tests/spec/ext_framebuffer_multisample/blit-flipped.cpp

   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 /** \file blit-flipped.cpp
  25  *
  26  * From the GL 4.3 spec, section 18.3.1 "Blitting Pixel Rectangles":
  27  *
  28  *     If SAMPLE_BUFFERS for either the read framebuffer or draw
  29  *     framebuffer is greater than zero, no copy is performed and an
  30  *     INVALID_OPERATION error is generated if the dimensions of the
  31  *     source and destination rectangles provided to BlitFramebuffer
  32  *     are not identical, or if the formats of the read and draw
  33  *     framebuffers are not identical.
  34  *
  35  * It is not clear from the spec whether "dimensions" should mean both
  36  * sign and magnitude, or just magnitude.  However, Y flips are likely
  37  * to be commonplace in OpenGL applications that have been ported from
  38  * DirectX applications, as a result of the fact that DirectX and
  39  * OpenGL differ in their orientation of the Y axis.  Furthermore, at
  40  * least one commercial driver (nVidia) permits Y flips, and L4D2
  41  * relies on them being permitted.  So it seems prudent to assume that
  42  * "dimensions" means just magnitude, not sign.
  43  *
  44  * This test verifies that a blit from a multisampled buffer to a
  45  * single-sampled buffer is permitted to flip either in the X or Y
  46  * direction, and that the resulting image is the same as what would
  47  * be obtained by doing a non-flipped blit to a single-sampled buffer,
  48  * and then a second blit that performs a flip.
  49  */
  50
  51 #include "piglit-test-pattern.h"
  52 #include "piglit-fbo.h"
  53 using namespace piglit_util_fbo;
  54 using namespace piglit_util_test_pattern;
  55
  56 const int pattern_width = 256; const int pattern_height = 256;
  57
  58 PIGLIT_GL_TEST_CONFIG_BEGIN
  59
  60         config.supports_gl_compat_version = 10;
  61
  62         config.window_width = pattern_width*2;
  63         config.window_height = pattern_height;
  64         config.window_visual = PIGLIT_GL_VISUAL_DOUBLE | PIGLIT_GL_VISUAL_RGBA;
  65         config.khr_no_error_support = PIGLIT_NO_ERRORS;
  66
  67 PIGLIT_GL_TEST_CONFIG_END
  68
  69 static Fbo multisampled_fbo, singlesampled_fbo;
  70 static TestPattern *test_pattern;
  71 static GLint srcX0, srcY0, srcX1, srcY1;
  72
  73 static void
  74 print_usage_and_exit(char *prog_name)
  75 {
  76         printf("Usage: %s <num_samples> <flip_direction>\n"
  77                "  where <flip_direction> is either x or y\n",
  78                prog_name);
  79         piglit_report_result(PIGLIT_FAIL);
  80 }
  81
  82 void
  83 piglit_init(int argc, char **argv)
  84 {
  85         if (argc != 3)
  86                 print_usage_and_exit(argv[0]);
  87
  88         /* 1st arg: num_samples */
  89         char *endptr = NULL;
  90         int num_samples = strtol(argv[1], &endptr, 0);
  91         if (endptr != argv[1] + strlen(argv[1]))
  92                 print_usage_and_exit(argv[0]);
  93
  94         /* 2nd arg: flip_direction */
  95         if (strcmp(argv[2], "x") == 0) {
  96                 srcX0 = pattern_width;
  97                 srcX1 = 0;
  98                 srcY0 = 0;
  99                 srcY1 = pattern_height;
 100         } else if (strcmp(argv[2], "y") == 0) {
 101                 srcX0 = 0;
 102                 srcX1 = pattern_width;
 103                 srcY0 = pattern_height;
 104                 srcY1 = 0;
 105         } else {
 106                 print_usage_and_exit(argv[0]);
 107         }
 108
 109         piglit_require_gl_version(21);
 110         piglit_require_extension("GL_ARB_framebuffer_object");
 111         piglit_require_extension("GL_ARB_vertex_array_object");
 112
 113         /* Skip the test if num_samples > GL_MAX_SAMPLES */
 114         GLint max_samples;
 115         glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
 116         if (num_samples > max_samples)
 117                 piglit_report_result(PIGLIT_SKIP);
 118
 119         singlesampled_fbo.setup(FboConfig(0,
 120                                           pattern_width,
 121                                           pattern_height));
 122
 123         multisampled_fbo.setup(FboConfig(num_samples,
 124                                          pattern_width,
 125                                          pattern_height));
 126
 127         test_pattern = new Triangles();
 128         test_pattern->compile();
 129
 130         if (!piglit_check_gl_error(GL_NO_ERROR)) {
 131                 piglit_report_result(PIGLIT_FAIL);
 132         }
 133 }
 134
 135 enum piglit_result
 136 piglit_display()
 137 {
 138         bool pass = true;
 139
 140         /* Draw the test pattern into the multisampled buffer. */
 141         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
 142         multisampled_fbo.set_viewport();
 143         test_pattern->draw(TestPattern::no_projection);
 144
 145         /* Blit it to a single-sampled buffer, flipping the
 146          * appropriate coordinate.  This will only work if the
 147          * implementation allows multisampled blits to be flipped.
 148          */
 149         glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
 150         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
 151         glBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
 152                           0, 0, pattern_width, pattern_height,
 153                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 154         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 155
 156         /* Blit the resulting image to the screen, performing no
 157          * additional flip.  This is the test image.
 158          */
 159         glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
 160         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 161         glBlitFramebuffer(0, 0, pattern_width, pattern_height,
 162                           0, 0, pattern_width, pattern_height,
 163                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 164
 165         /* Blit the test pattern into the single-sampled buffer with
 166          * no flip.  This should always work.
 167          */
 168         glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
 169         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
 170         glBlitFramebuffer(0, 0, pattern_width, pattern_height,
 171                           0, 0, pattern_width, pattern_height,
 172                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 173
 174         /* Blit the resulting image to the screen, flipping the
 175          * appropriate coordinate, to produce the reference image.
 176          * This should always work (since it is blitting from
 177          * single-sampled to single-sampled).
 178          */
 179         glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
 180         glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
 181         glBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
 182                           pattern_width, 0, 2*pattern_width, pattern_height,
 183                           GL_COLOR_BUFFER_BIT, GL_NEAREST);
 184
 185         pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
 186
 187         /* Compare the test and reference images. */
 188         glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
 189         pass = piglit_probe_rect_halves_equal_rgba(0, 0, 2*pattern_width,
 190                                                    pattern_height) && pass;
 191
 192         piglit_present_results();
 193
 194         return pass ? PIGLIT_PASS : PIGLIT_FAIL;
 195 }