tests/spec/nv_conditional_render/clear.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 #include "piglit-util-gl.h"
  25
  26 /**
  27  * @file clear.c
  28  *
  29  * Tests that conditional rendering appropriately affects glClear().
  30  *
  31  * From the NV_conditional_render spec:
  32  *
  33  *     "If the result (SAMPLES_PASSED) of the query is zero, all
  34  *      rendering commands between BeginConditionalRenderNV and the
  35  *      corresponding EndConditionalRenderNV are discarded.  In this
  36  *      case, Begin, End, all vertex array commands performing an
  37  *      implicit Begin and End, DrawPixels (section 3.6), Bitmap
  38  *      (section 3.7), Clear (section 4.2.3), Accum (section 4.2.4),
  39  *      CopyPixels (section 4.3.3), EvalMesh1, and EvalMesh2 (section
  40  *      5.1) have no effect."
  41  */
  42
  43 PIGLIT_GL_TEST_CONFIG_BEGIN
  44
  45         config.supports_gl_compat_version = 10;
  46         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  47         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  48
  49 PIGLIT_GL_TEST_CONFIG_END
  50
  51 enum piglit_result
  52 piglit_display(void)
  53 {
  54         bool pass = true;
  55         float green[4] = {0.0, 1.0, 0.0, 0.0};
  56         GLuint q;
  57
  58         glClearColor(0.5, 0.5, 0.5, 0.5);
  59         glClear(GL_COLOR_BUFFER_BIT);
  60
  61         glGenQueries(1, &q);
  62
  63         /* Generate query pass: draw top half of screen. */
  64         glColor4f(0.0, 1.0, 0.0, 0.0);
  65         glBeginQuery(GL_SAMPLES_PASSED, q);
  66         piglit_draw_rect(-1, 0, 2, 1);
  67         glEndQuery(GL_SAMPLES_PASSED);
  68
  69         /* Conditional render that should draw bottom half of screen. */
  70         glBeginConditionalRenderNV(q, GL_QUERY_WAIT_NV);
  71         glClearColor(0.0, 1.0, 0.0, 0.0);
  72         glClear(GL_COLOR_BUFFER_BIT);
  73         glEndConditionalRenderNV();
  74
  75         /* Generate query fail */
  76         glBeginQuery(GL_SAMPLES_PASSED, q);
  77         glEndQuery(GL_SAMPLES_PASSED);
  78
  79         /* Conditional render that should not draw full screen. */
  80         glBeginConditionalRenderNV(q, GL_QUERY_WAIT_NV);
  81         glClearColor(1.0, 0.0, 0.0, 0.0);
  82         glClear(GL_COLOR_BUFFER_BIT);
  83         glEndConditionalRenderNV();
  84
  85         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height,
  86                                       green);
  87
  88         piglit_present_results();
  89
  90         glDeleteQueries(1, &q);
  91
  92         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  93 }
  94
  95 void
  96 piglit_init(int argc, char **argv)
  97 {
  98         piglit_require_gl_version(20);
  99
 100         piglit_require_extension("GL_NV_conditional_render");
 101 }