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Diffstat (limited to 'progs/tests/mipmap_limits.c')
| -rw-r--r-- | progs/tests/mipmap_limits.c | 233 |
1 files changed, 233 insertions, 0 deletions
diff --git a/progs/tests/mipmap_limits.c b/progs/tests/mipmap_limits.c new file mode 100644 index 00000000000..6f6d893f77c --- /dev/null +++ b/progs/tests/mipmap_limits.c @@ -0,0 +1,233 @@ +/* Test GL_TEXTURE_BASE_LEVEL and GL_TEXTURE_MAX_LEVEL + * Brian Paul + * 10 May 2006 + */ + + +/* 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 + * Unpublished-- rights reserved under the copyright laws of the + * United States.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.c + * This program demonstrates using mipmaps for texture maps. + * To overtly show the effect of mipmaps, each mipmap reduction + * level has a solidly colored, contrasting texture image. + * Thus, the quadrilateral which is drawn is drawn with several + * different colors. + */ +#include <stdlib.h> +#include <stdio.h> +#include <GL/glut.h> + +static GLint BaseLevel = 0, MaxLevel = 8; +static GLfloat LodBias = 0.0; +static GLboolean NearestFilter = GL_TRUE; + + +static void MakeImage(int level, int width, int height, const GLubyte color[4]) +{ + const int makeStripes = 0; + GLubyte img[256*256*3]; + int i, j; + for (i = 0; i < height; i++) { + for (j = 0; j < width; j++) { + int k = (i * width + j) * 3; + int p = (i/8) & makeStripes; + if (p == 0) { + img[k + 0] = color[0]; + img[k + 1] = color[1]; + img[k + 2] = color[2]; + } + else { + img[k + 0] = 0; + img[k + 1] = 0; + img[k + 2] = 0; + } + } + } + + glTexImage2D(GL_TEXTURE_2D, level, GL_RGB, width, height, 0, + GL_RGB, GL_UNSIGNED_BYTE, img); +} + + +static void makeImages(void) +{ + static const GLubyte colors[8][3] = { + {128, 128, 128 }, + { 0, 255, 255 }, + { 255, 255, 0 }, + { 255, 0, 255 }, + { 255, 0, 0 }, + { 0, 255, 0 }, + { 0, 0, 255 }, + { 255, 255, 255 } + }; + int i, sz = 128; + + for (i = 0; i < 8; i++) { + MakeImage(i, sz, sz, colors[i]); + sz /= 2; + } +} + +static void myinit(void) +{ + glEnable(GL_DEPTH_TEST); + glDepthFunc(GL_LESS); + glShadeModel(GL_FLAT); + + glTranslatef(0.0, 0.0, -3.6); + + glPixelStorei(GL_UNPACK_ALIGNMENT, 1); + 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 = 4.0; + printf("GL_TEXTURE_BASE_LEVEL = %d GL_TEXTURE_MAX_LEVEL = %d Bias = %.2g filter = %s\n", + BaseLevel, MaxLevel, LodBias, + NearestFilter ? "LINEAR" : "NEAREST"); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, BaseLevel); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, MaxLevel); + + 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, tcm); glVertex3f(3000.0, 1.0, -6000.0); + glTexCoord2f(tcm, 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) { + 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 -= 0.02; + break; + case 'L': + LodBias += 0.02; + break; + case 'f': + NearestFilter = !NearestFilter; + break; + case 27: /* Escape */ + exit(0); + break; + default: + return; + } + glutPostRedisplay(); +} + + +static void usage(void) +{ + printf("usage:\n"); + printf(" b/B decrease/increase GL_TEXTURE_BASE_LEVEL\n"); + printf(" m/M decrease/increase GL_TEXTURE_MAX_LEVEL\n"); + printf(" f toggle nearest/linear filtering\n"); +} + + +int main(int argc, char** argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB | GLUT_DEPTH); + glutInitWindowSize (600, 600); + glutCreateWindow (argv[0]); + myinit(); + glutReshapeFunc (myReshape); + glutDisplayFunc(display); + glutKeyboardFunc(key); + usage(); + glutMainLoop(); + return 0; /* ANSI C requires main to return int. */ +} |