/* RetroArch - A frontend for libretro.
* Copyright (C) 2018-2019 - Stuart Carnie
* Copyright (C) 2011-2017 - Daniel De Matteis
*
* RetroArch is free software: you can redistribute it and/or modify it under the terms
* of the GNU General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with RetroArch.
* If not, see <http://www.gnu.org/licenses/>.
*/
#import <Foundation/Foundation.h>
#import <Metal/Metal.h>
#import <QuartzCore/QuartzCore.h>
#import <memory.h>
#import <stddef.h>
#include <simd/simd.h>
#import <gfx/video_frame.h>
#import "metal_common.h"
#include "metal/Context.h"
#include "../../ui/drivers/cocoa/cocoa_common.h"
#ifdef HAVE_REWIND
#include "../../managers/state_manager.h"
#endif
#ifdef HAVE_MENU
#include "../../menu/menu_driver.h"
#endif
#ifdef HAVE_GFX_WIDGETS
#include "../gfx_widgets.h"
#endif
#define STRUCT_ASSIGN(x, y) \
{ \
NSObject * __y = y; \
if (x != nil) { \
NSObject * __foo = (__bridge_transfer NSObject *)(__bridge void *)(x); \
__foo = nil; \
x = (__bridge __typeof__(x))nil; \
} \
if (__y != nil) \
x = (__bridge __typeof__(x))(__bridge_retained void *)((NSObject *)__y); \
}
@implementation MetalView
#if !defined(HAVE_COCOATOUCH)
- (void)keyDown:(NSEvent*)theEvent
{
}
#endif
/* Stop the annoying sound when pressing a key. */
- (BOOL)acceptsFirstResponder
{
return YES;
}
- (BOOL)isFlipped
{
return YES;
}
@end
#pragma mark - private categories
@interface FrameView()
@property (nonatomic, readwrite) video_viewport_t *viewport;
- (instancetype)initWithDescriptor:(ViewDescriptor *)td context:(Context *)context;
- (void)drawWithContext:(Context *)ctx;
- (void)drawWithEncoder:(id<MTLRenderCommandEncoder>)rce;
@end
@interface MetalMenu()
@property (nonatomic, readonly) TexturedView *view;
- (instancetype)initWithContext:(Context *)context;
@end
@interface Overlay()
- (instancetype)initWithContext:(Context *)context;
- (void)drawWithEncoder:(id<MTLRenderCommandEncoder>)rce;
@end
@implementation MetalDriver
{
FrameView *_frameView;
MetalMenu *_menu;
Overlay *_overlay;
video_info_t _video;
id<MTLDevice> _device;
id<MTLLibrary> _library;
Context *_context;
CAMetalLayer *_layer;
// render target layer state
id<MTLRenderPipelineState> _t_pipelineState;
id<MTLRenderPipelineState> _t_pipelineStateNoAlpha;
id<MTLSamplerState> _samplerStateLinear;
id<MTLSamplerState> _samplerStateNearest;
// other state
Uniforms _viewportMVP;
}
- (instancetype)initWithVideo:(const video_info_t *)video
input:(input_driver_t **)input
inputData:(void **)inputData
{
if (self = [super init])
{
_device = MTLCreateSystemDefaultDevice();
MetalView *view = (MetalView *)apple_platform.renderView;
view.device = _device;
view.delegate = self;
_layer = (CAMetalLayer *)view.layer;
if (![self _initMetal])
{
return nil;
}
_video = *video;
_viewport = (video_viewport_t *)calloc(1, sizeof(video_viewport_t));
_viewportMVP.projectionMatrix = matrix_proj_ortho(0, 1, 0, 1);
_keepAspect = _video.force_aspect;
gfx_ctx_mode_t mode = {
.width = _video.width,
.height = _video.height,
.fullscreen = _video.fullscreen,
};
if (mode.width == 0 || mode.height == 0)
{
// 0 indicates full screen, so we'll use the view's dimensions, which should already be full screen
// If this turns out to be the wrong assumption, we can use NSScreen to query the dimensions
CGSize size = view.frame.size;
mode.width = (unsigned int)size.width;
mode.height = (unsigned int)size.height;
}
[apple_platform setVideoMode:mode];
*input = NULL;
*inputData = NULL;
// graphics display driver
_display = [[MenuDisplay alloc] initWithContext:_context];
// menu view
_menu = [[MetalMenu alloc] initWithContext:_context];
// frame buffer view
{
ViewDescriptor *vd = [ViewDescriptor new];
vd.format = _video.rgb32 ? RPixelFormatBGRX8Unorm : RPixelFormatB5G6R5Unorm;
vd.size = CGSizeMake(video->width, video->height);
vd.filter = _video.smooth ? RTextureFilterLinear : RTextureFilterNearest;
_frameView = [[FrameView alloc] initWithDescriptor:vd context:_context];
_frameView.viewport = _viewport;
[_frameView setFilteringIndex:0 smooth:video->smooth];
}
// overlay view
_overlay = [[Overlay alloc] initWithContext:_context];
font_driver_init_osd((__bridge void *)self,
video,
false,
video->is_threaded,
FONT_DRIVER_RENDER_METAL_API);
}
return self;
}
- (void)dealloc
{
RARCH_LOG("[MetalDriver]: destroyed\n");
if (_viewport)
{
free(_viewport);
_viewport = nil;
}
font_driver_free_osd();
}
- (bool)_initMetal
{
_library = [_device newDefaultLibrary];
_context = [[Context alloc] initWithDevice:_device
layer:_layer
library:_library];
{
