Fix loading multiple animations from .iqm file (#928)

* Fix loading multiple animations from .iqm file

* Fix memory leak in models_animation example

* Added export instructions to the animation example

* use raylib free

* include <stdlib.h> to appease the travis CI gods

* replace tabs with spaces

2 files changed, 105 insertions, 99 deletions

diff --git a/examples/models/models_animation.c b/examples/models/models_animation.c
index 7f38b7f5..5e7c8cf5 100644
--- a/examples/models/models_animation.c
+++ b/examples/models/models_animation.c
@@ -9,8 +9,15 @@
 *
 *   Copyright (c) 2019 Culacant (@culacant) and Ramon Santamaria (@raysan5)
 *
+********************************************************************************************
+*
+* To export a model from blender, make sure it is not posed, the vertices need to be in the 
+* same position as they would be in edit mode.
+* and that the scale of your models is set to 0. Scaling can be done from the export menu.
+*
 ********************************************************************************************/
 
+#include <stdlib.h>
 #include "raylib.h"
 
 int main(void)
@@ -93,6 +100,7 @@ int main(void)
     //--------------------------------------------------------------------------------------
     // Unload model animations data
     for (int i = 0; i < animsCount; i++) UnloadModelAnimation(anims[i]);
+    RL_FREE(anims);
 
     UnloadModel(model);         // Unload model
 
diff --git a/src/models.c b/src/models.c
index ee625906..f848e0ab 100644
--- a/src/models.c
+++ b/src/models.c
@@ -867,9 +867,6 @@ void SetModelMeshMaterial(Model *model, int meshId, int materialId)
 // Load model animations from file
 ModelAnimation *LoadModelAnimations(const char *filename, int *animCount)
 {
-    ModelAnimation *animations = (ModelAnimation *)RL_MALLOC(1*sizeof(ModelAnimation));
-    int count = 1;
-    
     #define IQM_MAGIC       "INTERQUAKEMODEL"   // IQM file magic number
     #define IQM_VERSION     2                   // only IQM version 2 supported
 
@@ -904,8 +901,6 @@ ModelAnimation *LoadModelAnimations(const char *filename, int *animCount)
         unsigned int flags;
     } IQMAnim;
     
-    ModelAnimation animation = { 0 };
-
     FILE *iqmFile;
     IQMHeader iqm;
 
@@ -931,153 +926,156 @@ ModelAnimation *LoadModelAnimations(const char *filename, int *animCount)
         fclose(iqmFile);
     }
 
-    // header
-    if (iqm.num_anims > 1) TraceLog(LOG_WARNING, "More than 1 animation in file, only the first one will be loaded");
-
     // bones
     IQMPose *poses;
     poses = RL_MALLOC(sizeof(IQMPose)*iqm.num_poses);
     fseek(iqmFile, iqm.ofs_poses, SEEK_SET);
     fread(poses, sizeof(IQMPose)*iqm.num_poses, 1, iqmFile);
 
-    animation.boneCount = iqm.num_poses;
-    animation.bones = RL_MALLOC(sizeof(BoneInfo)*iqm.num_poses);
-
-    for (int j = 0; j < iqm.num_poses; j++)
-    {
-        strcpy(animation.bones[j].name, "ANIMJOINTNAME");
-        animation.bones[j].parent = poses[j].parent;
-    }
-
     // animations
-    IQMAnim anim = {0};
+    *animCount = iqm.num_anims;
+    IQMAnim *anim = RL_MALLOC(iqm.num_anims*sizeof(IQMAnim));
     fseek(iqmFile, iqm.ofs_anims, SEEK_SET);
-    fread(&anim, sizeof(IQMAnim), 1, iqmFile);
+    fread(anim, iqm.num_anims*sizeof(IQMAnim), 1, iqmFile);
+    ModelAnimation *animations = RL_MALLOC(iqm.num_anims*sizeof(ModelAnimation));
 
-    animation.frameCount = anim.num_frames;
-    //animation.framerate = anim.framerate;
 
     // frameposes
     unsigned short *framedata = RL_MALLOC(sizeof(unsigned short)*iqm.num_frames*iqm.num_framechannels);
     fseek(iqmFile, iqm.ofs_frames, SEEK_SET);
     fread(framedata, sizeof(unsigned short)*iqm.num_frames*iqm.num_framechannels, 1, iqmFile);
 
-    animation.framePoses = RL_MALLOC(sizeof(Transform*)*anim.num_frames);
-    for (int j = 0; j < anim.num_frames; j++) animation.framePoses[j] = RL_MALLOC(sizeof(Transform)*iqm.num_poses);
+    for(int a=0;a<iqm.num_anims;a++)
+    {
 
