316 lines
8.9 KiB
C
316 lines
8.9 KiB
C
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#include <windows.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <math.h>
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#include <GL/gl.h>
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#include "glaux.h"
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#include "miscflt.h"
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#include "miscutil.h"
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#ifndef M_PI
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#define M_PI 3.1415926539
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#endif
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#define TWO_PI ((float)(2*M_PI))
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typedef struct lightRec {
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float amb[4];
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float diff[4];
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float spec[4];
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float pos[4];
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float spotDir[3];
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float spotExp;
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float spotCutoff;
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float atten[3];
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float trans[3];
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float rot[3];
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float swing[3];
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float arc[3];
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float arcIncr[3];
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} Light;
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static int useSAME_AMB_SPEC = 1;
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static float modelAmb[4] = { POINT_TWO, POINT_TWO, POINT_TWO, ONE };
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static float matAmb[4] = { POINT_TWO, POINT_TWO, POINT_TWO, ONE };
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static float matDiff[4] = { POINT_EIGHT, POINT_EIGHT, POINT_EIGHT, ONE };
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static float matSpec[4] = { POINT_FOUR, POINT_FOUR, POINT_FOUR, ONE };
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static float matEmission[4] = { ZERO, ZERO, ZERO, ONE };
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static char *geometry = NULL;
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#define NUM_LIGHTS 3
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static Light spots[] = {
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{
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{ POINT_TWO , ZERO, ZERO, ONE }, /* ambient */
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{ POINT_EIGHT, ZERO, ZERO, ONE }, /* diffuse */
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{ POINT_FOUR , ZERO, ZERO, ONE }, /* specular */
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{ ZERO, ZERO , ZERO, ONE }, /* position */
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{ ZERO, -ONE , ZERO }, /* direction */
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{ 20.0f }, { 60.0f }, /* exponent, cutoff */
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{ ONE, ZERO, ZERO }, /* attenuation */
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{ ZERO, 1.25f, ZERO }, /* translation */
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{ ZERO, ZERO, ZERO }, /* rotation */
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{ 20.0f, ZERO, 40.0f }, /* swing */
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{ ZERO, ZERO, ZERO }, /* arc */
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{ (float)(TWO_PI/70.0), ZERO, (float)(TWO_PI/140.0) } /* arc increment */
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},
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{
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{ ZERO, POINT_TWO, ZERO, ONE }, /* ambient */
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{ ZERO, POINT_EIGHT, ZERO, ONE }, /* diffuse */
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{ ZERO, POINT_FOUR, ZERO, ONE }, /* specular */
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{ ZERO, ZERO, ZERO, ONE }, /* position */
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{ ZERO, -ONE, ZERO }, /* direction */
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{ 20.0f }, { 60.0f }, /* exponent, cutoff */
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{ ONE, ZERO, ZERO }, /* attenuation */
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{ ZERO, 1.25f, ZERO }, /* translation */
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{ ZERO, ZERO, ZERO }, /* rotation */
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{ 20.0f, ZERO, 40.0f }, /* swing */
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{ ZERO, ZERO, ZERO }, /* arc */
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{ (float)(TWO_PI/120.0), ZERO, (float)(TWO_PI/60.0) } /* arc increment */
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},
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{
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{ ZERO, ZERO, POINT_TWO, ONE }, /* ambient */
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{ ZERO, ZERO, POINT_EIGHT, ONE }, /* diffuse */
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{ ZERO, ZERO, POINT_FOUR, ONE }, /* specular */
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{ ZERO, ZERO, ZERO, ONE }, /* position */
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{ ZERO, -ONE, ZERO }, /* direction */
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{ 20.0f }, { 60.0f }, /* exponent, cutoff */
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{ ONE, ZERO, ZERO }, /* attenuation */
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{ ZERO, 1.25f, ZERO }, /* translation */
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{ ZERO, ZERO, ZERO }, /* rotation */
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{ 20.0f, ZERO, 40.0f }, /* swing */
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{ ZERO, ZERO, ZERO }, /* arc */
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{ (float)(TWO_PI/50.0), ZERO, (float)(TWO_PI/100.0) } /* arc increment */
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}
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};
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void Display( void );
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void MyReshape( GLsizei Width, GLsizei Height );
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static void
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usage(int argc, char **argv)
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{
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printf("\n");
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printf("usage: %s [options]\n", argv[0]);
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printf("\n");
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printf(" Options:\n");
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printf(" -geometry Specify size and position WxH+X+Y\n");
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printf(" -lm Toggle lighting(SPECULAR and AMBIENT are/not same\n");
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printf("\n");
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exit(EXIT_FAILURE);
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}
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static void
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initLights(void)
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{
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int k;
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for (k=0; k<NUM_LIGHTS; ++k) {
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int lt = GL_LIGHT0+k;
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Light *light = &spots[k];
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glEnable(lt);
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glLightfv(lt, GL_AMBIENT, light->amb);
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glLightfv(lt, GL_DIFFUSE, light->diff);
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if (useSAME_AMB_SPEC)
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glLightfv(lt, GL_SPECULAR, light->amb);
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else
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glLightfv(lt, GL_SPECULAR, light->spec);
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glLightf(lt, GL_SPOT_EXPONENT, light->spotExp);
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glLightf(lt, GL_SPOT_CUTOFF, light->spotCutoff);
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glLightf(lt, GL_CONSTANT_ATTENUATION, light->atten[0]);
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glLightf(lt, GL_LINEAR_ATTENUATION, light->atten[1]);
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glLightf(lt, GL_QUADRATIC_ATTENUATION, light->atten[2]);
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}
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}
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static void
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aimLights(void)
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{
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int k;
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for (k=0; k<NUM_LIGHTS; ++k) {
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Light *light = &spots[k];
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light->rot[0] = light->swing[0] * SINF(light->arc[0]);
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light->arc[0] += light->arcIncr[0];
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if (light->arc[0] > TWO_PI) light->arc[0] -= TWO_PI;
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light->rot[1] = light->swing[1] * SINF(light->arc[1]);
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light->arc[1] += light->arcIncr[1];
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if (light->arc[1] > TWO_PI) light->arc[1] -= TWO_PI;
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light->rot[2] = light->swing[2] * SINF(light->arc[2]);
