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- #include "zgl.h"
- #include "msghandling.h"
-
- void glopMaterial(GLContext *c,GLParam *p)
- {
- int mode=p[1].i;
- int type=p[2].i;
- float *v=&p[3].f;
- int i;
- GLMaterial *m;
-
- if (mode == GL_FRONT_AND_BACK) {
- p[1].i=GL_FRONT;
- glopMaterial(c,p);
- mode=GL_BACK;
- }
- if (mode == GL_FRONT) m=&c->materials[0];
- else m=&c->materials[1];
-
- switch(type) {
- case GL_EMISSION:
- for(i=0;i<4;i++)
- m->emission.v[i]=v[i];
- break;
- case GL_AMBIENT:
- for(i=0;i<4;i++)
- m->ambient.v[i]=v[i];
- break;
- case GL_DIFFUSE:
- for(i=0;i<4;i++)
- m->diffuse.v[i]=v[i];
- break;
- case GL_SPECULAR:
- for(i=0;i<4;i++)
- m->specular.v[i]=v[i];
- break;
- case GL_SHININESS:
- m->shininess=v[0];
- m->shininess_i = (v[0]/128.0f)*SPECULAR_BUFFER_RESOLUTION;
- break;
- case GL_AMBIENT_AND_DIFFUSE:
- for(i=0;i<4;i++)
- m->diffuse.v[i]=v[i];
- for(i=0;i<4;i++)
- m->ambient.v[i]=v[i];
- break;
- default:
- assert(0);
- }
- }
-
- void glopColorMaterial(GLContext *c,GLParam *p)
- {
- int mode=p[1].i;
- int type=p[2].i;
-
- c->current_color_material_mode=mode;
- c->current_color_material_type=type;
- }
-
- void glopLight(GLContext *c,GLParam *p)
- {
- int light=p[1].i;
- int type=p[2].i;
- V4 v;
- GLLight *l;
- int i;
-
- assert(light >= GL_LIGHT0 && light < GL_LIGHT0+MAX_LIGHTS );
-
- l=&c->lights[light-GL_LIGHT0];
-
- for(i=0;i<4;i++) v.v[i]=p[3+i].f;
-
- switch(type) {
- case GL_AMBIENT:
- l->ambient=v;
- break;
- case GL_DIFFUSE:
- l->diffuse=v;
- break;
- case GL_SPECULAR:
- l->specular=v;
- break;
- case GL_POSITION:
- {
- V4 pos;
- gl_M4_MulV4(&pos,c->matrix_stack_ptr[0],&v);
-
- l->position=pos;
-
- if (l->position.v[3] == 0) {
- l->norm_position.X=pos.X;
- l->norm_position.Y=pos.Y;
- l->norm_position.Z=pos.Z;
-
- gl_V3_Norm(&l->norm_position);
- }
- }
- break;
- case GL_SPOT_DIRECTION:
- for(i=0;i<3;i++) {
- l->spot_direction.v[i]=v.v[i];
- l->norm_spot_direction.v[i]=v.v[i];
- }
- gl_V3_Norm(&l->norm_spot_direction);
- break;
- case GL_SPOT_EXPONENT:
- l->spot_exponent=v.v[0];
- break;
- case GL_SPOT_CUTOFF:
- {
- float a=v.v[0];
- assert(a == 180 || (a>=0 && a<=90));
- l->spot_cutoff=a;
- if (a != 180) l->cos_spot_cutoff=cos(a * M_PI / 180.0);
- }
- break;
- case GL_CONSTANT_ATTENUATION:
- l->attenuation[0]=v.v[0];
- break;
- case GL_LINEAR_ATTENUATION:
- l->attenuation[1]=v.v[0];
- break;
- case GL_QUADRATIC_ATTENUATION:
- l->attenuation[2]=v.v[0];
- break;
- default:
- assert(0);
- }
- }
-
-
- void glopLightModel(GLContext *c,GLParam *p)
- {
- int pname=p[1].i;
- float *v=&p[2].f;
- int i;
-
- switch(pname) {
- case GL_LIGHT_MODEL_AMBIENT:
- for(i=0;i<4;i++)
- c->ambient_light_model.v[i]=v[i];
- break;
- case GL_LIGHT_MODEL_LOCAL_VIEWER:
- c->local_light_model=(int)v[0];
- break;
- case GL_LIGHT_MODEL_TWO_SIDE:
- c->light_model_two_side = (int)v[0];
- break;
- default:
- tgl_warning("glopLightModel: illegal pname: 0x%x\n", pname);
- //assert(0);
- break;
- }
- }
-
-
- static inline float clampf(float a,float min,float max)
- {
- if (a<min) return min;
- else if (a>max) return max;
- else return a;
- }
-
- void gl_enable_disable_light(GLContext *c,int light,int v)
- {
- GLLight *l=&c->lights[light];
- if (v && !l->enabled) {
- l->enabled=1;
- l->next=c->first_light;
