void enable_shadow_stencil() {
assert(have_EXT_stencil_wrap());
if (have_EXT_stencil_two_side()) {
glEnable(GL_STENCIL_TEST_TWO_SIDE_EXT);
glActiveStencilFaceEXT(GL_BACK);
glStencilFunc(GL_ALWAYS, 1, ~0U);
glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP);
glActiveStencilFaceEXT(GL_FRONT);
glStencilFunc(GL_ALWAYS, 1, ~0U);
glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP);
} else if (have_ATI_separate_stencil()) {
glStencilFuncSeparateATI( GL_ALWAYS, GL_ALWAYS, 1, ~0U );
glStencilOpSeparateATI( GL_BACK, GL_KEEP, GL_KEEP, GL_INCR_WRAP );
glStencilOpSeparateATI( GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR_WRAP );
} else {
assert(0);
}
}
enum piglit_result
piglit_display(void)
{
GLboolean pass = GL_TRUE;
GLint max_stencil;
GLint stencil_bits;
unsigned i;
float expected[4] = {0.5, 0.5, 0.5, 0.5};
int w = piglit_width / (6 * 2 + 1);
int h = w;
int start_y = (piglit_height - h) / 2;
piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
glGetIntegerv(GL_STENCIL_BITS, & stencil_bits);
max_stencil = (1U << stencil_bits) - 1;
printf("Stencil bits = %u, maximum stencil value = 0x%08x\n",
stencil_bits, max_stencil);
glClearStencil(1);
glClearColor(0.2, 0.2, 0.8, 0);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT
| GL_STENCIL_BUFFER_BIT);
/* This is the "reference" square. */
glDisable(GL_STENCIL_TEST);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 1, start_y, w, h);
glEnable(GL_STENCIL_TEST);
/* Draw the first two squares using incr for the affected face
*/
/* 2nd square */
if (use20syntax) {
glStencilFuncSeparate(GL_FRONT, GL_ALWAYS, 0, ~0);
glStencilFuncSeparate(GL_BACK, GL_ALWAYS, 0, ~0);
glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR);
glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR);
}
else {
glStencilFuncSeparateATI(GL_ALWAYS, GL_ALWAYS, 0, ~0);
glStencilOpSeparateATI(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR);
glStencilOpSeparateATI(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR);
}
glColor3f(0.9, 0.9, 0.9);
for (i = 0 ; i < (max_stencil + 5) ; i++) {
/* this should be front facing */
piglit_draw_rect(w * 3, start_y, w, h);
}
/* stencil vals should be equal to max_stencil */
glStencilFunc(GL_EQUAL, max_stencil, ~0);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 3, start_y, w, h);
/* 3rd square */
if (use20syntax) {
glStencilFuncSeparate(GL_FRONT, GL_ALWAYS, 0, ~0);
glStencilFuncSeparate(GL_BACK, GL_ALWAYS, 0, ~0);
glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR);
glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR);
}
else {
glStencilFuncSeparateATI(GL_ALWAYS, GL_ALWAYS, 0, ~0);
glStencilOpSeparateATI(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR);
glStencilOpSeparateATI(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR);
}
glColor3f(0.9, 0.9, 0.9);
for (i = 0 ; i < (max_stencil + 5) ; i++) {
/* this should be back facing */
piglit_draw_rect(w * 5, start_y + h, w, -h);
}
/* stencil vals should be equal to max_stencil */
glStencilFunc(GL_EQUAL, max_stencil, ~0);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 5, start_y, w, h);
/* 4th square */
if (use20syntax) {
glStencilFuncSeparate(GL_FRONT, GL_NEVER, 0, ~0);
glStencilFuncSeparate(GL_BACK, GL_ALWAYS, 0, ~0);
glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR);
glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR);
}
else {
glStencilFuncSeparateATI(GL_NEVER, GL_ALWAYS, 0, ~0);
glStencilOpSeparateATI(GL_FRONT, GL_KEEP, GL_KEEP, GL_DECR);
glStencilOpSeparateATI(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR);
}
glColor3f(0.9, 0.9, 0.9);
for (i = 0 ; i < (max_stencil + 5) ; i++) {
/* this should be back facing */
piglit_draw_rect(w * 7, start_y + h, w, -h);
/* this should be front facing */
piglit_draw_rect(w * 7, start_y, w, h);
}
/* stencil vals should be equal to max_stencil */
glStencilFunc(GL_EQUAL, max_stencil, ~0);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 7, start_y, w, h);
/* 5th square */
if (use20syntax) {
glStencilFuncSeparate(GL_FRONT, GL_ALWAYS, 0, ~0);
glStencilFuncSeparate(GL_BACK, GL_ALWAYS, 0, ~0);
glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR);
glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR);
}
else {
glStencilFuncSeparateATI(GL_ALWAYS, GL_ALWAYS, 0, ~0);
glStencilOpSeparateATI(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR);
glStencilOpSeparateATI(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR);
}
glColor3f(0.9, 0.9, 0.9);
for (i = 0 ; i < (max_stencil + 5) ; i++) {
/* this should be back facing */
piglit_draw_rect(w * 9, start_y + h, w, -h);
/* this should be front facing */
piglit_draw_rect(w * 9, start_y, w, h);
}
glStencilFunc(GL_EQUAL, 1, ~0);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 9, start_y, w, h);
/* 6th square */
if (piglit_is_extension_supported("GL_EXT_stencil_wrap")) {
if (use20syntax) {
glStencilFuncSeparate(GL_FRONT, GL_ALWAYS, 0, ~0);
glStencilFuncSeparate(GL_BACK, GL_ALWAYS, 0, ~0);
glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_KEEP);
glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
}
else {
glStencilFuncSeparateATI(GL_ALWAYS, GL_ALWAYS, 0, ~0);
glStencilOpSeparateATI(GL_FRONT, GL_KEEP, GL_KEEP, GL_KEEP);
glStencilOpSeparateATI(GL_BACK, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
}
glColor3f(0.9, 0.9, 0.9);
for (i = 0 ; i < (max_stencil + 5) ; i++) {
/* this should be back facing */
piglit_draw_rect(w * 11, start_y + h, w, -h);
/* this should be front facing */
piglit_draw_rect(w * 11, start_y, w, h);
}
glStencilFunc(GL_EQUAL, 260 - 255, ~0);
glColor3f(0.5, 0.5, 0.5);
piglit_draw_rect(w * 11, start_y, w, h);
}
pass = piglit_probe_pixel_rgb(w * 1.5, piglit_height / 2, expected);
pass = piglit_probe_pixel_rgb(w * 3.5, piglit_height / 2, expected);
pass = piglit_probe_pixel_rgb(w * 5.5, piglit_height / 2, expected);
pass = piglit_probe_pixel_rgb(w * 7.5, piglit_height / 2, expected);
pass = piglit_probe_pixel_rgb(w * 9.5, piglit_height / 2, expected);
pass = piglit_probe_pixel_rgb(w * 11.5, piglit_height / 2, expected);
glutSwapBuffers();
return pass ? PIGLIT_PASS : PIGLIT_FAIL;
}
