Demos (master): trivial/tri-edgeflag-pv: test provoking vertex effect on edge flags

[Brian Paul]

Module: Demos
Branch: master
Commit: aedde83e456a61f237269034cd36f9d2fbbcf18d
URL:    http://cgit.freedesktop.org/mesa/demos/commit/?id=aedde83e456a61f237269034cd36f9d2fbbcf18d

Author: Brian Paul <brianp at vmware.com>
Date:   Fri Jun 10 15:31:23 2011 -0600

trivial/tri-edgeflag-pv: test provoking vertex effect on edge flags

---

 src/trivial/Makefile.am       |    1 +
 src/trivial/tri-edgeflag-pv.c |  150 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 151 insertions(+), 0 deletions(-)

diff --git a/src/trivial/Makefile.am b/src/trivial/Makefile.am
index e5db0c6..bc3da72 100644
--- a/src/trivial/Makefile.am
+++ b/src/trivial/Makefile.am
@@ -128,6 +128,7 @@ bin_PROGRAMS = \
 	tri-cull \
 	tri-dlist \
 	tri-edgeflag \
+	tri-edgeflag-pv \
 	tri-edgeflag-array \
 	trifan \
 	trifan-flat \
diff --git a/src/trivial/tri-edgeflag-pv.c b/src/trivial/tri-edgeflag-pv.c
new file mode 100644
index 0000000..fa54821
--- /dev/null
+++ b/src/trivial/tri-edgeflag-pv.c
@@ -0,0 +1,150 @@
+/*
+ * 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 <glew.h>
+#include "glut_wrap.h"
+
+static GLenum doubleBuffer;
+static GLenum frontface = GL_CCW;
+static GLboolean ProvokeFirst = 0;
+
+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));
+   fflush(stderr);
+   glShadeModel(GL_FLAT);
+}
+
+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 'f':
+      frontface = (frontface == GL_CCW) ? GL_CW : GL_CCW;
+      glFrontFace(frontface);
+      break;
+   case 'p':
+      ProvokeFirst = !ProvokeFirst;
+      printf("provoke first: %d\n", ProvokeFirst);
+      if (ProvokeFirst)
+         glProvokingVertexEXT(GL_FIRST_VERTEX_CONVENTION_EXT);
+      else
+         glProvokingVertexEXT(GL_LAST_VERTEX_CONVENTION_EXT);
+      break;
+   case 27:
+      exit(1);
+   default:
+      return;
+   }
+
+    glutPostRedisplay();
+}
+
+static void Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT); 
+   glPolygonMode(GL_FRONT, GL_LINE);
+   glPolygonMode(GL_BACK, GL_POINT);
+
+   glBegin(GL_TRIANGLES);
+   glEdgeFlag(1);
+   glColor3f(0.3,0.3,.9); 
+   glVertex3f( 0.9, -0.9, -0.0);
+   glEdgeFlag(0);
+   glColor3f(.8,0,0); 
+   glVertex3f( 0.9,  0.9, -0.0);
+   glEdgeFlag(1);
+   glColor3f(0,.9,0); 
+   glVertex3f(-0.9,  0.0, -0.0);
+   glEnd();
+
+   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);
+    }
+
+    glutInitWindowPosition(0, 0); glutInitWindowSize( 250, 250);
+
+    type = GLUT_RGB | GLUT_ALPHA;
+    type |= (doubleBuffer) ? GLUT_DOUBLE : GLUT_SINGLE;
+    glutInitDisplayMode(type);
+
+    if (glutCreateWindow(*argv) == GL_FALSE) {
+	exit(1);
+    }
+
+    glewInit();
+    Init();
+
+    glutReshapeFunc(Reshape);
+    glutKeyboardFunc(Key);
+    glutDisplayFunc(Draw);
+    glutMainLoop();
+    return 0;
+}