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authorOlivier Fourdan <ofourdan@redhat.com>2015-02-05 11:59:22 +0100
committerEric Anholt <eric@anholt.net>2015-03-24 12:43:34 -0700
commit4218a1e066cf39bb980ebbc9f69536c85232da5c (patch)
treedbf13764f61076246d094fd5fa5fe72a06ced649 /glamor
parente0788a03144186522fd0ef0e9c954e2744b40275 (diff)
glamor: check max native ALU instructions
When using glamor (either in Xephyr or Xwayland) on hardware with too low instructions limit, glamor fallbacks to sw due to large shaders. This makes glamor unbearably slow on such hardware. Check reported value for GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB and fail in glamor_init() if the limit is lower than 128. Fixes: https://bugs.freedesktop.org/show_bug.cgi?id=88316 Signed-off-by: Olivier Fourdan <ofourdan@redhat.com> Signed-off-by: Eric Anholt <eric@anholt.net> Reviewed-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'glamor')
-rw-r--r--glamor/glamor.c32
-rw-r--r--glamor/glamor_priv.h2
2 files changed, 34 insertions, 0 deletions
diff --git a/glamor/glamor.c b/glamor/glamor.c
index a6d97eadd..6f4f30927 100644
--- a/glamor/glamor.c
+++ b/glamor/glamor.c
@@ -301,6 +301,35 @@ glamor_create_screen_resources(ScreenPtr screen)
return ret;
}
+static Bool
+glamor_check_instruction_count(int gl_version)
+{
+ GLint max_native_alu_instructions;
+
+ /* Avoid using glamor if the reported instructions limit is too low,
+ * as this would cause glamor to fallback on sw due to large shaders
+ * which ends up being unbearably slow.
+ */
+ if (gl_version < 30) {
+ if (!epoxy_has_gl_extension("GL_ARB_fragment_program")) {
+ ErrorF("GL_ARB_fragment_program required\n");
+ return FALSE;
+ }
+
+ glGetProgramivARB(GL_FRAGMENT_PROGRAM_ARB,
+ GL_MAX_PROGRAM_NATIVE_ALU_INSTRUCTIONS_ARB,
+ &max_native_alu_instructions);
+ if (max_native_alu_instructions < GLAMOR_MIN_ALU_INSTRUCTIONS) {
+ LogMessage(X_WARNING,
+ "glamor requires at least %d instructions (%d reported)\n",
+ GLAMOR_MIN_ALU_INSTRUCTIONS, max_native_alu_instructions);
+ return FALSE;
+ }
+ }
+
+ return TRUE;
+}
+
/** Set up glamor for an already-configured GL context. */
Bool
glamor_init(ScreenPtr screen, unsigned int flags)
@@ -378,6 +407,9 @@ glamor_init(ScreenPtr screen, unsigned int flags)
ErrorF("Require OpenGL version 2.1 or later.\n");
goto fail;
}
+
+ if (!glamor_check_instruction_count(gl_version))
+ goto fail;
} else {
if (gl_version < 20) {
ErrorF("Require Open GLES2.0 or later.\n");
diff --git a/glamor/glamor_priv.h b/glamor/glamor_priv.h
index cd9192446..898a9348a 100644
--- a/glamor/glamor_priv.h
+++ b/glamor/glamor_priv.h
@@ -1082,4 +1082,6 @@ void glamor_xv_render(glamor_port_private *port_priv);
#include "glamor_font.h"
+#define GLAMOR_MIN_ALU_INSTRUCTIONS 128 /* Minimum required number of native ALU instructions */
+
#endif /* GLAMOR_PRIV_H */