tests/general/depthrange-clear.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 depthrange-clear.c
  29  *
  30  * Tests that clears are appropriately unaffected by glDepthRange().
  31  * Caught a regression in the intel driver with the metaops clear code.
  32  */
  33
  34 #include "piglit-util.h"
  35
  36 int piglit_width = 100, piglit_height = 100;
  37 int piglit_window_mode = GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH;
  38
  39 /**
  40  * Convenience function to draw an axis-aligned rectangle.
  41  */
  42 static void
  43 draw_rect(float x, float y, float w, float h, float d)
  44 {
  45         float verts[4][4];
  46
  47         verts[0][0] = x;
  48         verts[0][1] = y;
  49         verts[0][2] = d;
  50         verts[0][3] = 1.0;
  51         verts[1][0] = x + w;
  52         verts[1][1] = y;
  53         verts[1][2] = d;
  54         verts[1][3] = 1.0;
  55         verts[2][0] = x + w;
  56         verts[2][1] = y + h;
  57         verts[2][2] = d;
  58         verts[2][3] = 1.0;
  59         verts[3][0] = x;
  60         verts[3][1] = y + h;
  61         verts[3][2] = d;
  62         verts[3][3] = 1.0;
  63
  64         glVertexPointer(4, GL_FLOAT, 0, verts);
  65         glEnableClientState(GL_VERTEX_ARRAY);
  66
  67         glDrawArrays(GL_QUADS, 0, 4);
  68
  69         glDisableClientState(GL_VERTEX_ARRAY);
  70 }
  71
  72 static void
  73 draw_rect_set(int y)
  74 {
  75         draw_rect(10, y, 10, 10, -.75);
  76         draw_rect(30, y, 10, 10, -.25);
  77         draw_rect(50, y, 10, 10,  .25);
  78         draw_rect(70, y, 10, 10,  .75);
  79 }
  80
  81 enum piglit_result
  82 piglit_display(void)
  83 {
  84         GLboolean pass = GL_TRUE;
  85         int x, y;
  86         static float red[]   = {1.0, 0.0, 0.0, 0.0};
  87         static float green[] = {0.0, 1.0, 0.0, 0.0};
  88
  89         glEnable(GL_DEPTH_TEST);
  90
  91         glClearColor(0.0, 1.0, 0.0, 0.0);
  92         glClear(GL_COLOR_BUFFER_BIT);
  93
  94         glColor4fv(red);
  95
  96         glClearDepth(0.5);
  97         glClear(GL_DEPTH_BUFFER_BIT);
  98         draw_rect_set(10);
  99
 100         glDepthRange(0.5, 1.0);
 101         glClearDepth(0.5);
 102         glClear(GL_DEPTH_BUFFER_BIT);
 103         glDepthRange(0.0, 1.0);
 104         draw_rect_set(30);
 105
 106         glDepthRange(0.0, 0.5);
 107         glClearDepth(0.5);
 108         glClear(GL_DEPTH_BUFFER_BIT);
 109         glDepthRange(0.0, 1.0);
 110         draw_rect_set(50);
 111
 112         for (y = 0; y < 3; y++) {
 113                 for (x = 0; x < 4; x++) {
 114                         float *expected;
 115
 116                         if (x < 2)
 117                                 expected = green;
 118                         else
 119                                 expected = red;
 120
 121                         pass &= piglit_probe_pixel_rgb(15 + x * 20, 15 + y * 20,
 122                                                        expected);
 123                 }
 124         }
 125
 126         glutSwapBuffers();
 127
 128         return pass ? PIGLIT_SUCCESS : PIGLIT_FAILURE;
 129 }
 130
 131
 132 static void reshape(int width, int height)
 133 {
 134         piglit_width = width;
 135         piglit_height = height;
 136
 137         glViewport(0, 0, width, height);
 138         piglit_ortho_projection(width, height, GL_FALSE);
 139 }
 140
 141 void
 142 piglit_init(int argc, char **argv)
 143 {
 144         reshape(piglit_width, piglit_height);
 145 }