Initial revision

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;
+}