metal: Set up correct viewport before rendering overlay

gfx/common/metal/Context.h

@@ -23,6 +23,11 @@ typedef struct
    __unsafe_unretained id<MTLBuffer> buffer;
 } BufferRange;
 
+typedef NS_ENUM(NSUInteger, ViewportResetMode) {
+   kFullscreenViewport,
+   kVideoViewport
+};
+
 /*! @brief Context contains the render state used by various components */
 @interface Context : NSObject
 
@@ -59,8 +64,8 @@ typedef struct
 - (void)convertFormat:(RPixelFormat)fmt from:(id<MTLTexture>)src to:(id<MTLTexture>)dst;
 - (id<MTLRenderPipelineState>)getStockShader:(int)index blend:(bool)blend;
 
-/*! @brief resets the viewport for the main render encoder to the drawable size */
-- (void)resetRenderViewport;
+/*! @brief resets the viewport for the main render encoder to \a mode */
+- (void)resetRenderViewport:(ViewportResetMode)mode;
 
 /*! @brief resets the scissor rect for the main render encoder to the drawable size */
 - (void)resetScissorRect;

gfx/common/metal/Context.m

@@ -583,13 +583,14 @@
    return _rce;
 }
 
-- (void)resetRenderViewport
+- (void)resetRenderViewport:(ViewportResetMode)mode
 {
+   bool fullscreen = mode == kFullscreenViewport;
    MTLViewport vp = {
-      .originX = 0,
-      .originY = 0,
-      .width   = _viewport.full_width,
-      .height  = _viewport.full_height,
+      .originX = fullscreen ? 0 : _viewport.x,
+      .originY = fullscreen ? 0 : _viewport.y,
+      .width   = fullscreen ? _viewport.full_width : _viewport.width,
+      .height  = fullscreen ? _viewport.full_height : _viewport.height,
       .znear   = 0,
       .zfar    = 1,
    };

gfx/common/metal/MenuDisplay.m

@@ -173,7 +173,7 @@
    id<MTLRenderCommandEncoder> rce = _context.rce;
    if (_clearNextRender)
    {
-      [_context resetRenderViewport];
+      [_context resetRenderViewport:kFullscreenViewport];
       [_context drawQuadX:0
                         y:0
                         w:1

gfx/common/metal_common.m

@@ -287,6 +287,7 @@
       {
          id<MTLRenderCommandEncoder> rce = _context.rce;
          [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];
@@ -340,7 +341,7 @@
       float g = settings->uints.video_msg_bgcolor_green / 255.0f;
       float b = settings->uints.video_msg_bgcolor_blue / 255.0f;
       float a = settings->floats.video_msg_bgcolor_opacity;
-      [_context resetRenderViewport];
+      [_context resetRenderViewport:kFullscreenViewport];
       [_context drawQuadX:x y:y w:width h:height r:r g:g b:b a:a];
    }
 
@@ -411,15 +412,7 @@
    else
    {
       [rce pushDebugGroup:@"menu"];
-      MTLViewport viewport = {
-         .originX = 0.0f,
-         .originY = 0.0f,
-         .width = _viewport->full_width,
-         .height = _viewport->full_height,
-         .znear = 0.0f,
-         .zfar = 1.0,
-      };
-      [rce setViewport:viewport];
+      [_context resetRenderViewport:kFullscreenViewport];
       menu_driver_frame(video_info);
       [rce popDebugGroup];
    }

gfx/drivers_font/metal_raster_font.m

@@ -330,7 +330,7 @@ static INLINE void write_quad6(SpriteVertex *pv,
    id<MTLRenderCommandEncoder> rce = _context.rce;
    [rce pushDebugGroup:@"render fonts"];
 
-   [_context resetRenderViewport];
+   [_context resetRenderViewport:kFullscreenViewport];
    [rce setRenderPipelineState:_state];
    [rce setVertexBytes:&_uniforms length:sizeof(Uniforms) atIndex:BufferIndexUniforms];
    [rce setVertexBuffer:_vert offset:start atIndex:BufferIndexPositions];