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cogl-hello: use glib mainloop for portability

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To be a portable example this updates cogl-hello to use the glib
mainloop instead of using g_poll. On OSX we plan to provide custom
mainloop integration for glib which can't be abstracted by just using
g_poll.
This commit is contained in:
Robert Bragg 2012-03-05 12:24:38 +00:00
parent 5eb62ad1d9
commit ae091f2cbb
1 changed files with 52 additions and 23 deletions
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75
examples/cogl-hello.c
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@ -2,51 +2,80 @@
#include <glib.h> #include <glib.h>
#include <stdio.h> #include <stdio.h>
CoglColor black; typedef struct _Data
{
CoglContext *ctx;
CoglFramebuffer *fb;
CoglPrimitive *triangle;
CoglPipeline *pipeline;
} Data;
static gboolean
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 int
main (int argc, char **argv) main (int argc, char **argv)
{ {
CoglContext *ctx; Data data;
CoglOnscreen *onscreen; CoglOnscreen *onscreen;
CoglFramebuffer *fb;
CoglPipeline *pipeline;
GError *error = NULL; GError *error = NULL;
CoglVertexP2C4 triangle_vertices[] = { CoglVertexP2C4 triangle_vertices[] = {
{0, 0.7, 0xff, 0x00, 0x00, 0x80}, {0, 0.7, 0xff, 0x00, 0x00, 0x80},
{-0.7, -0.7, 0x00, 0xff, 0x00, 0xff}, {-0.7, -0.7, 0x00, 0xff, 0x00, 0xff},
{0.7, -0.7, 0x00, 0x00, 0xff, 0xff} {0.7, -0.7, 0x00, 0x00, 0xff, 0xff}
}; };
CoglPrimitive *triangle; GSource *cogl_source;
GMainLoop *loop;
ctx = cogl_context_new (NULL, &error); data.ctx = cogl_context_new (NULL, &error);
if (!ctx) { if (!data.ctx) {
fprintf (stderr, "Failed to create context: %s\n", error->message); fprintf (stderr, "Failed to create context: %s\n", error->message);
return 1; return 1;
} }
onscreen = cogl_onscreen_new (ctx, 640, 480); onscreen = cogl_onscreen_new (data.ctx, 640, 480);
cogl_onscreen_show (onscreen); cogl_onscreen_show (onscreen);
fb = COGL_FRAMEBUFFER (onscreen); data.fb = COGL_FRAMEBUFFER (onscreen);
triangle = cogl_primitive_new_p2c4 (ctx, COGL_VERTICES_MODE_TRIANGLES, data.triangle = cogl_primitive_new_p2c4 (data.ctx,
3, triangle_vertices); COGL_VERTICES_MODE_TRIANGLES,
3, triangle_vertices);
data.pipeline = cogl_pipeline_new (data.ctx);
pipeline = cogl_pipeline_new (ctx); cogl_source = cogl_glib_source_new (data.ctx, G_PRIORITY_DEFAULT);
for (;;) { g_source_attach (cogl_source, NULL);
CoglPollFD *poll_fds;
int n_poll_fds;
gint64 timeout;
cogl_framebuffer_clear4f (fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1); if (cogl_has_feature (data.ctx, COGL_FEATURE_ID_SWAP_BUFFERS_EVENT))
cogl_framebuffer_draw_primitive (fb, pipeline, triangle); cogl_onscreen_add_swap_buffers_callback (COGL_ONSCREEN (data.fb),
cogl_onscreen_swap_buffers (onscreen); swap_complete_cb, &data);
cogl_poll_get_info (ctx, &poll_fds, &n_poll_fds, &timeout); g_idle_add (paint_cb, &data);
g_poll ((GPollFD *) poll_fds, n_poll_fds, 0);
cogl_poll_dispatch (ctx, poll_fds, n_poll_fds); loop = g_main_loop_new (NULL, TRUE);
} g_main_loop_run (loop);
return 0; return 0;
} }