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frustum.c
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/*
* KJL 15:13:43 7/17/97 - frustrum.c
*
* Contains all the functions connected
* to the view frustrum and clipping
*
*/
#include "3dc.h"
#include "module.h"
#include "inline.h"
#include "stratdef.h"
#include "gamedef.h"
#include "kshape.h"
#include "kzsort.h"
#include "frustum.h"
#include "particle.h"
#define UseLocalAssert Yes
#include "ourasert.h"
/*KJL****************************************************************************************
* G L O B A L S *
****************************************************************************************KJL*/
extern VECTORCH RotatedPts[];
extern DISPLAYBLOCK *Global_ODB_Ptr;
extern SHAPEHEADER *Global_ShapeHeaderPtr;
extern int *Global_ShapePoints;
extern int *Global_ShapeNormals;
extern VECTORCH LocalView;
#define FAR_Z_CLIP 0
#define FAR_Z_CLIP_RANGE 49000
/*KJL****************************************************************************************
* P R O T O T Y P E S *
****************************************************************************************KJL*/
/* GOURAUD POLYGON CLIPPING */
void (*GouraudPolygon_ClipWithNegativeX)(void);
void (*GouraudPolygon_ClipWithPositiveY)(void);
void (*GouraudPolygon_ClipWithNegativeY)(void);
void (*GouraudPolygon_ClipWithPositiveX)(void);
/* TEXTURED POLYGON CLIPPING */
void (*TexturedPolygon_ClipWithNegativeX)(void);
void (*TexturedPolygon_ClipWithPositiveY)(void);
void (*TexturedPolygon_ClipWithNegativeY)(void);
void (*TexturedPolygon_ClipWithPositiveX)(void);
/* GOURAUD TEXTURED POLYGON CLIPPING */
void (*GouraudTexturedPolygon_ClipWithNegativeX)(void);
void (*GouraudTexturedPolygon_ClipWithPositiveY)(void);
void (*GouraudTexturedPolygon_ClipWithNegativeY)(void);
void (*GouraudTexturedPolygon_ClipWithPositiveX)(void);
/* FRUSTRUM TESTS */
int (*ObjectWithinFrustrum)(DISPLAYBLOCK *dbPtr);
int (*ObjectCompletelyWithinFrustrum)(DISPLAYBLOCK *dbPtr);
int (*VertexWithinFrustrum)(RENDERVERTEX *vertexPtr);
void (*TestVerticesWithFrustrum)(void);
static void GouraudPolygon_Norm_ClipWithNegativeX(void);
static void GouraudPolygon_Wide_ClipWithNegativeX(void);
static void GouraudPolygon_Norm_ClipWithPositiveY(void);
static void GouraudPolygon_Wide_ClipWithPositiveY(void);
static void GouraudPolygon_Norm_ClipWithNegativeY(void);
static void GouraudPolygon_Wide_ClipWithNegativeY(void);
static void GouraudPolygon_Norm_ClipWithPositiveX(void);
static void GouraudPolygon_Wide_ClipWithPositiveX(void);
static void TexturedPolygon_Norm_ClipWithNegativeX(void);
static void TexturedPolygon_Wide_ClipWithNegativeX(void);
static void TexturedPolygon_Norm_ClipWithPositiveY(void);
static void TexturedPolygon_Wide_ClipWithPositiveY(void);
static void TexturedPolygon_Norm_ClipWithNegativeY(void);
static void TexturedPolygon_Wide_ClipWithNegativeY(void);
static void TexturedPolygon_Norm_ClipWithPositiveX(void);
static void TexturedPolygon_Wide_ClipWithPositiveX(void);
static void GouraudTexturedPolygon_Norm_ClipWithNegativeX(void);
static void GouraudTexturedPolygon_Wide_ClipWithNegativeX(void);
static void GouraudTexturedPolygon_Norm_ClipWithPositiveY(void);
static void GouraudTexturedPolygon_Wide_ClipWithPositiveY(void);
