evas gl: Partially fix MSAA for GLES 3 drivers

MSAA (multisampled_render_to_texture) support was implemented with
GLES 2 in mind, but for GLES 3 it comes as a core feature, not as
an extension. Also it relies on renderbuffers, not textures. GL
is awesome.

Note: MSAA still doesn't work!

Change-Id: I51d1588d2bdae49af31802735c0bd29fcb7acc1f

diff --git a/src/modules/evas/engines/gl_common/evas_gl_core.c b/src/modules/evas/engines/gl_common/evas_gl_core.c
index 811688a..6745847 100644 (file)
--- a/src/modules/evas/engines/gl_common/evas_gl_core.c
+++ b/src/modules/evas/engines/gl_common/evas_gl_core.c
@@ -1542,7 +1542,8 @@ try_again:
 
    if (cfg_index < 0)
      {
-        ERR("Unable to find a matching config format.");
+        ERR("Unable to find a matching config format (depth:%d, stencil:%d, msaa:%d)",
+            depth_size, stencil_bit, msaa_samples);
         if ((stencil_bit > 8) || (depth_size > 24))
           {
              INF("Please note that Evas GL might not support 32-bit depth or "
@@ -1557,6 +1558,13 @@ try_again:
              DBG("Fallback to depth:%d, stencil:%d", depth_size, stencil_bit);
              goto try_again;
           }
+        else if (msaa_samples > 0)
+          {
+             msaa_samples /= 2;
+             if (msaa_samples == 1) msaa_samples = 0;
+             DBG("Fallback to msaa:%d", msaa_samples);
+             goto try_again;
+          }
         return 0;
      }
    else