tests/general/depth-clear-with-copy.c

   1 /*
   2  * Copyright © 2023 Zeb Figura
   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
  24 /** @file depth-copy.c
  25  *
  26  * A regression test for a broken code path in radeonsi related to
  27  * fast depth clears.
  28  */
  29
  30 #include "piglit-util-gl.h"
  31 #include <stdlib.h>
  32
  33 PIGLIT_GL_TEST_CONFIG_BEGIN
  34
  35         config.supports_gl_compat_version = 11;
  36         config.window_visual = PIGLIT_GL_VISUAL_RGB | PIGLIT_GL_VISUAL_DOUBLE |
  37                                PIGLIT_GL_VISUAL_DEPTH;
  38
  39 PIGLIT_GL_TEST_CONFIG_END
  40
  41 void piglit_init(int argc, char **argv)
  42 {
  43         piglit_require_extension("GL_ARB_copy_image");
  44         piglit_require_extension("GL_ARB_framebuffer_object");
  45         glDepthFunc(GL_ALWAYS);
  46         glEnable(GL_DEPTH_TEST);
  47         glDepthMask(GL_TRUE);
  48 }
  49
  50 enum piglit_result piglit_display(void)
  51 {
  52         GLuint fb, depth[2];
  53         bool pass = true;
  54         GLfloat *pixels;
  55         unsigned int i;
  56
  57         glGenTextures(2, depth);
  58         glBindTexture(GL_TEXTURE_2D, depth[0]);
  59         glTexStorage2D(GL_TEXTURE_2D, 1, GL_DEPTH_COMPONENT24, piglit_width, piglit_height);
  60         glBindTexture(GL_TEXTURE_2D, depth[1]);
  61         glTexStorage2D(GL_TEXTURE_2D, 1, GL_DEPTH_COMPONENT24, piglit_width, piglit_height);
  62
  63         /* Clear the first texture to 0. */
  64         glGenFramebuffers(1, &fb);
  65         glBindFramebuffer(GL_FRAMEBUFFER, fb);
  66         glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth[0], 0);
  67         assert(glCheckFramebufferStatus(GL_FRAMEBUFFER) == GL_FRAMEBUFFER_COMPLETE);
  68         glClearDepth(0.0);
  69         glClear(GL_DEPTH_BUFFER_BIT);
  70
  71         /* Copy to the second texture. */
  72         glCopyImageSubData(depth[0], GL_TEXTURE_2D, 0, 0, 0, 0, depth[1], GL_TEXTURE_2D, 0, 0, 0, 0, piglit_width, piglit_height, 1);
  73
  74         /* Clear the first texture to 1. */
  75         glClearDepth(1.0);
  76         glClear(GL_DEPTH_BUFFER_BIT);
  77
  78         /* Draw to the first texture. */
  79
  80         glBegin(GL_TRIANGLE_STRIP);
  81         glVertex3f(-0.6f, -0.7f, 0.5f);
  82         glVertex3f( 0.8f,  0.5f, 0.5f);
  83         glVertex3f( 0.7f, -0.7f, 0.5f);
  84         glEnd();
  85
  86         pixels = malloc(piglit_width * piglit_height * sizeof(*pixels));
  87         glReadPixels(0, 0, piglit_width, piglit_height, GL_DEPTH_COMPONENT, GL_FLOAT, pixels);
  88         for (i = 0; i < piglit_width * piglit_height; ++i) {
  89                 GLfloat probe = pixels[i];
  90                 /* Every pixel should either be 0.75f (tri depth) or 1.0f (clear depth). */
  91                 if (fabsf(probe - 0.75f) >= 0.01 && fabsf(probe - 1.0f) >= 0.01) {
  92                         printf("Got depth %.8e at (%u, %u).\n", probe, i % piglit_width, i / piglit_width);
  93                         pass = false;
  94                         break;
  95                 }
  96         }
  97         free(pixels);
  98
  99         piglit_present_results();
 100
 101         glDeleteFramebuffers(1, &fb);
 102         glDeleteTextures(2, depth);
 103
 104         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 105 }