MTLVertexDescriptor *vd = [MTLVertexDescriptor new];
vd.attributes[0].offset = 0;
vd.attributes[0].format = MTLVertexFormatFloat3;
vd.attributes[1].offset = offsetof(Vertex, texCoord);
vd.attributes[1].format = MTLVertexFormatFloat2;
vd.layouts[0].stride = sizeof(Vertex);
MTLRenderPipelineDescriptor *psd = [MTLRenderPipelineDescriptor new];
psd.label = @"Pipeline+Alpha";
MTLRenderPipelineColorAttachmentDescriptor *ca = psd.colorAttachments[0];
ca.pixelFormat = _layer.pixelFormat;
ca.blendingEnabled = YES;
ca.sourceAlphaBlendFactor = MTLBlendFactorSourceAlpha;
ca.sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
ca.destinationAlphaBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
ca.destinationRGBBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
psd.sampleCount = 1;
psd.vertexDescriptor = vd;
psd.vertexFunction = [_library newFunctionWithName:@"basic_vertex_proj_tex"];
psd.fragmentFunction = [_library newFunctionWithName:@"basic_fragment_proj_tex"];
NSError *err;
_t_pipelineState = [_device newRenderPipelineStateWithDescriptor:psd error:&err];
if (err != nil)
{
RARCH_ERR("[Metal]: error creating pipeline state %s\n", err.localizedDescription.UTF8String);
return NO;
}
psd.label = @"Pipeline+No Alpha";
ca.blendingEnabled = NO;
_t_pipelineStateNoAlpha = [_device newRenderPipelineStateWithDescriptor:psd error:&err];
if (err != nil)
{
RARCH_ERR("[Metal]: error creating pipeline state (no alpha) %s\n", err.localizedDescription.UTF8String);
return NO;
}
}
{
MTLSamplerDescriptor *sd = [MTLSamplerDescriptor new];
_samplerStateNearest = [_device newSamplerStateWithDescriptor:sd];
sd.minFilter = MTLSamplerMinMagFilterLinear;
sd.magFilter = MTLSamplerMinMagFilterLinear;
_samplerStateLinear = [_device newSamplerStateWithDescriptor:sd];
}
return YES;
}
- (void)setViewportWidth:(unsigned)width height:(unsigned)height forceFull:(BOOL)forceFull allowRotate:(BOOL)allowRotate
{
#if 0
RARCH_LOG("[Metal]: setViewportWidth size %dx%d\n", width, height);
#endif
_viewport->full_width = width;
_viewport->full_height = height;
video_driver_set_size(_viewport->full_width, _viewport->full_height);
_layer.drawableSize = CGSizeMake(width, height);
video_driver_update_viewport(_viewport, forceFull, _keepAspect);
// update matrix
_context.viewport = _viewport;
_viewportMVP.outputSize = simd_make_float2(_viewport->full_width, _viewport->full_height);
}
#pragma mark - video
- (void)setVideo:(const video_info_t *)video
{
}
- (bool)renderFrame:(const void *)frame
data:(void*)data
width:(unsigned)width
height:(unsigned)height
frameCount:(uint64_t)frameCount
pitch:(unsigned)pitch
msg:(const char *)msg
info:(video_frame_info_t *)video_info
{
@autoreleasepool
{
bool statistics_show = video_info->statistics_show;
[self _beginFrame];
_frameView.frameCount = frameCount;
if (frame && width && height)
{
_frameView.size = CGSizeMake(width, height);
[_frameView updateFrame:frame pitch:pitch];
}
[self _drawCore];
[self _drawMenu:video_info];
id<MTLRenderCommandEncoder> rce = _context.rce;
#ifdef HAVE_OVERLAY
if (_overlay.enabled)
{
[rce pushDebugGroup:@"overlay"];
[_context resetRenderViewport:_overlay.fullscreen ? kFullscreenViewport : kVideoViewport];
[rce setRenderPipelineState:[_context getStockShader:VIDEO_SHADER_STOCK_BLEND blend:YES]];
[rce setVertexBytes:_context.uniforms length:sizeof(*_context.uniforms) atIndex:BufferIndexUniforms];
[rce setFragmentSamplerState:_samplerStateLinear atIndex:SamplerIndexDraw];
[_overlay drawWithEncoder:rce];
[rce popDebugGroup];
}
#endif
if (statistics_show)
{
struct font_params *osd_params = (struct font_params *)&video_info->osd_stat_params;
if (osd_params)
{
[rce pushDebugGroup:@"video stats"];
font_driver_render_msg(data, video_info->stat_text, osd_params, NULL);
[rce popDebugGroup];
}
}
#ifdef HAVE_GFX_WIDGETS
[rce pushDebugGroup:@"display widgets"];
if (video_info->widgets_active)
gfx_widgets_frame(video_info);
[rce popDebugGroup];
#endif
if (msg && *msg)
{
[rce pushDebugGroup:@"message"];
[self _renderMessage:msg data:data];
[rce popDebugGroup];
}
[self _endFrame];
}
return YES;
}
- (void)_renderMessage:(const char *)msg
data:(void*)data
{
settings_t *settings = config_get_ptr();
bool msg_bgcolor_enable = settings->bools.video_msg_bgcolor_enable;
if (msg_bgcolor_enable)
{
float r, g, b, a;
int msg_width =
font_driver_get_message_width(NULL, msg, (unsigned)strlen(msg), 1.0f);
float font_size = settings->floats.video_font_size;
unsigned bgcolor_red
= settings->uints.video_msg_bgcolor_red;
unsigned bgcolor_green
= settings->uints.video_msg_bgcolor_green;
