gallium: expose a debug message callback settable by context owner

This will allow gallium drivers to send messages to KHR_debug endpoints

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/gallium/auxiliary/util/u_debug.c

@@ -70,6 +70,20 @@ void _debug_vprintf(const char *format, va_list ap)
 #endif
 }
 
+void
+_pipe_debug_message(
+   struct pipe_debug_callback *cb,
+   unsigned *id,
+   enum pipe_debug_type type,
+   const char *fmt, ...)
+{
+   va_list args;
+   va_start(args, fmt);
+   if (cb && cb->debug_message)
+      cb->debug_message(cb->data, id, type, fmt, args);
+   va_end(args);
+}
+
 
 void
 debug_disable_error_message_boxes(void)

src/gallium/auxiliary/util/u_debug.h

@@ -42,6 +42,7 @@
 #include "os/os_misc.h"
 
 #include "pipe/p_format.h"
+#include "pipe/p_defines.h"
 
 
 #ifdef	__cplusplus
@@ -262,6 +263,25 @@ void _debug_assert_fail(const char *expr,
    _debug_printf("error: %s\n", __msg)
 #endif
 
+/**
+ * Output a debug log message to the debug info callback.
+ */
+#define pipe_debug_message(cb, type, fmt, ...) do { \
+   static unsigned id = 0; \
+   _pipe_debug_message(cb, &id, \
+                       PIPE_DEBUG_TYPE_ ## type, \
+                       fmt, __VA_ARGS__); \
+} while (0)
+
+struct pipe_debug_callback;
+
+void
+_pipe_debug_message(
+   struct pipe_debug_callback *cb,
+   unsigned *id,
+   enum pipe_debug_type type,
+   const char *fmt, ...) _util_printf_format(4, 5);
+
 
 /**
  * Used by debug_dump_enum and debug_dump_flags to describe symbols.

src/gallium/docs/source/context.rst

@@ -84,6 +84,9 @@ objects. They all follow simple, one-method binding calls, e.g.
     levels. This corresponds to GL's ``PATCH_DEFAULT_OUTER_LEVEL``.
   * ``default_inner_level`` is the default value for the inner tessellation
     levels. This corresponds to GL's ``PATCH_DEFAULT_INNER_LEVEL``.
+* ``set_debug_callback`` sets the callback to be used for reporting
+  various debug messages, eventually reported via KHR_debug and
+  similar mechanisms.
 
 
 Sampler Views

src/gallium/include/pipe/p_context.h

@@ -45,6 +45,7 @@ struct pipe_blit_info;
 struct pipe_box;
 struct pipe_clip_state;
 struct pipe_constant_buffer;
+struct pipe_debug_callback;
 struct pipe_depth_stencil_alpha_state;
 struct pipe_draw_info;
 struct pipe_fence_handle;
@@ -238,6 +239,13 @@ struct pipe_context {
                           const float default_outer_level[4],
                           const float default_inner_level[2]);
 
+   /**
+    * Sets the debug callback. If the pointer is null, then no callback is
+    * set, otherwise a copy of the data should be made.
+    */
+   void (*set_debug_callback)(struct pipe_context *,
+                              const struct pipe_debug_callback *);
+
    /**
     * Bind an array of shader buffers that will be used by a shader.
     * Any buffers that were previously bound to the specified range

src/gallium/include/pipe/p_defines.h

@@ -868,6 +868,18 @@ struct pipe_driver_query_group_info
    unsigned num_queries;
 };
 
+enum pipe_debug_type
+{
+   PIPE_DEBUG_TYPE_OUT_OF_MEMORY = 1,
+   PIPE_DEBUG_TYPE_ERROR,
+   PIPE_DEBUG_TYPE_SHADER_INFO,
+   PIPE_DEBUG_TYPE_PERF_INFO,
+   PIPE_DEBUG_TYPE_INFO,
+   PIPE_DEBUG_TYPE_FALLBACK,
+   PIPE_DEBUG_TYPE_CONFORMANCE,
+};
+
+
 #ifdef __cplusplus
 }
 #endif

src/gallium/include/pipe/p_state.h

@@ -684,6 +684,31 @@ struct pipe_compute_state
    unsigned req_input_mem; /**< Required size of the INPUT resource. */
 };
 
+/**
+ * Structure that contains a callback for debug messages from the driver back
+ * to the state tracker.
+ */
+struct pipe_debug_callback
+{
+   /**
+    * Callback for the driver to report debug/performance/etc information back
+    * to the state tracker.
+    *
+    * \param data       user-supplied data pointer
+    * \param id         message type identifier, if pointed value is 0, then a
+    *                   new id is assigned
+    * \param type       PIPE_DEBUG_TYPE_*
+    * \param format     printf-style format string
+    * \param args       args for format string
+    */
+   void (*debug_message)(void *data,
+                         unsigned *id,
+                         enum pipe_debug_type type,
+                         const char *fmt,
+                         va_list args);
+   void *data;
+};
+
 #ifdef __cplusplus
 }
 #endif