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#include "framebuffer.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 bind_texture(bool multisampled, uint32_t id)
{
glBindTexture(TextureTarget(multisampled), id);
}
static void CreateTextures(bool multisampled, uint32_t* out_id, uint32_t count)
{
// glCreateTextures is 4.5 DSA; macOS caps at 4.1. Callers bind each
// texture (with the correct target) before use.
glGenTextures(count, out_id);
}
static void AttachColorTexture(uint32_t id, int samples, GLenum internal_format, GLenum format, uint32_t width, uint32_t height, int index)
{
bool multisampled = samples > 1;
if (multisampled)
{
glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, samples, internal_format, width, height, GL_FALSE);
}
else
{
// Integer color formats require an integer pixel type even when
// data is null, or macOS's strict core profile rejects the call.
GLenum type = (format == GL_RED_INTEGER) ? GL_INT : GL_UNSIGNED_BYTE;
glTexImage2D(GL_TEXTURE_2D, 0, internal_format, width, height, 0, format, type, 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 attachment_type, 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 is 4.2; use mutable storage for macOS (4.1).
GLenum depth_format = (format == GL_DEPTH24_STENCIL8) ? GL_DEPTH_STENCIL : GL_DEPTH_COMPONENT;
GLenum depth_type = (format == GL_DEPTH24_STENCIL8) ? GL_UNSIGNED_INT_24_8 : GL_FLOAT;
glTexImage2D(GL_TEXTURE_2D, 0, format, width, height, 0, depth_format, depth_type, 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, attachment_type, 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;
}
}
Framebuffer::Framebuffer(const FramebufferSpecification& spec)
: m_specification(spec)
{
for (auto spec : m_specification.attachments.attachments)
{
if (!Utils::IsDepthFormat(spec.texture_format))
m_color_attachment_specifications.emplace_back(spec);
else
m_depth_attachment_specification = spec;
}
invalidate();
}
Framebuffer::~Framebuffer()
{
glDeleteFramebuffers(1, &m_renderer_id);
glDeleteTextures(static_cast<GLsizei>(m_color_attachments.size()), m_color_attachments.data());
glDeleteTextures(1, &m_depth_attachment);
}
auto Framebuffer::invalidate() -> void
{
if (m_renderer_id)
{
glDeleteFramebuffers(1, &m_renderer_id);
glDeleteTextures(static_cast<GLsizei>(m_color_attachments.size()), m_color_attachments.data());
glDeleteTextures(1, &m_depth_attachment);
m_color_attachments.clear();
m_depth_attachment = 0;
}
glGenFramebuffers(1, &m_renderer_id); // glCreateFramebuffers is 4.5 DSA; unavailable on macOS 4.1
glBindFramebuffer(GL_FRAMEBUFFER, m_renderer_id);
bool multisample = m_specification.Samples > 1;
if (m_color_attachment_specifications.size())
{
m_color_attachments.resize(m_color_attachment_specifications.size());
Utils::CreateTextures(multisample, m_color_attachments.data(), static_cast<uint32_t>(m_color_attachments.size()));
for (size_t i = 0; i < m_color_attachments.size(); i++)
{
Utils::bind_texture(multisample, m_color_attachments[i]);
switch (m_color_attachment_specifications[i].texture_format)
{
case FramebufferTextureFormat::RGBA8:
Utils::AttachColorTexture(m_color_attachments[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_color_attachments[i], m_specification.Samples, GL_R32I, GL_RED_INTEGER, m_specification.Width, m_specification.Height, static_cast<int>(i));
break;
}
}
}
if (m_depth_attachment_specification.texture_format != FramebufferTextureFormat::None)
{
Utils::CreateTextures(multisample, &m_depth_attachment, 1);
Utils::bind_texture(multisample, m_depth_attachment);
switch (m_depth_attachment_specification.texture_format)
{
case FramebufferTextureFormat::DEPTH24STENCIL8:
Utils::AttachDepthTexture(m_depth_attachment, m_specification.Samples, GL_DEPTH24_STENCIL8, GL_DEPTH_STENCIL_ATTACHMENT, m_specification.Width, m_specification.Height);
break;
}
}
if (m_color_attachments.size() > 1)
{
GLenum buffers[4] = { GL_COLOR_ATTACHMENT0, GL_COLOR_ATTACHMENT1, GL_COLOR_ATTACHMENT2, GL_COLOR_ATTACHMENT3 };
glDrawBuffers(static_cast<GLsizei>(m_color_attachments.size()), buffers);
}
else if (m_color_attachments.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);
}
auto Framebuffer::bind() -> void
{
glBindFramebuffer(GL_FRAMEBUFFER, m_renderer_id);
glViewport(0, 0, m_specification.Width, m_specification.Height);
}
auto Framebuffer::unbind() -> void
{
glBindFramebuffer(GL_FRAMEBUFFER, 0);
}
auto Framebuffer::resize(uint32_t width, uint32_t height) -> void
{
m_specification.Width = width;
m_specification.Height = height;
invalidate();
}
auto Framebuffer::read_pixel(uint32_t attachment_index, int x, int y) -> int
{
glReadBuffer(GL_COLOR_ATTACHMENT0 + attachment_index);
int pixel_data;
glReadPixels(x, y, 1, 1, GL_RED_INTEGER, GL_INT, &pixel_data);
return pixel_data;
}
auto Framebuffer::clear_attachment(uint32_t attachment_index, int value) -> void
{
// glClearTexImage is 4.4 and unavailable on macOS. clear the integer
// attachment by binding this framebuffer and clearing its draw buffer.
glBindFramebuffer(GL_FRAMEBUFFER, m_renderer_id);
glClearBufferiv(GL_COLOR, static_cast<GLint>(attachment_index), &value);
}
auto Framebuffer::create(const FramebufferSpecification& spec) -> Ref<Framebuffer>
{
return create_ref<Framebuffer>(spec);
}
};
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