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gimp/plug-ins/Lighting/lighting_preview.c
Manish Singh 7fc4de2bf4 More fun. 
-Yosh
1998-06-11 06:04:59 +00:00

405 lines
11 KiB
C
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/*************************************************/
/* Compute a preview image and preview wireframe */
/*************************************************/
#include "lighting_preview.h"
gint lightx,lighty;
BackBuffer backbuf={0,0,0,0,NULL};
gdouble *xpostab=NULL,*ypostab=NULL;
/* Protos */
/* ====== */
void draw_preview_image (gint recompute);
void update_light (gint xpos,gint ypos);
void draw_light_marker (gint xpos,gint ypos);
void clear_light_marker (void);
void compute_preview (gint startx,gint starty,gint w,gint h)
{
gint xcnt,ycnt,f1,f2;
gdouble imagex,imagey;
gint32 index=0;
GckRGB color,darkcheck,lightcheck,temp;
GckVector3 pos;
get_ray_func ray_func;
xpostab = (gdouble *)malloc(sizeof(gdouble)*w);
ypostab = (gdouble *)malloc(sizeof(gdouble)*h);
for (xcnt=0;xcnt<w;xcnt++)
xpostab[xcnt]=(gdouble)width*((gdouble)xcnt/(gdouble)w);
for (ycnt=0;ycnt<h;ycnt++)
ypostab[ycnt]=(gdouble)height*((gdouble)ycnt/(gdouble)h);
init_compute();
precompute_init(width,height);
gck_rgb_set(&lightcheck,0.75,0.75,0.75);
gck_rgb_set(&darkcheck, 0.50,0.50,0.50);
gck_rgb_set(&color,0.3,0.7,1.0);
if (mapvals.bump_mapped==TRUE && mapvals.bumpmap_id!=-1)
{
gimp_pixel_rgn_init (&bump_region, gimp_drawable_get(mapvals.bumpmap_id),
0, 0, width, height, FALSE, FALSE);
}
imagey=0;
if (mapvals.previewquality)
ray_func = get_ray_color;
else
ray_func = get_ray_color_no_bilinear;
if (mapvals.env_mapped==TRUE && mapvals.envmap_id!=-1)
{
env_width = gimp_drawable_width(mapvals.envmap_id);
env_height = gimp_drawable_height(mapvals.envmap_id);
gimp_pixel_rgn_init (&env_region, gimp_drawable_get(mapvals.envmap_id),
0, 0, env_width, env_height, FALSE, FALSE);
if (mapvals.previewquality)
ray_func = get_ray_color_ref;
else
ray_func = get_ray_color_no_bilinear_ref;
}
for (ycnt=0;ycnt<PREVIEW_HEIGHT;ycnt++)
{
for (xcnt=0;xcnt<PREVIEW_WIDTH;xcnt++)
{
if ((ycnt>=starty && ycnt<(starty+h)) &&
(xcnt>=startx && xcnt<(startx+w)))
{
imagex=xpostab[xcnt-startx];
imagey=ypostab[ycnt-starty];
pos=int_to_posf(imagex,imagey);
if (mapvals.bump_mapped==TRUE && mapvals.bumpmap_id!=-1 && xcnt==startx)
{
pos_to_float(pos.x,pos.y,&imagex,&imagey);
precompute_normals(0,width,(gint)(imagey+0.5));
}
color=(*ray_func)(&pos);
if (color.a<1.0)
{
f1=((xcnt % 32)<16);
f2=((ycnt % 32)<16);
f1=f1^f2;
if (f1)
{
if (color.a==0.0)
color=lightcheck;
else
{
gck_rgb_mul(&color,color.a);
temp=lightcheck;
gck_rgb_mul(&temp,1.0-color.a);
gck_rgb_add(&color,&temp);
}
}
else
{
if (color.a==0.0)
color=darkcheck;
else
{
gck_rgb_mul(&color,color.a);
temp=darkcheck;
gck_rgb_mul(&temp,1.0-color.a);
gck_rgb_add(&color,&temp);
}
}
}
preview_rgb_data[index++]=(guchar)(255.0*color.r);
preview_rgb_data[index++]=(guchar)(255.0*color.g);
preview_rgb_data[index++]=(guchar)(255.0*color.b);
imagex++;
}
else
{
preview_rgb_data[index++]=200;
