paul@manray.sgi.com (Paul Haeberli) (03/14/90)
Using lmdef and lmbind is kind of tricky. Here's a piece of
C code that makes it easy to use the GL to create lighted images.
paul h
paul@sgi.com
/*
* glshade -
* Simple support for describing materials and light sources
* This makes it easy for people without PHD's in GL to actually
* shade surfaces.
*
* Paul Haeberli - 1990
*
*
* exports:
* matrixinit();
* shadeinit();
* shadeon();
* shadeoff();
* setdiffuse(r,g,b);
* setspecular(r,g,b);
* setshininess(s);
*
*
* Here is the structure of a typical program:
*
* main()
* {
* winopen("shade");
* RGBmode();
* doublebuffer();
* gconfig();
* winopen("blat");
* matrixinit(); you must use two matrix model
* .
* .
* perspective( . . . . );
* shadeinit(); init shading after perspective
* .
* .
* while(1)
* cpack(0x00404060); clear the screen
* clear();
* zclear();
* .
* .
* shadeon(); turn lighting on
* setdiffuse(1.0,0.0,0.0); make the diffuse color red
* drawobjwithnormals(); draw the object
* shadeoff(); turn lighting off
* .
* .
* swapbuffers(); swap buffers
* }
* }
*/
#include "stdio.h"
#include "gl.h"
static int matrixinited;
static float idmat[4][4] = {
1.0, 0.0, 0.0, 0.0,
0.0, 1.0, 0.0, 0.0,
0.0, 0.0, 1.0, 0.0,
0.0, 0.0, 0.0, 1.0
};
matrixinit()
{
mmode(MVIEWING);
loadmatrix(idmat);
matrixinited = 1;
}
shadeinit()
{
initmaterial();
initlights();
shadeoff();
}
shadeon()
{
lmbind(LMODEL,1);
}
shadeoff()
{
lmbind(LMODEL,0);
}
setdiffuse(r,g,b)
float r, g, b;
{
float c[3];
lmcolor(LMC_DIFFUSE);
c[0] = r;
c[1] = g;
c[2] = b;
c3f(c);
lmcolor(LMC_COLOR);
}
setspecular(r,g,b)
float r, g, b;
{
float c[3];
lmcolor(LMC_SPECULAR);
c[0] = r;
c[1] = g;
c[2] = b;
c3f(c);
lmcolor(LMC_COLOR);
}
setshininess(s)
float s;
{
float mat_desc[2];
mat_desc[0] = SHININESS;
mat_desc[1] = s;
lmdef(DEFMATERIAL, 1, 2, mat_desc);
}
static initmaterial()
{
float mat_desc[18];
mat_desc[0] = EMISSION;
mat_desc[1] = 0.0;
mat_desc[2] = 0.0;
mat_desc[3] = 0.0;
mat_desc[4] = AMBIENT;
mat_desc[5] = 0.0;
mat_desc[6] = 0.0;
mat_desc[7] = 0.0;
mat_desc[8] = DIFFUSE;
mat_desc[9] = 0.7;
mat_desc[10] = 0.7;
mat_desc[11] = 0.7;
mat_desc[12] = SPECULAR;
mat_desc[13] = 0.9;
mat_desc[14] = 0.9;
mat_desc[15] = 0.9;
mat_desc[16] = SHININESS;
mat_desc[17] = 40.0;
lmdef(DEFMATERIAL, 1, 18, mat_desc);
lmbind(MATERIAL, 1);
}
static initlights()
{
float li_desc[10];
li_desc[0] = AMBIENT;
li_desc[1] = 0.10;
li_desc[2] = 0.10;
li_desc[3] = 0.10;
li_desc[4] = LOCALVIEWER;
li_desc[5] = 0.0;
li_desc[6] = ATTENUATION;
li_desc[7] = 1.0;
li_desc[8] = 0.0;
li_desc[9] = LMNULL;
lmdef(DEFLMODEL, 1, 0, li_desc);
lmbind(LMODEL, 1);
makelight(0,0.0,0.0,10.0);
makelight(1,-5.0,5.0,10.0);
makelight(2, 5.0,5.0,10.0);
}
static makelight(i,x,y,z)
int i;
float x, y, z;
{
float li_desc[14];
li_desc[0] = AMBIENT;
li_desc[1] = 0.1;
li_desc[2] = 0.1;
li_desc[3] = 0.1;
li_desc[4] = LCOLOR;
li_desc[5] = 0.5;
li_desc[6] = 0.5;
li_desc[7] = 0.5;
li_desc[8] = POSITION;
li_desc[9] = x;
li_desc[10] = y;
li_desc[11] = z;
li_desc[12] = 0.0; /* zero means infinte light */
li_desc[13] = LMNULL;
lmdef(DEFLIGHT, i+1, 14, li_desc);
lmbind(LIGHT0+i, i+1);
}buchanan@cs.ubc.ca (John Buchanan) (03/14/90)
In article <53450@sgi.sgi.com> paul@manray.sgi.com (Paul Haeberli) writes: >#include "stdio.h" >#include "gl.h" I will probably get nailed to the wall for this, but shouldn't this be: #include <stdio.h> #include <gl.h> Since we really do not want cpp to look for these files in the current directory. ========================================================================= | |===============================| | John Buchanan (juancho) | buchanan@cs.ubc.ca | | Imager Manager |===============================| | Imager | (604) 228-2218 | | Department of Computer Science |===============================| | University of British Columbia | Standard disclaimer | | Vancouver, BC, Canada | included in this | | | box, right here. | =========================================================================