HuYingzhuo
e35fbf9a1a
VertexInputState传递给Material，未来可能改由Material创建，提供需要绑定的数据流格式。 VertexInput用于实际的缓冲区绑定
77 lines
2.4 KiB
C++
77 lines
2.4 KiB
C++
#include"VKVertexInput.h"
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#include"VKBuffer.h"
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VK_NAMESPACE_BEGIN
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void VertexInputState::Add(const uint32_t shader_location,const VkFormat format,uint32_t offset,bool instance)
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{
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const int binding_index=binding_list.GetCount(); //参考opengl vab,binding_index必须从0开始，紧密排列。对应在vkCmdBindVertexBuffer中的缓冲区索引
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binding_list.SetCount(binding_index+1);
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attribute_list.SetCount(binding_index+1);
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VkVertexInputBindingDescription *binding=binding_list.GetData()+binding_index;
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VkVertexInputAttributeDescription *attrib=attribute_list.GetData()+binding_index;
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binding->binding=binding_index;
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binding->stride=GetStrideByFormat(format);
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binding->inputRate=instance?VK_VERTEX_INPUT_RATE_INSTANCE:VK_VERTEX_INPUT_RATE_VERTEX;
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//实际使用可以一个binding绑多个attrib，但我们仅支持1v1。
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//一个binding是指在vertex shader中，由一个vertex输入流输入数据，attrib指其中的数据成分
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//比如在一个流中传递{pos,color}这样两个数据，就需要两个attrib
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//但我们在一个流中，仅支持一个attrib传递
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attrib->binding=binding_index;
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attrib->location=shader_location;
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attrib->format=format;
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attrib->offset=offset;
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}
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void VertexInputState::Write(VkPipelineVertexInputStateCreateInfo &vis) const
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{
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vis.sType = VK_STRUCTURE_TYPE_PIPELINE_VERTEX_INPUT_STATE_CREATE_INFO;
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vis.vertexBindingDescriptionCount = binding_list.GetCount();
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vis.pVertexBindingDescriptions = binding_list.GetData();
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vis.vertexAttributeDescriptionCount = attribute_list.GetCount();
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vis.pVertexAttributeDescriptions = attribute_list.GetData();
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}
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VertexInput::VertexInput(VertexInputState *state)
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{
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vis=state;
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if(!vis)
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return;
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buf_count=vis->GetCount();
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buf_list=hgl_zero_new<VkBuffer>(buf_count);
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buf_offset=hgl_zero_new<VkDeviceSize>(buf_count);
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}
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VertexInput::~VertexInput()
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{
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delete[] buf_offset;
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delete[] buf_list;
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}
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bool VertexInput::Set(uint32_t index,VertexBuffer *buf,VkDeviceSize offset)
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{
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if(index<0||index>=buf_count)return(false);
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VkVertexInputBindingDescription *desc=vis->GetDesc(index);
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VkVertexInputAttributeDescription *attr=vis->GetAttr(index);
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if(buf->GetFormat()!=attr->format)return(false);
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if(buf->GetStride()!=desc->stride)return(false);
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buf_list[index]=*buf;
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buf_offset[index]=offset;
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return(true);
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}
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VK_NAMESPACE_END
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