tests/shaders/glsl-vs-point-size.c

   1 /*
   2  * Copyright © 2010 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  *    Neil Roberts <neil@linux.intel.com>
  25  *
  26  */
  27
  28 /** @file glsl-vs-point-size.c
  29  *
  30  * Tests whether a vertex shader can change the point size by writing
  31  * to gl_PointSize.
  32  *
  33  * Bug #27250
  34  */
  35
  36 #include "piglit-util-gl.h"
  37
  38 PIGLIT_GL_TEST_CONFIG_BEGIN
  39
  40         config.supports_gl_compat_version = 10;
  41
  42         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE;
  43         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  44
  45 PIGLIT_GL_TEST_CONFIG_END
  46
  47 static GLint prog;
  48
  49 static const float white[4] = {1, 1, 1, 1};
  50 static const float black[4] = {0, 0, 0, 0};
  51
  52 #define POINT_SIZE 16
  53
  54 enum piglit_result
  55 piglit_display(void)
  56 {
  57         GLboolean pass = GL_TRUE;
  58         float vert[2] = { piglit_width / 2, piglit_height / 2 };
  59
  60         /* Clear the window to black */
  61         glClear(GL_COLOR_BUFFER_BIT);
  62
  63         /* Draw a single white point at the centre of the window. The
  64            vertex shader should make this larger */
  65         glColor3fv(white);
  66         glVertexPointer(2, GL_FLOAT, 0, vert);
  67         glEnableClientState(GL_VERTEX_ARRAY);
  68         glDrawArrays(GL_POINTS, 0, 1);
  69         glDisableClientState(GL_VERTEX_ARRAY);
  70
  71         /* Verify that the point is large by looking at some corner pixels */
  72         pass &= piglit_probe_pixel_rgb(piglit_width / 2 - POINT_SIZE / 2 + 1,
  73                                        piglit_height / 2 - POINT_SIZE / 2 + 1,
  74                                        white);
  75         pass &= piglit_probe_pixel_rgb(piglit_width / 2 + POINT_SIZE / 2 - 1,
  76                                        piglit_height / 2 + POINT_SIZE / 2 - 1,
  77                                        white);
  78         /* Sanity check that the corners of the window aren't filled */
  79         pass &= piglit_probe_pixel_rgb(0, 0, black);
  80         pass &= piglit_probe_pixel_rgb(piglit_width - 1, piglit_height - 1,
  81                                        black);
  82
  83         piglit_present_results();
  84
  85         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  86 }
  87
  88 void
  89 piglit_init(int argc, char **argv)
  90 {
  91         GLint vs;
  92         GLint point_size_range[2];
  93
  94         piglit_require_gl_version(20);
  95         /* If the driver doesn't claim to support the point size the
  96            shader is going to set then we should skip the test */
  97         glGetIntegerv(GL_ALIASED_POINT_SIZE_RANGE, point_size_range);
  98         if (POINT_SIZE < point_size_range[0] ||
  99             POINT_SIZE > point_size_range[1]) {
 100                 printf("Point size %i not supported\n", POINT_SIZE);
 101                 piglit_report_result(PIGLIT_SKIP);
 102         }
 103
 104         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 105         glClearColor(0.0, 0.0, 0.0, 1.0);
 106
 107         vs = piglit_compile_shader(GL_VERTEX_SHADER,
 108                                    "shaders/glsl-vs-point-size.vert");
 109
 110         prog = piglit_link_simple_program(vs, 0);
 111
 112         glUseProgram(prog);
 113
 114         glEnable(GL_VERTEX_PROGRAM_POINT_SIZE);
 115 }