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v4k-git-backup/engine/split/3rd_lite.h

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// Copyright (c) 2020 rxi
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
// [doc] https://rxi.github.io/lite_an_implementation_overview.html
// [chg] differences from https://github.com/rxi/lite listed below:
//
// a) amalgamated as single-file source.
// b) platform agnostic now (no more specific SDL calls; tested with GLFW backend).
// c) specific `lt_` platform bits have been moved out to an external file (lite_sys.h)
// d) lua, stb-truetype and lite_sys headers *must be included* beforehand.
// e) embeddable: reverted loop handler from framework to library mode. see: lt_init/lt_tick
// f) data folders reorganized as data/themes, data/languages/ and data/plugins/.
// g) DATADIR path can be specified now and no longer forced to be EXEDIR/data/.
// h) packaged with a bunch of handy plugins from https://github.com/rxi/lite-plugins
// i) packaged with all color themes from https://github.com/rxi/lite-colors
// j) merged a few pending PRs and pending fixes from original repo.
// k) Lua sources fixed for Lua >= 5.2
//
// All contributions released under same MIT licensing terms than original code.
// - rlyeh.
#include <assert.h>
#include <ctype.h>
#include <errno.h>
#include <math.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <sys/stat.h>
#ifndef S_ISDIR
#define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
#endif
#ifndef S_ISREG
#define S_ISREG(mode) (((mode) & S_IFMT) == S_IFREG)
#endif
// ----------------------------------------------------------------------------
// lite/api.h
#define API_TYPE_FONT "Font"
// ----------------------------------------------------------------------------
// lite/renderer.h
typedef struct RenImage RenImage;
typedef struct RenFont RenFont;
typedef struct { uint8_t b, g, r, a; } RenColor;
//typedef struct { int x, y, width, height; } RenRect;
typedef lt_rect RenRect;
void ren_init(void *win);
void ren_update_rects(RenRect *rects, int count);
void ren_set_clip_rect(RenRect rect);
void ren_get_size(int *x, int *y);
RenImage* ren_new_image(int width, int height);
void ren_free_image(RenImage *image);
RenFont* ren_load_font(const char *filename, float size);
void ren_free_font(RenFont *font);
void ren_set_font_tab_width(RenFont *font, int n);
int ren_get_font_tab_width(RenFont *font);
int ren_get_font_width(RenFont *font, const char *text);
int ren_get_font_height(RenFont *font);
void ren_draw_rect(RenRect rect, RenColor color);
void ren_draw_image(RenImage *image, RenRect *sub, int x, int y, RenColor color);
int ren_draw_text(RenFont *font, const char *text, int x, int y, RenColor color);
// ----------------------------------------------------------------------------
// lite/rencache.h
void rencache_show_debug(bool enable);
void rencache_free_font(RenFont *font);
void rencache_set_clip_rect(RenRect rect);
void rencache_draw_rect(RenRect rect, RenColor color);
int rencache_draw_text(RenFont *font, const char *text, int x, int y, RenColor color);
void rencache_invalidate(void);
void rencache_begin_frame(void);
void rencache_end_frame(void);
// ----------------------------------------------------------------------------
// lite/renderer.c
#define MAX_GLYPHSET 256
struct RenImage {
RenColor *pixels;
int width, height;
};
typedef struct {
RenImage *image;
stbtt_bakedchar glyphs[256];
} GlyphSet;
struct RenFont {
void *data;
stbtt_fontinfo stbfont;