unsigned bgcolor_blue
= settings->uints.video_msg_bgcolor_blue;
float bgcolor_opacity = settings->floats.video_msg_bgcolor_opacity;
float x = settings->floats.video_msg_pos_x;
float y = 1.0f - settings->floats.video_msg_pos_y;
float width = msg_width / (float)_viewport->full_width;
float height = font_size / (float)_viewport->full_height;
float x2 = 0.005f; /* extend background around text */
float y2 = 0.005f;
y -= height;
x -= x2;
y -= y2;
width += x2;
height += y2;
r = bgcolor_red / 255.0f;
g = bgcolor_green / 255.0f;
b = bgcolor_blue / 255.0f;
a = bgcolor_opacity;
[_context resetRenderViewport:kFullscreenViewport];
[_context drawQuadX:x y:y w:width h:height r:r g:g b:b a:a];
}
font_driver_render_msg(data, msg, NULL, NULL);
}
- (void)_beginFrame
{
video_viewport_t vp = *_viewport;
video_driver_update_viewport(_viewport, NO, _keepAspect);
if (memcmp(&vp, _viewport, sizeof(vp)) != 0)
_context.viewport = _viewport;
[_context begin];
}
- (void)_drawCore
{
id<MTLRenderCommandEncoder> rce = _context.rce;
/* draw back buffer */
[rce pushDebugGroup:@"core frame"];
[_frameView drawWithContext:_context];
if ((_frameView.drawState & ViewDrawStateEncoder) != 0)
{
[rce setVertexBytes:_context.uniforms length:sizeof(*_context.uniforms) atIndex:BufferIndexUniforms];
[rce setRenderPipelineState:_t_pipelineStateNoAlpha];
if (_frameView.filter == RTextureFilterNearest)
{
[rce setFragmentSamplerState:_samplerStateNearest atIndex:SamplerIndexDraw];
}
else
{
[rce setFragmentSamplerState:_samplerStateLinear atIndex:SamplerIndexDraw];
}
[_frameView drawWithEncoder:rce];
}
[rce popDebugGroup];
}
- (void)_drawMenu:(video_frame_info_t *)video_info
{
bool menu_is_alive = video_info->menu_is_alive;
if (!_menu.enabled)
return;
id<MTLRenderCommandEncoder> rce = _context.rce;
if (_menu.hasFrame)
{
[rce pushDebugGroup:@"menu frame"];
[_menu.view drawWithContext:_context];
[rce setVertexBytes:_context.uniforms length:sizeof(*_context.uniforms) atIndex:BufferIndexUniforms];
[rce setRenderPipelineState:_t_pipelineState];
if (_menu.view.filter == RTextureFilterNearest)
{
[rce setFragmentSamplerState:_samplerStateNearest atIndex:SamplerIndexDraw];
}
else
{
[rce setFragmentSamplerState:_samplerStateLinear atIndex:SamplerIndexDraw];
}
[_menu.view drawWithEncoder:rce];
[rce popDebugGroup];
}
#if defined(HAVE_MENU)
else
{
[rce pushDebugGroup:@"menu"];
[_context resetRenderViewport:kFullscreenViewport];
menu_driver_frame(menu_is_alive, video_info);
[rce popDebugGroup];
}
#endif
}
- (void)_endFrame
{
[_context end];
}
- (void)setNeedsResize
{
// TODO(sgc): resize all drawables
}
- (void)setRotation:(unsigned)rotation
{
[_context setRotation:rotation];
}
- (Uniforms *)viewportMVP
{
return &_viewportMVP;
}
#pragma mark - MTKViewDelegate
- (void)mtkView:(MTKView *)view drawableSizeWillChange:(CGSize)size
{
NSLog(@"mtkView drawableSizeWillChange to: %f x %f",size.width,size.height);
#ifdef HAVE_COCOATOUCH
CGFloat scale = [[UIScreen mainScreen] scale];
[self setViewportWidth:(unsigned int)view.bounds.size.width*scale height:(unsigned int)view.bounds.size.height*scale forceFull:NO allowRotate:YES];
#else
[self setViewportWidth:(unsigned int)size.width height:(unsigned int)size.height forceFull:NO allowRotate:YES];
#endif
}
- (void)drawInMTKView:(MTKView *)view
{
}
@end
@implementation MetalMenu
{
Context *_context;
TexturedView *_view;
bool _enabled;
}
- (instancetype)initWithContext:(Context *)context
{
if (self = [super init])
{
_context = context;
}
return self;
}
- (bool)hasFrame
{
return _view != nil;
}
- (void)setEnabled:(bool)enabled
{
if (_enabled == enabled) return;
_enabled = enabled;
_view.visible = enabled;
}
- (bool)enabled
{
return _enabled;
}
- (void)updateWidth:(int)width
height:(int)height
format:(RPixelFormat)format
filter:(RTextureFilter)filter
{
CGSize size = CGSizeMake(width, height);
if (_view)
{
if (!(CGSizeEqualToSize(_view.size, size) &&
_view.format == format &&
_view.filter == filter))
{
_view = nil;
}
}
if (!_view)
{
ViewDescriptor *vd = [ViewDescriptor new];
vd.format = format;
vd.filter = filter;
vd.size = size;
_view = [[TexturedView alloc] initWithDescriptor:vd context:_context];
_view.visible = _enabled;
}
}
- (void)updateFrame:(void const *)source
{
[_view updateFrame:source pitch:RPixelFormatToBPP(_view.format) * (NSUInteger)_view.size.width];
}
@end
#pragma mark - FrameView
#define MTLALIGN(x) __attribute__((aligned(x)))
typedef struct
{
float x;
float y;
float z;
float w;
} float4_t;
typedef struct texture
{
__unsafe_unretained id<MTLTexture> view;
float4_t size_data;
