OpenglFramebuffer.h

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#pragma once
 
#include "RenderCore/ghi_fwd.h"
#include "RenderCore/ghi_enums.h"
#include "RenderCore/OpenGL/opengl_enums.h"
 
#include "ThirdParty/glad2.h"
 
#include <Common/primitive_type.h>
#include <Math/TVector4.h>
 
#include <array>
#include <string>
 
namespace ph::editor::ghi
{
 
class OpenglTexture;
 
class OpenglColorAttachment final
{
public:
    GLenum internalFormat = GL_NONE;
    TextureHandle handle;
 
    bool isAttached() const
    {
        return !handle.isEmpty();
    }
};
 
class OpenglDepthStencilAttachment final
{
public:
    GLenum internalFormat = GL_NONE;
    GLenum attachmentType = GL_NONE;
    TextureHandle handle;
 
    bool isAttached() const
    {
        return !handle.isEmpty();
    }
};
 
class OpenglFramebuffer final
{
public:
    // Can actually allow more. Standard requires at least 8 (which should be enough for most use cases).
    inline static constexpr GLuint MAX_COLOR_ATTACHMENTS = 8;
 
    GLuint framebufferID = 0;
    GLsizei widthPx = 0;
    GLsizei heightPx = 0;
    GLsizei numSamples = 1;
    std::array<OpenglColorAttachment, MAX_COLOR_ATTACHMENTS> colorAttachments;
    OpenglDepthStencilAttachment depthStencilAttachment;
 
    void createBuffer(const FramebufferDesc& desc);
 
    void attachColor(
        uint32 attachmentIdx,
        const OpenglTexture& colorTexture, 
        TextureHandle handle);
 
    void attachDepthStencil(
        const OpenglTexture& depthStencilTexture,
        TextureHandle handle);
    
    void bind();
    void unbind();
    void clearColor(uint32 attachmentIdx, const math::Vector4F& color);
    void clearDepthStencil(float32 depth, uint8 stencil);
    void destroy();
    bool checkCompleteness();
 
    bool hasResource() const;
 
private:
    void createDeviceColorTexture(uint32 attachmentIndex);
    void createDeviceDepthStencilTexture();
    static std::string getFramebufferStatusInfo(GLuint framebufferID);
};
 
}// end namespace ph::editor::ghi