GlyphSet *sets[MAX_GLYPHSET];
float size;
int height;
};
static struct { int left, top, right, bottom; } lt_clip;
static const char* codepoint_to_utf8_(unsigned c) { //< @r-lyeh
static char s[4+1];
lt_memset(s, 0, 5);
/**/ if (c < 0x80) s[0] = c, s[1] = 0;
else if (c < 0x800) s[0] = 0xC0 | ((c >> 6) & 0x1F), s[1] = 0x80 | ( c & 0x3F), s[2] = 0;
else if (c < 0x10000) s[0] = 0xE0 | ((c >> 12) & 0x0F), s[1] = 0x80 | ((c >> 6) & 0x3F), s[2] = 0x80 | ( c & 0x3F), s[3] = 0;
else if (c < 0x110000) s[0] = 0xF0 | ((c >> 18) & 0x07), s[1] = 0x80 | ((c >> 12) & 0x3F), s[2] = 0x80 | ((c >> 6) & 0x3F), s[3] = 0x80 | (c & 0x3F), s[4] = 0;
return s;
}
static const char* utf8_to_codepoint_(const char *p, unsigned *dst) {
unsigned res, n;
switch (*p & 0xf0) {
case 0xf0 : res = *p & 0x07; n = 3; break;
case 0xe0 : res = *p & 0x0f; n = 2; break;
case 0xd0 :
case 0xc0 : res = *p & 0x1f; n = 1; break;
default : res = *p; n = 0; break;
}
while (n-- && *p++) { //< https://github.com/rxi/lite/issues/262
res = (res << 6) | (*p & 0x3f); //< https://github.com/rxi/lite/issues/262
}
*dst = res;
return p + 1;
}
void ren_init(void *win) {
lt_surface *surf = lt_getsurface(lt_window());
ren_set_clip_rect( (RenRect) { 0, 0, surf->w, surf->h } );
}
void ren_update_rects(RenRect *rects, int count) {
lt_updatesurfacerects(lt_getsurface(lt_window()), (lt_rect*) rects, count);
}
void ren_set_clip_rect(RenRect rect) {
lt_clip.left = rect.x;
lt_clip.top = rect.y;
lt_clip.right = rect.x + rect.width;
lt_clip.bottom = rect.y + rect.height;
}
void ren_get_size(int *x, int *y) {
lt_surface *surf = lt_getsurface(lt_window());
*x = surf->w;
*y = surf->h;
}
RenImage* ren_new_image(int width, int height) {
lt_assert(width > 0 && height > 0);
RenImage *image = lt_malloc(sizeof(RenImage) + width * height * sizeof(RenColor));
image->pixels = (void*) (image + 1);
image->width = width;
image->height = height;
return image;
}
void ren_free_image(RenImage *image) {
lt_free(image);
}
static GlyphSet* load_glyphset(RenFont *font, int idx) {
GlyphSet *set = lt_calloc(1, sizeof(GlyphSet));
/* init image */
int width = 128;
int height = 128;
retry:
set->image = ren_new_image(width, height);
/* load glyphs */
float s =
stbtt_ScaleForMappingEmToPixels(&font->stbfont, 1) /
stbtt_ScaleForPixelHeight(&font->stbfont, 1);
int res = stbtt_BakeFontBitmap(
font->data, 0, font->size * s, (void*) set->image->pixels,
width, height, idx * 256, 256, set->glyphs);
/* retry with a larger image buffer if the buffer wasn't large enough */
if (res < 0) {
width *= 2;
height *= 2;
ren_free_image(set->image);
goto retry;
}
/* adjust glyph yoffsets and xadvance */
int ascent, descent, linegap;
stbtt_GetFontVMetrics(&font->stbfont, &ascent, &descent, &linegap);
float scale = stbtt_ScaleForMappingEmToPixels(&font->stbfont, font->size);
int scaled_ascent = ascent * scale + 0.5;
for (int i = 0; i < 256; i++) {
set->glyphs[i].yoff += scaled_ascent;
set->glyphs[i].xadvance = floor(set->glyphs[i].xadvance);
}
/* convert 8bit data to 32bit */
for (int i = width * height - 1; i >= 0; i--) {
uint8_t n = *((uint8_t*) set->image->pixels + i);
set->image->pixels[i] = (RenColor) { .r = 255, .g = 255, .b = 255, .a = n };
}
return set;
}
static GlyphSet* get_glyphset(RenFont *font, int codepoint) {
int idx = (codepoint >> 8) % MAX_GLYPHSET;
if (!font->sets[idx]) {
font->sets[idx] = load_glyphset(font, idx);
}
return font->sets[idx];
}
RenFont* ren_load_font(const char *filename, float size) {
