/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "GLcommon/FramebufferData.h"

#include "aemu/base/files/StreamSerializing.h"
#include "GLcommon/GLEScontext.h"
#include "GLcommon/GLutils.h"
#include "GLcommon/TextureData.h"

#include <GLES/gl.h>
#include <GLES/glext.h>

RenderbufferData::RenderbufferData(android::base::Stream* stream) :
    ObjectData(stream) {
    attachedFB = stream->getBe32();
    attachedPoint = stream->getBe32();
    // TODO: load eglImageGlobalTexObject
    width = stream->getBe32();
    height = stream->getBe32();
    internalformat = stream->getBe32();
    hostInternalFormat = stream->getBe32();
    everBound = stream->getBe32();
}

void RenderbufferData::onSave(android::base::Stream* stream, unsigned int globalName) const {
    ObjectData::onSave(stream, globalName);
    stream->putBe32(attachedFB);
    stream->putBe32(attachedPoint);
    // TODO: snapshot eglImageGlobalTexObject
    if (eglImageGlobalTexObject) {
        fprintf(stderr, "RenderbufferData::onSave: warning:"
                " EglImage snapshot unimplemented. \n");
    }
    stream->putBe32(width);
    stream->putBe32(height);
    stream->putBe32(internalformat);
    stream->putBe32(hostInternalFormat);
    stream->putBe32(everBound);
}

void RenderbufferData::restore(ObjectLocalName localName,
           const getGlobalName_t& getGlobalName) {
    ObjectData::restore(localName, getGlobalName);
    int globalName = getGlobalName(NamedObjectType::RENDERBUFFER,
            localName);
    GLDispatch& dispatcher = GLEScontext::dispatcher();
    dispatcher.glBindRenderbuffer(GL_RENDERBUFFER, globalName);
    if (hostInternalFormat != GL_NONE) {
        dispatcher.glRenderbufferStorage(GL_RENDERBUFFER, hostInternalFormat,
                                         width, height);
    }
}

void RenderbufferData::makeTextureDirty() {
    if (saveableTexture) {
        saveableTexture->makeDirty();
    }
}

static GLenum s_index2Attachment(int idx);

FramebufferData::FramebufferData(GLuint name, GLuint globalName) : ObjectData(FRAMEBUFFER_DATA)
        , m_fbName(name), m_fbGlobalName(globalName) {
}

FramebufferData::FramebufferData(android::base::Stream* stream) :
    ObjectData(stream) {
    m_fbName = stream->getBe32();
    int attachNum = stream->getBe32();
    (void)attachNum;
    assert(attachNum == MAX_ATTACH_POINTS);
    for (auto& attachPoint : m_attachPoints) {
        attachPoint.target = stream->getBe32();
        attachPoint.name = stream->getBe32();
        attachPoint.objType = (NamedObjectType)stream->getBe32();
        // attachPoint.obj will be set up in postLoad
        attachPoint.owned = stream->getByte();
    }
    m_dirty = stream->getByte();
    m_hasBeenBound = stream->getByte();
    m_hasDrawBuffers = stream->getByte();
    android::base::loadBuffer(stream, &m_drawBuffers);
    m_readBuffer = stream->getBe32();
}

FramebufferData::~FramebufferData() {
    for (int i=0; i<MAX_ATTACH_POINTS; i++) {
        detachObject(i);
    }
}

void FramebufferData::onSave(android::base::Stream* stream, unsigned int globalName) const {
    ObjectData::onSave(stream, globalName);
    stream->putBe32(m_fbName);
    stream->putBe32(MAX_ATTACH_POINTS);
    for (auto& attachPoint : m_attachPoints) {
        stream->putBe32(attachPoint.target);
        stream->putBe32(attachPoint.name);
        // do not save attachPoint.obj
        if (attachPoint.obj) {
            stream->putBe32((uint32_t)ObjectDataType2NamedObjectType(
                    attachPoint.obj->getDataType()));
        } else {
            stream->putBe32((uint32_t)NamedObjectType::NULLTYPE);
        }
        stream->putByte(attachPoint.owned);
    }
    stream->putByte(m_dirty);
    stream->putByte(m_hasBeenBound);
    stream->putByte(m_hasDrawBuffers);
    android::base::saveBuffer(stream, m_drawBuffers);
    stream->putBe32(m_readBuffer);
}

