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