/opengles/redbook/texbind.c
http://ftk.googlecode.com/ · C · 183 lines · 128 code · 16 blank · 39 comment · 4 complexity · 2b54b9cd77f9e6a51ff33bf9c73de361 MD5 · raw file
- /*
- * License Applicability. Except to the extent portions of this file are
- * made subject to an alternative license as permitted in the SGI Free
- * Software License B, Version 1.1 (the "License"), the contents of this
- * file are subject only to the provisions of the License. You may not use
- * this file except in compliance with the License. You may obtain a copy
- * of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
- * Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
- *
- * http://oss.sgi.com/projects/FreeB
- *
- * Note that, as provided in the License, the Software is distributed on an
- * "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
- * DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
- * CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
- * PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
- *
- * Original Code. The Original Code is: OpenGL Sample Implementation,
- * Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
- * Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
- * Copyright in any portions created by third parties is as indicated
- * elsewhere herein. All Rights Reserved.
- *
- * Additional Notice Provisions: The application programming interfaces
- * established by SGI in conjunction with the Original Code are The
- * OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
- * April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
- * 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
- * Window System(R) (Version 1.3), released October 19, 1998. This software
- * was created using the OpenGL(R) version 1.2.1 Sample Implementation
- * published by SGI, but has not been independently verified as being
- * compliant with the OpenGL(R) version 1.2.1 Specification.
- *
- */
- /* texbind.c
- * This program demonstrates using glBindTexture() by
- * creating and managing two textures.
- */
- #include <stdlib.h>
- #include <stdio.h>
- #include "ug.h"
- #if defined(GL_VERSION_1_1) || defined(GL_OES_VERSION_1_0)
- /* Create checkerboard texture */
- #define checkImageWidth 64
- #define checkImageHeight 64
- static GLubyte checkImage[checkImageHeight][checkImageWidth][4];
- static GLubyte otherImage[checkImageHeight][checkImageWidth][4];
- static GLuint texName[2];
- void makeCheckImages(void)
- {
- int i, j, c;
-
- for (i = 0; i < checkImageHeight; i++) {
- for (j = 0; j < checkImageWidth; j++) {
- c = ((((i&0x8)==0)^((j&0x8))==0))*255;
- checkImage[i][j][0] = (GLubyte) c;
- checkImage[i][j][1] = (GLubyte) c;
- checkImage[i][j][2] = (GLubyte) c;
- checkImage[i][j][3] = (GLubyte) 255;
- c = ((((i&0x10)==0)^((j&0x10))==0))*255;
- otherImage[i][j][0] = (GLubyte) c;
- otherImage[i][j][1] = (GLubyte) 0;
- otherImage[i][j][2] = (GLubyte) 0;
- otherImage[i][j][3] = (GLubyte) 255;
- }
- }
- }
- void init(void)
- {
- static const GLfloat v[] = {
- -2.0, -1.0, 0.0,
- -2.0, 1.0, 0.0,
- 0.0, -1.0, 0.0,
- 0.0, 1.0, 0.0,
- 1.0, -1.0, 0.0,
- 1.0, 1.0, 0.0,
- 2.41421, -1.0, -1.41421,
- 2.41421, 1.0, -1.41421,
- };
- static const GLfloat t[] = {
- 0.0, 0.0,
- 0.0, 1.0,
- 1.0, 0.0,
- 1.0, 1.0,
- 0.0, 0.0,
- 0.0, 1.0,
- 1.0, 0.0,
- 1.0, 1.0,
- };
- glClearColor (0.0, 0.0, 0.0, 0.0);
- glShadeModel(GL_FLAT);
- glEnable(GL_DEPTH_TEST);
- makeCheckImages();
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
- glGenTextures(2, texName);
- glBindTexture(GL_TEXTURE_2D, texName[0]);
- glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
- glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
- glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER,
- GL_NEAREST);
- glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER,
- GL_NEAREST);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth,
- checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
- checkImage);
- glBindTexture(GL_TEXTURE_2D, texName[1]);
- glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
- glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
- glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth,
- checkImageHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE,
- otherImage);
- glEnable(GL_TEXTURE_2D);
- glVertexPointer(3, GL_FLOAT, 0, v);
- glTexCoordPointer(2, GL_FLOAT, 0, t);
- glEnableClientState(GL_VERTEX_ARRAY);
- glEnableClientState(GL_TEXTURE_COORD_ARRAY);
- }
- void display(UGWindow uwin)
- {
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
- glBindTexture(GL_TEXTURE_2D, texName[0]);
- glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
- glBindTexture(GL_TEXTURE_2D, texName[1]);
- glDrawArrays(GL_TRIANGLE_STRIP, 4, 4);
- glFlush();
- ugSwapBuffers(uwin);
- }
- void reshape(UGWindow uwin, int w, int h)
- {
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- ugluPerspectivef(60.0, (GLfloat) w/(GLfloat) h, 1.0, 30.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
- glTranslatef(0.0, 0.0, -3.6);
- }
- void keyboard(UGWindow uwin, int key, int x, int y)
- {
- switch (key) {
- case 27:
- exit(0);
- break;
- }
- }
- int main(int argc, char** argv)
- {
- UGCtx ug = ugInit();
- UGWindow uwin = ugCreateWindow (ug, "UG_DEPTH", argv[0], 250, 250, 100, 100);
- init();
- ugDisplayFunc(uwin, display);
- ugReshapeFunc(uwin, reshape);
- ugKeyboardFunc(uwin, keyboard);
- ugMainLoop(ug);
- return 0;
- }
- #else
- int main(int argc, char** argv)
- {
- fprintf (stderr, "This program demonstrates a feature which is not in OpenGL Version 1.0.\n");
- fprintf (stderr, "If your implementation of OpenGL Version 1.0 has the right extensions,\n");
- fprintf (stderr, "you may be able to modify this program to make it run.\n");
- return 0;
- }
- #endif