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/**
* Copyright (C) 2026 andromeda
*
* 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 <https://www.gnu.org/licenses/>.
**/
module rfont;
const int MAX_GLYPHS = 256;
const int INIT_VERTS = 20 * MAX_GLYPHS;
alias Texture = usz;
alias Surface = void*;
struct Render_data
{
float* verts;
float* tcoords;
ushort* elements;
Texture atlas;
usz nverts;
usz nelements;
}
alias Renderer_proc_size = fn usz();
alias Renderer_proc_initPtr = fn void(void*);
alias Renderer_proc_create_atlas = fn Texture(void*, uint, uint);
alias Renderer_proc_free_atlas = fn void(void*, Texture);
alias Renderer_proc_bitmap_to_atlas = fn void(void*, Texture, uint, uint, uint, char*, float, float, float*, float*);
alias Renderer_proc_render = fn void(void*, Render_data*);
alias Renderer_proc_set_framebuffer = fn void(void*, uint, uint);
alias Renderer_proc_set_color = fn void(void*, float, float, float, float);
alias Renderer_proc_set_surface = fn void(void*, Surface);
alias Renderer_proc_freePtr = fn void(void*);
struct Renderer_proc
{
Renderer_proc_size size;
Renderer_proc_initPtr initPtr;
Renderer_proc_create_atlas create_atlas;
Renderer_proc_free_atlas free_atlas;
Renderer_proc_bitmap_to_atlas bitmap_to_atlas;
Renderer_proc_render render;
Renderer_proc_set_framebuffer set_framebuffer;
Renderer_proc_set_color set_color;
Renderer_proc_set_surface set_surface;
Renderer_proc_freePtr freePtr;
}
struct Renderer
{
void* ctx;
Renderer_proc proc;
}
struct Font
{
Src* src;
float fheight;
float descent;
float numOfLongHorMetrics;
float space_adv;
uint maxHeight;
Glyph[MAX_GLYPHS] glyphs;
usz glyph_len;
Texture atlas;
usz atlasWidth;
usz atlasHeight;
float atlasX;
float atlasY;
float[INIT_VERTS * 3] verts;
float[INIT_VERTS * 2] tcoords;
ushort[INIT_VERTS * 6] elements;
}
struct Glyph
{
uint codepoint;
usz size;
int x;
int x2;
int y;
int y2;
Font* font;
int src;
float w;
float h;
float x1;
float y1;
float advance;
}
alias Src = void;
alias Glyph_fallback_callback = fn Glyph(Renderer*, Font*, uint, usz);
extern fn CChar* codepoint_to_utf8(uint) @cname("RFont_codepoint_to_utf8");
extern fn Font* font_init(Renderer*, ZString, uint, usz, usz) @cname("RFont_font_init");
extern fn Font* font_init_ptr(Renderer*, ZString, uint, usz, usz, Font*) @cname("RFont_font_init_ptr");
extern fn Font* font_init_data(Renderer*, char*, uint, usz, usz) @cname("RFont_font_init_data");
extern fn Font* font_init_data_ptr(Renderer*, char*, uint, usz, usz, Font*) @cname("RFont_font_init_data_ptr");
extern fn void font_free(Renderer*, Font*) @cname("RFont_font_free");
extern fn void font_free_ptr(Renderer*, Font*) @cname("RFont_font_free_ptr");
extern fn Glyph_fallback_callback set_glyph_fallback_callback(
Glyph_fallback_callback
) @cname("RFont_set_glyph_fallback_callback");
extern fn Glyph font_add_char(Renderer*, Font*, CChar, usz) @cname("RFont_font_add_char");
extern fn Glyph font_add_codepoint(Renderer*, Font*, uint, usz) @cname("RFont_font_add_codepoint");
extern fn Glyph font_add_codepoint_ex(Renderer*, Font*, uint, usz, char) @cname("RFont_font_add_codepoint_ex");
extern fn void font_add_string(Renderer*, Font*, ZString, usz*, usz) @cname("RFont_font_add_string");
extern fn void font_add_string_len(Renderer*, Font*, ZString, usz, usz*, usz) @cname("RFont_font_add_string_len");
extern fn void text_area(Renderer*, Font*, ZString, uint, uint*, uint*) @cname("RFont_text_area");
extern fn void text_area_spacing(
Renderer*,
Font*,
ZString,
float,
uint,
uint*,
uint*
) @cname("RFont_text_area_spacing");
extern fn void text_area_len(
Renderer*,
Font*,
ZString,
usz,
uint,
usz,
float,
uint*,
uint*
) @cname("RFont_text_area_len");
extern fn void draw_text(Renderer*, Font*, ZString, float, float, uint) @cname("RFont_draw_text");
extern fn void draw_text_spacing(
Renderer*,
Font*,
ZString,
float,
float,
uint,
float
) @cname("RFont_draw_text_spacing");
extern fn void draw_text_len(Renderer*, Font*, ZString, usz, float, float, uint, float) @cname("RFont_draw_text_len");
extern fn usz renderer_size(Renderer*) @cname("RFont_renderer_size");
extern fn Renderer* renderer_init(Renderer_proc) @cname("RFont_renderer_init");
extern fn void renderer_initPtr(Renderer_proc, void*, Renderer*) @cname("RFont_renderer_initPtr");
extern fn void renderer_set_framebuffer(Renderer*, uint, uint) @cname("RFont_renderer_set_framebuffer");
extern fn void renderer_set_surface(Renderer*, Surface) @cname("RFont_renderer_set_surface");
extern fn void renderer_set_color(Renderer*, float, float, float, float) @cname("RFont_renderer_set_color");
extern fn void renderer_free(Renderer*) @cname("RFont_renderer_free");
extern fn void renderer_freePtr(Renderer*) @cname("RFont_renderer_freePtr");
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