void FramebufferData::postLoad(const getObjDataPtr_t& getObjDataPtr) {
    for (auto& attachPoint : m_attachPoints) {
        if (NamedObjectType::NULLTYPE != attachPoint.objType) {
            attachPoint.obj = getObjDataPtr(attachPoint.objType,
                    attachPoint.name);
            if (!attachPoint.obj) {
                fprintf(stderr, "FramebufferData::postLoad: warning: "
                        "bound render buffer restore failed.\n");
                attachPoint.obj.reset(new RenderbufferData);
            }
        } else {
            attachPoint.obj = {};
        }
    }
}

void FramebufferData::restore(ObjectLocalName localName,
           const getGlobalName_t& getGlobalName) {
    ObjectData::restore(localName, getGlobalName);
    if (!hasBeenBoundAtLeastOnce()) return;
    int globalName = getGlobalName(NamedObjectType::FRAMEBUFFER,
            localName);
    GLDispatch& dispatcher = GLEScontext::dispatcher();
    dispatcher.glBindFramebuffer(GL_FRAMEBUFFER, globalName);
    for (int i = 0; i < MAX_ATTACH_POINTS; i++) {
        auto& attachPoint = m_attachPoints[i];
        if (!attachPoint.name) continue; // bound to nothing
        // attachPoint.owned is true only when color buffer 0 is
        // not bound. In such situation, it will generate its own object when
        // calling validate()
        if (attachPoint.owned) {
            attachPoint.name = 0;
            continue;
        }
        if (attachPoint.obj) { // binding a render buffer
            assert(attachPoint.obj->getDataType()
                    == RENDERBUFFER_DATA);
            attachPoint.globalName =
                getGlobalName(NamedObjectType::RENDERBUFFER,
                              attachPoint.name);
            RenderbufferData *rbData = (RenderbufferData*)attachPoint.obj.get();
            if (rbData->eglImageGlobalTexObject) {
                fprintf(stderr, "FramebufferData::restore: warning: "
                        "binding egl image unsupported\n");
            } else {
                assert(attachPoint.target == GL_RENDERBUFFER);
                dispatcher.glFramebufferRenderbuffer(
                        GL_FRAMEBUFFER,
                        s_index2Attachment(i),
                        attachPoint.target,
                        attachPoint.globalName);
            }
        } else { // binding a texture
            int texGlobalName = getGlobalName(NamedObjectType::TEXTURE,
                    attachPoint.name);
            attachPoint.globalName = texGlobalName;
            if (!texGlobalName) {
                fprintf(stderr, "FramebufferData::restore: warning: "
                        "a texture is deleted without unbinding FBO\n");
            }
            dispatcher.glFramebufferTexture2D(GL_FRAMEBUFFER,
                    s_index2Attachment(i),
                    attachPoint.target,
                    texGlobalName,
                    0);
        }
    }
    m_dirty = true;
    if (m_hasDrawBuffers) {
        dispatcher.glDrawBuffers(m_drawBuffers.size(), m_drawBuffers.data());
    }
    if (dispatcher.glReadBuffer) {
        dispatcher.glReadBuffer(m_readBuffer);
    }
}

