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#include "OpenGLFramebuffer.h"
#include "Core/Log.h"
#include <glad/glad.h>
namespace Donut
{
namespace Utils
{
static GLenum TextureTarget(bool multisampled)
{
return multisampled ? GL_TEXTURE_2D_MULTISAMPLE : GL_TEXTURE_2D;
}
static void BindTexture(bool multisampled, uint32_t id)
{
glBindTexture(TextureTarget(multisampled), id);
}
static void CreateTextures(bool multisampled, uint32_t* outID, uint32_t count)
{
glCreateTextures(TextureTarget(multisampled), count, outID);
}
static void AttachColorTexture(uint32_t id, int samples, GLenum internalFormat, GLenum format, uint32_t width, uint32_t height, int index)
{
bool multisampled = samples > 1;
if (multisampled)
{
glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, samples, internalFormat, width, height, GL_FALSE);
}
else
{
glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, format, GL_UNSIGNED_BYTE, nullptr);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + index, TextureTarget(multisampled), id, 0);
}
static void AttachDepthTexture(uint32_t id, int samples, GLenum format, GLenum attachmentType, uint32_t width, uint32_t height)
{
bool multisampled = samples > 1;
if (multisampled)
{
glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, samples, format, width, height, GL_FALSE);
}
else
{
glTexStorage2D(GL_TEXTURE_2D, 1, format, width, height);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
}
glFramebufferTexture2D(GL_FRAMEBUFFER, attachmentType, TextureTarget(multisampled), id, 0);
}
static bool IsDepthFormat(FramebufferTextureFormat format)
{
switch (format)
{
case FramebufferTextureFormat::DEPTH24STENCIL8: return true;
}
return false;
}
static GLenum DonutFBTextureFormatToGL(FramebufferTextureFormat format)
{
switch (format)
{
case FramebufferTextureFormat::RGBA8: return GL_RGBA8;
case FramebufferTextureFormat::RED_INTEGER: return GL_RED_INTEGER;
}
return 0;
}
}
OpenGLFramebuffer::OpenGLFramebuffer(const FramebufferSpecification& spec)
: m_Specification(spec)
{
for (auto spec : m_Specification.Attachments.Attachments)
{
if (!Utils::IsDepthFormat(spec.TextureFormat))
m_ColorAttachmentSpecifications.emplace_back(spec);
else
m_DepthAttachmentSpecification = spec;
}
Invalidate();
}
OpenGLFramebuffer::~OpenGLFramebuffer()
{
glDeleteFramebuffers(1, &m_RendererID);
glDeleteTextures(static_cast<GLsizei>(m_ColorAttachments.size()), m_ColorAttachments.data());
glDeleteTextures(1, &m_DepthAttachment);
}
void OpenGLFramebuffer::Invalidate()
{
if (m_RendererID)
{
glDeleteFramebuffers(1, &m_RendererID);
glDeleteTextures(static_cast<GLsizei>(m_ColorAttachments.size()), m_ColorAttachments.data());
glDeleteTextures(1, &m_DepthAttachment);
m_ColorAttachments.clear();
m_DepthAttachment = 0;
}
glCreateFramebuffers(1, &m_RendererID);
glBindFramebuffer(GL_FRAMEBUFFER, m_RendererID);
bool multisample = m_Specification.Samples > 1;
// Attachments
if (m_ColorAttachmentSpecifications.size())
{
m_ColorAttachments.resize(m_ColorAttachmentSpecifications.size());
Utils::CreateTextures(multisample, m_ColorAttachments.data(), static_cast<uint32_t>(m_ColorAttachments.size()));
for (size_t i = 0; i < m_ColorAttachments.size(); i++)
{
Utils::BindTexture(multisample, m_ColorAttachments[i]);
switch (m_ColorAttachmentSpecifications[i].TextureFormat)
{
case FramebufferTextureFormat::RGBA8:
Utils::AttachColorTexture(m_ColorAttachments[i], m_Specification.Samples, GL_RGBA8, GL_RGBA, m_Specification.Width, m_Specification.Height, static_cast<int>(i));
break;
case FramebufferTextureFormat::RED_INTEGER:
Utils::AttachColorTexture(m_ColorAttachments[i], m_Specification.Samples, GL_R32I, GL_RED_INTEGER, m_Specification.Width, m_Specification.Height, static_cast<int>(i));
break;
}
}
}
if (m_DepthAttachmentSpecification.TextureFormat != FramebufferTextureFormat::None)
{
Utils::CreateTextures(multisample, &m_DepthAttachment, 1);
Utils::BindTexture(multisample, m_DepthAttachment);
switch (m_DepthAttachmentSpecification.TextureFormat)
{
case FramebufferTextureFormat::DEPTH24STENCIL8:
Utils::AttachDepthTexture(m_DepthAttachment, m_Specification.Samples, GL_DEPTH24_STENCIL8, GL_DEPTH_STENCIL_ATTACHMENT, m_Specification.Width, m_Specification.Height);
break;
}
}
if (m_ColorAttachments.size() > 1)
{
GLenum buffers[4] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3 };
glDrawBuffers(static_cast<GLsizei>(m_ColorAttachments.size()), buffers);
}
else if (m_ColorAttachments.empty())
glDrawBuffer(GL_NONE);
if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
{
GLenum status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
switch (status)
{
case GL_FRAMEBUFFER_UNDEFINED:
DONUT_ERROR("Framebuffer is undefined");
break;
case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
DONUT_ERROR("Framebuffer has incomplete attachment");
break;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
DONUT_ERROR("Framebuffer is missing attachment");
break;
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER:
DONUT_ERROR("Framebuffer has incomplete draw buffer");
break;
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER:
DONUT_ERROR("Framebuffer has incomplete read buffer");
break;
case GL_FRAMEBUFFER_UNSUPPORTED:
DONUT_ERROR("Framebuffer format is unsupported");
break;
case GL_FRAMEBUFFER_INCOMPLETE_MULTISAMPLE:
DONUT_ERROR("Framebuffer has incomplete multisample");
break;
case GL_FRAMEBUFFER_INCOMPLETE_LAYER_TARGETS:
DONUT_ERROR("Framebuffer has incomplete layer targets");
break;
default:
DONUT_ERROR("Framebuffer is incomplete (unknown error: {})", status);
break;
}
}
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void OpenGLFramebuffer::Bind()
{
glBindFramebuffer(GL_FRAMEBUFFER, m_RendererID);
glViewport(0, 0, m_Specification.Width, m_Specification.Height);
}
void OpenGLFramebuffer::Unbind()
{
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
void OpenGLFramebuffer::Resize(uint32_t width, uint32_t height)
{
m_Specification.Width = width;
m_Specification.Height = height;
Invalidate();
}
int OpenGLFramebuffer::ReadPixel(uint32_t attachmentIndex, int x, int y)
{
glReadBuffer(GL_COLOR_ATTACHMENT0 + attachmentIndex);
int pixelData;
glReadPixels(x, y, 1, 1, GL_RED_INTEGER, GL_INT, &pixelData);
return pixelData;
}
void OpenGLFramebuffer::ClearAttachment(uint32_t attachmentIndex, int value)
{
auto& spec = m_ColorAttachmentSpecifications[attachmentIndex];
glClearTexImage(m_ColorAttachments[attachmentIndex], 0,
Utils::DonutFBTextureFormatToGL(spec.TextureFormat), GL_INT, &value);
}
};
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