tests/spec/ati_fragment_shader/render-fog.c

   1 /*
   2  * Copyright © 2017 Miklós Máté
   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
  24 /**
  25  * Tests rendering with GL_ATI_fragment_shader: using fog.
  26  */
  27
  28 #include "piglit-util-gl.h"
  29
  30 PIGLIT_GL_TEST_CONFIG_BEGIN
  31
  32         config.supports_gl_compat_version = 10;
  33         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  34
  35 PIGLIT_GL_TEST_CONFIG_END
  36
  37 static const float color1[] = {0.2, 0.3, 0.8, 0.8};
  38 static const float color2[] = {0.9, 0.8, 0.3, 0.3};
  39
  40 static float resultLin[] = {0.0, 0.0, 0.0, 0.0};
  41 static float resultExp[] = {0.0, 0.0, 0.0, 0.0};
  42 static float resultEx2[] = {0.0, 0.0, 0.0, 0.0};
  43
  44 static const float z = 0.8;
  45 static const float dens = 0.4;
  46
  47 enum piglit_result
  48 piglit_display(void)
  49 {
  50         bool pass = true;
  51
  52         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  53
  54         glClearColor(1.0, 0.0, 0.0, 1.0);
  55         glClear(GL_COLOR_BUFFER_BIT);
  56
  57         glColor4fv(color2);
  58
  59         glFogfv(GL_FOG_COLOR, color1);
  60         glFogf(GL_FOG_DENSITY, dens);
  61         glFogf(GL_FOG_START, 0.0);
  62         glFogf(GL_FOG_END, 1.0);
  63         glHint(GL_FOG_HINT, GL_NICEST);
  64
  65         glEnable(GL_FRAGMENT_SHADER_ATI);
  66         glEnable(GL_FOG);
  67         glFogi(GL_FOG_MODE, GL_LINEAR);
  68         piglit_draw_rect_z(z, 0, 0,
  69                            piglit_width / 4, piglit_height);
  70         glFogi(GL_FOG_MODE, GL_EXP);
  71         piglit_draw_rect_z(z, piglit_width / 4, 0,
  72                            piglit_width / 4, piglit_height);
  73         glFogi(GL_FOG_MODE, GL_EXP2);
  74         piglit_draw_rect_z(z, 2 * piglit_width / 4, 0,
  75                            piglit_width / 4, piglit_height);
  76         glDisable(GL_FOG);
  77         piglit_draw_rect_z(z, 3 * piglit_width / 4, 0,
  78                            piglit_width / 4, piglit_height);
  79         glDisable(GL_FRAGMENT_SHADER_ATI);
  80
  81         pass = pass && piglit_probe_rect_rgba(0, 0,
  82                                               piglit_width / 4,
  83                                               piglit_height, resultLin);
  84         pass = pass && piglit_probe_rect_rgba(piglit_width / 4, 0,
  85                                               piglit_width / 4,
  86                                               piglit_height, resultExp);
  87         pass = pass && piglit_probe_rect_rgba(2 * piglit_width / 4, 0,
  88                                               piglit_width / 4,
  89                                               piglit_height, resultEx2);
  90         pass = pass && piglit_probe_rect_rgba(3 * piglit_width / 4, 0,
  91                                               piglit_width / 4,
  92                                               piglit_height, color2);
  93
  94         piglit_present_results();
  95
  96         pass &= piglit_check_gl_error(GL_NO_ERROR);
  97
  98         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  99 }
 100
 101 void
 102 piglit_init(int argc, char **argv)
 103 {
 104         unsigned u;
 105         float f;
 106
 107         piglit_require_extension("GL_ATI_fragment_shader");
 108
 109         glBeginFragmentShaderATI();
 110         glColorFragmentOp1ATI(GL_MOV_ATI, GL_REG_0_ATI, GL_NONE, GL_NONE,
 111                         GL_PRIMARY_COLOR_ARB, GL_NONE, GL_NONE);
 112         glAlphaFragmentOp1ATI(GL_MOV_ATI, GL_REG_0_ATI, GL_NONE,
 113                         GL_PRIMARY_COLOR_ARB, GL_NONE, GL_NONE);
 114         glEndFragmentShaderATI();
 115
 116         /* compute the expected results */
 117
 118         for (u=0; u<3; u++) {
 119                 f = (1.0-z)/(1.0-0.0);
 120                 resultLin[u] = f*color2[u] + (1.0-f)*color1[u];
 121                 f = exp(-dens*z);
 122                 resultExp[u] = f*color2[u] + (1.0-f)*color1[u];
 123                 f = exp(-pow(dens*z,2.0));
 124                 resultEx2[u] = f*color2[u] + (1.0-f)*color1[u];
 125         }
 126         resultLin[3] = color2[3];
 127         resultExp[3] = color2[3];
 128         resultEx2[3] = color2[3];
 129
 130         if (!piglit_check_gl_error(GL_NO_ERROR))
 131                 piglit_report_result(PIGLIT_FAIL);
 132 }