rps
}
}
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}
}
d.cq = d.view.getMTLDevice().MakeCommandQueue()
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return nil
}); err != nil {
return err
}
return nil
}
func (d *Driver) Draw(indexLen int, indexOffset int, mode graphics.CompositeMode, colorM *affine.ColorM, filter graphics.Filter, address graphics.Address) error {
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if err := d.t.Call(func() error {
d.view.update()
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rpd := mtl.RenderPassDescriptor{}
if d.dst.screen {
rpd.ColorAttachments[0].LoadAction = mtl.LoadActionDontCare
rpd.ColorAttachments[0].StoreAction = mtl.StoreActionStore
} else {
rpd.ColorAttachments[0].LoadAction = mtl.LoadActionLoad
rpd.ColorAttachments[0].StoreAction = mtl.StoreActionStore
}
var t mtl.Texture
if d.dst.screen {
if d.screenDrawable == (ca.MetalDrawable{}) {
drawable := d.view.drawable()
if drawable == (ca.MetalDrawable{}) {
return nil
}
d.screenDrawable = drawable
}
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t = d.screenDrawable.Texture()
} else {
t = d.dst.texture
}
rpd.ColorAttachments[0].Texture = t
rpd.ColorAttachments[0].ClearColor = mtl.ClearColor{}
w, h := d.dst.viewportSize()
if d.cb == (mtl.CommandBuffer{}) {
d.cb = d.cq.MakeCommandBuffer()
}
rce := d.cb.MakeRenderCommandEncoder(rpd)
if d.dst.screen && filter == graphics.FilterScreen {
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rce.SetRenderPipelineState(d.screenRPS)
} else {
rce.SetRenderPipelineState(d.rpss[rpsKey{
useColorM: colorM != nil,
filter: filter,
address: address,
compositeMode: mode,
}])
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}
rce.SetViewport(mtl.Viewport{0, 0, float64(w), float64(h), -1, 1})
rce.SetVertexBuffer(d.vb, 0, 0)
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viewportSize := [...]float32{float32(w), float32(h)}
rce.SetVertexBytes(unsafe.Pointer(&viewportSize[0]), unsafe.Sizeof(viewportSize), 1)
sourceSize := [...]float32{
float32(graphics.InternalImageSize(d.src.width)),
float32(graphics.InternalImageSize(d.src.height)),
}
rce.SetFragmentBytes(unsafe.Pointer(&sourceSize[0]), unsafe.Sizeof(sourceSize), 2)
if colorM != nil {
esBody, esTranslate := colorM.UnsafeElements()
rce.SetFragmentBytes(unsafe.Pointer(&esBody[0]), unsafe.Sizeof(esBody[0])*uintptr(len(esBody)), 3)
rce.SetFragmentBytes(unsafe.Pointer(&esTranslate[0]), unsafe.Sizeof(esTranslate[0])*uintptr(len(esTranslate)), 4)
}
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scale := float32(d.dst.width) / float32(d.src.width)
rce.SetFragmentBytes(unsafe.Pointer(&scale), unsafe.Sizeof(scale), 5)
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if d.src != nil {
rce.SetFragmentTexture(d.src.texture, 0)
} else {
rce.SetFragmentTexture(mtl.Texture{}, 0)
}
rce.DrawIndexedPrimitives(mtl.PrimitiveTypeTriangle, indexLen, mtl.IndexTypeUInt16, d.ib, indexOffset*2)
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rce.EndEncoding()
return nil
}); err != nil {
return err
}
return nil
}
func (d *Driver) ResetSource() {
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d.t.Call(func() error {
d.src = nil
return nil
})
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}
func (d *Driver) SetVsyncEnabled(enabled bool) {
d.view.setDisplaySyncEnabled(enabled)
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}
func (d *Driver) VDirection() driver.VDirection {
return driver.VUpward
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}
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func (d *Driver) NeedsRestoring() bool {
return false
}
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func (d *Driver) IsGL() bool {
return false
}
func (d *Driver) HasHighPrecisionFloat() bool {
return true
}
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type Image struct {
driver *Driver
width int
height int
screen bool
texture mtl.Texture
}
// viewportSize must be called from the main thread.
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func (i *Image) viewportSize() (int, int) {
if i.screen {
return i.width, i.height
}
return graphics.InternalImageSize(i.width), graphics.InternalImageSize(i.height)
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}
func (i *Image) Dispose() {
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i.driver.t.Call(func() error {
if i.texture != (mtl.Texture{}) {
i.texture.Release()
i.texture = mtl.Texture{}
}
return nil
})
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}
func (i *Image) IsInvalidated() bool {
// TODO: Does Metal cause context lost?
// https://developer.apple.com/documentation/metal/mtlresource/1515898-setpurgeablestate
// https://developer.apple.com/documentation/metal/mtldevicenotificationhandler
return false
}
func (i *Image) syncTexture() {
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i.driver.t.Call(func() error {
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if i.driver.cb != (mtl.CommandBuffer{}) {
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panic("metal: command buffer must be empty at syncTexture: flush is not called yet?")
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}
cb := i.driver.cq.MakeCommandBuffer()
bce := cb.MakeBlitCommandEncoder()
bce.SynchronizeTexture(i.texture, 0, 0)
bce.EndEncoding()
cb.Commit()
cb.WaitUntilCompleted()
return nil
})
}
func (i *Image) Pixels() ([]byte, error) {
i.driver.flush(true, false)
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i.syncTexture()
b := make([]byte, 4*i.width*i.height)
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i.driver.t.Call(func() error {
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i.texture.GetBytes(&b[0], uintptr(4*i.width), mtl.Region{
Size: mtl.Size{i.width, i.height, 1},
}, 0)
return nil
})
return b, nil
}
func (i *Image) SetAsDestination() {
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i.driver.t.Call(func() error {
i.driver.dst = i
return nil
})
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}
func (i *Image) SetAsSource() {
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i.driver.t.Call(func() error {
i.driver.src = i
return nil
})
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}
func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
i.driver.flush(true, false)
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i.driver.t.Call(func() error {
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i.texture.ReplaceRegion(mtl.Region{
Origin: mtl.Origin{x, y, 0},
Size: mtl.Size{width, height, 1},
}, 0, unsafe.Pointer(&pixels[0]), 4*width)
return nil
})
}