💿🐜 Antkeeper source code
https://antkeeper.com
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314 lines
7.9 KiB
314 lines
7.9 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "scene/text.hpp"
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#include "renderer/material.hpp"
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#include "renderer/vertex-attribute.hpp"
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#include "math/vector-operators.hpp"
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#include <cstddef>
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#include <codecvt>
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namespace scene {
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text::text():
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local_bounds{{0, 0, 0}, {0, 0, 0}},
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world_bounds{{0, 0, 0}, {0, 0, 0}},
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material(nullptr),
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font(nullptr),
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direction(type::text_direction::ltr),
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content_u8(std::string()),
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content_u32(std::u32string()),
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color({0.0f, 0.0f, 0.0f, 1.0f}),
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vertex_stride(0),
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vertex_count(0),
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vao(nullptr),
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vbo(nullptr)
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{
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// Allocate VBO and VAO
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vbo = new gl::vertex_buffer(0, nullptr, gl::buffer_usage::static_draw);
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vao = new gl::vertex_array();
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// Calculate vertex stride
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vertex_stride = (3 + 2 + 4) * sizeof(float);
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// Init vertex attribute offset
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std::size_t attribute_offset = 0;
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// Define vertex position attribute
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gl::vertex_attribute position_attribute;
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position_attribute.buffer = vbo;
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position_attribute.offset = attribute_offset;
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position_attribute.stride = vertex_stride;
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position_attribute.type = gl::vertex_attribute_type::float_32;
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position_attribute.components = 3;
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attribute_offset += position_attribute.components * sizeof(float);
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// Define vertex UV attribute
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gl::vertex_attribute uv_attribute;
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uv_attribute.buffer = vbo;
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uv_attribute.offset = attribute_offset;
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uv_attribute.stride = vertex_stride;
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uv_attribute.type = gl::vertex_attribute_type::float_32;
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uv_attribute.components = 2;
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attribute_offset += uv_attribute.components * sizeof(float);
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// Define vertex color attribute
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gl::vertex_attribute color_attribute;
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color_attribute.buffer = vbo;
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color_attribute.offset = attribute_offset;
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color_attribute.stride = vertex_stride;
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color_attribute.type = gl::vertex_attribute_type::float_32;
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color_attribute.components = 4;
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attribute_offset += color_attribute.components * sizeof(float);
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// Bind vertex attributes to VAO
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vao->bind(render::vertex_attribute::position, position_attribute);
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vao->bind(render::vertex_attribute::uv, uv_attribute);
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vao->bind(render::vertex_attribute::color, color_attribute);
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}
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text::~text()
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{
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// Free VAO and VBO
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delete vao;
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delete vbo;
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}
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void text::set_material(::material* material)
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{
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this->material = material;
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}
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void text::set_font(const type::bitmap_font* font)
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{
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if (this->font != font)
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{
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this->font = font;
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// Update text in VBO
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update_content();
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}
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}
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void text::set_direction(type::text_direction direction)
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{
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if (this->direction != direction)
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{
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this->direction = direction;
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// Update text in VBO
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update_content();
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}
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}
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void text::set_content(const std::string& content)
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{
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// If content has changed
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if (content_u8 != content)
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{
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// Update UTF-8 content
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content_u8 = content;
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// Convert UTF-8 content to UTF-32
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std::wstring_convert<std::codecvt_utf8<char32_t>, char32_t> convert;
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content_u32 = convert.from_bytes(content_u8.c_str());
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// Update text in VBO
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update_content();
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}
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}
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void text::set_color(const float4& color)
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{
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this->color = color;
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// Update color in VBO
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update_color();
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}
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void text::transformed()
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{
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world_bounds = aabb_type::transform(local_bounds, get_transform());
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}
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void text::update_tweens()
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{
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object_base::update_tweens();
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if (material)
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{
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material->update_tweens();
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}
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}
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void text::update_content()
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{
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// If no valid font or no text, clear vertex count
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if (!font || content_u32.empty())
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{
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vertex_count = 0;
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return;
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}
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// Calculate new vertex count and minimum vertex buffer size
