Bug 763559 - Enable WEBGL_compressed_texture_s3tc with ANGLE - r=jgilbert

content/canvas/src/WebGLContext.cpp

@@ -861,7 +861,13 @@ bool WebGLContext::IsExtensionSupported(WebGLExtensionID ei)
             isSupported = true;
             break;
         case WebGL_WEBGL_compressed_texture_s3tc:
-            isSupported = gl->IsExtensionSupported(GLContext::EXT_texture_compression_s3tc);
+            if (gl->IsExtensionSupported(GLContext::EXT_texture_compression_s3tc)) {
+                isSupported = true;
+            } else {
+                isSupported = gl->IsExtensionSupported(GLContext::EXT_texture_compression_dxt1) &&
+                              gl->IsExtensionSupported(GLContext::ANGLE_texture_compression_dxt3) &&
+                              gl->IsExtensionSupported(GLContext::ANGLE_texture_compression_dxt5);
+            }
             break;
         default:
             isSupported = false;

gfx/gl/GLContext.cpp

@@ -66,6 +66,9 @@ static const char *sExtensionNames[] = {
     "GL_OES_standard_derivatives",
     "GL_EXT_texture_filter_anisotropic",
     "GL_EXT_texture_compression_s3tc",
+    "GL_EXT_texture_compression_dxt1",
+    "GL_ANGLE_texture_compression_dxt3",
+    "GL_ANGLE_texture_compression_dxt5",
     "GL_EXT_framebuffer_blit",
     "GL_ANGLE_framebuffer_blit",
     "GL_EXT_framebuffer_multisample",

gfx/gl/GLContext.h

@@ -1496,6 +1496,9 @@ public:
         OES_standard_derivatives,
         EXT_texture_filter_anisotropic,
         EXT_texture_compression_s3tc,
+        EXT_texture_compression_dxt1,
+        ANGLE_texture_compression_dxt3,
+        ANGLE_texture_compression_dxt5,
         EXT_framebuffer_blit,
         ANGLE_framebuffer_blit,
         EXT_framebuffer_multisample,