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- /*
- * 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.
- */
-
- /* BEP: renamed "nearest" as "nnearest" to avoid math.h collision on AIX */
-
- #include <stdio.h>
- #include <string.h>
- #include <math.h>
- #include <stdlib.h>
- #include "gltk.h"
-
-
- #define FALSE 0
- #define TRUE 1
- #ifndef PI
- #define PI 3.14159265358979323846
- #endif
-
-
- GLenum doubleBuffer, directRender;
- int W = 400, H = 400;
-
- char *imageFileName = 0;
- TK_RGBImageRec *image;
-
- int numComponents;
-
- float *minFilter, *magFilter, *sWrapMode, *tWrapMode;
- float decal[] = {GL_DECAL};
- float modulate[] = {GL_MODULATE};
- float repeat[] = {GL_REPEAT};
- float clamp[] = {GL_CLAMP};
- float nnearest[] = {GL_NEAREST};
- float linear[] = {GL_LINEAR};
- float nearest_mipmap_nearest[] = {GL_NEAREST_MIPMAP_NEAREST};
- float nearest_mipmap_linear[] = {GL_NEAREST_MIPMAP_LINEAR};
- float linear_mipmap_nearest[] = {GL_LINEAR_MIPMAP_NEAREST};
- float linear_mipmap_linear[] = {GL_LINEAR_MIPMAP_LINEAR};
- GLint sphereMap[] = {GL_SPHERE_MAP};
-
- float xRotation = 0.0, yRotation = 0.0;
- float zTranslate = -4.0;
- GLenum autoRotate = TRUE;
- GLenum deepestColor = TK_GREEN;
- GLenum isLit = TRUE;
- GLenum isFogged = FALSE;
- float *textureEnvironment = modulate;
-
- struct MipMap {
- int width, height;
- unsigned char *data;
- };
-
- int cube, cage, cylinder, torus, genericObject;
-
- float c[6][4][4][3] = {
- {
- {
- {
- 1.0, 1.0, -1.0
- },
- {
- 0.0, 1.0, -1.0
- },
- {
- 0.0, 0.0, -1.0
- },
- {
- 1.0, 0.0, -1.0
- },
- },
- {
- {
- 0.0, 1.0, -1.0
- },
- {
- -1.0, 1.0, -1.0
- },
- {
- -1.0, 0.0, -1.0
- },
- {
- 0.0, 0.0, -1.0
- },
- },
- {
- {
- 0.0, 0.0, -1.0
- },
- {
- -1.0, 0.0, -1.0
- },
- {
- -1.0, -1.0, -1.0
- },
- {
- 0.0, -1.0, -1.0
- },
- },
- {
- {
- 1.0, 0.0, -1.0
- },
- {
- 0.0, 0.0, -1.0
- },
- {
- 0.0, -1.0, -1.0
- },
- {
- 1.0, -1.0, -1.0
- },
- },
- },
- {
- {
- {
- 1.0, 1.0, 1.0
- },
- {
- 1.0, 1.0, 0.0
- },
- {
- 1.0, 0.0, 0.0
- },
- {
- 1.0, 0.0, 1.0
- },
- },
- {
- {
- 1.0, 1.0, 0.0
- },
- {
- 1.0, 1.0, -1.0
- },
- {
- 1.0, 0.0, -1.0
- },
- {
- 1.0, 0.0, 0.0
- },
- },
- {
- {
- 1.0, 0.0, -1.0
- },
- {
- 1.0, -1.0, -1.0
- },
- {
- 1.0, -1.0, 0.0
- },
- {
- 1.0, 0.0, 0.0
- },
- },
- {
- {
- 1.0, 0.0, 0.0
- },
- {
- 1.0, -1.0, 0.0
- },
- {
- 1.0, -1.0, 1.0
- },
- {
- 1.0, 0.0, 1.0
- },
- },
- },
- {
- {
- {
- -1.0, 1.0, 1.0
- },
- {
- 0.0, 1.0, 1.0
- },
- {
- 0.0, 0.0, 1.0
- },
- {
- -1.0, 0.0, 1.0
- },
- },
- {
- {
- 0.0, 1.0, 1.0
- },
- {
- 1.0, 1.0, 1.0
- },
- {
- 1.0, 0.0, 1.0
- },
- {
- 0.0, 0.0, 1.0
- },
- },
- {
- {
- 1.0, 0.0, 1.0
- },
- {
- 1.0, -1.0, 1.0
- },
- {
- 0.0, -1.0, 1.0
- },
- {
- 0.0, 0.0, 1.0
- },
- },
- {
- {