/* load font into buffer */ //< @r-lyeh: load font file before allocating `font`
char *fontdata = lt_load_file(filename, NULL);
if( !fontdata ) return NULL;
RenFont *font = NULL;
/* init font */
font = lt_calloc(1, sizeof(RenFont));
font->size = size;
font->data = fontdata;
/* init stbfont */
int ok = stbtt_InitFont(&font->stbfont, font->data, 0);
if (!ok) {
if (font) { lt_free(font->data); }
lt_free(font);
return NULL;
}
/* get height and scale */
int ascent, descent, linegap;
stbtt_GetFontVMetrics(&font->stbfont, &ascent, &descent, &linegap);
float scale = stbtt_ScaleForMappingEmToPixels(&font->stbfont, size);
font->height = (ascent - descent + linegap) * scale + 0.5;
/* make tab and newline glyphs invisible */
stbtt_bakedchar *g = get_glyphset(font, '\n')->glyphs;
g['\t'].x1 = g['\t'].x0;
g['\n'].x1 = g['\n'].x0;
return font;
}
void ren_free_font(RenFont *font) {
for (int i = 0; i < MAX_GLYPHSET; i++) {
GlyphSet *set = font->sets[i];
if (set) {
ren_free_image(set->image);
lt_free(set);
}
}
lt_free(font->data);
lt_free(font);
}
void ren_set_font_tab_width(RenFont *font, int n) {
GlyphSet *set = get_glyphset(font, '\t');
set->glyphs['\t'].xadvance = n;
}
int ren_get_font_tab_width(RenFont *font) {
GlyphSet *set = get_glyphset(font, '\t');
return set->glyphs['\t'].xadvance;
}
int ren_get_font_width(RenFont *font, const char *text) {
int x = 0;
const char *p = text;
unsigned codepoint;
while (*p) {
p = utf8_to_codepoint_(p, &codepoint);
GlyphSet *set = get_glyphset(font, codepoint);
stbtt_bakedchar *g = &set->glyphs[codepoint & 0xff];
x += g->xadvance;
}
return x;
}
int ren_get_font_height(RenFont *font) {
return font->height;
}
static inline RenColor blend_pixel(RenColor dst, RenColor src) {
int ia = 0xff - src.a;
dst.r = ((src.r * src.a) + (dst.r * ia)) >> 8;
dst.g = ((src.g * src.a) + (dst.g * ia)) >> 8;
dst.b = ((src.b * src.a) + (dst.b * ia)) >> 8;
return dst;
}
static inline RenColor blend_pixel2(RenColor dst, RenColor src, RenColor color) {
src.a = (src.a * color.a) >> 8;
int ia = 0xff - src.a;
dst.r = ((src.r * color.r * src.a) >> 16) + ((dst.r * ia) >> 8);
dst.g = ((src.g * color.g * src.a) >> 16) + ((dst.g * ia) >> 8);
dst.b = ((src.b * color.b * src.a) >> 16) + ((dst.b * ia) >> 8);
return dst;
}
#define rect_draw_loop(expr) \
for (int j = y1; j < y2; j++) { \
for (int i = x1; i < x2; i++) { \
*d = expr; \
d++; \
} \
d += dr; \
}
void ren_draw_rect(RenRect rect, RenColor color) {
if (color.a == 0) { return; }
int x1 = rect.x < lt_clip.left ? lt_clip.left : rect.x;
int y1 = rect.y < lt_clip.top ? lt_clip.top : rect.y;
int x2 = rect.x + rect.width;
int y2 = rect.y + rect.height;
x2 = x2 > lt_clip.right ? lt_clip.right : x2;
y2 = y2 > lt_clip.bottom ? lt_clip.bottom : y2;
lt_surface *surf = lt_getsurface(lt_window());
RenColor *d = (RenColor*) surf->pixels;
d += x1 + y1 * surf->w;
int dr = surf->w - (x2 - x1);
if (color.a == 0xff) {
rect_draw_loop(color);
} else {
rect_draw_loop(blend_pixel(*d, color));
}
}
void ren_draw_image(RenImage *image, RenRect *sub, int x, int y, RenColor color) {
if (color.a == 0) { return; }
/* clip */
int n;
if ((n = lt_clip.left - x) > 0) { sub->width -= n; sub->x += n; x += n; }
if ((n = lt_clip.top - y) > 0) { sub->height -= n; sub->y += n; y += n; }
if ((n = x + sub->width - lt_clip.right ) > 0) { sub->width -= n; }
if ((n = y + sub->height - lt_clip.bottom) > 0) { sub->height -= n; }
if (sub->width <= 0 || sub->height <= 0) {
return;
}
/* draw */
lt_surface *surf = lt_getsurface(lt_window());
RenColor *s = image->pixels;
