vk_rasterizer: Add lazy default buffer maker and use it for empty buffers
Introduce a default buffer getter that lazily constructs an empty buffer. This is intended to match OpenGL's buffer 0. Use this for disabled vertex and uniform buffers. While we are at it, include vertex buffer usages for staging buffers to silence validation errors.
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@ -836,6 +836,10 @@ void RasterizerVulkan::SetupVertexArrays(FixedPipelineState::VertexInput& vertex
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ASSERT(end >= start);
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const std::size_t size{end - start};
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if (size == 0) {
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buffer_bindings.AddVertexBinding(DefaultBuffer(), 0);
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continue;
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}
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const auto [buffer, offset] = buffer_cache.UploadMemory(start, size);
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buffer_bindings.AddVertexBinding(buffer, offset);
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}
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@ -990,8 +994,7 @@ void RasterizerVulkan::SetupConstBuffer(const ConstBufferEntry& entry,
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const Tegra::Engines::ConstBufferInfo& buffer) {
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if (!buffer.enabled) {
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// Set values to zero to unbind buffers
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update_descriptor_queue.AddBuffer(buffer_cache.GetEmptyBuffer(sizeof(float)), 0,
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sizeof(float));
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update_descriptor_queue.AddBuffer(DefaultBuffer(), 0, DEFAULT_BUFFER_SIZE);
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return;
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}
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@ -1014,7 +1017,9 @@ void RasterizerVulkan::SetupGlobalBuffer(const GlobalBufferEntry& entry, GPUVAdd
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if (size == 0) {
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// Sometimes global memory pointers don't have a proper size. Upload a dummy entry
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// because Vulkan doesn't like empty buffers.
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constexpr std::size_t dummy_size = 4;
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// Note: Do *not* use DefaultBuffer() here, storage buffers can be written breaking the
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// default buffer.
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static constexpr std::size_t dummy_size = 4;
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const auto buffer = buffer_cache.GetEmptyBuffer(dummy_size);
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update_descriptor_queue.AddBuffer(buffer, 0, dummy_size);
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return;
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@ -1226,4 +1231,29 @@ RenderPassParams RasterizerVulkan::GetRenderPassParams(Texceptions texceptions)
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return renderpass_params;
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}
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VkBuffer RasterizerVulkan::DefaultBuffer() {
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if (default_buffer) {
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return *default_buffer;
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}
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VkBufferCreateInfo ci;
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ci.sType = VK_STRUCTURE_TYPE_BUFFER_CREATE_INFO;
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ci.pNext = nullptr;
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ci.flags = 0;
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ci.size = DEFAULT_BUFFER_SIZE;
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ci.usage = VK_BUFFER_USAGE_TRANSFER_DST_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT |
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VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT;
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ci.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
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ci.queueFamilyIndexCount = 0;
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ci.pQueueFamilyIndices = nullptr;
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default_buffer = device.GetLogical().CreateBuffer(ci);
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default_buffer_commit = memory_manager.Commit(default_buffer, false);
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scheduler.RequestOutsideRenderPassOperationContext();
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scheduler.Record([buffer = *default_buffer](vk::CommandBuffer cmdbuf) {
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cmdbuf.FillBuffer(buffer, 0, DEFAULT_BUFFER_SIZE, 0);
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});
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return *default_buffer;
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}
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} // namespace Vulkan
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@ -148,6 +148,7 @@ private:
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using Texceptions = std::bitset<Maxwell::NumRenderTargets + 1>;
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static constexpr std::size_t ZETA_TEXCEPTION_INDEX = 8;
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static constexpr VkDeviceSize DEFAULT_BUFFER_SIZE = 4 * sizeof(float);
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void FlushWork();
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@ -240,6 +241,8 @@ private:
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RenderPassParams GetRenderPassParams(Texceptions texceptions) const;
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VkBuffer DefaultBuffer();
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Core::System& system;
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Core::Frontend::EmuWindow& render_window;
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VKScreenInfo& screen_info;
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@ -263,6 +266,9 @@ private:
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VKSamplerCache sampler_cache;
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VKQueryCache query_cache;
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vk::Buffer default_buffer;
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VKMemoryCommit default_buffer_commit;
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std::array<View, Maxwell::NumRenderTargets> color_attachments;
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View zeta_attachment;
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@ -81,7 +81,7 @@ VKBuffer& VKStagingBufferPool::CreateStagingBuffer(std::size_t size, bool host_v
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ci.size = 1ULL << log2;
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ci.usage = VK_BUFFER_USAGE_TRANSFER_SRC_BIT | VK_BUFFER_USAGE_TRANSFER_DST_BIT |
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VK_BUFFER_USAGE_UNIFORM_BUFFER_BIT | VK_BUFFER_USAGE_STORAGE_BUFFER_BIT |
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VK_BUFFER_USAGE_INDEX_BUFFER_BIT;
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VK_BUFFER_USAGE_INDEX_BUFFER_BIT | VK_BUFFER_USAGE_VERTEX_BUFFER_BIT;
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ci.sharingMode = VK_SHARING_MODE_EXCLUSIVE;
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ci.queueFamilyIndexCount = 0;
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ci.pQueueFamilyIndices = nullptr;
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