} texture_t;
typedef struct MTLALIGN(16)
{
matrix_float4x4 mvp;
struct
{
texture_t texture[GFX_MAX_FRAME_HISTORY + 1];
MTLViewport viewport;
float4_t output_size;
} frame;
struct
{
__unsafe_unretained id<MTLBuffer> buffers[SLANG_CBUFFER_MAX];
texture_t rt;
texture_t feedback;
uint32_t frame_count;
int32_t frame_direction;
pass_semantics_t semantics;
MTLViewport viewport;
__unsafe_unretained id<MTLRenderPipelineState> _state;
} pass[GFX_MAX_SHADERS];
texture_t luts[GFX_MAX_TEXTURES];
} engine_t;
@implementation FrameView
{
Context *_context;
id<MTLTexture> _texture; // final render texture
Vertex _v[4];
VertexSlang _vertex[4];
CGSize _size; // size of view in pixels
CGRect _frame;
NSUInteger _bpp;
id<MTLTexture> _src; // src texture
bool _srcDirty;
id<MTLSamplerState> _samplers[RARCH_FILTER_MAX][RARCH_WRAP_MAX];
struct video_shader *_shader;
engine_t _engine;
bool resize_render_targets;
bool init_history;
video_viewport_t *_viewport;
}
- (instancetype)initWithDescriptor:(ViewDescriptor *)d context:(Context *)c
{
self = [super init];
if (self)
{
_context = c;
_format = d.format;
_bpp = RPixelFormatToBPP(_format);
_filter = d.filter;
if (_format == RPixelFormatBGRA8Unorm || _format == RPixelFormatBGRX8Unorm)
{
_drawState = ViewDrawStateEncoder;
}
else
{
_drawState = ViewDrawStateAll;
}
_visible = YES;
_engine.mvp = matrix_proj_ortho(0, 1, 0, 1);
[self _initSamplers];
self.size = d.size;
self.frame = CGRectMake(0, 0, 1, 1);
resize_render_targets = YES;
// init slang vertex buffer
VertexSlang v[4] = {
{simd_make_float4(0, 1, 0, 1), simd_make_float2(0, 1)},
{simd_make_float4(1, 1, 0, 1), simd_make_float2(1, 1)},
{simd_make_float4(0, 0, 0, 1), simd_make_float2(0, 0)},
{simd_make_float4(1, 0, 0, 1), simd_make_float2(1, 0)},
};
memcpy(_vertex, v, sizeof(_vertex));
}
return self;
}
- (void)_initSamplers
{
MTLSamplerDescriptor *sd = [MTLSamplerDescriptor new];
/* Initialize samplers */
for (unsigned i = 0; i < RARCH_WRAP_MAX; i++)
{
switch (i)
{
case RARCH_WRAP_BORDER:
#if defined(HAVE_COCOATOUCH)
sd.sAddressMode = MTLSamplerAddressModeClampToZero;
#else
sd.sAddressMode = MTLSamplerAddressModeClampToBorderColor;
#endif
break;
case RARCH_WRAP_EDGE:
sd.sAddressMode = MTLSamplerAddressModeClampToEdge;
break;
case RARCH_WRAP_REPEAT:
sd.sAddressMode = MTLSamplerAddressModeRepeat;
break;
case RARCH_WRAP_MIRRORED_REPEAT:
sd.sAddressMode = MTLSamplerAddressModeMirrorRepeat;
break;
default:
continue;
}
sd.tAddressMode = sd.sAddressMode;
sd.rAddressMode = sd.sAddressMode;
sd.minFilter = MTLSamplerMinMagFilterLinear;
sd.magFilter = MTLSamplerMinMagFilterLinear;
id<MTLSamplerState> ss = [_context.device newSamplerStateWithDescriptor:sd];
_samplers[RARCH_FILTER_LINEAR][i] = ss;
sd.minFilter = MTLSamplerMinMagFilterNearest;
sd.magFilter = MTLSamplerMinMagFilterNearest;
ss = [_context.device newSamplerStateWithDescriptor:sd];
_samplers[RARCH_FILTER_NEAREST][i] = ss;
}
}
- (void)setFilteringIndex:(int)index smooth:(bool)smooth
{
for (int i = 0; i < RARCH_WRAP_MAX; i++)
{
if (smooth)
_samplers[RARCH_FILTER_UNSPEC][i] = _samplers[RARCH_FILTER_LINEAR][i];
else
_samplers[RARCH_FILTER_UNSPEC][i] = _samplers[RARCH_FILTER_NEAREST][i];
}
}
- (void)setSize:(CGSize)size
{
if (CGSizeEqualToSize(_size, size))
{
return;
}
_size = size;
resize_render_targets = YES;
if (_format != RPixelFormatBGRA8Unorm && _format != RPixelFormatBGRX8Unorm)
{
MTLTextureDescriptor *td = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatR16Uint
width:(NSUInteger)size.width
height:(NSUInteger)size.height
mipmapped:NO];
_src = [_context.device newTextureWithDescriptor:td];
}
}
- (CGSize)size
{
return _size;
}
- (void)setFrame:(CGRect)frame
{
if (CGRectEqualToRect(_frame, frame))
{
return;
}
_frame = frame;
// update vertices
CGPoint o = frame.origin;
CGSize s = frame.size;
CGFloat l = o.x;
CGFloat t = o.y;
CGFloat r = o.x + s.width;
CGFloat b = o.y + s.height;
Vertex v[4] = {
{simd_make_float3(l, b, 0), simd_make_float2(0, 1)},
{simd_make_float3(r, b, 0), simd_make_float2(1, 1)},
{simd_make_float3(l, t, 0), simd_make_float2(0, 0)},
{simd_make_float3(r, t, 0), simd_make_float2(1, 0)},
};
memcpy(_v, v, sizeof(_v));
}
- (CGRect)frame
{
return _frame;
}
- (void)_convertFormat
{
if (_format == RPixelFormatBGRA8Unorm || _format == RPixelFormatBGRX8Unorm)
return;
if (!_srcDirty)
return;
[_context convertFormat:_format from:_src to:_texture];
_srcDirty = NO;
}
- (void)_updateHistory
{
if (_shader)
{
if (_shader->history_size)
{
if (init_history)
[self _initHistory];
else
{
int k;
/* todo: what about frame-duping ?