- 0.0, -1.0, 1.0
- },
- {
- -1.0, -1.0, 1.0
- },
- {
- -1.0, 0.0, 1.0
- },
- {
- 0.0, 0.0, 1.0
- },
- },
- },
- {
- {
- {
- -1.0, 1.0, -1.0
- },
- {
- -1.0, 1.0, 0.0
- },
- {
- -1.0, 0.0, 0.0
- },
- {
- -1.0, 0.0, -1.0
- },
- },
- {
- {
- -1.0, 1.0, 0.0
- },
- {
- -1.0, 1.0, 1.0
- },
- {
- -1.0, 0.0, 1.0
- },
- {
- -1.0, 0.0, 0.0
- },
- },
- {
- {
- -1.0, 0.0, 1.0
- },
- {
- -1.0, -1.0, 1.0
- },
- {
- -1.0, -1.0, 0.0
- },
- {
- -1.0, 0.0, 0.0
- },
- },
- {
- {
- -1.0, -1.0, 0.0
- },
- {
- -1.0, -1.0, -1.0
- },
- {
- -1.0, 0.0, -1.0
- },
- {
- -1.0, 0.0, 0.0
- },
- },
- },
- {
- {
- {
- -1.0, 1.0, 1.0
- },
- {
- -1.0, 1.0, 0.0
- },
- {
- 0.0, 1.0, 0.0
- },
- {
- 0.0, 1.0, 1.0
- },
- },
- {
- {
- -1.0, 1.0, 0.0
- },
- {
- -1.0, 1.0, -1.0
- },
- {
- 0.0, 1.0, -1.0
- },
- {
- 0.0, 1.0, 0.0
- },
- },
- {
- {
- 0.0, 1.0, -1.0
- },
- {
- 1.0, 1.0, -1.0
- },
- {
- 1.0, 1.0, 0.0
- },
- {
- 0.0, 1.0, 0.0
- },
- },
- {
- {
- 1.0, 1.0, 0.0
- },
- {
- 1.0, 1.0, 1.0
- },
- {
- 0.0, 1.0, 1.0
- },
- {
- 0.0, 1.0, 0.0
- },
- },
- },
- {
- {
- {
- -1.0, -1.0, -1.0
- },
- {
- -1.0, -1.0, 0.0
- },
- {
- 0.0, -1.0, 0.0
- },
- {
- 0.0, -1.0, -1.0
- },
- },
- {
- {
- -1.0, -1.0, 0.0
- },
- {
- -1.0, -1.0, 1.0
- },
- {
- 0.0, -1.0, 1.0
- },
- {
- 0.0, -1.0, 0.0
- },
- },
- {
- {
- 0.0, -1.0, 1.0
- },
- {
- 1.0, -1.0, 1.0
- },
- {
- 1.0, -1.0, 0.0
- },
- {
- 0.0, -1.0, 0.0
- },
- },
- {
- {
- 1.0, -1.0, 0.0
- },
- {
- 1.0, -1.0, -1.0
- },
- {
- 0.0, -1.0, -1.0
- },
- {
- 0.0, -1.0, 0.0
- },
- },
- }
- };
-
- float n[6][3] = {
- {
- 0.0, 0.0, -1.0
- },
- {
- 1.0, 0.0, 0.0
- },
- {
- 0.0, 0.0, 1.0
- },
- {
- -1.0, 0.0, 0.0
- },
- {
- 0.0, 1.0, 0.0
- },
- {
- 0.0, -1.0, 0.0
- }
- };
-
- GLfloat identity[16] = {
- 1, 0, 0, 0,
- 0, 1, 0, 0,
- 0, 0, 1, 0,
- 0, 0, 0, 1,
- };
-
-
- void BuildCylinder(int numEdges)
- {
- int i, top = 1.0, bottom = -1.0;
- float x[100], y[100], angle;
-
- for (i = 0; i <= numEdges; i++) {
- angle = i * 2.0 * PI / numEdges;
- x[i] = cos(angle); /* was cosf() */
- y[i] = sin(angle); /* was sinf() */
- }
-
- glNewList(cylinder, GL_COMPILE);
- glBegin(GL_TRIANGLE_STRIP);
- for (i = 0; i <= numEdges; i++) {
- glNormal3f(x[i], y[i], 0.0);
- glVertex3f(x[i], y[i], bottom);
- glVertex3f(x[i], y[i], top);
- }
- glEnd();
- glBegin(GL_TRIANGLE_FAN);
- glNormal3f(0.0, 0.0, 1.0);
- glVertex3f(0.0, 0.0, top);
- for (i = 0; i <= numEdges; i++) {
- glVertex3f(x[i], -y[i], top);
- }
- glEnd();
- glBegin(GL_TRIANGLE_FAN);
- glNormal3f(0.0, 0.0, -1.0);
- glVertex3f(0.0, 0.0, bottom);
- for (i = 0; i <= numEdges; i++) {
- glVertex3f(x[i], y[i], bottom);
- }
- glEnd();
- glEndList();
- }
-
- void BuildTorus(float rc, int numc, float rt, int numt)
- {
- int i, j, k;
- double s, t;
- double x, y, z;
- double pi, twopi;