static void GouraudTexturedPolygon_Norm_ClipWithNegativeY(void);
static void GouraudTexturedPolygon_Wide_ClipWithNegativeY(void);
static void GouraudTexturedPolygon_Norm_ClipWithPositiveX(void);
static void GouraudTexturedPolygon_Wide_ClipWithPositiveX(void);
static int VertexWithin_Norm_Frustrum(RENDERVERTEX *vertexPtr);
static int VertexWithin_Wide_Frustrum(RENDERVERTEX *vertexPtr);
static int ObjectWithin_Norm_Frustrum(DISPLAYBLOCK *dbPtr);
static int ObjectWithin_Wide_Frustrum(DISPLAYBLOCK *dbPtr);
static int ObjectCompletelyWithin_Norm_Frustrum(DISPLAYBLOCK *dbPtr);
static int ObjectCompletelyWithin_Wide_Frustrum(DISPLAYBLOCK *dbPtr);
static void TestVerticesWith_Norm_Frustrum(void);
static void TestVerticesWith_Wide_Frustrum(void);
/*KJL****************************************************************************************
* F U N C T I O N S *
****************************************************************************************KJL*/
void SetFrustrumType(enum FrustrumType frustrumType)
{
switch (frustrumType)
{
default:
case FRUSTRUM_TYPE_NORMAL:
{
/* GOURAUD POLYGON CLIPPING */
GouraudPolygon_ClipWithNegativeX = GouraudPolygon_Norm_ClipWithNegativeX;
GouraudPolygon_ClipWithPositiveY = GouraudPolygon_Norm_ClipWithPositiveY;
GouraudPolygon_ClipWithNegativeY = GouraudPolygon_Norm_ClipWithNegativeY;
GouraudPolygon_ClipWithPositiveX = GouraudPolygon_Norm_ClipWithPositiveX;
/* TEXTURED POLYGON CLIPPING */
TexturedPolygon_ClipWithNegativeX = TexturedPolygon_Norm_ClipWithNegativeX;
TexturedPolygon_ClipWithPositiveY = TexturedPolygon_Norm_ClipWithPositiveY;
TexturedPolygon_ClipWithNegativeY = TexturedPolygon_Norm_ClipWithNegativeY;
TexturedPolygon_ClipWithPositiveX = TexturedPolygon_Norm_ClipWithPositiveX;
/* GOURAUD TEXTURED POLYGON CLIPPING */
GouraudTexturedPolygon_ClipWithNegativeX = GouraudTexturedPolygon_Norm_ClipWithNegativeX;
GouraudTexturedPolygon_ClipWithPositiveY = GouraudTexturedPolygon_Norm_ClipWithPositiveY;
GouraudTexturedPolygon_ClipWithNegativeY = GouraudTexturedPolygon_Norm_ClipWithNegativeY;
GouraudTexturedPolygon_ClipWithPositiveX = GouraudTexturedPolygon_Norm_ClipWithPositiveX;
/* FRUSTRUM TESTS */
TestVerticesWithFrustrum = TestVerticesWith_Norm_Frustrum;
ObjectWithinFrustrum = ObjectWithin_Norm_Frustrum;
ObjectCompletelyWithinFrustrum = ObjectCompletelyWithin_Norm_Frustrum;
VertexWithinFrustrum = VertexWithin_Norm_Frustrum;
break;
}
case FRUSTRUM_TYPE_WIDE:
{
/* GOURAUD POLYGON CLIPPING */
GouraudPolygon_ClipWithNegativeX = GouraudPolygon_Wide_ClipWithNegativeX;
GouraudPolygon_ClipWithPositiveY = GouraudPolygon_Wide_ClipWithPositiveY;
GouraudPolygon_ClipWithNegativeY = GouraudPolygon_Wide_ClipWithNegativeY;
GouraudPolygon_ClipWithPositiveX = GouraudPolygon_Wide_ClipWithPositiveX;
/* TEXTURED POLYGON CLIPPING */
TexturedPolygon_ClipWithNegativeX = TexturedPolygon_Wide_ClipWithNegativeX;
TexturedPolygon_ClipWithPositiveY = TexturedPolygon_Wide_ClipWithPositiveY;
TexturedPolygon_ClipWithNegativeY = TexturedPolygon_Wide_ClipWithNegativeY;
TexturedPolygon_ClipWithPositiveX = TexturedPolygon_Wide_ClipWithPositiveX;
/* GOURAUD TEXTURED POLYGON CLIPPING */
GouraudTexturedPolygon_ClipWithNegativeX = GouraudTexturedPolygon_Wide_ClipWithNegativeX;
