[PATCH i-g-t] tests/kms_plane_alpha_blend: Reduce test complexity for simulation

[Sharma, Swati2]

Hi Pranay,

On 19-07-2025 10:38 pm, Pranay Samala wrote:
> Reduce the number of plane alpha value iterations, and limit execution
> to a single plane for each pipe to enable this test on simulation.
>
> Signed-off-by: Pranay Samala <pranay.samala at intel.com>
> ---
>   tests/kms_plane_alpha_blend.c | 13 +++++++++++--
>   1 file changed, 11 insertions(+), 2 deletions(-)
>
> diff --git a/tests/kms_plane_alpha_blend.c b/tests/kms_plane_alpha_blend.c
> index 047cc57b4..696bb1e5e 100644
> --- a/tests/kms_plane_alpha_blend.c
> +++ b/tests/kms_plane_alpha_blend.c
> @@ -79,6 +79,8 @@ typedef struct {
>   	igt_pipe_crc_t *pipe_crc;
>   } data_t;
>   
> +static bool in_simulation;
> +
>   static void __draw_gradient(struct igt_fb *fb, int w, int h, double a, cairo_t *cr)
>   {
>   	cairo_pattern_t *pat;
> @@ -289,7 +291,7 @@ static void basic_alpha(data_t *data, enum pipe pipe, igt_plane_t *plane)
>   {
>   	igt_display_t *display = &data->display;
>   	igt_crc_t ref_crc, crc;
> -	int i;
> +	int i, max_alpha_value;
>   
>   	/* Testcase 1: alpha = 0.0, plane should be transparent. */
>   	igt_display_commit2(display, COMMIT_ATOMIC);
> @@ -298,8 +300,10 @@ static void basic_alpha(data_t *data, enum pipe pipe, igt_plane_t *plane)
>   
>   	igt_plane_set_fb(plane, &data->argb_fb_0);
>   
> +	max_alpha_value = in_simulation ? 160 : 256;
> +
>   	/* transparent fb should be transparent, no matter what.. */
> -	for (i = 7; i < 256; i += 8) {
> +	for (i = 7; i < max_alpha_value; i += 8) {
>   		igt_plane_set_prop_value(plane, IGT_PLANE_ALPHA, i | (i << 8));
>   		igt_display_commit2(display, COMMIT_ATOMIC);
>   
> @@ -564,6 +568,9 @@ static void run_test_on_pipe_planes(data_t *data, enum pipe pipe, igt_output_t *
>   		igt_info("Testing plane %u\n", plane->index);
>   		test(data, pipe, plane);
>   		igt_plane_set_fb(plane, NULL);
> +
> +		if (in_simulation)
> +			break;
If we are breaking after first plane, how do we know if that plane 
supports alpha?
We need to have something like valid_plane which supports alpha and 
other constraints and then break.
That will imply, we have tested with atleast 1 plane supporting alpha 
and other constraints.
>   	}
>   
>   	igt_output_set_pipe(output, PIPE_NONE);
> @@ -743,6 +750,8 @@ igt_main_args("e", NULL, help_str, opt_handler, NULL)
>   		for_each_pipe(&data.display, pipe)
>   			active_pipes[last_pipe++] = pipe;
>   		last_pipe--;
> +
> +		in_simulation = igt_run_in_simulation();
>   	}
>   
>   	run_subtests(&data);