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.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 int piglit_width = 50, piglit_height = 50;
  42 int piglit_window_mode = GLUT_RGBA | GLUT_ALPHA | GLUT_DOUBLE;
  43
  44 static PFNGLFOGCOORDFPROC pglFogCoordf = NULL;
  45
  46 enum piglit_result
  47 piglit_display(void)
  48 {
  49         static const struct {
  50                 float x, y, r;
  51         }
  52         probes[4] = {
  53                 { 0.5, 1.5, 0.3 },
  54                 { 1.5, 1.5, 0.6 },
  55                 { 0.5, 0.5, 0.8 },
  56                 { 1.5, 0.5, 0.4 },
  57         };
  58         int pass = 1;
  59         unsigned i;
  60
  61         glClear(GL_COLOR_BUFFER_BIT);
  62
  63         pglFogCoordf(0.3);
  64         glBegin(GL_QUADS);
  65         glVertex2f(0, 1);
  66         glVertex2f(1, 1);
  67         glVertex2f(1, 2);
  68         glVertex2f(0, 2);
  69         glEnd();
  70
  71         pglFogCoordf(0.6);
  72         glBegin(GL_QUADS);
  73         glVertex2f(1, 1);
  74         glVertex2f(2, 1);
  75         glVertex2f(2, 2);
  76         glVertex2f(1, 2);
  77         glEnd();
  78
  79         pglFogCoordf(0.8);
  80         glBegin(GL_QUADS);
  81         glVertex2f(0, 0);
  82         glVertex2f(1, 0);
  83         glVertex2f(1, 1);
  84         glVertex2f(0, 1);
  85         glEnd();
  86
  87         pglFogCoordf(0.4);
  88         glBegin(GL_QUADS);
  89         glVertex2f(1, 0);
  90         glVertex2f(2, 0);
  91         glVertex2f(2, 1);
  92         glVertex2f(1, 1);
  93         glEnd();
  94
  95         for (i = 0; i < 4; i++) {
  96                 float expected_color[4];
  97
  98                 expected_color[0] = probes[i].r;
  99                 expected_color[1] = 0.0;
 100                 expected_color[2] = 0.0;
 101                 expected_color[3] = 1.0;
 102
 103                 pass &= piglit_probe_pixel_rgba(probes[i].x * piglit_width / 2,
 104                                                 probes[i].y * piglit_height / 2,
 105                                                 expected_color);
 106         }
 107
 108         glutSwapBuffers();
 109
 110         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 111 }
 112
 113
 114 static void Reshape(int width, int height)
 115 {
 116         piglit_width = width;
 117         piglit_height = height;
 118
 119         glViewport(0, 0, width, height);
 120         glMatrixMode(GL_PROJECTION);
 121         glLoadIdentity();
 122         glOrtho(0.0, 2.0, 0.0, 2.0, -2.0, 6.0);
 123         glScalef(1.0, 1.0, -1.0); // flip z-axis
 124         glMatrixMode(GL_MODELVIEW);
 125         glLoadIdentity();
 126 }
 127
 128 void
 129 piglit_init(int argc, char **argv)
 130 {
 131         glewInit();
 132         printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
 133
 134         glutReshapeFunc(Reshape);
 135
 136         glClearColor(0.3, 0.3, 0.3, 0.3);
 137
 138         if (GLEW_VERSION_1_4) {
 139                 pglFogCoordf = glFogCoordf;
 140         } else if (GLEW_EXT_fog_coord) {
 141                 pglFogCoordf = glFogCoordfEXT;
 142         } else {
 143                 piglit_report_result(PIGLIT_SKIP);
 144         }
 145
 146         piglit_require_fragment_program();
 147         prog = piglit_compile_program(GL_FRAGMENT_PROGRAM_ARB, program_text);
 148
 149         glEnable(GL_FRAGMENT_PROGRAM_ARB);
 150         glBindProgramARB(GL_FRAGMENT_PROGRAM_ARB, prog);
 151
 152         glFogi(GL_FOG_COORDINATE_SOURCE_EXT, GL_FOG_COORDINATE_EXT);
 153
 154         Reshape(piglit_width, piglit_height);
 155 }