From afb833d4e89c312460a4ab9ed6a7a8ca4ebbfe1c Mon Sep 17 00:00:00 2001 From: jtg Date: Thu, 19 Aug 1999 00:55:39 +0000 Subject: Initial revision --- progs/samples/fog.c | 311 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 311 insertions(+) create mode 100644 progs/samples/fog.c (limited to 'progs/samples/fog.c') diff --git a/progs/samples/fog.c b/progs/samples/fog.c new file mode 100644 index 00000000000..96534dddcb6 --- /dev/null +++ b/progs/samples/fog.c @@ -0,0 +1,311 @@ +/* + * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc. + * + * Permission to use, copy, modify, distribute, and sell this software and + * its documentation for any purpose is hereby granted without fee, provided + * that (i) the above copyright notices and this permission notice appear in + * all copies of the software and related documentation, and (ii) the name of + * Silicon Graphics may not be used in any advertising or + * publicity relating to the software without the specific, prior written + * permission of Silicon Graphics. + * + * THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF + * ANY KIND, + * EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY + * WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. + * + * IN NO EVENT SHALL SILICON GRAPHICS BE LIABLE FOR + * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND, + * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, + * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF + * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE + * OF THIS SOFTWARE. + */ + +#include +#include +#include +#include + +GLenum rgb, doubleBuffer; + +#include "tkmap.c" + +double plane[4] = { + 1.0, 0.0, -1.0, 0.0 +}; +float rotX = 5.0, rotY = -5.0, zTranslate = -65.0; +float fogDensity = 0.02; +GLint cubeList = 1; + +float scp[18][3] = { + { + 1.000000, 0.000000, 0.000000 + }, + { + 1.000000, 0.000000, 5.000000 + }, + { + 0.707107, 0.707107, 0.000000 + }, + { + 0.707107, 0.707107, 5.000000 + }, + { + 0.000000, 1.000000, 0.000000 + }, + { + 0.000000, 1.000000, 5.000000 + }, + { + -0.707107, 0.707107, 0.000000 + }, + { + -0.707107, 0.707107, 5.000000 + }, + { + -1.000000, 0.000000, 0.000000 + }, + { + -1.000000, 0.000000, 5.000000 + }, + { + -0.707107, -0.707107, 0.000000 + }, + { + -0.707107, -0.707107, 5.000000 + }, + { + 0.000000, -1.000000, 0.000000 + }, + { + 0.000000, -1.000000, 5.000000 + }, + { + 0.707107, -0.707107, 0.000000 + }, + { + 0.707107, -0.707107, 5.000000 + }, + { + 1.000000, 0.000000, 0.000000 + }, + { + 1.000000, 0.000000, 5.000000 + }, +}; + + +static void Build_lists(void) +{ + + glNewList(cubeList, GL_COMPILE); + glBegin(GL_TRIANGLE_STRIP); + glNormal3fv(scp[0]); glVertex3fv(scp[0]); + glNormal3fv(scp[0]); glVertex3fv(scp[1]); + glNormal3fv(scp[2]); glVertex3fv(scp[2]); + glNormal3fv(scp[2]); glVertex3fv(scp[3]); + glNormal3fv(scp[4]); glVertex3fv(scp[4]); + glNormal3fv(scp[4]); glVertex3fv(scp[5]); + glNormal3fv(scp[6]); glVertex3fv(scp[6]); + glNormal3fv(scp[6]); glVertex3fv(scp[7]); + glNormal3fv(scp[8]); glVertex3fv(scp[8]); + glNormal3fv(scp[8]); glVertex3fv(scp[9]); + glNormal3fv(scp[10]); glVertex3fv(scp[10]); + glNormal3fv(scp[10]); glVertex3fv(scp[11]); + glNormal3fv(scp[12]); glVertex3fv(scp[12]); + glNormal3fv(scp[12]); glVertex3fv(scp[13]); + glNormal3fv(scp[14]); glVertex3fv(scp[14]); + glNormal3fv(scp[14]); glVertex3fv(scp[15]); + glNormal3fv(scp[16]); glVertex3fv(scp[16]); + glNormal3fv(scp[16]); glVertex3fv(scp[17]); + glEnd(); + glEndList(); +} + +static void Init(void) +{ + static float ambient[] = {0.1, 0.1, 0.1, 1.0}; + static float diffuse[] = {1.0, 1.0, 1.0, 1.0}; + static float position[] = {90.0, 90.0, 0.0, 0.0}; + static float front_mat_shininess[] = {30.0}; + static