GouraudTexturedPolygon_ClipWithPositiveY = GouraudTexturedPolygon_Wide_ClipWithPositiveY;
GouraudTexturedPolygon_ClipWithNegativeY = GouraudTexturedPolygon_Wide_ClipWithNegativeY;
GouraudTexturedPolygon_ClipWithPositiveX = GouraudTexturedPolygon_Wide_ClipWithPositiveX;
/* FRUSTRUM TESTS */
TestVerticesWithFrustrum = TestVerticesWith_Wide_Frustrum;
ObjectWithinFrustrum = ObjectWithin_Wide_Frustrum;
ObjectCompletelyWithinFrustrum = ObjectCompletelyWithin_Wide_Frustrum;
VertexWithinFrustrum = VertexWithin_Wide_Frustrum;
break;
}
}
}
/* clipping code macros - these are used as building blocks to assemble
clipping fns for different polygon types with the minimum of fuss */
#define ZCLIPPINGVALUE 4
//64
#define Clip_Z_Test(v) (ZCLIPPINGVALUE <= (v)->Z)
#define Clip_NX_Test(v) (-(v)->X <= (v)->Z)
#define Clip_PX_Test(v) ((v)->X <= (v)->Z)
#define Clip_NY_Test(v) (-(v)->Y <= (v)->Z)
#define Clip_PY_Test(v) ((v)->Y <= (v)->Z)
#define Clip_LoopStart(b) \
do \
{ \
RENDERVERTEX *nextVertexPtr; \
int nextVertexInside; \
\
/* setup pointer to next vertex, wrapping round if necessary */ \
if (!--verticesLeft) \
{ \
nextVertexPtr = (b); \
} \
else \
{ \
nextVertexPtr = curVertexPtr+1; \
} \
\
/* if current vertex is inside the plane, output it */ \
if (curVertexInside) \
{ \
numberOfPointsOutputted++; \
*outputVerticesPtr++ = *curVertexPtr; \
} \
\
/* test if next vertex is inside the plane */ \
nextVertexInside =
#define Clip_Z_OutputXYZ \
/* if one is in, and the other is out, output a clipped vertex */ \
if (nextVertexInside != curVertexInside) \
{ \
int lambda; \
\
lambda = DIV_FIXED \
( \
(ZCLIPPINGVALUE - curVertexPtr->Z), \
(nextVertexPtr->Z - curVertexPtr->Z) \
); \
\
outputVerticesPtr->X = curVertexPtr->X + MUL_FIXED(lambda,nextVertexPtr->X-curVertexPtr->X); \
outputVerticesPtr->Y = curVertexPtr->Y + MUL_FIXED(lambda,nextVertexPtr->Y-curVertexPtr->Y); \
outputVerticesPtr->Z = ZCLIPPINGVALUE;
#define Clip_NX_OutputXYZ \
/* if one is in, and the other is out, output a clipped vertex */ \
if (nextVertexInside != curVertexInside) \
{ \
int lambda; \
\
lambda = DIV_FIXED \
( \
(curVertexPtr->Z + curVertexPtr->X), \
-(nextVertexPtr->X-curVertexPtr->X) - (nextVertexPtr->Z-curVertexPtr->Z) \
); \
\
outputVerticesPtr->X = curVertexPtr->X + MUL_FIXED(lambda,nextVertexPtr->X-curVertexPtr->X); \
outputVerticesPtr->Z = -outputVerticesPtr->X; \
outputVerticesPtr->Y = curVertexPtr->Y + MUL_FIXED(lambda,nextVertexPtr->Y-curVertexPtr->Y);
#define Clip_PX_OutputXYZ \
/* if one is in, and the other is out, output a clipped vertex */ \
if (nextVertexInside != curVertexInside) \
{ \
int lambda; \
\
lambda = DIV_FIXED \
( \
(curVertexPtr->Z - curVertexPtr->X), \
(nextVertexPtr->X-curVertexPtr->X) - (nextVertexPtr->Z-curVertexPtr->Z) \
); \
\
outputVerticesPtr->X = curVertexPtr->X + MUL_FIXED(lambda,nextVertexPtr->X-curVertexPtr->X); \
outputVerticesPtr->Z = outputVerticesPtr->X; \
outputVerticesPtr->Y = curVertexPtr->Y + MUL_FIXED(lambda,nextVertexPtr->Y-curVertexPtr->Y);
#define Clip_NY_OutputXYZ \
/* if one is in, and the other is out, output a clipped vertex */ \
if (nextVertexInside != curVertexInside) \
{ \
int lambda; \
\
lambda = DIV_FIXED \
( \
(curVertexPtr->Z + curVertexPtr->Y), \
-(nextVertexPtr->Y-curVertexPtr->Y) - (nextVertexPtr->Z-curVertexPtr->Z) \
