Nove repo opengl-learning
This commit is contained in:
TheRetikGM
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#include "Framebuffer.h"
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#include <glad/glad.h>
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#include <iostream>
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#include <vector>
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#include "DebugColors.h"
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#include <stb_image_write.h>
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#include <ctime>
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int checkFramebufferStatus()
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{
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int status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
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switch (status)
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{
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case GL_FRAMEBUFFER_COMPLETE:
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return 0;
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break;
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default:
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fprintf(stderr, "Framebuffer.h: " DC_ERROR " code: %#04x\n", (int)status);
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return -1;
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break;
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}
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}
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Framebuffer::Framebuffer(const int& width, const int& height)
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{
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glGenFramebuffers(1, &ID);
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glGenTextures(1, &ColorBuffer);
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glBindTexture(GL_TEXTURE_2D, ColorBuffer);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glBindTexture(GL_TEXTURE_2D, 0);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, ColorBuffer, 0);
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glGenRenderbuffers(1, &DepthStencilBuffer);
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glBindRenderbuffer(GL_RENDERBUFFER, DepthStencilBuffer);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
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glBindRenderbuffer(GL_RENDERBUFFER, 0);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, DepthStencilBuffer);
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if (checkFramebufferStatus() != 0)
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{
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glDeleteRenderbuffers(1, &DepthStencilBuffer);
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glDeleteTextures(1, &ColorBuffer);
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glDeleteFramebuffers(1, &ID);
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std::cerr << "Framebuffer.h: " DC_ERROR " Could not create framebuffer object." << std::endl;
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ID = 0;
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return;
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}
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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this->width = width;
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this->height = height;
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}
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Framebuffer::~Framebuffer()
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{
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destroy();
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}
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void Framebuffer::destroy()
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{
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glDeleteRenderbuffers(1, &DepthStencilBuffer);
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glDeleteTextures(1, &ColorBuffer);
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glDeleteFramebuffers(1, &ID);
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}
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void Framebuffer::UpdateSize(const unsigned int& newWidth, const unsigned int& newHeight)
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{
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if (!checkBind())
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glBindTexture(GL_TEXTURE_2D, ColorBuffer);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, newWidth, newHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
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glBindTexture(GL_TEXTURE_2D, 0);
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glDeleteRenderbuffers(1, &DepthStencilBuffer);
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glGenRenderbuffers(1, &DepthStencilBuffer);
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glBindRenderbuffer(GL_RENDERBUFFER, DepthStencilBuffer);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, newWidth, newHeight);
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glBindRenderbuffer(GL_RENDERBUFFER, 0);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, DepthStencilBuffer);
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}
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void Framebuffer::Use()
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{
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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}
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void Framebuffer::UseDefault()
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{
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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void Framebuffer::clearBuffers(float r, float g, float b, float a)
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{
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if (!checkBind())
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glClearColor(r, g, b, a);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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}
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void Framebuffer::clearColorBuffer(float r, float g, float b, float a)
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{
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if (!checkBind())
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glClearColor(r, g, b, a);
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glClear(GL_COLOR_BUFFER_BIT);
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}
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void Framebuffer::clearDepthBuffer()
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{
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if (!checkBind())
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glClear(GL_DEPTH_BUFFER_BIT);
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}
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void Framebuffer::clearStencilBuffer()
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{
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if (!checkBind())
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glClear(GL_STENCIL_BUFFER_BIT);
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}
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void Framebuffer::clearDepthStencilBuffer()
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{
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if (!checkBind())
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glClear(GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
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}
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unsigned int Framebuffer::getWidth()
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{
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return width;
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}
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unsigned int Framebuffer::getHeight()
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{
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return height;
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}
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bool Framebuffer::checkBind()
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{
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int id = 0;
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glGetIntegerv(GL_FRAMEBUFFER_BINDING, &id);
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if ((unsigned int)id == ID)
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return true;
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return false;
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}
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unsigned int Framebuffer::getColorBuffer()
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{
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return ColorBuffer;
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}
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unsigned int Framebuffer::getDepthSnectilBuffer()
