tests/general/depthfunc.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 depthfunc.c
  29  *
  30  * Tests that glDepthFunc()'s various modes all work correctly.
  31  */
  32
  33 #include "piglit-util-gl.h"
  34
  35 PIGLIT_GL_TEST_CONFIG_BEGIN
  36
  37         config.supports_gl_compat_version = 10;
  38
  39         config.window_height = 200;
  40         config.window_visual = PIGLIT_GL_VISUAL_RGBA | PIGLIT_GL_VISUAL_DEPTH;
  41         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  42
  43 PIGLIT_GL_TEST_CONFIG_END
  44
  45 /**
  46  * Convenience function to draw an axis-aligned rectangle.
  47  */
  48 static void
  49 draw_rect_depth(float x, float y, float w, float h, float d)
  50 {
  51         float verts[4][4];
  52
  53         verts[0][0] = x;
  54         verts[0][1] = y;
  55         verts[0][2] = d;
  56         verts[0][3] = 1.0;
  57         verts[1][0] = x + w;
  58         verts[1][1] = y;
  59         verts[1][2] = d;
  60         verts[1][3] = 1.0;
  61         verts[2][0] = x + w;
  62         verts[2][1] = y + h;
  63         verts[2][2] = d;
  64         verts[2][3] = 1.0;
  65         verts[3][0] = x;
  66         verts[3][1] = y + h;
  67         verts[3][2] = d;
  68         verts[3][3] = 1.0;
  69
  70         glVertexPointer(4, GL_FLOAT, 0, verts);
  71         glEnableClientState(GL_VERTEX_ARRAY);
  72
  73         glDrawArrays(GL_QUADS, 0, 4);
  74
  75         glDisableClientState(GL_VERTEX_ARRAY);
  76 }
  77
  78 enum piglit_result
  79 piglit_display(void)
  80 {
  81         GLboolean pass = GL_TRUE;
  82         int i;
  83         GLenum funcs[] = {
  84                 GL_NEVER,
  85                 GL_LESS,
  86                 GL_EQUAL,
  87                 GL_LEQUAL,
  88                 GL_GREATER,
  89                 GL_NOTEQUAL,
  90                 GL_GEQUAL,
  91                 GL_ALWAYS,
  92         };
  93         const float green[4] = {0, 1, 0, 0};
  94         const float blue[4] =  {0, 0, 1, 0};
  95
  96         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  97         /* Clear gray. */
  98         glClearColor(0.5, 0.5, 0.5, 0.0);
  99         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
 100
 101         glColor4f(0.0, 1.0, 0.0, 0.0);
 102         glEnable(GL_DEPTH_TEST);
 103         glDepthFunc(GL_ALWAYS);
 104         for (i = 0; i < ARRAY_SIZE(funcs); i++) {
 105                 draw_rect_depth(10, 10 + 20 * i, 10, 10, 0.0);
 106                 draw_rect_depth(30, 10 + 20 * i, 10, 10, 0.0);
 107                 draw_rect_depth(50, 10 + 20 * i, 10, 10, 0.0);
 108         }
 109
 110         glColor4f(0.0, 0.0, 1.0, 0.0);
 111         for (i = 0; i < ARRAY_SIZE(funcs); i++) {
 112                 glDepthFunc(funcs[i]);
 113                 draw_rect_depth(10, 10 + 20 * i, 10, 10, 0.5);
 114                 draw_rect_depth(30, 10 + 20 * i, 10, 10, 0.0);
 115                 draw_rect_depth(50, 10 + 20 * i, 10, 10, -0.5);
 116         }
 117
 118         for (i = 0; i < ARRAY_SIZE(funcs); i++) {
 119                 glDepthFunc(funcs[i]);
 120                 pass = pass && piglit_probe_pixel_rgb(15, 15 + 20 * i,
 121                                                       i & 1 ? blue : green);
 122                 pass = pass && piglit_probe_pixel_rgb(35, 15 + 20 * i,
 123                                                       i & 2 ? blue : green);
 124                 pass = pass && piglit_probe_pixel_rgb(55, 15 + 20 * i,
 125                                                       i & 4 ? blue : green);
 126         }
 127
 128         piglit_present_results();
 129
 130         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 131 }
 132
 133 void piglit_init(int argc, char**argv)
 134 {
 135 }