* maybe clone d3d10_texture_t with AddRef */
texture_t tmp = _engine.frame.texture[_shader->history_size];
for (k = _shader->history_size; k > 0; k--)
_engine.frame.texture[k] = _engine.frame.texture[k - 1];
_engine.frame.texture[0] = tmp;
}
}
}
/* either no history, or we moved a texture of a different size in the front slot */
if (_engine.frame.texture[0].size_data.x != _size.width ||
_engine.frame.texture[0].size_data.y != _size.height)
{
MTLTextureDescriptor *td = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatBGRA8Unorm
width:(NSUInteger)_size.width
height:(NSUInteger)_size.height
mipmapped:false];
td.usage = MTLTextureUsageShaderRead | MTLTextureUsageShaderWrite;
[self _initTexture:&_engine.frame.texture[0] withDescriptor:td];
}
}
- (bool)readViewport:(uint8_t *)buffer isIdle:(bool)isIdle
{
RARCH_LOG("[Metal]: readViewport is_idle = %s\n", isIdle ? "YES" : "NO");
bool enabled = _context.captureEnabled;
if (!enabled)
_context.captureEnabled = YES;
video_driver_cached_frame();
bool res = [_context readBackBuffer:buffer];
if (!enabled)
_context.captureEnabled = NO;
return res;
}
- (void)updateFrame:(void const *)src pitch:(NSUInteger)pitch
{
if (_shader && (_engine.frame.output_size.x != _viewport->width ||
_engine.frame.output_size.y != _viewport->height))
{
resize_render_targets = YES;
}
_engine.frame.viewport.originX = _viewport->x;
_engine.frame.viewport.originY = _viewport->y;
_engine.frame.viewport.width = _viewport->width;
_engine.frame.viewport.height = _viewport->height;
_engine.frame.viewport.znear = 0.0f;
_engine.frame.viewport.zfar = 1.0f;
_engine.frame.output_size.x = _viewport->width;
_engine.frame.output_size.y = _viewport->height;
_engine.frame.output_size.z = 1.0f / _viewport->width;
_engine.frame.output_size.w = 1.0f / _viewport->height;
if (resize_render_targets)
{
[self _updateRenderTargets];
}
[self _updateHistory];
if (_format == RPixelFormatBGRA8Unorm || _format == RPixelFormatBGRX8Unorm)
{
id<MTLTexture> tex = _engine.frame.texture[0].view;
[tex replaceRegion:MTLRegionMake2D(0, 0, (NSUInteger)_size.width, (NSUInteger)_size.height)
mipmapLevel:0 withBytes:src
bytesPerRow:pitch];
}
else
{
[_src replaceRegion:MTLRegionMake2D(0, 0, (NSUInteger)_size.width, (NSUInteger)_size.height)
mipmapLevel:0 withBytes:src
bytesPerRow:(NSUInteger)(pitch)];
_srcDirty = YES;
}
}
- (void)_initTexture:(texture_t *)t withDescriptor:(MTLTextureDescriptor *)td
{
STRUCT_ASSIGN(t->view, [_context.device newTextureWithDescriptor:td]);
t->size_data.x = td.width;
t->size_data.y = td.height;
t->size_data.z = 1.0f / td.width;
t->size_data.w = 1.0f / td.height;
}
- (void)_initHistory
{
MTLTextureDescriptor *td = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatBGRA8Unorm
width:(NSUInteger)_size.width
height:(NSUInteger)_size.height
mipmapped:false];
td.usage = MTLTextureUsageShaderRead | MTLTextureUsageShaderWrite | MTLTextureUsageRenderTarget;
for (int i = 0; i < _shader->history_size + 1; i++)
{
[self _initTexture:&_engine.frame.texture[i] withDescriptor:td];
}
init_history = NO;
}
- (void)drawWithEncoder:(id<MTLRenderCommandEncoder>)rce
{
if (_texture)
{
[rce setViewport:_engine.frame.viewport];
[rce setVertexBytes:&_v length:sizeof(_v) atIndex:BufferIndexPositions];
[rce setFragmentTexture:_texture atIndex:TextureIndexColor];
[rce drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4];
}
}
- (void)drawWithContext:(Context *)ctx
{
_texture = _engine.frame.texture[0].view;
[self _convertFormat];
if (!_shader || _shader->passes == 0)
{
return;
}
for (unsigned i = 0; i < _shader->passes; i++)
{
if (_shader->pass[i].feedback)
{
texture_t tmp = _engine.pass[i].feedback;
_engine.pass[i].feedback = _engine.pass[i].rt;
_engine.pass[i].rt = tmp;
}
}
id<MTLCommandBuffer> cb = ctx.blitCommandBuffer;
[cb pushDebugGroup:@"shaders"];
MTLRenderPassDescriptor *rpd = [MTLRenderPassDescriptor new];
rpd.colorAttachments[0].loadAction = MTLLoadActionDontCare;
rpd.colorAttachments[0].storeAction = MTLStoreActionStore;
for (unsigned i = 0; i < _shader->passes; i++)
{
id<MTLRenderCommandEncoder> rce = nil;
BOOL backBuffer = (_engine.pass[i].rt.view == nil);
if (backBuffer)
{
rce = _context.rce;
}
else
{
rpd.colorAttachments[0].texture = _engine.pass[i].rt.view;
rce = [cb renderCommandEncoderWithDescriptor:rpd];
}
[rce setRenderPipelineState:_engine.pass[i]._state];
NSURL *shaderPath = [NSURL fileURLWithPath:_engine.pass[i]._state.label];
rce.label = shaderPath.lastPathComponent.stringByDeletingPathExtension;
_engine.pass[i].frame_count = (uint32_t)_frameCount;
if (_shader->pass[i].frame_count_mod)
_engine.pass[i].frame_count %= _shader->pass[i].frame_count_mod;
#ifdef HAVE_REWIND
if (state_manager_frame_is_reversed())
{
_engine.pass[i].frame_direction = -1;
}
else
#else
{
_engine.pass[i].frame_direction = 1;
}
#endif
for (unsigned j = 0; j < SLANG_CBUFFER_MAX; j++)
{
id<MTLBuffer> buffer = _engine.pass[i].buffers[j];
cbuffer_sem_t *buffer_sem = &_engine.pass[i].semantics.cbuffers[j];
if (buffer_sem->stage_mask && buffer_sem->uniforms)
{
void *data = buffer.contents;
uniform_sem_t *uniform = buffer_sem->uniforms;