preview_rgb_data[index++]=200;
preview_rgb_data[index++]=200;
}
}
}
gck_rgb_to_gdkimage(appwin->visinfo, preview_rgb_data, image, PREVIEW_WIDTH, PREVIEW_HEIGHT);
}
void blah()
{
/* First, compute the linear mapping (x,y,x+w,y+h) to (0,0,pw,ph) */
/* ============================================================== */
/* realw=(p2.x-p1.x);
realh=(p2.y-p1.y);
for (xcnt=0;xcnt<pw;xcnt++)
xpostab[xcnt]=p1.x+realw*((double)xcnt/(double)pw);
for (ycnt=0;ycnt<ph;ycnt++)
ypostab[ycnt]=p1.y+realh*((double)ycnt/(double)ph); */
/* Compute preview using the offset tables */
/* ======================================= */
/* if (mapvals.transparent_background==TRUE)
gck_rgba_set(&background,0.0,0.0,0.0,0.0);
else
{
gimp_palette_get_background(&r,&g,&b);
background.r=(gdouble)r/255.0;
background.g=(gdouble)g/255.0;
background.b=(gdouble)b/255.0;
background.a=1.0;
}
gck_rgb_set(&lightcheck,0.75,0.75,0.75);
gck_rgb_set(&darkcheck, 0.50,0.50,0.50);
gck_vector3_set(&p2,-1.0,-1.0,0.0);
for (ycnt=0;ycnt<ph;ycnt++)
{
for (xcnt=0;xcnt<pw;xcnt++)
{
p1.x=xpostab[xcnt];
p1.y=ypostab[ycnt]; */
/* If oldpos = newpos => same color, so skip shading */
/* ================================================= */
/* p2=p1;
color=get_ray_color(&p1);
if (color.a<1.0)
{
f1=((xcnt % 32)<16);
f2=((ycnt % 32)<16);
f1=f1^f2;
if (f1)
{
if (color.a==0.0)
color=lightcheck;
else
{
gck_rgb_mul(&color,color.a);
temp=lightcheck;
gck_rgb_mul(&temp,1.0-color.a);
gck_rgb_add(&color,&temp);
}
}
else
{
if (color.a==0.0)
color=darkcheck;
else
{
gck_rgb_mul(&color,color.a);
temp=darkcheck;
gck_rgb_mul(&temp,1.0-color.a);
gck_rgb_add(&color,&temp);
}
}
}
preview_rgb_data[index++]=(guchar)(color.r*255.0);
preview_rgb_data[index++]=(guchar)(color.g*255.0);
preview_rgb_data[index++]=(guchar)(color.b*255.0);
}
} */
/* Convert to visual type */
/* ====================== */
/* gck_rgb_to_gdkimage(appwin->visinfo,preview_rgb_data,image,pw,ph); */
}
/*************************************************/
/* Check if the given position is within the */
/* light marker. Return TRUE if so, FALSE if not */
/*************************************************/
gint check_light_hit(gint xpos,gint ypos)
{
/* gdouble dx,dy,r;
if (mapvals.lightsource.type==POINT_LIGHT)
{
dx=(gdouble)lightx-xpos;
dy=(gdouble)lighty-ypos;
r=sqrt(dx*dx+dy*dy)+0.5;
if ((gint)r>7)
return(FALSE);
else
return(TRUE);
}
*/
return(FALSE);
}
/****************************************/
/* Draw a marker to show light position */
/****************************************/
void draw_light_marker(gint xpos,gint ypos)
{
/* gck_gc_set_foreground(appwin->visinfo,gc,0,50,255);
gck_gc_set_background(appwin->visinfo,gc,0,0,0);
gdk_gc_set_function(gc,GDK_COPY);
if (mapvals.lightsource.type==POINT_LIGHT)
{
lightx=xpos;
lighty=ypos; */
/* Save background */
/* =============== */
/* backbuf.x=lightx-7;
backbuf.y=lighty-7;
backbuf.w=14;
backbuf.h=14; */
/* X doesn't like images that's outside a window, make sure */
/* we get the backbuffer image from within the boundaries */
/* ======================================================== */
