Bug 1247804 - Enable seamless cubemaps where available. - r=jrmuizel

dom/canvas/WebGLContextValidate.cpp

@@ -911,6 +911,10 @@ WebGLContext::InitAndValidateGL()
     }
 #endif
 
+    if (gl->IsSupported(gl::GLFeature::seamless_cube_map_opt_in)) {
+        gl->fEnable(LOCAL_GL_TEXTURE_CUBE_MAP_SEAMLESS);
+    }
+
     // Check the shader validator pref
     mBypassShaderValidation = gfxPrefs::WebGLBypassShaderValidator();
 

gfx/gl/GLContext.cpp

@@ -99,6 +99,7 @@ static const char *sExtensionNames[] = {
     "GL_ARB_pixel_buffer_object",
     "GL_ARB_robustness",
     "GL_ARB_sampler_objects",
+    "GL_ARB_seamless_cube_map",
     "GL_ARB_sync",
     "GL_ARB_texture_compression",
     "GL_ARB_texture_float",

gfx/gl/GLContext.h

@@ -126,6 +126,7 @@ enum class GLFeature {
     sRGB_framebuffer,
     sRGB_texture,
     sampler_objects,
+    seamless_cube_map_opt_in,
     split_framebuffer,
     standard_derivatives,
     sync,
@@ -420,6 +421,7 @@ public:
         ARB_pixel_buffer_object,
         ARB_robustness,
         ARB_sampler_objects,
+        ARB_seamless_cube_map,
         ARB_sync,
         ARB_texture_compression,
         ARB_texture_float,

gfx/gl/GLContextFeatures.cpp

@@ -547,6 +547,15 @@ static const FeatureInfo sFeatureInfoArr[] = {
             GLContext::Extensions_End
         }
     },
+    {
+        "seamless_cube_map_opt_in",
+        GLVersion::GL3_2,
+        GLESVersion::NONE,
+        GLContext::ARB_seamless_cube_map,
+        {
+            GLContext::Extensions_End
+        }
+    },
     {
         // Do we have separate DRAW and READ framebuffer bind points?
         "split_framebuffer",