void FramebufferData::makeTextureDirty(const getObjDataPtr_t& getObjDataPtr) {
    if (!hasBeenBoundAtLeastOnce()) return;
    for (int i = 0; i < MAX_ATTACH_POINTS; i++) {
        auto& attachPoint = m_attachPoints[i];
        if (!attachPoint.name || attachPoint.owned || attachPoint.obj) {
            // If not bound to a texture, do nothing
            continue;
        }
        TextureData* texData = (TextureData*)getObjDataPtr(
            NamedObjectType::TEXTURE, attachPoint.name).get();
        if (texData) {
            texData->makeDirty();
        }
    }
}

void FramebufferData::setAttachment(
               class GLEScontext* ctx,
               GLenum attachment,
               GLenum target,
               GLuint name,
               ObjectDataPtr obj,
               bool takeOwnership) {

    int idx = attachmentPointIndex(attachment);

    if (!name) {
        detachObject(idx);
        return;
    }
    if (m_attachPoints[idx].target != target ||
        m_attachPoints[idx].name != name ||
        m_attachPoints[idx].obj.get() != obj.get() ||
        m_attachPoints[idx].owned != takeOwnership) {
        detachObject(idx);

        m_attachPoints[idx].target = target;
        m_attachPoints[idx].name = name;

        NamedObjectType namedObjectType =
            target == GL_RENDERBUFFER ?
                NamedObjectType::RENDERBUFFER :
                NamedObjectType::TEXTURE;

        m_attachPoints[idx].globalName =
            name ? ctx->shareGroup()->getGlobalName(namedObjectType, name) : 0;

        m_attachPoints[idx].obj = obj;
        m_attachPoints[idx].owned = takeOwnership;

        if (target == GL_RENDERBUFFER_OES && obj.get() != NULL) {
            RenderbufferData *rbData = (RenderbufferData *)obj.get();
            rbData->attachedFB = m_fbName;
            rbData->attachedPoint = attachment;
        }

        m_dirty = true;

        refreshSeparateDepthStencilAttachmentState();
    }
}

GLuint FramebufferData::getAttachment(GLenum attachment,
                 GLenum *outTarget,
                 ObjectDataPtr *outObj) {
    int idx = attachmentPointIndex(attachment);
    if (outTarget) *outTarget = m_attachPoints[idx].target;
    if (outObj) *outObj = m_attachPoints[idx].obj;
    return m_attachPoints[idx].name;
}

GLint FramebufferData::getAttachmentSamples(GLEScontext* ctx, GLenum attachment) {
    int idx = attachmentPointIndex(attachment);

    // Don't expose own attachments.
    if (m_attachPoints[idx].owned) return 0;

    GLenum target = m_attachPoints[idx].target;
    GLuint name = m_attachPoints[idx].name;

    if (target == GL_RENDERBUFFER) {
        RenderbufferData* rbData = (RenderbufferData*)
            ctx->shareGroup()->getObjectData(NamedObjectType::RENDERBUFFER, name);
        return rbData ? rbData->samples : 0;
    } else {
        TextureData* texData = (TextureData*)
            ctx->shareGroup()->getObjectData(NamedObjectType::TEXTURE, name);
        return texData ? texData->samples : 0;
    }
}

void FramebufferData::getAttachmentDimensions(GLEScontext* ctx, GLenum attachment, GLint* width, GLint* height) {
    int idx = attachmentPointIndex(attachment);

    // Don't expose own attachments.
    if (m_attachPoints[idx].owned) return;

    GLenum target = m_attachPoints[idx].target;
    GLuint name = m_attachPoints[idx].name;

    if (target == GL_RENDERBUFFER) {
        RenderbufferData* rbData = (RenderbufferData*)
            ctx->shareGroup()->getObjectData(NamedObjectType::RENDERBUFFER, name);
        if (rbData) {
            *width = rbData->width;
            *height = rbData->height;
        }
    } else {
        TextureData* texData = (TextureData*)
            ctx->shareGroup()->getObjectData(NamedObjectType::TEXTURE, name);
        if (texData) {
            *width = texData->width;
            *height = texData->height;
        }
    }
}

