Initial setup for project, preparing for first component

global_data.cpp

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+/*
+ * MIT License
+ *
+ * Copyright (c) 2026 Mark Allyn
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+/*
+ * global_data.cpp
+ * Author: Mark Allyn
+ *
+ * Definitions of all system-wide global variables.
+ * Extern declarations live in include/data_structure_and_constants.h.
+ */
+
+#include "include/data_structure_and_constants.h"
+
+/* ============================================================
+ * THREAD MUTEXES
+ * Components: all threads as noted per mutex
+ * ============================================================ */
+
+// Thread 2 -> Thread 1: target data handoff
+// Components: Traffic Cop (Thread 2), Thread 1
+std::mutex mutex_target_data;
+
+// Thread 3 -> Thread 2: simulator to traffic cop
+// Components: Simulator (Thread 3), Traffic Cop (Thread 2)
+std::mutex mutex_simulator_to_traffic_cop;
+
+// Thread 4 -> Thread 1: physical control panel data (not yet implemented)
+// Components: Physical Controls (Thread 4), Thread 1
+std::mutex mutex_control_data_to_shaders;
+
+// Thread 5 -> Thread 2: Raspberry Pi receiver to traffic cop (not yet implemented)
+// Components: Raspberry Pi Receiver (Thread 5), Traffic Cop (Thread 2)
+std::mutex mutex_raspberry_pi;
+
+/* ============================================================
+ * SHADER UNIFORM COPIES
+ * These are set by keyboard callbacks in Thread 1 and pushed to
+ * GLSL shader uniforms each frame render.
+ * Initial values are sensible defaults; adjust in include/settings.h
+ * as components are developed and tested.
+ * ============================================================ */
+
+// Scope intensity — keyboard 3 (lower) / 4 (higher)
+// GLSL uniform: float intensity
+// Components: all scopes
+float uniform_intensity = 1.0f;
+
+// Receiver sensitivity — keyboard 5 (lower) / 6 (higher)
+// GLSL uniform: float sensitivity
+// Components: all scopes
+float uniform_sensitivity = 1.0f;
+
+// STC sensitivity for close-in targets — keyboard q (lower) / w (higher)
+// GLSL uniform: float stc_sensitivity
+// Components: all scopes
+float uniform_stc_sensitivity = 0.5f;
+
+// STC effective range (normalized 0-1) — keyboard e (lower) / r (higher)
+// GLSL uniform: float stc_range
+// Components: all scopes
+float uniform_stc_range = 0.3f;
+
+// Rain noise filter, PPI scopes only — keyboard t (decrease) / y (increase)
+// GLSL uniform: float noise_filter
+// Components: PPI scopes (marine traffic control, on-board boat)
+float uniform_noise_filter = 0.0f;
+
+// Chain Home radiogoniometer bearing in degrees — keyboard u (left) / i (right)
+// GLSL uniform: float radiogoniometer
+// Components: Chain Home A-scope
+float uniform_radiogoniometer = 0.0f;
+
+// Maximum radar range (scope-dependent units) — keyboard o (lower) / p (higher)
+// GLSL uniform: float max_range
+// Components: Marine A-scope, PPI scopes (not Chain Home; that is fixed)
+float uniform_max_range = 1.0f;
+
+// Range cursor position (normalized 0-1) — keyboard a (lower) / s (higher)
+// GLSL uniform: float range_cursor
+// Components: PPI scopes (marine traffic control, on-board boat)
+float uniform_range_cursor = 0.5f;
+
+// Bearing cursor in degrees — keyboard d (CCW) / f (CW)
+// GLSL uniform: float bearing_cursor
+// Components: PPI scopes (marine traffic control, on-board boat)
+float uniform_bearing_cursor = 0.0f;
+
+// Marine A-scope antenna rotation bearing in degrees — keyboard g (CCW) / h (CW)
+// GLSL uniform: float marine_a_bearing
+// Components: Marine A-scope
+float uniform_marine_a_bearing = 0.0f;