tests/general/roundmode-pixelstore.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
  24 /**
  25  * @file roundmode-pixelstore.c
  26  *
  27  * Tests that the floating point rounding mode doesn't impact
  28  * glPixelStore's rounding behavior.
  29  *
  30  * From the GL 2.1 specification, page 114 (page 128 of the PDF):
  31  *
  32  *     "The version of PixelStore that takes a floating-point value
  33  *      may be used to set any type of parameter; if the parameter is
  34  *      boolean, then it is set to FALSE if the passed value is 0.0
  35  *      and TRUE otherwise, while if the parameter is an integer, then
  36  *      the passed value is rounded to the nearest integer."
  37  */
  38
  39 #include "piglit-util-gl.h"
  40
  41 #include <fenv.h>
  42
  43 PIGLIT_GL_TEST_CONFIG_BEGIN
  44
  45         config.supports_gl_compat_version = 10;
  46
  47         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE;
  48
  49         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  50
  51 PIGLIT_GL_TEST_CONFIG_END
  52
  53 enum piglit_result
  54 piglit_display(void)
  55 {
  56         /* UNREACHED */
  57         return PIGLIT_FAIL;
  58 }
  59
  60 static bool
  61 test(float val, int expect)
  62 {
  63         GLint out;
  64
  65         glPixelStoref(GL_UNPACK_ROW_LENGTH, val);
  66         glGetIntegerv(GL_UNPACK_ROW_LENGTH, &out);
  67
  68         if (out != expect) {
  69                 printf("Set row length to %.1f, expected %d, got %d\n",
  70                        val, expect, out);
  71                 return false;
  72         } else {
  73                 printf("Set row length to %.1f and got %d\n", val, out);
  74         }
  75
  76         return true;
  77 }
  78
  79 void
  80 piglit_init(int argc, char **argv)
  81 {
  82         bool pass = true;
  83
  84 #ifdef FE_UPWARD
  85         if (fesetround(FE_UPWARD) != 0) {
  86                 printf("Setting rounding mode failed\n");
  87                 piglit_report_result(PIGLIT_SKIP);
  88         }
  89 #else
  90         printf("Cannot set rounding mode\n");
  91         piglit_report_result(PIGLIT_SKIP);
  92 #endif
  93
  94         pass = test(2.2, 2) && pass;
  95         pass = test(2.8, 3) && pass;
  96         pass = test(-0.1, 0) && pass;
  97         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
  98
  99         if (!piglit_khr_no_error) {
 100                 printf("Setting row length -0.9, and expecting error\n");
 101                 glPixelStoref(GL_UNPACK_ROW_LENGTH, -0.9);
 102                 pass = piglit_check_gl_error(GL_INVALID_VALUE) && pass;
 103         }
 104
 105         piglit_report_result(pass ? PIGLIT_PASS : PIGLIT_FAIL);
 106 }
 107