Alpha-to-one only makes sense when used with alpha-to-coverage. This
patch adds a flag to the alpha-to-coverage test to exercise alpha-to-one.
This will fail with drivers which emulate alpha-to-one in the FS.
---
tests/all.py | 4 ++++
.../ext_framebuffer_multisample/sample-alpha-to-coverage.cpp | 11 ++++++++---
2 files changed, 12 insertions(+), 3 deletions(-)
diff --git a/tests/all.py b/tests/all.py
index ae55425..abe6185 100644
--- a/tests/all.py
+++ b/tests/all.py
@@ -3044,6 +3044,10 @@ with profile.test_list.group_manager(
sample_count, buffer_type],
'sample-alpha-to-coverage {} {}'.format(
sample_count, buffer_type))
+ g(['ext_framebuffer_multisample-sample-alpha-to-coverage',
+ sample_count, buffer_type, '--alpha-to-one'],
+ 'sample-alpha-to-coverage-alpha-to-one {} {}'.format(
+ sample_count, buffer_type))
for test in ['line-smooth', 'point-smooth', 'polygon-smooth',
'sample-alpha-to-one',
diff --git
a/tests/spec/ext_framebuffer_multisample/sample-alpha-to-coverage.cpp
b/tests/spec/ext_framebuffer_multisample/sample-alpha-to-coverage.cpp
index 7b756ba..32b4161 100644
--- a/tests/spec/ext_framebuffer_multisample/sample-alpha-to-coverage.cpp
+++ b/tests/spec/ext_framebuffer_multisample/sample-alpha-to-coverage.cpp
@@ -54,11 +54,12 @@ PIGLIT_GL_TEST_CONFIG_BEGIN
PIGLIT_GL_TEST_CONFIG_END
static GLenum buffer_to_test;
+static bool alpha_to_one = false;
void
print_usage_and_exit(char *prog_name)
{
- printf("Usage: %s <num_samples> <test_type>\n"
+ printf("Usage: %s <num_samples> <test_type> [--alpha-to-one]\n"
" where <test_type> is one of:\n"
" color\n"
" depth\n",
@@ -93,6 +94,10 @@ piglit_init(int argc, char **argv)
} else
print_usage_and_exit(argv[0]);
+ if (argc == 4 && strcmp(argv[3], "--alpha-to-one") == 0) {
+ alpha_to_one = true;
+ }
+
int pattern_width = piglit_width / 2;
int pattern_height = piglit_height / num_attachments;
@@ -133,10 +138,10 @@ piglit_display()
*/
if(buffer_to_test == GL_COLOR_BUFFER_BIT)
draw_reference_image(true /* sample_alpha_to_coverage */,
- false /* sample_alpha_to_one */);
+ alpha_to_one);
draw_test_image(true /* sample_alpha_to_coverage */,
- false /* sample_alpha_to_one */);
+ alpha_to_one);
pass = piglit_check_gl_error(GL_NO_ERROR) && pass;
--
1.9.1
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