From 305c224104be6558f2ece595a47cf29348b60d66 Mon Sep 17 00:00:00 2001
From: nathansmith117 <nathansmith117@sdf.org>
Date: Mon, 3 Feb 2025 06:46:19 -0700
Subject: first commit

---
 src/sldj.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 src/sldj.c

(limited to 'src/sldj.c')

diff --git a/src/sldj.c b/src/sldj.c
new file mode 100644
index 0000000..a2b0c47
--- /dev/null
+++ b/src/sldj.c
@@ -0,0 +1,68 @@
+#include "sldj.h"
+
+void initSldj(Sldj* sldj)
+{
+    InitWindow(WINDOW_WIDTH, WINDOW_HEIGHT, "Scanline DJ");
+    SetWindowState(FLAG_WINDOW_RESIZABLE);
+    SetTargetFPS(FRAME_RATE);
+
+    sldj->screenTexture = LoadRenderTexture(SCREEN_WIDTH, SCREEN_HEIGHT);
+    sldj->frameCounter = 0;
+}
+
+uint16_t noise = 0;
+
+Color scanPoint(uint16_t x, uint16_t y, int frame)
+{
+    noise ^= frame;
+    noise ^= x ^ y;
+    return (Color){.r = (y >> (6 - noise)) ^ (frame << 4), .g = noise >> x, .b = 0, .a = 255};
+}
+
+void updateSldj(Sldj* sldj)
+{
+    BeginDrawing();
+
+    // Scan image.
+    BeginTextureMode(sldj->screenTexture);
+
+    uint16_t xScaled = 0;
+    uint16_t yScaled = 0;
+
+    for (uint16_t y = 0; y < SCREEN_HEIGHT; ++y)
+    {
+        xScaled = 0;
+        
+        for (uint16_t x = 0; x < SCREEN_WIDTH; ++x)
+        {
+            DrawPixel(x, y, scanPoint(xScaled, yScaled, sldj->frameCounter));
+            xScaled += 65536 / SCREEN_WIDTH;
+        }
+
+        yScaled += 65536 / SCREEN_HEIGHT;
+    }
+
+    EndTextureMode();
+
+    // Draw scanned image.
+    DrawTexturePro(
+        sldj->screenTexture.texture,
+        (Rectangle){0.0, 0.0, SCREEN_WIDTH, SCREEN_HEIGHT},
+        (Rectangle){0.0, 0.0, SCREEN_WIDTH, SCREEN_HEIGHT},
+        (Vector2){0.0, 0.0},
+        0.0,
+        WHITE
+    );
+
+    EndDrawing();
+
+    ++sldj->frameCounter;
+}
+
+void closeSldj(Sldj* sldj)
+{
+    UnloadRenderTexture(sldj->screenTexture);
+    
+    CloseWindow();
+}
+
-- 
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