GLint FramebufferData::getAttachmentInternalFormat(GLEScontext* ctx, GLenum attachment) {
    int idx = attachmentPointIndex(attachment);

    // Don't expose own attachments.
    if (m_attachPoints[idx].owned) return 0;

    GLenum target = m_attachPoints[idx].target;
    GLuint name = m_attachPoints[idx].name;

    if (target == GL_RENDERBUFFER) {
        RenderbufferData* rbData = (RenderbufferData*)
            ctx->shareGroup()->getObjectData(NamedObjectType::RENDERBUFFER, name);
        return rbData ? rbData->internalformat : 0;
    } else {
        TextureData* texData = (TextureData*)
            ctx->shareGroup()->getObjectData(NamedObjectType::TEXTURE, name);
        return texData? texData->internalFormat : 0;
    }
}

void FramebufferData::separateDepthStencilWorkaround(GLEScontext* ctx) {
    // Swiftshader does not need the workaround as it allows separate depth/stencil.
    if (isGles2Gles()) return;

    // bug: 78083376
    //
    // Some apps rely on using separate depth/stencil attachments with separate
    // backing images. This affects macOS OpenGL because it does not allow
    // separate depth/stencil attachments with separate backing images.
    //
    // Emulate them here with a single combined backing image.
#ifdef __APPLE__
    if (!m_hasSeparateDepthStencil || m_separateDSEmulationRbo) return;

    GLuint prevRboBinding;
    GLuint prevFboBinding;
    auto& gl = ctx->dispatcher();
    // Use the depth stencil's dimensions.
    GLint widthDepth;
    GLint heightDepth;
    getAttachmentDimensions(ctx, GL_DEPTH_ATTACHMENT,
                            &widthDepth, &heightDepth);

    gl.glGetIntegerv(GL_RENDERBUFFER_BINDING, (GLint*)&prevRboBinding);
    gl.glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, (GLint*)&prevFboBinding);

    gl.glGenRenderbuffers(1, &m_separateDSEmulationRbo);
    gl.glBindRenderbuffer(GL_RENDERBUFFER, m_separateDSEmulationRbo);
    gl.glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8,
                             widthDepth, heightDepth);

    gl.glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_fbGlobalName);
    gl.glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
                                 GL_RENDERBUFFER, m_separateDSEmulationRbo);
    gl.glFramebufferRenderbuffer(GL_DRAW_FRAMEBUFFER, GL_STENCIL_ATTACHMENT,
                                 GL_RENDERBUFFER, m_separateDSEmulationRbo);

    gl.glBindFramebuffer(GL_DRAW_FRAMEBUFFER, prevFboBinding);
    gl.glBindRenderbuffer(GL_RENDERBUFFER, prevRboBinding);
#endif
}

int FramebufferData::attachmentPointIndex(GLenum attachment)
{
    switch(attachment) {
    case GL_COLOR_ATTACHMENT0_OES:
        return 0;
    case GL_DEPTH_ATTACHMENT_OES:
        return 1;
    case GL_STENCIL_ATTACHMENT_OES:
        return 2;
    case GL_DEPTH_STENCIL_ATTACHMENT:
        return 3;
    default:
        {
            // for colorbuffer 1 ~ 15, they are continuous
            int idx = attachment - GL_COLOR_ATTACHMENT1 + 4;
            // in case for some new attachment extensions
            if (idx < 4 || idx > MAX_ATTACH_POINTS) {
                idx = MAX_ATTACH_POINTS;
            }
            return idx;
        }
    }
}

static GLenum s_index2Attachment(int idx) {
    switch (idx) {
    case 0:
        return GL_COLOR_ATTACHMENT0_OES;
    case 1:
        return GL_DEPTH_ATTACHMENT_OES;
    case 2:
        return GL_STENCIL_ATTACHMENT_OES;
    case 3:
        return GL_DEPTH_STENCIL_ATTACHMENT;
    default:
        return idx - 4 + GL_COLOR_ATTACHMENT1;
    }
}