while (uniform->size)
{
if (uniform->data)
memcpy((uint8_t *)data + uniform->offset, uniform->data, uniform->size);
uniform++;
}
if (buffer_sem->stage_mask & SLANG_STAGE_VERTEX_MASK)
[rce setVertexBuffer:buffer offset:0 atIndex:buffer_sem->binding];
if (buffer_sem->stage_mask & SLANG_STAGE_FRAGMENT_MASK)
[rce setFragmentBuffer:buffer offset:0 atIndex:buffer_sem->binding];
#if !defined(HAVE_COCOATOUCH)
[buffer didModifyRange:NSMakeRange(0, buffer.length)];
#endif
}
}
__unsafe_unretained id<MTLTexture> textures[SLANG_NUM_BINDINGS] = {NULL};
id<MTLSamplerState> samplers[SLANG_NUM_BINDINGS] = {NULL};
texture_sem_t *texture_sem = _engine.pass[i].semantics.textures;
while (texture_sem->stage_mask)
{
int binding = texture_sem->binding;
id<MTLTexture> tex = (__bridge id<MTLTexture>)*(void **)texture_sem->texture_data;
textures[binding] = tex;
samplers[binding] = _samplers[texture_sem->filter][texture_sem->wrap];
texture_sem++;
}
if (backBuffer)
{
[rce setViewport:_engine.frame.viewport];
}
else
{
[rce setViewport:_engine.pass[i].viewport];
}
[rce setFragmentTextures:textures withRange:NSMakeRange(0, SLANG_NUM_BINDINGS)];
[rce setFragmentSamplerStates:samplers withRange:NSMakeRange(0, SLANG_NUM_BINDINGS)];
[rce setVertexBytes:_vertex length:sizeof(_vertex) atIndex:4];
[rce drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4];
if (!backBuffer)
{
[rce endEncoding];
}
_texture = _engine.pass[i].rt.view;
}
if (_texture == nil)
_drawState = ViewDrawStateContext;
else
_drawState = ViewDrawStateAll;
[cb popDebugGroup];
}
- (void)_updateRenderTargets
{
if (!_shader || !resize_render_targets) return;
// release existing targets
for (int i = 0; i < _shader->passes; i++)
{
STRUCT_ASSIGN(_engine.pass[i].rt.view, nil);
STRUCT_ASSIGN(_engine.pass[i].feedback.view, nil);
memset(&_engine.pass[i].rt, 0, sizeof(_engine.pass[i].rt));
memset(&_engine.pass[i].feedback, 0, sizeof(_engine.pass[i].feedback));
}
NSUInteger width = (NSUInteger)_size.width, height = (NSUInteger)_size.height;
for (unsigned i = 0; i < _shader->passes; i++)
{
struct video_shader_pass *shader_pass = &_shader->pass[i];
if (shader_pass->fbo.valid)
{
switch (shader_pass->fbo.type_x)
{
case RARCH_SCALE_INPUT:
width *= shader_pass->fbo.scale_x;
break;
case RARCH_SCALE_VIEWPORT:
width = (NSUInteger)(_viewport->width * shader_pass->fbo.scale_x);
break;
case RARCH_SCALE_ABSOLUTE:
width = shader_pass->fbo.abs_x;
break;
default:
break;
}
if (!width)
width = _viewport->width;
switch (shader_pass->fbo.type_y)
{
case RARCH_SCALE_INPUT:
height *= shader_pass->fbo.scale_y;
break;
case RARCH_SCALE_VIEWPORT:
height = (NSUInteger)(_viewport->height * shader_pass->fbo.scale_y);
break;
case RARCH_SCALE_ABSOLUTE:
height = shader_pass->fbo.abs_y;
break;
default:
break;
}
if (!height)
height = _viewport->height;
}
else if (i == (_shader->passes - 1))
{
width = _viewport->width;
height = _viewport->height;
}
RARCH_LOG("[Metal]: Updating framebuffer size %u x %u.\n", width, height);
MTLPixelFormat fmt = SelectOptimalPixelFormat(glslang_format_to_metal(_engine.pass[i].semantics.format));
if ((i != (_shader->passes - 1)) ||
(width != _viewport->width) || (height != _viewport->height) ||
fmt != MTLPixelFormatBGRA8Unorm)
{
_engine.pass[i].viewport.width = width;
_engine.pass[i].viewport.height = height;
_engine.pass[i].viewport.znear = 0.0;
_engine.pass[i].viewport.zfar = 1.0;
MTLTextureDescriptor *td = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:fmt
width:width
height:height
mipmapped:false];
td.storageMode = MTLStorageModePrivate;
td.usage = MTLTextureUsageShaderRead | MTLTextureUsageRenderTarget;
[self _initTexture:&_engine.pass[i].rt withDescriptor:td];
if (shader_pass->feedback)
{
[self _initTexture:&_engine.pass[i].feedback withDescriptor:td];
}
}
else
{
_engine.pass[i].rt.size_data.x = width;
_engine.pass[i].rt.size_data.y = height;
_engine.pass[i].rt.size_data.z = 1.0f / width;
_engine.pass[i].rt.size_data.w = 1.0f / height;
}
}
resize_render_targets = NO;
}
- (void)_freeVideoShader:(struct video_shader *)shader
{
if (!shader)
return;
for (int i = 0; i < GFX_MAX_SHADERS; i++)
{
STRUCT_ASSIGN(_engine.pass[i].rt.view, nil);
STRUCT_ASSIGN(_engine.pass[i].feedback.view, nil);
memset(&_engine.pass[i].rt, 0, sizeof(_engine.pass[i].rt));
memset(&_engine.pass[i].feedback, 0, sizeof(_engine.pass[i].feedback));
STRUCT_ASSIGN(_engine.pass[i]._state, nil);
for (unsigned j = 0; j < SLANG_CBUFFER_MAX; j++)
{
STRUCT_ASSIGN(_engine.pass[i].buffers[j], nil);
}
}
for (int i = 0; i < GFX_MAX_TEXTURES; i++)
{
STRUCT_ASSIGN(_engine.luts[i].view, nil);
}
free(shader);
}
- (BOOL)setShaderFromPath:(NSString *)path
{
[self _freeVideoShader:_shader];
_shader = nil;
config_file_t *conf = video_shader_read_preset(path.UTF8String);
struct video_shader *shader = (struct video_shader *)calloc(1, sizeof(*shader));
settings_t *settings = config_get_ptr();
const char *dir_video_shader = settings->paths.directory_video_shader;
NSString *shadersPath = [NSString stringWithFormat:@"%s/", dir_video_shader];
@try
{
unsigned i;
texture_t *source = NULL;
if (!video_shader_read_conf_preset(conf, shader))
return NO;
