tests/bugs/point-sprite.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 whether
  26  * the correct colors were drawn using piglit_probe_pixel_rgb.
  27  *
  28  * \author Ben Holmes
  29  */
  30
  31 #include "piglit-util.h"
  32 #include "piglit-framework.h"
  33
  34 #define BOX_SIZE 64
  35 #define TEST_COLS 6
  36 #define TEST_ROWS 2
  37
  38 int piglit_window_mode = GLUT_DOUBLE | GLUT_RGB;
  39 int piglit_width = 1 + ((BOX_SIZE + 1) * TEST_COLS);
  40 int piglit_height = 1 + ((BOX_SIZE + 1) * TEST_ROWS);
  41
  42 static float maxSize = 0.0f;
  43 static GLuint tex;
  44 static const GLfloat black[4] = {0.0, 0.0, 0.0, 1.0};
  45 static const GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
  46
  47 void
  48 piglit_init(int argc, char **argv)
  49 {
  50         GLfloat realMaxSize;
  51
  52         (void) argc;
  53         (void) argv;
  54
  55         piglit_require_extension("GL_ARB_point_sprite");
  56
  57         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  58
  59         glEnable(GL_TEXTURE_2D);
  60         glEnable(GL_POINT_SPRITE_ARB);
  61
  62         glGetFloatv(GL_POINT_SIZE_MAX, &realMaxSize);
  63         maxSize = (realMaxSize > BOX_SIZE) ? BOX_SIZE : realMaxSize;
  64
  65         glClearColor(0.2, 0.2, 0.2, 1.0);
  66         glColor3f(1.0, 1.0, 1.0);
  67
  68         tex = piglit_checkerboard_texture(0, 0, 2, 2, 1, 1, black, white);
  69         glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_TRUE);
  70
  71         if (!piglit_automatic)
  72                 printf("Maximum point size is %f, using %f\n",
  73                        realMaxSize, maxSize);
  74 }
  75
  76 enum piglit_result
  77 piglit_display(void)
  78 {
  79         static const GLenum origins[2] = { GL_UPPER_LEFT, GL_LOWER_LEFT };
  80         const unsigned num_rows = (GLEW_VERSION_2_0) ? 2 : 1;
  81         GLboolean pass = GL_TRUE;
  82         unsigned i;
  83         unsigned j;
  84
  85         glClear(GL_COLOR_BUFFER_BIT);
  86         glBindTexture(GL_TEXTURE_2D, tex);
  87
  88         for (i = 0; i < num_rows; i++) {
  89                 const float y = 1 + (BOX_SIZE / 2) + (i * (BOX_SIZE + 1));
  90                 const float *const upper_left = (origins[i] == GL_UPPER_LEFT)
  91                         ? black : white;
  92                 const float *const lower_left = (origins[i] == GL_UPPER_LEFT)
  93                         ? white : black;
  94
  95                 /* OpenGL version must be at least 2.0 to support modifying
  96                  * GL_POINT_SPRITE_COORD_ORIGIN.
  97                  */
  98                 if (GLEW_VERSION_2_0)
  99                         glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN,
 100                                           origins[i]);
 101
 102                 for (j = 0; j < TEST_COLS; j++) {
 103                         const float x = 1 + (BOX_SIZE / 2)
 104                                 + (j * (BOX_SIZE + 1));
 105                         const float size = maxSize / (float) (1 << j);
 106
 107                         /* If the point size is too small, there won't be
 108                          * enough pixels drawn for the tests (below).
 109                          */
 110                         if (size < 2.0)
 111                                 continue;
 112
 113                         glPointSize(size - 0.2);
 114                         glBegin(GL_POINTS);
 115                         glTexCoord2f(1.5, 1.5);
 116                         glVertex2f(x, y);
 117                         glEnd();
 118
 119                         if (!piglit_probe_pixel_rgb(x - (size / 4),
 120                                                     y + (size / 4),
 121                                                     upper_left)
 122                             || !piglit_probe_pixel_rgb(x - (size / 4),
 123                                                        y - (size / 4),
 124                                                        lower_left)
 125                             || !piglit_probe_pixel_rgb(x + (size / 4),
 126                                                        y + (size / 4),
 127                                                        lower_left)
 128                             || !piglit_probe_pixel_rgb(x + (size / 4),
 129                                                        y - (size / 4),
 130                                                        upper_left)) {
 131                                 if (!piglit_automatic)
 132                                         printf("  size = %.3f, "
 133                                                "origin = %s left\n",
 134                                                size,
 135                                                (origins[i] == GL_UPPER_LEFT)
 136                                                ? "upper" : "lower");
 137                                 pass = GL_FALSE;
 138                         }
 139                 }
 140         }
 141
 142         glutSwapBuffers();
 143
 144         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 145 }