VK_Indirect: add a large IndirectCount draw before execute secondary

util/test/demos/vk/vk_indirect.cpp

@@ -99,6 +99,17 @@ void main()
     ssbo.data[20] = uvec4(3, 4, 3, 4); // draw verts 3..5
     ssbo.data[21] = uvec4(3, 2, 6, 2); // draw verts 6..8
     ssbo.data[22] = uvec4(3, 5, 9, 5); // draw verts 9..11
+
+    // write count parameters for large indirect count draw
+    uint i = 30;
+    ssbo.data[i++] = uvec4(20*3, 0, 0, 0);
+    // vkCmdDrawIndirectCountKHR()
+    for (uint j = 0; j < 20; ++j)
+    {
+      ssbo.data[i++] = uvec4(3, 4, 3, 4); // draw verts 3..5
+      ssbo.data[i++] = uvec4(3, 2, 6, 2); // draw verts 6..8
+      ssbo.data[i++] = uvec4(3, 5, 9, 5); // draw verts 9..11
+    }
   }
 }
 
@@ -534,6 +545,25 @@ void main()
 
       vkCmdExecuteCommands(primary, 1, &dispatch_secondary);
 
+      // IndirectCount draw in primary buffer which a large count in buffer, before execute secondary
+      if(KHR_draw_indirect_count)
+      {
+        vkCmdBeginRenderPass(
+            primary,
+            vkh::RenderPassBeginInfo(mainWindow->rp, mainWindow->GetFB(), mainWindow->scissor),
+            VK_SUBPASS_CONTENTS_INLINE);
+
+        vkCmdBindPipeline(primary, VK_PIPELINE_BIND_POINT_GRAPHICS, drawpipe);
+        vkCmdSetViewport(primary, 0, 1, &mainWindow->viewport);
+        vkCmdSetScissor(primary, 0, 1, &mainWindow->scissor);
+        vkh::cmdBindVertexBuffers(primary, 0, {vb.buffer}, {0});
+        vkCmdBindIndexBuffer(primary, ib.buffer, 0, VK_INDEX_TYPE_UINT32);
+
+        vkCmdDrawIndirectCountKHR(primary, ssbo.buffer, 31 * sizeof(uvec4), ssbo.buffer,
+                                  30 * sizeof(uvec4) + 0 * sizeof(uint32_t), 128, sizeof(uvec4));
+        vkCmdEndRenderPass(primary);
+      }
+
       vkCmdBeginRenderPass(
           primary, vkh::RenderPassBeginInfo(mainWindow->rp, mainWindow->GetFB(), mainWindow->scissor),
           VK_SUBPASS_CONTENTS_SECONDARY_COMMAND_BUFFERS);