Web: Add SSBOs and a few other missing compute features.

Test/web.comp

@@ -5,6 +5,7 @@ layout(local_size_x_id = 18, local_size_z_id = 19) in;
 layout(local_size_x = 2) in;
 layout(local_size_y = 5) in;
 layout(local_size_z = 7) in;
+
 const int total = gl_MaxComputeWorkGroupCount.x
                 + gl_MaxComputeWorkGroupCount.y
                 + gl_MaxComputeWorkGroupCount.z
@@ -17,12 +18,24 @@ int arrX[gl_WorkGroupSize.x];
 int arrY[gl_WorkGroupSize.y];
 int arrZ[gl_WorkGroupSize.z];
 
+layout(binding = 0, set = 0) buffer bName {
+    int size;
+    uvec3 count;
+    vec4 data[];
+} bInst;
+
 void main()
 {
     barrier();
+
+    bInst.data[bInst.size / 2] *= vec4(7.0);
+
     memoryBarrier();
-    memoryBarrierShared();
     groupMemoryBarrier();
-    s[3] = vec4(1.0);
-    s[3] *= arrX[0] * arrY[0] * arrZ[0];
+    memoryBarrierShared();
+    memoryBarrierBuffer();
+
+    s[3] = vec4(0, arrX[0], arrY[0], arrZ[0]);
+    bInst.count = gl_NumWorkGroups + gl_WorkGroupSize + gl_WorkGroupID + gl_LocalInvocationID +
+                  gl_GlobalInvocationID * gl_LocalInvocationIndex;
 }