+++ /dev/null
-/* 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- * Unpublished-- rights reserved under the copyright laws of the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>
-
-
-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. */
-}
projects / mesa.git / blobdiff