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[sokol_imgui] add the optional backend interface for font management #994

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merged 2 commits into from
Mar 2, 2024
Merged

[sokol_imgui] add the optional backend interface for font management #994

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6d2eb39
[sokol_imgui] add optional backend interface for font creation/destr…
Feb 22, 2024
47db82e
[sokol_imgui] add optional argument to simgui_create_fonts_texture
Feb 22, 2024
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99 changes: 64 additions & 35 deletions util/sokol_imgui.h
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Original file line number Diff line number Diff line change
Expand Up @@ -521,6 +521,11 @@ typedef struct simgui_frame_desc_t {
float dpi_scale;
} simgui_frame_desc_t;

typedef struct simgui_font_tex_desc_t {
sg_filter min_filter;
sg_filter mag_filter;
} simgui_font_tex_desc_t;

SOKOL_IMGUI_API_DECL void simgui_setup(const simgui_desc_t* desc);
SOKOL_IMGUI_API_DECL void simgui_new_frame(const simgui_frame_desc_t* desc);
SOKOL_IMGUI_API_DECL void simgui_render(void);
Expand All @@ -543,6 +548,8 @@ SOKOL_IMGUI_API_DECL bool simgui_handle_event(const sapp_event* ev);
SOKOL_IMGUI_API_DECL int simgui_map_keycode(sapp_keycode keycode); // returns ImGuiKey_*
#endif
SOKOL_IMGUI_API_DECL void simgui_shutdown(void);
SOKOL_IMGUI_API_DECL void simgui_create_fonts_texture(const simgui_font_tex_desc_t* desc);
SOKOL_IMGUI_API_DECL void simgui_destroy_fonts_texture(void);

#ifdef __cplusplus
} // extern "C"
Expand All @@ -551,6 +558,7 @@ SOKOL_IMGUI_API_DECL void simgui_shutdown(void);
inline void simgui_setup(const simgui_desc_t& desc) { return simgui_setup(&desc); }
inline simgui_image_t simgui_make_image(const simgui_image_desc_t& desc) { return simgui_make_image(&desc); }
inline void simgui_new_frame(const simgui_frame_desc_t& desc) { return simgui_new_frame(&desc); }
inline void simgui_create_fonts_texture(const simgui_font_tex_desc_t& desc) { return simgui_create_fonts_texture(&desc); }

#endif
#endif /* SOKOL_IMGUI_INCLUDED */
Expand Down Expand Up @@ -2332,17 +2340,6 @@ SOKOL_API_IMPL void simgui_setup(const simgui_desc_t* desc) {
ib_desc.label = "sokol-imgui-indices";
_simgui.ibuf = sg_make_buffer(&ib_desc);

// a default font sampler
sg_sampler_desc font_smp_desc;
_simgui_clear(&font_smp_desc, sizeof(font_smp_desc));
font_smp_desc.wrap_u = SG_WRAP_CLAMP_TO_EDGE;
font_smp_desc.wrap_v = SG_WRAP_CLAMP_TO_EDGE;
font_smp_desc.min_filter = SG_FILTER_LINEAR;
font_smp_desc.mag_filter = SG_FILTER_LINEAR;
font_smp_desc.mipmap_filter = SG_FILTER_NONE;
font_smp_desc.label = "sokol-imgui-font-sampler";
_simgui.font_smp = sg_make_sampler(&font_smp_desc);

// a default user-image sampler
sg_sampler_desc def_sampler_desc;
_simgui_clear(&def_sampler_desc, sizeof(def_sampler_desc));
Expand All @@ -2368,35 +2365,67 @@ SOKOL_API_IMPL void simgui_setup(const simgui_desc_t* desc) {

