ShaderSet.h

#pragma once
 
/* <editor-fold desc="MIT License">
 
Copyright(c) 2022 Robert Osfield
 
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
</editor-fold> */
 
#include <vsg/core/compare.h>
#include <vsg/state/ArrayState.h>
#include <vsg/state/GraphicsPipeline.h>
#include <vsg/state/Sampler.h>
#include <vsg/state/ShaderStage.h>
 
namespace vsg
{
 
    struct VSG_DECLSPEC AttributeBinding
    {
        std::string name;
        std::string define;
        uint32_t location = 0;
        VkFormat format = VK_FORMAT_UNDEFINED;
        ref_ptr<Data> data;
 
        int compare(const AttributeBinding& rhs) const;
 
        explicit operator bool() const noexcept { return !name.empty(); }
    };
    VSG_type_name(vsg::AttributeBinding);
 
    struct VSG_DECLSPEC UniformBinding
    {
        std::string name;
        std::string define;
        uint32_t set = 0;
        uint32_t binding = 0;
        VkDescriptorType descriptorType = VK_DESCRIPTOR_TYPE_COMBINED_IMAGE_SAMPLER;
        uint32_t descriptorCount = 0;
        VkShaderStageFlags stageFlags = 0;
        ref_ptr<Data> data;
 
        int compare(const UniformBinding& rhs) const;
 
        explicit operator bool() const noexcept { return !name.empty(); }
    };
    VSG_type_name(vsg::UniformBinding);
 
    struct VSG_DECLSPEC PushConstantRange
    {
        std::string name;
        std::string define;
        VkPushConstantRange range;
 
        int compare(const PushConstantRange& rhs) const;
    };
    VSG_type_name(vsg::PushConstantRange);
 
    struct VSG_DECLSPEC DefinesArrayState
    {
        std::set<std::string> defines;
        ref_ptr<ArrayState> arrayState;
 
        int compare(const DefinesArrayState& rhs) const;
    };
    VSG_type_name(vsg::DefinesArrayState);
 
    class VSG_DECLSPEC ShaderSet : public Inherit<Object, ShaderSet>
    {
    public:
        ShaderSet();
        explicit ShaderSet(const ShaderStages& in_stages, ref_ptr<ShaderCompileSettings> in_hints = {});
 
        ShaderStages stages;
 
        std::vector<AttributeBinding> attributeBindings;
        std::vector<UniformBinding> uniformBindings;
        std::vector<PushConstantRange> pushConstantRanges;
        std::vector<DefinesArrayState> definesArrayStates; // put more constrained ArrayState matches first so they are matched first.
        std::set<std::string> optionalDefines;
        GraphicsPipelineStates defaultGraphicsPipelineStates;
 
        ref_ptr<ShaderCompileSettings> defaultShaderHints;
        std::map<ref_ptr<ShaderCompileSettings>, ShaderStages, DereferenceLess> variants;
 
        std::mutex mutex;
 
        void addAttributeBinding(std::string name, std::string define, uint32_t location, VkFormat format, ref_ptr<Data> data);
 
        void addUniformBinding(std::string name, std::string define, uint32_t set, uint32_t binding, VkDescriptorType descriptorType, uint32_t descriptorCount, VkShaderStageFlags stageFlags, ref_ptr<Data> data);
 
        void addPushConstantRange(std::string name, std::string define, VkShaderStageFlags stageFlags, uint32_t offset, uint32_t size);
 
        AttributeBinding& getAttributeBinding(const std::string& name);
 
        UniformBinding& getUniformBinding(const std::string& name);
 
        const AttributeBinding& getAttributeBinding(const std::string& name) const;
 
        const UniformBinding& getUniformBinding(const std::string& name) const;
 
        ref_ptr<ArrayState> getSuitableArrayState(const std::set<std::string>& defines) const;
 
        ShaderStages getShaderStages(ref_ptr<ShaderCompileSettings> scs = {});
 
        int compare(const Object& rhs) const override;
 
        void read(Input& input) override;
        void write(Output& output) const override;
 
    protected:
        virtual ~ShaderSet();
 
        AttributeBinding _nullAttributeBinding;
        UniformBinding _nullUniformBinding;
    };
    VSG_type_name(vsg::ShaderSet);
 
    extern VSG_DECLSPEC ref_ptr<ShaderSet> createFlatShadedShaderSet(ref_ptr<const Options> options = {});
 
    extern VSG_DECLSPEC ref_ptr<ShaderSet> createPhongShaderSet(ref_ptr<const Options> options = {});
 
    extern VSG_DECLSPEC ref_ptr<ShaderSet> createPhysicsBasedRenderingShaderSet(ref_ptr<const Options> options = {});
 
} // namespace vsg