Text Rendering

2025-10-20 23:39:54 +05:30
parent d4e93b047c
commit b10aacaee7
40 changed files with 1295 additions and 297 deletions
--- a/Engine/Src/Imp/CPP/FontManager.cpp
+++ b/Engine/Src/Imp/CPP/FontManager.cpp
@ -0,0 +1,97 @@
+// IAEngine: 2D Game Engine by IA
+// Copyright (C) 2025 IASoft (PVT) LTD (oss@iasoft.dev)
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+#include <FontManager.hpp>
+
+#include <Renderer/GPUResourceManager.hpp>
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+namespace ia::iae
+{
+    Map<String, FontManager::Font> FontManager::s_fonts;
+
+    FT_Library g_freetype;
+
+    VOID FontManager::Initialize()
+    {
+        if (FT_Init_FreeType(&g_freetype))
+            THROW_UNKNOWN("Failed to initialize the FreeType font library");
+
+        LoadFont("Roboto", "Resources/Fonts/Roboto-Black.ttf");
+    }
+
+    VOID FontManager::Terminate()
+    {
+        for(const auto& f: s_fonts)
+        {
+            for(const auto& t: f->Value.Chars)
+                GPUResourceManager::DestroyTexture(t.Texture);
+        }
+
+        FT_Done_FreeType(g_freetype);
+    }
+
+    VOID FontManager::LoadFont(IN CONST String &name, IN CONST String &path)
+    {
+        STATIC Vector<UINT8> GLYPH_PIXEL_DATA;
+
+        Font result;
+
+        const auto fontSize = 16;
+
+        FT_Face face;
+        if (FT_New_Face(g_freetype, path.c_str(), 0, &face))
+            THROW_UNKNOWN("Failed to load the TrueType font '", path, "'");
+
+        FT_Set_Pixel_Sizes(face, 0, fontSize);
+
+        const auto charCount = static_cast<UINT8>(sizeof(result.Chars) / sizeof(result.Chars[0]));
+        for (UINT8 c = 0; c < charCount; c++)
+        {
+            if (FT_Load_Char(face, c, FT_LOAD_RENDER))
+                THROW_UNKNOWN("Failed to load character '", (CHAR) c, "' of TrueType font '", path, "'");
+
+            const auto glyphSize = face->glyph->bitmap.pitch * face->glyph->bitmap.rows;
+            if(!glyphSize) continue;
+
+            GLYPH_PIXEL_DATA.clear();
+            GLYPH_PIXEL_DATA.resize(glyphSize << 2);
+
+            for(SIZE_T t = 0; t < glyphSize; t++)
+            {
+                const auto pi= t<<2;
+                const auto p = face->glyph->bitmap.buffer[t];
+                GLYPH_PIXEL_DATA[pi + 0] = p;
+                GLYPH_PIXEL_DATA[pi + 1] = p;
+                GLYPH_PIXEL_DATA[pi + 2] = p;
+                GLYPH_PIXEL_DATA[pi + 3] = p;
+            }
+
+            result.Chars[c] = {
+                IVec2(face->glyph->bitmap.width, face->glyph->bitmap.rows),
+                IVec2(face->glyph->bitmap_left, face->glyph->bitmap_top),
+                static_cast<UINT32>(face->glyph->advance.x) >> 6,
+                GPUResourceManager::CreateTexture(SDL_GPU_TEXTUREUSAGE_SAMPLER | SDL_GPU_TEXTUREUSAGE_COLOR_TARGET, face->glyph->bitmap.width, face->glyph->bitmap.rows, GLYPH_PIXEL_DATA.data()),
+            };
+        }
+
+        FT_Done_Face(face);
+
+        s_fonts[name] = IA_MOVE(result);
+    }
+} // namespace ia::iae