Fix T88766 EEVEE: Missing glossy reflections with Shader to RGB & SSR is active.

This was due to the shading evaluation being outdated inside the ShaderToRGBA
glsl code.

source/blender/gpu/shaders/material/gpu_shader_material_shader_to_rgba.glsl

@@ -1,14 +1,22 @@
 #ifndef VOLUMETRICS
+
+CLOSURE_EVAL_FUNCTION_DECLARE_1(node_shader_to_rgba, Glossy)
+
 void node_shader_to_rgba(Closure cl, out vec4 outcol, out float outalpha)
 {
   vec4 spec_accum = vec4(0.0);
   if (ssrToggle && FLAG_TEST(cl.flag, CLOSURE_SSR_FLAG)) {
-    vec3 V = cameraVec(worldPosition);
+    CLOSURE_VARS_DECLARE_1(Glossy);
+
     vec3 vN = normal_decode(cl.ssr_normal, viewCameraVec(viewPosition));
     vec3 N = transform_direction(ViewMatrixInverse, vN);
-    float roughness = cl.ssr_data.a;
-    float roughnessSquared = max(1e-3, roughness * roughness);
-    fallback_cubemap(N, V, worldPosition, viewPosition, roughness, roughnessSquared, spec_accum);
+
+    in_Glossy_0.N = N; /* Normalized during eval. */
+    in_Glossy_0.roughness = cl.ssr_data.a;
+
+    CLOSURE_EVAL_FUNCTION_1(node_shader_to_rgba, Glossy);
+
+    spec_accum.rgb = out_Glossy_0.radiance;
   }
 
   outalpha = saturate(1.0 - avg(cl.transmittance));