+++ /dev/null
-/* 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/glew.h>
-#include <GL/glut.h>
-
-GLboolean wrapping;
-
-static void RunTest(void)
-{
- const GLenum prim = GL_QUAD_STRIP;
- GLubyte val;
- int bits, max, i;
- int expected;
- GLboolean failed;
-
- glGetIntegerv(GL_STENCIL_BITS, &bits);
- max = (1 << bits) - 1;
-
-
- glEnable(GL_STENCIL_TEST);
- glStencilFunc(GL_ALWAYS, 0, ~0);
-
- /* test GL_KEEP */
- glClearStencil(max);
- glClear(GL_STENCIL_BUFFER_BIT);
- glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
- failed = GL_FALSE;
- printf("Testing GL_KEEP...\n");
- expected = max;
- glBegin(prim);
- glVertex2f(0, 0);
- glVertex2f(10, 0);
- glVertex2f(0, 10);
- glVertex2f(10, 10);
- glEnd();
- glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
- if (val != expected) {
- printf("Failed GL_KEEP test(got %u, expected %u)\n", val, expected);
- failed = GL_TRUE;
- }
- else
- printf("OK!\n");
-
- /* test GL_ZERO */
- glClearStencil(max);
- glClear(GL_STENCIL_BUFFER_BIT);
- glStencilOp(GL_KEEP, GL_KEEP, GL_ZERO);
- failed = GL_FALSE;
- printf("Testing GL_ZERO...\n");
- expected = 0;
- glBegin(prim);
- glVertex2f(0, 0);
- glVertex2f(10, 0);
- glVertex2f(0, 10);
- glVertex2f(10, 10);
- glEnd();
- glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
- if (val != expected) {
- printf("Failed GL_ZERO test(got %u, expected %u)\n", val, expected);
- failed = GL_TRUE;
- }
- else
- printf("OK!\n");
-
- /* test GL_REPLACE */
- glClearStencil(max);
- glClear(GL_STENCIL_BUFFER_BIT);
- glStencilOp(GL_KEEP, GL_KEEP, GL_REPLACE);
- failed = GL_FALSE;
- printf("Testing GL_REPLACE...\n");
- expected = 0;
- glBegin(prim);
- glVertex2f(0, 0);
- glVertex2f(10, 0);
- glVertex2f(0, 10);
- glVertex2f(10, 10);
- glEnd();
- glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
- if (val != expected) {
- printf("Failed GL_REPLACE test(got %u, expected %u)\n", val, expected);
- failed = GL_TRUE;
- }
- else
- printf("OK!\n");
-
- /* test GL_INCR (saturation) */
- glClearStencil(0);
- glClear(GL_STENCIL_BUFFER_BIT);
- glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
- failed = GL_FALSE;
- printf("Testing GL_INCR...\n");
- for (i = 1; i < max+10; i++) {
- expected = (i > max) ? max : i;
- glBegin(prim);
- glVertex2f(0, 0); glVertex2f(10, 0);
- glVertex2f(0, 10); glVertex2f(10, 10);
- glEnd();
-
- glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
- if (val != expected) {
- printf( "Failed GL_INCR test on iteration #%u "
- "(got %u, expected %u)\n", i, val, expected );
- failed = GL_TRUE;
- }
- }
- if ( !failed )
- printf("OK!\n");
-
- /* test GL_DECR (saturation) */
- glClearStencil(max);
- glClear(GL_STENCIL_BUFFER_BIT);
- glStencilOp(GL_KEEP, GL_KEEP, GL_DECR);
- failed = GL_FALSE;
- printf("Testing GL_DECR...\n");
- for (i = max-1; i > -10; i--) {
- expected = (i < 0) ? 0 : i;
- glBegin(prim);
- glVertex2f(0, 0); glVertex2f(10, 0);
- glVertex2f(0, 10); glVertex2f(10, 10);
- glEnd();
- glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
- if (val != expected) {
- printf( "Failed GL_DECR test on iteration #%u "
- "(got %u, expected %u)\n", max - i, val, expected );
- failed = GL_TRUE;
- }
- }
- if ( !failed )
- printf("OK!\n");
-
- /* test GL_INVERT */
- glClearStencil(0);
- glClear(GL_STENCIL_BUFFER_BIT);
- glStencilOp(GL_KEEP, GL_KEEP, GL_INVERT);
- failed = GL_FALSE;
- printf("Testing GL_INVERT...\n");
- expected = max;
- glBegin(prim);
- glVertex2f(0, 0);
- glVertex2f(10, 0);
- glVertex2f(0, 10);
- glVertex2f(10, 10);
- glEnd();
- glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
- if (val != expected) {
- printf("Failed GL_INVERT test(got %u, expected %u)\n", val, expected);
- failed = GL_TRUE;
- }
- else
- printf("OK!\n");
-
- if(wrapping)
- {
- /* test GL_INCR_WRAP_EXT (wrap around) */
- glClearStencil(0);
- glClear(GL_STENCIL_BUFFER_BIT);
- glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP_EXT);
- failed = GL_FALSE;
- printf("Testing GL_INCR_WRAP_EXT...\n");
- for (i = 1; i < max+10; i++) {
- expected = i % (max + 1);
- glBegin(prim);
- glVertex2f(0, 0); glVertex2f(10, 0);
- glVertex2f(0, 10); glVertex2f(10, 10);
- glEnd();
- glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
- if (val != expected) {
- printf( "Failed GL_INCR_WRAP test on iteration #%u "
- "(got %u, expected %u)\n", i, val, expected );
- failed = GL_TRUE;
- }
- }
- if ( !failed )
- printf("OK!\n");
-
- /* test GL_DECR_WRAP_EXT (wrap-around) */
- glClearStencil(max);
- glClear(GL_STENCIL_BUFFER_BIT);
- glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP_EXT);
- failed = GL_FALSE;
- printf("Testing GL_DECR_WRAP_EXT...\n");
- for (i = max-1; i > -10; i--) {
- expected = (i < 0) ? max + i + 1: i;
- glBegin(prim);
- glVertex2f(0, 0); glVertex2f(10, 0);
- glVertex2f(0, 10); glVertex2f(10, 10);
- glEnd();
- glReadPixels(0, 0, 1, 1, GL_STENCIL_INDEX, GL_UNSIGNED_BYTE, &val);
- if (val != expected) {
- printf( "Failed GL_DECR_WRAP test on iteration #%u "
- "(got %u, expected %u)\n", max - i, val, expected );
- failed = GL_TRUE;
- }
- }
- if ( !failed )
- 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 )
-{
- const char * ver_str;
- float version;
-
- printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
- printf("GL_VERSION = %s\n", (char *) glGetString(GL_VERSION));
-
-
- /* Check for both the extension string and GL version 1.4 on the
- * outside chance that some vendor exports version 1.4 but doesn't
- * export the extension string. The stencil-wrap modes are a required
- * part of GL 1.4.
- */
-
- ver_str = (char *) glGetString( GL_VERSION );
- version = (ver_str == NULL) ? 1.0 : atof( ver_str );
-
- wrapping = (glutExtensionSupported("GL_EXT_stencil_wrap") || (version >= 1.4));
- if (!wrapping)
- printf("GL_EXT_stencil_wrap not supported. Only testing the rest.\n");
-}
-
-
-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]);
- glewInit();
- glutReshapeFunc( Reshape );
- glutKeyboardFunc( Key );
- glutDisplayFunc( Display );
- Init();
- glutMainLoop();
- return 0;
-}
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