WebGL: Use sampler object if it's GLES3.

src/glimports.h

@@ -586,12 +586,12 @@ GL_IMPORT_____x(true,  PFNGLBLENDFUNCSEPARATEIPROC,                glBlendFuncSe
 
 GL_IMPORT______(true,  PFNGLDRAWBUFFERPROC,                        glDrawBuffer);
 GL_IMPORT______(true,  PFNGLREADBUFFERPROC,                        glReadBuffer);
-GL_IMPORT_____x(true,  PFNGLGENSAMPLERSPROC,                       glGenSamplers);
-GL_IMPORT_____x(true,  PFNGLDELETESAMPLERSPROC,                    glDeleteSamplers);
-GL_IMPORT_____x(true,  PFNGLBINDSAMPLERPROC,                       glBindSampler);
-GL_IMPORT_____x(true,  PFNGLSAMPLERPARAMETERFPROC,                 glSamplerParameterf);
-GL_IMPORT_____x(true,  PFNGLSAMPLERPARAMETERIPROC,                 glSamplerParameteri);
-GL_IMPORT_____x(true,  PFNGLSAMPLERPARAMETERFVPROC,                glSamplerParameterfv);
+GL_IMPORT______(true,  PFNGLGENSAMPLERSPROC,                       glGenSamplers);
+GL_IMPORT______(true,  PFNGLDELETESAMPLERSPROC,                    glDeleteSamplers);
+GL_IMPORT______(true,  PFNGLBINDSAMPLERPROC,                       glBindSampler);
+GL_IMPORT______(true,  PFNGLSAMPLERPARAMETERFPROC,                 glSamplerParameterf);
+GL_IMPORT______(true,  PFNGLSAMPLERPARAMETERIPROC,                 glSamplerParameteri);
+GL_IMPORT______(true,  PFNGLSAMPLERPARAMETERFVPROC,                glSamplerParameterfv);
 
 GL_IMPORT_____x(true,  PFNGLBINDBUFFERBASEPROC,                    glBindBufferBase);
 GL_IMPORT_____x(true,  PFNGLBINDBUFFERRANGEPROC,                   glBindBufferRange);

src/renderer_gl.cpp

@@ -2921,10 +2921,10 @@ namespace bgfx { namespace gl
 					GL_CHECK(glGenVertexArrays(1, &m_vao) );
 				}
 
-				m_samplerObjectSupport = !BX_ENABLED(BX_PLATFORM_EMSCRIPTEN)
-					&& (m_gles3
-						|| s_extension[Extension::ARB_sampler_objects].m_supported
-						);
+				m_samplerObjectSupport = false
+					|| m_gles3
+					|| s_extension[Extension::ARB_sampler_objects].m_supported
+					;
 
 				m_shadowSamplersSupport = !!(BGFX_CONFIG_RENDERER_OPENGL || m_gles3)
 					|| s_extension[Extension::EXT_shadow_samplers].m_supported