tests/spec/arb_sampler_objects/framebufferblit.c

   1 /*
   2  * Copyright © 2012 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
  24 /**
  25  * @file framebufferblit.c
  26  *
  27  * Tests interaction between GL_ARB_sampler_objects and
  28  * GL_EXT_framebuffer_blit.  There was a bug in mesa in which the
  29  * fbblit would accidentally apply an active sampler object from a
  30  * texture.
  31  *
  32  * To test this, ask for a nearest blit stretching from single pixel
  33  * to the window, and check if the LINEAR on the sampler object makes
  34  * the neighbors of that pixel get filtered in.
  35  */
  36
  37 #include "piglit-util-gl.h"
  38
  39 PIGLIT_GL_TEST_CONFIG_BEGIN
  40
  41         config.supports_gl_compat_version = 10;
  42
  43         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  44
  45 PIGLIT_GL_TEST_CONFIG_END
  46
  47 enum piglit_result
  48 piglit_display(void)
  49 {
  50         bool pass = true;
  51         GLuint tex, sampler, fb;
  52         const float tex_data[16] = {0, 1, 0, 0,
  53                                     1, 0, 0, 0,
  54                                     1, 0, 0, 0,
  55                                     1, 0, 0, 0};
  56         const float *green = tex_data;
  57
  58         glClearColor(0, 0, 1, 0);
  59         glClear(GL_COLOR_BUFFER_BIT);
  60
  61         glGenTextures(1, &tex);
  62         glBindTexture(GL_TEXTURE_2D, tex);
  63         glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, 2, 2, 0,
  64                      GL_RGBA, GL_FLOAT, tex_data);
  65
  66         glGenFramebuffers(1, &fb);
  67         glBindFramebuffer(GL_FRAMEBUFFER, fb);
  68
  69         glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT,
  70                                   GL_COLOR_ATTACHMENT0_EXT,
  71                                   GL_TEXTURE_2D,
  72                                   tex,
  73                                   0);
  74         if (!piglit_check_gl_error(GL_NO_ERROR))
  75                 piglit_report_result(PIGLIT_FAIL);
  76
  77         glGenSamplers(1, &sampler);
  78         glSamplerParameteri(sampler, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
  79         glSamplerParameteri(sampler, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
  80         glBindSampler(0, sampler);
  81
  82         glBindFramebuffer(GL_READ_FRAMEBUFFER, fb);
  83         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
  84         glBlitFramebuffer(0, 0, 1, 1,
  85                           0, 0, piglit_width, piglit_height,
  86                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
  87
  88         glBindFramebuffer(GL_FRAMEBUFFER, piglit_winsys_fbo);
  89         pass = piglit_probe_rect_rgba(0, 0, piglit_width, piglit_height, green);
  90         piglit_present_results();
  91
  92         glDeleteSamplers(1, &sampler);
  93         glDeleteTextures(1, &tex);
  94         glDeleteFramebuffers(1, &fb);
  95
  96         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
  97 }
  98
  99
 100 void
 101 piglit_init(int argc, char **argv)
 102 {
 103         piglit_require_extension("GL_ARB_sampler_objects");
 104         piglit_require_extension("GL_EXT_framebuffer_blit");
 105         piglit_require_extension("GL_EXT_texture_swizzle");
 106
 107         piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
 108 }