tests/spec/arb_clip_control/viewport.c

   1 /*
   2  * Copyright (C) 2016 VMware, Inc.
   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  * Test glViewport behaviour with GL_ARB_clip_control.
  26  * The position of the viewport in window coordinates should not be
  27  * effected by the GL_CLIP_ORIGIN state.
  28  *
  29  * See https://bugs.freedesktop.org/show_bug.cgi?id=93813
  30  *
  31  * Brian Paul
  32  * 9 Feb 2016
  33  */
  34
  35 #include "piglit-util-gl.h"
  36
  37
  38 PIGLIT_GL_TEST_CONFIG_BEGIN
  39         config.supports_gl_compat_version = 20;
  40         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  41         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  42 PIGLIT_GL_TEST_CONFIG_END
  43
  44
  45 static const float red[3] = { 1, 0, 0 };
  46 static const float green[3] = { 0, 1, 0 };
  47 static const float blue[3] = { 0, 0, 1 };
  48 static const float white[3] = { 1, 1, 1 };
  49
  50
  51 void
  52 piglit_init(int argc, char **argv)
  53 {
  54         piglit_require_extension("GL_ARB_clip_control");
  55         glEnable(GL_CULL_FACE);
  56 }
  57
  58
  59 /**
  60  * Draw this pattern in the current viewport region, regardless of
  61  * the clip control settings:
  62  *
  63  *   +---------+---------+
  64  *   |         |         |
  65  *   |   blue  |  white  |
  66  *   |         |         |
  67  *   +---------+---------+
  68  *   |         |         |
  69  *   |   red   |  green  |
  70  *   |         |         |
  71  *   +---------+---------+
  72  *
  73  * \param invert_y - if true, NDC_Y=-1=top, else NDC_Y=-1=bottom
  74  */
  75 static void
  76 draw_test_pattern(bool invert_y)
  77 {
  78         /* Since the modelview and projection matrices are identity matrices,
  79          * we're effectively drawing in Normalized Device Coordinates which
  80          * range from [-1,1] in X and Y.
  81          *
  82          * Note: we're careful with our glRectf coordinates so that the
  83          * rect is drawn front-facing.  If a rect is not drawn it must be
  84          * because it was back-face culled by mistake.
  85          */
  86
  87         /* lower-left quadrant = red */
  88         glColor3fv(red);
  89         if (invert_y)
  90                 glRectf(-1, 0, 0, 1);
  91         else
  92                 glRectf(-1, -1, 0, 0);
  93
  94         /* lower-right quadrant = green */
  95         glColor3fv(green);
  96         if (invert_y)
  97                 glRectf(0, 0, 1, 1);
  98         else
  99                 glRectf(0, -1, 1, 0);
 100
 101         /* upper-left quadrant = blue */
 102         glColor3fv(blue);
 103         if (invert_y)
 104                 glRectf(-1, -1, 0, 0);
 105         else
 106                 glRectf(-1, 0, 0, 1);
 107
 108         /* upper-right quadrant = white */
 109         glColor3fv(white);
 110         if (invert_y)
 111                 glRectf(0, -1, 1, 0);
 112         else
 113                 glRectf(0, 0, 1, 1);
 114 }
 115
 116
 117 static bool
 118 check_test_pattern(int xpos, int ypos)
 119 {
 120         bool pass = true;
 121         int half_w = piglit_width / 2;
 122         int half_h = piglit_height / 2;
 123         /* coords in center of the color swatches */
 124         int x0 = xpos + half_w / 4;
 125         int y0 = ypos + half_h / 4;
 126         int x1 = xpos + half_w * 3 / 4;
 127         int y1 = ypos + half_h * 3 / 4;
 128
 129         if (!piglit_probe_pixel_rgb(x0, y0, red)) {
 130                 printf("wrong color in lower-left quadrant of test pattern\n");
 131                 pass = false;
 132         }
 133
 134         if (!piglit_probe_pixel_rgb(x1, y0, green)) {
 135                 printf("wrong color in lower-right quadrant of test pattern\n");
 136                 pass = false;
 137         }
 138
 139         if (!piglit_probe_pixel_rgb(x0, y1, blue)) {
 140                 printf("wrong color in upper-left quadrant of test pattern\n");
 141                 pass = false;
 142         }
 143
 144         if (!piglit_probe_pixel_rgb(x1, y1, white)) {
 145                 printf("wrong color in upper-right quadrant of test pattern\n");
 146                 pass = false;
 147         }
 148
 149         if (!pass) {
 150                 GLint origin;
 151                 glGetIntegerv(GL_CLIP_ORIGIN, &origin);
 152                 printf("GL_CLIP_ORIGIN = %s\n",
 153                        piglit_get_gl_enum_name(origin));
 154         }
 155
 156         return pass;
 157 }
 158
 159
 160 enum piglit_result
 161 piglit_display(void)
 162 {
 163         int half_w = piglit_width / 2;
 164         int half_h = piglit_height / 2;
 165         bool pass = true;
 166
 167         /* Test normal GL coordinates */
 168         glClipControl(GL_LOWER_LEFT, GL_NEGATIVE_ONE_TO_ONE);
 169         glClear(GL_COLOR_BUFFER_BIT);
 170
 171         /* Normal GL origin / Draw in upper-left screen quadrant */
 172         glViewport(0, half_h, half_w, half_h);
 173         draw_test_pattern(false);
 174         if (!check_test_pattern(0, half_h))
 175                 pass = false;
 176
 177         /* Normal GL origin / Draw in lower-right screen quadrant */
 178         glViewport(half_w, 0, half_w, half_h);
 179         draw_test_pattern(false);
 180         if (!check_test_pattern(half_w, 0))
 181                 pass = false;
 182
 183
 184         /* Test inverted GL coordinates */
 185         glClipControl(GL_UPPER_LEFT, GL_NEGATIVE_ONE_TO_ONE);
 186         glClear(GL_COLOR_BUFFER_BIT);
 187
 188         /* Inverted GL origin / Draw in upper-left screen quadrant */
 189         glViewport(0, half_h, half_w, half_h);
 190         draw_test_pattern(true);
 191         if (!check_test_pattern(0, half_h))
 192                 pass = false;
 193
 194         /* Inverted GL origin / Draw in lower-right screen quadrant */
 195         glViewport(half_w, 0, half_w, half_h);
 196         draw_test_pattern(true);
 197         if (!check_test_pattern(half_w, 0))
 198                 pass = false;
 199
 200         piglit_present_results();
 201
 202         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 203 }