2 * @defgroup GLView GLView
5 * @image html glview_inheritance_tree.png
6 * @image latex glview_inheritance_tree.eps
8 * A GLView widget allows for simple GL rendering in elementary environment.
9 * GLView hides all the complicated evas_gl details so that the user only
10 * has to deal with registering a few callback functions for rendering
11 * to a surface using OpenGL APIs.
13 * This widget emits the following signals, besides the ones sent from
15 * - @c "language,changed" - the program's language changed
17 * Below is an illustrative example of how to use GLView and and OpenGL
18 * to render in elementary environment.
19 * @ref glview_example_01_page
23 typedef void (*Elm_GLView_Func_Cb)(Evas_Object *obj);
25 typedef enum _Elm_GLView_Mode
28 ELM_GLVIEW_ALPHA = (1<<1), /**< Alpha channel enabled rendering mode */
29 ELM_GLVIEW_DEPTH = (1<<2), /**< Depth buffer enabled rendering mode */
30 ELM_GLVIEW_STENCIL = (1<<3), /**< Stencil buffer enabled rendering mode */
31 ELM_GLVIEW_DIRECT = (1<<4) /**< Direct rendering optimization hint */
35 * Defines a policy for the glview resizing.
37 * The resizing policy tells glview what to do with the underlying
38 * surface when resize happens. ELM_GLVIEW_RESIZE_POLICY_RECREATE
39 * will destroy the current surface and recreate the surface to the
40 * new size. ELM_GLVIEW_RESIZE_POLICY_SCALE will instead keep the
41 * current surface but only display the result at the desired size
44 * @note Default is ELM_GLVIEW_RESIZE_POLICY_RECREATE
48 ELM_GLVIEW_RESIZE_POLICY_RECREATE = 1, /**< Resize the internal surface along with the image */
49 ELM_GLVIEW_RESIZE_POLICY_SCALE = 2 /**< Only resize the internal image and not the surface */
50 } Elm_GLView_Resize_Policy;
53 * Defines a policy for gl rendering.
55 * The rendering policy tells glview where to run the gl rendering code.
56 * ELM_GLVIEW_RENDER_POLICY_ON_DEMAND tells glview to call the rendering
57 * calls on demand, which means that the rendering code gets called
58 * only when it is visible.
60 * @note Default is ELM_GLVIEW_RENDER_POLICY_ON_DEMAND
64 ELM_GLVIEW_RENDER_POLICY_ON_DEMAND = 1, /**< Render only when there is a need for redrawing */
65 ELM_GLVIEW_RENDER_POLICY_ALWAYS = 2 /**< Render always even when it is not visible */
66 } Elm_GLView_Render_Policy;
69 * Add a new glview to the parent
71 * @param parent The parent object
72 * @return The new object or NULL if it cannot be created
76 EAPI Evas_Object *elm_glview_add(Evas_Object *parent);
79 * Sets the size of the glview
81 * @param obj The glview object
82 * @param w width of the glview object
83 * @param h height of the glview object
87 EAPI void elm_glview_size_set(Evas_Object *obj, Evas_Coord w, Evas_Coord h);
90 * Gets the size of the glview.
92 * @param obj The glview object
93 * @param w width of the glview object
94 * @param h height of the glview object
96 * Note that this function returns the actual image size of the
97 * glview. This means that when the scale policy is set to
98 * ELM_GLVIEW_RESIZE_POLICY_SCALE, it'll return the non-scaled
103 EAPI void elm_glview_size_get(const Evas_Object *obj, Evas_Coord *w, Evas_Coord *h);
106 * Gets the gl api struct for gl rendering
108 * @param obj The glview object
109 * @return The api object or NULL if it cannot be created
113 EAPI Evas_GL_API *elm_glview_gl_api_get(const Evas_Object *obj);
116 * Set the mode of the GLView. Supports alpha, depth, stencil.
118 * @param obj The glview object
119 * @param mode The mode Options OR'ed enabling Alpha, Depth, Stencil, Direct.
120 * @return True if set properly.
122 * Direct is a hint for the elm_glview to render directly to the window
123 * given that the right conditions are met. Otherwise it falls back
124 * to rendering to an offscreen buffer before it gets composited to the
129 EAPI Eina_Bool elm_glview_mode_set(Evas_Object *obj, Elm_GLView_Mode mode);
132 * Set the resize policy for the glview object.
134 * @param obj The glview object.
135 * @param policy The scaling policy.
137 * By default, the resize policy is set to ELM_GLVIEW_RESIZE_POLICY_RECREATE.
138 * When resize is called it destroys the previous surface and recreates the
139 * newly specified size. If the policy is set to
140 * ELM_GLVIEW_RESIZE_POLICY_SCALE, however, glview only scales the image
141 * object and not the underlying GL Surface.
145 EAPI Eina_Bool elm_glview_resize_policy_set(Evas_Object *obj, Elm_GLView_Resize_Policy policy);
148 * Set the render policy for the glview object.
150 * @param obj The glview object.
151 * @param policy The render policy.
153 * By default, the render policy is set to ELM_GLVIEW_RENDER_POLICY_ON_DEMAND.
154 * This policy is set such that during the render loop, glview is only
155 * redrawn if it needs to be redrawn. (i.e. when it is visible) If the policy
156 * is set to ELM_GLVIEWW_RENDER_POLICY_ALWAYS, it redraws regardless of
157 * whether it is visible or needs redrawing.
161 EAPI Eina_Bool elm_glview_render_policy_set(Evas_Object *obj, Elm_GLView_Render_Policy policy);
164 * Set the init function that runs once in the main loop.
166 * @param obj The glview object.
167 * @param func The init function to be registered.
169 * The registered init function gets called once during the render loop.
170 * This function allows glview to hide all the rendering context/surface
171 * details and have the user just call GL calls that they desire
172 * for initialization GL calls.
176 EAPI void elm_glview_init_func_set(Evas_Object *obj, Elm_GLView_Func_Cb func);
179 * Set the render function that runs in the main loop.
181 * @param obj The glview object.
182 * @param func The delete function to be registered.
184 * The registered del function gets called when GLView object is deleted.
185 * This function allows glview to hide all the rendering context/surface
186 * details and have the user just call GL calls that they desire
187 * when delete happens.
191 EAPI void elm_glview_del_func_set(Evas_Object *obj, Elm_GLView_Func_Cb func);
194 * Set the resize function that gets called when resize happens.
196 * @param obj The glview object.
197 * @param func The resize function to be registered.
199 * The resize function gets called during the render loop.
200 * This function allows glview to hide all the rendering context/surface
201 * details and have the user just call GL calls that they desire
202 * when resize happens.
206 EAPI void elm_glview_resize_func_set(Evas_Object *obj, Elm_GLView_Func_Cb func);
209 * Set the render function that runs in the main loop.
211 * The render function gets called in the main loop but whether it runs
212 * depends on the rendering policy and whether elm_glview_changed_set()
215 * @param obj The glview object.
216 * @param func The render function to be registered.
220 EAPI void elm_glview_render_func_set(Evas_Object *obj, Elm_GLView_Func_Cb func);
223 * Notifies that there has been changes in the GLView.
225 * @param obj The glview object.
229 EAPI void elm_glview_changed_set(Evas_Object *obj);