tests/general/scissor-clear.c

   1 /*
   2  * Copyright © 2009 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  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 /** @file scissor-clear.c
  29  *
  30  * Tests that glScissor properly affects glClear(GL_COLOR_BUFFER_BIT)().
  31  */
  32
  33 #include "piglit-util.h"
  34
  35 int piglit_width = 100, piglit_height = 100;
  36 int piglit_window_mode = GLUT_DOUBLE | GLUT_RGB;
  37
  38 enum piglit_result
  39 piglit_display(void)
  40 {
  41         GLboolean pass = GL_TRUE;
  42         int x, y;
  43         static float green[] = {0.0, 1.0, 0.0, 0.0};
  44         static float blue[]  = {0.0, 0.0, 1.0, 0.0};
  45
  46         /* whole window green. */
  47         glClearColor(0.0, 1.0, 0.0, 0.0);
  48         glClear(GL_COLOR_BUFFER_BIT);
  49
  50         /* Clear depth quad at 10, 10 to be drawn blue. */
  51         glEnable(GL_SCISSOR_TEST);
  52         glScissor(10, 10, 10, 10);
  53         glClearColor(0.0, 0.0, 1.0, 0.0);
  54         glClear(GL_COLOR_BUFFER_BIT);
  55
  56         for (y = 0; y < piglit_height; y++) {
  57                 for (x = 0; x < piglit_width; x++) {
  58                         float *expected;
  59
  60                         if (x >= 10 && x < 20 && y >= 10 && y < 20)
  61                                 expected = blue;
  62                         else
  63                                 expected = green;
  64
  65                         pass &= piglit_probe_pixel_rgb(x, y, expected);
  66                 }
  67         }
  68
  69         glutSwapBuffers();
  70
  71         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
  72 }
  73
  74
  75 static void reshape(int width, int height)
  76 {
  77         piglit_width = width;
  78         piglit_height = height;
  79
  80         glViewport(0, 0, width, height);
  81         glMatrixMode(GL_PROJECTION);
  82         glLoadIdentity();
  83
  84         glOrtho(0.0, width, 0.0, height, -1.0, 1.0);
  85         glMatrixMode(GL_MODELVIEW);
  86         glLoadIdentity();
  87 }
  88
  89 void
  90 piglit_init(int argc, char **argv)
  91 {
  92         reshape(piglit_width, piglit_height);
  93 }