From 2186d5f3f95cd74a070a490d899291648d58667a Mon Sep 17 00:00:00 2001
From: Steven Fuller <relnev@icculus.org>
Date: Sun, 1 Jul 2001 00:55:22 +0000
Subject: Initial revision

---
 src/morph.c | 322 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 322 insertions(+)
 create mode 100644 src/morph.c

(limited to 'src/morph.c')

diff --git a/src/morph.c b/src/morph.c
new file mode 100644
index 0000000..d868a50
--- /dev/null
+++ b/src/morph.c
@@ -0,0 +1,322 @@
+#include "3dc.h"
+
+#include "inline.h"
+
+
+/*
+ externs for commonly used global variables and arrays
+*/
+
+	extern MORPHDISPLAY MorphDisplay;
+	extern int NormalFrameTime;
+
+
+/*
+
+ Global Variables
+
+*/
+
+
+
+
+
+/*
+
+ Update Morphing Animation Control Block
+
+*/
+
+void UpdateMorphing(MORPHCTRL *mcptr)
+
+{
+
+	MORPHHEADER *mhdr = mcptr->ObMorphHeader;
+	int UpdateRate;
+
+
+	/*textprint("UpdateMorphing\n");*/
+
+
+	if(mcptr->ObMorphFlags & mph_flag_play) {
+
+		/* How fast? */
+
+		if(mcptr->ObMorphSpeed == ONE_FIXED) {
+
+			UpdateRate = NormalFrameTime;
+
+		}
+
+		else {
+
+			UpdateRate = MUL_FIXED(NormalFrameTime, mcptr->ObMorphSpeed);
+
+		}
+
+
+		/* Update the current frame */
+
+		if(mcptr->ObMorphFlags & mph_flag_reverse) {
+
+			mcptr->ObMorphCurrFrame -= UpdateRate;
+
+			if(mcptr->ObMorphCurrFrame < 0) {
+
+				if(mcptr->ObMorphFlags & mph_flag_noloop) {
+
+					mcptr->ObMorphCurrFrame = 0;
+
+					/* The sequence has finished and we are at the start */
+
+					mcptr->ObMorphFlags |= (mph_flag_finished | mph_flag_start);
+
+				}
+
+				else {
+
+					mcptr->ObMorphCurrFrame += mhdr->mph_maxframes;
+
+					/* The sequence has looped and we are back at the end */
+
+					mcptr->ObMorphFlags |= (mph_flag_looped | mph_flag_end);
+
+				}
+
+			}
+
+		}
+
+		else {
+
+			mcptr->ObMorphCurrFrame += UpdateRate;
+
+			if(mcptr->ObMorphCurrFrame >= mhdr->mph_maxframes) {
+
+				if(mcptr->ObMorphFlags & mph_flag_noloop) {
+
+					/* The sequence has finished and we are at the end */
+
+					mcptr->ObMorphFlags |= (mph_flag_finished | mph_flag_end);
+
+					mcptr->ObMorphCurrFrame = mhdr->mph_maxframes - 1;
+
+				}
+
+				else {
+
+					mcptr->ObMorphCurrFrame -= mhdr->mph_maxframes;
+
+					/* The sequence has looped and we are back at the start */
+
+					mcptr->ObMorphFlags |= (mph_flag_looped | mph_flag_start);
+
+				}
+
+			}
+
+		}
+
+	}
+
+}
+
+
+
+/*
+
+ Update the Morphing Animation for this object
+
+*/
+
+void UpdateMorphingDptr(DISPLAYBLOCK *dptr)
+
+{
+
+	SHAPEHEADER *sptr1;
+	SHAPEHEADER *sptr2;
+
+
+	/* Update object radius and extents */
+
+	GetMorphDisplay(&MorphDisplay, dptr);
+
+	sptr1 = MorphDisplay.md_sptr1;
+	sptr2 = MorphDisplay.md_sptr2;
+
+	#if 0
+	textprint("sptr1->shaperadius = %d\n", sptr1->shaperadius);
+	textprint("sptr2->shaperadius = %d\n", sptr2->shaperadius);
+	#endif
+
+
+	/* Radius */
+
+	if(sptr1->shaperadius == sptr2->shaperadius) {
+
+		dptr->ObRadius = sptr1->shaperadius;
+
+	}
+
+	else {
+
+		dptr->ObRadius = WideMul2NarrowDiv(sptr1->shaperadius,