RenColor *d = (RenColor*) surf->pixels;
s += sub->x + sub->y * image->width;
d += x + y * surf->w;
int sr = image->width - sub->width;
int dr = surf->w - sub->width;
for (int j = 0; j < sub->height; j++) {
for (int i = 0; i < sub->width; i++) {
*d = blend_pixel2(*d, *s, color);
d++;
s++;
}
d += dr;
s += sr;
}
}
int ren_draw_text(RenFont *font, const char *text, int x, int y, RenColor color) {
RenRect rect;
const char *p = text;
unsigned codepoint;
while (*p) {
p = utf8_to_codepoint_(p, &codepoint);
GlyphSet *set = get_glyphset(font, codepoint);
stbtt_bakedchar *g = &set->glyphs[codepoint & 0xff];
rect.x = g->x0;
rect.y = g->y0;
rect.width = g->x1 - g->x0;
rect.height = g->y1 - g->y0;
ren_draw_image(set->image, &rect, x + g->xoff, y + g->yoff, color);
x += g->xadvance;
}
return x;
}
// ----------------------------------------------------------------------------
// lite/renderer_font.c
static int f_load(lua_State *L) {
const char *filename = luaL_checkstring(L, 1);
float size = luaL_checknumber(L, 2);
RenFont **self = lua_newuserdata(L, sizeof(*self));
luaL_setmetatable(L, API_TYPE_FONT);
*self = ren_load_font(filename, size);
if (!*self) { luaL_error(L, "failed to load font"); }
return 1;
}
static int f_set_tab_width(lua_State *L) {
RenFont **self = luaL_checkudata(L, 1, API_TYPE_FONT);
int n = luaL_checknumber(L, 2);
ren_set_font_tab_width(*self, n);
return 0;
}
static int f_GC(lua_State *L) {
RenFont **self = luaL_checkudata(L, 1, API_TYPE_FONT);
if (*self) { rencache_free_font(*self); }
return 0;
}
static int f_get_width(lua_State *L) {
RenFont **self = luaL_checkudata(L, 1, API_TYPE_FONT);
const char *text = luaL_checkstring(L, 2);
lua_pushnumber(L, ren_get_font_width(*self, text) );
return 1;
}
static int f_get_height(lua_State *L) {
RenFont **self = luaL_checkudata(L, 1, API_TYPE_FONT);
lua_pushnumber(L, ren_get_font_height(*self) );
return 1;
}
int luaopen_renderer_font(lua_State *L) {
static const luaL_Reg lib[] = {
{ "__gc", f_GC },
{ "load", f_load },
{ "set_tab_width", f_set_tab_width },
{ "get_width", f_get_width },
{ "get_height", f_get_height },
{ NULL, NULL }
};
luaL_newmetatable(L, API_TYPE_FONT);
luaL_setfuncs(L, lib, 0);
lua_pushvalue(L, -1);
lua_setfield(L, -2, "__index");
return 1;
}
// ----------------------------------------------------------------------------
// lite/renderer_api.c
static RenColor checkcolor(lua_State *L, int idx, int def) {
RenColor color;
if (lua_isnoneornil(L, idx)) {
return (RenColor) { def, def, def, 255 };
}
lua_rawgeti(L, idx, 1);
lua_rawgeti(L, idx, 2);
lua_rawgeti(L, idx, 3);
lua_rawgeti(L, idx, 4);
color.r = luaL_checknumber(L, -4);
color.g = luaL_checknumber(L, -3);
color.b = luaL_checknumber(L, -2);
color.a = luaL_optnumber(L, -1, 255);
lua_pop(L, 4);
return color;
}
static int f_show_debug(lua_State *L) {
luaL_checkany(L, 1);
rencache_show_debug(lua_toboolean(L, 1));
return 0;
}
static int f_get_size(lua_State *L) {
int w, h;
ren_get_size(&w, &h);
lua_pushnumber(L, w);
lua_pushnumber(L, h);
return 2;
}
static int f_begin_frame(lua_State *L) {
rencache_begin_frame();
return 0;
}
static int f_end_frame(lua_State *L) {
rencache_end_frame();
return 0;
}
static int f_set_clip_rect(lua_State *L) {
RenRect rect;
rect.x = luaL_checknumber(L, 1);
rect.y = luaL_checknumber(L, 2);
rect.width = luaL_checknumber(L, 3);
rect.height = luaL_checknumber(L, 4);
rencache_set_clip_rect(rect);
return 0;
}
static int f_draw_rect(lua_State *L) {
RenRect rect;
rect.x = luaL_checknumber(L, 1);
rect.y = luaL_checknumber(L, 2);
