ShaderGen: Fix ImGui rendering with Vulkan

src/util/shadergen.cpp

@@ -970,6 +970,7 @@ std::string ShaderGen::GenerateImGuiFragmentShader() const
 {
   std::stringstream ss;
   WriteHeader(ss);
+  DeclareUniformBuffer(ss, {"float4x4 ProjectionMatrix"}, false); // needs the descriptor set defined
   DeclareTexture(ss, "samp0", 0);
   DeclareFragmentEntryPoint(ss, 1, 1);
 

src/util/vulkan_device.cpp

@@ -2866,8 +2866,9 @@ void VulkanDevice::PushUniformBuffer(bool is_compute, const void* data, u32 data
   DebugAssert(data_size < UNIFORM_PUSH_CONSTANTS_SIZE);
   s_stats.buffer_streamed += data_size;
   vkCmdPushConstants(m_current_command_buffer, GetCurrentVkPipelineLayout(is_compute),
-                     is_compute ? VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT : UNIFORM_PUSH_CONSTANTS_STAGES, 0, data_size,
-                     data);
+                     is_compute ? VK_PIPELINE_STAGE_COMPUTE_SHADER_BIT :
+                                  static_cast<VkPipelineStageFlags>(UNIFORM_PUSH_CONSTANTS_STAGES),
+                     0, data_size, data);
 }
 
 void* VulkanDevice::MapUniformBuffer(u32 size)