#pragma once
/*
* Copyright (C) 2024 Brett Terpstra
*
* 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 .
*/
#ifndef BLT_WITH_GRAPHICS_FONT_RENDERER_H
#define BLT_WITH_GRAPHICS_FONT_RENDERER_H
#include
#include
#include
#include
#include
#include
namespace blt::gfx
{
class font_texture_atlas : public texture_gl2D
{
public:
struct bounded_t
{
font::glyph_t glyph;
// starting point inside texture atlas
blt::vec2ui min;
// ending point of the glyph, inside texture atlas
blt::vec2ui max;
};
struct added_font_results_t
{
blt::u64 last_inserted_index;
blt::u64 min_index_used;
blt::u64 max_index_used;
};
public:
explicit font_texture_atlas(blt::i32 dimensions, blt::u32 padding);
added_font_results_t add_font(const font::font_file_t& file, float size);
added_font_results_t add_font(const font::font_file_t& file, blt::u64 start, float size);
bounded_t& get_glyph(blt::u64 c, float size)
{ return glyphs.at(size).at(c); }
[[nodiscard]] const bounded_t& get_glyph(blt::u64 c, float size) const
{ return glyphs.at(size).at(c); }
private:
blt::hashmap_t> glyphs;
blt::u32 used_width = 0;
blt::u32 used_height = 0;
blt::u32 padding;
};
class font_generator_t
{
public:
struct bounded_font_t
{
std::unique_ptr atlas;
float min_size, max_size;
blt::u64 min_char, max_char;
bounded_font_t(std::unique_ptr atlas, float minSize, float maxSize, u64 minChar, u64 maxChar):
atlas(std::move(atlas)), min_size(minSize), max_size(maxSize), min_char(minChar), max_char(maxChar)
{}
};
public:
explicit font_generator_t(blt::i32 dimensions, blt::u32 padding, const std::vector& sizes_to_generate);
void add_font(const font::font_file_t& file);
inline font_texture_atlas& get_texture(float size, blt::u64 c)
{
for (auto& atlas : atlases)
{
if (!(size >= atlas.min_size && size <= atlas.max_size))
continue;
if (c >= atlas.min_char && c <= atlas.max_char)
return *atlas.atlas;
}
throw std::runtime_error("Character not found inside atlases at this size");
}
[[nodiscard]] blt::i32 get_dimensions() const
{ return dimensions; }
private:
blt::i32 dimensions;
blt::u32 padding;
std::vector atlases;
// doesn't make sense to store this.
std::vector sizes_to_generate;
};
class font_renderer_t
{
public:
struct compiled_text_t
{
friend font_renderer_t;
public:
explicit compiled_text_t(font_generator_t& generator);
void change_text(std::string_view str, float size);
compiled_text_t& setPosition(const blt::vec2f& pos)
{
position = pos;
return *this;
}
compiled_text_t& setScale(const blt::vec2f& s)
{
scale = s;
return *this;
}
compiled_text_t& setColor(const blt::vec4f& c)
{
color = c;
return *this;
}
compiled_text_t& setPosition(float x, float y)
{
position = {x, y};
return *this;
}
compiled_text_t& setScale(float x, float y)
{
scale = {x, y};
return *this;
}
compiled_text_t& setColor(float r, float g, float b, float a = 1)
{
color = {r, g, b, a};
return *this;
}
compiled_text_t& setZIndex(float s)
{
z_index = s;
return *this;
}
[[nodiscard]] const vec2f& getPosition() const
{ return position; }
[[nodiscard]] const vec2f& getScale() const
{ return scale; }
[[nodiscard]] const vec4f& getColor() const
{ return color; }
[[nodiscard]] float getZIndex() const
{ return z_index; }
private:
void draw();
struct text_render_info_t
{
font_texture_atlas* texture = nullptr;
blt::size_t render_start = 0;
blt::size_t render_count = 0;
text_render_info_t(font_texture_atlas* texture, size_t renderStart, size_t renderCount):
texture(texture), render_start(renderStart), render_count(renderCount)
{}
};
font_generator_t& generator;
vertex_array_t vao{};
std::vector renders;
blt::vec2f position;
blt::vec2f scale = {1, 1};
blt::vec4 color = blt::make_color(1, 1, 1);
float z_index = 0;
};
public:
explicit font_renderer_t();
void create_default(blt::i32 dimensions = 0);
void create(const std::vector& generated_font_sizes, blt::i32 dimensions = 0);
void cleanup();
void add_font(const font::font_file_t& file)
{
generator->add_font(file);
}
void add_default_font(std::string_view path);
void add_default_font(const blt::u8* data, blt::size_t size, bool compressed = false);
compiled_text_t* create_text(std::string_view str, float size);
void destroy_text(compiled_text_t* text);
void render();
private:
std::unique_ptr generator;
std::unique_ptr font_shader;
blt::hashmap_t text_ptr_to_index;
std::vector> added_texts;
std::vector> cached_text_objects;
};
}
#endif //BLT_WITH_GRAPHICS_FONT_RENDERER_H