Add support for GL_OES_EGL_image_external_essl3

Test/100samplerExternal.frag

@@ -0,0 +1,41 @@
+#version 100
+
+#extension GL_OES_EGL_image_external : enable
+
+uniform samplerExternalOES sExt;
+precision mediump samplerExternalOES;
+uniform samplerExternalOES mediumExt;
+uniform highp samplerExternalOES highExt;
+
+void main()
+{
+    texture2D(sExt, vec2(0.2));
+    texture2D(mediumExt, vec2(0.2));
+    texture2D(highExt, vec2(0.2));
+    texture2DProj(sExt, vec3(0.3));
+    texture2DProj(sExt, vec4(0.3));
+
+    int lod = 0;
+    highp float bias = 0.01;
+    textureSize(sExt, lod);  // ERROR
+    texture(sExt, vec2(0.2));  // ERROR
+    texture(sExt, vec2(0.2), bias);  // ERROR
+    textureProj(sExt, vec3(0.2));  // ERROR
+    textureProj(sExt, vec3(0.2), bias);  // ERROR
+    textureProj(sExt, vec4(0.2));  // ERROR
+    textureProj(sExt, vec4(0.2), bias);  // ERROR
+    texelFetch(sExt, ivec2(4), lod);  // ERROR
+
+    texture3D(sExt, vec3(0.3));  // ERROR
+    texture2DProjLod(sExt, vec3(0.3), 0.3);  // ERROR
+    texture(sExt, vec3(0.3));  // ERROR
+    textureProjLod(sExt, vec3(0.3), 0.3);  // ERROR
+}
+
+#extension GL_OES_EGL_image_external : disable
+
+#extension GL_OES_EGL_image_external_essl3 : enable
+uniform samplerExternalOES badExt;  // ERROR
+#extension GL_OES_EGL_image_external_essl3 : disable
+
+uniform samplerExternalOES badExt;  // ERROR