rect.width = luaL_checknumber(L, 3);
rect.height = luaL_checknumber(L, 4);
RenColor color = checkcolor(L, 5, 255);
rencache_draw_rect(rect, color);
return 0;
}
static int f_draw_text(lua_State *L) {
RenFont **font = luaL_checkudata(L, 1, API_TYPE_FONT);
const char *text = luaL_checkstring(L, 2);
int x = luaL_checknumber(L, 3);
int y = luaL_checknumber(L, 4);
RenColor color = checkcolor(L, 5, 255);
x = rencache_draw_text(*font, text, x, y, color);
lua_pushnumber(L, x);
return 1;
}
int luaopen_renderer(lua_State *L) {
static const luaL_Reg lib[] = {
{ "show_debug", f_show_debug },
{ "get_size", f_get_size },
{ "begin_frame", f_begin_frame },
{ "end_frame", f_end_frame },
{ "set_clip_rect", f_set_clip_rect },
{ "draw_rect", f_draw_rect },
{ "draw_text", f_draw_text },
{ NULL, NULL }
};
luaL_newlib(L, lib);
luaopen_renderer_font(L);
lua_setfield(L, -2, "font");
return 1;
}
// ----------------------------------------------------------------------------
// lite/rencache.c
/* a cache over the software renderer -- all drawing operations are stored as
** commands when issued. At the end of the frame we write the commands to a grid
** of hash values, take the cells that have changed since the previous frame,
** merge them into dirty rectangles and redraw only those regions */
#define CELLS_X 80
#define CELLS_Y 50
#define CELL_SIZE 96
#define COMMAND_BUF_SIZE (1024 * 512)
enum { FREE_FONT, SET_CLIP, DRAW_TEXT, DRAW_RECT };
typedef struct {
int type, size;
RenRect rect;
RenColor color;
RenFont *font;
int tab_width;
char text[0];
} Command;
static unsigned cells_buf1[CELLS_X * CELLS_Y];
static unsigned cells_buf2[CELLS_X * CELLS_Y];
static unsigned *cells_prev = cells_buf1;
static unsigned *cells = cells_buf2;
static RenRect rect_buf[CELLS_X * CELLS_Y / 2];
static char command_buf[COMMAND_BUF_SIZE];
static int command_buf_idx;
static RenRect screen_rect;
static bool show_debug;
/* 32bit fnv-1a hash */
#define HASH_INITIAL 2166136261
static void hash(unsigned *h, const void *data, int size) {
const unsigned char *p = data;
while (size--) {
*h = (*h ^ *p++) * 16777619;
}
}
static inline int cell_idx(int x, int y) {
return x + y * CELLS_X;
}
static inline bool rects_overlap(RenRect a, RenRect b) {
return b.x + b.width >= a.x && b.x <= a.x + a.width
&& b.y + b.height >= a.y && b.y <= a.y + a.height;
}
static RenRect intersect_rects(RenRect a, RenRect b) {
int x1 = maxi(a.x, b.x);
int y1 = maxi(a.y, b.y);
int x2 = mini(a.x + a.width, b.x + b.width);
int y2 = mini(a.y + a.height, b.y + b.height);
return (RenRect) { x1, y1, max(0, x2 - x1), max(0, y2 - y1) };
}
static RenRect merge_rects(RenRect a, RenRect b) {
int x1 = mini(a.x, b.x);
int y1 = mini(a.y, b.y);
int x2 = maxi(a.x + a.width, b.x + b.width);
int y2 = maxi(a.y + a.height, b.y + b.height);
return (RenRect) { x1, y1, x2 - x1, y2 - y1 };
}
static Command* push_command(int type, int size) {
size_t alignment = 7; // alignof(max_align_t) - 1; //< C11 https://github.com/rxi/lite/pull/292/commits/ad1bdf56e3f212446e1c61fd45de8b94de5e2bc3
size = (size + alignment) & ~alignment; //< https://github.com/rxi/lite/pull/292/commits/ad1bdf56e3f212446e1c61fd45de8b94de5e2bc3
Command *cmd = (Command*) (command_buf + command_buf_idx);
int n = command_buf_idx + size;
if (n > COMMAND_BUF_SIZE) {
fprintf(stderr, "Warning: (" __FILE__ "): exhausted command buffer\n");
return NULL;
}
command_buf_idx = n;
lt_memset(cmd, 0, sizeof(Command));
cmd->type = type;
cmd->size = size;
return cmd;
}
