There is a hardware bug in i965/gen9+ with provoking vertices.
Test if workaround works correctly.
Ref:
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.freedesktop.org%2Fshow_bug.cgi%3Fid%3D103047&data=02%7C01%7Cbrianp%40vmware.com%7Cf6ec4bfb4928411d446708d5d1db05bf%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C1%7C1%7C636645660990175348&sdata=1XPX5QNMBxDkNPHQnH9ydaq5NjCqBdDmWId5pl0vnb8%3D&reserved=0
v2: - Vertices now have distinctive color
- Update message to reflect a nature of the bug which was
clarified by Kenneth. He will also provide workaround later.
Signed-off-by: Danylo Piliaiev <danylo.pilia...@globallogic.com>
---
tests/opengl.py | 1 +
tests/spec/arb_provoking_vertex/CMakeLists.gl.txt | 1 +
.../clipped-geometry-flatshading.c | 81 ++++++++++++++++++++++
3 files changed, 83 insertions(+)
create mode 100644
tests/spec/arb_provoking_vertex/clipped-geometry-flatshading.c
diff --git a/tests/opengl.py b/tests/opengl.py
index 3109a5e..313b22b 100644
--- a/tests/opengl.py
+++ b/tests/opengl.py
@@ -2205,6 +2205,7 @@ with profile.test_list.group_manager(
g(['arb-provoking-vertex-control'], run_concurrent=False)
g(['arb-provoking-vertex-initial'], run_concurrent=False)
g(['arb-provoking-vertex-render'], run_concurrent=False)
+ g(['arb-provoking-vertex-clipped-geometry-flatshading'],
run_concurrent=False)
g(['arb-quads-follow-provoking-vertex'], run_concurrent=False)
g(['arb-xfb-before-flatshading'], run_concurrent=False)
diff --git a/tests/spec/arb_provoking_vertex/CMakeLists.gl.txt b/tests/spec/arb_provoking_vertex/CMakeLists.gl.txt
index 6dd15bb..3acffc6 100644
--- a/tests/spec/arb_provoking_vertex/CMakeLists.gl.txt
+++ b/tests/spec/arb_provoking_vertex/CMakeLists.gl.txt
@@ -11,6 +11,7 @@ link_libraries (
piglit_add_executable (arb-provoking-vertex-control
provoking-vertex-control.c)
piglit_add_executable (arb-provoking-vertex-initial
provoking-vertex-initial.c)
piglit_add_executable (arb-provoking-vertex-render render.c)
+piglit_add_executable (arb-provoking-vertex-clipped-geometry-flatshading
clipped-geometry-flatshading.c)
piglit_add_executable (arb-quads-follow-provoking-vertex
quads-follow-provoking-vertex.c)
piglit_add_executable (arb-xfb-before-flatshading xfb-before-flatshading.c)
diff --git a/tests/spec/arb_provoking_vertex/clipped-geometry-flatshading.c b/tests/spec/arb_provoking_vertex/clipped-geometry-flatshading.c
new file mode 100644
index 0000000..72acb4d
--- /dev/null
+++ b/tests/spec/arb_provoking_vertex/clipped-geometry-flatshading.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright © 2018 Danylo Piliaiev
+ *
+ * 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.
+ */
+
+/**
+ * Test that provoking vertex works as expected when part of the geometry
+ * is clipped when flat shading is enabled.
+ *
+ *
https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugs.freedesktop.org%2Fshow_bug.cgi%3Fid%3D103047&data=02%7C01%7Cbrianp%40vmware.com%7Cf6ec4bfb4928411d446708d5d1db05bf%7Cb39138ca3cee4b4aa4d6cd83d9dd62f0%7C1%7C1%7C636645660990175348&sdata=1XPX5QNMBxDkNPHQnH9ydaq5NjCqBdDmWId5pl0vnb8%3D&reserved=0
+ */
+
+#include "piglit-util-gl.h"
+
+PIGLIT_GL_TEST_CONFIG_BEGIN
+ config.supports_gl_compat_version = 10;
+ config.khr_no_error_support = PIGLIT_NO_ERRORS;
+PIGLIT_GL_TEST_CONFIG_END
+
+void
+piglit_init(int argc, char **argv)
+{
+ piglit_require_extension("GL_EXT_provoking_vertex");
+ piglit_ortho_projection(piglit_width, piglit_height, GL_FALSE);
+
+ glShadeModel(GL_FLAT);
+}
+
+enum piglit_result
+piglit_display(void)
+{
+ static const float red[3] = {1, 0, 0},
+ green[3] = {0, 1, 0},
+ blue[3] = {0, 0, 1},
+ yellow[3] = {1, 1, 0},
+ cyan[3] = {0, 1, 1};
+
+ bool pass = true;
+
+ glClear(GL_COLOR_BUFFER_BIT);
+ glProvokingVertexEXT(GL_LAST_VERTEX_CONVENTION_EXT);
+
+ const int y1 = piglit_height / 3;
+
+ glBegin(GL_TRIANGLE_STRIP);
+ glColor3fv(cyan);
+ glVertex3i(piglit_width + 1, y1, 0);
+ glColor3fv(yellow);
+ glVertex3i(piglit_width + 2, y1, 0);
+ glColor3fv(blue);
+ glVertex3i(piglit_width + 3, y1, 0);
+ glColor3fv(green);
+ glVertex3i(piglit_width / 2, y1 * 2, 0);
+ glColor3fv(red);
+ glVertex3i(piglit_width - 1, y1 * 2, 0);
+ glEnd();
+
+ pass = pass && piglit_probe_pixel_rgb(piglit_width - 2, y1 * 3 / 2,
red);
+
+ piglit_present_results();
+
+ return pass ? PIGLIT_PASS : PIGLIT_FAIL;
+}
