| /* |
| * 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 <math.h> |
| #include <GL/glut.h> |
| |
| #ifndef PI |
| #define PI 3.14159265358979323846 |
| #endif |
| |
| #define GETCOORD(frame, x, y) (&(theMesh.coords[frame*theMesh.numCoords+(x)+(y)*(theMesh.widthX+1)])) |
| #define GETFACET(frame, x, y) (&(theMesh.facets[frame*theMesh.numFacets+(x)+(y)*theMesh.widthX])) |
| |
| |
| GLenum rgb, doubleBuffer; |
| |
| #include "tkmap.c" |
| |
| GLint colorIndexes1[3]; |
| GLint colorIndexes2[3]; |
| GLenum clearMask = GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT; |
| |
| GLenum smooth = GL_FALSE; |
| GLenum lighting = GL_TRUE; |
| GLenum depth = GL_TRUE; |
| GLenum stepMode = GL_FALSE; |
| GLenum spinMode = GL_FALSE; |
| GLint contouring = 0; |
| |
| GLint widthX, widthY; |
| GLint checkerSize; |
| float height; |
| |
| GLint frames, curFrame = 0, nextFrame = 0; |
| |
| struct facet { |
| float color[3]; |
| float normal[3]; |
| }; |
| struct coord { |
| float vertex[3]; |
| float normal[3]; |
| }; |
| struct mesh { |
| GLint widthX, widthY; |
| GLint numFacets; |
| GLint numCoords; |
| GLint frames; |
| struct coord *coords; |
| struct facet *facets; |
| } theMesh; |
| |
| GLubyte contourTexture1[] = { |
| 255, 255, 255, 255, |
| 255, 255, 255, 255, |
| 255, 255, 255, 255, |
| 127, 127, 127, 127, |
| }; |
| GLubyte contourTexture2[] = { |
| 255, 255, 255, 255, |
| 255, 127, 127, 127, |
| 255, 127, 127, 127, |
| 255, 127, 127, 127, |
| }; |
| |
| #if !defined(GLUTCALLBACK) |
| #define GLUTCALLBACK |
| #endif |
| |
| |
| void GLUTCALLBACK glut_post_redisplay_p(void) |
| { |
| static double t0 = -1.; |
| double t, dt; |
| t = glutGet(GLUT_ELAPSED_TIME) / 1000.; |
| if (t0 < 0.) |
| t0 = t; |
| dt = t - t0; |
| |
| if (dt < 1./30.) |
| return; |
| |
| t0 = t; |
| |
| glutPostRedisplay(); |
| } |
| |
| static void Animate(void) |
| { |
| struct coord *coord; |
| struct facet *facet; |
| float *lastColor; |
| float *thisColor; |
| GLint i, j; |
| |
| glClear(clearMask); |
| |
| if (nextFrame || !stepMode) { |
| curFrame++; |
| } |
| if (curFrame >= theMesh.frames) { |
| curFrame = 0; |
| } |
| |
| if ((nextFrame || !stepMode) && spinMode) { |
| glRotatef(5.0, 0.0, 0.0, 1.0); |
| } |
| nextFrame = 0; |
| |
| for (i = 0; i < theMesh.widthX; i++) { |
| glBegin(GL_QUAD_STRIP); |
| lastColor = NULL; |
| for (j = 0; j < theMesh.widthY; j++) { |
| facet = GETFACET(curFrame, i, j); |
| if (!smooth && lighting) { |
| glNormal3fv(facet->normal); |
| } |
| if (lighting) { |
| if (rgb) { |
| thisColor = facet->color; |
| glColor3fv(facet->color); |
| } else { |
| thisColor = facet->color; |
| glMaterialfv(GL_FRONT_AND_BACK, GL_COLOR_INDEXES, |
| facet->color); |
| } |
| } else { |
| if (rgb) { |
| thisColor = facet->color; |
| glColor3fv(facet->color); |
| } else { |
| thisColor = facet->color; |
| glIndexf(facet->color[1]); |
| } |
| } |
| |
| if (!lastColor || (thisColor[0] != lastColor[0] && smooth)) { |
| if (lastColor) { |
| glEnd(); |
| glBegin(GL_QUAD_STRIP); |
| } |
| coord = GETCOORD(curFrame, i, j); |
| if (smooth && lighting) { |
| glNormal3fv(coord->normal); |
| } |
| glVertex3fv(coord->vertex); |
| |
| coord = GETCOORD(curFrame, i+1, j); |
| if (smooth && lighting) { |
| glNormal3fv(coord->normal); |
| } |
| glVertex3fv(coord->vertex); |
| } |
| |
| coord = GETCOORD(curFrame, i, j+1); |
