9f107ab3fb
The SDL2 winsys will now set the SDL_WINDOW_RESIZABLE flag on the window before creating it if the resizable property is set on the onscreen. Note that there doesn't appear to be a way in SDL to change the flag later so unlike the other winsyses it will only take affect if it is set before allocating the framebuffer. The winsys now registers a callback for SDL events so that it can report window size changes back to the application. Reviewed-by: Robert Bragg <robert@linux.intel.com> (cherry picked from commit 0dea9aeb897faf029828379b120970477df3c7d5)
141 lines
3.2 KiB
C
141 lines
3.2 KiB
C
#include <cogl/cogl.h>
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#include <stdio.h>
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#include <SDL.h>
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/* This short example is just to demonstrate mixing SDL with Cogl as a
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simple way to get portable support for events */
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typedef struct Data
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{
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CoglPrimitive *triangle;
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CoglPipeline *pipeline;
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float center_x, center_y;
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CoglFramebuffer *fb;
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CoglBool quit;
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CoglBool redraw_queued;
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} Data;
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static CoglBool
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redraw (Data *data)
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{
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CoglFramebuffer *fb = data->fb;
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cogl_framebuffer_clear4f (fb, COGL_BUFFER_BIT_COLOR, 0, 0, 0, 1);
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cogl_framebuffer_push_matrix (fb);
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cogl_framebuffer_translate (fb, data->center_x, -data->center_y, 0.0f);
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cogl_framebuffer_draw_primitive (fb, data->pipeline, data->triangle);
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cogl_framebuffer_pop_matrix (fb);
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cogl_onscreen_swap_buffers (COGL_ONSCREEN (fb));
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return FALSE;
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}
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static void
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handle_event (Data *data, SDL_Event *event)
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{
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switch (event->type)
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{
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case SDL_WINDOWEVENT:
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switch (event->window.event)
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{
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case SDL_WINDOWEVENT_EXPOSED:
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data->redraw_queued = TRUE;
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break;
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case SDL_WINDOWEVENT_CLOSE:
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data->quit = TRUE;
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break;
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}
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break;
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case SDL_MOUSEMOTION:
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{
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int width =
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cogl_framebuffer_get_width (COGL_FRAMEBUFFER (data->fb));
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int height =
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cogl_framebuffer_get_height (COGL_FRAMEBUFFER (data->fb));
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data->center_x = event->motion.x * 2.0f / width - 1.0f;
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data->center_y = event->motion.y * 2.0f / height - 1.0f;
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data->redraw_queued = TRUE;
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}
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break;
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case SDL_QUIT:
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data->quit = TRUE;
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break;
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}
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}
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int
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main (int argc, char **argv)
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{
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CoglContext *ctx;
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CoglOnscreen *onscreen;
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CoglError *error = NULL;
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CoglVertexP2C4 triangle_vertices[] = {
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{0, 0.7, 0xff, 0x00, 0x00, 0x80},
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{-0.7, -0.7, 0x00, 0xff, 0x00, 0xff},
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{0.7, -0.7, 0x00, 0x00, 0xff, 0xff}
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};
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Data data;
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SDL_Event event;
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ctx = cogl_sdl_context_new (SDL_USEREVENT, &error);
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if (!ctx)
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{
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fprintf (stderr, "Failed to create context: %s\n", error->message);
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return 1;
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}
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onscreen = cogl_onscreen_new (ctx, 800, 600);
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data.fb = COGL_FRAMEBUFFER (onscreen);
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data.center_x = 0.0f;
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data.center_y = 0.0f;
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data.quit = FALSE;
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/* In SDL2, setting resizable only works before allocating the
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* onscreen */
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cogl_onscreen_set_resizable (onscreen, TRUE);
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cogl_onscreen_show (onscreen);
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data.triangle = cogl_primitive_new_p2c4 (ctx, COGL_VERTICES_MODE_TRIANGLES,
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3, triangle_vertices);
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data.pipeline = cogl_pipeline_new (ctx);
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data.redraw_queued = TRUE;
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while (!data.quit)
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{
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while (!data.quit)
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{
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if (!SDL_PollEvent (&event))
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{
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if (data.redraw_queued)
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break;
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cogl_sdl_idle (ctx);
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if (!SDL_WaitEvent (&event))
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{
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fprintf (stderr, "Error waiting for SDL events");
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return 1;
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}
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}
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handle_event (&data, &event);
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cogl_sdl_handle_event (ctx, &event);
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}
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data.redraw_queued = redraw (&data);
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}
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cogl_object_unref (ctx);
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return 0;
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}
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