); \
\
outputVerticesPtr->Z = curVertexPtr->Z + MUL_FIXED(lambda,nextVertexPtr->Z-curVertexPtr->Z); \
outputVerticesPtr->Y = -(outputVerticesPtr->Z); \
outputVerticesPtr->X = curVertexPtr->X + MUL_FIXED(lambda,nextVertexPtr->X-curVertexPtr->X);
#define Clip_PY_OutputXYZ \
/* if one is in, and the other is out, output a clipped vertex */ \
if (nextVertexInside != curVertexInside) \
{ \
int lambda; \
\
lambda = DIV_FIXED \
( \
(curVertexPtr->Z - curVertexPtr->Y), \
(nextVertexPtr->Y-curVertexPtr->Y) - (nextVertexPtr->Z-curVertexPtr->Z) \
); \
\
outputVerticesPtr->Z = curVertexPtr->Z + MUL_FIXED(lambda,nextVertexPtr->Z-curVertexPtr->Z); \
outputVerticesPtr->Y = (outputVerticesPtr->Z); \
outputVerticesPtr->X = curVertexPtr->X + MUL_FIXED(lambda,nextVertexPtr->X-curVertexPtr->X);
#define Clip_OutputUV \
outputVerticesPtr->U = curVertexPtr->U + MUL_FIXED(lambda,nextVertexPtr->U-curVertexPtr->U); \
outputVerticesPtr->V = curVertexPtr->V + MUL_FIXED(lambda,nextVertexPtr->V-curVertexPtr->V);
#define Clip_OutputI \
outputVerticesPtr->A = curVertexPtr->A + MUL_FIXED(lambda,nextVertexPtr->A-curVertexPtr->A); \
outputVerticesPtr->R = curVertexPtr->R + MUL_FIXED(lambda,nextVertexPtr->R-curVertexPtr->R); \
outputVerticesPtr->G = curVertexPtr->G + MUL_FIXED(lambda,nextVertexPtr->G-curVertexPtr->G); \
outputVerticesPtr->B = curVertexPtr->B + MUL_FIXED(lambda,nextVertexPtr->B-curVertexPtr->B); \
outputVerticesPtr->SpecularR = curVertexPtr->SpecularR + MUL_FIXED(lambda,nextVertexPtr->SpecularR-curVertexPtr->SpecularR); \
outputVerticesPtr->SpecularG = curVertexPtr->SpecularG + MUL_FIXED(lambda,nextVertexPtr->SpecularG-curVertexPtr->SpecularG); \
outputVerticesPtr->SpecularB = curVertexPtr->SpecularB + MUL_FIXED(lambda,nextVertexPtr->SpecularB-curVertexPtr->SpecularB);
#define Clip_LoopEnd(b) \
numberOfPointsOutputted++; \
outputVerticesPtr++; \
} \
\
/* okay, now the current vertex becomes what was the next vertex */ \
curVertexPtr = nextVertexPtr; \
curVertexInside = nextVertexInside; \
} \
while(verticesLeft); \
\
RenderPolygon.NumberOfVertices = numberOfPointsOutputted;
/* Wide screen versions of clip macros */
#define Clip_Wide_NX_Test(v) (-(v)->X <= (v)->Z*2)
#define Clip_Wide_PX_Test(v) ((v)->X <= (v)->Z*2)
#define Clip_Wide_NY_Test(v) (-(v)->Y <= (v)->Z*2)
#define Clip_Wide_PY_Test(v) ((v)->Y <= (v)->Z*2)
#define Clip_Wide_NX_OutputXYZ \
/* if one is in, and the other is out, output a clipped vertex */ \
if (nextVertexInside != curVertexInside) \
{ \
int lambda; \
\
lambda = DIV_FIXED \
( \
(-2*curVertexPtr->Z - curVertexPtr->X), \
(nextVertexPtr->X-curVertexPtr->X) - (-2)*(nextVertexPtr->Z-curVertexPtr->Z) \
); \
\
outputVerticesPtr->X = curVertexPtr->X + MUL_FIXED(lambda,nextVertexPtr->X-curVertexPtr->X); \
outputVerticesPtr->Z = -outputVerticesPtr->X/2; \
outputVerticesPtr->Y = curVertexPtr->Y + MUL_FIXED(lambda,nextVertexPtr->Y-curVertexPtr->Y);
#define Clip_Wide_PX_OutputXYZ \
/* if one is in, and the other is out, output a clipped vertex */ \
if (nextVertexInside != curVertexInside) \
{ \
int lambda; \
\
lambda = DIV_FIXED \
( \
(2*curVertexPtr->Z - curVertexPtr->X), \
(nextVertexPtr->X-curVertexPtr->X) - 2*(nextVertexPtr->Z-curVertexPtr->Z) \
); \
\
