---
tests/all.tests | 9 +
.../ext_framebuffer_multisample/CMakeLists.gl.txt | 1 +
.../ext_framebuffer_multisample/blit-flipped.cpp | 183 ++++++++++++++++++++
3 files changed, 193 insertions(+), 0 deletions(-)
create mode 100644 tests/spec/ext_framebuffer_multisample/blit-flipped.cpp
diff --git a/tests/all.tests b/tests/all.tests
index 85f2691..6f9982b 100644
--- a/tests/all.tests
+++ b/tests/all.tests
@@ -1551,6 +1551,15 @@ for num_samples in MSAA_SAMPLE_COUNTS:
ext_framebuffer_multisample[test_name] = PlainExecTest(
executable)
+for num_samples in MSAA_SAMPLE_COUNTS:
+ for flip_direction in ('x', 'y'):
+ test_name = ' '.join(['blit-flipped', str(num_samples),
+ flip_direction])
+ executable = 'ext_framebuffer_multisample-{0} -auto'.format(
+ test_name)
+ ext_framebuffer_multisample[test_name] = PlainExecTest(
+ executable)
+
# Note: the interpolation tests also check for sensible behaviour with
# non-multisampled framebuffers, so go ahead and test them with
# num_samples==0 as well.
diff --git a/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt
b/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt
index fabe229..1542b92 100644
--- a/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt
+++ b/tests/spec/ext_framebuffer_multisample/CMakeLists.gl.txt
@@ -22,6 +22,7 @@ piglit_add_executable
(ext_framebuffer_multisample-alpha-to-one-msaa-disabled co
piglit_add_executable
(ext_framebuffer_multisample-alpha-to-one-single-sample-buffer common.cpp
draw-buffers-common.cpp
alpha-to-one-single-sample-buffer.cpp)
piglit_add_executable (ext_framebuffer_multisample-bitmap common.cpp
bitmap.cpp)
+piglit_add_executable (ext_framebuffer_multisample-blit-flipped common.cpp
blit-flipped.cpp)
piglit_add_executable (ext_framebuffer_multisample-blit-mismatched-samples
common.cpp blit-mismatched-samples.cpp)
piglit_add_executable (ext_framebuffer_multisample-blit-mismatched-sizes
common.cpp blit-mismatched-sizes.cpp)
piglit_add_executable (ext_framebuffer_multisample-blit-mismatched-formats
common.cpp blit-mismatched-formats.cpp)
diff --git a/tests/spec/ext_framebuffer_multisample/blit-flipped.cpp
b/tests/spec/ext_framebuffer_multisample/blit-flipped.cpp
new file mode 100644
index 0000000..4d1250e
--- /dev/null
+++ b/tests/spec/ext_framebuffer_multisample/blit-flipped.cpp
@@ -0,0 +1,183 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/** \file blit-flipped.cpp
+ *
+ * From the GL 4.3 spec, section 18.3.1 "Blitting Pixel Rectangles":
+ *
+ * If SAMPLE_BUFFERS for either the read framebuffer or draw
+ * framebuffer is greater than zero, no copy is performed and an
+ * INVALID_OPERATION error is generated if the dimensions of the
+ * source and destination rectangles provided to BlitFramebuffer
+ * are not identical, or if the formats of the read and draw
+ * framebuffers are not identical.
+ *
+ * It is not clear from the spec whether "dimensions" should mean both
+ * sign and magnitude, or just magnitude. However, Y flips are likely
+ * to be commonplace in OpenGL applications that have been ported from
+ * DirectX applications, as a result of the fact that DirectX and
+ * OpenGL differ in their orientation of the Y axis. Furthermore, at
+ * least one commercial driver (nVidia) permits Y flips, and L4D2
+ * relies on them being permitted. So it seems prudent to assume that
+ * "dimensions" means just magnitude, not sign.
+ *
+ * This test verifies that a blit from a multisampled buffer to a
+ * single-sampled buffer is permitted to flip either in the X or Y
+ * direction, and that the resulting image is the same as what would
+ * be obtained by doing a non-flipped blit to a single-sampled buffer,
+ * and then a second blit that performs a flip.
