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clay/renderers/sokol/sokol_clay.h
Nathan Korth db7d588ab8 sokol renderer & examples
2025-04-09 13:15:55 +12:00

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#ifndef SOKOL_CLAY_INCLUDED
#define SOKOL_CLAY_INCLUDED (1)
/*
sokol_clay.h -- drop-in Clay renderer for sokol_gfx.h
Do this:
#define SOKOL_CLAY_IMPL
before you include this file in *one* C file to create the
implementation.
Optionally provide the following configuration define both before including the
the declaration and implementation:
SOKOL_CLAY_NO_SOKOL_APP - don't depend on sokol_app.h (see below for details)
Include the following headers before sokol_clay.h (both before including
the declaration and implementation):
sokol_gl.h
sokol_fontstash.h
sokol_app.h (except SOKOL_CLAY_NO_SOKOL_APP)
clay.h
FEATURE OVERVIEW:
=================
sokol_clay.h implements the rendering and event-handling code for Clay
(https://github.com/nicbarker/clay) on top of sokol_gl.h and (optionally)
sokol_app.h.
Since sokol_fontstash.h already depends on sokol_gl.h, the rendering is
implemented using sokol_gl calls. (TODO: make fontstash optional?)
The sokol_app.h dependency is optional and used for input event handling.
If you only use sokol_gfx.h but not sokol_app.h in your application,
define SOKOL_CLAY_NO_SOKOL_APP before including the implementation
of sokol_clay.h, this will remove any dependency to sokol_app.h, but
you must call sclay_set_layout_dimensions and handle input yourself.
sokol_clay.h is not thread-safe, all calls must be made from the
same thread where sokol_gfx.h is running.
HOWTO:
======
--- To initialize sokol-clay, call sclay_setup(). This can be done
before or after Clay_Initialize.
--- Create an array of sclay_font_t and fill it by calling one of:
sclay_font_t sclay_add_font(const char *filename);
sclay_font_t sclay_add_font_mem(unsigned char *data, int dataLen);
The fontId value in Clay corresponds to indices in this array. After calling
Clay_Initialize but before calling any layout code, do this:
Clay_SetMeasureTextFunction(sclay_measure_text, &fonts);
where `fonts` is the abovementioned array.
--- At the start of a frame, call sclay_new_frame() if you're using sokol_app.h.
If you're not using sokol_app.h, call:
void sclay_set_layout_dimensions(Clay_Dimensions size, float dpi_scale);
at the start of the frame (or just when the window is resized.)
Either way, do some layout, then at the end of the frame call sclay_render:
sg_begin_pass(...)
// other rendering...
sclay_render(renderCommands, &fonts);
// other rendering...
sgl_draw();
sg_end_pass();
sg_commit();
One caveat: sclay_render assumes the default gl view matrix, and handles scaling
automatically. If you've adjusted the view matrix, remember to first call:
sgl_matrix_mode_modelview();
sgl_load_identity();
before calling sclay_render.
--- if you're using sokol_app.h, from inside the sokol_app.h event callback,
call:
void sclay_handle_event(const sapp_event* ev);
Unfortunately Clay does not currently provide feedback on whether a mouse
click was handled or not.
--- finally, on application shutdown, call
sclay_shutdown()
*/
#if !defined(SOKOL_CLAY_NO_SOKOL_APP) && !defined(SOKOL_APP_INCLUDED)
#error "Please include sokol_app.h before sokol_clay.h (or define SOKOL_CLAY_NO_SOKOL_APP)"
#endif
typedef int sclay_font_t;
void sclay_setup();
void sclay_shutdown();
sclay_font_t sclay_add_font(const char *filename);
sclay_font_t sclay_add_font_mem(unsigned char *data, int dataLen);
Clay_Dimensions sclay_measure_text(Clay_StringSlice text, Clay_TextElementConfig *config, void *userData);
#ifndef SOKOL_CLAY_NO_SOKOL_APP
void sclay_new_frame();
void sclay_handle_event(const sapp_event *ev);
#endif /* SOKOL_CLAY_NO_SOKOL_APP */
/* Use this if you don't call sclay_new_frame. `size` is the "virtual" size which
* your layout is relative to (ie. the actual framebuffer size divided by dpi_scale.)