outputVerticesPtr->X = curVertexPtr->X + MUL_FIXED(lambda,nextVertexPtr->X-curVertexPtr->X); \
outputVerticesPtr->Z = outputVerticesPtr->X/2; \
outputVerticesPtr->Y = curVertexPtr->Y + MUL_FIXED(lambda,nextVertexPtr->Y-curVertexPtr->Y);
#define Clip_Wide_NY_OutputXYZ \
/* if one is in, and the other is out, output a clipped vertex */ \
if (nextVertexInside != curVertexInside) \
{ \
int lambda; \
\
lambda = DIV_FIXED \
( \
(2*curVertexPtr->Z + curVertexPtr->Y), \
-(nextVertexPtr->Y-curVertexPtr->Y) - 2*(nextVertexPtr->Z-curVertexPtr->Z) \
); \
\
outputVerticesPtr->Z = curVertexPtr->Z + MUL_FIXED(lambda,nextVertexPtr->Z-curVertexPtr->Z); \
outputVerticesPtr->Y = -(outputVerticesPtr->Z*2); \
outputVerticesPtr->X = curVertexPtr->X + MUL_FIXED(lambda,nextVertexPtr->X-curVertexPtr->X);
#define Clip_Wide_PY_OutputXYZ \
/* if one is in, and the other is out, output a clipped vertex */ \
if (nextVertexInside != curVertexInside) \
{ \
int lambda; \
\
lambda = DIV_FIXED \
( \
(2*curVertexPtr->Z - curVertexPtr->Y), \
(nextVertexPtr->Y-curVertexPtr->Y) - 2*(nextVertexPtr->Z-curVertexPtr->Z) \
); \
\
outputVerticesPtr->Z = curVertexPtr->Z + MUL_FIXED(lambda,nextVertexPtr->Z-curVertexPtr->Z); \
outputVerticesPtr->Y = (outputVerticesPtr->Z*2); \
outputVerticesPtr->X = curVertexPtr->X + MUL_FIXED(lambda,nextVertexPtr->X-curVertexPtr->X);
/*KJL**************
* GOURAUD POLYGON *
**************KJL*/
/* Clip against Z plane */
void GouraudPolygon_ClipWithZ(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Z_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_Z_Test(nextVertexPtr);
Clip_Z_OutputXYZ
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
/* Clip against negative X plane */
static void GouraudPolygon_Norm_ClipWithNegativeX(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_NX_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_NX_Test(nextVertexPtr);
Clip_NX_OutputXYZ
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
static void GouraudPolygon_Wide_ClipWithNegativeX(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_NX_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_Wide_NX_Test(nextVertexPtr);
Clip_Wide_NX_OutputXYZ
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
/* Clip against positive Y plane*/
static void GouraudPolygon_Norm_ClipWithPositiveY(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_PY_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_PY_Test(nextVertexPtr);
Clip_PY_OutputXYZ
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
static void GouraudPolygon_Wide_ClipWithPositiveY(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_PY_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_Wide_PY_Test(nextVertexPtr);
Clip_Wide_PY_OutputXYZ
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
/* Clip against negative Y plane*/
static void GouraudPolygon_Norm_ClipWithNegativeY(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_NY_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_NY_Test(nextVertexPtr);
Clip_NY_OutputXYZ
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
static void GouraudPolygon_Wide_ClipWithNegativeY(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_NY_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_Wide_NY_Test(nextVertexPtr);
Clip_Wide_NY_OutputXYZ
