Added new Evas GL api called evas_gl_config_new/free()

to ensure backward compatibility.  Previously, the user
simply declared a Evas_GL_Config object but this can
cause problems if more config options are added.  So,
we have Evas allocate the config object for the user
so it can handle addition in the future.

Also, added some safety code around _extensions_init


SVN revision: 67141

legacy/evas/ChangeLog

@@ -622,4 +622,15 @@
 
         * Add EvasGL support to software backend using OSMesa.  Requires OSMesa
           library.  Due to caveats in OSMesa, surface config stays with a 
-          context
+          context rather than with a surface.  So for now, the config of a 
+          surface remains with the first context that it binds to.  May need
+          to come up with a different solution in the near future.
+
+2012-01-12  Sung W. Park (sung_)
+
+	* Add new api evas_gl_config_new/free() to ensure backward compatibility.
+          Previously, the user simply declared a Evas_GL_Config object but this
+          can cause issues if new configs are added. Now we have evas allocate it
+          for you.
+
+

legacy/evas/src/lib/Evas_GL.h

@@ -28,7 +28,7 @@ typedef enum _Evas_GL_Depth_Bits
     EVAS_GL_DEPTH_BIT_8  = 1,
     EVAS_GL_DEPTH_BIT_16 = 2,
     EVAS_GL_DEPTH_BIT_24 = 3,
-    EVAS_GL_DEPTH_BIT_32 = 4,
+    EVAS_GL_DEPTH_BIT_32 = 4
 } Evas_GL_Depth_Bits;
 
 typedef enum _Evas_GL_Stencil_Bits
@@ -38,14 +38,21 @@ typedef enum _Evas_GL_Stencil_Bits
     EVAS_GL_STENCIL_BIT_2  = 2,
     EVAS_GL_STENCIL_BIT_4  = 3,
     EVAS_GL_STENCIL_BIT_8  = 4,
-    EVAS_GL_STENCIL_BIT_16 = 5,
+    EVAS_GL_STENCIL_BIT_16 = 5
 } Evas_GL_Stencil_Bits;
 
+typedef enum _Evas_GL_Options_Bits
+{
+   EVAS_GL_OPTIONS_NONE    = 0,
+   EVAS_GL_OPTIONS_DIRECT  = (1<<0)
+} Evas_GL_Options_Bits;
+
 struct _Evas_GL_Config
 {
-    Evas_GL_Color_Format     color_format;
-    Evas_GL_Depth_Bits       depth_bits;
-    Evas_GL_Stencil_Bits     stencil_bits;
+   Evas_GL_Color_Format     color_format;
+   Evas_GL_Depth_Bits       depth_bits;
+   Evas_GL_Stencil_Bits     stencil_bits;
+   Evas_GL_Options_Bits     options_bits;
 };
 
 #define EVAS_GL_EXTENSIONS       1
@@ -73,6 +80,7 @@ typedef struct _GLData
 {
    Evas_GL_Context *ctx;
    Evas_GL_Surface *sfc;
+   Evas_GL_Config  *cfg;
    Evas_GL         *evasgl;
    Evas_GL_API     *glapi;
    GLuint           program;
@@ -93,13 +101,6 @@ static GLuint    load_shader  (GLData *gld, GLenum type, const char *shader_src)
 int
 main(int argc, char **argv)
 {
-   // config for the surface for evas_gl
-   Evas_GL_Config config =
-     {
-        EVAS_GL_RGBA_8888,
-        EVAS_GL_DEPTH_NONE,
-        EVAS_GL_STENCIL_NONE
-     };
    // a size by default
    int w = 256, h = 256;
    // some variables we will use
@@ -124,8 +125,16 @@ main(int argc, char **argv)
    // get the evas gl handle for doing gl things
    gld->evasgl = evas_gl_new(canvas);
    gld->glapi = evas_gl_api_get(gld->evasgl);
+
+   // Set a surface config
+   gld->cfg = evas_gl_config_new();
+   gld->cfg->color_format = EVAS_GL_RGBA_8888;
+   //gld->cfg->depth_bits   = EVAS_GL_DEPTH_NONE;        // Othe config options
+   //gld->cfg->stencil_bits = EVAS_GL_STENCIL_NONE;
+   //gld->cfg->options_bits = EVAS_GL_OPTIONS_NONE;
+
    // create a surface and context
-   gld->sfc = evas_gl_surface_create(gld->evasgl, &config, w, h);
+   gld->sfc = evas_gl_surface_create(gld->evasgl, gld->cfg, w, h);
    gld->ctx = evas_gl_context_create(gld->evasgl, NULL);
    //-//
    //-//-//-// END GL INIT BLOB
@@ -207,6 +216,7 @@ on_del(void *data, Evas *e, Evas_Object *obj, void *event_info)
 
    evas_gl_surface_destroy(gld->evasgl, gld->sfc);
    evas_gl_context_destroy(gld->evasgl, gld->ctx);
+   evas_gl_config_free(gld->cfg);
    evas_gl_free(gld->evasgl);
    free(gld);
 }
@@ -388,6 +398,22 @@ EAPI Evas_GL                 *evas_gl_new                (Evas *e) EINA_WARN_UNU
  */
 EAPI void                     evas_gl_free               (Evas_GL *evas_gl) EINA_ARG_NONNULL(1);
 
