基于Vulkan的引擎底层API封装与渲染案例实现

int main()
{
    MaggotApp::Get().SetWindowTitle(L"Moggot Engine");
    MaggotApp::Get().SetWindowSize(1600, 900);
    MaggotApp::Get().SetGameScene<LocalScene>();
    MaggotApp::Get().AddRenderProcess<LocalProcess>();
    MaggotApp::Get().AddRenderProcess<CoordinateProcess>();
    MaggotApp::Get().Run();
    return 0;
}

class LocalVertexShader : public RHIShader
{
	DECLARE_SHADER_BEGIN(LocalVertexShader)
    SET_INPUT_ASSEMBLY(VK_PRIMITIVE_TOPOLOGY_LINE_LIST);
	GROUP_VERTEX_BINGING({ "inPosition", "inNormal" }, VK_VERTEX_INPUT_RATE_VERTEX, sizeof(glm::vec3) * 2);
	GROUP_VERTEX_BINGING({ "inOffset" }, VK_VERTEX_INPUT_RATE_INSTANCE, sizeof(glm::vec3));
	DECLARE_SHADER_END()
};
class LocalFragmentShader : public RHIShader
{
	DECLARE_SHADER_BEGIN(LocalFragmentShader)
	DECLARE_SHADER_END()
};

REGISTER_SHADER(LocalVertexShader, "OitSimple\\Local.vert")
REGISTER_SHADER(LocalFragmentShader, "OitSimple\\Local.frag")

ENQUEUE_RENDER_COMMAND(BuildModel)([this, ubo](VkCommandBuffer commandBuffer)
    {
        Ubo uboData = ubo;
        // 创建 Ubo
        mUboBuffer = CustomBuffer::Builder()
            .SetData(&uboData)
            .SetSize(sizeof(Ubo))
            .SetMemoryProperty(VK_MEMORY_PROPERTY_HOST_VISIBLE_BIT | VK_MEMORY_PROPERTY_HOST_COHERENT_BIT)
            .Build();

        // 通过 RHIDescriptor 生成资源池,资源布局
        mDescriptor = RHIDescriptor::Builder()
            .PushShader<LocalVertexShader>()
            .PushShader<LocalFragmentShader>()
            .SetDescriptorCount(0, 1)
            .Build();

        // 可以直接通过 shader 里的资源名字字符串指定资源
        mDescriptor->SetValue("ubo", mUboBuffer);
        mDescriptorMask = mDescriptor->AllocateDescriptor();

        // 创建颜色与深度RenderTarget
        mColorRenderTarget = ColorRenderTarget::Builder()
            .SetUsage(VK_IMAGE_USAGE_COLOR_ATTACHMENT_BIT | VK_IMAGE_USAGE_SAMPLED_BIT)
            .SetStoreOp(VK_ATTACHMENT_STORE_OP_STORE)
            .SetFinalLayout(VK_IMAGE_LAYOUT_SHADER_READ_ONLY_OPTIMAL)
            .Build();

        mDepthRenderTarget = DepthRenderTarget::Builder()
            .Build();

        // 创建 Pipeline RenderPass FrameBuffer
        mPipeline = GraphicsPipeline::Builder()
            .SetDescriptor(mDescriptor)
            .AddColorRenderTarget(mColorRenderTarget)
            .SetDepthRenderTarget(mDepthRenderTarget)
            .SetDstStageMask(VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT)
            .SetDstAccessMask(VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT)
            .SetSrcStageMask(VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT)
            .SetSrcAccessMask(VK_ACCESS_COLOR_ATTACHMENT_WRITE_BIT)
            .Build();

        mRenderPass = RHIRenderPass::Builder()
            .AddRenderTarget(mColorRenderTarget)
            .AddRenderTarget(mDepthRenderTarget)
            .AddPipeline(mPipeline)
            .SetSrcStageMask(VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT)
            .SetSrcAccessMask(VK_ACCESS_SHADER_READ_BIT)
            .SetDstStageMask(VK_PIPELINE_STAGE_FRAGMENT_SHADER_BIT)
            .SetDstAccessMask(VK_ACCESS_SHADER_READ_BIT)
            .Build();

        mFrameBuffer = RHIFrameBuffer::Builder()
            .SetRenderPass(mRenderPass)
            .Build();
    });