Interpolation flag support

src/hardware/hw_md2.c

@@ -833,10 +833,14 @@ static void HWR_GetBlendedTexture(GLPatch_t *gpatch, GLPatch_t *blendgpatch, INT
 	run?
 	*/
 
-static boolean HWR_CanInterpolateModel(mobj_t *mobj)
+static boolean HWR_CanInterpolateModel(mobj_t *mobj, model_t *model)
 {
-	return (!(mobj->state->nextstate == S_PLAY_WAIT && mobj->state == &states[S_PLAY_STND] && !(mobj->sprite2 & FF_SPR2SUPER)))
-	&& (mobj->state != &states[S_PLAY_ROLL]);
+	return model->interpolate[(mobj->frame & FF_FRAMEMASK)];
+}
+
+static boolean HWR_CanInterpolateSprite2(modelspr2frames_t *spr2frame)
+{
+	return spr2frame->interpolate;
 }
 
 void HWR_DrawMD2(gr_vissprite_t *spr)
@@ -1027,7 +1031,7 @@ void HWR_DrawMD2(gr_vissprite_t *spr)
 		{
 			if (spr->mobj->sprite2 && md2->model->spr2frames)
 			{
-				if (HWR_CanInterpolateModel(spr->mobj))
+				if (HWR_CanInterpolateSprite2(&md2->model->spr2frames[spr2]))
 				{
 					UINT32 framecount = (&((skin_t *)spr->mobj->skin)->sprites[spr->mobj->sprite2])->numframes;
 					nextFrame = (spr->mobj->frame & FF_FRAMEMASK) + 1;
@@ -1039,7 +1043,7 @@ void HWR_DrawMD2(gr_vissprite_t *spr)
 						nextFrame = md2->model->spr2frames[spr2].frames[nextFrame];
 				}
 			}
-			else
+			else if (HWR_CanInterpolateModel(spr->mobj, md2->model))
 			{
 				// frames are handled differently for states with FF_ANIMATE, so get the next frame differently for the interpolation
 				if (spr->mobj->frame & FF_ANIMATE)

src/hardware/hw_model.c

@@ -199,6 +199,8 @@ model_t *LoadModel(const char *filename, int ztag)
 	Optimize(model);
 	GeneratePolygonNormals(model, ztag);
 	LoadModelSprite2(model);
+	if (!model->spr2frames)
+		LoadModelInterpolationSettings(model);
 
 	// Default material properties
 	for (i = 0 ; i < model->numMaterials; i++)
@@ -224,12 +226,59 @@ model_t *LoadModel(const char *filename, int ztag)
 
 void HWR_ReloadModels(void)
 {
+	size_t i;
 	INT32 s;
+
 	for (s = 0; s < MAXSKINS; s++)
 	{
 		if (md2_playermodels[s].model)
 			LoadModelSprite2(md2_playermodels[s].model);
 	}
+
+	for (i = 0; i < NUMSPRITES; i++)
+	{
+		if (md2_models[i].model)
+			LoadModelInterpolationSettings(md2_models[i].model);
+	}
+}
+
+void LoadModelInterpolationSettings(model_t *model)
+{
+	INT32 i;
+	INT32 numframes = model->meshes[0].numFrames;
+	char *framename = model->framenames;
+
+	if (!framename)
+		return;
+
+	#define GET_OFFSET \
+		memcpy(&interpolation_flag, framename + offset, 2); \
+		model->interpolate[i] = (!memcmp(interpolation_flag, MODEL_INTERPOLATION_FLAG, 2));
+
+	for (i = 0; i < numframes; i++)
+	{
+		int offset = (strlen(framename) - 4);
+		char interpolation_flag[3];
+		memset(&interpolation_flag, 0x00, 3);
+
+		// find the +i on the frame name
+		// ANIM+i00
+		// so the offset is (frame name length - 4)
+		GET_OFFSET;
+
+		// maybe the frame had three digits?
+		// ANIM+i000
+		// so the offset is (frame name length - 5)
+		if (!model->interpolate[i])
+		{
+			offset--;
+			GET_OFFSET;
+		}
+
+		framename += 16;
+	}
+
+	#undef GET_OFFSET
 }
 
 void LoadModelSprite2(model_t *model)
@@ -246,12 +295,15 @@ void LoadModelSprite2(model_t *model)
 	{
 		char prefix[6];
 		char name[5];
+		char interpolation_flag[3];
 		char framechar[4];
 		UINT8 frame = 0;
 		UINT8 spr2idx;
+		boolean interpolate = false;
 
 		memset(&prefix, 0x00, 6);
 		memset(&name, 0x00, 5);
+		memset(&interpolation_flag, 0x00, 3);
 		memset(&framechar, 0x00, 4);
 
 		if (strlen(framename) >= 9)
@@ -261,6 +313,13 @@ void LoadModelSprite2(model_t *model)
 			modelframename += 5;
 			memcpy(&name, modelframename, 4);
 			modelframename += 4;
+			// Oh look
+			memcpy(&interpolation_flag, modelframename, 2);
+			if (!memcmp(interpolation_flag, MODEL_INTERPOLATION_FLAG, 2))
+			{
+				interpolate = true;
+				modelframename += 2;
+			}
 			memcpy(&framechar, modelframename, 3);
 			frame = atoi(framechar);
 
@@ -277,6 +336,7 @@ void LoadModelSprite2(model_t *model)
 							spr2frames[spr2idx].superframes[frame] = i;
 						else
 							spr2frames[spr2idx].frames[frame] = i;
+						spr2frames[spr2idx].interpolate = interpolate;
 						break;
 					}
 					spr2idx++;

src/hardware/hw_model.h

@@ -73,10 +73,13 @@ typedef struct tag_s
 //	matrix_t transform;
 } tag_t;
 
+#define MODEL_INTERPOLATION_FLAG "+i"
+
 typedef struct
 {
 	INT32 frames[256];
 	INT32 superframes[256];
+	boolean interpolate;
 } modelspr2frames_t;
 
 typedef struct model_s
@@ -93,8 +96,9 @@ typedef struct model_s
 	char *mdlFilename;
 	boolean unloaded;
 
-	modelspr2frames_t *spr2frames;
 	char *framenames;
+	boolean interpolate[256];
+	modelspr2frames_t *spr2frames;
 } model_t;
 
 extern int numModels;
@@ -106,6 +110,7 @@ tag_t *GetTagByName(model_t *model, char *name, int frame);
 model_t *LoadModel(const char *filename, int ztag);
 void UnloadModel(model_t *model);
 void Optimize(model_t *model);
+void LoadModelInterpolationSettings(model_t *model);
 void LoadModelSprite2(model_t *model);
 void GenerateVertexNormals(model_t *model);
 void GeneratePolygonNormals(model_t *model, int ztag);