1 files changed, 153 insertions, 0 deletions
diff --git a/progs/trivial/tri-mask-tri.c b/progs/trivial/tri-mask-tri.c
new file mode 100644
index 0000000000..8333f7ed8a
--- /dev/null
+++ b/progs/trivial/tri-mask-tri.c
@@ -0,0 +1,153 @@
+/*
+ * 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>
+
+
+GLint Width = 250, Height = 250;
+GLenum doubleBuffer;
+GLint Win;
+GLboolean Rmask = GL_TRUE, Gmask = GL_FALSE, Bmask = GL_TRUE;
+
+
+static void Init(void)
+{
+   fprintf(stderr, "GL_RENDERER   = %s\n", (char *) glGetString(GL_RENDERER));
+   fprintf(stderr, "GL_VERSION    = %s\n", (char *) glGetString(GL_VERSION));
+   fprintf(stderr, "GL_VENDOR     = %s\n", (char *) glGetString(GL_VENDOR));
+   glClearColor(0.0, 0.0, 1.0, 0.0);
+}
+
+static void Reshape(int width, int height)
+{
+   glViewport(0, 0, (GLint)width, (GLint)height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glOrtho(-1.0, 1.0, -1.0, 1.0, -0.5, 1000.0);
+   glMatrixMode(GL_MODELVIEW);
+}
+
+static void Key(unsigned char key, int x, int y)
+{
+   switch (key) {
+   case 'r':
+      Rmask = !Rmask;
+      break;
+   case 'g':
+      Gmask = !Gmask;
+      break;
+   case 'b':
+      Bmask = !Bmask;
+      break;
+   case 27:
+      glutDestroyWindow(Win);
+      exit(1);
+   default:
+      return;
+   }
+   glutPostRedisplay();
+}
+
+static void Draw(void)
+{
+   printf("ColorMask = %d, %d, %d\n", Rmask, Gmask, Bmask);
+   glColorMask(1,1,1,1);
+
+   glClear(GL_COLOR_BUFFER_BIT); 
+
+   /* right triangle: green */
+   glBegin(GL_TRIANGLES);
+   glColor3f(0,1,0); 
+   glVertex3f( 0.9, -0.9, -30.0);
+   glVertex3f( 0.9,  0.9, -30.0);
+   glVertex3f(-0.9,  0.0, -30.0);
+   glEnd();
+
+   glColorMask(Rmask, Gmask, Bmask, 0);
+
+   /* left triangle: white&mask: purple   middle region: white */
+   glBegin(GL_TRIANGLES);
+   glColor3f(1,1,1); 
+   glVertex3f(-0.9, -0.9, -30.0);
+   glVertex3f(-0.9,  0.9, -30.0);
+   glVertex3f( 0.9,  0.0, -30.0);
+   glEnd();
+
+   glDisable(GL_SCISSOR_TEST);
+
+   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 {
+         fprintf(stderr, "%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);
+   }
+
+   type = GLUT_RGB;
+   type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+
+   glutInitWindowPosition(100, 0); glutInitWindowSize(Width, Height);
+   glutInitDisplayMode(type);
+   Win = glutCreateWindow("First Tri");
+   Init();
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutDisplayFunc(Draw);
+   glutMainLoop();
+   return 0;
+}