gtk/gsk/gl/gskglprofiler.c
2017-12-21 19:12:30 +01:00

176 lines
4.1 KiB
C

#include "config.h"
#include "gskglprofilerprivate.h"
#include <epoxy/gl.h>
#define N_QUERIES 4
struct _GskGLProfiler
{
GObject parent_instance;
GdkGLContext *gl_context;
/* Creating GL queries is kind of expensive, so we pay the
* price upfront and create a circular buffer of queries
*/
GLuint gl_queries[N_QUERIES];
GLuint active_query;
gboolean has_timer : 1;
gboolean first_frame : 1;
};
enum {
PROP_GL_CONTEXT = 1,
N_PROPERTIES
};
static GParamSpec *gsk_gl_profiler_properties[N_PROPERTIES];
G_DEFINE_TYPE (GskGLProfiler, gsk_gl_profiler, G_TYPE_OBJECT)
static void
gsk_gl_profiler_finalize (GObject *gobject)
{
GskGLProfiler *self = GSK_GL_PROFILER (gobject);
glDeleteQueries (N_QUERIES, self->gl_queries);
g_clear_object (&self->gl_context);
G_OBJECT_CLASS (gsk_gl_profiler_parent_class)->finalize (gobject);
}
static void
gsk_gl_profiler_set_property (GObject *gobject,
guint prop_id,
const GValue *value,
GParamSpec *pspec)
{
GskGLProfiler *self = GSK_GL_PROFILER (gobject);
switch (prop_id)
{
case PROP_GL_CONTEXT:
self->gl_context = g_value_dup_object (value);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
gsk_gl_profiler_get_property (GObject *gobject,
guint prop_id,
GValue *value,
GParamSpec *pspec)
{
GskGLProfiler *self = GSK_GL_PROFILER (gobject);
switch (prop_id)
{
case PROP_GL_CONTEXT:
g_value_set_object (value, self->gl_context);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (gobject, prop_id, pspec);
}
}
static void
gsk_gl_profiler_class_init (GskGLProfilerClass *klass)
{
GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
gobject_class->set_property = gsk_gl_profiler_set_property;
gobject_class->get_property = gsk_gl_profiler_get_property;
gobject_class->finalize = gsk_gl_profiler_finalize;
gsk_gl_profiler_properties[PROP_GL_CONTEXT] =
g_param_spec_object ("gl-context",
"GL Context",
"The GdkGLContext used by the GL profiler",
GDK_TYPE_GL_CONTEXT,
G_PARAM_READWRITE |
G_PARAM_CONSTRUCT_ONLY |
G_PARAM_STATIC_STRINGS);
g_object_class_install_properties (gobject_class, N_PROPERTIES, gsk_gl_profiler_properties);
}
static void
gsk_gl_profiler_init (GskGLProfiler *self)
{
glGenQueries (N_QUERIES, self->gl_queries);
self->first_frame = TRUE;
self->has_timer = epoxy_has_gl_extension ("GL_ARB_timer_query");
}
GskGLProfiler *
gsk_gl_profiler_new (GdkGLContext *context)
{
g_return_val_if_fail (GDK_IS_GL_CONTEXT (context), NULL);
return g_object_new (GSK_TYPE_GL_PROFILER, "gl-context", context, NULL);
}
void
gsk_gl_profiler_begin_gpu_region (GskGLProfiler *profiler)
{
GLuint query_id;
g_return_if_fail (GSK_IS_GL_PROFILER (profiler));
if (!profiler->has_timer)
return;
query_id = profiler->gl_queries[profiler->active_query];
glBeginQuery (GL_TIME_ELAPSED, query_id);
}
guint64
gsk_gl_profiler_end_gpu_region (GskGLProfiler *profiler)
{
GLuint last_query_id;
GLint res;
GLuint64 elapsed;
g_return_val_if_fail (GSK_IS_GL_PROFILER (profiler), 0);
if (!profiler->has_timer)
return 0;
glEndQuery (GL_TIME_ELAPSED);
if (profiler->active_query == 0)
last_query_id = N_QUERIES - 1;
else
last_query_id = profiler->active_query - 1;
/* Advance iterator */
profiler->active_query += 1;
if (profiler->active_query == N_QUERIES)
profiler->active_query = 0;
/* If this is the first frame we already have a result */
if (profiler->first_frame)
{
profiler->first_frame = FALSE;
return 0;
}
glGetQueryObjectiv (profiler->gl_queries[last_query_id], GL_QUERY_RESULT_AVAILABLE, &res);
if (res == 1)
glGetQueryObjectui64v (profiler->gl_queries[last_query_id], GL_QUERY_RESULT, &elapsed);
else
elapsed = 0;
return elapsed;
}