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light->arc[2] += light->arcIncr[2];
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if (light->arc[2] > TWO_PI) light->arc[2] -= TWO_PI;
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}
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}
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static void
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setLights(void)
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{
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int k;
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for (k=0; k<NUM_LIGHTS; ++k) {
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int lt = GL_LIGHT0+k;
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Light *light = &spots[k];
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glPushMatrix();
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glTranslatef(light->trans[0], light->trans[1], light->trans[2]);
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glRotatef(light->rot[0], ONE, ZERO, ZERO);
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glRotatef(light->rot[1], ZERO, ONE, ZERO);
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glRotatef(light->rot[2], ZERO, ZERO, ONE);
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glLightfv(lt, GL_POSITION, light->pos);
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glLightfv(lt, GL_SPOT_DIRECTION, light->spotDir);
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glPopMatrix();
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}
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}
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static void
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drawLights(void)
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{
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int k;
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glDisable(GL_LIGHTING);
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for (k=0; k<NUM_LIGHTS; ++k) {
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Light *light = &spots[k];
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glColor4fv(light->diff);
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glPushMatrix();
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glTranslatef(light->trans[0], light->trans[1], light->trans[2]);
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glRotatef(light->rot[0], ONE, ZERO, ZERO);
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glRotatef(light->rot[1], ZERO, ONE, ZERO);
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glRotatef(light->rot[2], ZERO, ZERO, ONE);
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glBegin(GL_LINES);
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glVertex3f(light->pos[0], light->pos[1], light->pos[2]);
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glVertex3f(light->spotDir[0], light->spotDir[1], light->spotDir[2]);
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glEnd();
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glPopMatrix();
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}
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glEnable(GL_LIGHTING);
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}
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static void
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drawPlane(int w, int h)
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{
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int i, j;
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float dw = ONE/w;
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float dh = ONE/h;
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glNormal3f(ZERO, ZERO, ONE);
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for (j=0; j<h; ++j) {
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glBegin(GL_TRIANGLE_STRIP);
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for (i=0; i<=w; ++i) {
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glVertex2f(dw * i, dh * (j+1));
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glVertex2f(dw * i, dh * j);
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}
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glEnd();
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}
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}
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int
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main(int argc, char **argv)
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{
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int width = 300, height = 300;
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int left = 50, top = 50;
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int i;
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/* process commmand line args */
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for (i = 1; i < argc; ++i)
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{
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if (!strcmp("-geometry", argv[i]))
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{
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i++;
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if ( !miscParseGeometry(argv[i],
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&left,
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&top,
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&width,
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&height )
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)
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{
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usage(argc, argv);
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}
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}
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else if (!strcmp("-lm", argv[i]))
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{
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useSAME_AMB_SPEC = !useSAME_AMB_SPEC;
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}
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else
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{
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usage(argc, argv);
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}
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}
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auxInitPosition( left, top, width, height );
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auxInitDisplayMode( AUX_RGBA | AUX_DOUBLE );
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auxInitWindow( "spotlight swing" );
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auxIdleFunc( Display );
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auxReshapeFunc( MyReshape );
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glMatrixMode(GL_PROJECTION);
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glFrustum(-1.0, 1.0, -1.0, 1.0, 2.0, 6.0);
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glMatrixMode(GL_MODELVIEW);
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glTranslatef(ZERO, ZERO, -THREE);
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glRotatef(45.0f, ONE, ZERO, ZERO);
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glEnable(GL_LIGHTING);
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glEnable(GL_NORMALIZE);
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glLightModelfv(GL_LIGHT_MODEL_AMBIENT, modelAmb);
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glLightModelf(GL_LIGHT_MODEL_LOCAL_VIEWER, (float)GL_TRUE);
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glLightModelf(GL_LIGHT_MODEL_TWO_SIDE, (float)GL_FALSE);
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glMaterialfv(GL_FRONT, GL_AMBIENT, matAmb);
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glMaterialfv(GL_FRONT, GL_DIFFUSE, matDiff);
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glMaterialfv(GL_FRONT, GL_SPECULAR, matSpec);
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glMaterialfv(GL_FRONT, GL_EMISSION, matEmission);
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glMaterialf(GL_FRONT, GL_SHININESS, TEN);
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initLights();
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auxMainLoop( Display );
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return(0);
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}
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void
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Display( void )
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{
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static float spin = ZERO;
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glClear(GL_COLOR_BUFFER_BIT);
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glPushMatrix();
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glRotatef(spin += 0.5f, ZERO, ONE, ZERO);
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if (spin > 360.0f) spin -= 360.0f;
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aimLights();
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setLights();
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glPushMatrix();
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glRotatef(-NINETY, ONE, ZERO, ZERO);
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glScalef(1.9f, 1.9f, ONE);
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glTranslatef(-HALF, -HALF, ZERO);
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drawPlane(16, 16);
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glPopMatrix();
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drawLights();
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glPopMatrix();
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auxSwapBuffers();
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}
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void
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MyReshape( GLsizei Width, GLsizei Height )
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{
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glViewport(0, 0, Width, Height);
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}
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