-
- pi = 3.14159265358979323846;
- twopi = 2.0 * pi;
-
- glNewList(torus, GL_COMPILE);
- for (i = 0; i < numc; i++) {
- glBegin(GL_QUAD_STRIP);
- for (j = 0; j <= numt; j++) {
- for (k = 0; k <= 1; k++) {
- s = (i + k) % numc + 0.5;
- t = j % numt;
-
- x = cos(t*twopi/numt) * cos(s*twopi/numc);
- y = sin(t*twopi/numt) * cos(s*twopi/numc);
- z = sin(s*twopi/numc);
- glNormal3f(x, y, z);
-
- x = (rt + rc * cos(s*twopi/numc)) * cos(t*twopi/numt);
- y = (rt + rc * cos(s*twopi/numc)) * sin(t*twopi/numt);
- z = rc * sin(s*twopi/numc);
- glVertex3f(x, y, z);
- }
- }
- glEnd();
- }
- glEndList();
- }
-
- void BuildCage(void)
- {
- int i;
- float inc;
- float right, left, top, bottom, front, back;
-
- front = 0.0;
- back = -8.0;
-
- left = -4.0;
- bottom = -4.0;
- right = 4.0;
- top = 4.0;
-
- inc = 2.0 * 4.0 * 0.1;
-
- glNewList(cage, GL_COMPILE);
- for (i = 0; i < 10; i++) {
-
- /*
- ** Back
- */
- glBegin(GL_LINES);
- glVertex3f(left+i*inc, top, back);
- glVertex3f(left+i*inc, bottom, back);
- glEnd();
- glBegin(GL_LINES);
- glVertex3f(right, bottom+i*inc, back);
- glVertex3f(left, bottom+i*inc, back);
- glEnd();
-
- /*
- ** Front
- */
- glBegin(GL_LINES);
- glVertex3f(left+i*inc, top, front);
- glVertex3f(left+i*inc, bottom, front);
- glEnd();
- glBegin(GL_LINES);
- glVertex3f(right, bottom+i*inc, front);
- glVertex3f(left, bottom+i*inc, front);
- glEnd();
-
- /*
- ** Left
- */
- glBegin(GL_LINES);
- glVertex3f(left, bottom+i*inc, front);
- glVertex3f(left, bottom+i*inc, back);
- glEnd();
- glBegin(GL_LINES);
- glVertex3f(left, top, back+i*inc);
- glVertex3f(left, bottom, back+i*inc);
- glEnd();
-
- /*
- ** Right
- */
- glBegin(GL_LINES);
- glVertex3f(right, top-i*inc, front);
- glVertex3f(right, top-i*inc, back);
- glEnd();
- glBegin(GL_LINES);
- glVertex3f(right, top, back+i*inc);
- glVertex3f(right, bottom, back+i*inc);
- glEnd();
-
- /*
- ** Top
- */
- glBegin(GL_LINES);
- glVertex3f(left+i*inc, top, front);
- glVertex3f(left+i*inc, top, back);
- glEnd();
- glBegin(GL_LINES);
- glVertex3f(right, top, back+i*inc);
- glVertex3f(left, top, back+i*inc);
- glEnd();
-
- /*
- ** Bottom
- */
- glBegin(GL_LINES);
- glVertex3f(right-i*inc, bottom, front);
- glVertex3f(right-i*inc, bottom, back);
- glEnd();
- glBegin(GL_LINES);
- glVertex3f(right, bottom, back+i*inc);
- glVertex3f(left, bottom, back+i*inc);
- glEnd();
- }
- glEndList();
- }
-
- void BuildCube(void)
- {
- int i, j;
-
- glNewList(cube, GL_COMPILE);
- for (i = 0; i < 6; i++) {
- for (j = 0; j < 4; j++) {
- glNormal3fv(n[i]);
- glBegin(GL_POLYGON);
- glVertex3fv(c[i][j][0]);
- glVertex3fv(c[i][j][1]);
- glVertex3fv(c[i][j][2]);
- glVertex3fv(c[i][j][3]);
- glEnd();
- }
- }
- glEndList();
- }
-
- void BuildLists(void)
- {