void FramebufferData::detachObject(int idx) {
    if (m_attachPoints[idx].target == GL_RENDERBUFFER_OES && m_attachPoints[idx].obj.get() != NULL) {
        RenderbufferData *rbData = (RenderbufferData *)m_attachPoints[idx].obj.get();
        rbData->attachedFB = 0;
        rbData->attachedPoint = 0;
    }

    if(m_attachPoints[idx].owned)
    {
        switch(m_attachPoints[idx].target)
        {
        case GL_RENDERBUFFER_OES:
            GLEScontext::dispatcher().glDeleteRenderbuffers(1, &(m_attachPoints[idx].name));
            break;
        case GL_TEXTURE_2D:
            GLEScontext::dispatcher().glDeleteTextures(1, &(m_attachPoints[idx].name));
            break;
        }
    }

    m_attachPoints[idx] = {};

    refreshSeparateDepthStencilAttachmentState();
}

// bug: 78083376
//
// Check attachment state and delete / recreate original depth/stencil
// attachments if necessary.
//
void FramebufferData::refreshSeparateDepthStencilAttachmentState() {
    m_hasSeparateDepthStencil = false;

    ObjectDataPtr depthObject =
        m_attachPoints[attachmentPointIndex(GL_DEPTH_ATTACHMENT)].obj;
    ObjectDataPtr stencilObject =
        m_attachPoints[attachmentPointIndex(GL_STENCIL_ATTACHMENT)].obj;

    m_hasSeparateDepthStencil = depthObject && stencilObject && (depthObject != stencilObject);

    if (m_hasSeparateDepthStencil) return;

    // Delete the emulated RBO and restore the original
    // if we don't have separate depth/stencil anymore.
    auto& gl = GLEScontext::dispatcher();

    if (!m_separateDSEmulationRbo) return;

    gl.glDeleteRenderbuffers(1, &m_separateDSEmulationRbo);
    m_separateDSEmulationRbo = 0;

    // Now that we don't have separate depth/stencil attachments,
    // we might need to restore one of the original attachments,
    // because we were using a nonzero m_separateDSEmulationRbo.
    GLenum attachmentToRestore =
        m_attachPoints[attachmentPointIndex(GL_DEPTH_ATTACHMENT)].name ?
            GL_DEPTH_ATTACHMENT : (
                m_attachPoints[attachmentPointIndex(GL_STENCIL_ATTACHMENT)].name ?
                    GL_STENCIL_ATTACHMENT : 0);

    if (!attachmentToRestore) return;

    GLuint objectToRestore =
        m_attachPoints[attachmentPointIndex(attachmentToRestore)].globalName;

    GLenum objectTypeToRestore =
        m_attachPoints[attachmentPointIndex(attachmentToRestore)].target;

    GLuint prevFboBinding;
    gl.glGetIntegerv(GL_DRAW_FRAMEBUFFER_BINDING, (GLint*)&prevFboBinding);
    gl.glBindFramebuffer(GL_DRAW_FRAMEBUFFER, m_fbGlobalName);

    switch (objectTypeToRestore) {
    case GL_RENDERBUFFER:
        gl.glFramebufferRenderbuffer(
            GL_DRAW_FRAMEBUFFER,
            attachmentToRestore,
            GL_RENDERBUFFER,
            objectToRestore);
        break;
    case GL_TEXTURE_2D:
        gl.glFramebufferTexture2D(
            GL_DRAW_FRAMEBUFFER,
            attachmentToRestore,
            GL_TEXTURE_2D,
            objectToRestore, 0);
        break;
    }

    gl.glBindFramebuffer(GL_DRAW_FRAMEBUFFER, prevFboBinding);
}

void FramebufferData::validate(GLEScontext* ctx)
{
    // Do not validate if on another GLES2 backend
    if (isGles2Gles()) return;
    if(!getAttachment(GL_COLOR_ATTACHMENT0_OES, NULL, NULL))
    {
        // GLES does not require the framebuffer to have a color attachment.
        // OpenGL does. Therefore, if no color is attached, create a dummy
        // color texture and attach it.
        // This dummy color texture will is owned by the FramebufferObject,
        // and will be released by it when its object is detached.

