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#include "Framebuffer.hpp"
#include "Shader.hpp"
#include <string>
#include "Utility.hpp"
#include "AssetManager.hpp"
const GLuint magic = 316784;
GLuint quadVao = magic, quadVbo = magic;
Framebuffer::Framebuffer(unsigned int width, unsigned int height, bool createDepthStencilBuffer) : width(width), height(height) {
if (quadVao == magic) {
float quadVertices[] = {
// positions // texCoords
-1.0f, 1.0f, 0.0f, 1.0f,
-1.0f, -1.0f, 0.0f, 0.0f,
1.0f, -1.0f, 1.0f, 0.0f,
-1.0f, 1.0f, 0.0f, 1.0f,
1.0f, -1.0f, 1.0f, 0.0f,
1.0f, 1.0f, 1.0f, 1.0f
};
glGenVertexArrays(1, &quadVao);
glGenBuffers(1, &quadVbo);
glBindVertexArray(quadVao);
glBindBuffer(GL_ARRAY_BUFFER, quadVbo);
glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
AssetManager::GetAsset<AssetShader>("/altcraft/shaders/fbo")->shader->Activate();
AssetManager::GetAsset<AssetShader>("/altcraft/shaders/fbo")->shader->SetUniform("inputTexture", 1);
glActiveTexture(GL_TEXTURE1);
glCheckError();
}
glGenTextures(1, &texColor);
glBindTexture(GL_TEXTURE_2D, texColor);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glCheckError();
if (createDepthStencilBuffer) {
glGenRenderbuffers(1, &rboDepthStencil);
glBindRenderbuffer(GL_RENDERBUFFER, rboDepthStencil);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
}
glGenFramebuffers(1, &fbo);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, texColor, 0);
if(createDepthStencilBuffer)
glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_STENCIL_ATTACHMENT, GL_RENDERBUFFER, rboDepthStencil);
glCheckError();
GLenum framebufferStatus = glCheckFramebufferStatus(GL_FRAMEBUFFER);
if (framebufferStatus != GL_FRAMEBUFFER_COMPLETE)
throw std::runtime_error("Failed to initialize framebuffer: " + std::to_string(framebufferStatus));
}
Framebuffer::~Framebuffer() {
if (rboDepthStencil)
glDeleteRenderbuffers(1, &rboDepthStencil);
if (texColor)
glDeleteTextures(1, &texColor);
glDeleteFramebuffers(1, &fbo);
}
void Framebuffer::Activate() {
glViewport(0, 0, width, height);
glBindFramebuffer(GL_FRAMEBUFFER, fbo);
}
void Framebuffer::RenderTo(Framebuffer &target) {
glBindFramebuffer(GL_FRAMEBUFFER, target.fbo);
glViewport(0, 0, target.width, target.height);
AssetManager::GetAsset<AssetShader>("/altcraft/shaders/fbo")->shader->Activate();
glBindVertexArray(quadVao);
glBindTexture(GL_TEXTURE_2D, texColor);
glDrawArrays(GL_TRIANGLES, 0, 6);
}
void Framebuffer::Resize(unsigned int newWidth, unsigned int newHeight) {
width = newWidth;
height = newHeight;
if (texColor) {
glBindTexture(GL_TEXTURE_2D, texColor);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, newWidth, newHeight, 0, GL_RGB, GL_UNSIGNED_BYTE, NULL);
}
if (rboDepthStencil) {
glBindRenderbuffer(GL_RENDERBUFFER, rboDepthStencil);
glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, width, height);
}
}
Framebuffer &Framebuffer::GetDefault()
{
static char fboDefaultData[sizeof(Framebuffer)];
static Framebuffer *fboDefault = nullptr;
if (fboDefault == nullptr) {
fboDefault = reinterpret_cast<Framebuffer*>(fboDefaultData);
fboDefault->fbo = 0;
fboDefault->width = 1;
fboDefault->height = 1;
fboDefault->texColor = 0;
fboDefault->rboDepthStencil = 0;
}
return *fboDefault;
}
void Framebuffer::Clear(bool color, bool depth, bool stencil)
{
Activate();
GLbitfield clearBits = 0;
if (color)
clearBits |= GL_COLOR_BUFFER_BIT;
if (depth)
clearBits |= GL_DEPTH_BUFFER_BIT;
if (stencil)
clearBits |= GL_STENCIL_BUFFER_BIT;
glClear(clearBits);
}
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