Lua colorlib: color library

This commit is contained in:
Lactozilla 2023-08-04 15:10:25 -03:00
parent a54d3a274a
commit 126fba4ddb

View file

@ -13,10 +13,33 @@
#include "doomdef.h"
#include "fastcmp.h"
#include "r_data.h"
#include "v_video.h"
#include "lua_script.h"
#include "lua_libs.h"
#define COLORLIB_USE_LOOKUP
#ifdef COLORLIB_USE_LOOKUP
static colorlookup_t colormix_lut;
#define GetNearestColor(r, g, b) GetColorLUT(&colormix_lut, r, g, b)
#else
#define GetNearestColor(r, g, b) NearestPaletteColor(r, g, b, pMasterPalette)
#endif
////////////////
// Color library
////////////////
static int lib_colorPaletteToRgb(lua_State *L)
{
RGBA_t color = V_GetMasterColor((UINT8)luaL_checkinteger(L, 1));
lua_pushinteger(L, color.s.red);
lua_pushinteger(L, color.s.green);
lua_pushinteger(L, color.s.blue);
return 3;
}
#define IS_HEX_CHAR(x) ((x >= '0' && x <= '9') || (x >= 'a' && x <= 'f') || (x >= 'A' && x <= 'F'))
#define ARE_HEX_CHARS(str, i) IS_HEX_CHAR(str[i]) && IS_HEX_CHAR(str[i + 1])
@ -32,6 +55,13 @@ static UINT32 hex2int(char x)
return 0;
}
static UINT8 GetHTMLColorLength(const char *str)
{
if (str[0] == '#')
str++;
return strlen(str) >= 8 ? 4 : 3;
}
static UINT8 ParseHTMLColor(const char *str, UINT8 *rgba, size_t numc)
{
const char *hex = str;
@ -77,6 +107,348 @@ static UINT8 ParseHTMLColor(const char *str, UINT8 *rgba, size_t numc)
return 0;
}
static UINT8 GetPackedRGBA(UINT32 colors, UINT8 *rgba)
{
if (colors > 0xFFFFFF)
{
rgba[0] = (colors >> 24) & 0xFF;
rgba[1] = (colors >> 16) & 0xFF;
rgba[2] = (colors >> 8) & 0xFF;
rgba[3] = colors & 0xFF;
return 4;
}
else
{
rgba[0] = (colors >> 16) & 0xFF;
rgba[1] = (colors >> 8) & 0xFF;
rgba[2] = colors & 0xFF;
rgba[3] = 0xFF;
return 3;
}
}
static UINT8 GetArgsRGBA(lua_State *L, UINT8 index, INT32 *r, INT32 *g, INT32 *b, INT32 *a)
{
UINT8 rgba[4] = { 0, 0, 0, 255 };
UINT8 num = 0;
if (lua_gettop(L) == 1 && lua_type(L, index) == LUA_TNUMBER)
{
num = GetPackedRGBA(luaL_checkinteger(L, 1), rgba);
*r = rgba[0];
*g = rgba[1];
*b = rgba[2];
if (a)
*a = rgba[3];
}
else if (lua_type(L, index) == LUA_TSTRING)
{
const char *str = lua_tostring(L, index);
UINT8 parsed = ParseHTMLColor(str, rgba, GetHTMLColorLength(str));
if (!parsed)
luaL_error(L, "Malformed HTML color '%s'", str);
num = parsed == 8 ? 4 : 3;
*r = rgba[0];
*g = rgba[1];
*b = rgba[2];
if (a)
*a = rgba[3];
}
else
{
INT32 temp;
#define CHECKINT(i) luaL_checkinteger(L, i)
#define GETCOLOR(c, i, desc) { \
temp = CHECKINT(i); \
if (temp < 0 || temp > 255) \
luaL_error(L, desc " channel %d out of range (0 - 255)", temp); \
c = temp; \
num++; \
}
GETCOLOR(*r, index + 0, "red color");
GETCOLOR(*g, index + 1, "green color");
GETCOLOR(*b, index + 2, "blue color");
#undef CHECKINT
#define CHECKINT(i) luaL_optinteger(L, i, 255)
if (a)
GETCOLOR(*a, index + 3, "alpha");
#undef CHECKINT
#undef GETCOLOR
