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; }