tests/general/depth_clamp.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
  21  * DEALINGS IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  */
  26
  27 /** @file depth_clamp.c
  28  * Tests ARB_depth_clamp functionality by drawing side-by-side triangles,
  29  * lines, points, and raster images that go behind the near plane, and
  30  * testing that when DEPTH_CLAMP is enabled they get rasterized as they should.
  31  *
  32  * An extension of this test would be to test that the depth values are
  33  * correctly clamped to the near/far plane, not just unclipped, and to test
  34  * the same operations against the far plane.
  35  */
  36
  37 #include "piglit-util.h"
  38
  39 int piglit_width = 100, piglit_height = 150;
  40 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH;
  41
  42 /* In case the headers have the old enum name but not the new */
  43 #ifndef GL_DEPTH_CLAMP
  44 #define GL_DEPTH_CLAMP GL_DEPTH_CLAMP_NV
  45 #endif
  46
  47 void
  48 piglit_init(int argc, char **argv)
  49 {
  50         piglit_require_extension("GL_ARB_depth_clamp");
  51
  52         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
  53 }
  54
  55 enum piglit_result
  56 piglit_display(void)
  57 {
  58         GLboolean pass = GL_TRUE;
  59         float white[3] = {1.0, 1.0, 1.0};
  60         float clear[3] = {0.0, 0.0, 0.0};
  61         float white_rect[20 * 20 * 3];
  62         int i;
  63
  64         for (i = 0; i < ARRAY_SIZE(white_rect); i++)
  65                 white_rect[i] = 1.0;
  66
  67         glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  68
  69         /* 1: unclamped quad */
  70         glDisable(GL_DEPTH_CLAMP);
  71         glColor4fv(white);
  72         glBegin(GL_QUADS);
  73         glVertex3f(10, 10, 0);
  74         glVertex3f(30, 10, 0);
  75         glVertex3f(30, 30, -2);
  76         glVertex3f(10, 30, -2);
  77         glEnd();
  78
  79         /* 2: clamped quad */
  80         glEnable(GL_DEPTH_CLAMP);
  81         glBegin(GL_QUADS);
  82         glVertex3f(40, 10, 0);
  83         glVertex3f(60, 10, 0);
  84         glVertex3f(60, 30, -2);
  85         glVertex3f(40, 30, -2);
  86         glEnd();
  87
  88         /* 3: unclamped line */
  89         glDisable(GL_DEPTH_CLAMP);
  90         glBegin(GL_LINES);
  91         glVertex3f(10.5, 40.5, 0);
  92         glVertex3f(10.5, 60.5, -2);
  93         glEnd();
  94
  95         /* 4: clamped line */
  96         glEnable(GL_DEPTH_CLAMP);
  97         glBegin(GL_LINES);
  98         glVertex3f(40.5, 40.5, 0);
  99         glVertex3f(40.5, 60.5, -2);
 100         glEnd();
 101
 102         /* 5: unclamped point */
 103         glDisable(GL_DEPTH_CLAMP);
 104         glBegin(GL_POINTS);
 105         glVertex3f(10.5, 70.5, -2);
 106         glEnd();
 107
 108         /* 6: clamped point */
 109         glEnable(GL_DEPTH_CLAMP);
 110         glBegin(GL_POINTS);
 111         glVertex3f(40.5, 70.5, -2);
 112         glEnd();
 113
 114         /* 7: unclamped raster */
 115         glDisable(GL_DEPTH_CLAMP);
 116         glRasterPos3f(10, 80, -2);
 117         glDrawPixels(20, 20, GL_RGB, GL_FLOAT, white_rect);
 118
 119         /* 8: clamped raster */
 120         glEnable(GL_DEPTH_CLAMP);
 121         glRasterPos3f(40, 80, -2);
 122         glDrawPixels(20, 20, GL_RGB, GL_FLOAT, white_rect);
 123
 124         /* 1: unclamped quad */
 125         pass = piglit_probe_pixel_rgb(20, 15, white) && pass;
 126         pass = piglit_probe_pixel_rgb(20, 25, clear) && pass;
 127
 128         /* 2: clamped quad */
 129         pass = piglit_probe_pixel_rgb(50, 15, white) && pass;
 130         pass = piglit_probe_pixel_rgb(50, 25, white) && pass;
 131
 132         /* 3: unclamped line */
 133         pass = piglit_probe_pixel_rgb(10, 45, white) && pass;
 134         pass = piglit_probe_pixel_rgb(10, 55, clear) && pass;
 135
 136         /* 4: unclamped line */
 137         pass = piglit_probe_pixel_rgb(40, 45, white) && pass;
 138         pass = piglit_probe_pixel_rgb(40, 55, white) && pass;
 139
 140         /* 5: unclamped point */
 141         pass = piglit_probe_pixel_rgb(10, 70, clear) && pass;
 142
 143         /* 6: clamped point */
 144         pass = piglit_probe_pixel_rgb(40, 70, white) && pass;
 145
 146         /* 7: unclamped raster */
 147         pass = piglit_probe_pixel_rgb(20, 90, clear) && pass;
 148
 149         /* 8: clamped raster */
 150         pass = piglit_probe_pixel_rgb(50, 90, white) && pass;
 151
 152         glutSwapBuffers();
 153
 154         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 155 }