From 6b0bc52a1bda193b2a57868a599127262145f6eb Mon Sep 17 00:00:00 2001 From: Sascha Willems Date: Fri, 21 Jan 2022 13:35:06 +0100 Subject: [PATCH] Code cleanup and readme for vertex attributes sample --- examples/vertexattributes/README.md | 58 +++++++++++++++++- .../vertexattributes/interleavedbuffer.png | Bin 0 -> 9565 bytes examples/vertexattributes/separatebuffers.png | Bin 0 -> 18867 bytes .../vertexattributes/vertexattributes.cpp | 38 ++++++------ 4 files changed, 77 insertions(+), 19 deletions(-) create mode 100644 examples/vertexattributes/interleavedbuffer.png create mode 100644 examples/vertexattributes/separatebuffers.png diff --git a/examples/vertexattributes/README.md b/examples/vertexattributes/README.md index 2900bf26..16969750 100644 --- a/examples/vertexattributes/README.md +++ b/examples/vertexattributes/README.md @@ -2,4 +2,60 @@ ## Synopsis -This sample demonstrates how to pass vertex attributes using interleaved or separate buffers. \ No newline at end of file +This sample demonstrates two different ways of providing vertex data to the GPU using either interleaved or separate buffers for vertex attributes. + +## Shader interface + +The shader interface for passing the vertex attributes is the same, no matter if the data provided is coming from a single interleaved or multiple separate buffers. + +```glsl +layout (location = 0) in vec3 inPos; +layout (location = 1) in vec3 inNormal; +layout (location = 2) in vec2 inUV; +layout (location = 3) in vec4 inTangent; +``` + +## Interleaved vertex attributes + +In an interleaved vertex buffer, the components that make up a single vertex are stored after each other, so the stride of a single vertex is the sum of it's component's sizes. + +![Interleaved buffer layout](interleavedbuffer.png) + +```cpp +// Binding +const std::vector vertexInputBindingsInterleaved = { + { 0, sizeof(Vertex), VK_VERTEX_INPUT_RATE_VERTEX }, +}; + +// Attribute +const std::vector vertexInputAttributesInterleaved = { + { 0, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, pos) }, + { 1, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, normal) }, + { 2, 0, VK_FORMAT_R32G32_SFLOAT, offsetof(Vertex, uv) }, + { 3, 0, VK_FORMAT_R32G32B32A32_SFLOAT, offsetof(Vertex, tangent) }, +}; +``` + +## Separate vertex attributes + +When using separate buffers, each component is stored in it's own buffer. So e.g. the position buffer only contains vertex positions stored consecutively. + +![Interleaved buffer layout](separatebuffers.png) + +```cpp +// Bindings +const std::vector vertexInputBindingsSeparate = { + { 0, sizeof(glm::vec3), VK_VERTEX_INPUT_RATE_VERTEX }, + { 1, sizeof(glm::vec3), VK_VERTEX_INPUT_RATE_VERTEX }, + { 2, sizeof(glm::vec2), VK_VERTEX_INPUT_RATE_VERTEX }, + { 3, sizeof(glm::vec4), VK_VERTEX_INPUT_RATE_VERTEX }, +}; + +// Attributes +const std::vector vertexInputAttributesSeparate = { + { 0, 0, VK_FORMAT_R32G32B32_SFLOAT, 0 }, + { 1, 1, VK_FORMAT_R32G32B32_SFLOAT, 0 }, + { 2, 2, VK_FORMAT_R32G32_SFLOAT, 0 }, + { 3, 3, VK_FORMAT_R32G32B32A32_SFLOAT, 0 }, +}; +``` \ No newline at end of file diff --git a/examples/vertexattributes/interleavedbuffer.png b/examples/vertexattributes/interleavedbuffer.png new file mode 100644 index 0000000000000000000000000000000000000000..109de3a015ebbe9d710df2a08f105888db62e59b GIT binary patch literal 9565 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glm::make_vec3(&normalsBuffer[v * 3]) : glm::vec3(0.0f))); vert.uv = texCoordsBuffer ? glm::make_vec2(&texCoordsBuffer[v * 2]) : glm::vec3(0.0f); vert.tangent = tangentsBuffer ? glm::make_vec4(&tangentsBuffer[v * 4]) : glm::vec4(0.0f); - vertexBuffer.push_back(vert); + vertexBuffer.push_back(vert); // Append separate attributes vertexAttributes.pos.push_back(glm::make_vec3(&positionBuffer[v * 3])); @@ -230,7 +230,8 @@ void VulkanExample::buildCommandBuffers() VkDeviceSize offsets[4] = { 0, 0, 0, 0 }; std::array buffers = { separateVertexBuffers.pos.buffer, separateVertexBuffers.normal.buffer, separateVertexBuffers.uv.buffer, separateVertexBuffers.tangent.buffer }; vkCmdBindVertexBuffers(drawCmdBuffers[i], 0, static_cast(buffers.size()), buffers.data(), offsets); - } else { + } + else { // Using interleaved attribute bindings only requires one buffer to be bound VkDeviceSize offsets[1] = { 0 }; vkCmdBindVertexBuffers(drawCmdBuffers[i], 0, 1, &interleavedVertexBuffer.buffer, offsets); @@ -319,7 +320,7 @@ void VulkanExample::uploadVertexData() // Create a staging buffer used as a source for copies auto createStagingBuffer = [this](vks::Buffer& buffer, void* data, VkDeviceSize size) { VK_CHECK_RESULT(vulkanDevice->createBuffer(VK_BUFFER_USAGE_TRANSFER_SRC_BIT, VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT, &buffer, size, data)); - }; + }; // Create a device local buffer used as a target for copies auto createDeviceBuffer = [this](vks::Buffer& buffer, VkDeviceSize size, VkBufferUsageFlags usageFlags = VK_BUFFER_USAGE_VERTEX_BUFFER_BIT) { VK_CHECK_RESULT(vulkanDevice->createBuffer(usageFlags | VK_BUFFER_USAGE_TRANSFER_DST_BIT, VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT, &buffer, size)); @@ -492,13 +493,13 @@ void VulkanExample::preparePipelines() // Interleaved vertex attributes // One Binding (one buffer) and multiple attributes const std::vector vertexInputBindingsInterleaved = { - vks::initializers::vertexInputBindingDescription(0, sizeof(Vertex), VK_VERTEX_INPUT_RATE_VERTEX), + { 0, sizeof(Vertex), VK_VERTEX_INPUT_RATE_VERTEX }, }; const std::vector vertexInputAttributesInterleaved = { - vks::initializers::vertexInputAttributeDescription(0, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, pos)), - vks::initializers::vertexInputAttributeDescription(0, 1, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, normal)), - vks::initializers::vertexInputAttributeDescription(0, 2, VK_FORMAT_R32G32_SFLOAT, offsetof(Vertex, uv)), - vks::initializers::vertexInputAttributeDescription(0, 3, VK_FORMAT_R32G32B32A32_SFLOAT, offsetof(Vertex, tangent)), + { 0, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, pos) }, + { 1, 0, VK_FORMAT_R32G32B32_SFLOAT, offsetof(Vertex, normal) }, + { 2, 0, VK_FORMAT_R32G32_SFLOAT, offsetof(Vertex, uv) }, + { 3, 0, VK_FORMAT_R32G32B32A32_SFLOAT, offsetof(Vertex, tangent) }, }; vertexInputStateCI = vks::initializers::pipelineVertexInputStateCreateInfo(vertexInputBindingsInterleaved, vertexInputAttributesInterleaved); @@ -507,17 +508,18 @@ void VulkanExample::preparePipelines() // Separate vertex attribute // Multiple bindings (for each attribute buffer) and multiple attribues const std::vector vertexInputBindingsSeparate = { - vks::initializers::vertexInputBindingDescription(0, sizeof(glm::vec3), VK_VERTEX_INPUT_RATE_VERTEX), - vks::initializers::vertexInputBindingDescription(1, sizeof(glm::vec3), VK_VERTEX_INPUT_RATE_VERTEX), - vks::initializers::vertexInputBindingDescription(2, sizeof(glm::vec2), VK_VERTEX_INPUT_RATE_VERTEX), - vks::initializers::vertexInputBindingDescription(3, sizeof(glm::vec4), VK_VERTEX_INPUT_RATE_VERTEX), + { 0, sizeof(glm::vec3), VK_VERTEX_INPUT_RATE_VERTEX }, + { 1, sizeof(glm::vec3), VK_VERTEX_INPUT_RATE_VERTEX }, + { 2, sizeof(glm::vec2), VK_VERTEX_INPUT_RATE_VERTEX }, + { 3, sizeof(glm::vec4), VK_VERTEX_INPUT_RATE_VERTEX }, }; const std::vector vertexInputAttributesSeparate = { - vks::initializers::vertexInputAttributeDescription(0, 0, VK_FORMAT_R32G32B32_SFLOAT, 0), - vks::initializers::vertexInputAttributeDescription(1, 1, VK_FORMAT_R32G32B32_SFLOAT, 0), - vks::initializers::vertexInputAttributeDescription(2, 2, VK_FORMAT_R32G32_SFLOAT, 0), - vks::initializers::vertexInputAttributeDescription(3, 3, VK_FORMAT_R32G32B32A32_SFLOAT, 0), + { 0, 0, VK_FORMAT_R32G32B32_SFLOAT, 0 }, + { 1, 1, VK_FORMAT_R32G32B32_SFLOAT, 0 }, + { 2, 2, VK_FORMAT_R32G32_SFLOAT, 0 }, + { 3, 3, VK_FORMAT_R32G32B32A32_SFLOAT, 0 }, }; + vertexInputStateCI = vks::initializers::pipelineVertexInputStateCreateInfo(vertexInputBindingsSeparate, vertexInputAttributesSeparate); VK_CHECK_RESULT(vkCreateGraphicsPipelines(device, pipelineCache, 1, &pipelineCI, nullptr, &pipelines.vertexAttributesSeparate)); }