        GLint type = GL_NONE;
        GLint name = 0;

        ctx->dispatcher().glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT_OES, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &type);
        if(type != GL_NONE)
        {
            ctx->dispatcher().glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT_OES, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &name);
        }
        else
        {
            ctx->dispatcher().glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT_OES, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE, &type);
            if(type != GL_NONE)
            {
                ctx->dispatcher().glGetFramebufferAttachmentParameteriv(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT_OES, GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME, &name);
            }
            else
            {
                // No color, depth or stencil attachments - do nothing
                return;
            }
        }

        // Find the existing attachment(s) dimensions
        GLint width = 0;
        GLint height = 0;

        if(type == GL_RENDERBUFFER)
        {
            GLint prev;
            ctx->dispatcher().glGetIntegerv(GL_RENDERBUFFER_BINDING, &prev);
            ctx->dispatcher().glBindRenderbuffer(GL_RENDERBUFFER, name);
            ctx->dispatcher().glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_WIDTH, &width);
            ctx->dispatcher().glGetRenderbufferParameteriv(GL_RENDERBUFFER, GL_RENDERBUFFER_HEIGHT, &height);
            ctx->dispatcher().glBindRenderbuffer(GL_RENDERBUFFER, prev);
        }
        else if(type == GL_TEXTURE)
        {
            GLint prev;
            ctx->dispatcher().glGetIntegerv(GL_TEXTURE_BINDING_2D, &prev);
            ctx->dispatcher().glBindTexture(GL_TEXTURE_2D, name);
            ctx->dispatcher().glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_WIDTH, &width);
            ctx->dispatcher().glGetTexLevelParameteriv(GL_TEXTURE_2D, 0, GL_TEXTURE_HEIGHT, &height);
            ctx->dispatcher().glBindTexture(GL_TEXTURE_2D, prev);
        }

        // Create the color attachment and attch it
        unsigned int tex = 0;
        ctx->dispatcher().glGenTextures(1, &tex);
        GLint prev;
        ctx->dispatcher().glGetIntegerv(GL_TEXTURE_BINDING_2D, &prev);
        ctx->dispatcher().glBindTexture(GL_TEXTURE_2D, tex);

        ctx->dispatcher().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST );
        ctx->dispatcher().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST );
        ctx->dispatcher().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE );
        ctx->dispatcher().glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE );
        ctx->dispatcher().glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);

        ctx->dispatcher().glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tex, 0);
        setAttachment(ctx, GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tex, ObjectDataPtr(), true);

        ctx->dispatcher().glBindTexture(GL_TEXTURE_2D, prev);
    }

    if(m_dirty)
    {
        // This is a workaround for a bug found in several OpenGL
        // drivers (e.g. ATI's) - after the framebuffer attachments
        // have changed, and before the next draw, unbind and rebind
        // the framebuffer to sort things out.
        ctx->dispatcher().glBindFramebuffer(GL_FRAMEBUFFER,0);
        ctx->dispatcher().glBindFramebuffer(
                GL_FRAMEBUFFER, m_fbGlobalName);

        m_dirty = false;
    }
}

void FramebufferData::setDrawBuffers(GLsizei n, const GLenum * bufs) {
    m_drawBuffers.resize(n);
    memcpy(m_drawBuffers.data(), bufs, n * sizeof(GLenum));
    m_hasDrawBuffers = true;
}

void FramebufferData::setReadBuffers(GLenum src) {
    m_readBuffer = src;
}