From 02f963a4bab95b3a328b6a792c9a7e027ade0e26 Mon Sep 17 00:00:00 2001
From: Hannes Schulze <haschu0103@outlook.de>
Date: Mon, 13 Jan 2025 22:03:10 +0100
Subject: implement display

---
 src/scene.mm | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/scene.mm

(limited to 'src/scene.mm')

diff --git a/src/scene.mm b/src/scene.mm
new file mode 100644
index 0000000..944d01a
--- /dev/null
+++ b/src/scene.mm
@@ -0,0 +1,96 @@
+#import "scene.hh"
+#import "nes/nes.hh"
+#import "nes/display.hh"
+#import "nes/util/rgb.hh"
+#import <memory>
+
+namespace
+{
+    class display_impl : public nes::display
+    {
+        SKSpriteNode* node_;
+        NSMutableData* buffer_front_;
+        NSMutableData* buffer_back_;
+        std::uint8_t* bytes_back_;
+
+    public:
+        explicit display_impl(SKSpriteNode* node)
+            : node_{ node }
+            , buffer_front_{ make_buffer() }
+            , buffer_back_{ make_buffer() }
+            , bytes_back_{ static_cast<std::uint8_t*>([buffer_back_ mutableBytes]) }
+        {
+        }
+
+        ~display_impl() = default;
+
+        virtual auto switch_buffers() -> void override
+        {
+            auto tmp = buffer_back_;
+            buffer_back_ = buffer_front_;
+            buffer_front_ = tmp;
+            bytes_back_ = static_cast<std::uint8_t*>([buffer_back_ mutableBytes]);
+
+            auto texture = [SKTexture textureWithData:buffer_front_ size:CGSizeMake(width, height)];
+            [texture setFilteringMode:SKTextureFilteringNearest];
+            [node_ setTexture:texture];
+        }
+
+		virtual auto set(unsigned x, unsigned y, nes::rgb value) -> void override
+        {
+            auto const offset = (y * width + x) * 4;
+            bytes_back_[offset + 0] = value.r;
+            bytes_back_[offset + 1] = value.g;
+            bytes_back_[offset + 2] = value.b;
+            bytes_back_[offset + 3] = 255;
+        }
+
+		virtual auto get(unsigned x, unsigned y) const -> nes::rgb override
+        {
+            auto const offset = (y * width + x) * 4;
+            auto res = nes::rgb{};
+            res.r = bytes_back_[offset + 0];
+            res.g = bytes_back_[offset + 1];
+            res.b = bytes_back_[offset + 2];
+            return res;
+        }
+
+    private:
+        static auto make_buffer() -> NSMutableData*
+        {
+            auto const length = NSUInteger{ width * height * 4 };
+            return [NSMutableData dataWithLength:length];
+        }
+    };
+} // namespace
+
+@implementation Scene
+{
+    std::unique_ptr<display_impl> display_;
+    std::unique_ptr<nes::nes> nes_;
+}
+
+- (instancetype)init
+{
+    self = [super initWithSize:CGSizeMake(nes::display::width, nes::display::height)];
+    if (self)
+    {
+        SKSpriteNode* node = [[SKSpriteNode alloc] init];
+        [node setAnchorPoint:CGPointZero];
+        [node setSize:[self size]];
+
+        [self setScaleMode:SKSceneScaleModeAspectFit];
+        [self addChild:node];
+
+        self->display_ = std::make_unique<display_impl>(node);
+        self->nes_ = std::make_unique<nes::nes>(*self->display_);
+    }
+    return self;
+}
+
+- (void)update:(NSTimeInterval)currentTime
+{
+    [super update:currentTime];
+}
+
+@end
\ No newline at end of file
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