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         config.supports_gl_es_version = 10;
  41
  42         config.window_width = 1+((BOX_SIZE+1)*TEST_COLS);
  43         config.window_height = 1+((BOX_SIZE+1)*TEST_ROWS);
  44         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  45         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  46
  47 PIGLIT_GL_TEST_CONFIG_END
  48
  49 static float maxSize = 0.0f;
  50 static GLuint tex;
  51 static const GLfloat black[4] = {0.0, 0.0, 0.0, 1.0};
  52 static const GLfloat white[4] = {1.0, 1.0, 1.0, 1.0};
  53
  54 void
  55 piglit_init(int argc, char **argv)
  56 {
  57         GLfloat realMaxSize;
  58
  59         (void) argc;
  60         (void) argv;
  61
  62 #ifdef PIGLIT_USE_OPENGL
  63         piglit_require_extension("GL_ARB_point_sprite");
  64 #else
  65         piglit_require_extension("GL_OES_point_sprite");
  66 #endif
  67
  68         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  69
  70         glEnable(GL_TEXTURE_2D);
  71         glEnable(GL_POINT_SPRITE);
  72
  73         glGetFloatv(GL_POINT_SIZE_MAX, &realMaxSize);
  74         maxSize = (realMaxSize > BOX_SIZE) ? BOX_SIZE : realMaxSize;
  75
  76         glClearColor(0.2, 0.2, 0.2, 1.0);
  77         glColor4f(1.0, 1.0, 1.0, 1.0);
  78
  79         tex = piglit_checkerboard_texture(0, 0, 2, 2, 1, 1, black, white);
  80         glTexEnvi(GL_POINT_SPRITE, GL_COORD_REPLACE, GL_TRUE);
  81
  82         if (!piglit_automatic)
  83                 printf("Maximum point size is %f, using %f\n",
  84                        realMaxSize, maxSize);
  85 }
  86
  87 enum piglit_result
  88 piglit_display(void)
  89 {
  90 #ifdef PIGLIT_USE_OPENGL
  91         const unsigned num_rows = (piglit_get_gl_version() >= 20) ? 2 : 1;
  92 #else
  93         const unsigned num_rows = 1;
  94 #endif
  95         static const GLenum origins[2] = { GL_UPPER_LEFT, GL_LOWER_LEFT };
  96         GLboolean pass = GL_TRUE;
  97         unsigned i;
  98         unsigned j;
  99
 100         glClear(GL_COLOR_BUFFER_BIT);
 101         glBindTexture(GL_TEXTURE_2D, tex);
 102
 103         for (i = 0; i < num_rows; i++) {
 104                 const float y = 1 + (BOX_SIZE / 2) + (i * (BOX_SIZE + 1));
 105                 const float *const upper_left = (origins[i] == GL_UPPER_LEFT)
 106                         ? black : white;
 107                 const float *const lower_left = (origins[i] == GL_UPPER_LEFT)
 108                         ? white : black;
 109
 110 #ifdef PIGLIT_USE_OPENGL
 111                 /* OpenGL version must be at least 2.0 to support modifying
 112                  * GL_POINT_SPRITE_COORD_ORIGIN.
 113                  */
 114                 if (piglit_get_gl_version() >= 20)
 115                         glPointParameteri(GL_POINT_SPRITE_COORD_ORIGIN,
 116                                           origins[i]);
 117 #endif
 118
 119                 for (j = 0; j < TEST_COLS; j++) {
 120                         const float x = 1 + (BOX_SIZE / 2)
 121                                 + (j * (BOX_SIZE + 1));
 122                         const float size = maxSize / (float) (1 << j);
 123
 124                         /* If the point size is too small, there won't be
 125                          * enough pixels drawn for the tests (below).
 126                          */
 127                         if (size < 2.0)
 128                                 continue;
 129
 130                         glPointSize(size - 0.2);
 131
 132                         /* Vertex arrays are overkill for this case,
 133                          * but they are necessary for OpenGL ES 1.x.
 134                          */
 135                         GLfloat tcp[] = { 1.5, 1.5 };
 136                         GLfloat vp[] = { x, y };
 137
 138                         glEnableClientState(GL_VERTEX_ARRAY);
 139                         glEnableClientState(GL_TEXTURE_COORD_ARRAY);
 140
 141                         glTexCoordPointer(2, GL_FLOAT, 0, tcp);
 142                         glVertexPointer(2, GL_FLOAT, 0, vp);
 143                         glDrawArrays(GL_POINTS, 0, 1);
 144
 145                         glDisableClientState(GL_VERTEX_ARRAY);
 146                         glDisableClientState(GL_TEXTURE_COORD_ARRAY);
 147
 148                         if (!piglit_probe_pixel_rgb(x - (size / 4),
 149                                                     y + (size / 4),
 150                                                     upper_left)
 151                             || !piglit_probe_pixel_rgb(x - (size / 4),
 152                                                        y - (size / 4),
 153                                                        lower_left)
 154                             || !piglit_probe_pixel_rgb(x + (size / 4),
 155                                                        y + (size / 4),
 156                                                        lower_left)
 157                             || !piglit_probe_pixel_rgb(x + (size / 4),
 158                                                        y - (size / 4),
 159                                                        upper_left)) {
 160                                 if (!piglit_automatic)
 161                                         printf("  size = %.3f, "
 162                                                "origin = %s left\n",
 163                                                size,
 164                                                (origins[i] == GL_UPPER_LEFT)
 165                                                ? "upper" : "lower");
 166                                 pass = GL_FALSE;
 167                         }
 168                 }
 169         }
 170
 171         piglit_present_results();
 172
 173         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 174 }