(Metal common) Cleanups

gfx/common/metal_common.m

@@ -57,21 +57,12 @@
 @implementation MetalView
 
 #if !defined(HAVE_COCOATOUCH)
-- (void)keyDown:(NSEvent*)theEvent
-{
-}
+- (void)keyDown:(NSEvent*)theEvent { }
 #endif
 
 /* Stop the annoying sound when pressing a key. */
-- (BOOL)acceptsFirstResponder
-{
-   return YES;
-}
-
-- (BOOL)isFlipped
-{
-   return YES;
-}
+- (BOOL)acceptsFirstResponder { return YES; }
+- (BOOL)isFlipped { return YES; }
 @end
 
 #pragma mark - private categories
@@ -110,14 +101,14 @@
 
    CAMetalLayer *_layer;
 
-   // render target layer state
+   /* Render target layer state */
    id<MTLRenderPipelineState> _t_pipelineState;
    id<MTLRenderPipelineState> _t_pipelineStateNoAlpha;
 
    id<MTLSamplerState> _samplerStateLinear;
    id<MTLSamplerState> _samplerStateNearest;
 
-   // other state
+   /* other state */
    Uniforms _viewportMVP;
 }
 
@@ -134,9 +125,7 @@
       _layer                        = (CAMetalLayer *)view.layer;
 
       if (![self _initMetal])
-      {
          return nil;
-      }
 
       _video                        = *video;
       _viewport                     = (video_viewport_t *)calloc(1, sizeof(video_viewport_t));
@@ -163,14 +152,12 @@
 
       *input         = NULL;
       *inputData     = NULL;
-
-      // graphics display driver
+      /* graphics display driver */
       _display       = [[MenuDisplay alloc] initWithContext:_context];
-
-      // menu view
+      /* menu view */
       _menu          = [[MetalMenu alloc] initWithContext:_context];
 
-      // frame buffer view
+      /* Framebuffer view */
       {
          ViewDescriptor *vd  = [ViewDescriptor new];
          vd.format           = _video.rgb32 ? RPixelFormatBGRX8Unorm : RPixelFormatB5G6R5Unorm;
@@ -181,7 +168,7 @@
          [_frameView setFilteringIndex:0 smooth:video->smooth];
       }
 
-      // overlay view
+      /* Overlay view */
       _overlay = [[Overlay alloc] initWithContext:_context];
 
       font_driver_init_osd((__bridge void *)self,
@@ -211,6 +198,9 @@
                                       library:_library];
 
    {
+      NSError *err;
+      MTLRenderPipelineDescriptor *psd;
+      MTLRenderPipelineColorAttachmentDescriptor *ca;
       MTLVertexDescriptor *vd        = [MTLVertexDescriptor new];
       vd.attributes[0].offset        = 0;
       vd.attributes[0].format        = MTLVertexFormatFloat3;
@@ -218,10 +208,10 @@
       vd.attributes[1].format        = MTLVertexFormatFloat2;
       vd.layouts[0].stride           = sizeof(Vertex);
 
-      MTLRenderPipelineDescriptor *psd = [MTLRenderPipelineDescriptor new];
+      psd                            = [MTLRenderPipelineDescriptor new];
       psd.label                      = @"Pipeline+Alpha";
 
-      MTLRenderPipelineColorAttachmentDescriptor *ca = psd.colorAttachments[0];
+      ca                             = psd.colorAttachments[0];
       ca.pixelFormat                 = _layer.pixelFormat;
       ca.blendingEnabled             = YES;
       ca.sourceAlphaBlendFactor      = MTLBlendFactorSourceAlpha;
@@ -234,7 +224,7 @@
       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)
       {
@@ -271,19 +261,13 @@
    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;
-
+   _context.viewport       = _viewport; /* Update matrix */
    _viewportMVP.outputSize = simd_make_float2(_viewport->full_width, _viewport->full_height);
 }
 
 #pragma mark - video
 
-- (void)setVideo:(const video_info_t *)video
-{
-
-}
+- (void)setVideo:(const video_info_t *)video { }
 
 - (bool)renderFrame:(const void *)frame
                data:(void*)data
@@ -427,13 +411,9 @@
       [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];
@@ -455,13 +435,9 @@
       [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];
    }
@@ -476,31 +452,16 @@
 #endif
 }
 
-- (void)_endFrame
-{
-   [_context end];
-}
-
-- (void)setNeedsResize
-{
-   // TODO(sgc): resize all drawables
-}
-
-- (void)setRotation:(unsigned)rotation
-{
-   [_context setRotation:rotation];
-}
-
-- (Uniforms *)viewportMVP
-{
-   return &_viewportMVP;
-}
+- (void)_endFrame { [_context end]; }
+/* TODO/FIXME (sgc): resize*/
+- (void)setNeedsResize { }
+- (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];
@@ -509,11 +470,7 @@
 #endif
 }
 