| if (smooth && lighting) { |
| glNormal3fv(coord->normal); |
| } |
| glVertex3fv(coord->vertex); |
| |
| coord = GETCOORD(curFrame, i+1, j+1); |
| if (smooth && lighting) { |
| glNormal3fv(coord->normal); |
| } |
| glVertex3fv(coord->vertex); |
| |
| lastColor = thisColor; |
| } |
| glEnd(); |
| } |
| |
| glFlush(); |
| if (doubleBuffer) { |
| glutSwapBuffers(); |
| } |
| } |
| |
| static void SetColorMap(void) |
| { |
| static float green[3] = {0.2, 1.0, 0.2}; |
| static float red[3] = {1.0, 0.2, 0.2}; |
| float *color = 0, percent; |
| GLint *indexes = 0, entries, i, j; |
| |
| entries = glutGet(GLUT_WINDOW_COLORMAP_SIZE); |
| |
| colorIndexes1[0] = 1; |
| colorIndexes1[1] = 1 + (GLint)((entries - 1) * 0.3); |
| colorIndexes1[2] = (GLint)((entries - 1) * 0.5); |
| colorIndexes2[0] = 1 + (GLint)((entries - 1) * 0.5); |
| colorIndexes2[1] = 1 + (GLint)((entries - 1) * 0.8); |
| colorIndexes2[2] = entries - 1; |
| |
| for (i = 0; i < 2; i++) { |
| switch (i) { |
| case 0: |
| color = green; |
| indexes = colorIndexes1; |
| break; |
| case 1: |
| color = red; |
| indexes = colorIndexes2; |
| break; |
| } |
| |
| for (j = indexes[0]; j < indexes[1]; j++) { |
| percent = 0.2 + 0.8 * (j - indexes[0]) / |
| (float)(indexes[1] - indexes[0]); |
| glutSetColor(j, percent*color[0], percent*color[1], |
| percent*color[2]); |
| } |
| for (j=indexes[1]; j<=indexes[2]; j++) { |
| percent = (j - indexes[1]) / (float)(indexes[2] - indexes[1]); |
| glutSetColor(j, percent*(1-color[0])+color[0], |
| percent*(1-color[1])+color[1], |
| percent*(1-color[2])+color[2]); |
| } |
| } |
| } |
| |
| static void InitMesh(void) |
| { |
| struct coord *coord; |
| struct facet *facet; |
| float dp1[3], dp2[3]; |
| float *pt1, *pt2, *pt3; |
| float angle, d, x, y; |
| GLint numFacets, numCoords, frameNum, i, j; |
| |
| theMesh.widthX = widthX; |
| theMesh.widthY = widthY; |
| theMesh.frames = frames; |
| |
| numFacets = widthX * widthY; |
| numCoords = (widthX + 1) * (widthY + 1); |
| |
| theMesh.numCoords = numCoords; |
| theMesh.numFacets = numFacets; |
| |
| theMesh.coords = (struct coord *)malloc(frames*numCoords* |
| sizeof(struct coord)); |
| theMesh.facets = (struct facet *)malloc(frames*numFacets* |
| sizeof(struct facet)); |
| if (theMesh.coords == NULL || theMesh.facets == NULL) { |
| printf("Out of memory.\n"); |
| exit(1); |
| } |
| |
| for (frameNum = 0; frameNum < frames; frameNum++) { |
| for (i = 0; i <= widthX; i++) { |
| x = i / (float)widthX; |
| for (j = 0; j <= widthY; j++) { |
| y = j / (float)widthY; |
| |
| d = sqrt(x*x+y*y); |
| if (d == 0.0) { |
| d = 0.0001; |
| } |
| angle = 2 * PI * d + (2 * PI / frames * frameNum); |
| |
| coord = GETCOORD(frameNum, i, j); |
| |
| coord->vertex[0] = x - 0.5; |
| coord->vertex[1] = y - 0.5; |
| coord->vertex[2] = (height - height * d) * cos(angle); |
| |
| coord->normal[0] = -(height / d) * x * ((1 - d) * 2 * PI * |
| sin(angle) + cos(angle)); |
| coord->normal[1] = -(height / d) * y * ((1 - d) * 2 * PI * |
| sin(angle) + cos(angle)); |
| coord->normal[2] = -1; |
| |
| d = 1.0 / sqrt(coord->normal[0]*coord->normal[0]+ |
| coord->normal[1]*coord->normal[1]+1); |
| coord->normal[0] *= d; |
| coord->normal[1] *= d; |
| coord->normal[2] *= d; |
| } |
| } |
| for (i = 0; i < widthX; i++) { |
| for (j = 0; j < widthY; j++) { |
