tests/general/stencil-drawpixels.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 stencil-drawpixels.c
  29  *
  30  * Tests that glDrawPixels(GL_STENCIL) minimally works.
  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, i;
  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         static float square[100];
  47
  48         /* whole window gray -- none should be visible */
  49         glClearColor(0.5, 0.5, 0.5, 0.0);
  50         glClear(GL_COLOR_BUFFER_BIT);
  51
  52         /* Clear stencil to 0, which will be drawn red */
  53         glClearStencil(0);
  54         glClear(GL_STENCIL_BUFFER_BIT);
  55
  56         /* quad at 10, 10 that will be drawn green. */
  57         for (i = 0; i < 100; i++)
  58                 square[i] = 1.0;
  59         glRasterPos2i(10, 10);
  60         glDrawPixels(10, 10, GL_STENCIL_INDEX, GL_FLOAT, square);
  61
  62         /* quad at 30, 10 that will be drawn blue. */
  63         for (i = 0; i < 100; i++)
  64                 square[i] = 2.0;
  65         glRasterPos2i(30, 10);
  66         glDrawPixels(10, 10, GL_STENCIL_INDEX, GL_FLOAT, square);
  67
  68         glDisable(GL_SCISSOR_TEST);
  69         glEnable(GL_STENCIL_TEST);
  70         glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
  71
  72         /* First quad -- stencil == 0 gets red */
  73         glStencilFunc(GL_EQUAL, 0, ~0);
  74         glColor4fv(red);
  75         piglit_draw_rect(0, 0, piglit_width, piglit_height);
  76
  77         /* Second quad -- stencil == 1 gets green */
  78         glStencilFunc(GL_EQUAL, 1, ~0);
  79         glColor4fv(green);
  80         piglit_draw_rect(0, 0, piglit_width, piglit_height);
  81
  82         /* Last quad -- stencil == 2 gets blue */
  83         glStencilFunc(GL_EQUAL, 2, ~0);
  84         glColor4fv(blue);
  85         piglit_draw_rect(0, 0, piglit_width, piglit_height);
  86
  87         assert(glGetError() == 0);
  88
  89         for (y = 0; y < piglit_height; y++) {
  90                 for (x = 0; x < piglit_width; x++) {
  91                         float *expected;
  92
  93                         if (x >= 10 && x < 20 && y >= 10 && y < 20)
  94                                 expected = green;
  95                         else if (x >= 30 && x < 40 && y >= 10 && y < 20)
  96                                 expected = blue;
  97                         else
  98                                 expected = red;
  99
 100                         pass &= piglit_probe_pixel_rgb(x, y, expected);
 101                 }
 102         }
 103
 104         glutSwapBuffers();
 105
 106         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 107 }
 108
 109
 110 static void reshape(int width, int height)
 111 {
 112         piglit_width = width;
 113         piglit_height = height;
 114
 115         glViewport(0, 0, width, height);
 116
 117         piglit_ortho_projection(width, height, GL_FALSE);
 118 }
 119
 120 void
 121 piglit_init(int argc, char **argv)
 122 {
 123         reshape(piglit_width, piglit_height);
 124 }