--- /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+ * Unpublished-- rights reserved under the copyright laws of the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.
+ */
+/* 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>
+
+GLubyte mipmapImage64[64][64][3];
+GLubyte mipmapImage32[32][32][3];
+GLubyte mipmapImage16[16][16][3];
+GLubyte mipmapImage8[8][8][3];
+GLubyte mipmapImage4[4][4][3];
+GLubyte mipmapImage2[2][2][3];
+GLubyte mipmapImage1[1][1][3];
+
+static GLint BaseLevel = 0, MaxLevel = 8;
+static GLboolean NearestFilter = GL_TRUE;
+
+static void makeImages(void)
+{
+ int i, j;
+
+ for (i = 0; i < 64; i++) {
+ for (j = 0; j < 64; j++) {
+ mipmapImage64[i][j][0] = 0;
+ mipmapImage64[i][j][1] = 255;
+ mipmapImage64[i][j][2] = 255;
+ }
+ }
+ for (i = 0; i < 32; i++) {
+ for (j = 0; j < 32; j++) {
+ mipmapImage32[i][j][0] = 255;
+ mipmapImage32[i][j][1] = 255;
+ mipmapImage32[i][j][2] = 0;
+ }
+ }
+ for (i = 0; i < 16; i++) {
+ for (j = 0; j < 16; j++) {
+ mipmapImage16[i][j][0] = 255;
+ mipmapImage16[i][j][1] = 0;
+ mipmapImage16[i][j][2] = 255;
+ }
+ }
+ for (i = 0; i < 8; i++) {
+ for (j = 0; j < 8; j++) {
+ mipmapImage8[i][j][0] = 255;
+ mipmapImage8[i][j][1] = 0;
+ mipmapImage8[i][j][2] = 0;
+ }
+ }
+ for (i = 0; i < 4; i++) {
+ for (j = 0; j < 4; j++) {
+ mipmapImage4[i][j][0] = 0;
+ mipmapImage4[i][j][1] = 255;
+ mipmapImage4[i][j][2] = 0;
+ }
+ }
+ for (i = 0; i < 2; i++) {
+ for (j = 0; j < 2; j++) {
+ mipmapImage2[i][j][0] = 0;
+ mipmapImage2[i][j][1] = 0;
+ mipmapImage2[i][j][2] = 255;
+ }
+ }
+ mipmapImage1[0][0][0] = 255;
+ mipmapImage1[0][0][1] = 255;
+ mipmapImage1[0][0][2] = 255;
+}
+
+static void myinit(void)
+{
+ glEnable(GL_DEPTH_TEST);
+ glDepthFunc(GL_LESS);
+ glShadeModel(GL_FLAT);
+
+ glTranslatef(0.0, 0.0, -3.6);
+ makeImages();
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
+ glTexImage2D(GL_TEXTURE_2D, 0, 3, 64, 64, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage64[0][0][0]);
+ glTexImage2D(GL_TEXTURE_2D, 1, 3, 32, 32, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage32[0][0][0]);
+ glTexImage2D(GL_TEXTURE_2D, 2, 3, 16, 16, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage16[0][0][0]);
+ glTexImage2D(GL_TEXTURE_2D, 3, 3, 8, 8, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage8[0][0][0]);
+ glTexImage2D(GL_TEXTURE_2D, 4, 3, 4, 4, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage4[0][0][0]);
+ glTexImage2D(GL_TEXTURE_2D, 5, 3, 2, 2, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage2[0][0][0]);
+ glTexImage2D(GL_TEXTURE_2D, 6, 3, 1, 1, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, &mipmapImage1[0][0][0]);
+ 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)
+{
+ printf("GL_TEXTURE_BASE_LEVEL = %d GL_TEXTURE_MAX_LEVEL = %d filter = %s\n",
+ BaseLevel, MaxLevel,
+ 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);
+ }
+
+ 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, 8.0); glVertex3f(-2.0, 1.0, 0.0);
+ glTexCoord2f(8.0, 8.0); glVertex3f(3000.0, 1.0, -6000.0);
+ glTexCoord2f(8.0, 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 '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 '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 (500, 500);
+ glutCreateWindow (argv[0]);
+ myinit();
+ glutReshapeFunc (myReshape);
+ glutDisplayFunc(display);
+ glutKeyboardFunc(key);
+ usage();
+ glutMainLoop();
+ return 0; /* ANSI C requires main to return int. */
+}
projects / mesa.git / commitdiff