tests/shaders/glsl-fs-pointcoord.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 DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *
  26  */
  27
  28 /** @file glsl-fs-pointcoord.c
  29  *
  30  * Tests that gl_PointCoord produces the expected output in a fragment shader
  31  * with point sprites enabled.
  32  */
  33
  34 #include <assert.h>
  35 #include <string.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <errno.h>
  39 #include <sys/stat.h>
  40
  41 #include "piglit-util-gl.h"
  42
  43 PIGLIT_GL_TEST_CONFIG_BEGIN
  44
  45         config.supports_gl_compat_version = 10;
  46
  47         config.window_width = 256;
  48         config.window_height = 256;
  49         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGB;
  50
  51 PIGLIT_GL_TEST_CONFIG_END
  52
  53 static GLint prog;
  54 static GLint point_size;
  55
  56 enum piglit_result
  57 piglit_display(void)
  58 {
  59         GLboolean pass = GL_TRUE;
  60         const float red[4] =    {1, 0, 0, 0};
  61         const float green[4] =  {0, 1, 0, 0};
  62         const float yellow[4] = {1, 1, 0, 0};
  63         const float black[4] =  {0, 0, 0, 0};
  64
  65         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  66
  67         glClearColor(0.5, 0.5, 0.5, 0.5);
  68         glClear(GL_COLOR_BUFFER_BIT);
  69
  70         glPointSize(point_size);
  71         glBegin(GL_POINTS);
  72         glVertex2f(point_size / 2.0, point_size / 2.0);
  73         glEnd();
  74
  75         pass = pass && piglit_probe_pixel_rgb(0, 0, green);
  76         pass = pass && piglit_probe_pixel_rgb(point_size - 1, 0, yellow);
  77         pass = pass && piglit_probe_pixel_rgb(0, point_size - 1, black);
  78         pass = pass && piglit_probe_pixel_rgb(point_size - 1, point_size - 1, red);
  79
  80         piglit_present_results();
  81
  82         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  83 }
  84
  85 void piglit_init(int argc, char**argv)
  86 {
  87         GLint vs, fs;
  88         GLint point_size_limits[2];
  89
  90         piglit_require_gl_version(20);
  91         piglit_require_extension("GL_ARB_point_sprite");
  92
  93         glGetIntegerv(GL_ALIASED_POINT_SIZE_RANGE, point_size_limits);
  94         point_size = point_size_limits[1];
  95
  96         if (point_size > piglit_width)
  97                 point_size = piglit_width;
  98         if (point_size > piglit_height)
  99                 point_size = piglit_height;
 100
 101         vs = piglit_compile_shader(GL_VERTEX_SHADER,
 102                                    "shaders/glsl-fs-pointcoord.vert");
 103         fs = piglit_compile_shader(GL_FRAGMENT_SHADER,
 104                                    "shaders/glsl-fs-pointcoord.frag");
 105
 106         prog = piglit_link_simple_program(vs, fs);
 107
 108         glEnable(GL_POINT_SPRITE);
 109
 110         glUseProgram(prog);
 111 }