- c->first_light=l;
- l->prev=NULL;
- } else if (!v && l->enabled) {
- l->enabled=0;
- if (l->prev == NULL) c->first_light=l->next;
- else l->prev->next=l->next;
- if (l->next != NULL) l->next->prev=l->prev;
- }
- }
-
- /* non optimized lightening model */
- void gl_shade_vertex(GLContext *c,GLVertex *v)
- {
- float R,G,B,A;
- GLMaterial *m;
- GLLight *l;
- V3 n,s,d;
- float dist,tmp,att,dot,dot_spot,dot_spec;
- int twoside = c->light_model_two_side;
-
- m=&c->materials[0];
-
- n.X=v->normal.X;
- n.Y=v->normal.Y;
- n.Z=v->normal.Z;
-
- R=m->emission.v[0]+m->ambient.v[0]*c->ambient_light_model.v[0];
- G=m->emission.v[1]+m->ambient.v[1]*c->ambient_light_model.v[1];
- B=m->emission.v[2]+m->ambient.v[2]*c->ambient_light_model.v[2];
- A=clampf(m->diffuse.v[3],0,1);
-
- for(l=c->first_light;l!=NULL;l=l->next) {
- float lR,lB,lG;
-
- /* ambient */
- lR=l->ambient.v[0] * m->ambient.v[0];
- lG=l->ambient.v[1] * m->ambient.v[1];
- lB=l->ambient.v[2] * m->ambient.v[2];
-
- if (l->position.v[3] == 0) {
- /* light at infinity */
- d.X=l->position.v[0];
- d.Y=l->position.v[1];
- d.Z=l->position.v[2];
- att=1;
- } else {
- /* distance attenuation */
- d.X=l->position.v[0]-v->ec.v[0];
- d.Y=l->position.v[1]-v->ec.v[1];
- d.Z=l->position.v[2]-v->ec.v[2];
- dist=sqrt(d.X*d.X+d.Y*d.Y+d.Z*d.Z);
- if (dist>1E-3) {
- tmp=1/dist;
- d.X*=tmp;
- d.Y*=tmp;
- d.Z*=tmp;
- }
- att=1.0f/(l->attenuation[0]+dist*(l->attenuation[1]+
- dist*l->attenuation[2]));
- }
- dot=d.X*n.X+d.Y*n.Y+d.Z*n.Z;
- if (twoside && dot < 0) dot = -dot;
- if (dot>0) {
- /* diffuse light */
- lR+=dot * l->diffuse.v[0] * m->diffuse.v[0];
- lG+=dot * l->diffuse.v[1] * m->diffuse.v[1];
- lB+=dot * l->diffuse.v[2] * m->diffuse.v[2];
-
- /* spot light */
- if (l->spot_cutoff != 180) {
- dot_spot=-(d.X*l->norm_spot_direction.v[0]+
- d.Y*l->norm_spot_direction.v[1]+
- d.Z*l->norm_spot_direction.v[2]);
- if (twoside && dot_spot < 0) dot_spot = -dot_spot;
- if (dot_spot < l->cos_spot_cutoff) {
- /* no contribution */
- continue;
- } else {
- /* TODO: optimize */
- if (l->spot_exponent > 0) {
- att=att*pow(dot_spot,l->spot_exponent);
- }
- }
- }
-
- /* specular light */
-
- if (c->local_light_model) {
- V3 vcoord;
- vcoord.X=v->ec.X;
- vcoord.Y=v->ec.Y;
- vcoord.Z=v->ec.Z;
- gl_V3_Norm(&vcoord);
- s.X=d.X-vcoord.X;
- s.Y=d.Y-vcoord.X;
- s.Z=d.Z-vcoord.X;
- } else {
- s.X=d.X;
- s.Y=d.Y;
- s.Z=d.Z+1.0;
- }
- dot_spec=n.X*s.X+n.Y*s.Y+n.Z*s.Z;
- if (twoside && dot_spec < 0) dot_spec = -dot_spec;
- if (dot_spec>0) {
- GLSpecBuf *specbuf;
- int idx;
- tmp=sqrt(s.X*s.X+s.Y*s.Y+s.Z*s.Z);
- if (tmp > 1E-3) {
- dot_spec=dot_spec / tmp;
- }
-
- /* TODO: optimize */
- /* testing specular buffer code */
- /* dot_spec= pow(dot_spec,m->shininess);*/
- specbuf = specbuf_get_buffer(c, m->shininess_i, m->shininess);
- idx = (int)(dot_spec*SPECULAR_BUFFER_SIZE);
- if (idx > SPECULAR_BUFFER_SIZE) idx = SPECULAR_BUFFER_SIZE;
- dot_spec = specbuf->buf[idx];
- lR+=dot_spec * l->specular.v[0] * m->specular.v[0];
- lG+=dot_spec * l->specular.v[1] * m->specular.v[1];
- lB+=dot_spec * l->specular.v[2] * m->specular.v[2];
- }
- }
-
- R+=att * lR;
- G+=att * lG;
- B+=att * lB;
- }
-
- v->color.v[0]=clampf(R,0,1);
- v->color.v[1]=clampf(G,0,1);
- v->color.v[2]=clampf(B,0,1);
- v->color.v[3]=A;
- }
-
-