num = 3 + (lua_type(L, index + 3) == LUA_TNUMBER);
}
return num;
}
static int lib_colorRgbToPalette(lua_State *L)
{
INT32 r, g, b;
GetArgsRGBA(L, 1, &r, &g, &b, NULL);
#ifdef COLORLIB_USE_LOOKUP
InitColorLUT(&colormix_lut, pMasterPalette, false);
#endif
lua_pushinteger(L, GetNearestColor(r, g, b));
return 1;
}
static void GetHSLFromTable(lua_State *L, UINT32 index, UINT8 *hsl)
{
lua_pushnil(L);
while (lua_next(L, index)) {
lua_Integer i = 0;
const char *field = NULL;
if (lua_isnumber(L, -2))
i = lua_tointeger(L, -2);
else
field = luaL_checkstring(L, -2);
#define CHECKFIELD(p, c) (i == p || (field && fastcmp(field, c)))
#define HSLSET(p, c) { \
INT32 val = luaL_checkinteger(L, -1); \
if (val < 0 || val > 255) \
luaL_error(L, c " %d out of range (0 - 255)", val); \
hsl[p] = (UINT8)val; \
}
if (CHECKFIELD(1, "h")) {
HSLSET(0, "hue");
} else if (CHECKFIELD(2, "s")) {
HSLSET(1, "saturation");
} else if (CHECKFIELD(3, "l")) {
HSLSET(2, "lightness");
}
#undef CHECKFIELD
#undef HSLSET
lua_pop(L, 1);
}
}
#define SCALE_UINT8_TO_FIXED(val) FixedDiv(val * FRACUNIT, 255 * FRACUNIT)
#define SCALE_FIXED_TO_UINT8(val) FixedRound(FixedMul(val, 255 * FRACUNIT)) / FRACUNIT
static fixed_t hue2rgb(fixed_t p, fixed_t q, fixed_t t)
{
if (t < 0)
t += FRACUNIT;
if (t > FRACUNIT)
t -= FRACUNIT;
fixed_t out;
if (t < FRACUNIT / 6)
out = p + FixedMul(FixedMul(q - p, 6 * FRACUNIT), t);
else if (t < FRACUNIT / 2)
out = q;
else if (t < 2 * FRACUNIT / 3)
out = p + FixedMul(FixedMul(q - p, 2 * FRACUNIT / 3 - t), 6 * FRACUNIT);
else
out = p;
return out;
}
static int lib_colorHslToRgb(lua_State *L)
{
fixed_t h, s, l;
if (lua_istable(L, 1))
{
UINT8 hsl[3] = { 0, 0, 0 };
GetHSLFromTable(L, 1, hsl);
h = hsl[0];
s = hsl[1];
l = hsl[2];
}
else
{
#define GETHSL(c, i, desc) \
c = luaL_checkinteger(L, i); \
if (c < 0 || c > 255) \
luaL_error(L, desc " %d out of range (0 - 255)", c)
GETHSL(h, 1, "hue");
GETHSL(s, 2, "saturation");
GETHSL(l, 3, "value");
#undef GETHSL
}
if (!s)
{
lua_pushinteger(L, l);
lua_pushinteger(L, l);
lua_pushinteger(L, l);
}
else
{
h = SCALE_UINT8_TO_FIXED(h);
s = SCALE_UINT8_TO_FIXED(s);
l = SCALE_UINT8_TO_FIXED(l);
fixed_t q, p;
if (l < FRACUNIT/2)
q = FixedMul(l, FRACUNIT + s);
else
q = l + s - FixedMul(l, s);
p = l * 2 - q;
lua_pushinteger(L, SCALE_FIXED_TO_UINT8(hue2rgb(p, q, h + FRACUNIT/3)));
lua_pushinteger(L, SCALE_FIXED_TO_UINT8(hue2rgb(p, q, h)));
lua_pushinteger(L, SCALE_FIXED_TO_UINT8(hue2rgb(p, q, h - FRACUNIT/3)));
}
return 3;
}
static int lib_colorRgbToHsl(lua_State *L)
{
INT32 ir, ig, ib;
GetArgsRGBA(L, 1, &ir, &ig, &ib, NULL);
fixed_t r = SCALE_UINT8_TO_FIXED(ir);
fixed_t g = SCALE_UINT8_TO_FIXED(ig);
fixed_t b = SCALE_UINT8_TO_FIXED(ib);
fixed_t cmin = min(min(r, g), b);
fixed_t cmax = max(max(r, g), b);
fixed_t h, s, l = (cmax + cmin) / 2;
fixed_t delta = cmax - cmin;
if (!delta)
h = s = 0;
else
{