| facet = GETFACET(frameNum, i, j); |
| if (((i/checkerSize)%2)^(j/checkerSize)%2) { |
| if (rgb) { |
| facet->color[0] = 1.0; |
| facet->color[1] = 0.2; |
| facet->color[2] = 0.2; |
| } else { |
| facet->color[0] = colorIndexes1[0]; |
| facet->color[1] = colorIndexes1[1]; |
| facet->color[2] = colorIndexes1[2]; |
| } |
| } else { |
| if (rgb) { |
| facet->color[0] = 0.2; |
| facet->color[1] = 1.0; |
| facet->color[2] = 0.2; |
| } else { |
| facet->color[0] = colorIndexes2[0]; |
| facet->color[1] = colorIndexes2[1]; |
| facet->color[2] = colorIndexes2[2]; |
| } |
| } |
| pt1 = GETCOORD(frameNum, i, j)->vertex; |
| pt2 = GETCOORD(frameNum, i, j+1)->vertex; |
| pt3 = GETCOORD(frameNum, i+1, j+1)->vertex; |
| |
| dp1[0] = pt2[0] - pt1[0]; |
| dp1[1] = pt2[1] - pt1[1]; |
| dp1[2] = pt2[2] - pt1[2]; |
| |
| dp2[0] = pt3[0] - pt2[0]; |
| dp2[1] = pt3[1] - pt2[1]; |
| dp2[2] = pt3[2] - pt2[2]; |
| |
| facet->normal[0] = dp1[1] * dp2[2] - dp1[2] * dp2[1]; |
| facet->normal[1] = dp1[2] * dp2[0] - dp1[0] * dp2[2]; |
| facet->normal[2] = dp1[0] * dp2[1] - dp1[1] * dp2[0]; |
| |
| d = 1.0 / sqrt(facet->normal[0]*facet->normal[0]+ |
| facet->normal[1]*facet->normal[1]+ |
| facet->normal[2]*facet->normal[2]); |
| |
| facet->normal[0] *= d; |
| facet->normal[1] *= d; |
| facet->normal[2] *= d; |
| } |
| } |
| } |
| } |
| |
| static void InitMaterials(void) |
| { |
| static float ambient[] = {0.1, 0.1, 0.1, 1.0}; |
| static float diffuse[] = {0.5, 1.0, 1.0, 1.0}; |
| static float position[] = {90.0, 90.0, 150.0, 0.0}; |
| static float front_mat_shininess[] = {60.0}; |
| static float front_mat_specular[] = {0.2, 0.2, 0.2, 1.0}; |
| static float front_mat_diffuse[] = {0.5, 0.28, 0.38, 1.0}; |
| static float back_mat_shininess[] = {60.0}; |
| static float back_mat_specular[] = {0.5, 0.5, 0.2, 1.0}; |
| static float back_mat_diffuse[] = {1.0, 1.0, 0.2, 1.0}; |
| static float lmodel_ambient[] = {1.0, 1.0, 1.0, 1.0}; |
| static float lmodel_twoside[] = {GL_TRUE}; |
| |
| glMatrixMode(GL_PROJECTION); |
| gluPerspective(90.0, 1.0, 0.5, 10.0); |
| |
| 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); |
| glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside); |
| 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); |
| if (rgb) { |
| glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE); |
| } |
| |
| if (rgb) { |
| glEnable(GL_COLOR_MATERIAL); |
| } else { |
| SetColorMap(); |
| } |
| } |
| |
| static void InitTexture(void) |
| { |
| |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); |
| } |
| |
| static void Init(void) |
| { |
| |
| glClearColor(0.0, 0.0, 0.0, 0.0); |
| |
| glShadeModel(GL_FLAT); |
| |
| glFrontFace(GL_CW); |
| |
| glEnable(GL_DEPTH_TEST); |
| |
| InitMaterials(); |
| InitTexture(); |
| InitMesh(); |
| |
| glMatrixMode(GL_MODELVIEW); |
| glTranslatef(0.0, 0.4, -1.8); |
| glScalef(2.0, 2.0, 2.0); |
| glRotatef(-35.0, 1.0, 0.0, 0.0); |
| glRotatef(35.0, 0.0, 0.0, 1.0); |
| } |
| |
| static void Reshape(int width, int height) |
| { |
| |
| glViewport(0, 0, (GLint)width, (GLint)height); |
| } |
| |
| static void Key(unsigned char key, int x, int y) |
| { |
| |
| switch (key) { |
| case 27: |
| exit(1); |
| case 'c': |
| contouring++; |
| if (contouring == 1) { |
| static GLfloat map[4] = {0, 0, 20, 0}; |
| |
| glTexImage2D(GL_TEXTURE_2D, 0, 3, 4, 4, 0, GL_LUMINANCE, |