+ */
+
+#include "common.h"
+
+const int pattern_width = 256; const int pattern_height = 256;
+
+PIGLIT_GL_TEST_MAIN(pattern_width * 2,
+ pattern_height,
+ GLUT_DOUBLE | GLUT_RGBA | GLUT_ALPHA);
+
+static Fbo multisampled_fbo, singlesampled_fbo;
+static TestPattern *test_pattern;
+static GLint srcX0, srcY0, srcX1, srcY1;
+
+static void
+print_usage_and_exit(char *prog_name)
+{
+ printf("Usage: %s <num_samples> <flip_direction>\n"
+ " where <flip_direction> is either x or y\n",
+ prog_name);
+ piglit_report_result(PIGLIT_FAIL);
+}
+
+void
+piglit_init(int argc, char **argv)
+{
+ if (argc != 3)
+ print_usage_and_exit(argv[0]);
+
+ /* 1st arg: num_samples */
+ char *endptr = NULL;
+ int num_samples = strtol(argv[1], &endptr, 0);
+ if (endptr != argv[1] + strlen(argv[1]))
+ print_usage_and_exit(argv[0]);
+
+ /* 2nd arg: flip_direction */
+ if (strcmp(argv[2], "x") == 0) {
+ srcX0 = pattern_width;
+ srcX1 = 0;
+ srcY0 = 0;
+ srcY1 = pattern_height;
+ } else if (strcmp(argv[2], "y") == 0) {
+ srcX0 = 0;
+ srcX1 = pattern_width;
+ srcY0 = pattern_height;
+ srcY1 = 0;
+ } else {
+ print_usage_and_exit(argv[0]);
+ }
+
+ piglit_require_gl_version(30);
+
+ /* Skip the test if num_samples > GL_MAX_SAMPLES */
+ GLint max_samples;
+ glGetIntegerv(GL_MAX_SAMPLES, &max_samples);
+ if (num_samples > max_samples)
+ piglit_report_result(PIGLIT_SKIP);
+
+ singlesampled_fbo.setup(FboConfig(0,
+ pattern_width,
+ pattern_height));
+
+ multisampled_fbo.setup(FboConfig(num_samples,
+ pattern_width,
+ pattern_height));
+
+ test_pattern = new Triangles();
+ test_pattern->compile();
+
+ if (!piglit_check_gl_error(GL_NO_ERROR)) {
+ piglit_report_result(PIGLIT_FAIL);
+ }
+}
+
+enum piglit_result
+piglit_display()
+{
+ bool pass = true;
+
+ /* Draw the test pattern into the multisampled buffer. */
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, multisampled_fbo.handle);
+ multisampled_fbo.set_viewport();
+ test_pattern->draw(TestPattern::no_projection);
+
+ /* Blit it to a single-sampled buffer, flipping the
+ * appropriate coordinate. This will only work if the
+ * implementation allows multisampled blits to be flipped.
+ */
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
+ glBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
+ 0, 0, pattern_width, pattern_height,
+ GL_COLOR_BUFFER_BIT, GL_NEAREST);
+ pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
+
+ /* Blit the resulting image to the screen, performing no
+ * additional flip. This is the test image.
+ */
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
+ glBlitFramebuffer(0, 0, pattern_width, pattern_height,
+ 0, 0, pattern_width, pattern_height,
+ GL_COLOR_BUFFER_BIT, GL_NEAREST);
+
+ /* Blit the test pattern into the single-sampled buffer with
+ * no flip. This should always work.
+ */
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, multisampled_fbo.handle);
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, singlesampled_fbo.handle);
+ glBlitFramebuffer(0, 0, pattern_width, pattern_height,
+ 0, 0, pattern_width, pattern_height,
+ GL_COLOR_BUFFER_BIT, GL_NEAREST);
+
+ /* Blit the resulting image to the screen, flipping the
+ * appropriate coordinate, to produce the reference image.
+ * This should always work (since it is blitting from
+ * single-sampled to single-sampled).
+ */
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, singlesampled_fbo.handle);
+ glBindFramebuffer(GL_DRAW_FRAMEBUFFER, piglit_winsys_fbo);
+ glBlitFramebuffer(srcX0, srcY0, srcX1, srcY1,
+ pattern_width, 0, 2*pattern_width, pattern_height,
+ GL_COLOR_BUFFER_BIT, GL_NEAREST);
+
+ pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
+
+ /* Compare the test and reference images. */
+ glBindFramebuffer(GL_READ_FRAMEBUFFER, piglit_winsys_fbo);
+ pass = piglit_probe_rect_halves_equal_rgba(0, 0, 2*pattern_width,
+ pattern_height) && pass;
+
+ piglit_present_results();
+
+ return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
--
1.7.7.6
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