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brender-1997/softrend/mapping.c
Foone Turing 5f8738d671 Adding BRender source
2022-05-03 14:31:40 -07:00

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/*
* Copyright (c) 1993-1995 Argonaut Technologies Limited. All rights reserved.
*
* $Id: mapping.c 2.10 1997/05/22 14:45:05 jon Exp $
* $Locker: $
*
* Generation of U,V components
*/
#include "drv.h"
#include "shortcut.h"
#include "brassert.h"
#include "math_ip.h"
BR_RCS_ID("$Id: mapping.c 2.10 1997/05/22 14:45:05 jon Exp $");
#define APPLY_UV(du,dv,su,sv) do { \
du = BR_ADD( \
BR_MAC2(self->state.cache.map_transform.m[0][0],su, \
self->state.cache.map_transform.m[1][0],sv), \
self->state.cache.map_transform.m[2][0]); \
dv = BR_ADD( \
BR_MAC2(self->state.cache.map_transform.m[0][1],su, \
self->state.cache.map_transform.m[1][1],sv), \
self->state.cache.map_transform.m[2][1]); \
} while (0)
/*
* Generate U,V for environment assuming infinite eye
*/
void SURFACE_CALL SurfaceMapEnvironmentInfinite(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *normal, br_colour colour, br_scalar *comp)
{
br_vector3 r,wr;
br_scalar d,cu,cv;
/*
* Generate reflected vector
*
* - - - - -
* R = 2N(N.E)-E
*/
d = BR_CONST_MUL(BrVector3Dot(&scache.eye_m_normalised,normal),2);
BrVector3Scale(&r,normal,d);
BrVector3Sub(&r,&r,&scache.eye_m_normalised);
/*
* If there is an environment frame, rotate vector into it
*/
if(self->state.matrix.view_to_environment_hint != BRT_DONT_CARE) {
BrMatrix34ApplyV(&wr, &r, &scache.model_to_environment);
BrVector3Normalise(&wr, &wr);
} else
wr = r;
/*
* Convert vector to environment coordinates
*/
cu = BrAngleToScalar(BR_ATAN2(wr.v[0],-wr.v[2]));
#if 0
cv = BrAngleToScalar(BR_ASIN(-wr.v[1]/2+BR_SCALAR(0.5)));
#else
cv = -wr.v[1]/2+BR_SCALAR(0.5);
#endif
APPLY_UV(comp[C_U],comp[C_V],cu,cv);
}
/*
* Generate U,V for environment assuming local eye
*/
void SURFACE_CALL SurfaceMapEnvironmentLocal(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *normal, br_colour colour, br_scalar *comp)
{
br_vector3 eye;
br_vector3 r,wr;
br_scalar d,cu,cv;
/*
* Generate eye vector -
*/
BrVector3Sub(&eye,&scache.eye_m,p);
BrVector3Normalise(&eye, &eye);
/*
* Generate reflected vector
*
* - - - - -
* R = 2N(N.E)-E
*/
d = BR_CONST_MUL(BrVector3Dot(&eye,normal),2);
BrVector3Scale(&r,normal,d);
BrVector3Sub(&r,&r,&eye);
/*
* If there is an environment frame, rotate vector into it
*/
if(self->state.matrix.view_to_environment_hint != BRT_DONT_CARE) {
BrMatrix34ApplyV(&wr, &r, &scache.model_to_environment);
BrVector3Normalise(&wr, &wr);
} else
wr = r;
/*
* Convert vector to environment coordinates
*/
cu = BrAngleToScalar(BR_ATAN2(wr.v[0],-wr.v[2]));
#if 0
cv = BrAngleToScalar(BR_ASIN(-wr.v[1]/2+BR_SCALAR(0.5)));
#else
cv = -wr.v[1]/2+BR_SCALAR(0.5);
#endif
APPLY_UV(comp[C_U],comp[C_V],cu,cv);
}
/*
* Take U,V from vertex y,z
*/
void SURFACE_CALL SurfaceMapGeometryX(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
{
APPLY_UV(comp[C_U],comp[C_V],p->v[1],p->v[2]);
}
void SURFACE_CALL SurfaceMapGeometryY(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
{
APPLY_UV(comp[C_U],comp[C_V],p->v[2],p->v[0]);
}
void SURFACE_CALL SurfaceMapGeometryZ(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
{
APPLY_UV(comp[C_U],comp[C_V],p->v[0],p->v[1]);
}
/*
* Take U,V from vertex u,v
*/
