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mutter-performance-source/examples/cogl-hello.c
Robert Bragg 6436cd073d Declare interface types as void and remove cast macros
This declares the interface types CoglFramebuffer, CoglBuffer,
CoglTexture, CoglMetaTexture and CoglPrimitiveTexture as void when
including the public cogl.h header so that users don't have to use lots
of C type casts between instance types and interface types.

This also removes all of the COGL_XYZ() type cast macros since they do
nothing more than compile time type casting but it's less readable if
you haven't seen that coding pattern before.

Unlike with gobject based apis that use per-type macros for casting and
performing runtime type checking we instead prefer to do our runtime
type checking internally within the front-end public apis when objects
are passed into Cogl. This greatly reduces the verbosity for users of
the api and may help reduce the chance of excessive runtime type
checking that can sometimes be a problem.

(cherry picked from commit 248a76f5eac7e5ae4fb45208577f9a55360812a7)

Since we can't break the 1.x api this version of the patch actually
defines compatible NOP macros within deprecated/cogl-type-casts.h
2013-11-27 19:33:44 +00:00

123 lines
3.1 KiB
C

#include <cogl/cogl.h>
#include <glib.h>
#include <stdio.h>
typedef struct _Data
{
CoglContext *ctx;
CoglFramebuffer *fb;
CoglPrimitive *triangle;
CoglPipeline *pipeline;
unsigned int redraw_idle;
CoglBool is_dirty;
CoglBool draw_ready;
} Data;
static gboolean
paint_cb (void *user_data)
{
Data *data = user_data;
data->redraw_idle = 0;
data->is_dirty = FALSE;
data->draw_ready = FALSE;
cogl_framebuffer_clear4f (data->fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);
cogl_primitive_draw (data->triangle,
data->fb,
data->pipeline);
cogl_onscreen_swap_buffers (data->fb);
return G_SOURCE_REMOVE;
}
static void
maybe_redraw (Data *data)
{
if (data->is_dirty && data->draw_ready && data->redraw_idle == 0) {
/* We'll draw on idle instead of drawing immediately so that
* if Cogl reports multiple dirty rectangles we won't
* redundantly draw multiple frames */
data->redraw_idle = g_idle_add (paint_cb, data);
}
}
static void
frame_event_cb (CoglOnscreen *onscreen,
CoglFrameEvent event,
CoglFrameInfo *info,
void *user_data)
{
Data *data = user_data;
if (event == COGL_FRAME_EVENT_SYNC) {
data->draw_ready = TRUE;
maybe_redraw (data);
}
}
static void
dirty_cb (CoglOnscreen *onscreen,
const CoglOnscreenDirtyInfo *info,
void *user_data)
{
Data *data = user_data;
data->is_dirty = TRUE;
maybe_redraw (data);
}
int
main (int argc, char **argv)
{
Data data;
CoglOnscreen *onscreen;
CoglError *error = NULL;
CoglVertexP2C4 triangle_vertices[] = {
{0, 0.7, 0xff, 0x00, 0x00, 0xff},
{-0.7, -0.7, 0x00, 0xff, 0x00, 0xff},
{0.7, -0.7, 0x00, 0x00, 0xff, 0xff}
};
GSource *cogl_source;
GMainLoop *loop;
data.redraw_idle = 0;
data.is_dirty = FALSE;
data.draw_ready = TRUE;
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 = 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);
cogl_onscreen_add_frame_callback (data.fb,
frame_event_cb,
&data,
NULL); /* destroy notify */
cogl_onscreen_add_dirty_callback (data.fb,
dirty_cb,
&data,
NULL); /* destroy notify */
loop = g_main_loop_new (NULL, TRUE);
g_main_loop_run (loop);
return 0;
}