-    int dcounter = anim.first_frame*iqm.num_framechannels;
+        animations[a].frameCount = anim[a].num_frames;
+        animations[a].boneCount = iqm.num_poses;
+        animations[a].bones = RL_MALLOC(sizeof(BoneInfo)*iqm.num_poses);
+        animations[a].framePoses = RL_MALLOC(sizeof(Transform*)*anim[a].num_frames);
+        // unused for now
+        //animations[a].framerate = anim.framerate;
 
-    for (int frame = 0; frame < anim.num_frames; frame++)
-    {
-        for (int i = 0; i < iqm.num_poses; i++)
+        for (int j = 0; j < iqm.num_poses; j++)
         {
-            animation.framePoses[frame][i].translation.x = poses[i].channeloffset[0];
+            strcpy(animations[a].bones[j].name, "ANIMJOINTNAME");
+            animations[a].bones[j].parent = poses[j].parent;
+        }
 
-            if (poses[i].mask & 0x01)
-            {
-                animation.framePoses[frame][i].translation.x += framedata[dcounter]*poses[i].channelscale[0];
-                dcounter++;
-            }
+        for (int j = 0; j < anim[a].num_frames; j++) animations[a].framePoses[j] = RL_MALLOC(sizeof(Transform)*iqm.num_poses);
 
-            animation.framePoses[frame][i].translation.y = poses[i].channeloffset[1];
+        int dcounter = anim[a].first_frame*iqm.num_framechannels;
 
-            if (poses[i].mask & 0x02)
+        for (int frame = 0; frame < anim[a].num_frames; frame++)
+        {
+            for (int i = 0; i < iqm.num_poses; i++)
             {
-                animation.framePoses[frame][i].translation.y += framedata[dcounter]*poses[i].channelscale[1];
-                dcounter++;
-            }
+                animations[a].framePoses[frame][i].translation.x = poses[i].channeloffset[0];
 
-            animation.framePoses[frame][i].translation.z = poses[i].channeloffset[2];
+                if (poses[i].mask & 0x01)
+                {
+                    animations[a].framePoses[frame][i].translation.x += framedata[dcounter]*poses[i].channelscale[0];
+                    dcounter++;
+                }
 
-            if (poses[i].mask & 0x04)
-            {
-                animation.framePoses[frame][i].translation.z += framedata[dcounter]*poses[i].channelscale[2];
-                dcounter++;
-            }
+                animations[a].framePoses[frame][i].translation.y = poses[i].channeloffset[1];
 
-            animation.framePoses[frame][i].rotation.x = poses[i].channeloffset[3];
+                if (poses[i].mask & 0x02)
+                {
+                    animations[a].framePoses[frame][i].translation.y += framedata[dcounter]*poses[i].channelscale[1];
+                    dcounter++;
+                }
 
-            if (poses[i].mask & 0x08)
-            {
-                animation.framePoses[frame][i].rotation.x += framedata[dcounter]*poses[i].channelscale[3];
-                dcounter++;
-            }
+                animations[a].framePoses[frame][i].translation.z = poses[i].channeloffset[2];
 
-            animation.framePoses[frame][i].rotation.y = poses[i].channeloffset[4];
+                if (poses[i].mask & 0x04)
+                {
+                    animations[a].framePoses[frame][i].translation.z += framedata[dcounter]*poses[i].channelscale[2];
+                    dcounter++;
+                }
 
-            if (poses[i].mask & 0x10)
-            {
-                animation.framePoses[frame][i].rotation.y += framedata[dcounter]*poses[i].channelscale[4];
-                dcounter++;
-            }
+                animations[a].framePoses[frame][i].rotation.x = poses[i].channeloffset[3];
 
-            animation.framePoses[frame][i].rotation.z = poses[i].channeloffset[5];
+                if (poses[i].mask & 0x08)
+                {
+                    animations[a].framePoses[frame][i].rotation.x += framedata[dcounter]*poses[i].channelscale[3];
+                    dcounter++;
+                }
 
-            if (poses[i].mask & 0x20)
-            {
-                animation.framePoses[frame][i].rotation.z += framedata[dcounter]*poses[i].channelscale[5];
-                dcounter++;
-            }
+                animations[a].framePoses[frame][i].rotation.y = poses[i].channeloffset[4];
 
-            animation.framePoses[frame][i].rotation.w = poses[i].channeloffset[6];
+                if (poses[i].mask & 0x10)
+                {
+                    animations[a].framePoses[frame][i].rotation.y += framedata[dcounter]*poses[i].channelscale[4];
+                    dcounter++;
+                }
 
-            if (poses[i].mask & 0x40)
-            {
-                animation.framePoses[frame][i].rotation.w += framedata[dcounter]*poses[i].channelscale[6];
-                dcounter++;
-            }
+                animations[a].framePoses[frame][i].rotation.z = poses[i].channeloffset[5];
 
