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authorBrian Paul <brian.paul@tungstengraphics.com>2002-10-31 15:25:07 +0000
committerBrian Paul <brian.paul@tungstengraphics.com>2002-10-31 15:25:07 +0000
commit36481524bad56214fa5a00e5899293636f0d46d3 (patch)
tree51022346bb628833f6ea52a1e7c587b6cc9f4cf5 /progs/tests/stencilwrap.c
parent07624e347bdef90b97bfa96eb955c12df4420ca7 (diff)
simple GL_EXT_stencil_wrap test program
Diffstat (limited to 'progs/tests/stencilwrap.c')
-rw-r--r--progs/tests/stencilwrap.c147
1 files changed, 147 insertions, 0 deletions
diff --git a/progs/tests/stencilwrap.c b/progs/tests/stencilwrap.c
new file mode 100644
index 0000000000..e65258b583
--- /dev/null
+++ b/progs/tests/stencilwrap.c
@@ -0,0 +1,147 @@
+/* Test GL_EXT_stencil_wrap extension.
+ * This is by no means complete, just a quick check.
+ *
+ * Brian Paul 30 October 2002
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <GL/glut.h>
+
+
+static void RunTest(void)
+{
+ const GLenum prim = GL_LINES;
+ GLubyte val;
+ int bits, max, i;
+
+ glGetIntegerv(GL_STENCIL_BITS, &bits);
+ max = (1 << bits) - 1;
+
+ glClearStencil(0);
+ glEnable(GL_STENCIL_TEST);
+ glStencilFunc(GL_ALWAYS, 0, ~0);
+
+ /* test GL_INCR (saturation) */
+ glClear(GL_STENCIL_BUFFER_BIT);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
+ printf("Testing GL_INCR...\n");
+ for (i = 1; i < max+10; i++) {
+ int expected = (i > max) ? max : i;
+ glBegin(prim);
+ glVertex2f(0.5, 0.5); glVertex2f(9.5, 0.5);
+ glEnd();
+ glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
+ assert(val == expected);
+ }
+ printf("OK!\n");
+
+ /* test GL_INCR_WRAP_EXT (wrap around) */
+ glClear(GL_STENCIL_BUFFER_BIT);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP_EXT);
+ printf("Testing GL_INCR_WRAP_EXT...\n");
+ for (i = 1; i < max+10; i++) {
+ int expected = i % (max + 1);
+ glBegin(prim);
+ glVertex2f(0.5, 0.5); glVertex2f(9.5, 0.5);
+ glEnd();
+ glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
+ assert(val == expected);
+ }
+ printf("OK!\n");
+
+ glClearStencil(max);
+
+ /* test GL_INCR (saturation) */
+ glClear(GL_STENCIL_BUFFER_BIT);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_DECR);
+ printf("Testing GL_DECR...\n");
+ for (i = max-1; i > -10; i--) {
+ int expected = (i < 0) ? 0 : i;
+ glBegin(prim);
+ glVertex2f(0.5, 0.5); glVertex2f(9.5, 0.5);
+ glEnd();
+ glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
+ assert(val == expected);
+ }
+ printf("OK!\n");
+
+ /* test GL_INCR_WRAP_EXT (wrap-around) */
+ glClear(GL_STENCIL_BUFFER_BIT);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP_EXT);
+ printf("Testing GL_DECR_WRAP_EXT...\n");
+ for (i = max-1; i > -10; i--) {
+ int expected = (i < 0) ? max + i + 1: i;
+ glBegin(prim);
+ glVertex2f(0.5, 0.5); glVertex2f(9.5, 0.5);
+ glEnd();
+ glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
+ assert(val == expected);
+ }
+ printf("OK!\n");
+
+ glDisable(GL_STENCIL_TEST);
+}
+
+
+static void Display( void )
+{
+ glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+ RunTest();
+
+ glutSwapBuffers();
+}
+
+
+static void Reshape( int width, int height )
+{
+ glViewport( 0, 0, width, height );
+ glMatrixMode( GL_PROJECTION );
+ glLoadIdentity();
+ glOrtho(0, width, 0, height, -1, 1);
+ glMatrixMode( GL_MODELVIEW );
+ glLoadIdentity();
+}
+
+
+static void Key( unsigned char key, int x, int y )
+{
+ (void) x;
+ (void) y;
+ switch (key) {
+ case 27:
+ exit(0);
+ break;
+ }
+ glutPostRedisplay();
+}
+
+
+static void Init( void )
+{
+ printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
+ printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
+ if (!glutExtensionSupported("GL_EXT_stencil_wrap")) {
+ printf("Sorry, GL_EXT_stencil_wrap not supported.\n");
+ exit(1);
+ }
+}
+
+
+int main( int argc, char *argv[] )
+{
+ glutInit( &argc, argv );
+ glutInitWindowPosition( 0, 0 );
+ glutInitWindowSize( 400, 400 );
+ glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE | GLUT_STENCIL );
+ glutCreateWindow(argv[0]);
+ glutReshapeFunc( Reshape );
+ glutKeyboardFunc( Key );
+ glutDisplayFunc( Display );
+ Init();
+ glutMainLoop();
+ return 0;
+}