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

---
 .gitignore       |  2 ++
 CMakeLists.txt   | 17 ++++++++++++++
 README.md        |  2 ++
 src/main.c       | 16 +++++++++++++
 src/sldj.c       | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/sldj.h       | 22 ++++++++++++++++++
 src/sldjConfig.h | 12 ++++++++++
 src/util.c       |  2 ++
 src/util.h       | 13 +++++++++++
 9 files changed, 154 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 CMakeLists.txt
 create mode 100644 README.md
 create mode 100644 src/main.c
 create mode 100644 src/sldj.c
 create mode 100644 src/sldj.h
 create mode 100644 src/sldjConfig.h
 create mode 100644 src/util.c
 create mode 100644 src/util.h

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..9785597
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+build
+.cache
diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..bb6c55d
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,17 @@
+cmake_minimum_required(VERSION 3.30.5)
+
+project(sldj VERSION 1.0)
+
+find_package(raylib 3.0 REQUIRED)
+
+set(C_STANDARD 99)
+set(C_STANDARD_REQUIRED ON)
+set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
+
+file(GLOB SRC_FILES src/*.c)
+
+add_executable(${PROJECT_NAME} ${SRC_FILES})
+
+target_include_directories(${PROJECT_NAME} PUBLIC include src)
+target_link_libraries(${PROJECT_NAME} raylib m tcc)
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..47255c3
--- /dev/null
+++ b/README.md
@@ -0,0 +1,2 @@
+# Scanline DJ
+Fun  little project for making cool videos
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..a02b023
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,16 @@
+#include <raylib.h>
+#include "sldj.h"
+
+int main()
+{
+    Sldj sldj;
+    initSldj(&sldj);
+    
+    while (!WindowShouldClose())
+    {
+        updateSldj(&sldj);
+    }
+
+    closeSldj(&sldj);
+    return 0;
+}
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();
+}
+
diff --git a/src/sldj.h b/src/sldj.h
new file mode 100644
index 0000000..4db6afb
--- /dev/null
+++ b/src/sldj.h
@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <raylib.h>
+#include <math.h>
+#include <stdint.h>
+
+#include "sldjConfig.h"
+#include "util.h"
+
+#ifndef SLDJ_H
+#define SLDJ_H
+
+typedef struct Sldj {
+    RenderTexture screenTexture;
+    int frameCounter;
+} Sldj;
+
+void initSldj(Sldj* sldj);
+void updateSldj(Sldj* sldj);
+void closeSldj(Sldj* sldj);
+
+#endif
diff --git a/src/sldjConfig.h b/src/sldjConfig.h
new file mode 100644
index 0000000..53fa4e9
--- /dev/null
+++ b/src/sldjConfig.h
@@ -0,0 +1,12 @@
+#ifndef CONFIG_SLDJ_H
+#define CONFIG_SLDJ_H
+
+#define WINDOW_WIDTH 960
+#define WINDOW_HEIGHT 720
+
+#define SCREEN_WIDTH 640
+#define SCREEN_HEIGHT 480
+
+#define FRAME_RATE 24
+
+#endif
diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..b7e445c
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,2 @@
+#include "util.h"
+
diff --git a/src/util.h b/src/util.h
new file mode 100644
index 0000000..110aae7
--- /dev/null
+++ b/src/util.h
@@ -0,0 +1,13 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+#ifndef UTIL_H
+#define UTIL_H
+
+#define SET_BIT(b, n) (b | (0x1 << n))
+#define CLEAR_BIT(b, n) (b & ~(0x1 << n))
+#define IS_BIT_SET(b, n) ((b >> n) & 0x1)
+#define TOGGLE_BIT(b, n) (b ^ (0x1 << n))
+#define HAS_FLAG(v, f) ((v & f) == f)
+
+#endif
-- 
cgit v1.2.3