-            animation.framePoses[frame][i].scale.x = poses[i].channeloffset[7];
+                if (poses[i].mask & 0x20)
+                {
+                    animations[a].framePoses[frame][i].rotation.z += framedata[dcounter]*poses[i].channelscale[5];
+                    dcounter++;
+                }
 
-            if (poses[i].mask & 0x80)
-            {
-                animation.framePoses[frame][i].scale.x += framedata[dcounter]*poses[i].channelscale[7];
-                dcounter++;
-            }
+                animations[a].framePoses[frame][i].rotation.w = poses[i].channeloffset[6];
 
-            animation.framePoses[frame][i].scale.y = poses[i].channeloffset[8];
+                if (poses[i].mask & 0x40)
+                {
+                    animations[a].framePoses[frame][i].rotation.w += framedata[dcounter]*poses[i].channelscale[6];
+                    dcounter++;
+                }
 
-            if (poses[i].mask & 0x100)
-            {
-                animation.framePoses[frame][i].scale.y += framedata[dcounter]*poses[i].channelscale[8];
-                dcounter++;
-            }
+                animations[a].framePoses[frame][i].scale.x = poses[i].channeloffset[7];
 
-            animation.framePoses[frame][i].scale.z = poses[i].channeloffset[9];
+                if (poses[i].mask & 0x80)
+                {
+                    animations[a].framePoses[frame][i].scale.x += framedata[dcounter]*poses[i].channelscale[7];
+                    dcounter++;
+                }
 
-            if (poses[i].mask & 0x200)
-            {
-                animation.framePoses[frame][i].scale.z += framedata[dcounter]*poses[i].channelscale[9];
-                dcounter++;
-            }
+                animations[a].framePoses[frame][i].scale.y = poses[i].channeloffset[8];
+
+                if (poses[i].mask & 0x100)
+                {
+                    animations[a].framePoses[frame][i].scale.y += framedata[dcounter]*poses[i].channelscale[8];
+                    dcounter++;
+                }
+
+                animations[a].framePoses[frame][i].scale.z = poses[i].channeloffset[9];
+
+                if (poses[i].mask & 0x200)
+                {
+                    animations[a].framePoses[frame][i].scale.z += framedata[dcounter]*poses[i].channelscale[9];
+                    dcounter++;
+                }
 
-            animation.framePoses[frame][i].rotation = QuaternionNormalize(animation.framePoses[frame][i].rotation);
+                animations[a].framePoses[frame][i].rotation = QuaternionNormalize(animations[a].framePoses[frame][i].rotation);
+            }
         }
-    }
 
-    // Build frameposes
-    for (int frame = 0; frame < anim.num_frames; frame++)
-    {
-        for (int i = 0; i < animation.boneCount; i++)
+        // Build frameposes
+        for (int frame = 0; frame < anim[a].num_frames; frame++)
         {
-            if (animation.bones[i].parent >= 0)
+            for (int i = 0; i < animations[a].boneCount; i++)
             {
-                animation.framePoses[frame][i].rotation = QuaternionMultiply(animation.framePoses[frame][animation.bones[i].parent].rotation, animation.framePoses[frame][i].rotation);
-                animation.framePoses[frame][i].translation = Vector3RotateByQuaternion(animation.framePoses[frame][i].translation, animation.framePoses[frame][animation.bones[i].parent].rotation);
-                animation.framePoses[frame][i].translation = Vector3Add(animation.framePoses[frame][i].translation, animation.framePoses[frame][animation.bones[i].parent].translation);
-                animation.framePoses[frame][i].scale = Vector3MultiplyV(animation.framePoses[frame][i].scale, animation.framePoses[frame][animation.bones[i].parent].scale);
+                if (animations[a].bones[i].parent >= 0)
+                {
+                    animations[a].framePoses[frame][i].rotation = QuaternionMultiply(animations[a].framePoses[frame][animations[a].bones[i].parent].rotation, animations[a].framePoses[frame][i].rotation);
+                    animations[a].framePoses[frame][i].translation = Vector3RotateByQuaternion(animations[a].framePoses[frame][i].translation, animations[a].framePoses[frame][animations[a].bones[i].parent].rotation);
+                    animations[a].framePoses[frame][i].translation = Vector3Add(animations[a].framePoses[frame][i].translation, animations[a].framePoses[frame][animations[a].bones[i].parent].translation);
+                    animations[a].framePoses[frame][i].scale = Vector3MultiplyV(animations[a].framePoses[frame][i].scale, animations[a].framePoses[frame][animations[a].bones[i].parent].scale);
+                }
             }
         }
     }
 
     RL_FREE(framedata);
     RL_FREE(poses);
+    RL_FREE(anim);
     
     fclose(iqmFile);
 
-    animations[0] = animation;
     
-    *animCount = count;
     return animations;
 }