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
/* Clip against positive X plane */
static void GouraudPolygon_Norm_ClipWithPositiveX(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_PX_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_PX_Test(nextVertexPtr);
Clip_PX_OutputXYZ
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
static void GouraudPolygon_Wide_ClipWithPositiveX(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_PX_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_Wide_PX_Test(nextVertexPtr);
Clip_Wide_PX_OutputXYZ
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
/*KJL***************
* TEXTURED POLYGON *
***************KJL*/
/* Clip against Z plane */
void TexturedPolygon_ClipWithZ(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Z_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_Z_Test(nextVertexPtr);
Clip_Z_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
/* Clip against negative X plane */
static void TexturedPolygon_Norm_ClipWithNegativeX(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_NX_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_NX_Test(nextVertexPtr);
Clip_NX_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
static void TexturedPolygon_Wide_ClipWithNegativeX(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_NX_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_Wide_NX_Test(nextVertexPtr);
Clip_Wide_NX_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
/* Clip against positive Y plane*/
static void TexturedPolygon_Norm_ClipWithPositiveY(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_PY_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_PY_Test(nextVertexPtr);
Clip_PY_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
static void TexturedPolygon_Wide_ClipWithPositiveY(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_PY_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_Wide_PY_Test(nextVertexPtr);
Clip_Wide_PY_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
/* Clip against negative Y plane*/
static void TexturedPolygon_Norm_ClipWithNegativeY(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_NY_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_NY_Test(nextVertexPtr);
Clip_NY_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
static void TexturedPolygon_Wide_ClipWithNegativeY(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_NY_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_Wide_NY_Test(nextVertexPtr);
Clip_Wide_NY_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
/* Clip against positive X plane */
static void TexturedPolygon_Norm_ClipWithPositiveX(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_PX_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_PX_Test(nextVertexPtr);
Clip_PX_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
static void TexturedPolygon_Wide_ClipWithPositiveX(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_PX_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_Wide_PX_Test(nextVertexPtr);
Clip_Wide_PX_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
/*KJL************************
* GOURAUD TEXTURED POLYGONS *
************************KJL*/
/* Clip against Z plane */
