add dlist-degenerate test case

2 files changed, 154 insertions, 0 deletions

diff --git a/progs/trivial/Makefile b/progs/trivial/Makefile
index e72fb07..36a5548 100644
--- a/progs/trivial/Makefile
+++ b/progs/trivial/Makefile
@@ -47,6 +47,7 @@ SOURCES = \
 	dlist-edgeflag.c \
 	dlist-dangling.c \
 	dlist-edgeflag-dangling.c \
+	dlist-degenerate.c \
 	drawrange.c \
 	drawelements.c \
 	drawarrays.c \
diff --git a/progs/trivial/dlist-degenerate.c b/progs/trivial/dlist-degenerate.c
new file mode 100644
index 0000000..c7f2d2a
--- /dev/null
+++ b/progs/trivial/dlist-degenerate.c
@@ -0,0 +1,153 @@
+/**
+ * Test display list corner cases.
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+
+static int Win;
+static GLfloat Xrot = 0, Yrot = 0, Zrot = 0;
+static GLboolean Anim = GL_FALSE;
+static GLuint List1 = 0, List2 = 0;
+
+
+static void
+Idle(void)
+{
+   Xrot += 3.0;
+   Yrot += 4.0;
+   Zrot += 2.0;
+   glutPostRedisplay();
+}
+
+
+static void
+Draw(void)
+{
+   glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+   glPushMatrix();
+   glRotatef(Xrot, 1, 0, 0);
+   glRotatef(Yrot, 0, 1, 0);
+   glRotatef(Zrot, 0, 0, 1);
+
+   glCallList(List1);
+   glCallList(List2);
+
+   glPopMatrix();
+
+   glutSwapBuffers();
+}
+
+
+static void
+Reshape(int width, int height)
+{
+   glViewport(0, 0, width, height);
+   glMatrixMode(GL_PROJECTION);
+   glLoadIdentity();
+   glFrustum(-1.0, 1.0, -1.0, 1.0, 5.0, 25.0);
+   glMatrixMode(GL_MODELVIEW);
+   glLoadIdentity();
+   glTranslatef(0.0, 0.0, -15.0);
+}
+
+
+static void
+Key(unsigned char key, int x, int y)
+{
+   const GLfloat step = 3.0;
+   (void) x;
+   (void) y;
+   switch (key) {
+      case 'a':
+         Anim = !Anim;
+         if (Anim)
+            glutIdleFunc(Idle);
+         else
+            glutIdleFunc(NULL);
+         break;
+      case 'z':
+         Zrot -= step;
+         break;
+      case 'Z':
+         Zrot += step;
+         break;
+      case 27:
+         glutDestroyWindow(Win);
+         exit(0);
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+SpecialKey(int key, int x, int y)
+{
+   const GLfloat step = 3.0;
+   (void) x;
+   (void) y;
+   switch (key) {
+      case GLUT_KEY_UP:
+         Xrot -= step;
+         break;
+      case GLUT_KEY_DOWN:
+         Xrot += step;
+         break;
+      case GLUT_KEY_LEFT:
+         Yrot -= step;
+         break;
+      case GLUT_KEY_RIGHT:
+         Yrot += step;
+         break;
+   }
+   glutPostRedisplay();
+}
+
+
+static void
+Init(void)
+{
+   /* List1: start of primitive */
+   List1 = glGenLists(1);
+   glNewList(List1, GL_COMPILE);
+     glBegin(GL_POLYGON);
+     glVertex2f(-1, -1);
+     glVertex2f( 1, -1);
+   glEndList();
+
+   /* List2: end of primitive */
+   List2 = glGenLists(1);
+   glNewList(List2, GL_COMPILE);
+     glVertex2f( 1, 1);
+     glVertex2f(-1, 1);
+     glEnd();
+   glEndList();
+
+   glEnable(GL_DEPTH_TEST);
+}
+
+
+int
+main(int argc, char *argv[])
+{
+   glutInit(&argc, argv);
+   glutInitWindowPosition(0, 0);
+   glutInitWindowSize(400, 400);
+   glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
+   Win = glutCreateWindow(argv[0]);
+   glutReshapeFunc(Reshape);
+   glutKeyboardFunc(Key);
+   glutSpecialFunc(SpecialKey);
+   glutDisplayFunc(Draw);
+   if (Anim)
+      glutIdleFunc(Idle);
+   Init();
+   glutMainLoop();
+   return 0;
+}