372 lines
8 KiB
C
372 lines
8 KiB
C
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/*
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* Copyright (c) 1993-1995 Argonaut Technologies Limited. All rights reserved.
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*
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* $Id: light8.c 1.1 1997/07/11 16:14:23 jon Exp JON $
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* $Locker: JON $
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*
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* Bits of the lighting model for indexed pixels
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*/
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#include "drv.h"
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#include "shortcut.h"
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#include "brassert.h"
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#include "math_ip.h"
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#include "lightmac.h"
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BR_RCS_ID("$Id: light8.c 1.1 1997/07/11 16:14:23 jon Exp JON $");
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#if 0
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/*
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* Lighting function for unlit indexed
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*/
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void SURFACE_CALL SurfaceIndexZero(br_renderer *self, br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
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{
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comp[C_I] = self->state.cache.comp_offsets[C_I];
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}
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/*
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* Lighting function for prelit indexed
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*/
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void SURFACE_CALL SurfaceIndexUnlit(br_renderer *self, br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
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{
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comp[C_I] = BR_MUL(self->state.cache.comp_scales[C_I],
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BR_CONST_DIV(BrIntToScalar(BR_ALPHA(colour)),256)) +
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self->state.cache.comp_offsets[C_I];
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}
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/*
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* Accumulate lighting for multiple active lights by calling the
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* appropriate sub-function for each light
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*
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* Write the results into comp[C_I]
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*/
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void SURFACE_CALL SurfaceIndexLit(br_renderer *self, br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
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{
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int i;
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struct active_light *alp = scache.lights;
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br_vector3 vp;
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br_vector3 vn;
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br_vector3 fvn;
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/*
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* Handle special case lighting of 1 model-space directional light
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*/
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if(scache.light_1md) {
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br_scalar l,dot;
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dot = BrVector3Dot(n,&alp->direction);
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if(dot <= BR_SCALAR(0.0)) {
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comp[C_I] = self->state.surface.ka;
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CLAMP_SCALE(C_I);
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return;
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}
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l = BR_MUL(dot, self->state.surface.kd);
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if (self->state.surface.ks != BR_SCALAR(0.0)) {
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/*
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* Specular
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*/
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dot = BrVector3Dot(n,&alp->half);
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/*
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* Phong lighting approximation from Gems IV pg. 385
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*/
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if(dot > SPECULARPOW_CUTOFF)
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l += SPECULAR_POWER(BR_MUL(self->state.surface.ks,alp->intensity));
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}
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comp[C_I] = l + self->state.surface.ka;
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/*
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* Scale final intensity to range of indices
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*/
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CLAMP_SCALE(C_I);
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return;
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}
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/*
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* Ambient component
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*/
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comp[C_I] = self->state.surface.ka;
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/*
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* Accumulate intensities for each active light in model space
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*/
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rend.eye_l = scache.eye_m_normalised;
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for(i=0; i < scache.nlights_model; i++, alp++)
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alp->accumulate_index(self, p, n, alp, comp);
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/*
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* See if any lights are to be calculated in view space
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*/
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if(scache.nlights_view) {
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/*
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* Transform point and normal into view space ...
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*/
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BrMatrix34ApplyP(&vp, p, &self->state.matrix.model_to_view);
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BrMatrix34TApplyV(&vn, n, &scache.view_to_model);
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BrVector3Normalise(&fvn, &vn);
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rend.eye_l.v[0] = BR_SCALAR(0);
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rend.eye_l.v[1] = BR_SCALAR(0);
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rend.eye_l.v[2] = BR_SCALAR(1);
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/*
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* ... and accumulate
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*/
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for(i=0; i < scache.nlights_view; i++, alp++)
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alp->accumulate_index(self, &vp, &fvn, alp, comp);
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}
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/*
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* Scale final intensity to range of indices
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*/
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CLAMP_SCALE(C_I);
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}
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/*
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* Lighting function that does nothing
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*/
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static void lightingIndexNull(br_renderer *self, br_vector3 *p, br_vector3 *n, struct active_light *alp,br_scalar *comp)
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{
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}
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/*
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* Lighting for directional light source in model space
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*/
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static void lightingIndexDirect(br_renderer *self, br_vector3 *p, br_vector3 *n, struct active_light *alp,br_scalar *comp)
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{
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br_scalar l,dot;
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dot = BrVector3Dot(n,&alp->direction);
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if(dot <= BR_SCALAR(0.0))
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return;
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l = BR_MUL(dot, self->state.surface.kd);
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if (self->state.surface.ks != BR_SCALAR(0.0)) {
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/*
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* Specular
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*/
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dot = BrVector3Dot(n,&alp->half);
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/*
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* Phong lighting approximation from Gems IV pg. 385
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*/
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if(dot > SPECULARPOW_CUTOFF)
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l += SPECULAR_POWER(BR_MUL(self->state.surface.ks,alp->intensity));
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}
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comp[C_I] += l;
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}
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/*
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* Lighting for point light source with attenuation
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* Index
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*/
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static void lightingIndexPoint(br_renderer *self, br_vector3 *p, br_vector3 *n, struct active_light *alp, br_scalar *comp)
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{
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br_scalar l,dot;
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br_vector3 dirn,dirn_norm;
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/*
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* Work out vector between point and light source
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*/
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BrVector3Sub(&dirn,&alp->position,p);
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BrVector3Normalise(&dirn_norm,&dirn);
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DIFFUSE_DOT();
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l = BR_MUL(dot,self->state.surface.kd);
