437 lines
16 KiB
C++
437 lines
16 KiB
C++
#pragma once
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/*
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program 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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* This program 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 this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_WITH_GRAPHICS_FONT_RENDERER_H
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#define BLT_WITH_GRAPHICS_FONT_RENDERER_H
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#include <blt/gfx/font/font.h>
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#include <blt/gfx/texture.h>
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#include <blt/gfx/shader.h>
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#include <blt/gfx/model.h>
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#include <blt/gfx/framebuffer.h>
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#include <blt/std/hashmap.h>
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#include <blt/std/binary_tree.h>
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namespace blt::gfx
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{
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class font_texture_atlas : public texture_gl2D
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{
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public:
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struct bounded_t
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{
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font::glyph_t glyph;
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// starting point inside texture atlas
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blt::vec2ui min;
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// ending point of the glyph, inside texture atlas
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blt::vec2ui max;
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};
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struct added_font_results_t
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{
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blt::u64 last_inserted_index;
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blt::u64 min_index_used;
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blt::u64 max_index_used;
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};
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public:
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explicit font_texture_atlas(blt::i32 dimensions, blt::u32 padding);
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added_font_results_t add_font(const font::font_file_t& file, float size);
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added_font_results_t add_font(const font::font_file_t& file, blt::u64 start, float size);
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bounded_t& get_glyph(blt::u64 c, std::string_view font)
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{ return glyphs.at(font).at(c); }
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[[nodiscard]] const bounded_t& get_glyph(blt::u64 c, std::string_view font) const
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{ return glyphs.at(font).at(c); }
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private:
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blt::hashmap_t<std::string, blt::hashmap_t<blt::u64, bounded_t>> glyphs;
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blt::u32 used_width = 0;
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blt::u32 used_height = 0;
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blt::u32 padding;
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};
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class font_generator_t
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{
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public:
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struct size_bounds_t
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{
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float min_size, max_size;
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blt::u64 min_char, max_char;
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};
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struct bounded_font_t
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{
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font_texture_atlas* atlas;
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blt::u64 min_char, max_char;
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bounded_font_t(font_texture_atlas* atlas, u64 minChar, u64 maxChar): atlas(atlas), min_char(minChar), max_char(maxChar)
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{}
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// replace with font -> char range. use scaling.
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};
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public:
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explicit font_generator_t(blt::i32 dimensions, blt::u32 padding, float gen_size);
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void add_font(const font::font_file_t& file);
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inline font_texture_atlas& get_texture(const std::string& font, blt::u64 c)
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{
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for (auto& atlas : font_associations[font])
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{
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if (c >= atlas.min_char && c <= atlas.max_char)
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return *atlas.atlas;
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}
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throw std::runtime_error("Character not found inside atlases with font '" + font + "'");
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}
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[[nodiscard]] blt::i32 get_dimensions() const
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{ return dimensions; }
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[[nodiscard]] float get_generated_size() const
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{ return gen_size; }
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private:
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blt::i32 dimensions;
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blt::u32 padding;
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std::vector<std::unique_ptr<font_texture_atlas>> atlases;
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blt::hashmap_t<std::string, std::vector<bounded_font_t>> font_associations;
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float gen_size;
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};
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class font_renderer_t
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{
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public:
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static constexpr blt::vec2f DEFAULT_SCALE{1, 1};
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static constexpr blt::vec4 DEFAULT_COLOR = blt::make_color(0.8, 0.8, 0.8);
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struct render_context_t
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{
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blt::vec2f position, bounds;
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blt::vec4 color = DEFAULT_COLOR;
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float z_index = 0;
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float current_size = 0;
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float rotation = 0;
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explicit render_context_t(float current_size): current_size(current_size)
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{}
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render_context_t& setPosition(float x, float y)
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{
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position = {x, y};
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return *this;
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}
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render_context_t& setPosition(const blt::vec2f& new_position)
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{
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position = new_position;
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return *this;
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}
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render_context_t& setRotation(float r)
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{
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rotation = r;
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return *this;
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}
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render_context_t& setColor(const blt::vec4f& new_color)
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{
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color = new_color;
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return *this;
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}
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render_context_t& setColor(float r, float g, float b, float a = 1)
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{
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color = {r, g, b, a};
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return *this;
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}
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render_context_t& setBounds(const blt::vec2f& new_bounds)
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{
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bounds = new_bounds;
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return *this;
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}
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render_context_t& setBounds(float width, float height)
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{
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return setBounds({width, height});
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}
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render_context_t& setUnrestrictedBounds()
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{
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bounds = {};
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return *this;
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}
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render_context_t& setSize(const float new_scale)
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{
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current_size = new_scale;
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return *this;
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}
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render_context_t& setZIndex(float new_z_index)
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{
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z_index = new_z_index;
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return *this;
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}
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[[nodiscard]] const vec2f& getPosition() const
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{ return position; }
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[[nodiscard]] const vec2f& getBounds() const
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{ return bounds; }
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[[nodiscard]] float getSize() const
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{ return current_size; }
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[[nodiscard]] float getRotation() const
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{ return rotation; }
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[[nodiscard]] const vec4& getColor() const
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{ return color; }
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};
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struct text_index_t
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{
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std::string text;
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std::string font;
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bool operator==(const text_index_t& rhs) const;
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bool operator!=(const text_index_t& rhs) const;
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};
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struct compiled_text_t
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{
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friend font_renderer_t;
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public:
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compiled_text_t& setText(std::string_view str, float size, std::string_view font = "__default");
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compiled_text_t& recompile();
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compiled_text_t& setPosition(float x, float y)
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{
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position = {x, y};
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return *this;
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}
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compiled_text_t& setPosition(const blt::vec2f& pos)
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{
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position = pos;
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return *this;
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}
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compiled_text_t& setRotation(float r)
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{
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rotation = r;
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return *this;
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}
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compiled_text_t& setBounds(const blt::vec2f& limit)
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{
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if (limit == bounds)
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return *this;
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bounds = limit;
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recompile();
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return *this;
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}
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compiled_text_t& setBounds(float width, float height)
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{
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return setBounds({width, height});
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}
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compiled_text_t& setUnrestrictedBounds()
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{
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bounds = {};
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return *this;
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}
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compiled_text_t& setColor(const blt::vec4f& c)
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{
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color = c;
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return *this;
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}
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compiled_text_t& setColor(float r, float g, float b, float a = 1)
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{
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color = {r, g, b, a};
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return *this;
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}
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compiled_text_t& setSize(float size)
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{
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if (current_size == size)
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return *this;
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current_size = size;
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scale = {size / generator.get_generated_size(), size / generator.get_generated_size()};
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// size only changes computation if there are bounds on the text.