void GouraudTexturedPolygon_ClipWithZ(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Z_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_Z_Test(nextVertexPtr);
Clip_Z_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
/* Clip against negative X plane */
static void GouraudTexturedPolygon_Norm_ClipWithNegativeX(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_NX_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_NX_Test(nextVertexPtr);
Clip_NX_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
static void GouraudTexturedPolygon_Wide_ClipWithNegativeX(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_NX_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_Wide_NX_Test(nextVertexPtr);
Clip_Wide_NX_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
/* Clip against positive Y plane*/
static void GouraudTexturedPolygon_Norm_ClipWithPositiveY(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_PY_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_PY_Test(nextVertexPtr);
Clip_PY_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
static void GouraudTexturedPolygon_Wide_ClipWithPositiveY(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_PY_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_Wide_PY_Test(nextVertexPtr);
Clip_Wide_PY_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
/* Clip against negative Y plane*/
static void GouraudTexturedPolygon_Norm_ClipWithNegativeY(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_NY_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_NY_Test(nextVertexPtr);
Clip_NY_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
static void GouraudTexturedPolygon_Wide_ClipWithNegativeY(void)
{
RENDERVERTEX *curVertexPtr = (RenderPolygon.Vertices);
RENDERVERTEX *outputVerticesPtr = VerticesBuffer;
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_NY_Test(curVertexPtr);
Clip_LoopStart((RenderPolygon.Vertices))
Clip_Wide_NY_Test(nextVertexPtr);
Clip_Wide_NY_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd(VerticesBuffer)
}
/* Clip against positive X plane */
static void GouraudTexturedPolygon_Norm_ClipWithPositiveX(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_PX_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_PX_Test(nextVertexPtr);
Clip_PX_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
static void GouraudTexturedPolygon_Wide_ClipWithPositiveX(void)
{
RENDERVERTEX *curVertexPtr = VerticesBuffer;
RENDERVERTEX *outputVerticesPtr = (RenderPolygon.Vertices);
int verticesLeft = RenderPolygon.NumberOfVertices;
int numberOfPointsOutputted=0;
int curVertexInside = Clip_Wide_PX_Test(curVertexPtr);
Clip_LoopStart(VerticesBuffer)
Clip_Wide_PX_Test(nextVertexPtr);
Clip_Wide_PX_OutputXYZ
Clip_OutputUV
Clip_OutputI
Clip_LoopEnd((RenderPolygon.Vertices))
}
int PolygonWithinFrustrum(POLYHEADER *polyPtr)
{
char inFrustrumFlag=0;
char noClippingFlag=INSIDE_FRUSTRUM;
int *vertexNumberPtr = &polyPtr->Poly1stPt;
if (polyPtr->PolyFlags & iflag_notvis) return 0;
RenderPolygon.NumberOfVertices=0;
while(*vertexNumberPtr != Term)
{
int vertexNumber = *vertexNumberPtr++;
inFrustrumFlag |= FrustrumFlagForVertex[vertexNumber];
noClippingFlag &= FrustrumFlagForVertex[vertexNumber];
/* count the number of points in the polygon; this is used for all the loops that follow */
