+++ /dev/null
-/*
- * Copyright (c) 1993-2003, 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 Unpublished - rights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.
- * 1500 Crittenden Lane
- * Mountain View, CA 94043
- * United State of America
- *
- * OpenGL(R) is a registered trademark of Silicon Graphics, Inc.
- */
-
-/* combiner.c
- * This program renders a variety of quads showing different
- * effects of texture combiner functions.
- *
- * The first row renders an untextured polygon (so you can
- * compare the fragment colors) and then the 2 textures.
- * The second row shows several different combiner functions
- * on a single texture: replace, modulate, add, add-signed,
- * and subtract.
- * The third row shows the interpolate combiner function
- * on a single texture with a constant color/alpha value,
- * varying the amount of interpolation.
- * The fourth row uses multitexturing with two textures
- * and different combiner functions.
- * The fifth row are some combiner experiments: using the
- * scaling factor and reversing the order of subtraction
- * for a combination function.
- */
-#include <GL/glew.h>
-#include <GL/glut.h>
-#include <stdlib.h>
-#include <stdio.h>
-
-#define imageWidth 8
-#define imageHeight 8
-/* arrays for two textures */
-static GLubyte image0[imageHeight][imageWidth][4];
-static GLubyte image1[imageHeight][imageWidth][4];
-
-static GLuint texName[4];
-
-static void makeImages(void)
-{
- int i, j, c;
- for (i = 0; i < imageHeight; i++) {
- for (j = 0; j < imageWidth; j++) {
- c = ((i&2)==0)*255; /* horiz b & w stripes */
- image0[i][j][0] = (GLubyte) c;
- image0[i][j][1] = (GLubyte) c;
- image0[i][j][2] = (GLubyte) c;
- image0[i][j][3] = (GLubyte) 255;
- c = ((j&4)!=0)*128; /* wider vertical 50% cyan and black stripes */
- image1[i][j][0] = (GLubyte) 0;
- image1[i][j][1] = (GLubyte) c;
- image1[i][j][2] = (GLubyte) c;
- image1[i][j][3] = (GLubyte) 255;
- }
- }
-}
-
-static void init(void)
-{
- glClearColor (0.0, 0.0, 0.0, 0.0);
- glShadeModel(GL_SMOOTH);
-
- makeImages();
- glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
-
- glGenTextures(4, texName);
-
- glBindTexture(GL_TEXTURE_2D, texName[0]);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageWidth, imageHeight,
- 0, GL_RGBA, GL_UNSIGNED_BYTE, image0);
-
- glBindTexture(GL_TEXTURE_2D, texName[1]);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
- glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageWidth, imageHeight,
- 0, GL_RGBA, GL_UNSIGNED_BYTE, image1);
-
-/* smooth-shaded polygon with multiple texture coordinates */
- glNewList (1, GL_COMPILE);
- glBegin(GL_QUADS);
- glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 0.0);
- glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 0.0);
- glColor3f (0.5, 1.0, 0.25);
- glVertex3f(0.0, 0.0, 0.0);
- glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 0.0, 2.0);
- glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 0.0, 2.0);
- glColor3f (1.0, 1.0, 1.0);
- glVertex3f(0.0, 1.0, 0.0);
- glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 2.0);
- glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 2.0, 2.0);
- glColor3f (1.0, 1.0, 1.0);
- glVertex3f(1.0, 1.0, 0.0);
- glMultiTexCoord2fARB(GL_TEXTURE0_ARB, 2.0, 0.0);
- glMultiTexCoord2fARB(GL_TEXTURE1_ARB, 2.0, 0.0);
- glColor3f (1.0, 0.5, 0.25);
- glVertex3f(1.0, 0.0, 0.0);
- glEnd();
- glEndList ();
-}
-
-static void display(void)
-{
- static GLfloat constColor[4] = {0.0, 0.0, 0.0, 0.0}; /* for use as constant texture color */
-
- glClear(GL_COLOR_BUFFER_BIT);
-
- glDisable(GL_TEXTURE_2D); /* untextured polygon--see the "fragment" colors */
- glPushMatrix();
- glTranslatef(0.0, 5.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glEnable(GL_TEXTURE_2D);
-/* draw ordinary textured polys; 1 texture unit; combine mode disabled */
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
- glPushMatrix();
- glBindTexture(GL_TEXTURE_2D, texName[0]);
- glTranslatef(1.0, 5.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glPushMatrix();
- glBindTexture(GL_TEXTURE_2D, texName[1]);
- glTranslatef(2.0, 5.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
-/* different combine modes enabled; 1 texture unit
- * defaults are:
- * glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);
- * glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
- * glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);
- * glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
- */
- glBindTexture(GL_TEXTURE_2D, texName[0]);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_REPLACE);
- glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);
- glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
- glPushMatrix();
- glTranslatef(1.0, 4.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);
- glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
- glPushMatrix();
- glTranslatef(2.0, 4.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_ADD);
- glPushMatrix();
- glTranslatef(3.0, 4.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_ADD_SIGNED_ARB);
