GraphicsPipeline.cpp

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/*
   Copyright 2022 Rishi Challa
 
   Licensed under the Apache License, Version 2.0 (the "License") {
    
}
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at
 
       http://www.apache.org/licenses/LICENSE-2.0
 
   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/
 
#ifdef KALE_VULKAN
 
#include "GraphicsPipeline.hpp"
 
#include <Kale/Vulkan/Core/Core.hpp>
#include <Kale/Vulkan/Device/Device.hpp>
 
#include <array>
 
using namespace Kale;
using namespace Kale::Vulkan;
 
GraphicsPipeline::GraphicsPipeline() {
    // Empty Body
}
 
GraphicsPipeline::GraphicsPipeline(const std::string& vert, const std::string& frag, const Renderer& renderer) {
    init(vert, frag, renderer);
}
 
void GraphicsPipeline::createPipelineLayout() {
    vk::PipelineLayoutCreateInfo layoutCreateInfo;
    layout = Core::device.logicalDevice->createPipelineLayoutUnique(layoutCreateInfo);
}
 
void GraphicsPipeline::init(const std::string& vert, const std::string& frag, const Renderer& renderer) {
    ChildResource::init(Core::swapchain);
 
    // Shaders
    Shader vertShader(vert, ShaderType::Vertex, Core::device);
    Shader fragShader(frag, ShaderType::Fragment, Core::device);
    std::array<vk::PipelineShaderStageCreateInfo, 2> shaderStage = {
        vertShader.getShaderPipelineInfo(),
        fragShader.getShaderPipelineInfo()
    };
 
    // Vertex Input - Choose defaults
    vk::PipelineVertexInputStateCreateInfo vertexCreateInfo;
 
    // Input Assembly
    vk::PipelineInputAssemblyStateCreateInfo inputAssemblyCreateInfo(vk::PipelineInputAssemblyStateCreateFlags(),
        vk::PrimitiveTopology::eTriangleList, VK_FALSE);
 
    // Viewports & Scissors
    vk::Viewport viewport(0.0f, 0.0f, static_cast<float>(Core::swapchain.extent.width),
        static_cast<float>(Core::swapchain.extent.height), 0.0f, 1.0f);
    vk::Rect2D scissors(vk::Offset2D(), Core::swapchain.extent);
    vk::PipelineViewportStateCreateInfo viewportCreateInfo(vk::PipelineViewportStateCreateFlags(),
        1, &viewport, 1, &scissors);
 
    // Rasterizer
    vk::PipelineRasterizationStateCreateInfo rasterizerCreateInfo;
    rasterizerCreateInfo.polygonMode = vk::PolygonMode::eFill;
    rasterizerCreateInfo.cullMode = vk::CullModeFlagBits::eBack;
    rasterizerCreateInfo.lineWidth = 1.0f;
    rasterizerCreateInfo.frontFace = vk::FrontFace::eClockwise;
 
    // Multisampling
    vk::PipelineMultisampleStateCreateInfo multisamplingCreateInfo;
    multisamplingCreateInfo.minSampleShading = 1.0f;
 
    // Color Blending
    vk::PipelineColorBlendAttachmentState attachmentState(VK_TRUE, vk::BlendFactor::eSrcAlpha,
        vk::BlendFactor::eOneMinusSrcAlpha, vk::BlendOp::eAdd, vk::BlendFactor::eOne,
        vk::BlendFactor::eZero, vk::BlendOp::eAdd, vk::ColorComponentFlagBits::eR | vk::ColorComponentFlagBits::eG |
        vk::ColorComponentFlagBits::eB | vk::ColorComponentFlagBits::eA);
 
    vk::PipelineColorBlendStateCreateInfo colorBlendingCreateInfo(vk::PipelineColorBlendStateCreateFlags(),
        VK_FALSE, vk::LogicOp::eCopy, 1, &attachmentState);
 
    // Dynamic State - Viewport will not change on android/ios
    #if defined(KALE_IOS) || defined(KALE_ANDROID)
    std::vector<vk::DynamicState> dynamicStates;
    #else
    std::vector<vk::DynamicState> dynamicStates = {vk::DynamicState::eViewport};
    #endif
    vk::PipelineDynamicStateCreateInfo dynamicCreateInfo(vk::PipelineDynamicStateCreateFlags(),
        static_cast<uint32_t>(dynamicStates.size()), dynamicStates.data());
 
    // Pipeline Layout
    createPipelineLayout();
 
    // Pipeline Create Info
    vk::GraphicsPipelineCreateInfo createInfo(vk::PipelineCreateFlags(), 2, shaderStage.data(), &vertexCreateInfo,
        &inputAssemblyCreateInfo, nullptr, &viewportCreateInfo, &rasterizerCreateInfo, &multisamplingCreateInfo,
        nullptr, &colorBlendingCreateInfo, &dynamicCreateInfo, layout.get(), renderer.renderPass.get());
    pipeline = Core::device.logicalDevice->createGraphicsPipelineUnique({}, createInfo).value;
}
 
void GraphicsPipeline::freeResources(bool remove) {
    ChildResource::freeResources(remove);
    layout.reset();
    pipeline.reset();
}
 
#endif