source = &_engine.frame.texture[0];
for (i = 0; i < shader->passes; source = &_engine.pass[i++].rt)
{
matrix_float4x4 *mvp = (i == shader->passes-1) ? &_context.uniforms->projectionMatrix : &_engine.mvp;
/* clang-format off */
semantics_map_t semantics_map = {
{
/* Original */
{&_engine.frame.texture[0].view, 0,
&_engine.frame.texture[0].size_data, 0},
/* Source */
{&source->view, 0,
&source->size_data, 0},
/* OriginalHistory */
{&_engine.frame.texture[0].view, sizeof(*_engine.frame.texture),
&_engine.frame.texture[0].size_data, sizeof(*_engine.frame.texture)},
/* PassOutput */
{&_engine.pass[0].rt.view, sizeof(*_engine.pass),
&_engine.pass[0].rt.size_data, sizeof(*_engine.pass)},
/* PassFeedback */
{&_engine.pass[0].feedback.view, sizeof(*_engine.pass),
&_engine.pass[0].feedback.size_data, sizeof(*_engine.pass)},
/* User */
{&_engine.luts[0].view, sizeof(*_engine.luts),
&_engine.luts[0].size_data, sizeof(*_engine.luts)},
},
{
mvp, /* MVP */
&_engine.pass[i].rt.size_data, /* OutputSize */
&_engine.frame.output_size, /* FinalViewportSize */
&_engine.pass[i].frame_count, /* FrameCount */
&_engine.pass[i].frame_direction, /* FrameDirection */
}
};
/* clang-format on */
if (!slang_process(shader, i, RARCH_SHADER_METAL, 20000, &semantics_map, &_engine.pass[i].semantics))
return NO;
#ifdef DEBUG
bool save_msl = true;
#else
bool save_msl = false;
#endif
NSString *vs_src = [NSString stringWithUTF8String:shader->pass[i].source.string.vertex];
NSString *fs_src = [NSString stringWithUTF8String:shader->pass[i].source.string.fragment];
// vertex descriptor
@try
{
NSError *err;
MTLVertexDescriptor *vd = [MTLVertexDescriptor new];
vd.attributes[0].offset = offsetof(VertexSlang, position);
vd.attributes[0].format = MTLVertexFormatFloat4;
vd.attributes[0].bufferIndex = 4;
vd.attributes[1].offset = offsetof(VertexSlang, texCoord);
vd.attributes[1].format = MTLVertexFormatFloat2;
vd.attributes[1].bufferIndex = 4;
vd.layouts[4].stride = sizeof(VertexSlang);
vd.layouts[4].stepFunction = MTLVertexStepFunctionPerVertex;
MTLRenderPipelineDescriptor *psd = [MTLRenderPipelineDescriptor new];
psd.label = [[NSString stringWithUTF8String:shader->pass[i].source.path]
stringByReplacingOccurrencesOfString:shadersPath withString:@""];
MTLRenderPipelineColorAttachmentDescriptor *ca = psd.colorAttachments[0];
ca.pixelFormat = SelectOptimalPixelFormat(glslang_format_to_metal(_engine.pass[i].semantics.format));
/* TODO(sgc): confirm we never need blending for render passes */
ca.blendingEnabled = NO;
ca.sourceAlphaBlendFactor = MTLBlendFactorSourceAlpha;
ca.sourceRGBBlendFactor = MTLBlendFactorSourceAlpha;
ca.destinationAlphaBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
ca.destinationRGBBlendFactor = MTLBlendFactorOneMinusSourceAlpha;
psd.sampleCount = 1;
psd.vertexDescriptor = vd;
id<MTLLibrary> lib = [_context.device newLibraryWithSource:vs_src options:nil error:&err];
if (err != nil)
{
if (lib == nil)
{
save_msl = true;
RARCH_ERR("[Metal]: unable to compile vertex shader: %s\n", err.localizedDescription.UTF8String);
return NO;
}
#if DEBUG
RARCH_WARN("[Metal]: warnings compiling vertex shader: %s\n", err.localizedDescription.UTF8String);
#endif
}
psd.vertexFunction = [lib newFunctionWithName:@"main0"];
lib = [_context.device newLibraryWithSource:fs_src options:nil error:&err];
if (err != nil)
{
if (lib == nil)
{
save_msl = true;
RARCH_ERR("[Metal]: unable to compile fragment shader: %s\n", err.localizedDescription.UTF8String);
return NO;
}
#if DEBUG
RARCH_WARN("[Metal]: warnings compiling fragment shader: %s\n", err.localizedDescription.UTF8String);
#endif
}
psd.fragmentFunction = [lib newFunctionWithName:@"main0"];
STRUCT_ASSIGN(_engine.pass[i]._state,
[_context.device newRenderPipelineStateWithDescriptor:psd error:&err]);
if (err != nil)
{
save_msl = true;
RARCH_ERR("[Metal]: error creating pipeline state for pass %d: %s\n", i,
err.localizedDescription.UTF8String);
return NO;
}
for (unsigned j = 0; j < SLANG_CBUFFER_MAX; j++)
{
unsigned int size = _engine.pass[i].semantics.cbuffers[j].size;
if (size == 0)
continue;
id<MTLBuffer> buf = [_context.device newBufferWithLength:size options:PLATFORM_METAL_RESOURCE_STORAGE_MODE];
STRUCT_ASSIGN(_engine.pass[i].buffers[j], buf);
}
} @finally
{
if (save_msl)
{
NSError *err = nil;
NSString *basePath = [[NSString stringWithUTF8String:shader->pass[i].source.path] stringByDeletingPathExtension];
RARCH_LOG("[Metal]: saving metal shader files to %s\n", basePath.UTF8String);
[vs_src writeToFile:[basePath stringByAppendingPathExtension:@"vs.metal"]
atomically:NO
encoding:NSStringEncodingConversionAllowLossy
error:&err];
if (err != nil)
{
RARCH_ERR("[Metal]: unable to save vertex shader source: %s\n", err.localizedDescription.UTF8String);
}
err = nil;
[fs_src writeToFile:[basePath stringByAppendingPathExtension:@"fs.metal"]
atomically:NO
encoding:NSStringEncodingConversionAllowLossy
error:&err];
if (err != nil)
{
RARCH_ERR("[Metal]: unable to save fragment shader source: %s\n",
err.localizedDescription.UTF8String);
}
}
free(shader->pass[i].source.string.vertex);
free(shader->pass[i].source.string.fragment);
