vc4: Add the necessary stubs for occlusion queries.

We have to expose them for GL 2.0, but we just always return a value of 0.
We should be advertising 0 query bits instead of 64, but gallium doesn't
have plumbing for that yet.  At least this stops the segfaults.

1 files changed, 83 insertions, 0 deletions

diff --git a/src/gallium/drivers/vc4/vc4_query.c b/src/gallium/drivers/vc4/vc4_query.c
new file mode 100644
index 00000000000..1792becb08f
--- /dev/null
+++ b/src/gallium/drivers/vc4/vc4_query.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright © 2014 Broadcom
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+/**
+ * Stub support for occlusion queries.
+ *
+ * Since we expose support for GL 2.0, we have to expose occlusion queries,
+ * but the spec allows you to expose 0 query counter bits, so we just return 0
+ * as the result of all our queries.
+ */
+#include "vc4_context.h"
+
+struct vc4_query
+{
+        uint8_t pad;
+};
+
+static struct pipe_query *
+vc4_create_query(struct pipe_context *ctx, unsigned query_type, unsigned index)
+{
+        struct vc4_query *query = calloc(1, sizeof(*query));
+
+        /* Note that struct pipe_query isn't actually defined anywhere. */
+        return (struct pipe_query *)query;
+}
+
+static void
+vc4_destroy_query(struct pipe_context *ctx, struct pipe_query *query)
+{
+        free(query);
+}
+
+static void
+vc4_begin_query(struct pipe_context *ctx, struct pipe_query *query)
+{
+}
+
+static void
+vc4_end_query(struct pipe_context *ctx, struct pipe_query *query)
+{
+}
+
+static boolean
+vc4_get_query_result(struct pipe_context *ctx, struct pipe_query *query,
+                     boolean wait, union pipe_query_result *vresult)
+{
+        uint64_t *result = &vresult->u64;
+
+        *result = 0;
+
+        return true;
+}
+
+void
+vc4_query_init(struct pipe_context *pctx)
+{
+        pctx->create_query = vc4_create_query;
+        pctx->destroy_query = vc4_destroy_query;
+        pctx->begin_query = vc4_begin_query;
+        pctx->end_query = vc4_end_query;
+        pctx->get_query_result = vc4_get_query_result;
+}
+