0e7a632e13
This enables basic Emscripten support in Cogl via the SDL winsys. Assuming you have setup an emscripten toolchain you can configure Cogl like this: emconfigure ./configure --enable-debug --enable-emscripten Building the examples will build .html files that can be loaded directly by a WebGL enabled browser. Note: at this point the emscripten support has just barely been smoke tested so it's expected that as we continue to build on this we will learn about more things we need to change in Cogl to full support this environment. Reviewed-by: Neil Roberts <neil@linux.intel.com> (cherry picked from commit a3bc2e7539391b074e697839dfae60b69c37cf10)
136 lines
3.0 KiB
C
136 lines
3.0 KiB
C
#include <cogl/cogl.h>
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#include <stdio.h>
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#include <SDL.h>
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#include <emscripten.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 redraw_queued;
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CoglBool ready_to_draw;
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} Data;
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static Data data;
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static CoglContext *ctx;
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static void
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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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}
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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_VIDEOEXPOSE:
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data->redraw_queued = TRUE;
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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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}
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}
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static void
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frame_cb (CoglOnscreen *onscreen,
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CoglFrameEvent event,
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CoglFrameInfo *info,
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void *user_data)
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{
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Data *data = user_data;
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if (event == COGL_FRAME_EVENT_SYNC)
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data->ready_to_draw = TRUE;
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}
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static void
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mainloop (void)
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{
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SDL_Event event;
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while (SDL_PollEvent (&event))
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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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redraw (&data);
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data.redraw_queued = FALSE;
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data.ready_to_draw = FALSE;
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cogl_sdl_idle (ctx);
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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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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, 0xff},
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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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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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cogl_onscreen_add_frame_callback (onscreen,
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frame_cb,
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&data,
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NULL /* destroy callback */);
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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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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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data.ready_to_draw = TRUE;
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emscripten_set_main_loop (mainloop, -1, TRUE);
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cogl_object_unref (ctx);
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return 0;
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}
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