tests/general/degenerate-prims.c

   1 /*
   2  * Copyright © 2013 VMware, Inc.
   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
  26 /**
  27  * Test drawing primitives with too few vertices.  In particular,
  28  * GL_QUADS and GL_QUAD_STRIP with 3 verts seems to regress every
  29  * once in a while in Mesa.
  30  *
  31  * Brian Paul
  32  * Feb 2013
  33  */
  34
  35
  36 #include "piglit-util-gl.h"
  37
  38 PIGLIT_GL_TEST_CONFIG_BEGIN
  39         config.supports_gl_compat_version = 10;
  40         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  41         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  42 PIGLIT_GL_TEST_CONFIG_END
  43
  44 struct test_data {
  45         GLenum prim;
  46         unsigned numVerts;
  47         const void *verts;
  48 };
  49
  50 /**
  51  * Test a specific degenerate primitive.
  52  * The expected outcome is that nothing will be drawn.
  53  */
  54 static enum piglit_result
  55 test_prim(void *_data)
  56 {
  57         struct test_data *data = _data;
  58         static const float black[] = {0, 0, 0, 0};
  59         bool pass;
  60
  61         glClear(GL_COLOR_BUFFER_BIT);
  62
  63         glVertexPointer(2, GL_FLOAT, 0, data->verts);
  64         glEnable(GL_VERTEX_ARRAY);
  65         glDrawArrays(data->prim, 0, data->numVerts);
  66
  67         /* Nothing should have been drawn / look for all black */
  68         pass = piglit_probe_rect_rgb(0, 0, piglit_width, piglit_height, black);
  69
  70         piglit_present_results();
  71
  72         piglit_report_subtest_result(pass ? PIGLIT_PASS : PIGLIT_FAIL,
  73                                      "Primitive: %s", piglit_get_prim_name(data->prim));
  74
  75         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  76 }
  77
  78
  79 enum piglit_result
  80 piglit_display(void)
  81 {
  82         static const float
  83                 verts2[2][2] = { {-1, -1}, {1, 1} },
  84                 verts3[3][2] = { {-1, -1}, {1, -1}, {0, 1} },
  85                 verts4[4][2] = { {-1, -1}, {1, -1}, {1, 1}, {-1, 1} };
  86         enum piglit_result result = PIGLIT_PASS;
  87
  88         glMatrixMode(GL_PROJECTION);
  89         glLoadIdentity();
  90         glOrtho(-1, 1, -1, 1, -1, 1);
  91
  92         glColor3f(1, 1, 1);
  93
  94         struct test_data data[] = {
  95                 { GL_POINTS, 0, verts2 },
  96                 { GL_LINES, 1, verts2 },
  97                 { GL_LINE_STRIP, 1, verts2 },
  98                 { GL_LINE_LOOP, 1, verts2 },
  99                 { GL_TRIANGLES, 2, verts3 },
 100                 { GL_TRIANGLE_STRIP, 2, verts3 },
 101                 { GL_TRIANGLE_FAN, 2, verts3 },
 102                 { GL_QUADS, 3, verts4 },
 103                 { GL_QUAD_STRIP, 3, verts4 },
 104                 { GL_POLYGON, 2, verts4 },
 105         };
 106
 107         struct piglit_subtest tests[ARRAY_SIZE(data) + 1];
 108         for (int i = 0; i < ARRAY_SIZE(data); ++i) {
 109                 tests[i].name = piglit_get_prim_name(data[i].prim);
 110                 tests[i].option = "";
 111                 tests[i].subtest_func = test_prim;
 112                 tests[i].data = &data[i];
 113         }
 114         tests[ARRAY_SIZE(data)].name = NULL;
 115
 116         result  = piglit_run_selected_subtests(tests, NULL, 0, result);
 117
 118         return result;
 119 }
 120
 121
 122 void
 123 piglit_init(int argc, char **argv)
 124 {
 125         /* nop */
 126 }