-- (void)drawInMTKView:(MTKView *)view
-{
-
-}
-
+- (void)drawInMTKView:(MTKView *)view { }
 @end
 
 @implementation MetalMenu
@@ -526,28 +483,21 @@
 - (instancetype)initWithContext:(Context *)context
 {
    if (self = [super init])
-   {
       _context = context;
-   }
    return self;
 }
 
-- (bool)hasFrame
-{
-   return _view != nil;
-}
+- (bool)hasFrame { return _view != nil; }
 
 - (void)setEnabled:(bool)enabled
 {
-   if (_enabled == enabled) return;
+   if (_enabled == enabled)
+      return;
    _enabled      = enabled;
    _view.visible = enabled;
 }
 
-- (bool)enabled
-{
-   return _enabled;
-}
+- (bool)enabled { return _enabled; }
 
 - (void)updateWidth:(int)width
              height:(int)height
@@ -561,10 +511,8 @@
       if (!(CGSizeEqualToSize(_view.size, size) &&
             _view.format == format &&
             _view.filter == filter))
-      {
          _view = nil;
    }
-   }
 
    if (!_view)
    {
@@ -632,14 +580,14 @@ typedef struct MTLALIGN(16)
 @implementation FrameView
 {
    Context *_context;
-   id<MTLTexture> _texture; // final render texture
+   id<MTLTexture> _texture; /* final render texture */
    Vertex _v[4];
    VertexSlang _vertex[4];
-   CGSize _size; // size of view in pixels
+   CGSize _size; /* size of view in pixels */
    CGRect _frame;
    NSUInteger _bpp;
 
-   id<MTLTexture> _src;    // src texture
+   id<MTLTexture> _src; /* source texture */
    bool _srcDirty;
 
    id<MTLSamplerState> _samplers[RARCH_FILTER_MAX][RARCH_WRAP_MAX];
@@ -662,13 +610,9 @@ typedef struct MTLALIGN(16)
       _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];
@@ -677,7 +621,7 @@ typedef struct MTLALIGN(16)
       self.frame            = CGRectMake(0, 0, 1, 1);
       resize_render_targets = YES;
 
-      // init slang vertex buffer
+      /* Initialize 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)},
@@ -691,10 +635,11 @@ typedef struct MTLALIGN(16)
 
 - (void)_initSamplers
 {
+   int i;
    MTLSamplerDescriptor *sd = [MTLSamplerDescriptor new];
 
    /* Initialize samplers */
-   for (unsigned i = 0; i < RARCH_WRAP_MAX; i++)
+   for (i = 0; i < RARCH_WRAP_MAX; i++)
    {
       switch (i)
       {
@@ -739,7 +684,8 @@ typedef struct MTLALIGN(16)
 
 - (void)setFilteringIndex:(int)index smooth:(bool)smooth
 {
-   for (int i = 0; i < RARCH_WRAP_MAX; i++)
+   int i;
+   for (i = 0; i < RARCH_WRAP_MAX; i++)
    {
       if (smooth)
          _samplers[RARCH_FILTER_UNSPEC][i] = _samplers[RARCH_FILTER_LINEAR][i];
@@ -754,10 +700,10 @@ typedef struct MTLALIGN(16)
       return;
 
    _size                 = size;
-
    resize_render_targets = YES;
 
-   if (_format != RPixelFormatBGRA8Unorm && _format != RPixelFormatBGRX8Unorm)
+   if (   _format != RPixelFormatBGRA8Unorm
+       && _format != RPixelFormatBGRX8Unorm)
    {
       MTLTextureDescriptor *td = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:MTLPixelFormatR16Uint
                                  width:(NSUInteger)size.width
@@ -767,19 +713,14 @@ typedef struct MTLALIGN(16)
    }
 }
 
-- (CGSize)size
-{
-   return _size;
-}
+- (CGSize)size { return _size; }
 
 - (void)setFrame:(CGRect)frame
 {
    if (CGRectEqualToRect(_frame, frame))
       return;
 
-   _frame = frame;
-
-   // update vertices
+   /* update vertices */
    CGPoint o   = frame.origin;
    CGSize  s   = frame.size;
 
@@ -794,13 +735,12 @@ typedef struct MTLALIGN(16)
       {simd_make_float3(l, t, 0), simd_make_float2(0, 0)},
       {simd_make_float3(r, t, 0), simd_make_float2(1, 0)},
    };
+   
+   _frame      = frame;
    memcpy(_v, v, sizeof(_v));
 }
 