void SURFACE_CALL SurfaceMapGeometryMap(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
{
APPLY_UV(comp[C_U],comp[C_V],map->v[0],map->v[1]);
}
/*
* Scale only
*/
void SURFACE_CALL SurfaceMapGeometryMapScale(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
{
comp[C_U] = BR_MUL(self->state.cache.map_transform.m[0][0],map->v[0]);
comp[C_V] = BR_MUL(self->state.cache.map_transform.m[1][1],map->v[1]);
}
/*
* Scale and translate only
*/
void SURFACE_CALL SurfaceMapGeometryMapScaleTranslate(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
{
comp[C_U] = BR_ADD(BR_MUL(self->state.cache.map_transform.m[0][0],map->v[0]),self->state.cache.map_transform.m[2][0]);
comp[C_V] = BR_ADD(BR_MUL(self->state.cache.map_transform.m[1][1],map->v[1]),self->state.cache.map_transform.m[2][1]);
}
void SURFACE_CALL SurfaceMapGeometryMapCopy(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
{
comp[C_U] = map->v[0];
comp[C_V] = map->v[1];
}
#if BASED_FIXED
/*
* Take U,V from vertex, assumeing offset == 0 and scales are a power of 2
*/
void SURFACE_CALL SurfaceMapGeometryMapShift(br_renderer *self,
br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
{
comp[C_U] = (map->v[0] << self->state.cache.u_shift) + self->state.cache.map_transform.m[2][0];
comp[C_V] = (map->v[1] << self->state.cache.v_shift) + self->state.cache.map_transform.m[2][1];
}
#endif
#ifndef OpTriangleMapQuad
void BR_ASM_CALL OpTriangleMapQuad(struct brp_block *block, union brp_vertex *v0, union brp_vertex *v1, union brp_vertex *v2,
struct v11face *fp, struct temp_face *tfp)
{
br_vector2 *qv = (br_vector2*)&rend.renderer->state.cache.quad_transformed;
switch (rend.face_flags[rend.current_face] & BR_FACEF_QUAD_MASK) {
case BR_FACEF_QUAD_012:
v0->comp[C_U] = qv[0].v[0];
v0->comp[C_V] = qv[0].v[1];
v1->comp[C_U] = qv[1].v[0];
v1->comp[C_V] = qv[1].v[1];
v2->comp[C_U] = qv[2].v[0];
v2->comp[C_V] = qv[2].v[1];
break;
case BR_FACEF_QUAD_123:
v0->comp[C_U] = qv[1].v[0];
v0->comp[C_V] = qv[1].v[1];
v1->comp[C_U] = qv[2].v[0];
v1->comp[C_V] = qv[2].v[1];
v2->comp[C_U] = qv[3].v[0];
v2->comp[C_V] = qv[3].v[1];
break;
case BR_FACEF_QUAD_230:
v0->comp[C_U] = qv[2].v[0];
v0->comp[C_V] = qv[2].v[1];
v1->comp[C_U] = qv[3].v[0];
v1->comp[C_V] = qv[3].v[1];
v2->comp[C_U] = qv[0].v[0];
v2->comp[C_V] = qv[0].v[1];
break;
case BR_FACEF_QUAD_301:
v0->comp[C_U] = qv[3].v[0];
v0->comp[C_V] = qv[3].v[1];
v1->comp[C_U] = qv[0].v[0];
v1->comp[C_V] = qv[0].v[1];
v2->comp[C_U] = qv[1].v[0];
v2->comp[C_V] = qv[1].v[1];
break;
case BR_FACEF_QUAD_032:
v0->comp[C_U] = qv[0].v[0];
v0->comp[C_V] = qv[0].v[1];
v1->comp[C_U] = qv[3].v[0];
v1->comp[C_V] = qv[3].v[1];
v2->comp[C_U] = qv[2].v[0];
v2->comp[C_V] = qv[2].v[1];
break;
case BR_FACEF_QUAD_103:
v0->comp[C_U] = qv[1].v[0];
v0->comp[C_V] = qv[1].v[1];
v1->comp[C_U] = qv[0].v[0];
v1->comp[C_V] = qv[0].v[1];
v2->comp[C_U] = qv[3].v[0];
v2->comp[C_V] = qv[3].v[1];
break;
case BR_FACEF_QUAD_210:
v0->comp[C_U] = qv[2].v[0];
v0->comp[C_V] = qv[2].v[1];
v1->comp[C_U] = qv[1].v[0];
v1->comp[C_V] = qv[1].v[1];
v2->comp[C_U] = qv[0].v[0];
v2->comp[C_V] = qv[0].v[1];
break;
case BR_FACEF_QUAD_321:
v0->comp[C_U] = qv[3].v[0];
v0->comp[C_V] = qv[3].v[1];
v1->comp[C_U] = qv[2].v[0];
v1->comp[C_V] = qv[2].v[1];
v2->comp[C_U] = qv[1].v[0];
v2->comp[C_V] = qv[1].v[1];
break;
}
block->chain->render(block->chain, v0,v1,v2, fp, tfp);
}
#endif
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