[Piglit] [PATCH] polygon-line-aa test case added.

[Dylan Baker]

This test won't actually get run unless its added to tests/all.py

You probably also should put a license header in the source file. MIT is the 
usual license.

On Wednesday, June 11, 2014 11:57:24 AM Iago Toral Quiroga wrote:
> This tests correct rendering of polygons using antialised GL_LINE mode for
> one face and GL_FILL for the other one. On some Intel hardware at least
> this used to require special handling that has caused regressions in the
> past.
> 
> The test checks that the GL_FILL face of the polygon renders properly.
> ---
>  tests/bugs/CMakeLists.gl.txt |  1 +
>  tests/bugs/polygon-line-aa.c | 70
> ++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 71
> insertions(+)
>  create mode 100644 tests/bugs/polygon-line-aa.c
> 
> diff --git a/tests/bugs/CMakeLists.gl.txt b/tests/bugs/CMakeLists.gl.txt
> index e24ec6b..fd71c0f 100644
> --- a/tests/bugs/CMakeLists.gl.txt
> +++ b/tests/bugs/CMakeLists.gl.txt
> @@ -30,5 +30,6 @@ piglit_add_executable (fdo28551 fdo28551.c)
>  piglit_add_executable (fdo31934 fdo31934.c)
>  piglit_add_executable (tri-tex-crash tri-tex-crash.c)
>  piglit_add_executable (vbo-buffer-unmap vbo-buffer-unmap.c)
> +piglit_add_executable (polygon-aa polygon-line-aa.c)
> 
>  # vim: ft=cmake:
> diff --git a/tests/bugs/polygon-line-aa.c b/tests/bugs/polygon-line-aa.c
> new file mode 100644
> index 0000000..3aef97c
> --- /dev/null
> +++ b/tests/bugs/polygon-line-aa.c
> @@ -0,0 +1,70 @@
> +/*
> + * Test case for a special case of line antialiasing
> + * https://bugs.freedesktop.org/show_bug.cgi?id=78679
> + *
> + * This test renders a polygon using GL_LINE mode (with antialised lines)
> + * for one face of the polygon, and GL_FILL for the other face. For gen < 6
> + * intel hardware this setup requires special handling that if not done +
> * correctly produces incorrect rendering of the GL_FILL face. This caused +
> * regressions in the past.
> + */
> +
> +#include "piglit-util-gl-common.h"
> +
> +PIGLIT_GL_TEST_CONFIG_BEGIN
> +
> +   config.supports_gl_compat_version = 10;
> +   config.window_width = 100;
> +   config.window_height = 100;
> +   config.window_visual = PIGLIT_GL_VISUAL_RGBA;
> +
> +PIGLIT_GL_TEST_CONFIG_END
> +
> +void
> +piglit_init(int argc, char **argv)
> +{
> +   /* This enables the case we want to test for */
> +   glEnable(GL_LINE_SMOOTH);
> +   glShadeModel(GL_SMOOTH);
> +   glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
> +   glLineWidth(1.5);
> +   glEnable(GL_BLEND);
> +   glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
> +   glPolygonMode(GL_BACK, GL_LINE);
> +
> +   glMatrixMode(GL_PROJECTION);
> +   glLoadIdentity();
> +   glOrtho(0.0, 1.0, 0.0, 1.0, -1.0, 1.0);
> +
> +   glClearColor(1, 1, 1, 1);
> +}
> +
> +enum piglit_result
> +piglit_display(void)
> +{
> +   glClear(GL_COLOR_BUFFER_BIT);
> +
> +   glViewport(0, 0, piglit_width, piglit_height);
> +
> +   glMatrixMode(GL_MODELVIEW);
> +   glLoadIdentity();
> +
> +   glColor4f(0.0f, 0.0f, 1.0f, 1.0);
> +   glBegin(GL_QUADS);
> +      glVertex2f(-1.0f, -1.0f);
> +      glVertex2f( 1.0f, -1.0f);
> +      glVertex2f( 1.0f,  1.0f);
> +      glVertex2f(-1.0f,  1.0f);
> +   glEnd();
> +
> +   glFlush();
> +
> +   /* The test checks that the fill face of the quad is all blue without
> +    * noise artifacts
> +    */
> +   GLfloat expected[4] = { 0.0, 0.0, 1.0, 1.0 };
> +   if (piglit_probe_rect_rgba(0, 0, 100, 100, expected))
> +      return PIGLIT_PASS;
> +   else
> +      return PIGLIT_FAIL;
> +}
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