new code

2026-06-17 10:35:08 -07:00
parent e3b09170a4
commit 5355a9eded
9 changed files with 1836 additions and 0 deletions
--- a/include/02_text_description.h
+++ b/include/02_text_description.h
@@ -0,0 +1,96 @@
+/*
+ * 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.
+ */
+
+/*
+ * 02_text_description.h
+ * Author: Mark Allyn
+ * Component: 02_text_description
+ *
+ * FreeType-based text renderer used by all three screen panels
+ * (left description panel, scope panel, status bar).
+ *
+ * Usage:
+ *   1. Call g_text_renderer.initialize_shaders() after GLAD is loaded.
+ *   2. Call g_text_renderer.initialize_font(FONT_PATH, FONT_SIZE_NORMAL).
+ *   3. Before rendering into a viewport, call set_projection(w, h).
+ *   4. Call render_text() with viewport-local pixel coordinates.
+ */
+
+#pragma once
+
+#include <string>
+#include <map>
+#include <glad/glad.h>
+#include "data_structure_and_constants.h"
+#include "settings.h"
+
+/* Cached metrics for one loaded glyph. */
+struct glyph_character {
+    GLuint       texture_id; // GL_RED single-channel texture
+    int          size_x;     // bitmap width in pixels
+    int          size_y;     // bitmap height in pixels
+    int          bearing_x;  // pixel offset from cursor to left of glyph
+    int          bearing_y;  // pixel offset from cursor baseline to top of glyph
+    unsigned int advance;    // horizontal advance in 1/64-pixel units
+};
+
+class TextRenderer {
+public:
+    TextRenderer() : vao_(0), vbo_(0), shader_program_(0) {}
+
+    /* Compile and link 02_text_description_{vert,frag}.glsl.
+     * Must be called once, after GLAD is initialised. */
+    bool initialize_shaders();
+
+    /* Load glyphs for printable ASCII (32–126) from the given font file.
+     * font_size is the desired pixel height. */
+    bool initialize_font(const std::string& font_path, unsigned int font_size);
+
+    /* Render text at (x, y) in viewport-local pixel coordinates.
+     * y=0 is the bottom of the current viewport.
+     * scale multiplies the loaded glyph size.
+     * color_r/g/b are 0.0–1.0. */
+    void render_text(const std::string& text,
+                     float x, float y, float scale,
+                     float color_r, float color_g, float color_b);
+
+    /* Return the rendered pixel width of text at the given scale. */
+    float get_text_width(const std::string& text, float scale) const;
+
+    /* Set the orthographic projection for a viewport of w × h pixels.
+     * Call this each time glViewport changes before rendering text. */
+    void set_projection(int w, int h);
+
+    /* Release all GL resources and glyph textures. */
+    void cleanup();
+
+private:
+    std::map<char, glyph_character> characters_;
+    GLuint                          vao_;
+    GLuint                          vbo_;
+    GLuint                          shader_program_;
+};
+
+/* Global instance — shared by all panels and radar stubs. */
+extern TextRenderer g_text_renderer;