/* if (backbuf.x<0)
backbuf.x=0;
else if ((backbuf.x+backbuf.w)>PREVIEW_WIDTH)
backbuf.w=(PREVIEW_WIDTH-backbuf.x);
if (backbuf.y<0)
backbuf.y=0;
else if ((backbuf.y+backbuf.h)>PREVIEW_HEIGHT)
backbuf.h=(PREVIEW_WIDTH-backbuf.y);
backbuf.image=gdk_image_get(previewarea->window,backbuf.x,backbuf.y,backbuf.w,backbuf.h);
gdk_draw_arc(previewarea->window,gc,TRUE,lightx-7,lighty-7,14,14,0,360*64);
} */
}
void clear_light_marker(void)
{
/* Restore background if it has been saved */
/* ======================================= */
/* if (backbuf.image!=NULL)
{
gck_gc_set_foreground(appwin->visinfo,gc,255,255,255);
gck_gc_set_background(appwin->visinfo,gc,0,0,0);
gdk_gc_set_function(gc,GDK_COPY);
gdk_draw_image(previewarea->window,gc,backbuf.image,0,0,backbuf.x,backbuf.y,
backbuf.w,backbuf.h);
gdk_image_destroy(backbuf.image);
backbuf.image=NULL;
} */
}
void draw_lights(void)
{
/* gdouble dxpos,dypos;
gint xpos,ypos;
clear_light_marker();
gck_3d_to_2d(startx,starty,pw,ph,&dxpos,&dypos,&mapvals.viewpoint,
&mapvals.lightsource.position);
xpos=(gint)(dxpos+0.5);
ypos=(gint)(dypos+0.5);
if (xpos>=0 && xpos<=PREVIEW_WIDTH && ypos>=0 && ypos<=PREVIEW_HEIGHT)
draw_light_marker(xpos,ypos); */
}
/*************************************************/
/* Update light position given new screen coords */
/*************************************************/
void update_light(gint xpos,gint ypos)
{
/* gint startx,starty,pw,ph;
pw=PREVIEW_WIDTH >> mapvals.preview_zoom_factor;
ph=PREVIEW_HEIGHT >> mapvals.preview_zoom_factor;
startx=(PREVIEW_WIDTH-pw)>>1;
starty=(PREVIEW_HEIGHT-ph)>>1;
gck_2d_to_3d(startx,starty,pw,ph,xpos,ypos,&mapvals.viewpoint,
&mapvals.lightsource.position);
draw_lights(startx,starty,pw,ph); */
}
void compute_preview_rectangle(gint *xp,gint *yp,gint *wid,gint *heig)
{
gdouble x,y,w,h;
if (width>=height)
{
w=(PREVIEW_WIDTH-50.0);
h=(gdouble)height*(w/(gdouble)width);
x=(PREVIEW_WIDTH-w)/2.0;
y=(PREVIEW_HEIGHT-h)/2.0;
}
else
{
h=(PREVIEW_HEIGHT-50.0);
w=(gdouble)width*(h/(gdouble)height);
x=(PREVIEW_WIDTH-w)/2.0;
y=(PREVIEW_HEIGHT-h)/2.0;
}
*xp=(gint)(x+0.5);
*yp=(gint)(y+0.5);
*wid=(gint)(w+0.5);
*heig=(gint)(h+0.5);
}
/******************************************************************/
/* Draw preview image. if DoCompute is TRUE then recompute image. */
/******************************************************************/
void draw_preview_image(gint recompute)
{
gint startx,starty,pw,ph;
gck_gc_set_foreground(appwin->visinfo,gc,255,255,255);
gck_gc_set_background(appwin->visinfo,gc,0,0,0);
gdk_gc_set_function(gc,GDK_COPY);
compute_preview_rectangle(&startx,&starty,&pw,&ph);
if (recompute==TRUE)
{
gck_cursor_set(previewarea->window,GDK_WATCH);
compute_preview(startx,starty,pw,ph);
gck_cursor_set(previewarea->window,GDK_HAND2);
clear_light_marker();
}
/* if (pw!=PREVIEW_WIDTH)
gdk_window_clear(previewarea->window); */
gdk_draw_image(previewarea->window,gc,image,0,0,0,0,PREVIEW_WIDTH,PREVIEW_HEIGHT);
/* draw_lights(); */
}
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