if (l > FRACUNIT / 2)
s = FixedDiv(delta, (FRACUNIT * 2) - cmax - cmin);
else
s = FixedDiv(delta, cmax + cmin);
if (r > g && r > b)
{
h = FixedDiv(g - b, delta);
if (g < b)
h += FRACUNIT * 6;
}
else
{
h = FixedDiv(r - g, delta);
if (g > b)
h += FRACUNIT * 2;
else
h += FRACUNIT * 4;
}
h = FixedDiv(h, FRACUNIT * 6);
}
lua_pushinteger(L, SCALE_FIXED_TO_UINT8(h));
lua_pushinteger(L, SCALE_FIXED_TO_UINT8(s));
lua_pushinteger(L, SCALE_FIXED_TO_UINT8(l));
return 3;
}
static int lib_colorHexToRgb(lua_State *L)
{
UINT8 rgba[4] = { 0, 0, 0, 255 };
const char *str = luaL_checkstring(L, 1);
UINT8 parsed = ParseHTMLColor(str, rgba, 4), num = 3;
if (!parsed)
luaL_error(L, "Malformed HTML color '%s'", str);
else if (parsed == 8)
num++;
lua_pushinteger(L, rgba[0]);
lua_pushinteger(L, rgba[1]);
lua_pushinteger(L, rgba[2]);
if (num == 4)
lua_pushinteger(L, rgba[3]);
return num;
}
static int lib_colorRgbToHex(lua_State *L)
{
INT32 r, g, b, a;
UINT8 num = GetArgsRGBA(L, 1, &r, &g, &b, &a);
char buffer[10];
if (num >= 4)
snprintf(buffer, sizeof buffer, "#%02X%02X%02X%02X", r, g, b, a);
else
snprintf(buffer, sizeof buffer, "#%02X%02X%02X", r, g, b);
lua_pushstring(L, buffer);
return 1;
}
static int lib_colorPackRgb(lua_State *L)
{
INT32 r, g, b;
GetArgsRGBA(L, 1, &r, &g, &b, NULL);
UINT32 packed = ((r & 0xFF) << 16) | ((g & 0xFF) << 8) | (b & 0xFF);
lua_pushinteger(L, packed);
return 1;
}
static int lib_colorPackRgba(lua_State *L)
{
INT32 r, g, b, a;
GetArgsRGBA(L, 1, &r, &g, &b, &a);
UINT32 packed = ((r & 0xFF) << 24) | ((g & 0xFF) << 16) | ((b & 0xFF) << 8) | (a & 0xFF);
lua_pushinteger(L, packed);
return 1;
}
static int lib_colorUnpackRgba(lua_State *L)
{
UINT8 rgba[4];
UINT8 num = GetPackedRGBA(lua_tointeger(L, 1), rgba);
for (UINT8 i = 0; i < num; i++)
{
lua_pushinteger(L, rgba[i]);
}
return num;
}
static luaL_Reg color_lib[] = {
{"paletteToRgb", lib_colorPaletteToRgb},
{"rgbToPalette", lib_colorRgbToPalette},
{"hslToRgb", lib_colorHslToRgb},
{"rgbToHsl", lib_colorRgbToHsl},
{"hexToRgb", lib_colorHexToRgb},
{"rgbToHex", lib_colorRgbToHex},
{"packRgb", lib_colorPackRgb},
{"packRgba", lib_colorPackRgba},
{"unpackRgba", lib_colorUnpackRgba},
{NULL, NULL}
};
/////////////////////////
// extracolormap userdata
/////////////////////////
@ -180,21 +552,7 @@ static void GetExtraColormapRGBA(lua_State *L, UINT8 *rgba, int arg)
}
else
{
UINT32 colors = lua_tointeger(L, arg);
if (colors > 0xFFFFFF)
{
rgba[0] = (colors >> 24) & 0xFF;
rgba[1] = (colors >> 16) & 0xFF;
rgba[2] = (colors >> 8) & 0xFF;
rgba[3] = colors & 0xFF;
}
else
{
rgba[0] = (colors >> 16) & 0xFF;
rgba[1] = (colors >> 8) & 0xFF;
rgba[2] = colors & 0xFF;
rgba[3] = 0xFF;
}
GetPackedRGBA(lua_tointeger(L, arg), rgba);
}
}
@ -328,5 +686,7 @@ int LUA_ColorLib(lua_State *L)
lua_setfield(L, -2, "__len");
lua_pop(L, 1);
luaL_register(L, "color", color_lib);
return 0;
}