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std::size_t vertex_count = content_u32.length() * 6;
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std::size_t min_vertex_buffer_size = vertex_count * vertex_stride;
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// Expand vertex data buffer to accommodate vertices
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if (vertex_data.size() < min_vertex_buffer_size)
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vertex_data.resize(min_vertex_buffer_size);
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// Get font metrics and bitmap
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const type::font_metrics& font_metrics = font->get_font_metrics();
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const image& font_bitmap = font->get_bitmap();
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// Init pen position
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float2 pen_position = {0.0f, 0.0f};
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// Reset local-space bounds
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local_bounds = {{0, 0, 0}, {0, 0, 0}};
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// Generate vertex data
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char32_t previous_code = 0;
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float* v = reinterpret_cast<float*>(vertex_data.data());
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for (char32_t code: content_u32)
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{
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// Apply kerning
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if (previous_code)
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{
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pen_position.x += font->get_kerning(previous_code, code).x;
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}
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if (font->contains(code))
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{
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// Get glyph
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const type::bitmap_glyph& glyph = font->get_glyph(code);
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// Calculate vertex positions
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float2 positions[6];
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positions[0] = pen_position + glyph.metrics.horizontal_bearing;
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positions[1] = {positions[0].x, positions[0].y - glyph.metrics.height};
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positions[2] = {positions[0].x + glyph.metrics.width, positions[1].y};
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positions[3] = {positions[2].x, positions[0].y};
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positions[4] = positions[0];
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positions[5] = positions[2];
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// Calculate vertex UVs
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float2 uvs[6];
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uvs[0] = {static_cast<float>(glyph.position.x), static_cast<float>(glyph.position.y)};
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uvs[1] = {uvs[0].x, uvs[0].y + glyph.metrics.height};
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uvs[2] = {uvs[0].x + glyph.metrics.width, uvs[1].y};
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uvs[3] = {uvs[2].x, uvs[0].y};
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uvs[4] = uvs[0];
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uvs[5] = uvs[2];
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for (int i = 0; i < 6; ++i)
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{
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// Round positions
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positions[i].x = std::round(positions[i].x);
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positions[i].y = std::round(positions[i].y);
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// Normalize UVs
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uvs[i].x = uvs[i].x / static_cast<float>(font_bitmap.get_width());
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uvs[i].y = uvs[i].y / static_cast<float>(font_bitmap.get_height());
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}
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// Add vertex to vertex data buffer
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for (int i = 0; i < 6; ++i)
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{
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*(v++) = positions[i].x;
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*(v++) = positions[i].y;
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*(v++) = 0.0f;
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*(v++) = uvs[i].x;
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*(v++) = uvs[i].y;
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*(v++) = color.x;
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*(v++) = color.y;
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*(v++) = color.z;
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*(v++) = color.w;
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}
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// Advance pen position
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pen_position.x += glyph.metrics.horizontal_advance;
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// Update local-space bounds
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for (int i = 0; i < 4; ++i)
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{
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const float2& position = positions[i];
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for (int j = 0; j < 2; ++j)
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{
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local_bounds.min_point[j] = std::min<float>(local_bounds.min_point[j], position[j]);
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local_bounds.max_point[j] = std::max<float>(local_bounds.max_point[j], position[j]);
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}
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}
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}
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else
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{
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// Glyph not in font, zero vertex data
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for (std::size_t i = 0; i < (6 * 9); ++i)
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*(v++) = 0.0f;
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}
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// Handle newlines
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if (code == static_cast<char32_t>('\n'))
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{
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pen_position.x = 0.0f;
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pen_position.y -= font_metrics.linegap;
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}
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// Update previous UTF-32 character code
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previous_code = code;
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}
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// Resize VBO, if necessary, and upload vertex data
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if (vertex_count > this->vertex_count)
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{
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this->vertex_count = vertex_count;
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vbo->resize(min_vertex_buffer_size, vertex_data.data());
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}
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else
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{
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vbo->write(0, min_vertex_buffer_size, vertex_data.data());
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}
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// Update vertex count
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this->vertex_count = vertex_count;
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// Update world-space bounds
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transformed();
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}
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void text::update_color()
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{
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float* v = reinterpret_cast<float*>(vertex_data.data());
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for (std::size_t i = 0; i < vertex_count; ++i)
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{
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// Skip vertex position (vec3) and vertex UV (vec2)
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v += (3 + 2);
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// Update vertex color
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*(v++) = color.x;
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*(v++) = color.y;
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*(v++) = color.z;
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*(v++) = color.w;
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}
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// Update VBO
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vbo->write(0, vertex_count * vertex_stride, vertex_data.data());
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}
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} // namespace scene
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