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{
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return DepthStencilBuffer;
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}
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std::string Framebuffer::screenshot(std::string path)
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{
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int id = 0;
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glGetIntegerv(GL_FRAMEBUFFER_BINDING, &id);
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unsigned char *data = new unsigned char[(int)width * (int)height * 4];
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this->Use();
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glReadBuffer(GL_COLOR_ATTACHMENT0);
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glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data);
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stbi_flip_vertically_on_write(1);
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std::string scr_name = path + "/" + getScreenshotName();
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stbi_write_png(scr_name.c_str(), width, height, 4, data, 4 * width);
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delete data;
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glBindFramebuffer(GL_FRAMEBUFFER, (unsigned int)id);
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return scr_name;
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}
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MSFramebuffer::MSFramebuffer(const int& width, const int& height, const unsigned int samples)
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: Nsamples(samples), intermediateFBO(NULL)
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{
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glGenFramebuffers(1, &ID);
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glGenTextures(1, &ColorBuffer);
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glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, ColorBuffer);
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glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, samples, GL_RGB, width, height, GL_TRUE);
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glTexParameteri(GL_TEXTURE_2D_MULTISAMPLE, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D_MULTISAMPLE, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, 0);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D_MULTISAMPLE, ColorBuffer, 0);
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glGenRenderbuffers(1, &DepthStencilBuffer);
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glBindRenderbuffer(GL_RENDERBUFFER, DepthStencilBuffer);
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glRenderbufferStorageMultisample(GL_RENDERBUFFER, samples, GL_DEPTH24_STENCIL8, width, height);
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glBindRenderbuffer(GL_RENDERBUFFER, 0);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, DepthStencilBuffer);
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if (checkFramebufferStatus() != 0)
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{
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glDeleteRenderbuffers(1, &DepthStencilBuffer);
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glDeleteTextures(1, &ColorBuffer);
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glDeleteFramebuffers(1, &ID);
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std::cerr << "Framebuffer.h: " DC_ERROR " Could not create multisampled framebuffer object." << std::endl;
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ID = 0;
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return;
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}
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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this->width = width;
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this->height = height;
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intermediateFBO = new Framebuffer(width, height);
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}
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MSFramebuffer::~MSFramebuffer()
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{
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destroy();
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delete intermediateFBO;
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}
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std::string MSFramebuffer::screenshot(std::string path)
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{
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int id = 0;
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glGetIntegerv(GL_FRAMEBUFFER_BINDING, &id);
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unsigned char *data = new unsigned char[width * height * 4];
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getColorBuffer();
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intermediateFBO->Use();
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glReadBuffer(GL_COLOR_ATTACHMENT0);
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glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data);
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stbi_flip_vertically_on_write(1);
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std::string scr_name = path + "/" + getScreenshotName();
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stbi_write_png(scr_name.c_str(), width, height, 4, data, 4 * width);
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delete data;
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glBindFramebuffer(GL_FRAMEBUFFER, (unsigned int)id);
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return scr_name;
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}
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void MSFramebuffer::UpdateSize(const unsigned int& newWidth, const unsigned int& newHeight)
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{
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if (!checkBind())
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, ColorBuffer);
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glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, Nsamples, GL_RGBA, newWidth, newHeight, GL_TRUE);
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glBindTexture(GL_TEXTURE_2D_MULTISAMPLE, 0);
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glDeleteRenderbuffers(1, &DepthStencilBuffer);
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glGenRenderbuffers(1, &DepthStencilBuffer);
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glBindRenderbuffer(GL_RENDERBUFFER, DepthStencilBuffer);
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glRenderbufferStorageMultisample(GL_RENDERBUFFER, Nsamples, GL_DEPTH24_STENCIL8, newWidth, newHeight);
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glBindRenderbuffer(GL_RENDERBUFFER, 0);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, DepthStencilBuffer);
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}
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unsigned int MSFramebuffer::getColorBuffer()
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{
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glBindFramebuffer(GL_READ_FRAMEBUFFER, ID);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, intermediateFBO->ID);
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glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, GL_COLOR_BUFFER_BIT, GL_NEAREST);
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glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
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return intermediateFBO->getColorBuffer();
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}
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unsigned int MSFramebuffer::getDepthSnectilBuffer()
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{
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glBindFramebuffer(GL_READ_FRAMEBUFFER, ID);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, intermediateFBO->ID);
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glBlitFramebuffer(0, 0, width, height, 0, 0, width, height, GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT, GL_NEAREST);
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glBindFramebuffer(GL_READ_FRAMEBUFFER, 0);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
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return intermediateFBO->getDepthSnectilBuffer();
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}
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unsigned int MSFramebuffer::getColorBufferMS()
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{
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return ColorBuffer;
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}
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/* Static functions */
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void Framebuffer::clearAllBuffers(float r, float g, float b, float a)
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{
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glClearColor(r, g, b, a);
