// draw callback is where all the main GL rendering happens
static void
_draw_gl(Evas_Object *obj)
{
Evas_GL_API *gl = elm_glview_gl_api_get(obj);
GLData *gld = evas_object_data_get(obj, "gld");
if (!gld) return;
int w, h;
elm_glview_size_get(obj, &w, &h);
gl->glViewport(0, 0, w, h);
gl->glClearColor(red, 0.8, 0.3, 1);
gl->glClear(GL_COLOR_BUFFER_BIT);
// Draw a Triangle
gl->glEnable(GL_BLEND);
gl->glUseProgram(gld->program);
gl->glBindBuffer(GL_ARRAY_BUFFER, gld->vbo);
gl->glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
gl->glEnableVertexAttribArray(0);
gl->glDrawArrays(GL_TRIANGLES, 0, 3);
// Optional - Flush the GL pipeline
gl->glFinish();
red -= 0.1;
if (0.0 > red) red = 1.0;
}
static void
_draw_gl(Evas_Object *obj)
{
Evas_GL_API *gl = elm_glview_gl_api_get(obj);
GLData *gld = evas_object_data_get(obj, "gld");
if (!gld) return;
render_gears(gld);
gl->glFinish();
}
static void
_init_glview(Evas_Object *win, GLData *gld)
{
Evas_Object *bg, *bx, *bt, *gl;
Ecore_Animator *ani;
bg = elm_bg_add(win);
elm_win_resize_object_add(win, bg);
evas_object_size_hint_weight_set(bg, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
evas_object_show(bg);
bx = elm_box_add(win);
evas_object_size_hint_weight_set(bx, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
elm_win_resize_object_add(win, bx);
evas_object_show(bx);
//-//-//-// THIS IS WHERE GL INIT STUFF HAPPENS (ALA EGL)
//-//
// create a new glview object
gl = elm_glview_add(win);
gld->glapi = elm_glview_gl_api_get(gl);
evas_object_size_hint_align_set(gl, EVAS_HINT_FILL, EVAS_HINT_FILL);
evas_object_size_hint_weight_set(gl, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
// mode is simply for supporting alpha, depth buffering, and stencil
// buffering.
elm_glview_mode_set(gl, ELM_GLVIEW_ALPHA | ELM_GLVIEW_DEPTH);
// resize policy tells glview what to do with the surface when it
// resizes. ELM_GLVIEW_RESIZE_POLICY_RECREATE will tell it to
// destroy the current surface and recreate it to the new size
elm_glview_resize_policy_set(gl, ELM_GLVIEW_RESIZE_POLICY_RECREATE);
// render policy tells glview how it would like glview to render
// gl code. ELM_GLVIEW_RENDER_POLICY_ON_DEMAND will have the gl
// calls called in the pixel_get callback, which only gets called
// if the object is visible, hence ON_DEMAND. ALWAYS mode renders
// it despite the visibility of the object.
elm_glview_render_policy_set(gl, ELM_GLVIEW_RENDER_POLICY_ON_DEMAND);
// initialize callback function gets registered here
elm_glview_init_func_set(gl, _init_gl);
// delete callback function gets registered here
elm_glview_del_func_set(gl, _del_gl);
elm_glview_resize_func_set(gl, _resize_gl);
elm_glview_render_func_set(gl, _draw_gl);
//-//
//-//-//-// END GL INIT BLOB
elm_box_pack_end(bx, gl);
evas_object_show(gl);
elm_object_focus_set(gl, EINA_TRUE);
// animating - just a demo. as long as you trigger an update on the image
// object via elm_glview_changed_set() it will be updated.
//
// NOTE: if you delete gl, this animator will keep running trying to access
// gl so you'd better delete this animator with ecore_animator_del().