float front_mat_specular[] = {0.0, 0.0, 0.0, 1.0}; + static float front_mat_diffuse[] = {0.0, 1.0, 0.0, 1.0}; + static float back_mat_shininess[] = {50.0}; + static float back_mat_specular[] = {0.0, 0.0, 1.0, 1.0}; + static float back_mat_diffuse[] = {1.0, 0.0, 0.0, 1.0}; + static float lmodel_ambient[] = {0.0, 0.0, 0.0, 1.0}; + static float fog_color[] = {0.8, 0.8, 0.8, 1.0}; + + glFrontFace(GL_CW); + + glEnable(GL_DEPTH_TEST); + + glLightfv(GL_LIGHT0, GL_AMBIENT, ambient); + glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse); + glLightfv(GL_LIGHT0, GL_POSITION, position); + glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient); + glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, GL_TRUE); + glEnable(GL_LIGHTING); + glEnable(GL_LIGHT0); + + glMaterialfv(GL_FRONT, GL_SHININESS, front_mat_shininess); + glMaterialfv(GL_FRONT, GL_SPECULAR, front_mat_specular); + glMaterialfv(GL_FRONT, GL_DIFFUSE, front_mat_diffuse); + glMaterialfv(GL_BACK, GL_SHININESS, back_mat_shininess); + glMaterialfv(GL_BACK, GL_SPECULAR, back_mat_specular); + glMaterialfv(GL_BACK, GL_DIFFUSE, back_mat_diffuse); + + glEnable(GL_FOG); + glFogi(GL_FOG_MODE, GL_EXP); + glFogf(GL_FOG_DENSITY, fogDensity); + if (rgb) { + glFogfv(GL_FOG_COLOR, fog_color); + glClearColor(0.8, 0.8, 0.8, 1.0); + } else { + glFogi(GL_FOG_INDEX, 1<<5); + SetFogRamp(5, 3); + glClearIndex(128); + } + + Build_lists(); +} + +static void Reshape(int width, int height) +{ + + glViewport(0, 0, (GLint)width, (GLint)height); + + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + gluPerspective(45.0, 1.0, 1.0, 200.0); + glMatrixMode(GL_MODELVIEW); +} + +static void Key2(int key, int x, int y) +{ + + switch (key) { + case GLUT_KEY_UP: + rotX -= 5; + break; + case GLUT_KEY_DOWN: + rotX += 5; + break; + case GLUT_KEY_LEFT: + rotY -= 5; + break; + case GLUT_KEY_RIGHT: + rotY += 5; + break; + default: + return; + } + + glutPostRedisplay(); +} + +static void Key(unsigned char key, int x, int y) +{ + + switch (key) { + case 27: + exit(1); + case 'D': + if (rgb) { + fogDensity *= 1.10; + glFogf(GL_FOG_DENSITY, fogDensity); + } + break; + case 'd': + if (rgb) { + fogDensity /= 1.10; + glFogf(GL_FOG_DENSITY, fogDensity); + } + break; + default: + return; + } + + glutPostRedisplay(); +} + +static void Draw(void) +{ + + glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); + + glPushMatrix(); + + glTranslatef(0, 0, zTranslate); + glRotatef(rotY, 0,1,0); + glRotatef(rotX, 1,0,0); + glScalef(1.0, 1.0, 10.0); + + glCallList(cubeList); + + glPopMatrix(); + + glFlush(); + + if (doubleBuffer) { + glutSwapBuffers(); + } +} + +static GLenum Args(int argc, char **argv) +{ + GLint i; + + rgb = GL_TRUE; + doubleBuffer = GL_FALSE; + + for (i = 1; i < argc; i++) { + if (strcmp(argv[i], "-ci") == 0) { + rgb = GL_FALSE; + } else if (strcmp(argv[i], "-rgb") == 0) { + rgb = GL_TRUE; + } else if (strcmp(argv[i], "-sb") == 0) { + doubleBuffer = GL_FALSE; + } else if (strcmp(argv[i], "-db") == 0) { + doubleBuffer = GL_TRUE; + } else { + printf("%s (Bad option).\n", argv[i]); + return GL_FALSE; + } + } + return GL_TRUE; +} + +int main(int argc, char **argv) +{ + GLenum type; + + glutInit(&argc, argv); + + if (Args(argc, argv) == GL_FALSE) { + exit(1); + } + + glutInitWindowPosition(0, 0); glutInitWindowSize( 300, 300); + + type = GLUT_DEPTH; + type |= (rgb) ? GLUT_RGB : GLUT_INDEX; + type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE; + glutInitDisplayMode(type); + + if (glutCreateWindow("Fog Test") == GL_FALSE) { + exit(1); + } + + InitMap(); + + Init(); + + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutSpecialFunc(Key2); + glutDisplayFunc(Draw); + glutMainLoop(); + return 0; +} -- cgit v1.2.3