mutter/examples/cogl-sdl-hello.c
Robert Bragg 04ec48ca53 build the sdl examples when glib is disabled
This SDL example were unnecessarily including <glib.h> but they don't
actually depend on glib so now they are built even if Cogl is being
built with --disable-glib.

(cherry picked from commit 1d3bce7f68b0a6885c10a29cd9836a3541a1b653)
2013-01-22 17:47:58 +00:00

128 lines
2.8 KiB
C

#include <cogl/cogl.h>
#include <stdio.h>
#include <SDL.h>
/* This short example is just to demonstrate mixing SDL with Cogl as a
simple way to get portable support for events */
typedef struct Data
{
CoglPrimitive *triangle;
CoglPipeline *pipeline;
float center_x, center_y;
CoglFramebuffer *fb;
CoglBool quit;
CoglBool redraw_queued;
} Data;
static CoglBool
redraw (Data *data)
{
CoglFramebuffer *fb = data->fb;
cogl_framebuffer_clear4f (fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);
cogl_framebuffer_push_matrix (fb);
cogl_framebuffer_translate (fb, data->center_x, -data->center_y, 0.0f);
cogl_framebuffer_draw_primitive (fb, data->pipeline, data->triangle);
cogl_framebuffer_pop_matrix (fb);
cogl_onscreen_swap_buffers (COGL_ONSCREEN (fb));
return FALSE;
}
static void
handle_event (Data *data, SDL_Event *event)
{
switch (event->type)
{
case SDL_VIDEOEXPOSE:
data->redraw_queued = TRUE;
break;
case SDL_MOUSEMOTION:
{
int width =
cogl_framebuffer_get_width (COGL_FRAMEBUFFER (data->fb));
int height =
cogl_framebuffer_get_height (COGL_FRAMEBUFFER (data->fb));
data->center_x = event->motion.x * 2.0f / width - 1.0f;
data->center_y = event->motion.y * 2.0f / height - 1.0f;
data->redraw_queued = TRUE;
}
break;
case SDL_QUIT:
data->quit = TRUE;
break;
}
}
int
main (int argc, char **argv)
{
CoglContext *ctx;
CoglOnscreen *onscreen;
CoglError *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}
};
Data data;
SDL_Event event;
ctx = cogl_sdl_context_new (SDL_USEREVENT, &error);
if (!ctx)
{
fprintf (stderr, "Failed to create context: %s\n", error->message);
return 1;
}
onscreen = cogl_onscreen_new (ctx, 800, 600);
data.fb = COGL_FRAMEBUFFER (onscreen);
data.center_x = 0.0f;
data.center_y = 0.0f;
data.quit = FALSE;
cogl_onscreen_show (onscreen);
data.triangle = cogl_primitive_new_p2c4 (ctx, COGL_VERTICES_MODE_TRIANGLES,
3, triangle_vertices);
data.pipeline = cogl_pipeline_new (ctx);
data.redraw_queued = TRUE;
while (!data.quit)
{
while (!data.quit)
{
if (!SDL_PollEvent (&event))
{
if (data.redraw_queued)
break;
cogl_sdl_idle (ctx);
if (!SDL_WaitEvent (&event))
{
fprintf (stderr, "Error waiting for SDL events");
return 1;
}
}
handle_event (&data, &event);
cogl_sdl_handle_event (ctx, &event);
}
data.redraw_queued = redraw (&data);
}
cogl_object_unref (ctx);
return 0;
}