There are a couple cases where a single shader might happen:
- compute shaders
(only one stage, no inputs and outputs; separable shouldn't matter)
- vertex shaders with transform feedback
(we want to retain outputs, but transform feedback varyings are
specified via the API, not the shader - setting SSO fixes this)
- old shader_test files captured before we started adding "SSO ENABLED".
In any case, it seems harmless or beneficial to enable SSO for all
.shader_test files containing a single shader.
Based on a patch by Marek.
---
run.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/run.c b/run.c
index 024c8e9..f6ce1bf 100644
--- a/run.c
+++ b/run.c
@@ -633,6 +633,12 @@ main(int argc, char **argv)
}
ctx_is_core = type == TYPE_CORE;
+ /* If there's only one shader, mark it separable so inputs
+ * and outputs aren't eliminated.
+ */
+ if (num_shaders == 1)
+ use_separate_shader_objects = true;
+
if (type == TYPE_CORE || type == TYPE_COMPAT) {
GLuint prog = glCreateProgram();
--
2.9.0
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