tests/glx/glx-visuals-stencil.c

   1 /*
   2  * Copyright © 2011 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 /**
  29  * @file glx-visuals-stencil.c
  30  *
  31  * Tests that when a stencil buffer is reported as present in the GLX
  32  * visual that it behaves appropriately (can set a value in it with
  33  * drawing, and use the stencil test on that value), and that when a
  34  * stencil buffer is not present the stencil test always passes even
  35  * if we try to enable it.
  36  */
  37
  38 #include "piglit-util-gl.h"
  39 #include "piglit-glx-util.h"
  40
  41 int piglit_width = 20;
  42 int piglit_height = 20;
  43
  44 enum piglit_result
  45 draw(Display *dpy, GLXFBConfig config)
  46 {
  47         int sbits;
  48         float green[3] = {0.0, 1.0, 0.0};
  49         float blue[3] = {0.0, 0.0, 1.0};
  50         float *left, *right;
  51         bool pass = true;
  52
  53         piglit_dispatch_default_init(PIGLIT_DISPATCH_GL);
  54         glXGetFBConfigAttrib(dpy, config, GLX_STENCIL_SIZE, &sbits);
  55
  56         piglit_ortho_projection(piglit_width, piglit_height, false);
  57
  58         glEnable(GL_STENCIL_TEST);
  59
  60         /* Set half the FB to stencil value 0, half to 1, and everything blue */
  61         glColor3fv(blue);
  62         glStencilFunc(GL_ALWAYS, 0, ~0);
  63         glStencilOp(GL_REPLACE, GL_REPLACE, GL_REPLACE);
  64         piglit_draw_rect(0, 0,
  65                          piglit_width / 2, piglit_height);
  66         glStencilFunc(GL_ALWAYS, 1, ~0);
  67         piglit_draw_rect(piglit_width / 2, 0,
  68                          piglit_width, piglit_height);
  69
  70         /* Now draw a rect trying to set just the 1 values to green. */
  71         glColor3fv(green);
  72         glStencilFunc(GL_EQUAL, 1, ~0);
  73         glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
  74         piglit_draw_rect(0, 0, piglit_width, piglit_height);
  75
  76         /* If there was a stencil buffer, then we get half the window
  77          * set to green.  Otherwise, the stencil test always passes
  78          * and the whole thing should have been set green.
  79          */
  80         if (sbits) {
  81                 left = blue;
  82                 right = green;
  83         } else {
  84                 left = green;
  85                 right = green;
  86         }
  87
  88         pass = pass && piglit_probe_rect_rgb(0, 0,
  89                                              piglit_width / 2, piglit_height,
  90                                              left);
  91         pass = pass && piglit_probe_rect_rgb(piglit_width / 2, 0,
  92                                              piglit_width - piglit_width / 2,
  93                                              piglit_height,
  94                                              right);
  95
  96         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  97 }
  98
  99 int
 100 main(int argc, char **argv)
 101 {
 102         enum piglit_result result;
 103
 104         for (int i = 1; i < argc; i++) {
 105                 if (!strcmp(argv[i], "-auto"))
 106                         piglit_automatic = 1;
 107                 else
 108                         fprintf(stderr, "Unknown option: %s\n", argv[i]);
 109         }
 110
 111         if (argc > 1 && strcmp(argv[1], "-pixmap") == 0)
 112                 result = piglit_glx_iterate_pixmap_fbconfigs(draw);
 113         else
 114                 result = piglit_glx_iterate_visuals(draw);
 115
 116         piglit_report_result(result);
 117
 118         return 0; /* UNREACHED */
 119 }