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Diffstat (limited to 'src/portalcolours.c')
| -rw-r--r-- | src/portalcolours.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/src/portalcolours.c b/src/portalcolours.c new file mode 100644 index 0000000..6030bb8 --- /dev/null +++ b/src/portalcolours.c @@ -0,0 +1,147 @@ +/* + * Copyright © 2022 Michael Smith <mikesmiffy128@gmail.com> + * + * Permission to use, copy, modify, and/or distribute this software for any + * purpose with or without fee is hereby granted, provided that the above + * copyright notice and this permission notice appear in all copies. + * + * THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH + * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY + * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, + * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM + * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR + * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR + * PERFORMANCE OF THIS SOFTWARE. + */ + +#include <stdbool.h> +#include <string.h> + +#include "con_.h" +#include "engineapi.h" +#include "extmalloc.h" +#include "gametype.h" +#include "hook.h" +#include "intdefs.h" +#include "mem.h" +#include "os.h" +#include "ppmagic.h" +#include "vcall.h" + +// It's like the thing Portal Tools does, but at runtime! + +DEF_CVAR(sst_portal_colour0, "Crosshair colour for gravity beam (hex)", + "F2CAA7", CON_ARCHIVE | CON_HIDDEN) +DEF_CVAR(sst_portal_colour1, "Crosshair colour for left portal (hex)", + "40A0FF", CON_ARCHIVE | CON_HIDDEN) +DEF_CVAR(sst_portal_colour2, "Crosshair colour for right portal (hex)", + "FFA020", CON_ARCHIVE | CON_HIDDEN) +// XXX: bit weird that this is still con_colour. should we move it back out to +// engineapi as a general colour struct?? +static struct con_colour colours[3] = { + {242, 202, 167, 255}, {64, 160, 255, 255}, {255, 160, 32, 255}}; + +static void hexparse(uchar out[static 4], const char *s) { + const char *p = s; + for (uchar *q = out; q - out < 3; ++q) { + if (*p >= '0' && *p <= '9') { + *q = *p++ - '0' << 4; + } + else if ((*p | 32) >= 'a' && (*p | 32) <= 'f') { + *q = 10 + (*p++ | 32) - 'a' << 4; + } + else { + // screw it, just fall back on white, I guess. + // note: this also handles *p == '\0' so we don't overrun the string + memset(out, 255, 4); // write 4 rather than 3, prolly faster? + return; + } + // repetitive unrolled nonsense + if (*p >= '0' && *p <= '9') { + *q |= *p++ - '0'; + } + else if ((*p | 32) >= 'a' && (*p | 32) <= 'f') { + *q |= 10 + (*p++ | 32) - 'a'; + } + else { + memset(out, 255, 4); + return; + } + } + //out[3] = 255; // never changes! +} + +static void colourcb(struct con_var *v) { + // this is stupid and ugly and has no friends, too bad! + if (v == sst_portal_colour0) { + hexparse(colours[0].bytes, con_getvarstr(v)); + } + else if (v == sst_portal_colour1) { + hexparse(colours[1].bytes, con_getvarstr(v)); + } + else /* sst_portal_colour2 */ { + hexparse(colours[2].bytes, con_getvarstr(v)); + } +} + +// Original sig is the following but we wanna avoid calling convention weirdness +//typedef struct con_colour (*UTIL_Portal_Color_func)(int); +typedef void (*UTIL_Portal_Color_func)(struct con_colour *out, int portal); +static UTIL_Portal_Color_func orig_UTIL_Portal_Color; +static void hook_UTIL_Portal_Color(struct con_colour *out, int portal) { + if (portal < 0 || portal > 2) *out = (struct con_colour){255, 255, 255, 255}; + else *out = colours[portal]; +} + +// TODO(compat): would like to do the usual pointer-chasing business instead of +// using hardcoded offsets, but that's pretty hard here. Would probably have to +// do the entprops stuff for ClientClass, get at the portalgun factory, get a +// vtable, find ViewModelDrawn or something, chase through another 4 or 5 call +// offsets to find something that calls UTIL_Portal_Color... that or dig through +// vgui/hud entries, find the crosshair drawing... +// +// For now we do this! + +static bool find_UTIL_Portal_Color(void *base) { + static const uchar x[] = HEXBYTES(8B, 44, 24, 08, 83, E8, 00, 74, 37, 83, + E8, 01, B1, FF, 74, 1E, 83, E8, 01, 8B, 44, 24, 04, 88); + // 5135 + orig_UTIL_Portal_Color = (UTIL_Portal_Color_func)mem_offset(base, 0x1BF090); + if (!memcmp((void *)orig_UTIL_Portal_Color, x, sizeof(x))) return true; + // 3420 + orig_UTIL_Portal_Color = (UTIL_Portal_Color_func)mem_offset(base, 0x1AA810); + if (!memcmp((void *)orig_UTIL_Portal_Color, x, sizeof(x))) return true; + return false; +} + +bool portalcolours_init(void *clientlib) { // ... should libs be globals? + if (!GAMETYPE_MATCHES(Portal)) return false; +#ifdef _WIN32 + if (!find_UTIL_Portal_Color(clientlib)) { + con_warn("portalcolours: error: couldn't find UTIL_Portal_Color\n"); + return false; + } + orig_UTIL_Portal_Color = (UTIL_Portal_Color_func)hook_inline( + (void *)orig_UTIL_Portal_Color, (void *)&hook_UTIL_Portal_Color); + if (!orig_UTIL_Portal_Color) { + con_warn("portalcolours: error: couldn't hook UTIL_Portal_Color\n"); + return false; + } + sst_portal_colour0->base.flags &= ~CON_HIDDEN; + sst_portal_colour0->cb = &colourcb; + sst_portal_colour1->base.flags &= ~CON_HIDDEN; + sst_portal_colour1->cb = &colourcb; + sst_portal_colour2->base.flags &= ~CON_HIDDEN; + sst_portal_colour2->cb = &colourcb; + return true; +#else +#warning TODO(linux): yet more stuff! + return false; +#endif +} + +void portalcolours_end(void) { + unhook_inline((void *)orig_UTIL_Portal_Color); +} + +// vi: sw=4 ts=4 noet tw=80 cc=80 |