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8304ad8992
This adds a simple example based on the hello example but that forces the SDL winsys and listens for mouse motion events to move the triangle. Reviewed-by: Robert Bragg <robert@linux.intel.com>
119 lines
2.8 KiB
C
119 lines
2.8 KiB
C
#include <cogl/cogl.h>
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#include <glib.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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CoglColor black;
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CoglPrimitive *triangle;
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float center_x, center_y;
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CoglFramebuffer *fb;
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} Data;
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static void
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redraw (Data *data)
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{
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cogl_clear (&data->black, COGL_BUFFER_BIT_COLOR);
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cogl_push_matrix ();
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cogl_translate (data->center_x, -data->center_y, 0.0f);
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cogl_primitive_draw (data->triangle);
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cogl_pop_matrix ();
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cogl_framebuffer_swap_buffers (data->fb);
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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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CoglRenderer *renderer;
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CoglDisplay *display;
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CoglContext *ctx;
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CoglOnscreen *onscreen;
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GError *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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/* Force the SDL winsys */
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renderer = cogl_renderer_new ();
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cogl_renderer_set_winsys_id (renderer, COGL_WINSYS_ID_SDL);
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display = cogl_display_new (renderer, NULL);
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ctx = cogl_context_new (display, &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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/* Eventually there will be an implicit allocate on first use so this
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* will become optional... */
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data.fb = COGL_FRAMEBUFFER (onscreen);
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if (!cogl_framebuffer_allocate (data.fb, &error))
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{
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fprintf (stderr, "Failed to allocate framebuffer: %s\n",
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error->message);
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return 1;
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}
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cogl_color_set_from_4ub (&data.black, 0, 0, 0, 255);
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data.center_x = 0.0f;
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data.center_y = 0.0f;
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cogl_onscreen_show (onscreen);
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cogl_push_framebuffer (data.fb);
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data.triangle = cogl_primitive_new_p2c4 (COGL_VERTICES_MODE_TRIANGLES,
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3, triangle_vertices);
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while (SDL_WaitEvent (&event))
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{
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switch (event.type)
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{
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case SDL_VIDEOEXPOSE:
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redraw (&data);
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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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redraw (&data);
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}
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break;
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case SDL_QUIT:
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goto done;
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}
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}
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fprintf (stderr, "Error waiting for an event: %s\n",
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SDL_GetError ());
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done:
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cogl_pop_framebuffer ();
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cogl_object_unref (ctx);
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cogl_object_unref (display);
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cogl_object_unref (renderer);
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return 0;
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}
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