-- (CGRect)frame
-{
-   return _frame;
-}
+- (CGRect)frame { return _frame; }
 
 - (void)_convertFormat
 {
@@ -837,8 +777,8 @@ typedef struct MTLALIGN(16)
    }
 
    /* 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)
+   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
@@ -851,13 +791,14 @@ typedef struct MTLALIGN(16)
 
 - (bool)readViewport:(uint8_t *)buffer isIdle:(bool)isIdle
 {
+   bool res;
    bool enabled = _context.captureEnabled;
    if (!enabled)
       _context.captureEnabled = YES;
 
    video_driver_cached_frame();
 
-   bool res = [_context readBackBuffer:buffer];
+   res = [_context readBackBuffer:buffer];
 
    if (!enabled)
       _context.captureEnabled = NO;
@@ -887,7 +828,8 @@ typedef struct MTLALIGN(16)
 
    [self _updateHistory];
 
-   if (_format == RPixelFormatBGRA8Unorm || _format == RPixelFormatBGRX8Unorm)
+   if (   _format == RPixelFormatBGRA8Unorm
+       || _format == RPixelFormatBGRX8Unorm)
    {
       id<MTLTexture> tex = _engine.frame.texture[0].view;
       [tex replaceRegion:MTLRegionMake2D(0, 0, (NSUInteger)_size.width, (NSUInteger)_size.height)
@@ -919,7 +861,9 @@ typedef struct MTLALIGN(16)
             width:(NSUInteger)_size.width
             height:(NSUInteger)_size.height
             mipmapped:false];
-   td.usage = MTLTextureUsageShaderRead | MTLTextureUsageShaderWrite | MTLTextureUsageRenderTarget;
+   td.usage = MTLTextureUsageShaderRead
+            | MTLTextureUsageShaderWrite
+            | MTLTextureUsageRenderTarget;
 
    for (i = 0; i < _shader->history_size + 1; i++)
       [self _initTexture:&_engine.frame.texture[i] withDescriptor:td];
@@ -939,7 +883,7 @@ typedef struct MTLALIGN(16)
 
 - (void)drawWithContext:(Context *)ctx
 {
-   unsigned i;
+   int i;
    _texture = _engine.frame.texture[0].view;
    [self _convertFormat];
 
@@ -963,16 +907,17 @@ typedef struct MTLALIGN(16)
    rpd.colorAttachments[0].loadAction  = MTLLoadActionDontCare;
    rpd.colorAttachments[0].storeAction = MTLStoreActionStore;
 
-   for (unsigned i = 0; i < _shader->passes; i++)
+   for (i = 0; i < _shader->passes; i++)
    {
+      int j;
+      __unsafe_unretained id<MTLTexture> textures[SLANG_NUM_BINDINGS] = {NULL};
+      id<MTLSamplerState> samplers[SLANG_NUM_BINDINGS] = {NULL};
       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;
@@ -996,7 +941,7 @@ typedef struct MTLALIGN(16)
          _engine.pass[i].frame_direction = 1;
 #endif
 
-      for (unsigned j = 0; j < SLANG_CBUFFER_MAX; j++)
+      for (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];
@@ -1024,9 +969,6 @@ typedef struct MTLALIGN(16)
          }
       }
 
-      __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)
       {
@@ -1038,13 +980,9 @@ typedef struct MTLALIGN(16)
       }
 
       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)];
@@ -1052,9 +990,7 @@ typedef struct MTLALIGN(16)
       [rce drawPrimitives:MTLPrimitiveTypeTriangleStrip vertexStart:0 vertexCount:4];
 
       if (!backBuffer)
-      {
          [rce endEncoding];
-      }
 
       _texture = _engine.pass[i].rt.view;
    }
@@ -1069,10 +1005,12 @@ typedef struct MTLALIGN(16)
 
 - (void)_updateRenderTargets
 {
+   int i;
+   NSUInteger width, height;
    if (!_shader || !resize_render_targets) return;
 
    // release existing targets
-   for (int i = 0; i < _shader->passes; i++)
+   for (i = 0; i < _shader->passes; i++)
    {
       STRUCT_ASSIGN(_engine.pass[i].rt.view, nil);
       STRUCT_ASSIGN(_engine.pass[i].feedback.view, nil);
@@ -1080,9 +1018,10 @@ typedef struct MTLALIGN(16)
       memset(&_engine.pass[i].feedback, 0, sizeof(_engine.pass[i].feedback));
    }
 
