94 lines
3.6 KiB
C
94 lines
3.6 KiB
C
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/*
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* Created by Brett Terpstra 6920201 on 26/10/22.
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* Copyright (c) 2022 Brett Terpstra. All Rights Reserved.
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* stores / handles GL related stuff like implementing functions and common classes
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*/
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#ifndef STEP_3_GL_H
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#define STEP_3_GL_H
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#include <engine/util/std.h>
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#include <engine/types.h>
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#include <engine/image/image.h>
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#include <GLES3/gl32.h>
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#include <GLES3/gl3.h>
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#include <GL/gl.h>
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#include "graphics/gl/glext.h"
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extern PFNGLCREATEVERTEXARRAYSPROC glCreateVertexArrays;
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extern PFNGLCREATEBUFFERSPROC glCreateBuffers;
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extern PFNGLNAMEDBUFFERDATAPROC glNamedBufferData;
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extern PFNGLNAMEDBUFFERSUBDATAPROC glNamedBufferSubData;
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extern PFNGLENABLEVERTEXARRAYATTRIBPROC glEnableVertexArrayAttrib;
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extern PFNGLVERTEXARRAYATTRIBBINDINGPROC glVertexArrayAttribBinding;
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extern PFNGLVERTEXARRAYATTRIBFORMATPROC glVertexArrayAttribFormat;
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// since we are doing everything with raytracing
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// the purpose of these utility classes are purely for debug
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// such as drawing bounding boxes around a BVH
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class Texture {
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private:
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Texture(const Texture& that); // Disable Copy Constructor
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Texture& operator=(const Texture& that); // Disable Copy Assignment
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protected:
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unsigned int textureID;
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int width, height, channels;
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unsigned char* loadTexture(const std::string& path);
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Raytracing::Image* _image = nullptr;
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unsigned char* data;
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public:
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Texture(Texture &&) noexcept = delete; // Disable move constructor.
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Texture& operator=(Texture &&) noexcept = delete; // Disable Move Assignment
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Texture();
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explicit Texture(const std::string& path);
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explicit Texture(Raytracing::Image* image);
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~Texture();
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void updateImage();
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void bind() const;
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void unbind();
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void enableGlTextures(int textureCount);
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};
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class VAO {
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private:
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unsigned int VaoID, instanceVBO;
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std::vector<unsigned int> VBOs;
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int drawCount = -1, currentTransforms = -1;
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// vertex data
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unsigned int storeData(int attrNumber, int coordSize, int stride, long offset, int length, const float* data);
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// element data (indices)
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unsigned int storeData(int length, const unsigned int *data);
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// instance data
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unsigned int createInstanceVBO(int count, int bytePerInstance);
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// used much in the same way that store data sets an attribute where the data is expected
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// except this sets based on the master instance vbo, telling the GPU where to use the data and when.
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void addInstancedAttribute(int attribute, int dataSize, int dataLengthBytes, int offset) const;
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// disable bad constructors
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// we can't just make copies of GPU objects like we can on the CPU. It's stupidly expensive.
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VAO() = default;
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VAO(const VAO& that); // Disable Copy Constructor
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VAO& operator=(const VAO& that); // Disable Copy Assignment
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public:
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VAO(VAO &&) noexcept = delete; // Disable move constructor.
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VAO& operator=(VAO &&) noexcept = delete; // Disable Move Assignment
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VAO(const std::vector<Raytracing::Triangle> &triangles);
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VAO(const std::vector<float>& verts, const std::vector<float>& uvs, const std::vector<unsigned int>& indices);
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void bind() const;
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void unbind();
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// draws as if it where a fullscreen quad (literally used for that)
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void draw() const;
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// draw as if it's a box that we need to bulk draw.
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void draw(const std::vector<Raytracing::Vec4>& positions);
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~VAO();
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};
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// should be called by the window class to get the function pointers.
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void assignGLFunctionPointers();
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#endif //STEP_3_GL_H
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