-
- cube = glGenLists(1);
- BuildCube();
-
- cage = glGenLists(2);
- BuildCage();
-
- cylinder = glGenLists(3);
- BuildCylinder(60);
-
- torus = glGenLists(4);
- BuildTorus(0.65, 20, .85, 65);
-
- genericObject = torus;
- }
-
- void SetDeepestColor(void)
- {
- GLint redBits, greenBits, blueBits;
-
- glGetIntegerv(GL_RED_BITS, &redBits);
- glGetIntegerv(GL_GREEN_BITS, &greenBits);
- glGetIntegerv(GL_BLUE_BITS, &blueBits);
-
- deepestColor = (redBits >= greenBits) ? TK_RED : TK_GREEN;
- deepestColor = (deepestColor >= blueBits) ? deepestColor : TK_BLUE;
- }
-
- void SetDefaultSettings(void)
- {
-
- magFilter = nnearest;
- minFilter = nnearest;
- sWrapMode = repeat;
- tWrapMode = repeat;
- textureEnvironment = modulate;
- autoRotate = TRUE;
- }
-
- unsigned char *AlphaPadImage(int bufSize, unsigned char *inData, int alpha)
- {
- unsigned char *outData, *out_ptr, *in_ptr;
- int i;
-
- outData = (unsigned char *) malloc(bufSize * 4);
- out_ptr = outData;
- in_ptr = inData;
-
- for (i = 0; i < bufSize; i++) {
- *out_ptr++ = *in_ptr++;
- *out_ptr++ = *in_ptr++;
- *out_ptr++ = *in_ptr++;
- *out_ptr++ = alpha;
- }
-
- free (inData);
- return outData;
- }
-
- void Init(void)
- {
- float ambient[] = {0.0, 0.0, 0.0, 1.0};
- float diffuse[] = {0.0, 1.0, 0.0, 1.0};
- float specular[] = {1.0, 1.0, 1.0, 1.0};
- float position[] = {2.0, 2.0, 0.0, 1.0};
- float fog_color[] = {0.0, 0.0, 0.0, 1.0};
- float mat_ambient[] = {0.0, 0.0, 0.0, 1.0};
- float mat_shininess[] = {90.0};
- float mat_specular[] = {1.0, 1.0, 1.0, 1.0};
- float mat_diffuse[] = {1.0, 1.0, 1.0, 1.0};
- float lmodel_ambient[] = {0.0, 0.0, 0.0, 1.0};
- float lmodel_twoside[] = {GL_TRUE};
-
- SetDeepestColor();
- SetDefaultSettings();
-
- if (numComponents == 4) {
- image = tkRGBImageLoad(imageFileName);
- image->data = AlphaPadImage(image->sizeX*image->sizeY,
- image->data, 128);
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- gluBuild2DMipmaps(GL_TEXTURE_2D, numComponents,
- image->sizeX, image->sizeY,
- GL_RGBA, GL_UNSIGNED_BYTE, image->data);
- } else {
- image = tkRGBImageLoad(imageFileName);
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- gluBuild2DMipmaps(GL_TEXTURE_2D, numComponents,
- image->sizeX, image->sizeY,
- GL_RGB, GL_UNSIGNED_BYTE, image->data);
- }
-
- glFogf(GL_FOG_DENSITY, 0.125);
- glFogi(GL_FOG_MODE, GL_LINEAR);
- glFogf(GL_FOG_START, 4.0);
- glFogf(GL_FOG_END, 9.0);
- glFogfv(GL_FOG_COLOR, fog_color);
-
- glLightfv(GL_LIGHT0, GL_AMBIENT, ambient);
- glLightfv(GL_LIGHT0, GL_DIFFUSE, diffuse);
- glLightfv(GL_LIGHT0, GL_SPECULAR, specular);
- glLightfv(GL_LIGHT0, GL_POSITION, position);
-
- glMaterialfv(GL_FRONT_AND_BACK, GL_SHININESS, mat_shininess);
- glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, mat_specular);
- glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, mat_diffuse);
- glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mat_ambient);
-
- glLightModelfv(GL_LIGHT_MODEL_AMBIENT, lmodel_ambient);
- glLightModelfv(GL_LIGHT_MODEL_TWO_SIDE, lmodel_twoside);
- glShadeModel(GL_SMOOTH);
-
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
-
- glClearColor(0.0, 0.0, 0.0, 0.0);
- glViewport(0, 0, W, H);
- glEnable(GL_DEPTH_TEST);
-
- glFrontFace(GL_CW);
- glEnable(GL_CULL_FACE);
- glCullFace(GL_BACK);
-
- glEnable(GL_TEXTURE_2D);
- glTexGeniv(GL_S, GL_TEXTURE_GEN_MODE, sphereMap);
- glTexGeniv(GL_T, GL_TEXTURE_GEN_MODE, sphereMap);
- glEnable(GL_TEXTURE_GEN_S);
- glEnable(GL_TEXTURE_GEN_T);
-
- glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter);
- glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter);
- glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, sWrapMode);
- glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, tWrapMode);
-
- glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, textureEnvironment);
-
- BuildLists();
- }
-
- void ReInit(void)
- {
-
- if (genericObject == torus) {
- glEnable(GL_DEPTH_TEST);
- } else {
- glDisable(GL_DEPTH_TEST);
- }
- if (isFogged) {
- textureEnvironment = modulate;
- }
-
- glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, magFilter);
- glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, minFilter);
- glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, textureEnvironment);
- }
-
- void Draw(void)
- {
-
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- glFrustum(-0.2, 0.2, -0.2, 0.2, 0.15, 9.0);
- glMatrixMode(GL_MODELVIEW);
-
- glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
- if (isFogged) {
- glEnable(GL_FOG);
- glColor3fv(tkRGBMap[deepestColor]);
- } else {
- glColor3fv(tkRGBMap[TK_WHITE]);
- }
- glDisable(GL_LIGHTING);
- glDisable(GL_LIGHT0);
- glDisable(GL_TEXTURE_2D);
- glCallList(cage);
-
- glPushMatrix();
- glTranslatef(0.0, 0.0, zTranslate);
- glRotatef(xRotation, 1, 0, 0);
- glRotatef(yRotation, 0, 1, 0);
-
- if (isLit == TRUE) {
- glEnable(GL_LIGHTING);
- glEnable(GL_LIGHT0);
- }
-
- glEnable(GL_TEXTURE_2D);
- if (isFogged) {
- glDisable(GL_FOG);
- }
- glPolygonMode(GL_FRONT, GL_FILL);
- glColor3fv(tkRGBMap[deepestColor]);
- glCallList(genericObject);
-
- glPopMatrix();
- glFlush();
-
- if (autoRotate) {
- xRotation += .75;
- yRotation += .375;
- }
- tkSwapBuffers();
- }
-
- void Reshape(int width, int height)
- {
-
- W = width;
- H = height;
- ReInit();
- glViewport( 0, 0, width, height ); /*new*/
- }
-
- GLenum Key(int key, GLenum mask)
- {
-
- switch (key) {
- case TK_ESCAPE:
- free(image->data);
- tkQuit();
-
- case TK_LEFT:
- yRotation -= 0.5;