shader->pass[i].source.string.vertex = NULL;
shader->pass[i].source.string.fragment = NULL;
}
}
for (i = 0; i < shader->luts; i++)
{
struct texture_image image = {0};
image.supports_rgba = true;
if (!image_texture_load(&image, shader->lut[i].path))
return NO;
MTLTextureDescriptor *td = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatRGBA8Unorm
width:image.width
height:image.height
mipmapped:shader->lut[i].mipmap];
td.usage = MTLTextureUsageShaderRead;
[self _initTexture:&_engine.luts[i] withDescriptor:td];
[_engine.luts[i].view replaceRegion:MTLRegionMake2D(0, 0, image.width, image.height)
mipmapLevel:0 withBytes:image.pixels
bytesPerRow:4 * image.width];
/* TODO(sgc): generate mip maps */
image_texture_free(&image);
}
video_shader_resolve_current_parameters(conf, shader);
_shader = shader;
shader = nil;
}
@finally
{
if (shader)
{
[self _freeVideoShader:shader];
}
if (conf)
{
config_file_free(conf);
conf = nil;
}
}
resize_render_targets = YES;
init_history = YES;
return YES;
}
@end
@implementation Overlay
{
Context *_context;
NSMutableArray<id<MTLTexture>> *_images;
id<MTLBuffer> _vert;
bool _vertDirty;
}
- (instancetype)initWithContext:(Context *)context
{
if (self = [super init])
{
_context = context;
}
return self;
}
- (bool)loadImages:(const struct texture_image *)images count:(NSUInteger)count
{
[self _freeImages];
_images = [NSMutableArray arrayWithCapacity:count];
NSUInteger needed = sizeof(SpriteVertex) * count * 4;
if (!_vert || _vert.length < needed)
{
_vert = [_context.device newBufferWithLength:needed options:PLATFORM_METAL_RESOURCE_STORAGE_MODE];
}
for (NSUInteger i = 0; i < count; i++)
{
_images[i] = [_context newTexture:images[i] mipmapped:NO];
[self updateVertexX:0 y:0 w:1 h:1 index:i];
[self updateTextureCoordsX:0 y:0 w:1 h:1 index:i];
[self _updateColorRed:1.0 green:1.0 blue:1.0 alpha:1.0 index:i];
}
_vertDirty = YES;
return YES;
}
- (void)drawWithEncoder:(id<MTLRenderCommandEncoder>)rce
{
#if !defined(HAVE_COCOATOUCH)
if (_vertDirty)
{
[_vert didModifyRange:NSMakeRange(0, _vert.length)];
_vertDirty = NO;
}
#endif
NSUInteger count = _images.count;
for (NSUInteger i = 0; i < count; ++i)
{
NSUInteger offset = sizeof(SpriteVertex) * 4 * i;
[rce setVertexBuffer:_vert offset:offset atIndex:BufferIndexPositions];
[rce setFragmentTexture:_images[i] atIndex:TextureIndexColor];
[rce drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4];
}
}
- (SpriteVertex *)_getForIndex:(NSUInteger)index
{
SpriteVertex *pv = (SpriteVertex *)_vert.contents;
return &pv[index * 4];
}
- (void)_updateColorRed:(float)r green:(float)g blue:(float)b alpha:(float)a index:(NSUInteger)index
{
simd_float4 color = simd_make_float4(r, g, b, a);
SpriteVertex *pv = [self _getForIndex:index];
pv[0].color = color;
pv[1].color = color;
pv[2].color = color;
pv[3].color = color;
_vertDirty = YES;
}
- (void)updateAlpha:(float)alpha index:(NSUInteger)index
{
[self _updateColorRed:1.0 green:1.0 blue:1.0 alpha:alpha index:index];
}
- (void)updateVertexX:(float)x y:(float)y w:(float)w h:(float)h index:(NSUInteger)index
{
SpriteVertex *pv = [self _getForIndex:index];
pv[0].position = simd_make_float2(x, y);
pv[1].position = simd_make_float2(x + w, y);
pv[2].position = simd_make_float2(x, y + h);
pv[3].position = simd_make_float2(x + w, y + h);
_vertDirty = YES;
}
- (void)updateTextureCoordsX:(float)x y:(float)y w:(float)w h:(float)h index:(NSUInteger)index
{
SpriteVertex *pv = [self _getForIndex:index];
pv[0].texCoord = simd_make_float2(x, y);
pv[1].texCoord = simd_make_float2(x + w, y);
pv[2].texCoord = simd_make_float2(x, y + h);
pv[3].texCoord = simd_make_float2(x + w, y + h);
_vertDirty = YES;
}
- (void)_freeImages
{
_images = nil;
}
@end
MTLPixelFormat glslang_format_to_metal(glslang_format fmt)
{
#undef FMT2
#define FMT2(x, y) case SLANG_FORMAT_##x: return MTLPixelFormat##y
switch (fmt)
{
FMT2(R8_UNORM, R8Unorm);
FMT2(R8_SINT, R8Sint);
FMT2(R8_UINT, R8Uint);
FMT2(R8G8_UNORM, RG8Unorm);
FMT2(R8G8_SINT, RG8Sint);
FMT2(R8G8_UINT, RG8Uint);
FMT2(R8G8B8A8_UNORM, RGBA8Unorm);
FMT2(R8G8B8A8_SINT, RGBA8Sint);
FMT2(R8G8B8A8_UINT, RGBA8Uint);
FMT2(R8G8B8A8_SRGB, RGBA8Unorm_sRGB);
FMT2(A2B10G10R10_UNORM_PACK32, RGB10A2Unorm);
FMT2(A2B10G10R10_UINT_PACK32, RGB10A2Uint);
FMT2(R16_UINT, R16Uint);
FMT2(R16_SINT, R16Sint);
FMT2(R16_SFLOAT, R16Float);
FMT2(R16G16_UINT, RG16Uint);
FMT2(R16G16_SINT, RG16Sint);
FMT2(R16G16_SFLOAT, RG16Float);
FMT2(R16G16B16A16_UINT, RGBA16Uint);
FMT2(R16G16B16A16_SINT, RGBA16Sint);
FMT2(R16G16B16A16_SFLOAT, RGBA16Float);
FMT2(R32_UINT, R32Uint);
FMT2(R32_SINT, R32Sint);
FMT2(R32_SFLOAT, R32Float);
FMT2(R32G32_UINT, RG32Uint);
FMT2(R32G32_SINT, RG32Sint);
FMT2(R32G32_SFLOAT, RG32Float);
FMT2(R32G32B32A32_UINT, RGBA32Uint);
FMT2(R32G32B32A32_SINT, RGBA32Sint);
FMT2(R32G32B32A32_SFLOAT, RGBA32Float);
case SLANG_FORMAT_UNKNOWN:
default:
break;
}
#undef FMT2
return MTLPixelFormatInvalid;
}
MTLPixelFormat SelectOptimalPixelFormat(MTLPixelFormat fmt)
{
switch (fmt)
{
case MTLPixelFormatRGBA8Unorm:
return MTLPixelFormatBGRA8Unorm;
case MTLPixelFormatRGBA8Unorm_sRGB:
return MTLPixelFormatBGRA8Unorm_sRGB;
default:
return fmt;
}
}