* Set dpi_scale to 1 if you're not using high-dpi support. */
void sclay_set_layout_dimensions(Clay_Dimensions size, float dpi_scale);
void sclay_render(Clay_RenderCommandArray renderCommands, sclay_font_t *fonts);
#endif /* SOKOL_CLAY_INCLUDED */
#ifdef SOKOL_CLAY_IMPL
#define SOKOL_CLAY_IMPL_INCLUDED (1)
#ifndef SOKOL_GL_INCLUDED
#error "Please include sokol_gl.h before sokol_clay.h"
#endif
#ifndef SOKOL_FONTSTASH_INCLUDED
#error "Please include sokol_fontstash.h before sokol_clay.h"
#endif
#ifndef CLAY_HEADER
#error "Please include clay.h before sokol_clay.h"
#endif
typedef struct {
sgl_pipeline pip;
#ifndef SOKOL_CLAY_NO_SOKOL_APP
Clay_Vector2 mouse_pos, scroll;
bool mouse_down;
#endif
Clay_Dimensions size;
float dpi_scale;
FONScontext *fonts;
} _sclay_state_t;
static _sclay_state_t _sclay;
void sclay_setup() {
_sclay.pip = sgl_make_pipeline(&(sg_pipeline_desc){
.colors[0] = {
.blend = {
.enabled = true,
.src_factor_rgb = SG_BLENDFACTOR_SRC_ALPHA,
.dst_factor_rgb = SG_BLENDFACTOR_ONE_MINUS_SRC_ALPHA,
},
}
});
#ifndef SOKOL_CLAY_NO_SOKOL_APP
_sclay.mouse_pos = (Clay_Vector2){0, 0};
_sclay.scroll = (Clay_Vector2){0, 0};
_sclay.mouse_down = false;
#endif
_sclay.size = (Clay_Dimensions){1, 1};
_sclay.dpi_scale = 1;
_sclay.fonts = sfons_create(&(sfons_desc_t){ 0 });
//TODO clay error handler?
}
void sclay_shutdown() {
sgl_destroy_pipeline(_sclay.pip);
sfons_destroy(_sclay.fonts);
}
#ifndef SOKOL_CLAY_NO_SOKOL_APP
void sclay_handle_event(const sapp_event* ev) {
switch(ev->type){
case SAPP_EVENTTYPE_MOUSE_MOVE:
_sclay.mouse_pos.x = ev->mouse_x / _sclay.dpi_scale;
_sclay.mouse_pos.y = ev->mouse_y / _sclay.dpi_scale;
break;
case SAPP_EVENTTYPE_MOUSE_DOWN:
_sclay.mouse_down = true;
break;
case SAPP_EVENTTYPE_MOUSE_UP:
_sclay.mouse_down = false;
break;
case SAPP_EVENTTYPE_MOUSE_SCROLL:
_sclay.scroll.x += ev->scroll_x;
_sclay.scroll.y += ev->scroll_y;
break;
default: break;
}
}
void sclay_new_frame() {
sclay_set_layout_dimensions((Clay_Dimensions){ (float)sapp_width(), (float)sapp_height() },
sapp_dpi_scale());
Clay_SetPointerState(_sclay.mouse_pos, _sclay.mouse_down);
Clay_UpdateScrollContainers(true, _sclay.scroll, sapp_frame_duration());
_sclay.scroll = (Clay_Vector2){0, 0};
}
#endif /* SOKOL_CLAY_NO_SOKOL_APP */
void sclay_set_layout_dimensions(Clay_Dimensions size, float dpi_scale) {
size.width /= dpi_scale;
size.height /= dpi_scale;
_sclay.size = size;
if(_sclay.dpi_scale != dpi_scale){
_sclay.dpi_scale = dpi_scale;
Clay_ResetMeasureTextCache();
}
Clay_SetLayoutDimensions(size);
}
sclay_font_t sclay_add_font(const char *filename) {
//TODO log something if we get FONS_INVALID
return fonsAddFont(_sclay.fonts, "", filename);