+													MorphDisplay.md_one_minus_lerp,
+													sptr2->shaperadius,
+													MorphDisplay.md_lerp, ONE_FIXED);
+
+	}
+
+
+	/* X Extent */
+
+	if(sptr1->shapemaxx == sptr2->shapemaxx) {
+
+		dptr->ObMaxX = sptr1->shapemaxx;
+
+	}
+
+	else {
+
+		dptr->ObMaxX = WideMul2NarrowDiv(sptr1->shapemaxx,
+													MorphDisplay.md_one_minus_lerp,
+													sptr2->shapemaxx,
+													MorphDisplay.md_lerp, ONE_FIXED);
+
+	}
+
+	if(sptr1->shapeminx == sptr2->shapeminx) {
+
+		dptr->ObMinX = sptr1->shapeminx;
+
+	}
+
+	else {
+
+		dptr->ObMinX = WideMul2NarrowDiv(sptr1->shapeminx,
+													MorphDisplay.md_one_minus_lerp,
+													sptr2->shapeminx,
+													MorphDisplay.md_lerp, ONE_FIXED);
+
+	}
+
+
+	/* Y Extent */
+
+	if(sptr1->shapemaxy == sptr2->shapemaxy) {
+
+		dptr->ObMaxY = sptr1->shapemaxy;
+
+	}
+
+	else {
+
+		dptr->ObMaxY = WideMul2NarrowDiv(sptr1->shapemaxy,
+													MorphDisplay.md_one_minus_lerp,
+													sptr2->shapemaxy,
+													MorphDisplay.md_lerp, ONE_FIXED);
+
+	}
+
+	if(sptr1->shapeminy == sptr2->shapeminy) {
+
+		dptr->ObMinY = sptr1->shapeminy;
+
+	}
+
+	else {
+
+		dptr->ObMinY = WideMul2NarrowDiv(sptr1->shapeminy,
+													MorphDisplay.md_one_minus_lerp,
+													sptr2->shapeminy,
+													MorphDisplay.md_lerp, ONE_FIXED);
+
+	}
+
+
+	/* Z Extent */
+
+ 	if(sptr1->shapemaxz == sptr2->shapemaxz) {
+
+		dptr->ObMaxZ = sptr1->shapemaxz;
+
+	}
+
+	else {
+
+		dptr->ObMaxZ = WideMul2NarrowDiv(sptr1->shapemaxz,
+													MorphDisplay.md_one_minus_lerp,
+													sptr2->shapemaxz,
+													MorphDisplay.md_lerp, ONE_FIXED);
+
+	}
+
+	if(sptr1->shapeminz == sptr2->shapeminz) {
+
+		dptr->ObMinZ = sptr1->shapeminz;
+
+	}
+
+	else {
+
+		dptr->ObMinZ = WideMul2NarrowDiv(sptr1->shapeminz,
+													MorphDisplay.md_one_minus_lerp,
+													sptr2->shapeminz,
+													MorphDisplay.md_lerp, ONE_FIXED);
+
+	}
+
+	#if 0
+	textprint("dptr->ObRadius = %d\n", dptr->ObRadius);
+	#endif
+
+}
+
+
+
+/*
+
+ Using the current frame, calculate the lerp values and find out which two
+ shapes to interpolate between.
+
+ Write this information back to a MORPHDISPLAY structure.
+
+*/
+
+void GetMorphDisplay(MORPHDISPLAY *md, DISPLAYBLOCK *dptr)
+
+{
+
+	MORPHFRAME *mdata;
+	MORPHCTRL *mc = dptr->ObMorphCtrl;
+	MORPHHEADER *mhdr = mc->ObMorphHeader;
+
+
+	md->md_lerp = mc->ObMorphCurrFrame & 0xffff;
+	md->md_one_minus_lerp = ONE_FIXED - md->md_lerp;
+
+	mdata = mhdr->mph_frames;
+	mdata = &mdata[mc->ObMorphCurrFrame >> 16];
+
+	md->md_shape1 = mdata->mf_shape1;
+	md->md_shape2 = mdata->mf_shape2;
+
+	md->md_sptr1 = GetShapeData(md->md_shape1);
+	md->md_sptr2 = GetShapeData(md->md_shape2);
+
+}
+
+
+void CopyMorphCtrl(MORPHCTRL *src, MORPHCTRL *dst)
+
+{
+
+	dst->ObMorphCurrFrame = src->ObMorphCurrFrame;
+	dst->ObMorphFlags     = src->ObMorphFlags;
+	dst->ObMorphSpeed     = src->ObMorphSpeed;
+	dst->ObMorphHeader    = src->ObMorphHeader;
+
+}
+
+
+ 
\ No newline at end of file
-- 
cgit v1.3