--- /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+ * Unpublished-- rights reserved under the copyright laws of the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>
+
+#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. */
+}
projects / mesa.git / commitdiff