}
sclay_font_t sclay_add_font_mem(unsigned char *data, int dataLen) {
//TODO log something if we get FONS_INVALID
return fonsAddFontMem(_sclay.fonts, "", data, dataLen, false);
}
Clay_Dimensions sclay_measure_text(Clay_StringSlice text, Clay_TextElementConfig *config, void *userData) {
sclay_font_t *fonts = (sclay_font_t *)userData;
if(!fonts) return (Clay_Dimensions){ 0 };
fonsSetFont(_sclay.fonts, fonts[config->fontId]);
fonsSetSize(_sclay.fonts, config->fontSize);
fonsSetSpacing(_sclay.fonts, config->letterSpacing);
float ascent, descent, lineh;
fonsVertMetrics(_sclay.fonts, &ascent, &descent, &lineh);
return (Clay_Dimensions) {
.width = fonsTextBounds(_sclay.fonts, 0, 0, text.chars, text.chars + text.length, NULL),
.height = ascent - descent
};
}
static void _draw_rect(float x, float y, float w, float h){
sgl_v2f(x, y);
sgl_v2f(x, y);
sgl_v2f(x+w, y);
sgl_v2f(x, y+h);
sgl_v2f(x+w, y+h);
sgl_v2f(x+w, y+h);
}
static float _SIN[16] = {
0.000000f, 0.104528f, 0.207912f, 0.309017f,
0.406737f, 0.500000f, 0.587785f, 0.669131f,
0.743145f, 0.809017f, 0.866025f, 0.913545f,
0.951057f, 0.978148f, 0.994522f, 1.000000f,
};
/* rx,ry = radius */
static void _draw_corner(float x, float y, float rx, float ry){
x -= rx;
y -= ry;
sgl_v2f(x, y);
for(int i = 0; i < 16; ++i){
sgl_v2f(x, y);
sgl_v2f(x+(rx*_SIN[15-i]), y+(ry*_SIN[i]));
}
sgl_v2f(x+(rx*_SIN[0]), y+(ry*_SIN[15]));
}
/* rx,ry = radius ix,iy = inner radius */
static void _draw_corner_border(float x, float y, float rx, float ry, float ix, float iy){
x -= rx;
y -= ry;
sgl_v2f(x+(ix*_SIN[15]), y+(iy*_SIN[0]));
for(int i = 0; i < 16; ++i){
sgl_v2f(x+(ix*_SIN[15-i]), y+(iy*_SIN[i]));
sgl_v2f(x+(rx*_SIN[15-i]), y+(ry*_SIN[i]));
}
sgl_v2f(x+(rx*_SIN[0]), y+(ry*_SIN[15]));
}
void sclay_render(Clay_RenderCommandArray renderCommands, sclay_font_t *fonts) {
sgl_matrix_mode_modelview();
sgl_translate(-1.0f, 1.0f, 0.0f);
sgl_scale(2.0f/_sclay.size.width, -2.0f/_sclay.size.height, 1.0f);
sgl_disable_texture();
sgl_push_pipeline();
sgl_load_pipeline(_sclay.pip);
for (uint32_t i = 0; i < renderCommands.length; i++) {
Clay_RenderCommand *renderCommand = Clay_RenderCommandArray_Get(&renderCommands, i);
Clay_BoundingBox bbox = renderCommand->boundingBox;
switch (renderCommand->commandType) {
case CLAY_RENDER_COMMAND_TYPE_RECTANGLE: {
Clay_RectangleRenderData *config = &renderCommand->renderData.rectangle;
sgl_c4f(config->backgroundColor.r / 255.0f,
config->backgroundColor.g / 255.0f,
config->backgroundColor.b / 255.0f,
config->backgroundColor.a / 255.0f);
Clay_CornerRadius r = config->cornerRadius;
sgl_begin_triangle_strip();
if(r.topLeft > 0 || r.topRight > 0){