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if (self->state.surface.ks != BR_SCALAR(0.0)) {
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/*
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* Specular
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*/
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SPECULAR_DOT();
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/*
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* Phong lighting approximation from Gems IV pg. 385
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*/
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if(dot > SPECULARPOW_CUTOFF)
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l += SPECULAR_POWER(self->state.surface.ks);
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}
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comp[C_I] += BR_MUL(l, alp->intensity);
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}
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/*
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* Lighting for point light source with attenuation
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* Index
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*/
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static void lightingIndexPointAttn(br_renderer *self, br_vector3 *p, br_vector3 *n, struct active_light *alp, br_scalar *comp)
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{
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br_scalar attn,dot,l,dist;
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br_vector3 dirn,dirn_norm;
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BrVector3Sub(&dirn,&alp->position, p);
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CALCULATE_DIRN_NORM();
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CALCULATE_ATTENUATION();
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DIFFUSE_DOT();
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l = BR_MUL(dot, self->state.surface.kd);
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if (self->state.surface.ks != BR_SCALAR(0.0)) {
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/*
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* Specular
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*/
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SPECULAR_DOT();
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/*
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* Phong lighting approximation from Gems IV pg. 385
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*/
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if(dot > SPECULARPOW_CUTOFF)
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l += SPECULAR_POWER(self->state.surface.ks);
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}
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comp[C_I] += BR_MUL(l,attn);
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}
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/*
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* Lighting for spot light source
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* Index
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*/
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static void lightingIndexSpot(br_renderer *self, br_vector3 *p, br_vector3 *n, struct active_light *alp, br_scalar *comp)
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{
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br_scalar dot_spot, dot, l, attn;
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br_vector3 dirn,dirn_norm;
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BrVector3Sub(&dirn,&alp->position,p);
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BrVector3Normalise(&dirn_norm,&dirn);
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SPOT_DOT();
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DIFFUSE_DOT();
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attn = SPOT_FALLOFF(alp->intensity);
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l = BR_MUL(dot, self->state.surface.kd);
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if (self->state.surface.ks != BR_SCALAR(0.0)) {
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/*
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* Specular
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*/
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SPECULAR_DOT();
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/*
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* Phong lighting approximation from Gems IV pg. 385
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*/
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if(dot > SPECULARPOW_CUTOFF)
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l += SPECULAR_POWER(self->state.surface.ks);
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}
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comp[C_I] += BR_MUL(l, attn);
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}
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/*
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* Lighting for spot light source with attenuation
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* Index
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*/
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static void lightingIndexSpotAttn(br_renderer *self, br_vector3 *p, br_vector3 *n, struct active_light *alp,br_scalar *comp)
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{
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br_scalar dot,dot_spot,dist,attn,l;
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br_vector3 dirn,dirn_norm;
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BrVector3Sub(&dirn,&alp->position,p);
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CALCULATE_DIRN_NORM();
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SPOT_DOT();
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DIFFUSE_DOT();
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CALCULATE_ATTENUATION();
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attn = SPOT_FALLOFF(attn);
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l = BR_MUL(dot, self->state.surface.kd);
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if (self->state.surface.ks != BR_SCALAR(0.0)) {
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/*
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* Specular
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*/
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SPECULAR_DOT();
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/*
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* Phong lighting approximation from Gems IV pg. 385
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*/
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if(dot > SPECULARPOW_CUTOFF)
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l += SPECULAR_POWER(self->state.surface.ks);
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}
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comp[C_I] += BR_MUL(l, attn);
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}
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/*
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* Select a per-light component accumulation function
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*/
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void ActiveLightAccumulateIndexSet(struct active_light *alp)
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{
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switch(alp->type) {
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case BRT_DIRECT:
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alp->accumulate_index = lightingIndexDirect;
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break;
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case BRT_POINT:
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if(alp->s->attenuation_l == BR_SCALAR(0.0) &&
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alp->s->attenuation_q == BR_SCALAR(0.0))
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alp->accumulate_index = lightingIndexPoint;
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else
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alp->accumulate_index = lightingIndexPointAttn;
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break;
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case BRT_SPOT:
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if(alp->s->attenuation_l == BR_SCALAR(0.0) &&
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alp->s->attenuation_q == BR_SCALAR(0.0))
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alp->accumulate_index = lightingIndexSpot;
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else
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alp->accumulate_index = lightingIndexSpotAttn;
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break;
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default:
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alp->accumulate_index = lightingIndexNull;
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}
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}
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#if 0
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/*
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* Special case for 1 directional light in model space
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*
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* Write the results into comp[C_I]
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*/
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void SURFACE_CALL SurfaceIndexLit1MD(br_renderer *self, br_vector3 *p, br_vector2 *map, br_vector3 *n, br_colour colour, br_scalar *comp)
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{
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struct active_light *alp = scache.lights;
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br_scalar l,dot;
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dot = BrVector3Dot(n,&alp->direction);
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if(dot <= BR_SCALAR(0.0))
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return;
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l = BR_MUL(dot, self->state.surface.kd);
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if (self->state.surface.ks != BR_SCALAR(0.0)) {
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/*
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* Specular
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*/
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dot = BrVector3Dot(n,&alp->half);
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/*
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* Phong lighting approximation from Gems IV pg. 385
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*/
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if(dot > SPECULARPOW_CUTOFF)
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l += SPECULAR_POWER(BR_MUL(self->state.surface.ks,alp->intensity));
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}
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comp[C_I] = l + self->state.surface.ka;
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/*
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* Scale final intensity to range of indices
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*/
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CLAMP_SCALE(C_I);
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}
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#endif
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#endif
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