add freetype-based text rendering and box labels
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#include "render/TextRenderer.h"
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include "Environment.h"
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#include "render/OpenGlExtensions.h" // если у тебя там gl* указатели
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#include <iostream>
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namespace ZL {
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TextRenderer::~TextRenderer()
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{
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for (auto& kv : glyphs) {
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if (kv.second.texID) glDeleteTextures(1, &kv.second.texID);
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}
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glyphs.clear();
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if (vbo) glDeleteBuffers(1, &vbo);
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// if (vao) glDeleteVertexArrays(1, &vao);
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vao = 0;
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vbo = 0;
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}
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bool TextRenderer::init(Renderer& renderer, const std::string& ttfPath, int pixelSize)
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{
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r = &renderer;
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// Добавим шейдер (если у тебя shaderManager работает так же, как с default)
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// Подстрой под твой AddShaderFromFiles: тут без zip.
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r->shaderManager.AddShaderFromFiles(shaderName,
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"resources/shaders/text2d.vertex",
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"resources/shaders/text2d.fragment",
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"" // ZIP пустой
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);
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if (!loadGlyphs(ttfPath, pixelSize)) return false;
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// VAO/VBO для 6 вершин (2 треугольника) * (pos.xy + uv.xy) = 4 float
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// glGenVertexArrays(1, &vao);
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glGenBuffers(1, &vbo);
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//glBindVertexArray(vao);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(float) * 6 * 4, nullptr, GL_DYNAMIC_DRAW);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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return true;
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}
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bool TextRenderer::loadGlyphs(const std::string& ttfPath, int pixelSize)
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{
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FT_Library ft;
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if (FT_Init_FreeType(&ft)) {
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std::cerr << "FreeType: FT_Init_FreeType failed\n";
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return false;
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}
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FT_Face face;
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if (FT_New_Face(ft, ttfPath.c_str(), 0, &face)) {
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std::cerr << "FreeType: failed to load font: " << ttfPath << "\n";
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FT_Done_FreeType(ft);
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return false;
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}
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FT_Set_Pixel_Sizes(face, 0, pixelSize);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glyphs.clear();
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for (unsigned char c = 32; c < 128; ++c) {
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if (FT_Load_Char(face, c, FT_LOAD_RENDER)) {
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continue;
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}
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unsigned int tex;
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glGenTextures(1, &tex);
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glBindTexture(GL_TEXTURE_2D, tex);
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glTexImage2D(
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GL_TEXTURE_2D,
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0,
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GL_RED,
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face->glyph->bitmap.width,
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face->glyph->bitmap.rows,
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0,
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GL_RED,
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GL_UNSIGNED_BYTE,
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face->glyph->bitmap.buffer
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);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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GlyphInfo g;
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g.texID = tex;
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g.size = Eigen::Vector2f((float)face->glyph->bitmap.width, (float)face->glyph->bitmap.rows);
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g.bearing = Eigen::Vector2f((float)face->glyph->bitmap_left, (float)face->glyph->bitmap_top);
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g.advance = (unsigned int)face->glyph->advance.x;
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glyphs.emplace((char)c, g);
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}
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FT_Done_Face(face);
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FT_Done_FreeType(ft);
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glBindTexture(GL_TEXTURE_2D, 0);
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return true;
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}
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void TextRenderer::drawText(const std::string& text, float x, float y, float scale, bool centered)
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{
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if (!r) return;
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// Считаем ширину строки для центрирования
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float totalW = 0.0f;
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if (centered) {
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for (char ch : text) {
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auto it = glyphs.find(ch);
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if (it == glyphs.end()) continue;
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totalW += (it->second.advance >> 6) * scale;
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}
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x -= totalW * 0.5f;
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}
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r->shaderManager.PushShader(shaderName);
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// Орто-проекция в пикселях: (0..W, 0..H)
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// ВАЖНО: мы рисуем в координатах Game::drawBoxesLabels() как uiX/uiY
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// Здесь предположим, что (0,0) внизу слева.
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float W = (float)Environment::width;
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float H = (float)Environment::height;
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Eigen::Matrix4f proj = Eigen::Matrix4f::Identity();
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proj(0,0) = 2.0f / W;
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proj(1,1) = 2.0f / H;
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proj(0,3) = -1.0f;
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proj(1,3) = -1.0f;
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// uProjection
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r->RenderUniformMatrix4fv("uProjection", false, proj.data());
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r->RenderUniform1i("uText", 0);
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// белый цвет
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float color[3] = {1.0f, 1.0f, 1.0f};
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r->RenderUniform3fv("uColor", color);
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glActiveTexture(GL_TEXTURE0);
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// glBindVertexArray(vao);
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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r->EnableVertexAttribArray("vPosition");
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r->EnableVertexAttribArray("vTexCoord");
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r->VertexAttribPointer2fv("vPosition", 4 * sizeof(float), (const char*)0);
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r->VertexAttribPointer2fv("vTexCoord", 4 * sizeof(float), (const char*)(2 * sizeof(float)));
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float penX = x;
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float penY = y;
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for (char ch : text) {
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auto it = glyphs.find(ch);
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if (it == glyphs.end()) continue;
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const GlyphInfo& g = it->second;
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float xpos = penX + g.bearing.x() * scale;
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float ypos = penY - (g.size.y() - g.bearing.y()) * scale;
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float w = g.size.x() * scale;
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float h = g.size.y() * scale;
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// 2 треугольника
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float verts[6][4] = {
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{ xpos, ypos + h, 0.0f, 0.0f },
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{ xpos, ypos, 0.0f, 1.0f },
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{ xpos + w, ypos, 1.0f, 1.0f },
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{ xpos, ypos + h, 0.0f, 0.0f },
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{ xpos + w, ypos, 1.0f, 1.0f },
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{ xpos + w, ypos + h, 1.0f, 0.0f }
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};
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glBindTexture(GL_TEXTURE_2D, g.texID);
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glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(verts), verts);
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glDrawArrays(GL_TRIANGLES, 0, 6);
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penX += (g.advance >> 6) * scale;
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}
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// cleanup
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glBindTexture(GL_TEXTURE_2D, 0);
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glBindBuffer(GL_ARRAY_BUFFER, 0);
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r->DisableVertexAttribArray("vPosition");
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r->DisableVertexAttribArray("vTexCoord");
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r->shaderManager.PopShader();
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}
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} // namespace ZL
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@@ -0,0 +1,41 @@
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#pragma once
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#include <string>
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#include <memory>
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#include <vector>
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#include <unordered_map>
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#include <Eigen/Dense>
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#include "render/Renderer.h"
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namespace ZL {
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struct GlyphInfo {
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unsigned int texID = 0; // GL texture for glyph
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Eigen::Vector2f size; // glyph size in pixels
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Eigen::Vector2f bearing; // offset from baseline
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unsigned int advance = 0; // advance.x in 1/64 pixels
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};
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class TextRenderer {
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public:
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TextRenderer() = default;
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~TextRenderer();
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bool init(Renderer& renderer, const std::string& ttfPath, int pixelSize);
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void drawText(const std::string& text, float x, float y, float scale, bool centered);
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private:
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bool loadGlyphs(const std::string& ttfPath, int pixelSize);
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Renderer* r = nullptr;
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std::unordered_map<char, GlyphInfo> glyphs;
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// OpenGL objects for a dynamic quad
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unsigned int vao = 0;
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unsigned int vbo = 0;
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std::string shaderName = "text2d";
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};
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} // namespace ZL
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