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+/* 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+ * Unpublished-- rights reserved under the copyright laws of the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 <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <GL/glew.h>
+#include <GL/glut.h>
+
+#include "readtex.h"
+
+#define SIZE 16 /* not larger then 16 */
+
+static GLint BaseLevel = 0, MaxLevel = 9;
+static GLfloat MinLod = -1, MaxLod = 9;
+static GLfloat LodBias = 0.0;
+static GLboolean NearestFilter = GL_TRUE;
+static GLuint texImage;
+
+
+static void
+initValues(void)
+{
+ BaseLevel = 0;
+ MaxLevel = 9;
+ MinLod = -1;
+ MaxLod = 2;
+ LodBias = 5.0;
+ NearestFilter = GL_TRUE;
+}
+
+
+static void
+makeImage(int level, int width, int height)
+{
+#if 0
+ GLubyte img[SIZE*SIZE*3];
+ int i, j;
+
+ (void)size;
+ for (i = 0; i < height; i++) {
+ for (j = 0; j < width; j++) {
+ int k = (i * width + j) * 3;
+ img[k + 0] = 255 * ((level + 1) % 2);
+ img[k + 1] = 255 * ((level + 1) % 2);
+ img[k + 2] = 255 * ((level + 1) % 2);
+ }
+ }
+
+ glTexImage2D(GL_TEXTURE_2D, level, GL_COMPRESSED_RGB_S3TC_DXT1_EXT, width, height, 0,
+ GL_RGB, GL_UNSIGNED_BYTE, img);
+#else
+ GLubyte img[128];
+ GLint size[] = {
+ 128, /* 16x16 */
+ 32, /* 8x8 */
+ 8, /* 4x4 */
+ 8, /* 2x2 */
+ 8, /* 1x1 */
+ };
+ int i;
+ int value = ((level + 1) % 2) * 0xffffffff;
+ memset(img, 0, 128);
+
+ /* generate black and white mipmap levels */
+ if (value)
+ for (i = 0; i < size[level] / 4; i += 2)
+ ((int*)img)[i] = value;
+
+ glCompressedTexImage2D(GL_TEXTURE_2D, level,
+ GL_COMPRESSED_RGB_S3TC_DXT1_EXT,
+ width, height, 0,
+ size[level], img);
+#endif
+}
+
+
+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");
+ 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) {
+ 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;
+ case ' ':
+ initValues();
+ 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(" n/N decrease/increase GL_TEXTURE_MIN_LOD\n");
+ printf(" x/X decrease/increase GL_TEXTURE_MAX_LOD\n");
+ printf(" l/L decrease/increase GL_TEXTURE_LOD_BIAS\n");
+ printf(" f toggle nearest/linear filtering\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. */
+}
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