mesa: Add support for GL_ARB_debug_output with dynamic ID allocation.

We can emit messages now without always having to use the same ID for
each, or having a giant table of all possible errors in mtypes.h.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>

src/mesa/main/errors.c

@@ -36,8 +36,11 @@
 #include "hash.h"
 #include "mtypes.h"
 #include "version.h"
+#include "hash_table.h"
+#include "glapi/glthread.h"
 
-
+_glthread_DECLARE_STATIC_MUTEX(DynamicIDMutex);
+static GLuint NextDynamicID = 1;
 
 struct gl_debug_severity
 {
@@ -107,6 +110,30 @@ gl_enum_to_debug_severity(GLenum e)
    return i;
 }
 
+/**
+ * Handles generating a GL_ARB_debug_output message ID generated by the GL or
+ * GLSL compiler.
+ *
+ * The GL API has this "ID" mechanism, where the intention is to allow a
+ * client to filter in/out messages based on source, type, and ID.  Of course,
+ * building a giant enum list of all debug output messages that Mesa might
+ * generate is ridiculous, so instead we have our caller pass us a pointer to
+ * static storage where the ID should get stored.  This ID will be shared
+ * across all contexts for that message (which seems like a desirable
+ * property, even if it's not expected by the spec), but note that it won't be
+ * the same between executions if messages aren't generated in the same order.
+ */
+static void
+debug_get_id(GLuint *id)
+{
+   if (!(*id)) {
+      _glthread_LOCK_MUTEX(DynamicIDMutex);
+      if (!(*id))
+         *id = NextDynamicID++;
+      _glthread_UNLOCK_MUTEX(DynamicIDMutex);
+   }
+}
+
 /*
  * We store a bitfield in the hash table, with five possible values total.
  *
@@ -682,8 +709,8 @@ _mesa_free_errors_data(struct gl_context *ctx)
    /* Tear down state for filtering debug messages. */
    for (s = 0; s < MESA_DEBUG_SOURCE_COUNT; s++)
       for (t = 0; t < MESA_DEBUG_TYPE_COUNT; t++) {
-         _mesa_HashDeleteAll(ClientIDs->Namespaces[s][t].IDs, do_nothing, NULL);
+         _mesa_HashDeleteAll(ctx->Debug.Namespaces[s][t].IDs, do_nothing, NULL);
-         _mesa_DeleteHashTable(ClientIDs->Namespaces[s][t].IDs);
+         _mesa_DeleteHashTable(ctx->Debug.Namespaces[s][t].IDs);
          for (sev = 0; sev < MESA_DEBUG_SEVERITY_COUNT; sev++) {
             struct simple_node *node, *tmp;
             struct gl_debug_severity *entry;
@@ -859,6 +886,27 @@ should_output(struct gl_context *ctx, GLenum error, const char *fmtString)
    return GL_FALSE;
 }
 
+void
+_mesa_gl_debug(struct gl_context *ctx,
+               GLuint *id,
+               enum mesa_debug_type type,
+               enum mesa_debug_severity severity,
+               const char *fmtString, ...)
+{
+   char s[MAX_DEBUG_MESSAGE_LENGTH];
+   int len;
+   va_list args;
+
+   debug_get_id(id);
+
+   va_start(args, fmtString);
+   len = _mesa_vsnprintf(s, MAX_DEBUG_MESSAGE_LENGTH, fmtString, args);
+   va_end(args);
+
+   _mesa_log_msg(ctx, MESA_DEBUG_SOURCE_API, type,
+                 *id, severity, len, s);
+}
+
 
 /**
  * Record an OpenGL state error.  These usually occur when the user

src/mesa/main/errors.h

@@ -44,8 +44,9 @@
 extern "C" {
 #endif
 
+#include "mtypes.h"
+
 struct _glapi_table;
-struct gl_context;
 
 extern void
 _mesa_init_errors( struct gl_context *ctx );
@@ -65,6 +66,13 @@ _mesa_error( struct gl_context *ctx, GLenum error, const char *fmtString, ... )
 extern void
 _mesa_debug( const struct gl_context *ctx, const char *fmtString, ... ) PRINTFLIKE(2, 3);
 
+extern void
+_mesa_gl_debug(struct gl_context *ctx,
+               GLuint *id,
+               enum mesa_debug_type type,
+               enum mesa_debug_severity severity,
+               const char *fmtString, ...) PRINTFLIKE(5, 6);
+
 extern void
 _mesa_shader_debug( struct gl_context *ctx, GLenum type, GLuint id, const char *msg, int len );