working version of text rendering
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ohyzha
@@ -5,44 +5,123 @@
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*/
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#include "Text.hpp"
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#include "Scene/Geometry.hpp"
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#include "Scene/Material.hpp"
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#include "Scene/Vertex.hpp"
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#include "Scene/UniformBuffer.hpp"
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#include "Scene/FontAtlasGenerator.hpp"
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#include "Base/Logger.hpp"
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#include "fmt/core.h"
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#include "msdfgen.h"
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#include "msdfgen-ext.h"
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#include "msdf-atlas-gen/msdf-atlas-gen.h"
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namespace OpenVulkano::Scene
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{
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using namespace msdfgen;
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using namespace msdf_atlas;
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void Text::Init(const std::string_view fontFile, char8_t symbol, const std::string_view outputFile)
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Text::~Text()
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{
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delete m_mesh;
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delete m_material;
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}
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void Text::GenerateText(const std::string& text, const Math::Vector3f& pos)
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{
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FreetypeHandle *ft = initializeFreetype();
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if (!ft)
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if (!m_fontAtlasGenerator)
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{
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throw std::runtime_error("Failed to initialize freetype");
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Logger::RENDER->error("Can't draw text. FontAtlasGenerator is nullptr");
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return;
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}
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FontHandle *font = loadFont(ft, fontFile.data());
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if (!font)
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if (m_mesh)
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{
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deinitializeFreetype(ft);
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throw std::runtime_error(fmt::format("Failed to load font freetype from file {0}", fontFile.data()));
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delete m_mesh;
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m_mesh = nullptr;
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}
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if (m_material)
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{
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delete m_material;
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m_material = nullptr;
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}
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if (text.empty())
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{
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return;
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}
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std::map<unicode_t, GlyphInfo>& symbols = m_fontAtlasGenerator->GetAtlasInfo();
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if (symbols.empty())
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{
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throw std::runtime_error("Glyphs are not loaded");
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}
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Shape shape;
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if (loadGlyph(shape, font, symbol, FONT_SCALING_EM_NORMALIZED))
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m_mesh = new Geometry();
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m_material = new Material();
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m_mesh->freeAfterUpload = false;
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m_mesh->Init(text.size() * 4, text.size() * 6);
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struct Bbox
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{
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shape.normalize();
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Bitmap<float, 1> sdf(m_cfg.outputSize, m_cfg.outputSize);
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// scale, translation (in em's)
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Projection proj(m_cfg.outputSize, Vector2(0.125, 0.125));
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// distance mapping
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Range rng(0.075);
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SDFTransformation t(proj, rng);
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generateSDF(sdf, shape, t);
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savePng(sdf, outputFile.data());
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double l = 0, r = 0, t = 0, b = 0;
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};
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double cursorX = pos.x;
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for (size_t i = 0; i < text.size(); i++)
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{
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unicode_t c = text[i];
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if (symbols.find(c) != symbols.end())
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{
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Bbox glyphBaselineBbox, glyphAtlasBbox;
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int vIdx = i * 4;
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uint32_t indices[] = { 1 + vIdx, 2 + vIdx, 3 + vIdx, 1 + vIdx, 3 + vIdx, 0 + vIdx };
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GlyphInfo& info = symbols.at(c);
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info.geometry.getQuadPlaneBounds(glyphBaselineBbox.l, glyphBaselineBbox.b, glyphBaselineBbox.r,
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glyphBaselineBbox.t);
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info.geometry.getQuadAtlasBounds(glyphAtlasBbox.l, glyphAtlasBbox.b, glyphAtlasBbox.r,
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glyphAtlasBbox.t);
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double bearingX = info.glyphBox.bounds.l;
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double bearingY = info.glyphBox.bounds.t;
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double w = glyphBaselineBbox.r - glyphBaselineBbox.l;
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double h = glyphBaselineBbox.t - glyphBaselineBbox.b;
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double l = glyphAtlasBbox.l;
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double r = glyphAtlasBbox.r;
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double t = glyphAtlasBbox.t;
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double b = glyphAtlasBbox.b;
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double ax = cursorX + bearingX;
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double ay = pos.y - (h - bearingY);
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m_material->texture = &info.texture;
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m_mesh->vertices[vIdx].position.x = ax;
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m_mesh->vertices[vIdx].position.y = ay;
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m_mesh->vertices[vIdx].position.z = 1;
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m_mesh->vertices[vIdx].textureCoordinates.x = l / info.texture.resolution.x;
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m_mesh->vertices[vIdx].textureCoordinates.y = b / info.texture.resolution.y;
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m_mesh->vertices[vIdx + 1].position.x = ax + w;
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m_mesh->vertices[vIdx + 1].position.y = ay;
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m_mesh->vertices[vIdx + 1].position.z = 1;
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m_mesh->vertices[vIdx + 1].textureCoordinates.x = r / info.texture.resolution.x;
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m_mesh->vertices[vIdx + 1].textureCoordinates.y = b / info.texture.resolution.y;
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m_mesh->vertices[vIdx + 2].position.x = ax + w;
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m_mesh->vertices[vIdx + 2].position.y = ay + h;
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m_mesh->vertices[vIdx + 2].position.z = 1;
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m_mesh->vertices[vIdx + 2].textureCoordinates.x = r / info.texture.resolution.x;
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m_mesh->vertices[vIdx + 2].textureCoordinates.y = t / info.texture.resolution.y;
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m_mesh->vertices[vIdx + 3].position.x = ax;
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m_mesh->vertices[vIdx + 3].position.y = ay + h;
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m_mesh->vertices[vIdx + 3].position.z = 1;
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m_mesh->vertices[vIdx + 3].textureCoordinates.x = l / info.texture.resolution.x;
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m_mesh->vertices[vIdx + 3].textureCoordinates.y = t / info.texture.resolution.y;
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m_mesh->SetIndices(indices, 6, 6 * i);
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// TODO: change to lower value(or ideally remove completely) to avoid overlapping and make less space between symbols
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// when setting for depth comparison operator will be available( <= )
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cursorX += info.glyphBox.advance +0.08;
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}
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else
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{
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// throw ? replace with ? character (if available) ?
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Logger::RENDER->error(fmt::format("Could not find glyph for character", c));
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}
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}
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destroyFont(font);
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deinitializeFreetype(ft);
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}
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}
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