static bool next_command(Command **prev) {
if (*prev == NULL) {
*prev = (Command*) command_buf;
} else {
*prev = (Command*) (((char*) *prev) + (*prev)->size);
}
return *prev != ((Command*) (command_buf + command_buf_idx));
}
void rencache_show_debug(bool enable) {
show_debug = enable;
}
void rencache_free_font(RenFont *font) {
Command *cmd = push_command(FREE_FONT, sizeof(Command));
if (cmd) { cmd->font = font; }
}
void rencache_set_clip_rect(RenRect rect) {
Command *cmd = push_command(SET_CLIP, sizeof(Command));
if (cmd) { cmd->rect = intersect_rects(rect, screen_rect); }
}
void rencache_draw_rect(RenRect rect, RenColor color) {
if (!rects_overlap(screen_rect, rect)) { return; }
Command *cmd = push_command(DRAW_RECT, sizeof(Command));
if (cmd) {
cmd->rect = rect;
cmd->color = color;
}
}
int rencache_draw_text(RenFont *font, const char *text, int x, int y, RenColor color) {
RenRect rect;
rect.x = x;
rect.y = y;
rect.width = ren_get_font_width(font, text);
rect.height = ren_get_font_height(font);
if (rects_overlap(screen_rect, rect)) {
int sz = strlen(text) + 1;
Command *cmd = push_command(DRAW_TEXT, sizeof(Command) + sz);
if (cmd) {
memcpy(cmd->text, text, sz);
cmd->color = color;
cmd->font = font;
cmd->rect = rect;
cmd->tab_width = ren_get_font_tab_width(font);
}
}
return x + rect.width;
}
void rencache_invalidate(void) {
lt_memset(cells_prev, 0xff, sizeof(cells_buf1));
}
void rencache_begin_frame(void) {
/* reset all cells if the screen width/height has changed */
int w, h;
ren_get_size(&w, &h);
if (screen_rect.width != w || h != screen_rect.height) {
screen_rect.width = w;
screen_rect.height = h;
rencache_invalidate();
}
}
static void update_overlapping_cells(RenRect r, unsigned h) {
int x1 = r.x / CELL_SIZE;
int y1 = r.y / CELL_SIZE;
int x2 = (r.x + r.width) / CELL_SIZE;
int y2 = (r.y + r.height) / CELL_SIZE;
for (int y = y1; y <= y2; y++) {
for (int x = x1; x <= x2; x++) {
int idx = cell_idx(x, y);
hash(&cells[idx], &h, sizeof(h));
}
}
}
static void push_rect(RenRect r, int *count) {
/* try to merge with existing rectangle */
for (int i = *count - 1; i >= 0; i--) {
RenRect *rp = &rect_buf[i];
if (rects_overlap(*rp, r)) {
*rp = merge_rects(*rp, r);
return;
}
}
/* couldn't merge with previous rectangle: push */
rect_buf[(*count)++] = r;
}
void rencache_end_frame(void) {
/* update cells from commands */
Command *cmd = NULL;
RenRect cr = screen_rect;
while (next_command(&cmd)) {
if (cmd->type == SET_CLIP) { cr = cmd->rect; }
RenRect r = intersect_rects(cmd->rect, cr);
if (r.width == 0 || r.height == 0) { continue; }
unsigned h = HASH_INITIAL;
hash(&h, cmd, cmd->size);
update_overlapping_cells(r, h);
}
/* push rects for all cells changed from last frame, reset cells */
int rect_count = 0;
int max_x = screen_rect.width / CELL_SIZE + 1;
int max_y = screen_rect.height / CELL_SIZE + 1;
for (int y = 0; y < max_y; y++) {
for (int x = 0; x < max_x; x++) {
/* compare previous and current cell for change */
int idx = cell_idx(x, y);
if (cells[idx] != cells_prev[idx]) {
push_rect((RenRect) { x, y, 1, 1 }, &rect_count);
}
cells_prev[idx] = HASH_INITIAL;
}
}
/* expand rects from cells to pixels */
for (int i = 0; i < rect_count; i++) {
RenRect *r = &rect_buf[i];
r->x *= CELL_SIZE;
r->y *= CELL_SIZE;
r->width *= CELL_SIZE;
r->height *= CELL_SIZE;
*r = intersect_rects(*r, screen_rect);
}
/* redraw updated regions */
bool has_free_commands = false;
for (int i = 0; i < rect_count; i++) {
/* draw */
RenRect r = rect_buf[i];
ren_set_clip_rect(r);
cmd = NULL;