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if (bounds.x() != 0 || bounds.y() != 0)
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recompile();
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return *this;
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}
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compiled_text_t& setZIndex(float s)
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{
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z_index = s;
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return *this;
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}
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[[nodiscard]] const vec2f& getBounds() const
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{ return bounds; }
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[[nodiscard]] const vec2f& getPosition() const
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{ return position; }
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[[nodiscard]] const vec2f& getScale() const
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{ return scale; }
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[[nodiscard]] const vec4f& getColor() const
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{ return color; }
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[[nodiscard]] float getZIndex() const
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{ return z_index; }
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[[nodiscard]] float getRotation() const
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{ return rotation; }
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void save_to(render_context_t& save)
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{
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save.position = position;
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save.bounds = bounds;
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save.color = color;
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save.z_index = z_index;
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save.current_size = current_size;
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save.rotation = rotation;
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}
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void restore_from(const render_context_t& restore)
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{
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setPosition(restore.position);
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setBounds(restore.bounds);
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setColor(restore.color);
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setZIndex(restore.z_index);
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setSize(restore.current_size);
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setRotation(restore.rotation);
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}
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private:
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explicit compiled_text_t(font_generator_t& generator);
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void bind() const
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{
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vao.bind();
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}
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void draw();
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struct text_render_info_t
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{
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font_texture_atlas* texture = nullptr;
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blt::size_t render_start = 0;
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blt::size_t render_count = 0;
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text_render_info_t(font_texture_atlas* texture, size_t renderStart, size_t renderCount):
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texture(texture), render_start(renderStart), render_count(renderCount)
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{}
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};
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font_generator_t& generator;
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std::string contents, font;
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vertex_array_t vao{};
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std::vector<text_render_info_t> renders;
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blt::vec2f position, bounds;
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blt::vec2f scale = DEFAULT_SCALE;
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blt::vec4 color = DEFAULT_COLOR;
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float z_index = 0;
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float current_size = 0;
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float rotation = 0;
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};
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public:
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explicit font_renderer_t();
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void create_default(float gen_size = 250, blt::i32 dimensions = 0);
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void create(float gen_size, blt::i32 dimensions = 0);
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void cleanup();
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void add_font(const font::font_file_t& file)
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{
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generator->add_font(file);
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}
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void add_default_font(std::string_view path, std::string_view name = "__default");
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void add_default_font(const blt::u8* data, blt::size_t size, bool compressed = false, std::string_view name = "__default");
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compiled_text_t* create_text(std::string_view str, float size, std::string_view font = "__default");
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render_context_t& render_text(std::string_view str, float size, std::string_view font = "__default");
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void destroy_text(compiled_text_t* text);
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void render();
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private:
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std::unique_ptr<compiled_text_t> allocate_text();
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std::unique_ptr<font_generator_t> generator;
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std::unique_ptr<shader_t> font_shader;
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blt::hashmap_t<text_index_t, compiled_text_t*> rendered_strings;
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blt::hashmap_t<compiled_text_t*, text_index_t> text_ptr_to_text_index;
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blt::hashmap_t<compiled_text_t*, std::vector<render_context_t>> render_list;
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blt::hashset_t<compiled_text_t*> last_rendered_strings;
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blt::hashset_t<compiled_text_t*> currently_rendered_strings;
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blt::hashmap_t<compiled_text_t*, blt::size_t> text_ptr_to_index;
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std::vector<std::unique_ptr<compiled_text_t>> added_texts;
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std::vector<std::unique_ptr<compiled_text_t>> cached_deallocated_text_objects;
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};
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}
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namespace blt::gfx::detail
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{
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inline void hash_combine(std::size_t& seed, const std::size_t& value)
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{
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seed ^= value + 0x9e3779b9 + (seed << 6) + (seed >> 2);
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}
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}
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// Specialization of std::hash for text_index_t
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template<>
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struct std::hash<blt::gfx::font_renderer_t::text_index_t>
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{
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std::size_t operator()(const blt::gfx::font_renderer_t::text_index_t& key) const
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{
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blt::size_t hash = 0;
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blt::gfx::detail::hash_combine(hash, std::hash<std::string>{}(key.text));
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blt::gfx::detail::hash_combine(hash, std::hash<std::string>{}(key.font));
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return hash;
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}
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};
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#endif //BLT_WITH_GRAPHICS_FONT_RENDERER_H
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