font_system.h

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#pragma once
 
#include <containers/array.h>
#include <core_render_types.h>
#include <identifiers/khandle.h>
#include <math/math_types.h>
#include <strings/kname.h>
 
struct font_system_state;
 
typedef enum font_type {
    FONT_TYPE_BITMAP,
    FONT_TYPE_SYSTEM
} font_type;
 
typedef struct font_glyph {
    i32 codepoint;
    u16 x;
    u16 y;
    u16 width;
    u16 height;
    i16 x_offset;
    i16 y_offset;
    i16 x_advance;
    u8 page_id;
} font_glyph;
 
typedef struct font_kerning {
    i32 codepoint_0;
    i32 codepoint_1;
    i16 amount;
} font_kerning;
 
typedef struct font_page {
    kname image_asset_name;
} font_page;
 
ARRAY_TYPE(font_glyph);
ARRAY_TYPE(font_kerning);
ARRAY_TYPE(font_page);
 
typedef struct system_font_variant {
    // Handle to the base font.
    khandle base_font;
    // Handle to the font size variant.
    khandle variant;
} system_font_variant;
 
typedef struct font_system_bitmap_font_config {
    // The resource name.
    kname resource_name;
    // The resource name.
    kname package_name;
} font_system_bitmap_font_config;
 
typedef struct font_system_system_font_config {
    // The resource name.
    kname resource_name;
    // The resource name.
    kname package_name;
    // The default font size to be used with the system font.
    u16 default_size;
} font_system_system_font_config;
 
typedef struct font_system_config {
    u8 max_bitmap_font_count;
    u8 max_system_font_count;
 
    u8 bitmap_font_count;
    font_system_bitmap_font_config* bitmap_fonts;
 
    u8 system_font_count;
    font_system_system_font_config* system_fonts;
} font_system_config;
 
typedef struct font_geometry {
    u32 quad_count;
    u64 vertex_buffer_size;
    u64 index_buffer_size;
    vertex_2d* vertex_buffer_data;
    u32* index_buffer_data;
} font_geometry;
 
b8 font_system_deserialize_config(const char* config_str, font_system_config* out_config);
 
b8 font_system_initialize(u64* memory_requirement, void* memory, font_system_config* config);
 
void font_system_shutdown(struct font_system_state* state);
 
KAPI b8 font_system_bitmap_font_acquire(struct font_system_state* state, kname name, khandle* out_font);
 
KAPI b8 font_system_bitmap_font_load(struct font_system_state* state, kname asset_name, kname package_name);
 
KAPI b8 font_system_bitmap_font_measure_string(struct font_system_state* state, khandle font, const char* text, vec2* out_size);
 
KAPI ktexture font_system_bitmap_font_atlas_get(struct font_system_state* state, khandle font);
 
KAPI f32 font_system_bitmap_font_line_height_get(struct font_system_state* state, khandle font);
 
KAPI b8 font_system_bitmap_font_generate_geometry(struct font_system_state* state, khandle font, const char* text, font_geometry* out_geometry);
 
KAPI b8 font_system_system_font_acquire(struct font_system_state* state, kname name, u16 font_size, system_font_variant* out_variant);
 
KAPI b8 font_system_system_font_load(struct font_system_state* state, kname resource_name, kname package_name, u16 default_size);
 
KAPI b8 font_system_system_font_verify_atlas(struct font_system_state* state, system_font_variant variant, const char* text);
 
KAPI b8 font_system_system_font_measure_string(struct font_system_state* state, system_font_variant variant, const char* text, vec2* out_size);
 
KAPI f32 font_system_system_font_line_height_get(struct font_system_state* state, system_font_variant variant);
 
KAPI b8 font_system_system_font_generate_geometry(struct font_system_state* state, system_font_variant variant, const char* text, font_geometry* out_geometry);
 
KAPI ktexture font_system_system_font_atlas_get(struct font_system_state* state, system_font_variant variant);