while (next_command(&cmd)) {
switch (cmd->type) {
case FREE_FONT:
has_free_commands = true;
break;
case SET_CLIP:
ren_set_clip_rect(intersect_rects(cmd->rect, r));
break;
case DRAW_RECT:
ren_draw_rect(cmd->rect, cmd->color);
break;
case DRAW_TEXT:
ren_set_font_tab_width(cmd->font, cmd->tab_width);
ren_draw_text(cmd->font, cmd->text, cmd->rect.x, cmd->rect.y, cmd->color);
break;
}
}
if (show_debug) {
RenColor color = { rand(), rand(), rand(), 50 };
ren_draw_rect(r, color);
}
}
/* update dirty rects */
if (rect_count > 0) {
ren_update_rects(rect_buf, rect_count);
}
/* free fonts */
if (has_free_commands) {
cmd = NULL;
while (next_command(&cmd)) {
if (cmd->type == FREE_FONT) {
ren_free_font(cmd->font);
}
}
}
/* swap cell buffer and reset */
unsigned *tmp = cells;
cells = cells_prev;
cells_prev = tmp;
command_buf_idx = 0;
}
// ----------------------------------------------------------------------------
// lite/system.c
static int f_set_cursor(lua_State *L) {
static const char *cursor_opts[] = {
"arrow",
"ibeam",
"sizeh",
"sizev",
"hand",
NULL
};
int n = luaL_checkoption(L, 1, "arrow", cursor_opts);
lt_setcursor(n);
return 0;
}
static int f_set_window_title(lua_State *L) {
const char *title = luaL_checkstring(L, 1);
lt_setwindowtitle(title);
return 0;
}
static int f_set_window_mode(lua_State *L) {
static const char *window_opts[] = { "normal", "maximized", "fullscreen", 0 };
enum { WIN_NORMAL, WIN_MAXIMIZED, WIN_FULLSCREEN };
int n = luaL_checkoption(L, 1, "normal", window_opts);
lt_setwindowmode(n);
return 0;
}
static int f_window_has_focus(lua_State *L) {
unsigned flags = lt_haswindowfocus();
lua_pushboolean(L, flags);
return 1;
}
static int f_show_confirm_dialog(lua_State *L) {
const char *title = luaL_checkstring(L, 1);
const char *msg = luaL_checkstring(L, 2);
int id = lt_prompt(msg, title); // 0:no, 1:yes
lua_pushboolean(L, !!id);
return 1;
}
static int f_chdir(lua_State *L) {
const char *path = luaL_checkstring(L, 1);
int err = chdir(path);
if (err) { luaL_error(L, "chdir() failed"); }
return 0;
}
static int f_list_dir(lua_State *L) {
const char *path = luaL_checkstring(L, 1);
lua_newtable(L);
lt_globpath(L, path);
return 1;
}
static int f_absolute_path(lua_State *L) {
const char *path = luaL_checkstring(L, 1);
char *res = lt_realpath(path, NULL);
if (!res) { return 0; }
lua_pushstring(L, res);
lt_realpath_free(res);
return 1;
}
static int f_get_file_info(lua_State *L) {
const char *path = luaL_checkstring(L, 1);
struct stat s;
int err = stat(path, &s);
if (err < 0) {
lua_pushnil(L);
lua_pushstring(L, strerror(errno));
return 2;
}
lua_newtable(L);
lua_pushnumber(L, s.st_mtime);
lua_setfield(L, -2, "modified");
lua_pushnumber(L, s.st_size);
lua_setfield(L, -2, "size");
if (S_ISREG(s.st_mode)) {
lua_pushstring(L, "file");
} else if (S_ISDIR(s.st_mode)) {
lua_pushstring(L, "dir");
} else {
lua_pushnil(L);
}
lua_setfield(L, -2, "type");
return 1;
}
static int f_get_clipboard(lua_State *L) {
const char *text = lt_getclipboard(lt_window());
if (!text) { return 0; }
lua_pushstring(L, text);
return 1;
}
static int f_set_clipboard(lua_State *L) {
const char *text = luaL_checkstring(L, 1);
lt_setclipboard(lt_window(), text);
return 0;
}
static int f_get_time(lua_State *L) {
double ss = lt_time_ms() / 1000.0;
lua_pushnumber(L, ss);
return 1;
}
static int f_sleep(lua_State *L) {
double ss = luaL_checknumber(L, 1);
lt_sleep_ms(ss * 1000);
return 0;
}
static int f_exec(lua_State *L) {
size_t len;
const char *cmd = luaL_checklstring(L, 1, &len);