- glPushMatrix();
- glTranslatef(4.0, 4.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_SUBTRACT_ARB);
- glPushMatrix();
- glTranslatef(5.0, 4.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
-/* interpolate combine with constant color; 1 texture unit
- * use different alpha values for constant color
- * defaults are:
- * glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);
- * glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
- * glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);
- * glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
- * glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);
- * glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);
- */
- constColor[3] = 0.2;
- glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, constColor);
- glBindTexture(GL_TEXTURE_2D, texName[0]);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_INTERPOLATE_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);
- glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
- glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
- glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE2_RGB_ARB, GL_CONSTANT_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND2_RGB_ARB, GL_SRC_ALPHA);
- glPushMatrix();
- glTranslatef(1.0, 3.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- constColor[3] = 0.4;
- glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, constColor);
- glPushMatrix();
- glTranslatef(2.0, 3.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- constColor[3] = 0.6;
- glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, constColor);
- glPushMatrix();
- glTranslatef(3.0, 3.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- constColor[3] = 0.8;
- glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, constColor);
- glPushMatrix();
- glTranslatef(4.0, 3.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
-/* combine textures 0 & 1
- * defaults are:
- * glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_TEXTURE);
- * glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
- * glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_PREVIOUS_ARB);
- * glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
- */
-
- glActiveTextureARB (GL_TEXTURE0_ARB);
- glEnable (GL_TEXTURE_2D);
- glBindTexture(GL_TEXTURE_2D, texName[0]);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);
-
- glActiveTextureARB (GL_TEXTURE1_ARB);
- glEnable (GL_TEXTURE_2D);
- glBindTexture(GL_TEXTURE_2D, texName[1]);
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_REPLACE);
- glPushMatrix();
- glTranslatef(1.0, 2.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- /* try different combiner modes of texture unit 1 */
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);
- glPushMatrix();
- glTranslatef(2.0, 2.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_ADD);
- glPushMatrix();
- glTranslatef(3.0, 2.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_ADD_SIGNED_ARB);
- glPushMatrix();
- glTranslatef(4.0, 2.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_SUBTRACT_ARB);
- glPushMatrix();
- glTranslatef(5.0, 2.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
-/* some experiments */
-
-/* see the effect of RGB_SCALE */
- glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 2.0);
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_REPLACE);
- glPushMatrix();
- glTranslatef(1.0, 1.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_MODULATE);
- glPushMatrix();
- glTranslatef(2.0, 1.0, 0.0);
- glCallList(1);
- glPopMatrix();
- glTexEnvf(GL_TEXTURE_ENV, GL_RGB_SCALE_ARB, 1.0);
-
-/* using SOURCE0 and SOURCE1, reverse the order of subtraction Arg1-Arg0 */
-
- glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_COMBINE_RGB_ARB, GL_SUBTRACT_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE0_RGB_ARB, GL_PREVIOUS_ARB);
- glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND0_RGB_ARB, GL_SRC_COLOR);
- glTexEnvf(GL_TEXTURE_ENV, GL_SOURCE1_RGB_ARB, GL_TEXTURE);
- glTexEnvf(GL_TEXTURE_ENV, GL_OPERAND1_RGB_ARB, GL_SRC_COLOR);
- glPushMatrix();
- glTranslatef(5.0, 1.0, 0.0);
- glCallList(1);
- glPopMatrix();
-
- glActiveTextureARB (GL_TEXTURE1_ARB); /* deactivate multitexturing */
- glDisable (GL_TEXTURE_2D);
- glActiveTextureARB (GL_TEXTURE0_ARB); /* activate single texture unit */
-
- glFlush();
-}
-
-static void reshape(int w, int h)
-{
- glViewport(0, 0, (GLsizei) w, (GLsizei) h);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- gluOrtho2D(0.0, 7.0, 0.0, 7.0);
- glMatrixMode(GL_MODELVIEW);
- glLoadIdentity();
-}
-
-static void keyboard (unsigned char key, int x, int y)
-{
- switch (key) {
- case 27:
- exit(0);
- break;
- default:
- break;
- }
-}
-
-int main(int argc, char** argv)
-{
- glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
- glutInitWindowSize(400, 400);
- glutInitWindowPosition(100, 100);
- glutCreateWindow(argv[0]);
- glewInit();
- init();
- glutDisplayFunc(display);
- glutReshapeFunc(reshape);
- glutKeyboardFunc(keyboard);
- glutMainLoop();
- return 0;
-}
projects / mesa.git / blobdiff