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Diffstat (limited to 'progs/tests/mipgen.c')
| -rw-r--r-- | progs/tests/mipgen.c | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/progs/tests/mipgen.c b/progs/tests/mipgen.c new file mode 100644 index 0000000000..088f643215 --- /dev/null +++ b/progs/tests/mipgen.c @@ -0,0 +1,207 @@ +/* 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 + * Unpublished-- rights reserved under the copyright laws of the + * United States.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. + */ + +#include <stdlib.h> +#include <stdio.h> +#include <GL/glew.h> +#include <GL/glut.h> + +#include "readtex.h" + + +static GLfloat LodBias = 6.0; /* make smallest miplevel visible */ +static GLuint texImage; + +#define WIDTH 2 +#define HEIGHT 2 + +static void +InitValues(void) +{ + LodBias = 6.0; /* make smallest miplevel visible */ +} + + +static void MakeImage(void) +{ + const GLubyte color0[4] = { 0xff, 0x80, 0x20, 0xff }; + const GLubyte color1[4] = { 0x10, 0x20, 0x40, 0xff }; + + GLubyte img[WIDTH*HEIGHT*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+j)%2); + if (p == 0) { + img[k + 0] = color0[0]; + img[k + 1] = color0[1]; + img[k + 2] = color0[2]; + } + else { + img[k + 0] = color1[0]; + img[k + 1] = color1[1]; + img[k + 2] = color1[2]; + } + } + } + + glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_TRUE); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, WIDTH, HEIGHT, 0, + GL_RGB, GL_UNSIGNED_BYTE, img); + glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP_SGIS, GL_FALSE); +} + + + +static void myinit(void) +{ + InitValues(); + + glShadeModel(GL_FLAT); + + glTranslatef(0.0, 0.0, -3.6); + + glPixelStorei(GL_UNPACK_ALIGNMENT, 1); + glGenTextures(1, &texImage); + glBindTexture(GL_TEXTURE_2D, texImage); + MakeImage(); + + 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); + + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_BASE_LEVEL, 0); + glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 1); + + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_LOD, -1); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAX_LOD, 1); + + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, + GL_NEAREST_MIPMAP_NEAREST); +} + + + +static void display(void) +{ + GLfloat tcm = 1.0; + glBindTexture(GL_TEXTURE_2D, texImage); + + printf("Bias=%.2g\n", LodBias); + fflush(stdout); + + glTexEnvf(GL_TEXTURE_FILTER_CONTROL_EXT, GL_TEXTURE_LOD_BIAS_EXT, LodBias); + + glClear(GL_COLOR_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) { + case 'l': + LodBias -= 0.25; + break; + case 'L': + LodBias += 0.25; + break; + case ' ': + InitValues(); + break; + case 27: /* Escape */ + exit(0); + break; + default: + return; + } + glutPostRedisplay(); +} + + +static void usage(void) +{ + printf("usage:\n"); + printf(" l/L decrease/increase GL_TEXTURE_LOD_BIAS\n"); + printf(" SPACE reset values\n"); +} + + +int main(int argc, char** argv) +{ + glutInit(&argc, argv); + glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB ); + 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. */ +} |