_draw_corner(bbox.x, bbox.y, -r.topLeft, -r.topLeft);
_draw_corner(bbox.x+bbox.width, bbox.y, r.topRight, -r.topRight);
_draw_rect(bbox.x+r.topLeft, bbox.y,
bbox.width-r.topLeft-r.topRight, CLAY__MAX(r.topLeft, r.topRight));
}
if(r.bottomLeft > 0 || r.bottomRight > 0){
_draw_corner(bbox.x, bbox.y+bbox.height, -r.bottomLeft, r.bottomLeft);
_draw_corner(bbox.x+bbox.width, bbox.y+bbox.height, r.bottomRight, r.bottomRight);
_draw_rect(bbox.x+r.bottomLeft,
bbox.y+bbox.height-CLAY__MAX(r.bottomLeft, r.bottomRight),
bbox.width-r.bottomLeft-r.bottomRight, CLAY__MAX(r.bottomLeft, r.bottomRight));
}
if(r.topLeft < r.bottomLeft){
if(r.topLeft < r.topRight){
_draw_rect(bbox.x, bbox.y+r.topLeft, r.topLeft, bbox.height-r.topLeft-r.bottomLeft);
_draw_rect(bbox.x+r.topLeft, bbox.y+r.topRight,
r.bottomLeft-r.topLeft, bbox.height-r.topRight-r.bottomLeft);
} else {
_draw_rect(bbox.x, bbox.y+r.topLeft, r.bottomLeft, bbox.height-r.topLeft-r.bottomLeft);
}
} else {
if(r.bottomLeft < r.bottomRight){
_draw_rect(bbox.x, bbox.y+r.topLeft, r.bottomLeft, bbox.height-r.topLeft-r.bottomLeft);
_draw_rect(bbox.x+r.bottomLeft, bbox.y+r.topLeft,
r.topLeft-r.bottomLeft, bbox.height-r.topLeft-r.bottomRight);
} else {
_draw_rect(bbox.x, bbox.y+r.topLeft, r.topLeft, bbox.height-r.topLeft-r.bottomLeft);
}
}
if(r.topRight < r.bottomRight){
if(r.topRight < r.topLeft){
_draw_rect(bbox.x+bbox.width-r.bottomRight, bbox.y+r.topLeft,
r.bottomRight-r.topRight, bbox.height-r.topLeft-r.bottomRight);
_draw_rect(bbox.x+bbox.width-r.topRight, bbox.y+r.topRight,
r.topRight, bbox.height-r.topRight-r.bottomRight);
} else {
_draw_rect(bbox.x+bbox.width-r.bottomRight, bbox.y+r.topRight,
r.bottomRight, bbox.height-r.topRight-r.bottomRight);
}
} else {
if(r.bottomRight < r.bottomLeft){
_draw_rect(bbox.x+bbox.width-r.topRight, bbox.y+r.topRight,
r.topRight-r.bottomRight, bbox.height-r.topRight-r.bottomLeft);
_draw_rect(bbox.x+bbox.width-r.bottomRight, bbox.y+r.topRight,
r.bottomRight, bbox.height-r.topRight-r.bottomRight);
} else {
_draw_rect(bbox.x+bbox.width-r.topRight, bbox.y+r.topRight,
r.topRight, bbox.height-r.topRight-r.bottomRight);
}
}
_draw_rect(bbox.x+CLAY__MAX(r.topLeft, r.bottomLeft),
bbox.y+CLAY__MAX(r.topLeft, r.topRight),
bbox.width-CLAY__MAX(r.topLeft, r.bottomLeft)-CLAY__MAX(r.topRight, r.bottomRight),
bbox.height-CLAY__MAX(r.topLeft, r.topRight)-CLAY__MAX(r.bottomLeft, r.bottomRight));
sgl_end();
break;
}
case CLAY_RENDER_COMMAND_TYPE_TEXT: {
if(!fonts) break;
Clay_TextRenderData *config = &renderCommand->renderData.text;
Clay_StringSlice text = config->stringContents;
fonsSetFont(_sclay.fonts, fonts[config->fontId]);
uint32_t color = sfons_rgba(