char *buf = lt_malloc(len + 32);
if (!buf) { luaL_error(L, "buffer allocation failed"); }
#if _WIN32
sprintf(buf, "cmd /c \"%s\"", cmd);
WinExec(buf, SW_HIDE);
#else
sprintf(buf, "%s &", cmd);
int res = system(buf);
#endif
lt_free(buf);
return 0;
}
static int f_fuzzy_match(lua_State *L) {
const char *str = luaL_checkstring(L, 1);
const char *ptn = luaL_checkstring(L, 2);
int score = 0;
int run = 0;
while (*str && *ptn) {
while (*str == ' ') { str++; }
while (*ptn == ' ') { ptn++; }
if (tolower(*str) == tolower(*ptn)) {
score += run * 10 - (*str != *ptn);
run++;
ptn++;
} else {
score -= 10;
run = 0;
}
str++;
}
if (*ptn) { return 0; }
lua_pushnumber(L, score - (int) strlen(str));
return 1;
}
static int f_poll_event(lua_State *L) { // init.lua > core.step() wakes on mousemoved || inputtext
int rc = lt_poll_event(L);
return rc;
}
int luaopen_system(lua_State *L) {
static const luaL_Reg lib[] = {
{ "poll_event", f_poll_event },
{ "set_cursor", f_set_cursor },
{ "set_window_title", f_set_window_title },
{ "set_window_mode", f_set_window_mode },
{ "window_has_focus", f_window_has_focus },
{ "show_confirm_dialog", f_show_confirm_dialog },
{ "chdir", f_chdir },
{ "list_dir", f_list_dir },
{ "absolute_path", f_absolute_path },
{ "get_file_info", f_get_file_info },
{ "get_clipboard", f_get_clipboard },
{ "set_clipboard", f_set_clipboard },
{ "get_time", f_get_time },
{ "sleep", f_sleep },
{ "exec", f_exec },
{ "fuzzy_match", f_fuzzy_match },
{ NULL, NULL }
};
luaL_newlib(L, lib);
return 1;
}
// ----------------------------------------------------------------------------
// lite/api/api.c
void api_load_libs(lua_State *L) {
static const luaL_Reg libs[] = {
{ "system", luaopen_system },
{ "renderer", luaopen_renderer },
{ NULL, NULL }
};
for (int i = 0; libs[i].name; i++) {
luaL_requiref(L, libs[i].name, libs[i].func, 1);
}
}
// ----------------------------------------------------------------------------
// lite/main.c
void lt_init(lua_State *L, void *handle, const char *pathdata, int argc, char **argv, float scale, const char *platform, const char *pathexe) {
// setup renderer
ren_init(handle);
// setup lua context
api_load_libs(L);
lua_newtable(L);
for (int i = 0; i < argc; i++) {
lua_pushstring(L, argv[i]);
lua_rawseti(L, -2, i + 1);
}
lua_setglobal(L, "ARGS");
lua_pushstring(L, "1.11");
lua_setglobal(L, "VERSION");
lua_pushstring(L, platform);
lua_setglobal(L, "PLATFORM");
lua_pushnumber(L, scale);
lua_setglobal(L, "SCALE");
lua_pushstring(L, pathdata);
lua_setglobal(L, "DATADIR");
lua_pushstring(L, pathexe);
lua_setglobal(L, "EXEFILE");
// init lite
luaL_dostring(L, "core = {}");
luaL_dostring(L,
"xpcall(function()\n"
" SCALE = tonumber(os.getenv(\"LITE_SCALE\")) or SCALE\n"
" PATHSEP = package.config:sub(1, 1)\n"
" EXEDIR = EXEFILE:match(\"^(.+)[/\\\\].*$\")\n"
" USERDIR = EXEDIR .. 'data/user/'\n"
" package.path = EXEDIR .. '/data/?.lua;' .. package.path\n"
" package.path = EXEDIR .. '/data/?/init.lua;' .. package.path\n"
" core = require('core')\n"
" core.init()\n"
"end, function(err)\n"
" print('Error: ' .. tostring(err))\n"
" print(debug.traceback(nil, 2))\n"
" if core and core.on_error then\n"
" pcall(core.on_error, err)\n"
" end\n"
" os.exit(1)\n"
"end)"
);
}
void lt_tick(struct lua_State *L) {
luaL_dostring(L,
"xpcall(function()\n"
" core.run1()\n"
"end, function(err)\n"
" print('Error: ' .. tostring(err))\n"
" print(debug.traceback(nil, 2))\n"
" if core and core.on_error then\n"
" pcall(core.on_error, err)\n"
" end\n"
" os.exit(1)\n"
"end)"
);
}