tests/general/stencil-wrap.c

   1 /*
   2  * (C) Copyright IBM Corporation 2004
   3  * All Rights Reserved.
   4  *
   5  * Permission is hereby granted, free of charge, to any person obtaining a
   6  * copy of this software and associated documentation files (the "Software"),
   7  * to deal in the Software without restriction, including without limitation
   8  * on the rights to use, copy, modify, merge, publish, distribute, sub
   9  * license, and/or sell copies of the Software, and to permit persons to whom
  10  * the Software is furnished to do so, subject to the following conditions:
  11  *
  12  * The above copyright notice and this permission notice (including the next
  13  * paragraph) shall be included in all copies or substantial portions of the
  14  * Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
  19  * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
  22  * USE OR OTHER DEALINGS IN THE SOFTWARE.
  23  */
  24
  25 /**
  26  * \file stencil_wrap.c
  27  *
  28  * Simple test of GL_EXT_stencil_wrap functionality.  Four squares are drawn
  29  * with different stencil modes, but all should be rendered with the same
  30  * final color.
  31  *
  32  * \author Ian Romanick <idr@us.ibm.com>
  33  */
  34
  35 #include "piglit-util-gl.h"
  36
  37 PIGLIT_GL_TEST_CONFIG_BEGIN
  38
  39         config.supports_gl_compat_version = 10;
  40
  41         config.window_width = 550;
  42         config.window_height = 200;
  43         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_DEPTH | PIGLIT_GL_VISUAL_STENCIL;
  44
  45 PIGLIT_GL_TEST_CONFIG_END
  46
  47 enum piglit_result
  48 piglit_display(void)
  49 {
  50         GLint  max_stencil;
  51         GLint  stencil_bits;
  52         unsigned i;
  53         GLboolean pass = GL_TRUE;
  54         float expected[4] = {0.5, 0.5, 0.5, 0.5};
  55         int w = piglit_width / (5 * 2 + 1);
  56         int h = w;
  57         int start_y = (piglit_height - h) / 2;
  58
  59         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  60
  61         glGetIntegerv(GL_STENCIL_BITS, & stencil_bits);
  62         max_stencil = (1U << stencil_bits) - 1;
  63         printf("Stencil bits = %u, maximum stencil value = 0x%08x\n",
  64                 stencil_bits, max_stencil);
  65
  66         glClearStencil(0);
  67         glClearColor(0.2, 0.2, 0.8, 0);
  68         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT |
  69                 GL_STENCIL_BUFFER_BIT);
  70
  71         /* This is the "reference" square.
  72          */
  73
  74         glDisable(GL_STENCIL_TEST);
  75         glColor3f(0.5, 0.5, 0.5);
  76         piglit_draw_rect(w * 1, start_y, w, h);
  77
  78         glEnable(GL_STENCIL_TEST);
  79
  80         /* Draw the first two squares using the two non-wrap (i.e., saturate)
  81          * modes.
  82          */
  83
  84         glStencilFunc(GL_ALWAYS, 0, ~0);
  85         glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
  86
  87         glColor3f(0.9, 0.9, 0.9);
  88
  89         for (i = 0 ; i < (max_stencil + 5) ; i++) {
  90                 piglit_draw_rect(w * 3, start_y, w, h);
  91         }
  92
  93         glStencilFunc(GL_EQUAL, max_stencil, ~0);
  94         glColor3f(0.5, 0.5, 0.5);
  95         piglit_draw_rect(w * 3, start_y, w, h);
  96
  97         glStencilFunc(GL_ALWAYS, 0, ~0);
  98         glStencilOp(GL_KEEP, GL_KEEP, GL_DECR);
  99
 100         glColor3f(0.9, 0.9, 0.9);
 101
 102         for (i = 0 ; i < (max_stencil + 5) ; i++) {
 103                 piglit_draw_rect(w * 5, start_y, w, h);
 104         }
 105
 106         glStencilFunc(GL_EQUAL, 0, ~0);
 107         glColor3f(0.5, 0.5, 0.5);
 108         piglit_draw_rect(w * 5, start_y, w, h);
 109
 110         /* Draw the last two squares using the two wrap modes.
 111          */
 112
 113         glStencilFunc(GL_ALWAYS, 0, ~0);
 114         glStencilOp(GL_KEEP, GL_KEEP, GL_INCR_WRAP);
 115
 116         glColor3f(0.9, 0.9, 0.9);
 117
 118         for (i = 0 ; i < (max_stencil + 5) ; i++) {
 119                 piglit_draw_rect(w * 7, start_y, w, h);
 120         }
 121
 122         glStencilFunc(GL_EQUAL, 4, ~0);
 123         glColor3f(0.5, 0.5, 0.5);
 124         piglit_draw_rect(w * 7, start_y, w, h);
 125
 126         glStencilFunc(GL_ALWAYS, 0, ~0);
 127         glStencilOp(GL_KEEP, GL_KEEP, GL_DECR_WRAP);
 128
 129         glColor3f(0.9, 0.9, 0.9);
 130
 131         for (i = 0 ; i < 5 ; i++) {
 132                 piglit_draw_rect(w * 9, start_y, w, h);
 133         }
 134
 135         glStencilFunc(GL_EQUAL, (max_stencil - 4), ~0);
 136         glColor3f(0.5, 0.5, 0.5);
 137         piglit_draw_rect(w * 9, start_y, w, h);
 138
 139         pass = piglit_probe_pixel_rgb(w * 1.5, piglit_height / 2, expected) && pass;
 140         pass = piglit_probe_pixel_rgb(w * 3.5, piglit_height / 2, expected) && pass;
 141         pass = piglit_probe_pixel_rgb(w * 5.5, piglit_height / 2, expected) && pass;
 142         pass = piglit_probe_pixel_rgb(w * 7.5, piglit_height / 2, expected) && pass;
 143         pass = piglit_probe_pixel_rgb(w * 9.5, piglit_height / 2, expected) && pass;
 144
 145         piglit_present_results();
 146
 147         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 148 }
 149
 150 void
 151 piglit_init(int argc, char **argv)
 152 {
 153         if (!piglit_is_extension_supported("GL_EXT_stencil_wrap") && piglit_get_gl_version() < 14) {
 154                 printf("Sorry, this program requires either "
 155                        "GL_EXT_stencil_wrap or OpenGL 1.4.\n");
 156                 piglit_report_result(PIGLIT_SKIP);
 157         }
 158
 159         printf("\nAll 5 squares should be the same color.\n");
 160         glEnable(GL_BLEND);
 161 }