/* * Copyright (c) 1993-1997, Silicon Graphics, Inc. * ALL RIGHTS RESERVED * Permission to use, copy, modify, and distribute this software for * any purpose and without fee is hereby granted, provided that the above * copyright notice appear in all copies and that both the copyright notice * and this permission notice appear in supporting documentation, and that * the name of Silicon Graphics, Inc. not be used in advertising * or publicity pertaining to distribution of the software without specific, * written prior permission. * * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "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, INC. BE LIABLE TO YOU OR ANYONE ELSE FOR ANY DIRECT, * SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY * KIND, OR ANY DAMAGES WHATSOEVER, INCLUDING WITHOUT LIMITATION, * LOSS OF PROFIT, LOSS OF USE, SAVINGS OR REVENUE, OR THE CLAIMS OF * THIRD PARTIES, WHETHER OR NOT SILICON GRAPHICS, INC. HAS BEEN * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE. * * US Government Users Restricted Rights * Use, duplication, or disclosure by the Government is subject to * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph * (c)(1)(ii) of the Rights in Technical Data and Computer Software * clause at DFARS 252.227-7013 and/or in similar or successor * clauses in the FAR or the DOD or NASA FAR Supplement. * Unpublished-- rights reserved under the copyright laws of the * United States. Contractor/manufacturer is Silicon Graphics, * Inc., 2011 N. Shoreline Blvd., Mountain View, CA 94039-7311. * * OpenGL(R) is a registered trademark of Silicon Graphics, Inc. */ /* checker.c * This program texture maps a checkerboard image onto * two rectangles. * * If running this program on OpenGL 1.0, texture objects are * not used. */ #include #include #include #include /******************************************************************/ /* #define USE_VERSION_1_1 0 */ #ifndef USE_VERSION_1_1 #define USE_VERSION_1_1 1 #endif /* 0 through 7 work on Mac OSX with and without Regal emulation */ /* 0 through 3 work on Nvidia Win7 without Regal emulation */ /* 0 through 7 work on Nvidia Win7 with Regal emulation */ #define USE_UNIT (GL_TEXTURE0+7) /******************************************************************/ #if USE_VERSION_1_1 static GLuint texName; #endif /* Create checkerboard texture */ #define checkImageWidth 64 #define checkImageHeight 64 static GLubyte checkImage[checkImageHeight][checkImageWidth][4]; void makeCheckImage(void) { int i, j, c; for (i = 0; i < checkImageHeight; i++) { for (j = 0; j < checkImageWidth; j++) { c = ((((i&0x8)==0)^((j&0x8))==0))*255; checkImage[i][j][0] = (GLubyte) c; checkImage[i][j][1] = (GLubyte) c; checkImage[i][j][2] = (GLubyte) c; checkImage[i][j][3] = (GLubyte) 255; } } } void dreamTorusInit(void) { /* Report the number of available texture units */ GLint textureUnits,vertexUnits,fragmentUnits,combinedUnits; GLint vertexAttribs; glGetIntegerv(GL_MAX_TEXTURE_UNITS, &textureUnits); glGetIntegerv(GL_MAX_TEXTURE_IMAGE_UNITS, &fragmentUnits); glGetIntegerv(GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS, &vertexUnits); glGetIntegerv(GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS,&combinedUnits); printf("%d texture units, %d fragment, %d vertex and %d combined texture units.\n",textureUnits,fragmentUnits,vertexUnits,combinedUnits); glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, &vertexAttribs); printf("%u vertex attributes.\n",vertexAttribs); /* Initialize OpenGL */ glClearColor (0.0, 1.0, 0.0, 0.0); glShadeModel(GL_FLAT); glEnable(GL_DEPTH_TEST); #ifdef USE_UNIT glActiveTexture(USE_UNIT); #endif makeCheckImage(); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); #if USE_VERSION_1_1 glGenTextures(1, &texName); glBindTexture(GL_TEXTURE_2D, texName); #endif glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); #if USE_VERSION_1_1 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth, checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage); #else glTexImage2D(GL_TEXTURE_2D, 0, 4, checkImageWidth, checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage); #endif } void dreamTorusDisplay(bool clear) { if (clear) glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glEnable(GL_TEXTURE_2D); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); #if USE_VERSION_1_1 glBindTexture(GL_TEXTURE_2D, texName); #endif glBegin(GL_QUADS); #ifdef USE_UNIT glMultiTexCoord2f(USE_UNIT, 0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0); glMultiTexCoord2f(USE_UNIT, 0.0, 1.0); glVertex3f(-2.0, 1.0, 0.0); glMultiTexCoord2f(USE_UNIT, 1.0, 1.0); glVertex3f(0.0, 1.0, 0.0); glMultiTexCoord2f(USE_UNIT, 1.0, 0.0); glVertex3f(0.0, -1.0, 0.0); glMultiTexCoord2f(USE_UNIT, 0.0, 0.0); glVertex3f(1.0, -1.0, 0.0); glMultiTexCoord2f(USE_UNIT, 0.0, 1.0); glVertex3f(1.0, 1.0, 0.0); glMultiTexCoord2f(USE_UNIT, 1.0, 1.0); glVertex3f(2.41421, 1.0, -1.41421); glMultiTexCoord2f(USE_UNIT, 1.0, 0.0); glVertex3f(2.41421, -1.0, -1.41421); #else glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0); glTexCoord2f(0.0, 1.0); glVertex3f(-2.0, 1.0, 0.0); glTexCoord2f(1.0, 1.0); glVertex3f(0.0, 1.0, 0.0); glTexCoord2f(1.0, 0.0); glVertex3f(0.0, -1.0, 0.0); glTexCoord2f(0.0, 0.0); glVertex3f(1.0, -1.0, 0.0); glTexCoord2f(0.0, 1.0); glVertex3f(1.0, 1.0, 0.0); glTexCoord2f(1.0, 1.0); glVertex3f(2.41421, 1.0, -1.41421); glTexCoord2f(1.0, 0.0); glVertex3f(2.41421, -1.0, -1.41421); #endif glEnd(); glFlush(); glDisable(GL_TEXTURE_2D); } void dreamTorusReshape(int w, int h) { glViewport(0, 0, (GLsizei) w, (GLsizei) h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); glTranslatef(0.0, 0.0, -3.6); }