config->textColor.r,
config->textColor.g,
config->textColor.b,
config->textColor.a);
fonsSetColor(_sclay.fonts, color);
fonsSetSpacing(_sclay.fonts, config->letterSpacing * _sclay.dpi_scale);
fonsSetAlign(_sclay.fonts, FONS_ALIGN_LEFT | FONS_ALIGN_TOP);
fonsSetSize(_sclay.fonts, config->fontSize * _sclay.dpi_scale);
sgl_matrix_mode_modelview();
sgl_push_matrix();
sgl_scale(1.0f/_sclay.dpi_scale, 1.0f/_sclay.dpi_scale, 1.0f);
fonsDrawText(_sclay.fonts, bbox.x*_sclay.dpi_scale, bbox.y*_sclay.dpi_scale,
text.chars, text.chars + text.length);
sgl_pop_matrix();
break;
}
case CLAY_RENDER_COMMAND_TYPE_SCISSOR_START: {
sgl_scissor_rectf(bbox.x*_sclay.dpi_scale, bbox.y*_sclay.dpi_scale,
bbox.width*_sclay.dpi_scale, bbox.height*_sclay.dpi_scale,
true);
break;
}
case CLAY_RENDER_COMMAND_TYPE_SCISSOR_END: {
sgl_scissor_rectf(0, 0,
_sclay.size.width*_sclay.dpi_scale, _sclay.size.height*_sclay.dpi_scale,
true);
break;
}
case CLAY_RENDER_COMMAND_TYPE_IMAGE: {
//TODO
break;
}
case CLAY_RENDER_COMMAND_TYPE_BORDER: {
Clay_BorderRenderData *config = &renderCommand->renderData.border;
sgl_c4f(config->color.r / 255.0f,
config->color.g / 255.0f,
config->color.b / 255.0f,
config->color.a / 255.0f);
Clay_BorderWidth w = config->width;
Clay_CornerRadius r = config->cornerRadius;
sgl_begin_triangle_strip();
if(w.left > 0){
_draw_rect(bbox.x, bbox.y + r.topLeft,
w.left, bbox.height - r.topLeft - r.bottomLeft);
}
if(w.right > 0){
_draw_rect(bbox.x + bbox.width - w.right, bbox.y + r.topRight,
w.right, bbox.height - r.topRight - r.bottomRight);
}
if(w.top > 0){
_draw_rect(bbox.x + r.topLeft, bbox.y,
bbox.width - r.topLeft - r.topRight, w.top);
}
if(w.bottom > 0){
_draw_rect(bbox.x + r.bottomLeft, bbox.y + bbox.height - w.bottom,
bbox.width - r.bottomLeft - r.bottomRight, w.bottom);
}
if(r.topLeft > 0 && (w.top > 0 || w.left > 0)){
_draw_corner_border(bbox.x, bbox.y,
-r.topLeft, -r.topLeft,
-r.topLeft+w.left, -r.topLeft+w.top);
}
if(r.topRight > 0 && (w.top > 0 || w.right > 0)){
_draw_corner_border(bbox.x+bbox.width, bbox.y,
r.topRight, -r.topRight,
r.topRight-w.right, -r.topRight+w.top);
}
if(r.bottomLeft > 0 && (w.bottom > 0 || w.left > 0)){
_draw_corner_border(bbox.x, bbox.y+bbox.height,
-r.bottomLeft, r.bottomLeft,
-r.bottomLeft+w.left, r.bottomLeft-w.bottom);
}
if(r.bottomRight > 0 && (w.bottom > 0 || w.right > 0)){
_draw_corner_border(bbox.x+bbox.width, bbox.y+bbox.height,
r.bottomRight, r.bottomRight,
r.bottomRight-w.right, r.bottomRight-w.bottom);
}
sgl_end();
break;
}
default:
break;
}
}
sgl_pop_pipeline();
sfons_flush(_sclay.fonts);
}
#endif /* SOKOL_CLAY_IMPL */
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