RenderPolygon.NumberOfVertices++;
}
if (inFrustrumFlag != INSIDE_FRUSTRUM) return 0;
/* at this point we know that the poly is inside the view frustrum */
/* if not a sprite, test direction of poly */
if (!( (Global_ShapeHeaderPtr->shapeflags&ShapeFlag_Sprite) || (polyPtr->PolyFlags & iflag_no_bfc) ))
{
VECTORCH pop;
VECTORCH *normalPtr = (VECTORCH*)(Global_ShapeNormals + polyPtr->PolyNormalIndex);
#if 1
if(Global_ODB_Ptr->ObMorphCtrl)
{
extern MORPHDISPLAY MorphDisplay;
SHAPEHEADER *shape1Ptr;
VECTORCH *shape1PointsPtr;
VECTORCH *shape2PointsPtr;
/* Set up the morph data */
GetMorphDisplay(&MorphDisplay, Global_ODB_Ptr);
shape1Ptr = MorphDisplay.md_sptr1;
if(MorphDisplay.md_lerp == 0x0000)
{
shape1PointsPtr = (VECTORCH *)*shape1Ptr->points;
pop = shape1PointsPtr[polyPtr->Poly1stPt];
}
else if(MorphDisplay.md_lerp == 0xffff)
{
SHAPEHEADER *shape2Ptr = MorphDisplay.md_sptr2;
shape2PointsPtr = (VECTORCH *)*shape2Ptr->points;
pop = shape2PointsPtr[polyPtr->Poly1stPt];
}
else
{
SHAPEHEADER *shape2Ptr = MorphDisplay.md_sptr2;
shape1PointsPtr = (VECTORCH *)(*shape1Ptr->points);
shape2PointsPtr = (VECTORCH *)(*shape2Ptr->points);
{
VECTORCH vertex1 = shape1PointsPtr[polyPtr->Poly1stPt];
VECTORCH vertex2 = shape2PointsPtr[polyPtr->Poly1stPt];
if( (vertex1.vx == vertex2.vx && vertex1.vy == vertex2.vy && vertex1.vz == vertex2.vz) )
{
pop = vertex1;
}
else
{
/* KJL 15:27:20 05/22/97 - I've changed this to speed things up, If a vertex
component has a magnitude greater than 32768 things will go wrong. */
pop.vx = vertex1.vx + (((vertex2.vx-vertex1.vx)*MorphDisplay.md_lerp)>>16);
pop.vy = vertex1.vy + (((vertex2.vy-vertex1.vy)*MorphDisplay.md_lerp)>>16);
pop.vz = vertex1.vz + (((vertex2.vz-vertex1.vz)*MorphDisplay.md_lerp)>>16);
}
}
}
}
else
#endif
{
/* Get the 1st polygon point as the POP */
VECTORCH *pointsArray = (VECTORCH*)(Global_ShapePoints);
pop = pointsArray[polyPtr->Poly1stPt];
}
pop.vx -= LocalView.vx;
pop.vy -= LocalView.vy;
pop.vz -= LocalView.vz;
if (Dot(&pop, normalPtr)>0) return 0;
}
if (noClippingFlag == INSIDE_FRUSTRUM) return 2;
/* yes, we need to draw poly */
return 1;
}
int PolygonShouldBeDrawn(POLYHEADER *polyPtr)
{
/* at this point we know that the poly is inside the view frustrum */
if (polyPtr->PolyFlags & iflag_notvis) return 0;
#if 1
/* if not a sprite, test direction of poly */
if (!( (Global_ShapeHeaderPtr->shapeflags&ShapeFlag_Sprite) || (polyPtr->PolyFlags & iflag_no_bfc) ))
{
/* KJL 16:49:14 7/10/97 -
***** MORPHED NORMALS SUPPORT NOT YET ADDED *****
*/
VECTORCH pop;
VECTORCH *normalPtr = (VECTORCH*)(Global_ShapeNormals + polyPtr->PolyNormalIndex);
VECTORCH *pointsArray = (VECTORCH*)(Global_ShapePoints);
/* Get the 1st polygon point as the POP */
pop.vx = pointsArray[polyPtr->Poly1stPt].vx - LocalView.vx;
pop.vy = pointsArray[polyPtr->Poly1stPt].vy - LocalView.vy;
pop.vz = pointsArray[polyPtr->Poly1stPt].vz - LocalView.vz;
if (Dot(&pop, normalPtr)>0) return 0;
}
#endif
#if 0
{
int *vertexNumberPtr = &polyPtr->Poly1stPt;
RenderPolygon.NumberOfVertices=0;
while(*vertexNumberPtr++ != Term)
{
/* count the number of points in the polygon; this is used for all the loops that follow */
RenderPolygon.NumberOfVertices++;
}
}
#elif 0
RenderPolygon.NumberOfVertices = 3;
#else