Initial revision
diff --git a/progs/samples/accum.c b/progs/samples/accum.c
new file mode 100644
index 0000000..24dfc07
--- /dev/null
+++ b/progs/samples/accum.c
@@ -0,0 +1,157 @@
+/*
+ * Copyright (c) 1991, 1992, 1993 Silicon Graphics, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software and
+ * its documentation for any purpose is hereby granted without fee, provided
+ * that (i) the above copyright notices and this permission notice appear in
+ * all copies of the software and related documentation, and (ii) the name of
+ * Silicon Graphics may not be used in any advertising or
+ * publicity relating to the software without the specific, prior written
+ * permission of Silicon Graphics.
+ *
+ * THE SOFTWARE IS PROVIDED "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 BE LIABLE FOR
+ * ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+ * OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+ * WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
+ * LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
+ * OF THIS SOFTWARE.
+ */
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <GL/glut.h>
+
+
+GLenum doubleBuffer;
+GLint thing1, thing2;
+
+
+static void Init(void)
+{
+
+ glClearColor(0.0, 0.0, 0.0, 0.0);
+ glClearAccum(0.0, 0.0, 0.0, 0.0);
+
+ thing1 = glGenLists(1);
+ glNewList(thing1, GL_COMPILE);
+ glColor3f(1.0, 0.0, 0.0);
+ glRectf(-1.0, -1.0, 1.0, 0.0);
+ glEndList();
+
+ thing2 = glGenLists(1);
+ glNewList(thing2, GL_COMPILE);
+ glColor3f(0.0, 1.0, 0.0);
+ glRectf(0.0, -1.0, 1.0, 1.0);
+ glEndList();
+}
+
+static void Reshape(int width, int height)
+{
+
+ glViewport(0, 0, (GLint)width, (GLint)height);
+
+ glMatrixMode(GL_PROJECTION);
+ glLoadIdentity();
+ glMatrixMode(GL_MODELVIEW);
+ glLoadIdentity();
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case 27:
+ exit(1);
+ case '1':
+ glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
+ break;
+ case '2':
+ glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
+ break;
+ default:
+ return;
+ }
+
+ glutPostRedisplay();
+}
+
+static void Draw(void)
+{
+
+ glPushMatrix();
+
+ glScalef(0.8, 0.8, 1.0);
+
+ glClear(GL_COLOR_BUFFER_BIT);
+ glCallList(thing1);
+ glAccum(GL_LOAD, 0.5);
+
+ glClear(GL_COLOR_BUFFER_BIT);
+ glCallList(thing2);
+ glAccum(GL_ACCUM, 0.5);
+
+ glAccum(GL_RETURN, 1.0);
+
+ glPopMatrix();
+
+ glFlush();
+
+ if (doubleBuffer) {
+ glutSwapBuffers();
+ }
+}
+
+static GLenum Args(int argc, char **argv)
+{
+ GLint i;
+
+ doubleBuffer = GL_FALSE;
+
+ for (i = 1; i < argc; i++) {
+ if (strcmp(argv[i], "-sb") == 0) {
+ doubleBuffer = GL_FALSE;
+ } else if (strcmp(argv[i], "-db") == 0) {
+ doubleBuffer = GL_TRUE;
+ } else {
+ printf("%s (Bad option).\n", argv[i]);
+ return GL_FALSE;
+ }
+ }
+ return GL_TRUE;
+}
+
+int main(int argc, char **argv)
+{
+ GLenum type;
+
+ glutInit(&argc, argv);
+
+ if (Args(argc, argv) == GL_FALSE) {
+ exit(1);
+ }
+
+ glutInitWindowPosition(0, 0);
+ glutInitWindowSize( 300, 300);
+
+ type = GLUT_RGB | GLUT_ACCUM;
+ type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+ glutInitDisplayMode(type);
+
+ if (glutCreateWindow("Accum Test") == GL_FALSE) {
+ exit(1);
+ }
+
+ Init();
+
+ glutReshapeFunc(Reshape);
+ glutKeyboardFunc(Key);
+ glutDisplayFunc(Draw);
+ glutMainLoop();
+ return 0;
+}