tests/fast_color_clear/front-buffer-distraction.c

   1 /*
   2  * Copyright © 2013 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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * \file front-buffer-distraction.c
  26  *
  27  * Test that a fast color clear of the back buffer is properly
  28  * resolved even if we try to "distract" the implementation by forcing
  29  * a fast color clear resolve in the front buffer.  This verifies that
  30  * either (a) fast color clears are independently tracked between the
  31  * front and back buffers, or (b) the implementation resolves fast
  32  * clears before switching from back buffer rendering to front buffer
  33  * rendering.
  34  *
  35  * The test operates by fast clearing the back buffer, then fast
  36  * clearing the front buffer, then reading from the front buffer
  37  * (forcing a front buffer resolve), then reading from the back buffer
  38  * (forcing a back buffer resolve).
  39  */
  40
  41 #include "piglit-util-gl.h"
  42
  43 PIGLIT_GL_TEST_CONFIG_BEGIN
  44         config.supports_gl_compat_version = 11;
  45         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  46         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  47 PIGLIT_GL_TEST_CONFIG_END
  48
  49
  50 void
  51 piglit_init(int argc, char **argv)
  52 {
  53 }
  54
  55 enum piglit_result
  56 piglit_display(void)
  57 {
  58         bool pass = true;
  59         static const GLfloat green[] = { 0.0, 1.0, 0.0, 1.0 };
  60         static const GLfloat red[] = { 1.0, 0.0, 0.0, 1.0 };
  61
  62         /* Clear the back buffer to green */
  63         glClearColor(0, 1, 0, 1);
  64         glClear(GL_COLOR_BUFFER_BIT);
  65
  66         /* Clear the front buffer to red */
  67         glDrawBuffer(GL_FRONT);
  68         glClearColor(1, 0, 0, 1);
  69         glClear(GL_COLOR_BUFFER_BIT);
  70         glDrawBuffer(GL_BACK);
  71
  72         /* Read from the front buffer and make sure that it's red */
  73         glReadBuffer(GL_FRONT);
  74         pass = piglit_probe_rect_rgba(0, 0, piglit_width,
  75                                       piglit_height, red) && pass;
  76         glReadBuffer(GL_BACK);
  77
  78         /* Read from the back buffer and make sure that it's green */
  79         pass = piglit_probe_rect_rgba(0, 0, piglit_width,
  80                                       piglit_height, green) && pass;
  81
  82         if (!piglit_check_gl_error(GL_NO_ERROR))
  83                 pass = false;
  84
  85         piglit_present_results();
  86         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  87 }