[Piglit] [PATCH] arb_provoking_vertex: Test flat shading with clipped geometry

[Jason Ekstrand]

Thanks for writing a test!

On Wed, Jun 13, 2018 at 3:54 AM, <danylo.piliaiev at gmail.com> wrote:

> From: Danylo Piliaiev <danylo.piliaiev at globallogic.com>
>
> Clipper can mess up provoking vertex.
> Ref: https://bugs.freedesktop.org/show_bug.cgi?id=103047
>
> Signed-off-by: Danylo Piliaiev <danylo.piliaiev at globallogic.com>
> ---
>  tests/opengl.py                                    |  1 +
>  tests/spec/arb_provoking_vertex/CMakeLists.gl.txt  |  1 +
>  .../clipped-geometry-flatshading.c                 | 78
> ++++++++++++++++++++++
>  3 files changed, 80 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..97af48b
> --- /dev/null
> +++ b/tests/spec/arb_provoking_vertex/clipped-geometry-flatshading.c
> @@ -0,0 +1,78 @@
> +/*
> + * 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://bugs.freedesktop.org/show_bug.cgi?id=103047
> + */
> +
> +#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};
> +       static const float green[3] = {0, 1, 0};
> +
> +       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(green);
> +               glVertex3i(piglit_width + 1, y1, 0);
> +               glColor3fv(green);
> +               glVertex3i(piglit_width + 2, y1, 0);
> +               glColor3fv(green);
> +               glVertex3i(piglit_width + 3, y1, 0);
> +               glColor3fv(green);
> +               glVertex3i(piglit_width / 2, y1 * 2, 0);
>

When I was experimenting with this yesterday, I found it easier to have 3
colors instead of 3.  It would probably be even better to just have 5
separate colors so you can see exactly what is going on in all cases.

--Jason


> +               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;
> +}
> --
> 2.7.4
>
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