tests/shaders/fp-fog.c

   1 /*
   2  * Copyright © 2008 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  * \file
  26  * Test passing fog coordinates into a fragment program.
  27  *
  28  * \author Ian Romanick <ian.d.romanick@intel.com>
  29  */
  30
  31 #include "piglit-util-gl.h"
  32
  33 static GLint prog = 0;
  34
  35 static const char* const program_text =
  36         "!!ARBfp1.0\n"
  37         "MOV result.color, fragment.fogcoord;\n"
  38         "END\n"
  39         ;
  40
  41 PIGLIT_GL_TEST_CONFIG_BEGIN
  42
  43         config.supports_gl_compat_version = 10;
  44
  45         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DOUBLE;
  46
  47 PIGLIT_GL_TEST_CONFIG_END
  48
  49 static PFNGLFOGCOORDFPROC pglFogCoordf = NULL;
  50
  51 enum piglit_result
  52 piglit_display(void)
  53 {
  54         static const struct {
  55                 float x, y, r;
  56         }
  57         probes[4] = {
  58                 { 0.5, 1.5, 0.3 },
  59                 { 1.5, 1.5, 0.6 },
  60                 { 0.5, 0.5, 0.8 },
  61                 { 1.5, 0.5, 0.4 },
  62         };
  63         int pass = 1;
  64         unsigned i;
  65
  66         piglit_ortho_projection(2.0, 2.0, GL_FALSE);
  67
  68         glClear(GL_COLOR_BUFFER_BIT);
  69
  70         pglFogCoordf(0.3);
  71         glBegin(GL_QUADS);
  72         glVertex2f(0, 1);
  73         glVertex2f(1, 1);
  74         glVertex2f(1, 2);
  75         glVertex2f(0, 2);
  76         glEnd();
  77
  78         pglFogCoordf(0.6);
  79         glBegin(GL_QUADS);
  80         glVertex2f(1, 1);
  81         glVertex2f(2, 1);
  82         glVertex2f(2, 2);
  83         glVertex2f(1, 2);
  84         glEnd();
  85
  86         pglFogCoordf(0.8);
  87         glBegin(GL_QUADS);
  88         glVertex2f(0, 0);
  89         glVertex2f(1, 0);
  90         glVertex2f(1, 1);
  91         glVertex2f(0, 1);
  92         glEnd();
  93
  94         pglFogCoordf(0.4);
  95         glBegin(GL_QUADS);
  96         glVertex2f(1, 0);
  97         glVertex2f(2, 0);
  98         glVertex2f(2, 1);
  99         glVertex2f(1, 1);
 100         glEnd();
 101
 102         for (i = 0; i < 4; i++) {
 103                 float expected_color[4];
 104
 105                 expected_color[0] = probes[i].r;
 106                 expected_color[1] = 0.0;
 107                 expected_color[2] = 0.0;
 108                 expected_color[3] = 1.0;
 109
 110                 pass &= piglit_probe_pixel_rgba(probes[i].x * piglit_width / 2,
 111                                                 probes[i].y * piglit_height / 2,
 112                                                 expected_color);
 113         }
 114
 115         piglit_present_results();
 116
 117         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 118 }
 119
 120 void
 121 piglit_init(int argc, char **argv)
 122 {
 123         printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 124
 125         glClearColor(0.3, 0.3, 0.3, 0.3);
 126
 127         if (piglit_get_gl_version() >= 14) {
 128                 pglFogCoordf = glFogCoordf;
 129         } else if (piglit_is_extension_supported("GL_EXT_fog_coord")) {
 130                 pglFogCoordf = glFogCoordfEXT;
 131         } else {
 132                 piglit_report_result(PIGLIT_SKIP);
 133         }
 134
 135         piglit_require_fragment_program();
 136         prog = piglit_compile_program(GL_FRAGMENT_PROGRAM_ARB, program_text);
 137
 138         glEnable(GL_FRAGMENT_PROGRAM_ARB);
 139         glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prog);
 140
 141         glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
 142 }