82 lines
2.0 KiB
C++
82 lines
2.0 KiB
C++
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// src/Rendering/FBO.cpp
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#include "FBO.h"
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#include <cstdio>
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bool FBO::Create(int width, int height)
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{
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Cleanup(); // In case we already had one
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m_Width = width;
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m_Height = height;
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// 1) Generate FBO
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glGenFramebuffers(1, &m_FBO);
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glBindFramebuffer(GL_FRAMEBUFFER, m_FBO);
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// 2) Create Texture
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glGenTextures(1, &m_TextureID);
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glBindTexture(GL_TEXTURE_2D, m_TextureID);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, nullptr);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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GL_TEXTURE_2D, m_TextureID, 0);
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// 3) Create RBO for depth/stencil
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glGenRenderbuffers(1, &m_RBO);
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glBindRenderbuffer(GL_RENDERBUFFER, m_RBO);
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glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT,
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GL_RENDERBUFFER, m_RBO);
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// 4) Check completeness
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if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
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{
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fprintf(stderr, "[FBO] Framebuffer not complete!\n");
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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Cleanup();
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return false;
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}
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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return true;
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}
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void FBO::Cleanup()
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{
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if (m_TextureID)
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{
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glDeleteTextures(1, &m_TextureID);
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m_TextureID = 0;
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}
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if (m_RBO)
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{
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glDeleteRenderbuffers(1, &m_RBO);
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m_RBO = 0;
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}
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if (m_FBO)
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{
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glDeleteFramebuffers(1, &m_FBO);
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m_FBO = 0;
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}
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}
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void FBO::Bind()
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{
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glBindFramebuffer(GL_FRAMEBUFFER, m_FBO);
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}
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void FBO::Unbind()
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{
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glBindFramebuffer(GL_FRAMEBUFFER, 0);
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}
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ImTextureID FBO::GetTextureID() const
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{
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// For OpenGL + ImGui, typically cast GLuint to (ImTextureID) via uintptr_t
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return (ImTextureID)(uintptr_t)m_TextureID;
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}
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