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glClear(GL_COLOR_BUFFER_BIT | GL_STENCIL_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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}
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std::string Framebuffer::getScreenshotName()
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{
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time_t tim = time(NULL);
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struct tm *ltm = localtime(&tim);
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char buf[50];
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snprintf(buf, sizeof(buf), "screenshot_%i%02i%02i_%02i%02i%02i.png",
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ltm->tm_year + 1900, ltm->tm_mon + 1, ltm->tm_mday, ltm->tm_hour, ltm->tm_min, ltm->tm_sec);
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return std::string(buf);
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}
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std::string Framebuffer::screenshot_defaultFBO(unsigned int width, unsigned int height, std::string path)
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{
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int id = 0;
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glGetIntegerv(GL_FRAMEBUFFER_BINDING, &id);
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uint8_t *data = new uint8_t[width * height * 4];
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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glReadPixels(0, 0, width, height, GL_RGBA, GL_UNSIGNED_BYTE, data);
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stbi_flip_vertically_on_write(1);
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std::string scr_name = path + "/" + getScreenshotName();
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stbi_write_png(scr_name.c_str(), width, height, 4, data, 4 * width);
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delete[] data;
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glBindFramebuffer(GL_FRAMEBUFFER, (unsigned int)id);
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return scr_name;
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}
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/* Depthmap Framebuffer */
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DepthmapFramebuffer::DepthmapFramebuffer(const Resolution& resolution) : resolution(resolution), depth_texture(0), ID(0)
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{
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glGenFramebuffers(1, &ID);
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glGenTextures(1, &depth_texture);
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glBindTexture(GL_TEXTURE_2D, depth_texture);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_DEPTH_COMPONENT, resolution.Width, resolution.Height, 0, GL_DEPTH_COMPONENT, GL_FLOAT, NULL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER);
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float borderColor[]{ 1.0f, 1.0f, 1.0f, 1.0f };
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glTexParameterfv(GL_TEXTURE_2D, GL_TEXTURE_BORDER_COLOR, borderColor);
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glBindTexture(GL_TEXTURE_2D, 0);
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, depth_texture, 0);
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glDrawBuffer(GL_NONE);
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glReadBuffer(GL_NONE);
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if (checkFramebufferStatus() != 0)
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{
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glDeleteFramebuffers(1, &ID);
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glDeleteTextures(1, &depth_texture);
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std::cerr << "Framebuffer.h " << DC_ERROR << " Could not create Depthmap Framebuffer object.\n";
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ID = 0;
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return;
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}
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}
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DepthmapFramebuffer::DepthmapFramebuffer(const unsigned int& width, const unsigned int& height) :
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DepthmapFramebuffer(Resolution{width, height})
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{}
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DepthmapFramebuffer::~DepthmapFramebuffer()
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{
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glDeleteFramebuffers(1, &ID);
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glDeleteTextures(1, &depth_texture);
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}
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void DepthmapFramebuffer::Use() const
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{
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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}
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void DepthmapFramebuffer::Use(GLenum target) const
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{
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glBindFramebuffer(target, ID);
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}
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unsigned int DepthmapFramebuffer::GetDepthTexture() const
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{
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return depth_texture;
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}
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void DepthmapFramebuffer::ClearDepthBuffer() const
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{
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Use();
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glClear(GL_DEPTH_BUFFER_BIT);
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}
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/* DepthCubemap Framebuffer */
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DepthCubeFramebuffer::DepthCubeFramebuffer(int width, int height) : Width(width), Height(height)
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{
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init();
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}
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DepthCubeFramebuffer::~DepthCubeFramebuffer()
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{
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glDeleteFramebuffers(1, &ID);
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glDeleteTextures(1, &depthCubemap);
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}
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void DepthCubeFramebuffer::init()
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{
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glGenTextures(1, &depthCubemap);
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glBindTexture(GL_TEXTURE_CUBE_MAP, depthCubemap);
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for (unsigned int i = 0; i < 6; i++)
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glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_DEPTH_COMPONENT, Width, Height, 0,
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GL_DEPTH_COMPONENT, GL_FLOAT, 0);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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glBindTexture(GL_TEXTURE_CUBE_MAP, 0);
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glGenFramebuffers(1, &ID);
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glBindFramebuffer(GL_FRAMEBUFFER, ID);
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glFramebufferTexture(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, depthCubemap, 0);
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glDrawBuffer(GL_NONE);
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glReadBuffer(GL_NONE);
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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if (checkFramebufferStatus() != 0)
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{
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ID = 0;
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}
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}
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unsigned int DepthCubeFramebuffer::getDepthCubemap() const
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{
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return depthCubemap;
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}
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void DepthCubeFramebuffer::clearDepth() const
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{
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glClear(GL_DEPTH_BUFFER_BIT);
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}
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void DepthCubeFramebuffer::Use() const
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{
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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