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-rw-r--r--progs/trivial/pgon-mode.c136
1 files changed, 136 insertions, 0 deletions
diff --git a/progs/trivial/pgon-mode.c b/progs/trivial/pgon-mode.c
new file mode 100644
index 0000000000..db58638619
--- /dev/null
+++ b/progs/trivial/pgon-mode.c
@@ -0,0 +1,136 @@
+/**
+ * Test glPolygonMode.
+ * A tri-strip w/ two tris is drawn so that the first tri is front-facing
+ * but the second tri is back-facing.
+ * Set glPolygonMode differently for the front/back faces
+ *
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+static int Win;
+static GLfloat Zrot = 0;
+static GLboolean FrontFillBackUnfilled = GL_TRUE;
+static GLboolean Lines = GL_TRUE;
+
+
+static void
+Draw(void)
+{
+ glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+
+ if (FrontFillBackUnfilled) {
+ if (Lines) {
+ printf("FrontMode = FILL, BackMode = LINE\n");
+ glPolygonMode(GL_BACK, GL_LINE);
+ }
+ else {
+ printf("FrontMode = FILL, BackMode = POINT\n");
+ glPolygonMode(GL_BACK, GL_POINT);
+ }
+ glPolygonMode(GL_FRONT, GL_FILL);
+ }
+ else {
+ if (Lines) {
+ printf("FrontMode = LINE, BackMode = FILL\n");
+ glPolygonMode(GL_FRONT, GL_LINE);
+ }
+ else {
+ printf("FrontMode = POINT, BackMode = FILL\n");
+ glPolygonMode(GL_FRONT, GL_POINT);
+ }
+ glPolygonMode(GL_BACK, GL_FILL);
+ }
+
+ glPushMatrix();
+ glRotatef(Zrot, 0, 0, 1);
+
+ glBegin(GL_TRIANGLE_STRIP);
+ glVertex2f(-1, 0);
+ glVertex2f( 1, 0);
+ glVertex2f(0, 1);
+ glVertex2f(0, -1);
+ glEnd();
+
+ 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 'p':
+ FrontFillBackUnfilled = !FrontFillBackUnfilled;
+ break;
+ case 'l':
+ Lines = !Lines;
+ break;
+ case 'z':
+ Zrot -= step;
+ break;
+ case 'Z':
+ Zrot += step;
+ break;
+ case 27:
+ glutDestroyWindow(Win);
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void
+Init(void)
+{
+ printf("GL_RENDERER = %s\n", (char*) glGetString(GL_RENDERER));
+
+ glLineWidth(3.0);
+ glPointSize(3.0);
+
+ glColor4f(1, 1, 1, 0.8);
+ glEnable(GL_BLEND);
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+
+ printf("Press 'p' to toggle polygon mode\n");
+}
+
+
+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);
+ glutDisplayFunc(Draw);
+ Init();
+ glutMainLoop();
+ return 0;
+}