-   NSUInteger width = (NSUInteger)_size.width, height = (NSUInteger)_size.height;
+   width  = (NSUInteger)_size.width;
+   height = (NSUInteger)_size.height;
 
-   for (unsigned i = 0; i < _shader->passes; i++)
+   for (i = 0; i < _shader->passes; i++)
    {
       struct video_shader_pass *shader_pass = &_shader->pass[i];
 
@@ -1149,18 +1088,16 @@ typedef struct MTLALIGN(16)
          _engine.pass[i].viewport.zfar = 1.0;
 
          MTLTextureDescriptor *td = [MTLTextureDescriptor texture2DDescriptorWithPixelFormat:fmt
-                                                                                       width:width
-                                                                                      height:height
-                                                                                   mipmapped:false];
+            width:width height:height mipmapped:false];
          td.storageMode = MTLStorageModePrivate;
-         td.usage = MTLTextureUsageShaderRead | MTLTextureUsageRenderTarget;
+         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;
@@ -1175,11 +1112,13 @@ typedef struct MTLALIGN(16)
 
 - (void)_freeVideoShader:(struct video_shader *)shader
 {
+   int i;
    if (!shader)
       return;
 
-   for (int i = 0; i < GFX_MAX_SHADERS; i++)
+   for (i = 0; i < GFX_MAX_SHADERS; i++)
    {
+      int j;
       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));
@@ -1187,13 +1126,13 @@ typedef struct MTLALIGN(16)
 
       STRUCT_ASSIGN(_engine.pass[i]._state, nil);
 
-      for (unsigned j = 0; j < SLANG_CBUFFER_MAX; j++)
+      for (j = 0; j < SLANG_CBUFFER_MAX; j++)
       {
          STRUCT_ASSIGN(_engine.pass[i].buffers[j], nil);
       }
    }
 
-   for (int i = 0; i < GFX_MAX_TEXTURES; i++)
+   for (i = 0; i < GFX_MAX_TEXTURES; i++)
    {
       STRUCT_ASSIGN(_engine.luts[i].view, nil);
    }
@@ -1213,7 +1152,7 @@ typedef struct MTLALIGN(16)
 
    @try
    {
-      unsigned i;
+      int i;
       texture_t *source = NULL;
       if (!video_shader_load_preset_into_shader(path.UTF8String, shader))
          return NO;
@@ -1395,15 +1334,17 @@ typedef struct MTLALIGN(16)
 
       for (i = 0; i < shader->luts; i++)
       {
-         struct texture_image image = {0};
+         struct texture_image image;
+         image.pixels               = NULL;
+         image.width                = 0;
+         image.height               = 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
+             width:image.width height:image.height
              mipmapped:shader->lut[i].mipmap];
          td.usage                 = MTLTextureUsageShaderRead;
          [self _initTexture:&_engine.luts[i] withDescriptor:td];
@@ -1421,10 +1362,8 @@ typedef struct MTLALIGN(16)
    @finally
    {
       if (shader)
-      {
          [self _freeVideoShader:shader];
    }
-   }
 
    resize_render_targets = YES;
    init_history          = YES;
@@ -1445,25 +1384,22 @@ typedef struct MTLALIGN(16)
 - (instancetype)initWithContext:(Context *)context
 {
    if (self = [super init])
-   {
       _context = context;
-   }
    return self;
 }
 
 - (bool)loadImages:(const struct texture_image *)images count:(NSUInteger)count
 {
+   int i;
    [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++)
+   for (i = 0; i < count; i++)
    {
       _images[i] = [_context newTexture:images[i] mipmapped:NO];
       [self updateVertexX:0 y:0 w:1 h:1 index:i];
@@ -1478,6 +1414,8 @@ typedef struct MTLALIGN(16)
 
 - (void)drawWithEncoder:(id<MTLRenderCommandEncoder>)rce
 {
+   int i;
+   NSUInteger count;
 #if !defined(HAVE_COCOATOUCH)
    if (_vertDirty)
    {
@@ -1486,8 +1424,8 @@ typedef struct MTLALIGN(16)
    }
 #endif
 
-   NSUInteger count = _images.count;
-   for (NSUInteger i = 0; i < count; ++i)
+   count = _images.count;
+   for (i = 0; i < count; ++i)
    {
       NSUInteger offset = sizeof(SpriteVertex) * 4 * i;
       [rce setVertexBuffer:_vert offset:offset atIndex:BufferIndexPositions];
@@ -1538,10 +1476,7 @@ typedef struct MTLALIGN(16)
    _vertDirty       = YES;
 }
 
-- (void)_freeImages
-{
-   _images = nil;
-}
+- (void)_freeImages { _images = nil; }
 
 @end