/* Copyright (c) Mark J. Kilgard, 1994. */ /* * (c) Copyright 1993, 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 * Unpublished-- rights reserved under the copyright laws of the * United States.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(TM) is a trademark of Silicon Graphics, Inc. */ /* mipmap_comp * Test compressed texture mipmaps * * Based on mipmap_limits */ #include #include #include #include #include #include "readtex.h" #define SIZE 16 /* not larger then 16 */ static GLint BaseLevel = 0, MaxLevel ; static GLfloat MinLod, MaxLod; static GLfloat LodBias; static GLboolean NearestFilter; static GLuint texImage; static GLuint View; struct view { GLfloat minLod; GLfloat maxLod; const char *string; }; static struct view views[] = { { 0, 0, "Green" }, { 0, 1, "Green, Red" }, { 0, 2, "Green, Red, Blue" }, { 0, 3, "Green, Red, Blue, Black" }, { 0, 4, "Green, Red, Blue, Black, White" }, { 1, 4, "Red, Blue, Black, White" }, { 2, 4, "Blue, Black, White" }, { 3, 4, "Black, White" }, { 4, 4, "White" }, { 3, 3, "Black" }, { 2, 2, "Blue" }, { 1, 1, "Red" }, { 1, 3, "Red, Blue, Black" }, { 1, 2, "Red, Blue" }, { 2, 3, "Blue, Black" }, { 0, 0, NULL }, }; static void initValues(void) { View = 12; BaseLevel = 0; MaxLevel = 9; MinLod = views[View].minLod; MaxLod = views[View].maxLod; LodBias = 5.0; NearestFilter = GL_TRUE; } static void changeView(void) { if (views[++View].string == NULL) View = 0; MinLod = views[View].minLod; MaxLod = views[View].maxLod; } static void makeImage(int level, int width, int height) { GLubyte img[SIZE*SIZE*3]; GLubyte color[5][3] = { { 0, 255, 0 }, { 255, 0, 0 }, { 0, 0, 255 }, { 0, 0, 0 }, { 255, 255, 255 }, }; int i, j; for (i = 0; i < height; i++) { for (j = 0; j < width; j++) { int k = (i * width + j) * 3; img[k + 0] = color[level][0]; img[k + 1] = color[level][1]; img[k + 2] = color[level][2]; } } glTexImage2D(GL_TEXTURE_2D, level, 3, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, img); } static void makeImages(void) { int i, sz; for (i = 0, sz = SIZE; sz >= 1; i++, sz /= 2) { makeImage(i, sz, sz); printf("Level %d size: %d x %d\n", i, sz, sz); } } static void myInit(void) { initValues(); glEnable(GL_DEPTH_TEST); glDepthFunc(GL_LESS); glShadeModel(GL_FLAT); glTranslatef(0.0, 0.0, -3.6); glPixelStorei(GL_UNPACK_ALIGNMENT, 1); glGenTextures(1, &texImage); glBindTexture(GL_TEXTURE_2D, texImage); makeImages(); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT); glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL); glEnable(GL_TEXTURE_2D); } static void display(void) { GLfloat tcm = 1.0; glBindTexture(GL_TEXTURE_2D, texImage); printf("BASE_LEVEL=%d MAX_LEVEL=%d MIN_LOD=%.2g MAX_LOD=%.2g Bias=%.2g Filter=%s\n", BaseLevel, MaxLevel, MinLod, MaxLod, LodBias, NearestFilter ? "NEAREST" : "LINEAR"); printf("You should see: %s\n", views[View].string ); fflush(stdout); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel); glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, MinLod); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, MaxLod); if (NearestFilter) { glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST); } else { glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR); } glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, LodBias); glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); glBegin(GL_QUADS); glTexCoord2f(0.0, 0.0); glVertex3f(-2.0, -1.0, 0.0); glTexCoord2f(0.0, tcm); glVertex3f(-2.0, 1.0, 0.0); glTexCoord2f(tcm * 3000.0, tcm); glVertex3f(3000.0, 1.0, -6000.0); glTexCoord2f(tcm * 3000.0, 0.0); glVertex3f(3000.0, -1.0, -6000.0); glEnd(); glFlush(); } static void myReshape(int w, int h) { glViewport(0, 0, w, h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(60.0, 1.0*(GLfloat)w/(GLfloat)h, 1.0, 30000.0); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } static void key(unsigned char k, int x, int y) { (void) x; (void) y; switch (k) { #if 0 case 'b': BaseLevel--; if (BaseLevel < 0) BaseLevel = 0; break; case 'B': BaseLevel++; if (BaseLevel > 10) BaseLevel = 10; break; case 'm': MaxLevel--; if (MaxLevel < 0) MaxLevel = 0; break; case 'M': MaxLevel++; if (MaxLevel > 10) MaxLevel = 10; break; case 'l': LodBias -= 0.25; break; case 'L': LodBias += 0.25; break; case 'n': MinLod -= 0.25; break; case 'N': MinLod += 0.25; break; case 'x': MaxLod -= 0.25; break; case 'X': MaxLod += 0.25; break; case 'f': NearestFilter = !NearestFilter; break; #endif case ' ': initValues(); break; case 27: /* Escape */ exit(0); break; default: changeView(); break; } glutPostRedisplay(); } static void usage(void) { printf("usage:\n"); printf(" Any Change view\n"); printf(" SPACE reset values\n"); } int main(int argc, char** argv) { glutInit(&argc, argv); glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); glutInitWindowSize (600, 600); glutCreateWindow (argv[0]); glewInit(); myInit(); glutReshapeFunc (myReshape); glutDisplayFunc(display); glutKeyboardFunc(key); usage(); glutMainLoop(); return 0; /* ANSI C requires main to return int. */ }