- autoRotate = FALSE;
- ReInit();
- break;
- case TK_RIGHT:
- yRotation += 0.5;
- autoRotate = FALSE;
- ReInit();
- break;
- case TK_UP:
- xRotation -= 0.5;
- autoRotate = FALSE;
- ReInit();
- break;
- case TK_DOWN:
- xRotation += 0.5;
- autoRotate = FALSE;
- ReInit();
- break;
- case TK_a:
- autoRotate = !autoRotate;
- ReInit();
- break;
- case TK_c:
- genericObject = (genericObject == cube) ? cylinder : cube;
- ReInit();
- break;
- case TK_d:
- textureEnvironment = decal;
- ReInit();
- break;
- case TK_m:
- textureEnvironment = modulate;
- ReInit();
- break;
- case TK_l:
- isLit = !isLit;
- ReInit();
- break;
- case TK_f:
- isFogged = !isFogged;
- ReInit();
- break;
- case TK_t:
- genericObject = torus;
- ReInit();
- break;
- case TK_0:
- magFilter = nnearest;
- ReInit();
- break;
- case TK_1:
- magFilter = linear;
- ReInit();
- break;
- case TK_2:
- minFilter = nnearest;
- ReInit();
- break;
- case TK_3:
- minFilter = linear;
- ReInit();
- break;
- case TK_4:
- minFilter = nearest_mipmap_nearest;
- ReInit();
- break;
- case TK_5:
- minFilter = nearest_mipmap_linear;
- ReInit();
- break;
- case TK_6:
- minFilter = linear_mipmap_nearest;
- ReInit();
- break;
- case TK_7:
- minFilter = linear_mipmap_linear;
- ReInit();
- break;
-
- default:
- return GL_FALSE;
- }
- return GL_TRUE;
- }
-
- GLenum Args(int argc, char **argv)
- {
- GLint i;
-
- doubleBuffer = GL_FALSE;
- directRender = GL_TRUE;
- numComponents = 4;
-
- for (i = 1; i < argc; i++) {
- if (strcmp(argv[i], "-sb") == 0) {
- doubleBuffer = GL_FALSE;
- } else if (strcmp(argv[i], "-db") == 0) {
- doubleBuffer = GL_TRUE;
- } else if (strcmp(argv[i], "-dr") == 0) {
- directRender = GL_TRUE;
- } else if (strcmp(argv[i], "-ir") == 0) {
- directRender = GL_FALSE;
- } else if (strcmp(argv[i], "-f") == 0) {
- if (i+1 >= argc || argv[i+1][0] == '-') {
- printf("-f (No file name).\n");
- return GL_FALSE;
- } else {
- imageFileName = argv[++i];
- }
- } else if (strcmp(argv[i], "-4") == 0) {
- numComponents = 4;
- } else if (strcmp(argv[i], "-3") == 0) {
- numComponents = 3;
- } else {
- printf("%s (Bad option).\n", argv[i]);
- return GL_FALSE;
- }
- }
- return GL_TRUE;
- }
-
- void main(int argc, char **argv)
- {
- GLenum type;
-
- if (Args(argc, argv) == GL_FALSE) {
- tkQuit();
- }
-
- if (imageFileName == 0) {
- printf("No image file.\n");
- tkQuit();
- }
-
- tkInitPosition(0, 0, W, H);
-
- type = TK_RGB | TK_DEPTH;
- type |= (doubleBuffer) ? TK_DOUBLE : TK_SINGLE;
- type |= (directRender) ? TK_DIRECT : TK_INDIRECT;
- tkInitDisplayMode(type);
-
- if (tkInitWindow("Texture Test") == GL_FALSE) {
- tkQuit();
- }
-
- Init();
-
- tkExposeFunc(Reshape);
- tkReshapeFunc(Reshape);
- tkKeyDownFunc(Key);
- tkIdleFunc(Draw);
-
- tkExec();
- }
-