mesa: Custom thread marshalling for ShaderSource.

Acked-by: Timothy Arceri <[email protected]>
Acked-by: Marek Olšák <[email protected]>
Tested-by: Dieter Nützel <[email protected]>
Tested-by: Mike Lothian <[email protected]>

1 files changed, 123 insertions, 0 deletions

diff --git a/src/mesa/main/marshal.c b/src/mesa/main/marshal.c
new file mode 100644
index 00000000000..c0760d25518
--- /dev/null
+++ b/src/mesa/main/marshal.c
@@ -0,0 +1,123 @@
+/*
+ * Copyright © 2012 Intel Corporation
+ *
+ * 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.
+ */
+
+/** \file marshal.c
+ *
+ * Custom functions for marshalling GL calls from the main thread to a worker
+ * thread when automatic code generation isn't appropriate.
+ */
+
+#include "marshal.h"
+#include "dispatch.h"
+#include "marshal_generated.h"
+
+struct marshal_cmd_ShaderSource
+{
+   struct marshal_cmd_base cmd_base;
+   GLuint shader;
+   GLsizei count;
+   /* Followed by GLint length[count], then the contents of all strings,
+    * concatenated.
+    */
+};
+
+
+void
+_mesa_unmarshal_ShaderSource(struct gl_context *ctx,
+                             const struct marshal_cmd_ShaderSource *cmd)
+{
+   const GLint *cmd_length = (const GLint *) (cmd + 1);
+   const GLchar *cmd_strings = (const GLchar *) (cmd_length + cmd->count);
+   /* TODO: how to deal with malloc failure? */
+   const GLchar * *string = malloc(cmd->count * sizeof(const GLchar *));
+   int i;
+
+   for (i = 0; i < cmd->count; ++i) {
+      string[i] = cmd_strings;
+      cmd_strings += cmd_length[i];
+   }
+   CALL_ShaderSource(ctx->CurrentServerDispatch,
+                     (cmd->shader, cmd->count, string, cmd_length));
+   free(string);
+}
+
+
+static size_t
+measure_ShaderSource_strings(GLsizei count, const GLchar * const *string,
+                             const GLint *length_in, GLint *length_out)
+{
+   int i;
+   size_t total_string_length = 0;
+
+   for (i = 0; i < count; ++i) {
+      if (length_in == NULL || length_in[i] < 0) {
+         if (string[i])
+            length_out[i] = strlen(string[i]);
+      } else {
+         length_out[i] = length_in[i];
+      }
+      total_string_length += length_out[i];
+   }
+   return total_string_length;
+}
+
+
+void GLAPIENTRY
+_mesa_marshal_ShaderSource(GLuint shader, GLsizei count,
+                           const GLchar * const *string, const GLint *length)
+{
+   /* TODO: how to report an error if count < 0? */
+
+   GET_CURRENT_CONTEXT(ctx);
+   /* TODO: how to deal with malloc failure? */
+   const size_t fixed_cmd_size = sizeof(struct marshal_cmd_ShaderSource);
+   STATIC_ASSERT(sizeof(struct marshal_cmd_ShaderSource) % sizeof(GLint) == 0);
+   size_t length_size = count * sizeof(GLint);
+   GLint *length_tmp = malloc(length_size);
+   size_t total_string_length =
+      measure_ShaderSource_strings(count, string, length, length_tmp);
+   size_t total_cmd_size = fixed_cmd_size + length_size + total_string_length;
+
+   if (total_cmd_size <= MARSHAL_MAX_CMD_SIZE) {
+      struct marshal_cmd_ShaderSource *cmd =
+         _mesa_glthread_allocate_command(ctx, DISPATCH_CMD_ShaderSource,
+                                         total_cmd_size);
+      GLint *cmd_length = (GLint *) (cmd + 1);
+      GLchar *cmd_strings = (GLchar *) (cmd_length + count);
+      int i;
+
+      cmd->shader = shader;
+      cmd->count = count;
+      memcpy(cmd_length, length_tmp, length_size);
+      for (i = 0; i < count; ++i) {
+         memcpy(cmd_strings, string[i], cmd_length[i]);
+         cmd_strings += cmd_length[i];
+      }
+      _mesa_post_marshal_hook(ctx);
+   } else {
+      _mesa_glthread_finish(ctx);
+      CALL_ShaderSource(ctx->CurrentServerDispatch,
+                        (shader, count, string, length_tmp));
+   }
+   free(length_tmp);
+}