tests/general/scissor-stencil-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-stencil-clear.c
  29  *
  30  * Tests that glScissor properly affects glClear of the stencil buffer.
  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 | GLUT_DEPTH | GLUT_STENCIL;
  37
  38 enum piglit_result
  39 piglit_display(void)
  40 {
  41         GLboolean pass = GL_TRUE;
  42         int x, y;
  43         static float red[]   = {1.0, 0.0, 0.0, 0.0};
  44         static float green[] = {0.0, 1.0, 0.0, 0.0};
  45         static float blue[]  = {0.0, 0.0, 1.0, 0.0};
  46
  47         /* whole window gray -- none should be visible */
  48         glClearColor(0.5, 0.5, 0.5, 0.0);
  49         glClear(GL_COLOR_BUFFER_BIT);
  50
  51         /* Clear stencil to 0, which will be drawn green */
  52         glClearStencil(0);
  53         glClear(GL_STENCIL_BUFFER_BIT);
  54
  55         /* quad at 10, 10 that will be drawn blue. */
  56         glEnable(GL_SCISSOR_TEST);
  57         glScissor(10, 10, 10, 10);
  58         glClearStencil(1);
  59         glClear(GL_STENCIL_BUFFER_BIT);
  60
  61         /* 0-sized quad at 10, 30 that shouldn't be drawn (red) */
  62         glScissor(10, 30, 0, 0);
  63         glClearStencil(2);
  64         glClear(GL_STENCIL_BUFFER_BIT);
  65
  66         glDisable(GL_SCISSOR_TEST);
  67         glEnable(GL_STENCIL_TEST);
  68         glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
  69
  70         /* First quad -- stencil == 0 gets green */
  71         glStencilFunc(GL_EQUAL, 0, ~0);
  72         glColor4fv(green);
  73         piglit_draw_rect(0, 0, piglit_width, piglit_height);
  74
  75         /* Second quad -- stencil == 1 gets blue */
  76         glStencilFunc(GL_EQUAL, 1, ~0);
  77         glColor4fv(blue);
  78         piglit_draw_rect(0, 0, piglit_width, piglit_height);
  79
  80         /* Last quad -- stencil == 2 gets red (shouldn't occur!) */
  81         glStencilFunc(GL_EQUAL, 2, ~0);
  82         glColor4fv(red);
  83         piglit_draw_rect(0, 0, piglit_width, piglit_height);
  84
  85         for (y = 0; y < piglit_height; y++) {
  86                 for (x = 0; x < piglit_width; x++) {
  87                         float *expected;
  88
  89                         if (x >= 10 && x < 20 && y >= 10 && y < 20)
  90                                 expected = blue;
  91                         else
  92                                 expected = green;
  93
  94                         pass &= piglit_probe_pixel_rgb(x, y, expected);
  95                 }
  96         }
  97
  98         glutSwapBuffers();
  99
 100         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 101 }
 102
 103
 104 static void reshape(int width, int height)
 105 {
 106         piglit_width = width;
 107         piglit_height = height;
 108
 109         piglit_ortho_projection(width, height, GL_FALSE);
 110 }
 111
 112 void
 113 piglit_init(int argc, char **argv)
 114 {
 115         reshape(piglit_width, piglit_height);
 116 }