models: add md5 support

Has:
 * no hacks for replace md2 with md5 automatically(TODO),
 * no logic for merge anim and mesh content as required by loader(TODO),
 * automaticlly converted md5 to md2 like internal format.

Part of https://github.com/yquake2/yquake2remaster/issues/4

Based on:
 * http://tfc.duke.free.fr/coding/md5-specs-en.html
 * https://github.com/Shpoike/Quakespasm/blob/qsrebase/Quake/gl_model.c (Normals code)

Also looked to:
 * https://github.com/Novum/vkQuake/blob/master/Quake/gl_model.c#L4181
 * https://github.com/fte-team/fteqw/blob/master/engine/common/com_mesh.c
 * 1b42134e11

Makefile

@@ -1042,6 +1042,7 @@ REFGL1_OBJS_ := \
 	src/client/refresh/files/surf.o \
 	src/client/refresh/files/maps.o \
 	src/client/refresh/files/models.o \
+	src/client/refresh/files/models_md5.o \
 	src/client/refresh/files/pcx.o \
 	src/client/refresh/files/stb.o \
 	src/client/refresh/files/wal.o \
@@ -1080,6 +1081,7 @@ REFGL3_OBJS_ := \
 	src/client/refresh/files/surf.o \
 	src/client/refresh/files/maps.o \
 	src/client/refresh/files/models.o \
+	src/client/refresh/files/models_md5.o \
 	src/client/refresh/files/pcx.o \
 	src/client/refresh/files/stb.o \
 	src/client/refresh/files/wal.o \
@@ -1124,6 +1126,7 @@ REFGL4_OBJS_ := \
 	src/client/refresh/files/surf.o \
 	src/client/refresh/files/maps.o \
 	src/client/refresh/files/models.o \
+	src/client/refresh/files/models_md5.o \
 	src/client/refresh/files/pcx.o \
 	src/client/refresh/files/stb.o \
 	src/client/refresh/files/wal.o \
@@ -1170,6 +1173,7 @@ REFSOFT_OBJS_ := \
 	src/client/refresh/files/surf.o \
 	src/client/refresh/files/maps.o \
 	src/client/refresh/files/models.o \
+	src/client/refresh/files/models_md5.o \
 	src/client/refresh/files/pcx.o \
 	src/client/refresh/files/stb.o \
 	src/client/refresh/files/wal.o \
@@ -1215,6 +1219,7 @@ REFVK_OBJS_ := \
 	src/client/refresh/files/surf.o \
 	src/client/refresh/files/maps.o \
 	src/client/refresh/files/models.o \
+	src/client/refresh/files/models_md5.o \
 	src/client/refresh/files/pcx.o \
 	src/client/refresh/files/stb.o \
 	src/client/refresh/files/wal.o \

README.md

@@ -37,18 +37,24 @@ Goals (finished):
   * FM/Heretic 2 model format support,
   * Cinematic videos support in smk, mpeg, ogv format,
   * Use ffmpeg for load any video,
+  * MDL/Quake1 model format support,
+  * Daikatana model/wal/map format support,
+  * MD5 model support,
+  * Add debug progress loading code for maps.
 
 Goals (none of it finished):
   * Single player support,
-  * MD5 model support,
+  * modified ReRelease game code support with removed KEX only related code.
-  * modified ReRelease game code support with removed KEX only related code,
 
 Bonus goals:
-  * MDL/Quake1 model format support,
-  * Daikatana model/wal/map format support,
-  * Load colormap as 24bit color,
   * Use shared model cache in client code insted reimplemnet in each render,
-  * Add debug progress loading code.
+  * Check load soft colormap as 24bit color,
+  * Use separete texture hi-color buffer for ui in soft render,
+  * Convert map surface flag by game type,
+  * Cleanup function declarations in game save code,
+  * Support scalled textures for models and walls in soft render and fix
+
+    lighting with remastered maps.
 
 Not a goal:
   * multiplayer protocol support with KEX engine,

src/client/refresh/files/models.c

@@ -223,6 +223,7 @@ Mod_LoadDKMCmdList(const char *mod_name, dmdx_t *pheader, int *pincmd)
 			break;
 		}
 	}
+
 	memset (poutcmd, 0, (pendcmd - poutcmd) * sizeof(int));
 }
 
@@ -266,6 +267,7 @@ Mod_LoadFrames_DKM2(dmdx_t *pheader, const byte *src, size_t inframesize, vec3_t
 
 		inverts = (byte *)&pinframe->verts;
 		outverts = poutframe->verts;
+
 		/* dkm vert version 2 has unalligned by int size struct */
 		for(j=0; j < pheader->num_xyz; j++)
 		{
@@ -1392,6 +1394,11 @@ Mod_LoadModel(const char *mod_name, const void *buffer, int modfilelen,
 				skins, numskins, type);
 			break;
 
+		case IDMD5HEADER:
+			extradata = Mod_LoadModel_MD5(mod_name, buffer, modfilelen,
+				skins, numskins, type);
+			break;
+
 		case IDSPRITEHEADER:
 			extradata = Mod_LoadSprite_SP2(mod_name, buffer, modfilelen,
 				skins, numskins, type);

src/client/refresh/ref_shared.h

@@ -322,6 +322,8 @@ typedef struct
 
 /* Shared models func */
 typedef struct image_s* (*findimage_t)(const char *name, imagetype_t type);
+extern void *Mod_LoadModel_MD5(const char *mod_name, const void *buffer, int modfilelen,
+	struct image_s ***skins, int *numskins, modtype_t *type);
 extern void *Mod_LoadModel(const char *mod_name, const void *buffer, int modfilelen,
 	vec3_t mins, vec3_t maxs, struct image_s ***skins, int *numskins,
 	findimage_t find_image, loadimage_t load_image, modtype_t *type);

src/common/header/shared.h

@@ -212,7 +212,9 @@ typedef enum
  * ==============================================================
  */
 
+/* Vectors */
 typedef float vec_t;
+typedef vec_t vec2_t[2];
 typedef vec_t vec3_t[3];
 typedef vec_t vec4_t[4];
 typedef vec_t vec5_t[5];