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#include <cogl/cogl.h>
#include <glib.h>
#include <stdio.h>
typedef struct _Data
{
CoglContext *ctx;
CoglFramebuffer *fb;
CoglPrimitive *triangle;
CoglPipeline *pipeline;
} Data;
static CoglBool
paint_cb (void *user_data)
{
Data *data = user_data;
cogl_framebuffer_clear4f (data->fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);
cogl_framebuffer_draw_primitive (data->fb, data->pipeline, data->triangle);
cogl_onscreen_swap_buffers (COGL_ONSCREEN (data->fb));
/* If the driver can deliver swap complete events then we can remove
* the idle paint callback until we next get a swap complete event
* otherwise we keep the idle paint callback installed and simply
* paint as fast as the driver will allow... */
if (cogl_has_feature (data->ctx, COGL_FEATURE_ID_SWAP_BUFFERS_EVENT))
return FALSE; /* remove the callback */
else
return TRUE;
}
static void
swap_complete_cb (CoglFramebuffer *framebuffer, void *user_data)
{
g_idle_add (paint_cb, user_data);
}
int
main (int argc, char **argv)
{
Data data;
CoglOnscreen *onscreen;
GError *error = NULL;
CoglVertexP2C4 triangle_vertices[] = {
{0, 0.7, 0xff, 0x00, 0x00, 0x80},
{-0.7, -0.7, 0x00, 0xff, 0x00, 0xff},
{0.7, -0.7, 0x00, 0x00, 0xff, 0xff}
};
GSource *cogl_source;
GMainLoop *loop;
data.ctx = cogl_context_new (NULL, &error);
if (!data.ctx) {
fprintf (stderr, "Failed to create context: %s\n", error->message);
return 1;
}
onscreen = cogl_onscreen_new (data.ctx, 640, 480);
cogl_onscreen_show (onscreen);
data.fb = COGL_FRAMEBUFFER (onscreen);
cogl_onscreen_set_resizable (onscreen, TRUE);
data.triangle = cogl_primitive_new_p2c4 (data.ctx,
COGL_VERTICES_MODE_TRIANGLES,
3, triangle_vertices);
data.pipeline = cogl_pipeline_new (data.ctx);
cogl_source = cogl_glib_source_new (data.ctx, G_PRIORITY_DEFAULT);
g_source_attach (cogl_source, NULL);
if (cogl_has_feature (data.ctx, COGL_FEATURE_ID_SWAP_BUFFERS_EVENT))
cogl_onscreen_add_swap_buffers_callback (COGL_ONSCREEN (data.fb),
swap_complete_cb, &data);
g_idle_add (paint_cb, &data);
loop = g_main_loop_new (NULL, TRUE);
g_main_loop_run (loop);
return 0;
}
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