| GL_UNSIGNED_BYTE, (GLvoid *)contourTexture1); |
| glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR); |
| glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_OBJECT_LINEAR); |
| glTexGenfv(GL_S, GL_OBJECT_PLANE, map); |
| glTexGenfv(GL_T, GL_OBJECT_PLANE, map); |
| glEnable(GL_TEXTURE_2D); |
| glEnable(GL_TEXTURE_GEN_S); |
| glEnable(GL_TEXTURE_GEN_T); |
| } else if (contouring == 2) { |
| static GLfloat map[4] = {0, 0, 20, 0}; |
| |
| glTexGeni(GL_S, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR); |
| glTexGeni(GL_T, GL_TEXTURE_GEN_MODE, GL_EYE_LINEAR); |
| glPushMatrix(); |
| glMatrixMode(GL_MODELVIEW); |
| glLoadIdentity(); |
| glTexGenfv(GL_S, GL_EYE_PLANE, map); |
| glTexGenfv(GL_T, GL_EYE_PLANE, map); |
| glPopMatrix(); |
| } else { |
| contouring = 0; |
| glDisable(GL_TEXTURE_GEN_S); |
| glDisable(GL_TEXTURE_GEN_T); |
| glDisable(GL_TEXTURE_2D); |
| } |
| break; |
| case 's': |
| smooth = !smooth; |
| if (smooth) { |
| glShadeModel(GL_SMOOTH); |
| } else { |
| glShadeModel(GL_FLAT); |
| } |
| break; |
| case 'l': |
| lighting = !lighting; |
| if (lighting) { |
| glEnable(GL_LIGHTING); |
| glEnable(GL_LIGHT0); |
| if (rgb) { |
| glEnable(GL_COLOR_MATERIAL); |
| } |
| } else { |
| glDisable(GL_LIGHTING); |
| glDisable(GL_LIGHT0); |
| if (rgb) { |
| glDisable(GL_COLOR_MATERIAL); |
| } |
| } |
| break; |
| case 'd': |
| depth = !depth; |
| if (depth) { |
| glEnable(GL_DEPTH_TEST); |
| clearMask |= GL_DEPTH_BUFFER_BIT; |
| } else { |
| glDisable(GL_DEPTH_TEST); |
| clearMask &= ~GL_DEPTH_BUFFER_BIT; |
| } |
| break; |
| case 32: |
| stepMode = !stepMode; |
| if (stepMode) { |
| glutIdleFunc(0); |
| } else { |
| glutIdleFunc(glut_post_redisplay_p); |
| } |
| break; |
| case 'n': |
| if (stepMode) { |
| nextFrame = 1; |
| } |
| break; |
| case 'a': |
| spinMode = !spinMode; |
| break; |
| default: |
| return; |
| } |
| glutPostRedisplay(); |
| } |
| |
| static GLenum Args(int argc, char **argv) |
| { |
| GLint i; |
| |
| rgb = GL_TRUE; |
| doubleBuffer = GL_TRUE; |
| frames = 10; |
| widthX = 10; |
| widthY = 10; |
| checkerSize = 2; |
| height = 0.2; |
| |
| 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 if (strcmp(argv[i], "-grid") == 0) { |
| if (i+2 >= argc || argv[i+1][0] == '-' || argv[i+2][0] == '-') { |
| printf("-grid (No numbers).\n"); |
| return GL_FALSE; |
| } else { |
| widthX = atoi(argv[++i]); |
| widthY = atoi(argv[++i]); |
| } |
| } else if (strcmp(argv[i], "-size") == 0) { |
| if (i+1 >= argc || argv[i+1][0] == '-') { |
| printf("-checker (No number).\n"); |
| return GL_FALSE; |
| } else { |
| checkerSize = atoi(argv[++i]); |
| } |
| } else if (strcmp(argv[i], "-wave") == 0) { |
| if (i+1 >= argc || argv[i+1][0] == '-') { |
| printf("-wave (No number).\n"); |
| return GL_FALSE; |
| } else { |
| height = atof(argv[++i]); |
| } |
| } else if (strcmp(argv[i], "-frames") == 0) { |
| if (i+1 >= argc || argv[i+1][0] == '-') { |
| printf("-frames (No number).\n"); |
| return GL_FALSE; |
| } else { |
| frames = atoi(argv[++i]); |
| } |
| } 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("Wave Demo") == GL_FALSE) { |
| exit(1); |
| } |
| |
| InitMap(); |
| |
| Init(); |
| |
| glutReshapeFunc(Reshape); |
| glutKeyboardFunc(Key); |
| glutDisplayFunc(Animate); |
| glutIdleFunc(glut_post_redisplay_p); |
| glutMainLoop(); |
| return 0; |
| } |
