Initial revision

1 files changed, 311 insertions, 0 deletions

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 <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <GL/glut.h>
+
+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;
+}