ani = ecore_animator_add(_anim, gl);
evas_object_data_set(gl, "ani", ani);
evas_object_data_set(gl, "gld", gld);
evas_object_event_callback_add(gl, EVAS_CALLBACK_DEL, _del, gl);
// add an 'OK' button to end the program
bt = elm_button_add(win);
elm_object_text_set(bt, "OK");
evas_object_size_hint_align_set(bt, EVAS_HINT_FILL, EVAS_HINT_FILL);
evas_object_size_hint_weight_set(bt, EVAS_HINT_EXPAND, 0.0);
elm_box_pack_end(bx, bt);
evas_object_show(bt);
evas_object_smart_callback_add(bt, "clicked", _on_done, win);
evas_object_resize(win, 320, 480);
}
EAPI_MAIN int
elm_main(int argc, char **argv)
{
Evas_Object *win, *bg, *bx, *bt, *gl;
Ecore_Animator *ani;
GLData *gld = NULL;
if (!(gld = calloc(1, sizeof(GLData)))) return 1;
// set the engine to opengl_x11
// if commented out, ELM will choose one
elm_config_engine_set("opengl_x11");
win = elm_win_add(NULL, "glview simple", ELM_WIN_BASIC);
elm_win_title_set(win, "GLView Simple");
elm_win_autodel_set(win, EINA_TRUE);
elm_policy_set(ELM_POLICY_QUIT, ELM_POLICY_QUIT_LAST_WINDOW_CLOSED);
bg = elm_bg_add(win);
elm_win_resize_object_add(win, bg);
evas_object_size_hint_weight_set(bg, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
evas_object_show(bg);
bx = elm_box_add(win);
evas_object_size_hint_weight_set(bx, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
elm_win_resize_object_add(win, bx);
evas_object_show(bx);
//-//-//-// THIS IS WHERE GL INIT STUFF HAPPENS (ALA EGL)
//-//
// create a new glview object
gl = elm_glview_add(win);
gld->glapi = elm_glview_gl_api_get(gl);
evas_object_size_hint_align_set(gl, EVAS_HINT_FILL, EVAS_HINT_FILL);
evas_object_size_hint_weight_set(gl, EVAS_HINT_EXPAND, EVAS_HINT_EXPAND);
// mode is simply for supporting alpha, depth buffering, and stencil
// buffering.
elm_glview_mode_set(gl, ELM_GLVIEW_ALPHA | ELM_GLVIEW_DEPTH);
// resize policy tells glview what to do with the surface when it
// resizes. ELM_GLVIEW_RESIZE_POLICY_RECREATE will tell it to
// destroy the current surface and recreate it to the new size
elm_glview_resize_policy_set(gl, ELM_GLVIEW_RESIZE_POLICY_RECREATE);
// render policy tells glview how it would like glview to render
// gl code. ELM_GLVIEW_RENDER_POLICY_ON_DEMAND will have the gl
// calls called in the pixel_get callback, which only gets called
// if the object is visible, hence ON_DEMAND. ALWAYS mode renders
// it despite the visibility of the object.
elm_glview_render_policy_set(gl, ELM_GLVIEW_RENDER_POLICY_ON_DEMAND);
// initialize callback function gets registered here
elm_glview_init_func_set(gl, _init_gl);
// delete callback function gets registered here
elm_glview_del_func_set(gl, _del_gl);
elm_glview_resize_func_set(gl, _resize_gl);
elm_glview_render_func_set(gl, _draw_gl);
//-//
//-//-//-// END GL INIT BLOB
elm_box_pack_end(bx, gl);
evas_object_show(gl);
elm_object_focus_set(gl, EINA_TRUE);
// animating - just a demo. as long as you trigger an update on the image
// object via elm_glview_changed_set() it will be updated.
//
// NOTE: if you delete gl, this animator will keep running trying to access
// gl so you'd better delete this animator with ecore_animator_del().
ani = ecore_animator_add(_anim, gl);
evas_object_data_set(gl, "ani", ani);
evas_object_data_set(gl, "gld", gld);
evas_object_event_callback_add(gl, EVAS_CALLBACK_DEL, _del, gl);
// add an 'OK' button to end the program
bt = elm_button_add(win);
elm_object_text_set(bt, "OK");
evas_object_size_hint_align_set(bt, EVAS_HINT_FILL, EVAS_HINT_FILL);
evas_object_size_hint_weight_set(bt, EVAS_HINT_EXPAND, 0.0);
elm_box_pack_end(bx, bt);
evas_object_show(bt);
evas_object_smart_callback_add(bt, "clicked", _on_done, win);
evas_object_resize(win, 320, 480);
evas_object_show(win);
// run the mainloop and process events and callbacks
elm_run();
elm_shutdown();
return 0;
}