// default font texture
if (!_simgui.desc.no_default_font) {
unsigned char* font_pixels;
int font_width, font_height;
#if defined(__cplusplus)
io->Fonts->GetTexDataAsRGBA32(&font_pixels, &font_width, &font_height);
#else
int bytes_per_pixel;
ImFontAtlas_GetTexDataAsRGBA32(io->Fonts, &font_pixels, &font_width, &font_height, &bytes_per_pixel);
#endif
sg_image_desc font_img_desc;
_simgui_clear(&font_img_desc, sizeof(font_img_desc));
font_img_desc.width = font_width;
font_img_desc.height = font_height;
font_img_desc.pixel_format = SG_PIXELFORMAT_RGBA8;
font_img_desc.data.subimage[0][0].ptr = font_pixels;
font_img_desc.data.subimage[0][0].size = (size_t)(font_width * font_height) * sizeof(uint32_t);
font_img_desc.label = "sokol-imgui-font-image";
_simgui.font_img = sg_make_image(&font_img_desc);

simgui_image_desc_t img_desc;
_simgui_clear(&img_desc, sizeof(img_desc));
img_desc.image = _simgui.font_img;
img_desc.sampler = _simgui.font_smp;
_simgui.default_font = simgui_make_image(&img_desc);
io->Fonts->TexID = simgui_imtextureid(_simgui.default_font);
simgui_font_tex_desc_t simgui_font_smp_desc;
_simgui_clear(&simgui_font_smp_desc, sizeof(simgui_font_smp_desc));
simgui_create_fonts_texture(&simgui_font_smp_desc);
}

sg_pop_debug_group();
}

SOKOL_API_IMPL void simgui_create_fonts_texture(const simgui_font_tex_desc_t* desc) {
SOKOL_ASSERT(desc);

#if defined(__cplusplus)
ImGuiIO* io = &ImGui::GetIO();
#else
ImGuiIO* io = igGetIO();
#endif

// a default font sampler
sg_sampler_desc font_smp_desc;
_simgui_clear(&font_smp_desc, sizeof(font_smp_desc));
font_smp_desc.wrap_u = SG_WRAP_CLAMP_TO_EDGE;
font_smp_desc.wrap_v = SG_WRAP_CLAMP_TO_EDGE;
font_smp_desc.min_filter = desc->min_filter;
font_smp_desc.mag_filter = desc->mag_filter;
font_smp_desc.mipmap_filter = SG_FILTER_NONE;
font_smp_desc.label = "sokol-imgui-font-sampler";
_simgui.font_smp = sg_make_sampler(&font_smp_desc);

unsigned char* font_pixels;
int font_width, font_height;
#if defined(__cplusplus)
io->Fonts->GetTexDataAsRGBA32(&font_pixels, &font_width, &font_height);
#else
int bytes_per_pixel;
ImFontAtlas_GetTexDataAsRGBA32(io->Fonts, &font_pixels, &font_width, &font_height, &bytes_per_pixel);
#endif
sg_image_desc font_img_desc;
_simgui_clear(&font_img_desc, sizeof(font_img_desc));
font_img_desc.width = font_width;
font_img_desc.height = font_height;
font_img_desc.pixel_format = SG_PIXELFORMAT_RGBA8;
font_img_desc.data.subimage[0][0].ptr = font_pixels;
font_img_desc.data.subimage[0][0].size = (size_t)(font_width * font_height) * sizeof(uint32_t);
font_img_desc.label = "sokol-imgui-font-image";
_simgui.font_img = sg_make_image(&font_img_desc);

simgui_image_desc_t img_desc;
_simgui_clear(&img_desc, sizeof(img_desc));
img_desc.image = _simgui.font_img;
img_desc.sampler = _simgui.font_smp;
_simgui.default_font = simgui_make_image(&img_desc);
io->Fonts->TexID = simgui_imtextureid(_simgui.default_font);
}

SOKOL_API_IMPL void simgui_destroy_fonts_texture(void) {
// NOTE: it's valid to call the destroy funcs with SG_INVALID_ID
sg_destroy_sampler(_simgui.font_smp);
sg_destroy_image(_simgui.font_img);
simgui_destroy_image(_simgui.default_font);
}

SOKOL_API_IMPL void simgui_shutdown(void) {
SOKOL_ASSERT(_SIMGUI_INIT_COOKIE == _simgui.init_cookie);
#if defined(__cplusplus)
Expand Down
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