+/**
+ * Allocates a new config object for the user to fill out.
+ *
+ * As long as the Evas creates a config object for the user, it takes care
+ * of the backward compatibility issue.
+ */
+EAPI Evas_GL_Config          *evas_gl_config_new         ();
+
+/**
+ * Frees a config object created from evas_gl_config_new.
+ *
+ * As long as the Evas creates a config object for the user, it takes care
+ * of the backward compatibility issue.
+ */
+EAPI void                     evas_gl_config_free        (Evas_GL_Config *cfg) EINA_ARG_NONNULL(1);
+
 /**
  * Creates and returns new Evas_GL_Surface object for GL Rendering.
  *

legacy/evas/src/lib/canvas/evas_gl.c

@@ -37,6 +37,13 @@ evas_gl_new(Evas *e)
    evas_gl->magic = MAGIC_EVAS_GL;
    evas_gl->evas = e;
 
+   if (!evas_gl->evas->engine.func->gl_context_create)
+     {
+        ERR("GL engine not available\n");
+        free(evas_gl);
+        return NULL;
+     }
+
    return evas_gl;
 }
 
@@ -60,6 +67,24 @@ evas_gl_free(Evas_GL *evas_gl)
    free(evas_gl);
 }
 
+EAPI Evas_GL_Config *
+evas_gl_config_new()
+{
+   Evas_GL_Config *cfg;
+
+   cfg = calloc(1, sizeof(Evas_GL_Config));
+
+   if (!cfg) return NULL;
+
+   return cfg;
+}
+
+EAPI void
+evas_gl_config_free(Evas_GL_Config *cfg)
+{
+   if (cfg) free(cfg);
+}
+
 EAPI Evas_GL_Surface *
 evas_gl_surface_create(Evas_GL *evas_gl, Evas_GL_Config *config, int width, int height)
 {
@@ -77,6 +102,8 @@ evas_gl_surface_create(Evas_GL *evas_gl, Evas_GL_Config *config, int width, int
 
    surf = calloc(1, sizeof(Evas_GL_Surface));
 
+   if (!surf) return NULL;
+
    surf->data = evas_gl->evas->engine.func->gl_surface_create(evas_gl->evas->engine.data.output, config, width, height);
 
    if (!surf->data)
@@ -135,12 +162,6 @@ evas_gl_context_create(Evas_GL *evas_gl, Evas_GL_Context *share_ctx)
         return NULL;
      }
 
-   if (!evas_gl->evas->engine.func->gl_context_create)
-     {
-        ERR("GL engine not available\n");
-        return NULL;
-     }
-
    // Call engine->gl_create_context
    if (share_ctx)
      {

legacy/evas/src/modules/engines/gl_x11/evas_engine.c

@@ -584,25 +584,30 @@ _extensions_init(Render_Engine *re)
 
 #if defined (GLES_VARIETY_S3C6410) || defined (GLES_VARIETY_SGX)
    // EGL Extensions
-   evasglexts = glsym_eglQueryString(re->win->egl_disp, EGL_EXTENSIONS);
+   if (glsym_eglQueryString)
+     {
+        evasglexts = glsym_eglQueryString(re->win->egl_disp, EGL_EXTENSIONS);
 #else
-   evasglexts = glXQueryExtensionsString(re->info->info.display, 
-                                         re->info->info.screen);
+   if (glsym_glXQueryExtensionsString)
+     {
+        evasglexts = glXQueryExtensionsString(re->info->info.display, 
+                                              re->info->info.screen);
 #endif
 
-   DBG("--------EvasGL Extensions----------");
-   for (i = 0; _evasgl_ext_entries[i].name != NULL; i++)
-     {
-        if ( (strstr(evasglexts, _evasgl_ext_entries[i].name) != NULL) ||
-             (strstr(evasglexts, _evasgl_ext_entries[i].real_name) != NULL) )
+        DBG("--------EvasGL Extensions----------");
+        for (i = 0; _evasgl_ext_entries[i].name != NULL; i++)
           {
-             _evasgl_ext_entries[i].supported = 1;
-             strcat(_evasgl_ext_string, _evasgl_ext_entries[i].name);
-             strcat(_evasgl_ext_string, " ");
-             DBG("\t%s", _evasgl_ext_entries[i].name);
+             if ( (strstr(evasglexts, _evasgl_ext_entries[i].name) != NULL) ||
+                  (strstr(evasglexts, _evasgl_ext_entries[i].real_name) != NULL) )
+               {
+                  _evasgl_ext_entries[i].supported = 1;
+                  strcat(_evasgl_ext_string, _evasgl_ext_entries[i].name);
+                  strcat(_evasgl_ext_string, " ");
+                  DBG("\t%s", _evasgl_ext_entries[i].name);
+               }
           }
+        DBG(" ");
      }
-   DBG(" ");
 }
 
 int _evas_engine_GL_X11_log_dom = -1;