From b1d1573702f21e3104606d6ade5f5d39ec86a33a Mon Sep 17 00:00:00 2001
From: Hannes Schulze <haschu0103@outlook.de>
Date: Thu, 23 Jan 2025 22:02:11 +0100
Subject: restructure project

---
 app/mac/scene.mm | 179 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 179 insertions(+)
 create mode 100644 app/mac/scene.mm

(limited to 'app/mac/scene.mm')

diff --git a/app/mac/scene.mm b/app/mac/scene.mm
new file mode 100644
index 0000000..f858185
--- /dev/null
+++ b/app/mac/scene.mm
@@ -0,0 +1,179 @@
+#import "scene.hh"
+#import "nes/nes.hh"
+#import "nes/display.hh"
+#import "nes/util/rgb.hh"
+#import <memory>
+#import <optional>
+
+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 actually_switch_buffers() -> void
+        {
+            auto texture = [SKTexture textureWithData:buffer_front_ size:CGSizeMake(width, height) flipped:YES];
+            [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_;
+    std::optional<NSTimeInterval> last_time_;
+}
+
+- (instancetype)initWithFilePath:(NSString*)filePath
+{
+    self = [super initWithSize:CGSizeMake(nes::display::width, nes::display::height)];
+    if (self)
+    {
+        auto node = [[SKSpriteNode alloc] init];
+        [node setAnchorPoint:CGPointZero];
+        [node setSize:[self size]];
+
+        [self setScaleMode:SKSceneScaleModeAspectFit];
+        [self addChild:node];
+
+        auto cartridge = nes::cartridge::from_file([filePath UTF8String]);
+
+        self->display_ = std::make_unique<display_impl>(node);
+        self->nes_ = std::make_unique<nes::nes>(std::move(cartridge), *self->display_);
+    }
+    return self;
+}
+
+- (void)keyDown:(NSEvent*)event
+{
+    auto& controller_1 = self->nes_->get_controller_1();
+
+    switch ([event keyCode])
+    {
+        case 0x7e: // up arrow
+            controller_1.get_pressed().add(nes::buttons::up);
+            break;
+        case 0x7d: // down arrow
+            controller_1.get_pressed().add(nes::buttons::down);
+            break;
+        case 0x7b: // left arrow
+            controller_1.get_pressed().add(nes::buttons::left);
+            break;
+        case 0x7c: // right arrow
+            controller_1.get_pressed().add(nes::buttons::right);
+            break;
+        case 0x6: // "Z"
+            controller_1.get_pressed().add(nes::buttons::a);
+            break;
+        case 0x7: // "X"
+            controller_1.get_pressed().add(nes::buttons::b);
+            break;
+        case 0x24: // return
+            controller_1.get_pressed().add(nes::buttons::start);
+            break;
+        case 0x31: // space
+            controller_1.get_pressed().add(nes::buttons::select);
+            break;
+        default:
+            [super keyDown:event];
+            break;
+    }
+}
+
+- (void)keyUp:(NSEvent*)event
+{
+    auto& controller_1 = self->nes_->get_controller_1();
+
+    switch ([event keyCode])
+    {
+        case 0x7e: // up arrow
+            controller_1.get_pressed().remove(nes::buttons::up);
+            break;
+        case 0x7d: // down arrow
+            controller_1.get_pressed().remove(nes::buttons::down);
+            break;
+        case 0x7b: // left arrow
+            controller_1.get_pressed().remove(nes::buttons::left);
+            break;
+        case 0x7c: // right arrow
+            controller_1.get_pressed().remove(nes::buttons::right);
+            break;
+        case 0x6: // "Z"
+            controller_1.get_pressed().remove(nes::buttons::a);
+            break;
+        case 0x7: // "X"
+            controller_1.get_pressed().remove(nes::buttons::b);
+            break;
+        case 0x24: // return
+            controller_1.get_pressed().remove(nes::buttons::start);
+            break;
+        case 0x31: // space
+            controller_1.get_pressed().remove(nes::buttons::select);
+            break;
+        default:
+            [super keyUp:event];
+            break;
+    }
+}
+
+- (void)update:(NSTimeInterval)currentTime
+{
+    auto const last_time = self->last_time_.value_or(currentTime);
+    last_time_ = currentTime;
+    auto const delta_us = static_cast<std::uint64_t>((currentTime - last_time) * 1000. * 1000.);
+    self->nes_->step(std::chrono::microseconds{ delta_us });
+    self->display_->actually_switch_buffers();
+}
+
+@end
\ No newline at end of file
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