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Rewrite fnl font renderer

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Only unscaled glyph bitmaps are now cached in regular memory. Scaled
glyphs are stored as textures on the GPU. Only the alpha channel on
glyph textures is used, with the color being provided as an input to the
shader.

Outline and bold rendering is improved by using a simple dilate shader.
This looks okay but could be improved (the result is a bit blurry
still).
This commit is contained in:
Nunuhara Cabbage
2022-04-28 19:13:27 -07:00
parent 8fb0153963
commit 9089fa1fd1
6 changed files with 372 additions and 136 deletions
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include/gfx/gfx.h
+10 -6
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@@ -142,6 +142,7 @@ void gfx_copy_amap_height_blur(Texture *dst, int dx, int dy, Texture *src, int s
void gfx_copy_with_alpha_map(Texture *dst, int dx, int dy, Texture *src, int sx, int sy, int w, int h);
void gfx_fill_with_alpha(Texture *dst, int x, int y, int w, int h, int r, int g, int b, int a);
void gfx_copy_stretch_with_alpha_map(Texture *dst, int dx, int dy, int dw, int dh, Texture *src, int sx, int sy, int sw, int sh);
void gfx_draw_glyph(Texture *dst, float dx, int dy, Texture *glyph, SDL_Color color, float scale_x, float bold_width);
enum {
FW_NORMAL = 400,
@@ -211,6 +212,8 @@ struct fnl_font_inst {
int outline_size;
};
struct fnl_render_size;
struct text_style {
unsigned font_type;
float size;
@@ -222,13 +225,14 @@ struct text_style {
float space_scale_x;
float font_spacing;
struct fnl_font_size *font_size;
struct fnl_render_size *font_size;
};
struct fnl;
struct fnl_font_face;
float fnl_draw_text(struct fnl *fnl, struct text_style *ts, Texture *dst, float x, int y, char *text);
float fnl_size_text(struct fnl *fnl, struct text_style *ts, char *text);
void fnl_renderer_free(struct fnl *fnl);
void fnl_renderer_init(const char *path);
void fnl_renderer_fini(void);
float fnl_draw_text(struct text_style *ts, Texture *dst, float x, int y, char *text);
float fnl_size_text(struct text_style *ts, char *text);
float fnl_get_actual_font_size(int font_type, float size);
float fnl_get_actual_font_size_round_down(int font_type, float size);
#endif /* SYSTEM4_SDL_CORE_H */