tests/spec/arb_point_sprite/checkerboard.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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23
  24 /**
  25  * This test draws a point sprite with a checkerboard texture and tests
  26  * whether the correct colors were drawn using piglit_probe_pixel_rgb.
  27  *
  28  * \author Ben Holmes
  29  */
  30
  31 #include "piglit-util-gl.h"
  32
  33 #define BOX_SIZE 64
  34 #define TEST_COLS 6
  35 #define TEST_ROWS 2
  36
  37 PIGLIT_GL_TEST_CONFIG_BEGIN
  38
  39         config.supports_gl_compat_version = 10;
  40
  41         config.window_width = 1+((BOX_SIZE+1)*TEST_COLS);
  42         config.window_height = 1+((BOX_SIZE+1)*TEST_ROWS);
  43         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  44         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  45
  46 PIGLIT_GL_TEST_CONFIG_END
  47
  48 static float maxSize = 0.0f;
  49 static GLuint tex;
  50 static const GLfloat black[4] = {0.0, 0.0, 0.0, 1.0};
  51 static const GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
  52
  53 void
  54 piglit_init(int argc, char **argv)
  55 {
  56         GLfloat realMaxSize;
  57
  58         (void) argc;
  59         (void) argv;
  60
  61         piglit_require_extension("GL_ARB_point_sprite");
  62
  63         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  64
  65         glEnable(GL_TEXTURE_2D);
  66         glEnable(GL_POINT_SPRITE_ARB);
  67
  68         glGetFloatv(GL_POINT_SIZE_MAX, &realMaxSize);
  69         maxSize = (realMaxSize > BOX_SIZE) ? BOX_SIZE : realMaxSize;
  70
  71         glClearColor(0.2, 0.2, 0.2, 1.0);
  72         glColor3f(1.0, 1.0, 1.0);
  73
  74         tex = piglit_checkerboard_texture(0, 0, 2, 2, 1, 1, black, white);
  75         glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_TRUE);
  76
  77         if (!piglit_automatic)
  78                 printf("Maximum point size is %f, using %f\n",
  79                        realMaxSize, maxSize);
  80 }
  81
  82 enum piglit_result
  83 piglit_display(void)
  84 {
  85         static const GLenum origins[2] = { GL_UPPER_LEFT, GL_LOWER_LEFT };
  86         const unsigned num_rows = (piglit_get_gl_version() >= 20) ? 2 : 1;
  87         GLboolean pass = GL_TRUE;
  88         unsigned i;
  89         unsigned j;
  90
  91         glClear(GL_COLOR_BUFFER_BIT);
  92         glBindTexture(GL_TEXTURE_2D, tex);
  93
  94         for (i = 0; i < num_rows; i++) {
  95                 const float y = 1 + (BOX_SIZE / 2) + (i * (BOX_SIZE + 1));
  96                 const float *const upper_left = (origins[i] == GL_UPPER_LEFT)
  97                         ? black : white;
  98                 const float *const lower_left = (origins[i] == GL_UPPER_LEFT)
  99                         ? white : black;
 100
 101                 /* OpenGL version must be at least 2.0 to support modifying
 102                  * GL_POINT_SPRITE_COORD_ORIGIN.
 103                  */
 104                 if (piglit_get_gl_version() >= 20)
 105                         glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN,
 106                                           origins[i]);
 107
 108                 for (j = 0; j < TEST_COLS; j++) {
 109                         const float x = 1 + (BOX_SIZE / 2)
 110                                 + (j * (BOX_SIZE + 1));
 111                         const float size = maxSize / (float) (1 << j);
 112
 113                         /* If the point size is too small, there won't be
 114                          * enough pixels drawn for the tests (below).
 115                          */
 116                         if (size < 2.0)
 117                                 continue;
 118
 119                         glPointSize(size - 0.2);
 120                         glBegin(GL_POINTS);
 121                         glTexCoord2f(1.5, 1.5);
 122                         glVertex2f(x, y);
 123                         glEnd();
 124
 125                         if (!piglit_probe_pixel_rgb(x - (size / 4),
 126                                                     y + (size / 4),
 127                                                     upper_left)
 128                             || !piglit_probe_pixel_rgb(x - (size / 4),
 129                                                        y - (size / 4),
 130                                                        lower_left)
 131                             || !piglit_probe_pixel_rgb(x + (size / 4),
 132                                                        y + (size / 4),
 133                                                        lower_left)
 134                             || !piglit_probe_pixel_rgb(x + (size / 4),
 135                                                        y - (size / 4),
 136                                                        upper_left)) {
 137                                 if (!piglit_automatic)
 138                                         printf("  size = %.3f, "
 139                                                "origin = %s left\n",
 140                                                size,
 141                                                (origins[i] == GL_UPPER_LEFT)
 142                                                ? "upper" : "lower");
 143                                 pass = GL_FALSE;
 144                         }
 145                 }
 146         }
 147
 148         piglit_present_results();
 149
 150         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 151 }